Millimeter-Wave Electronics Group
Queen's University at Kingston
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Research

Antennas





   


Tunable monopole antenna with measured frequency shift of up to 23.7% and impedance  band width of 29.9% ... read more
Antipodal Vivaldi phased array exhibiting 90° of beam scanning to 6.5 GHz and realized gain of 13.1 dBi ... read more
  
Millimeter-wave Bull's-Eye antenna with peak gain of 18.9 dBi at 36.1 GHz and return loss below -15 dB ... read more

 

 



Circuits and Systems

Massive MIMO systems use high-resolution phase shifters for beam-forming.  We have set performance records for low phase-error, high-resolution phase shifters using  that are electronically tunable over the full 360° range. Our technique (figure right) uses coarse and fine vector scaling broadband to obtain precise  vector amplitude control, resulting in measured RMS
phase and amplitude errors of 1.25° and 0.7 dB, respectively, at 5.4 GHz. The central component of the system are microwave operational transconductance amplifiers (OTAs) pioneered in our group ... read more
 


Stringent linearity requirements are placed on power amplifiers (PA) found in scientific test instrumentation because the equipment's performance has to be superior to the circuits under test.  Using gallium nitride (GaN) transistors for power amplification and employing  RF digital-assist methods, our Group has developed broadband power amplifiers delivering 2 Watts of RF power over a 6 GHz band- width with a measured OIP3 above +50 dBmThe PA output stage was designed using a GaN HFET process at the Canadian Photonics Fabrication Centre in Ottawa ... read more

This distortion-cancelling circuit block (cell) reduces signal distortion in microwave amplifiers inde- pendently of the inner-workings of the amplifier. Therefore, the cell can be used to improve the performance of generic off-the-shelf amplifiers. The distortion canceller uses the principle of ... read more




Collaborators (current and former)
  • Grafoid Inc.
  • Guildline Instruments Ltd.
  • California State University Northridge, USA
  • Defense Research and Development Canada
  • Version 2 Inc.
  • Capella Aerospace
  • Test Photonics Ltd.
  • Royal Military College of Canada
  • INAOE, México
  • Univ. Federal do Rio Grande do Sul, Brazil
  • Gain Microwave Corp.
  • CEIT, San Sebastián, Spain
  • Universidad de Navarra, Spain
  • Universita di Trento, Italy
  • Xi'an Jiaotong University
  • Gennum Corp.
  • Universiteit Twente, Holland
  • Politecnico di Torino, Italy
  • CINVESTAV del IPN, México
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