Wai Wa CHOI, Welsy蔡偉華
Associate Professor
GE Course Area Coordinator (Physical Science and the World) in CTLE

Academic Qualifications | Research Sojourn | Academic and Professional Working Experiences | Student Honors and Awards under Advisory | Professional Affiliations | University Teaching and Student Supervision | Research | Publications | Applied Research Achievements and Creative Works | Service to the University and the Wider Community | Contact Details


Academic Qualifications

2008   PhD Degree of Electrical and Electronics Engineering in University of Macau, Macao, China
Classification: Very Good with Honours and Distinction
Title of Thesis: Microwave Miniaturization Techniques and Theirs Applications to Quasi-Elliptic Bandpass Filters
1997   MSc Degree of Electrical and Electronics Engineering in University of Macau, Macao, China
Title of Thesis: Internet Facsimile Gateway
1993   BSc Degree of Electrical and Electronics Engineering in University of Macau, Macao, China

Research Sojourn

Aug. 1995
– Nov. 1993
  Center of Network Communication,
Institute of Systems and Computer Engineering
INESC-Lisbon, Lisbon, Portugal

Academic and Professional Working Experiences

Present
– Sep. 2009
  Assistant Professor
Department of Electrical and Computer Engineering
Faculty of Science and Technology
University of Macau, Macao, China
Aug. 2009
– Nov. 2008
  Senior Research Officer
Department of Electrical and Electronics Engineering
Faculty of Science and Technology
University of Macau, Macao, China
Oct. 2008
– Mar. 1996
  Research Assistant
Department of Electrical and Electronics Engineering
Faculty of Science and Technology
University of Macau, Macao, China

Aug. 2003
– Dec. 1995

  Research Assistant
(Under appointment of University Management Board of University of Macau)
Institute of Systems and Computer Engineering of Macau,  INESC-Macau, Macao, China

Student Honors and Awards under Advisory

2014   Chan Ka Heng and Cheang Chi Seng, Supervisor
Dean List Recipient of Faculty Science and Technology
2013   Chio Wai Lon and Zhang Yuzhe, Principal Supervisor
Dean List Recipient of Faculty Science and Technology
2012   Lo Wang Fu and Ho Kam Un, Co-Supervisor
Dean List Recipient of Faculty Science and Technology
2010   Li Yang, Supervisor
Best Student Paper Award of The 15th International Symposium on Antennas and Propagation (ISAP2010)
2010   Sam-Ngai Lam and Yao-Quan Qui, Principal Supervisor
Honorary Student Paper Award 2010 International Conference on Applications of Electromagnetism and Student Innovation Competition Awards
2002   Fok Si Weng, Co-Advisor
IEEE Microwave Theory and Techniques Society Undergraduate Scholarship
2001   Chiang Chun Pong, Co-Advisor
IEEE Microwave Theory and Techniques Society Undergraduate Scholarship Recipient

Professional Affiliations

2010 – Present   Senior Member of The Institute of Electrical and Electronics Engineers (IEEE)
2011 – Present   Member of The Institute of Electronics, Information and Communication Engineers (IEICE)
2009 – Present   Member of International Steering Committee of International Symposium on Antennas and Propagation (ISAP)
2014 – 2015   Chairman of IEEE Macau AP/MTT Joint Chapter
2013 – 2014   Vice-chairman of IEEE Macau AP/MTT Joint Chapter
2012 – 2013   Secretary of IEEE Macau AP/MTT Joint Chapter

University Teaching and Student Supervision

Teaching of Undergraduate (UG) and Postgraduate (PG) Courses

UG and PG Courses Taught in the Past 5 years
Academic Year/Semester Course Code Course Title Level
2009/2010 Fall ELEC222 Applied Electronics I UG
  Fall ELEC321 Applied Electronics III UG
  Fall IMSE013 Advanced Topics in Telecommunications PG/MSc
  Spring ELEC326 Control Electronics and Automation UG
  Spring ELEC482 Telecommunications Systems UG
2010/2011 Fall ELEC222 Applied Electronics I UG
  Spring IMSE013 Advanced Topics in Telecommunications PG/MSc
2011/2012 Fall ELEC222 Applied Electronics I UG
  Fall ELEC111 Electricity and Life UG/GE
  Spring ELEC111 Electricity and Life UG/GE
2012/2013 Fall ECEB221 Fundamental Electronics UG
  Fall IMSE006 Active Network Theory PG/MSc
  Spring ECEB221 Fundamental Electronics UG
  Spring ECEB360 RF & MW Techniques for Wireless Systems UG
  Spring ELEC111 Electricity and Life UG/GE
2013/2014 Fall IMSE006 Active Network Theory PG/MSc
  Fall ELEC111 Electricity and Life UG/GE
  Spring ELEC111 Electricity and Life UG/GE

Postgraduate Student Supervisions

From 2009 till now, 3 master students were graduated under his supervision. Among of them, 1 master graduate was awarded best student paper prize in an international conference.

PhD Student Supervisions in Progress

Year   Student Name, Role
Feb. 2015   Liu Neng Wu, Principal-Supervisor
Topic: Microwave Tunable Components
Jan. 2013   Yang Li, Co-Supervisor
Topic: Transmission Line Transition in Multi-layer Circuit and Its Applications

MSc Graduates

Year   Student Name, Role
Mar. 2014   Zhuang Wen Yao, Supervisor
Thesis Title: Design of a Novel Beam Steering Network based on Butler Matrix
Jan. 2013   Yang Li, Supervisor
Thesis Title: Design of Integrated Differential Dual-Band Bandpass Filter-Antenna Module
Mar. 2011   Leong Chon Chio, Co-Supervisor
Thesis Title: Tunable Defected Ground Structure and Its Applications to Simultaneous Reconfigurable Communication and Partial Discharge Detection

MSc Student Supervisions in Progress

Year   Student Name, Role
Sep. 2013   Yang Jie, Supervisor
Sep. 2013   Teng Cheng, Co-Supervisor

BSc Final Year Project Supervisions

Dr. Choi has supervised and co-supervised 7 BSc graduate designs and 3 of them were awarded the honors of “FST Dean List” in 2012 – 2014.

Year

 

Student Name, Role

2014

 

Chan Ka Heng and Cheang Chi Seng, Supervisor
Thesis Title:    Platform for Wireless Sensor Network (FST Dean List Recipients)

2014

 

Xu Ziqu, Supervisor
Thesis Title:    A Fundamental FMCW Radar

2013

 

Chio Wai Lon and Zhang Yuzhe, Principal-Supervisor
Thesis Title:    Partial Discharge Signal Detection and Analyze (FST Dean List Recipients)

2013

 

Guo Zengbin, Supervisor
Thesis Title:    A Compact UHF RFID Reader Design and Its Mobile Platform Applications

2012

 

Lo Wang Fu and Ho Kam Un, Co-Supervisor
Thesis Title:    A Non-Destructive Detection of Partial Discharge on Power Cable
(FST Dean List Recipients)

2012

 

Chong Seak and Sou Iek Iam, Co-Supervisor
Thesis Title:    Wireless Partial Discharge Monitoring System for High Voltage Facilities

2010

 

Qui Yao Quan and Lam Sam Ngai, Principal Supervisor
Thesis Title:    RFID Based Multi-sensing Platform for Partial Discharge Detection

2003

 

Fok Si Weng and Hong Sio Ian, Co-Supervisor
Thesis Title:    Intelligent Remote Metering System

2002

 

Chiang Chun Pong and Lei Ka Pou, Co-Supervisor
Thesis Title:    Wireless Multimedia Field Management System

2001

 

Sin Sai Weng and Lai Keng Chong, Co-Supervisor
Thesis Title:    Linearization Technique of CMOS MMIC Power Amplifier

2000

 

Leung Wai Chong and Kuan Man Chao, Co-Supervisor
Thesis Title:    New Prototype of the Detecting Module for Improving the P.O. Box Automation System

Curriculum Development and General Education Teaching

From 2009 to 2011, Dr. Choi has joined the GE Course Development Team of Physical Science and The World Area (Area 6) as a member and contributed to the course development. The area courses aim to prepare the undergraduate students will not only acquire academic knowledge but also be stimulated to think about the relationship between science, human society and their impact to the modern society development. Since 2012, Dr. Choi has been nominated as the GE Course Area Coordinator of Area 6 (Physical Science and the World) by the Centre for Teaching and Learning Enhancement to University so as to support the management of all 4 courses in Area 6.


Research

Research Interests

Dr. Choi’s research highlight is about tunable microwave filter and UWB (Ultra-Wide Band) differential filter that are important front-end component for modern compact multi-functional portable devices.

External Research Grant (PI)

Period   Project
Dec. 2017
– Jan. 2014
  Multi-Beam, Multi-Band, Multi-Function Radar Systems
Funded by Macao Science and Technology Development Fund
May 2013
– Sep. 2009
  Multi-layer Multi-conductor Transmission Line and its Applications to Differential Microwave Circuits
Funded by Macao Science and Technology Development Fund

Internal Research Grant (PI)

Period   Project
2017
– 2014
  Study of RF/MW Tunable Components for Cognitive Radio
Funded by Research Committee of University of Macau
2010
– 2009
  Miniaturization Techniques for Microwave Tunable Circuits
Funded by Research Committee of University of Macau

Publications

In the period under review from 2009 to 2014, 2 research projects had been completed; 11 international journal papers and 15 conference papers had been published. According to the Journal Citation Reports (JCR), 9 of 11 journal papers were published in Q1 rank including prestigious IEEE periodicals like IEEE Transactions on Microwave Theory and Techniques; IEEE Microwave and Wireless Components Letters; IEEE Transactions on Antennas and Propagation and IEEE Antennas and Wireless Propagation Letters. 4 conference papers were published in Top 3 International Conferences of the field including IEEE International Microwave Symposium; European Microwave Conference and Asia Pacific Microwave Conference. The citation index is 139 for all my publications since 2009 while the total citation is 163 with h-index as 6.

Summary of Journal Papers in Review Period 2009 – 2014 (Web of Science)
Journal Ranking from JCR Q1 Q2 Q3 Q4
Number of Papers 9 0 1 1

International Journal Papers

1.

 

Li Yang, Lei Zhu, Runqi Zhang, Jianpeng Wang, Wai-Wa Choi, Kam-Weng Tam and Roberto Gómez-García, “Novel multilayered ultra-broadband bandpass filters on high-impedance slotline resonators,”  IEEE Trans. Microw. Theory Tech. vol. 67 no. 1, pp. 129-139, January 2019.

2.

 

Neng-Wu Liu, Lei Zhu, Wai-Wa Choi and Guang Fu, “A low-profile wideband aperture-fed microstrip antenna with improved radiation patterns,” IEEE Trans. Antennas Propag. October 2018.

3.

 

Li Yang, Lei Zhu, Wai-Wa Choi, Kam-Weng Tam, Runqi Zhang and Jianpeng Wang, “Wideband balanced-to-unbalanced bandpass filters synthetically designed with Chebyshev filtering response,” IEEE Trans. Microw. Theory Tech. vol. 66 no. 10, pp. 4528-4539, October 2018.

4.

 

Xuedao Wang*, Jianpeng Wang, Wai-Wa Choi, Li Yang and Wen Wu, “Dual-wideband filtering power divider based on coupled stepped-impedance resonators,” IEEE Microw. Wireless Comp. Letts., vol. 28, no. 10, pp. 873-875, October 2018.

5.

 

Huan Huan Zhang, Zhong Chao Lin, Wei E. I. Sha, Wai Wa Choi, Kam Weng Tam, Daniel Garcia Donoro and Guangming Shi, “Electromagnetic-thermal analysis of human head exposed to cell phones with the consideration of radiative cooling,” IEEE Antennas Wireless Propag. Lett., vol. 17, pp. 1584-1587, September, 2018.

6.

 

Neng-Wu Liu, Lei Zhu, Wai-Wa Choi and Xiao Zhang, “A low-profile differential-fed patch antenna with bandwidth enhancement and sidelobe reduction under operation of TM10 and TM12 modes,” IEEE Trans. Antennas Propag. vol. 66 no. 9, pp. 4854-4859, September 2018.

7.

 

Neng-Wu Liu, Lei Zhu, Wai-Wa Choi and Jin-Dong Zhang, “A low-profile differentially fed microstrip patch antenna with broad impedance bandwidth under triple-mode resonance,” IEEE Antennas Wireless Propag. Lett., vol. 17, pp. 1478-1482, August, 2018.

8.

 

Li Yang, Lei Zhu, Wai-Wa Choi, Kam-Weng Tam and Runqi Zhang, “Compact wideband microstrip-to-microstrip vertical transition with extended upper stopband,” International Journal of RF and Microwave Computer-Aided Engineering, vol. 28 no. 4, pp. May 2018.

9.

 

Neng-Wu Liu, Lei Zhu and Wai-Wa Choi, “A low-profile wide-bandwidth planar inverted-F antenna under dual resonances: principle and design approach,” IEEE Trans. Antennas Propag. vol. 65, no. 10, pp. 5019-5025, October 2017.

10.

 

Neng-Wu Liu, Lei Zhu, Xiao Zhang and Wai-Wa Choi, “A Wideband differential-fed dual-polarized microstrip antenna under radiation of dual improved odd-order resonant modes,” IEEE Access, vol.5, pp. 23672-23680, November 2017.

11.

 

Li Yang, Lei Zhu, Wai-Wa Choi and Kam-Weng Tam, “Analysis and design of wideband microstrip-to-microstrip equal ripple vertical transitions and their application to bandpass filters,” IEEE Trans. Microw. Theory Tech. vol. 65 no. 8, pp. 2866-2877, August 2017.

12.

 

Neng-Wu Liu, Lei Zhu, Wai-Wa Choi and Xiao Zhang, “Wideband shorted patch antenna under radiation of dual-resonant modes,” IEEE Trans. Antennas Propag. vol. 65 no. 6, pp. 2789-2796, June 2017.

13.

 

Li Yang, Lei Zhu, Wai-Wa Choi, Kam-Weng Tam, Runqi Zhang and Jianpeng Wang, “Wideband microstrip-to-microstrip vertical transition with high filtering selectivity using open-circuited slotline SIR,” IEEE Microw. Wireless Comp. Letts., vol. 27, no. 4, pp. 329-331, April 2017.

14.

 

Neng-Wu Liu, Lei Zhu and Wai-Wa Choi, “A differential-fed microstrip patch antenna with bandwidth enhancement under operation of TM10 and TM30 modes,” IEEE Trans. Antennas Propag. vol. 65, no. 4, pp. 1607-1614, April 2017.

15.

 

Neng-Wu Liu, Lei Zhu, Wai-Wa Choi and Xiao Zhang, “A low-profile aperture-coupled microstrip antenna with enhanced bandwidth under dual resonance,” IEEE Trans. Antennas Propag. vol. 65, no.3, pp.1055-1062, March 2017.

16.

 

Li Yang, Wai-Wa Choi, Kam-Weng Tam and Lei Zhu, “Novel wideband bandpass filter with dual notched bands using stub-loaded resonators,” IEEE Microw. Wireless Comp. Letts., vol. 27, no. 1, pp. 25-27, January 2017.

17.

 

Chong Fan, Wai-Wa Choi, Wanchen Yang, Wenquan Che and Kam-Weng Tam, “A low cross-polarization reflectarray antenna based on SIW slot antenna,” IEEE Antennas Wireless Propag. Lett., vol. 16, pp. 333-336, 2017.

18.

 

Yang Xiong, Cheng Teng, Ming He, Kam-Weng Tam, Xian Yu, Wai-Wa Choi and Hai Hua Chen, “Using intrinsic zero to notch satellite signals in UWB filter,” Int. J. Microw. Wireless Technol. vol. 9, no. 5, pp. 1009-1015, November 2016.

19.

 

Neng-Wu Liu*, Lei Zhu and Wai-Wa Choi, “A printed wide-beamwidth circularly polarized antenna via two pairs of radiating slots placed in a square contour,” Int. J. Microw. Wireless Technol. vol. 9, no. 3, pp. 649-656, August 2016.

20.

 

Neng-Wu Liu*, Lei Zhu, Wai-Wa Choi, Jin-Dong Zhang, “A novel differential-fed patch antenna on stepped-impedance resonator with enhanced bandwidth under dual-resonance,” IEEE Trans. Antennas Propag.,vol. 64, no. 11, pp. 4618-4625, November 2016.

21.

 

Neng-Wu Liu*, Lei Zhu and Wai-Wa Choi, “Low-profile wide-beamwidth circularly-polarised patch antenna on a suspended substrate,” IET Microw. Antennas Propag., vol. 10, no. 8, pp. 885-890, May 2016.

22.

 

Li Yang*, Lei Zhu, Wai-Wa Choi and Kam-Weng Tam, “Vertical microstrip-to-microstrip transition through the highpass-filter topology for ultra-wideband (UWB) applications,” Transactions Hong Kong Institution of Engineers, vol. 23, no. 1, pp. 19-25, March 2016.

23.

 

Li Yang*, Lei Zhu, Wai-Wa Choi and Kam-Weng Tam, “Wideband vertical microstrip-to-microstrip transition with three-pole filtering response,” Microwave and Optical Technology Lett., vol. 57, no. 9, pp. 2213-2216, September 2015.

24.

 

Li Yang*, Wai-Wa Choi, Kam-Weng Tam and Lei Zhu, “Balanced dual-band bandpass filter with multiple transmission zeros using doubly short-ended resonator coupled line,” IEEE Trans. Microw. Theory Tech.,vol. 63, no. 7, pp. 2225-2232, July 2015.

25.

 

Hui Wang*, Kam-Weng Tam, Wai-Wa Choi, Wen-Yao Zhuang*, Sut-Kam Ho, Wei Kang and Wen Wu, “Analysis of coupled cross-shaped resonator and its application to differential bandpass filters design,” IEEE Trans. Microw. Theory Tech. vol. 63, no. 1, January 2015.

26.

 

Pedro Cheong, Ka-Fai Chang, Wai-Wa Choi, and Kam-Weng Tam “A highly integrated antenna-triplexer with simultaneous three-port isolations based on multi-mode excitation,” IEEE Trans. Antennas Propag. vol. 63, no. 1, pp 363-368, January, 2015.

27.

 

Wanchen Yang*, Kam-Weng Tam, Wai-Wa Choi, Wenquan Che and Hon-Tat Hui, “Novel polarization rotation technique based on an artificial magnetic conductor and its application in a low-profile circular polarization antenna,” IEEE Trans. Antennas Propag. vol. 62, no. 10, 2014.

28.

 

Wanchen Yang*, Kam-Weng Tam, Wai-Wa Choi, Wenquan Che and Hon Tat Hui, “Novel polarization rotation reflective surface based on an artificial magnetic conductor and its application,” Electron. Lett. vol. 50, no. 21, pp. 1500 – 1502, October 2014.

29.

 

Pedro Cheong, Ke Wu, Wai-Wa Choi and Kam-Weng Tam “Yagi-Uda antenna for multiband radar applications,” IEEE Antennas Wireless Propag. Lett., vol. 13, pp. 1065-1068, 2014.

30.

 

Wai-Wa Choi, Ka-Fai Chang, Chon-Chio Leong, Pedro Cheong and Kam-Weng Tam, “Design and analysis of defected ground structure transformer for dual-band antenna,” IET The Journal of Engineering vol. 2014 no.11., pp.612-617, November 2014.

31.

 

Jin-Rong Mao*, Wai-Wa Choi, Kam-Weng Tam, Wenquan Che and Quan Xue, “Tunable bandpass filter design based on external quality factor tuning and multiple mode resonators for wideband applications,” IEEE Trans. Microw. Theory Tech., vol. 61, no. 7, pp. 2574 – 2584, July 2013.

32.

 

Suyang Shi*, Wai-Wa Choi, Wenquan Che, Kam-Weng Tam, and Quan Xue, “Ultra-wideband differential bandpass filter with narrow notched band and improved common-mode suppression by DGS,” IEEE Microw. Wireless Comp. Letts., vol. 22, no. 4, pp. 185–187, April 2012.

33.

 

Wai-Wa Choi, “Special section on recent progress in antennas and propagation conjunction with main topics of ISAP2010 Forward”, The IEICE Trans. of Communications, vol. E95-B no.1, January 2012.

34.

 

Li Yang*, Pedro Cheong, Liang Han, Wai-Wa Choi, Kam-Weng Tam and Ke Wu “Miniaturized parallel coupled-line filter-antenna with spurious response suppression,” IEEE Antennas Wireless Propag. Lett., vol. 10, pp. 726 – 729, 2011.

35.

 

Pedro Cheong, Ting-Shan Lv, Wai-Wa Choi and Kam-Weng Tam, “A compact microstrip square-loop dual-mode balun-bandpass filter with simultaneous spurious response suppression and differential performance improvement,” IEEE Microw. Wireless Compon. Lett. vol. 21, pp. 77 – 79, February 2011.

36.

 

Xiao-Hua Wang, Quan Xue and Wai-Wa Choi, “A novel ultra-wideband differential filter based on double-sided parallel-strip line,” IEEE Microw. Wireless Compon. Lett. vol. 20, pp. 471 – 473, August 2010.

37.

 

Wai-Wa Choi, Kam-Weng Tam and R. P. Martins, “Spurious suppressed microstrip bandpass filter with two transmission zeros,” Microwave and Optical Technology Lett., vol. 48, pp. 1979-1981, October 2006.

38.

 

Wai-Wa Choi, Kam-Weng Tam and R. P. Martins, “Design of microwave lumped and transversal bandpass filter with noise reduction,” Microwave and Optical Technology Lett., vol. 48, pp. 1161-1164, June 2006.

International Conference Papers

1.

 

Meng-Ting Tu*, Wai-Wa Choi and Pedro Cheong, “Defected Ground Structure of UWB Chipless RFID Tag for FMCW Radar,” in Proc. 2018 IEEE International Conference on RFID Technology & Application (RFID-TA 2018), September, 2018

3.

 

Teng Cheng, Li-Kang Wang, Pedro Cheong, Sut-Kam Ho, Wai-Wa Choi, Guang-Hua Yang and Kam-Weng Tam, “Design of UWB chipless RFID tag using microstrip and slot cross-shaped resonators,” in Proc. 2018 International Flexible Electronics Technology Conference (IFETC 2018), Otawa, Canda,August 2018.

3.

 

Li Yang, Lei Zhu, Wai-Wa Choi and Kam-Weng Tam, “Novel Microstrip-to-Microstrip Vertical Transition Designed with Slotline Stepped-Impedance Resonator,” in Proc. 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT2018), Chengdu, China, May 2018.

4.

 

Li-Kang Wang, Kam-Weng Tam and Wai-Wa Choi, “A UWB filter with tunable notch using microstrip/slotline structure with T-slot stub,” in Proc. 2016 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB2016), Nanjing, China, October 16-19, 2016.

5.

 

Meng-Yang Ni, Kam-Weng Tam and Wai-Wa Choi, “A novel wideband bandpass filter using cross-shaped slotline structure,” in Proc. 2016 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB2016), Nanjing, China, October 16-19, 2016.

6.

 

Li Yang, Lei Zhu, Wai-Wa Choi and Kam-Weng Tam, “Wideband vertical microstrip-to-microstrip transition designed with cross-coupled microstrip/slotline resonators,” in Proc. 2015 Asia-Pacific Microwave Conference (APMC2015), vol. 2, Nanjing, China, December 6-9, 2015.

7.

 

Jie Yang, Wai-Wa Choi and Kam-Weng Tam, “A novel dual-band frequency tunable slot antenna with constant frequency ratio,” in Proc. 2015 Asia-Pacific Microwave Conference (APMC2015), vol. 2, Nanjing, China, December 6-9, 2015.

8.

 

Teng Cheng, Kam-Weng Tam and Wai-Wa Choi, “Design of wideband bandpass filter with reconfigurable bandwidth using cross-shaped resonator,” in Proc. 2015 Asia-Pacific Microwave Conference (APMC2015), vol. 2, Nanjing, China, December 6-9, 2015.

9.

 

Li Yang, Wai-Wa Choi and Kam-Weng Tam, “Compact ultra-wideband balun filter and its quasi-Yagi antenna application,” in Proc. The 20th International Symposium on Antennas and Propagation (ISAP2015), Hobart, Tasmania, Australia, November 9 – 12, 2015.

10.

 

Marcin Goralczyk, Teng Cheng, Kam-Weng Tam, Wai-Wa Choi, Wojciech Wojtasiak and Jozef Modelski, “Design of ultra-wideband bandpass filter with two reconfigurable notches using terminated cross-shaped resonator,” in Proc. 2015 IEEE Region 10 Conference (TENCON2016), Macao, China, November 1-4, 2015.

11.

 

Jie Yang and Wai-Wa Choi, “Frequency-agile slot antenna using capacitive loaded parallel strips,” in Proc. 2015 IEEE Region 10 Conference (TENCON2016), Macao, China, November 1-4, 2015.

12.

 

Dawid Lukasz Kuchta, Teng Cheng, Kam-Weng Tam, Wai-Wa Choi, Wojciech Wojtasiak and Jozef Modelski, “Design of dual-band bandpass filters using cross-shaped resonator and spurline,” in Proc. 2015 IEEE Region 10 Conference (TENCON2016), Macao, China, November 1-4, 2015.

13.

 

Jie Yang, Wai-Wa Choi and Kam-Weng Tam, “Discussion of conversion theory between mixed-mode S-parameters and T-parameters for differential circuit with and without common-mode suppression,” in Proc. 2015 IEEE International Conference of Computational Electromagnetics (ICCEM2015), Hong Kong, China, February 2-5, 2015.

14.

 

Ka-Heng Chan#, Chi-Seng Cheang# and Wai-Wa Choi, “ZigBee wireless sensor network for surface drainage monitoring and flood prediction,” in Proc. The 19th International Symposium on Antennas and Propagation (ISAP2014), Kaohsiung, Taiwan, December 2 – 5, 2014.

15.

 

Wanchen Yang*, Wenquan Che, Wai-Wa Choi and Kam-Weng Tam, “A low-profile circularly polarized dipole antenna using a novel polarization rotation artificial magnetic conductor,” will appear in Proc. The 44th European Microwave Conference 2014 (EuMC2014), Fiera di Roma, Rome, Italy, October 2014.

16.

 

Jin-Rong Mao*, Wenquan Che, Wai-Wa Choi, Kam-Weng Tam and Quan Xue, “Fully tunable filter design using tunable transformers and multiple mode resonators,” in IEEE MTT-S Int. Wireless Symp. Dig. (IWS2013), April 2013, pp. 1–3.

17.

 

Yuzhe Zhang#, Wai-Lon Chio#, Wen-Yao Zhuang*, Wai-Wa Choi and Kam-Weng Tam, “Size reduction of microstrip crossover using defected ground structure and its application in butler matrix,” in Proc. 2013 IEEE International Workshop on Electromagnetics (iWEM2013), 1 – 3 August 2013, vol. 1, pp. 100 – 103, Hong Kong, China.

18.

 

Suyang Shi*, Wai-Wa Choi, Kam-Weng Tam, Wenquan Che, and Quan Xue, “Differential UWB power-distribution network with equal power ratio and out-of-phase single-ended outputs,” IEEE MTT-S Int. Microw. Symp. Dig., 2012, vol. 1.

19.

 

Li Yang*, Wai-Wa Choi and Kam-Weng Tam, “Differential microstrip bandpass filter with dual-band responses using parallel-coupled line structure,” in Proc. 2012 Asia Pacific Microwave Conference (APMC 2012), vol. 1 pp. 28-30, Kaohsiung, Taiwan, December 4-7, 2012.

20.

 

Li Yang, CH Ng, Wai-Wa Choi and Kam-Weng Tam, “Planar miniature dual-band RFID/WlFi antenna for postal application,” in Proc. The 17th Int. Symp. Antenna and Propagation (ISAP2012), pp. 1252-1255, 29 October – 2 November 2012, Nagoya, Japan.

21.

 

Chon-Chio Leong, Kai-Fa Chang, Wai-Wa Choi and Kam-Weng Tam, “Tunable defected ground structure and its applications to simultaneous reconfigurable communication and partial discharge detection,” in Proc. The 2012 IEEE International Conference on Antenna and Propagation (APCAP2012), pp. 159-160, 27-29 October August 2012, Singapore.

22.

 

Wen-Yao Zhuang*, Pedro Cheong, Wai-Wa Choi and Kam-Weng Tam, “Novel filter-antenna using slot antenna and centrally loaded coupled line structure,” in Proc. The 16th Int. Symp. Antenna and Propagation (ISAP2011), 25 – 28 October 2011, Jeju, Korea.

23.

 

Chon Chio Leong*, Wai-Wa Choi and Kam-Weng Tam, “A tunable dual-band DGS stub tapped branch-line coupler,” in Proc. 2010 Asia-Pacific Microwave Conference (APMC2010), December 2010, pp. 1252-1255. Yokohama, Japan.

24.

 

Li Yang*, Pedro Cheong, Wai-Wa Choi and Kam-Weng Tam, “A three-port integrated dual band filter-antenna module,” in Proc. The 15th Int. Symp. Antenna and Propagation (ISAP2010), November 2010, pp. 1029-1032, Macao SAR, China.

25.

 

Wen-Yao Zhuang*, Pedro Cheong, Wai-Wa Choi and Kam-Weng Tam, “An integrated open-loop resonator bandpass filter-slot antenna with stopband improvement,” in Proc. The 15th Int. Symp. Antenna and Propagation (ISAP2010), November 2010, pp. 1033-1036, Macao SAR, China.

26.

 

Bin-Kai Ou, Daniel Piscarreta, Pedro Cheong, Wai-Wa Choi and Kam-Weng Tam, “Open-loop stub-loaded dual-band resonator for solution sensing,” in Proc. The 15th Int. Symp. Antenna and Propagation (ISAP2010), November 2010, pp. 836-839, Macao SAR, China.

27.

 

Pedro Cheong, Sam-Ngai Lam#, Yao-Quan Qui#, Wai-Wa Choi and Kam-Weng Tam, “A tunable antenna-filter module for simultaneous UHF RFID-based power facility monitoring and partial discharge measurement,” in Proc. Int. Conf. Applications of Electromagnetism and Student Innovation Competition Awards, August. 2010, pp. 182-186, Taipei, Taiwan.

29.

 

K. K. Sun, Ting-Shan Lv, Kam-Weng Tam and Wai-Wa Choi, “A miniaturized dual-mode bandpass filter with spurious response suppression and its balun-bandpass extension,” in Proc. Cross Strait Tri-Regional Radio Science and Wireless Technology Conference (CSTRWC2009), August 2009, pp. 93. Tianjin, China.

30.

 

Chon Chio Leong*, Wai-Wa Choi and Kam-Weng Tam, “A tunable monopole antenna using double U-shaped defected ground structure with islands,” in Proc. The 14th Int. Symp. Antenna and Propagation (ISAP2009), Bangkok, Thailand, October 2009, pp. 783-786.

31.

 

Chon Chio Leong*, Wai-Wa Choi and Kam-Weng Tam, “Tunable bandstop element using double U-shaped defected ground structure with islands,” in Proc. Cross Strait Tri-Regional Radio Science and Wireless Technology Conference 2009 (CSTRWC 2009), Tianjin, China, 23 – 25 Aug. 2009.

32.

 

Wai-Wa Choi and Kam-Weng Tam, “A novel compact microstrip dual-band bandpass filter based on transversal filter structure and centrally loaded resonator with independent control of passbands,” in Proc. 2008 Asia-Pacific Microwave Conference (APMC2008), Hong Kong, China, December 2008, pp. 783-786.

33.

 

Wai-Wa Choi and Kam-Weng Tam, “A microstrip SIR dual-mode bandpass filter with simultaneous size reduction and spurious responses suppression,” in Proc. IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components, Chengdu, China. December 2008, pp. 116-119.

34.

 

K. M. Ho, H. K. Pang, Wai-Wa Choi and Kam-Weng Tam, “Design of compact microstrip resonator filter with projective DGS,” in Proc. Cross Strait Tri-Regional Radio Science and Wireless Technology Conference (CSTRWC2006), Macao, China, August 2006, pp 120-122.

35.

 

Wai-Wa Choi, Kam-Weng Tam and R. P. Martins, “A compact microstrip transversal bandpass filter using grounded l/4 resonator with capacitive stub,” in Proc. Microwave and Millimeter-wave Symposium of China, Shenzhen, China, February 2006, pp. 582-585.

36.

 

Wai-Wa Choi, Kam-Weng Tam and R. P. Martins, “A novel microstrip transversal bandpass filter with simultaneous size reduction and spurious responses suppression,” in Proc. 2005 Asia-Pacific Microwave Conference (APMC2005), Suzhou, China, 4 – 7 December 2005 pp. 508-511.

37.

 

Wai-Wa Choi, Kam-Weng Tam and R. P. Martins, “Improvement of gain compression in microwave lumped and transversal bandpass filters,” in IEEE MTT-S Int. Microwave Symp. Dig., Jun. 2005, Long Beach, USA, pp. 2171-2174.

38.

 

S. I. Hong, S. W. Fok, Wai-Wa Choi, Kam-Weng Tam and R. P. Martins, “A novel wiggly-line hairpin filter with 2nd spurious passband suppression,” in Proc. The 34th European Microwave Conference (EuMC2004), Amsterdam, Netherlands, October, 2004, pp. 1125-1128.

39.

 

Wai-Wa Choi, Kam-Weng Tam and R. P. Martins, “Microwave lumped and transversal bandpass filter using unequal source degeneration inductors for noise and selectivity improvement,” in Proc. Mediterranean Microwave Symposium(MMS2004), Marseille, France, June 2004, Session 2B.

40.

 

K. M. Ho, H. K. Pang, Wai-Wa Choi and Kam-Weng Tam, “Novel T-DGS l/4 dual band impedance transformer,” in Proc. Mediterranean Microwave Symposium(MMS2004), Marseille, France, Jun. 2004, Session 3C.

41.

 

K. V. Chiang, Wai-Wa Choi and Kam-Weng Tam, “Source degeneration inductor based noise suppression scheme for microwave lumped and transversal bandpass filter,” in Proc. 2003 Asia-Pacific Microwave Conference(APMC2003), Seoul, Korea, Nov. 2003, pp.1961-1964.

42.

 

C. P. Chiang#, K. P. Lei#, Wai-Wa Choi, S. W. Ting, S. W. Fok4, S. I. Hong4 and Kam-Weng Tam, “Reliability analysis of a homodyne wireless LAN receiver subject to the impedance mismatch,” in Proc. International IEEE Conference on the Business of Electronic Product Reliability and Liability, Shenzhen, China, Jun. 2003, pp. 334-337.

43.

 

K. P. Lei#, C. P. Chiang#, Wai-Wa Choi and Kam-Weng Tam, “Novel coupled-line microstrip duplexer with high frequency isolation and 2nd spurious passband suppression,” in Proc. 2002 Asia-Pacific Microwave Conference(APMC2002), Kyoto Japan, Nov. 2002, pp. 501-503.

44.

 

C. P. Chiang#, K. P. Lei#, Wai-Wa Choi and Kam-Weng Tam, “Mismatch effect on noise figure for WLAN receiver,” in Proc. The 45th Midwest Symposium on Circuits and System, Tulsa, Oklahoma, USA, 4-7 Aug. 2002, pp. 587-590.

45.

 

K. F. Chang, Kam-Weng Tam, Wai-Wa Choi and R. P. Martins, “Novel quasi-elliptic microstrip filter configuration using hexagonal open-loop resonators,” in Proc. 2002 IEEE International Symposium on Circuits and Systems, Phoenix, Arizona, USA, 26 – 29 May 2002, pp. 863-866.

46.

 

K. V. Chiang, Kam-Weng Tam, Wai-Wa Choi and R. P. Martins, “Noise performance of CMOS transversal bandpass filters,” in Proc. 2002 IEEE International Symposium on Circuits and Systems, Phoenix, Arizona, USA, 26 – 29 May 2002, pp. 871-874.

47.

 

S. W. Sin#, K. C. Lai#, K. V. Chiang, Wai-Wa Choi, Kam-Weng Tam and R. P. Martins, “An analytical linearization method for CMOS MMIC power amplifier using multiple gated transistors,” in Proc. The 4th International Conference on ASIC, Shanghai, China, 23 – 25 Oct. 2001, pp. 670-672.

48.

 

S. W. Sin#, K. C. Lai#, K. V. Chiang, Wai-Wa Choi Kam-Weng Tam and R. P. Martins, “A new IMD3 reduction approach based on composite effect of gm” and gds”,” in Proc. IEEE CAS Workshop on Wireless Communications and Networking, 9 – 10 Aug. 2001, South Bend, Indiana, pp. 357-359.

49.

 

K. H. Chiang, K. V. Chiang, K. F. Lam, Wai-Wa Choi, Kam-Weng Tam and R. P. Martins, “Modular approach for high Q microwave CMOS active inductor design,” in Proc. The IEEE Int. Conf. on Electronics, Circuits and Systems (ICECS2000), 17 – 20 Dec 2000, Jounieh , Lebanon Dec. 2000, pp. 41-44.

50.

 

K. H. Chiang, K. V. Chiang, K. F. Lam, Wai-Wa Choi, Kam-Weng Tam and R. P. Martins, “Comparative study of microwave CMOS differential active inductor,” in Proc. The First Portugal-China Workshop on Solid-State Circuits, Shanghai, China, Oct. 2000, pp. 96-98.

51.

 

K. M. Lou, C. K. Ip, K. M. Ho, Wai-Wa Choi, Kam-Weng Tam and P. Vitor, “Vessel monitoring system using GPS/GSM/GIS for small city,” in Proc. The 6th Asia-Pacific Conference on Communications (APCC2000), Seoul, Korea, 30 Oct. – 2 Nov. 2000, pp. 470-474.

52.

 

Wai-Wa Choi, Kam-Weng Tam, P. Vitor and R. P. Martins, “Active feedback amplifier approach for microwave active filter,” in Proc. IEEE International Conference on Electronics, Circuits and System (ICECS1999), Pafos, Cyprus, 5 – 8 Sep. 1999, pp. 497-500.

53.

 

Wai-Wa Choi, Z. S. Guo “Compression scheme apply on internet facsimile gateway,” in Proc. of The 1998 International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC1998), Sokcho, Korea, Jul. 1998, vol. I, pp. 315 – 318.


Applied Research Achievements and Creative Works

List of Governmental Consultancy Projects

Period   Project
2014  – 2013   Co-Principal Investigator, Research on TV Services in Macao
Funded by Bureau of Telecommunications Regulation of Macao Government
              2012   Co-Principal Investigator, Investigation Assistance to Bureau of Telecommunications Regulation (DSRT) for CTM’s Network Interruption on 6 February 2012
Funded by Bureau of Telecommunications Regulation of Macao Government
2012  – 2011   Principal Investigator, Study of Mobile Communications Service Billing in Macao
Funded by Bureau of Telecommunications Regulation of Macao Government
2010  – 2009   Principal Investigator, RFID Automatic Circulation System for FDCT Library
Funded by Macao Science and Technology Development Fund
              2009   Principal Investigator, Study of RFID Systems – Standards, Applications & Measurements in Macao
Funded by Bureau of Telecommunications Regulation of Macao Government

Reports, Summaries and Presentations to Government and Public

Year   Report
2014   Final Report of Research on TV Services in Macao, 2014.
2013   Mid-Term Report of Research on TV Services in Macao, 2013.
2012   Report of Study of Mobile Communications Service Billing in Macao, 2012.
2012   Report of “Investigation Assistance to Bureau of Telecommunications Regulation (DSRT) for CTM’s Network Interruption on 6 February 2012”, 2012.
2009   Study of RFID Systems – Standards, Regulations & Applications in Macao, 2009.
2009   Measurement Report of RFID Systems – Radiation Safety Assessment & Electromagnetic Interference Immunity Testing to Second & Third Generation Mobile Phones, 2009.
     
Year   Summary to Public
Oct. 2014   Research on TV Services in Macao – Executive Summary
Jun. 2012   Summary of “Investigation Report on Network Outage of CTM on 6 February 2012”
     
Year   Presentation to Public
29 Oct. 2014   Press Conference of “Final Report of Research on TV Services in Macao”
24 Jan. 2014   Press Conference of “Mid-Term Report of Research on TV Services in Macao”
1 Jun. 2012   Press Conference of “Investigation Report on Network Outage of CTM on 6 February 2012”

Invited Positions for Services on Informal Education

Sep. 2014   Invited Lecturer of Training Course for 2013 Guangdong Wireless Study Summer Camp for Science and Technology Development Fund of Macao SAR Government (FDCT)
2013   Invited Consultant of 2013 Guangdong Wireless Study Summer Camp for Science and Technology Development Fund of Macao SAR Government (FDCT)
2011   Invited Consultant of 2011 Nanjing Wireless Study Summer Camp for Science and Technology Development Fund of Macao SAR Government (FDCT)

Organized Activities for Informal Education (Chair)

             2012   Wireless Technology Study Summer Camp 2011
Funded by Macao Science and Technology Development Fund
https://www.fst.um.edu.mo/activities/summercamp/2011/eee2011.html
             2011   IEEE Macau MTT-S High School Wireless App Competition
Sponsored by IEEE MTT-S
http://news.umac.mo/nrs/faces/pub/viewItem.jspx?id=17686

Service to the University and the Wider Community

University and Faculty/Unit Service

Management Positions

2011 – Present   Course Area Coordinator of General Education
(Physical Science & The World)
Support coordination of all courses in the area
  University Service
2010– Present   Faculty-in-Charge of Analog Electronic Laboratory
Support numbers of fundamental courses of ECE, EME & CIS in FST
  Department Service

Committee Works

2011 – Present   Departmental Representative of Committee of FST Internship   Faculty Service
2009 –   2011   Member of General Education Course Development Team – Physical Science    
2012 – Present   Coordinator of FST ECE Student Placement Network   Department Service
    Member of FST ECE Lab Safety Officer & Department Safety    
    Member of FST ECE Master Selection Committee    
    Member of FST ECE Student Exchange Selection    
    Member of FST ECE Student Advisory Program    
    Member of FST ECE Departmental Annual Program Review Committee    
2009 – Present   Member of PhD Advisory Committee of Pedro Cheong    
Jan. 2014   Member of MSc Thesis Defense Examination Committee of
Daniel Piscarreta
   
Jul. 2013   Member of MSc Thesis Defense Examination Committee of
Chio Chan Keong
   
2011   Member of PhD Qualified Examination Committee of
Pedro Cheong
   
Oct. 2009   Chairperson of MSc Thesis Defense Examination Committee of
Lv Tingshan
   

Student Affair Services

2008 –   2010   Mentor of University Mentorship Program for FST Students   University Service

Seminars Organization

             2010   Chair of Wireless Communication Seminar Series
2006 –   2009   Co-Chair of Wireless Communication Seminar Series

High School Outreach Actives Services

2012   Chair of Wireless Technology Study Summer Camp 2012
2008 – Present   Co-PI of Wireless Technology Study Summer Camp

External Service

Services to Professional Societies

2009 – Present   Member of International Steering Committee of International Symposium on Antennas and Propagation (ISAP)
2014 –   2013   Vice-chairman of IEEE Macau AP/MTT Joint Chapter
2013 –   2012   Secretary of IEEE Macau AP/MTT Joint Chapter
2012 –   2010   Member of Fiscal Council of IEEE Macau AP/MTT Joint Chapter
Jun. –    Sep.
2011
  Trainer of The International Association for the Exchange of Students for Technical Experience (IAESTE)
2011   Chair of IEEE Macau MTT-S High School Wireless App Competition
2010   Founding Member of IEEE Macau AP/MTT Joint Chapter

Services to Governmental Agencies

Sep. 2014   Invited Lecturer of Training Course for 2013 Guangdong Wireless Study Summer Camp for Science and Technology Development Fund of Macao SAR Government (FDCT)
2013   Invited Consultant of 2013 Guangdong Wireless Study Summer Camp for Science and Technology Development Fund of Macao SAR Government (FDCT)
2011   Invited Consultant of 2011 Nanjing Wireless Study Summer Camp for Science and Technology Development Fund of Macao SAR Government (FDCT)

Editorial Works of Journal and Conferences

2014 –   2015   Guest Editor of Special Issue on “Recent Advancement of Antennas and Channel Modeling in Mobile Communications” of International Journal of Antennas and Propagation
2010 –   2011   Guest Editor-in-Chief of Special Section on Recent Progress in Antennas and Propagation Conjunction with Main Topics of ISAP2010 of The IEICE Trans. on Communications
    Reviewer of IEEE Transactions on Microwave Theory and Techniques
    Reviewer of IEEE Microwave and Wireless Components Letters
    Reviewer of IEEE Antennas and Wireless Propagation Letters
    Reviewer of IEEE Transactions on Industrial Electronics
    Reviewer of IEEE Transactions on Wireless Communication
    Reviewer of International Journal of Antennas and Propagation
    Reviewer of Microwave and Optical Technology Letters
    Reviewer of Journal of Electromagnetic Waves and Applications
    Reviewer of International Journal of Electronics and Communications
    Reviewer of Journal of Circuits, Systems & Signal Processing
2014   TPC member of International Symposium on Antennas and Propagation (ISAP2014)
2012   TPC member of Asia Pacific Microwave Conference 2012 (APMC 2012)
2011   TPC member of Asia Pacific Microwave Conference 2011 (APMC 2011)
2011   TPC member of International Symposium on Antennas and Propagation (ISAP2011)
2009   TPC member of Asia Pacific Microwave Conference 2009 (APMC 2009)
     
2008   TPC member of Asia Pacific Microwave Conference 2008 (APMC 2008)
2008   TPC member of IEEE Asia Pacific Conference on Circuits and Systems
(APCCAS 2008)

Judges and Panel

Jul. 2012   Member of Judges of IEEE Macau Project Competition 2012 (Macau Student Branch)
Oct. 2011   Chair of Judge Panel of The 12th IEEE HK AP/MTT Postgraduate Conference 2011
Oct. 2008   Chair of MTT Session of The 9th IEEE HK/Macau AP/MTT Postgraduate Conference

Conferences and Seminars Organization

2011   Member of Organization Committee of International Conference on System Science and Engineering 2011 (ICSSE2011)
2008 –   2011   General Secretary of International Symposium on Antennas and Propagation 2010 (ISAP2010)
2010   TPC Co-Chair of International Symposium on Antennas and Propagation 2010
2009   Member of Organizing Committee of 2009 IEICE Technical Meeting on Antennas and Propagation
     
2008   Co-Chairs of Organizing Committee of Asia-Pacific Microwave Conference 2008 (APMC2008) Macao Session
2008   Member of Organizing Committee of The 9th IEEE (HK/Macau) AP/MTT Postgraduate Conference
2006   Member of Organizing Committee of The 2006 Cross-Strait Tri-Regional Radio Science and Wireless Technology Conference (CSTRWC2006)
2004   Member of Organizing Committee of The 5th IEEE (HK/Macau) AP/MTT Postgraduate Conference
2004   Chair of Publication Committee of 2004 IEEJ International Analog VLSI Workshop

Contact Details

Faculty of Science and Technology
University of Macau, E11
Avenida da Universidade, Taipa,
Macau, China

Room: E11-3036
Telephone: (853) 8822-8468
Fax: (853) 8822-2426
Email: welsyc