Sciences et génie, Technologies de l’information et des communications (TIC), Technologies disponibles, Télécommunications, Traitements du signal


Prototype entièrement fonctionnel ayant une performance supérieure sur un fonctionnement à large bande et une excellente concordance entre les résultats de mesure et les résultats simulés

-Description en anglais seulement-

The challenge in waveguide circulators market  

  • The microwave devices market was USD 5.58 Billion in 2016 and is projected to reach USD 8.22 Billion by 2022
  • Junction circulators were proposed 60 years ago for use in different communication systems in both commercial and defense applications
  • This type of component is deployed to provide source protection in all systems and double the system capacity by supporting channel duplexing
  • Since then, they have gone through substantial development, but always based on the original design paradigm
  • One major problem with the available designs of the wideband circulators is the dependency on empirical design equations and/or approximated solutions
  • This leads to production processes that pass through an iterative sequence between the testing laboratory and the machine shop (and other processing stages)
  • Wideband circulators must be tuned in post-fabrication. This problem increases both the production time and cost of the final component

New design/method for wideband junction circulator

  • A closed form solution for the junction circulator has been developed which provides an accurate and straightforward design procedure
  • The innovative design method has been developed for stripline and ridge gap waveguide (RGW) technologies
  • Both technologies have the advantage of supporting the TEM mode, which is not subjected to signal dispersion, this minimizes the signal distortion and simplifies the signal processing needed to retrieve the transmitted signal over the channel
  • The inventive procedure and the proposed configuration for the junction circulator have been utilized to create circulators in different frequency bands
  • The presented circulators have been evaluated through several commercial numerical packages
  • The proposed matching technique can ensure high power handling capability and high frequency compliance
  • The simulated results have been shown superior response and exceptional characteristics in terms of the matching level and covered bandwidth
  • Fully working prototype without any post fabrication tuning and with a superior performance over a wideband operation
  • Measurements is done for each 2 ports while terminating the 3rd port with a matched load
  • Measurement results have an excellent with the simulated ones
  • Technology developed by Prof. Ahmed Kishk, Shokry Shamseldin and Mahmoud Elsaadany (Electrical and Computer Engineering, Concordia University)

The new design of RF microwave circulator presents multiple competitive advantages  

  • Ultra-wideband stripline and ridge gap circulators
  • Superior electrical specifications in terms of the deep matching and high isolation level
  • Short production time frame and lower cost for the overall process
  • Smaller footprint and no dependency on non-standard materials
  • High power handling capability for both peak and average power

Interesting market applications in wideband RF microwave circulators

  • Ultra-wideband communication systems
  • Millimeter wave applications such as 5G applications
  • Wideband- high power radar systems
  • Full duplex communication applications

Business opportunity

  • PCT has been filed on February 16th 2018
  • Technology available for licensing


If you are interested by this technology, please contact :
Dareen Toumi, Technology Analyst, Engineering, (514) 618-9297


Concordia University

Main inventors


Ahmed Kishk, Professor, Electrical and Computer Engineering

Prof. Ahmed Kishk received the M.Eng. and Ph.D. degrees from the Department of Electrical Engineering, University of Manitoba, Winnipeg, MB, Canada, in 1983 and 1986, respectively. In 1981, he joined the Department of Electrical Engineering, University of Manitoba. He was the Chair of the Physics and Engineering Division, Mississippi Academy of Science, Jackson, MS, USA, from 2001 to 2002. Since 2011, he has been the Trier 1 Canada Research Chair in Advanced Antenna Systems. He is currently a Professor with Concordia University, Montréal, QC, Canada. Dr. Kishk was a Distinguish Lecturer of the Antennas and Propagation Society from 2013 to 2015. From 1990 to 1993, he was an Associate Editor of the IEEE Antennas and Propagation Magazine. He was an Editor of the IEEE Antennas and Propagation Magazine from 1993 to 2014. He was a Co-Editor of the “Special Issue on Advances in the Application of the Method of Moments to Electromagnetic Scattering Problems” of the ACES Journal. He was also an Editor and the Editor-in-Chief of the ACES Journal in 1997 and from 1998 to 2001, respectively


Shokry Shamseldin, Researcher, Electrical and Computer Engineering

Shoukry I. Shams received the B.Sc. (Hons.) and M.Sc. degrees in electronics and communications engineering from Cairo University, Giza, Egypt, in 2004 and 2009, respectively, and the Ph.D. degree in electrical and computer engineering from Concordia University, Montréal, QC, Canada, in 2016. From 2005 to 2006, he was a Teaching and Research Assistant with the Department of Electronics and Communications Engineering, Cairo University. From 2006 to 2012, he was a Teaching and Research Assistant with the IET Department, German University in Cairo, Cairo, Egypt. From 2012 to 2016, he was a Teaching and Research Assistant with Concordia University, where he is currently a Senior Research and Development Engineer with SMC and an Affiliated Assistant Professor with the ECE Department


Mahmoud Elsaadany, Researcher, Electrical and Computer Engineering

Mahmoud Elsaadany received the B.Sc. (Hons.) and M.Sc. degree in electrical engineering from Cairo University, Giza, Egypt, in 2006 and 2010, respectively, and the Ph.D. degree in electrical and computer engineering from Concordia University, Montréal, QC, Canada, in 2018. He was a Researcher with Qatar University, Doha, Qatar, from 2008 to 2010, and the iCore Labs, University of Alberta, Edmonton, AB, Canada, from 2011 to 2014. His current research interests include resource allocation for wireless networks, cognitive radio networks, machine-type communication, and optimization for the next-generation cellular networks