Dr. Jawad of Queen's University

Multifunctional Filtering Antennas

Jawad Y. Siddiqui

University of Calcutta, Queen's University and Royal Military College of Canada

Summary:

Modern RF systems often require multiple antennas to support various frequency bands. Reconfigurable antennas address this need by providing frequency agility, compact size, and reduced hardware complexity. The proposed antenna achieves this through electrical reconfiguration enabled by the embedded SRRs and PIN diodes.

The techniques proposed in this work have been implemented on two types of UWB antennas, a printed monopole antenna and a printed antipodal tapered slot antenna (ATSA) to validate the concept on radiators with distinct radiation characteristics: omnidirectional and directional, respectively. In both cases, split ring resonators (SRRs), magnetically coupled to the CPW feed line, function as band-stop filters, introducing a frequency notch in the UWB response around their resonance. When a set of PIN diodes embedded in the feed line are forward biased (ON), the antenna transforms into a narrowband band-pass filter centered at the same resonance frequency, thereby realizing complementary frequency responses from a single antenna structure.

A key feature of the design is that it preserves the original radiator geometry. The work demonstrates a compact, versatile, and effective approach to achieving multifunctionality in UWB antennas. The integration of reconfigurable filtering into the feedline enables real-time switching between wideband and narrowband operation, making the design especially suitable for cognitive radio, multi-standard wireless systems, and MIMO applications.

Biography:

Jawad Yaseen Siddiqui has over two decades of extensive teaching and research experience in applied electromagnetics, RF and microwave circuits, antennas and propagation. He has taught courses at several Universities in Canada and India. 

He is an Associate Professor at the Institute of Radio Physics and Electronics, University of Calcutta, India. He is currently a Senior Research Associate at the Royal Military College of Canada and an Adjunct Faculty member (Term) in the Department of Electrical and Computer Engineering (ECE) at Queen’s University, Canada. He has previously served as a Visiting Professor in the ECE Department at the University of Alberta, Edmonton.

Additionally, he has worked as a research associate in the ECE Department at Queen’s University and as a postdoctoral fellow and research assistant at the Royal Military College of Canada. He has been actively involved in several research projects funded by the Department of National Defence (DND) and Defence Research and Development Canada (DRDC) in Canada. 

He is the Chair of the AP-S SIGHT, a standing committee of the IEEE Antennas and Propagation Society (AP-S) and has serve on several other committees within the Society. He has also been a member of the Meetings and Symposia Committee of the IEEE Microwave Theory and Technology Society (MTT-S) and served as the MTT-S representative on the IEEE Technical Activities Board (CPC) in 2021. 

He is the recipient of the 2022 Institution of Electronics and Telecommunication Engineers (IETE)–S.N. Mitra Memorial Award for his contributions and leadership in radio broadcast science and technology. He also received the 2015 IEEE AP-S Ulrich L. Rohde Humanitarian Technical Field Project Award for excellence in the humanitarian use of technology. He is a Senior Member of IEEE and a member of IEEE Eta Kappa Nu (HKN). He has authored 150+ publications in peer-reviewed journals and conferences.

Email:

Address:Kingston, Ontario, Canada