International Journal of Microwave and Wireless Technologies

Research Papers

A low-cost millimeter-wave whispering gallery-mode-based sensor: design considerations and accurate analysis

Aidin Taeba1 c1, Mohammad Neshata2, Suren Gigoyana3 and Safieddin Safavi-Naeinia1

a1 Department of Electrical and Computer Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Canada N2L 3G1. Phone: +1 519 888 4567 ext. 31437

a2 Department of Physics and Astronomy, Johns Hopkins University, Baltimore, USA

a3 Institute of Radiophysics & Electronics NAS, Ashtarak, Armenia


A dielectric waveguide-based structure coupled to a whispering gallery mode (WGM) disc resonator is introduced as a low-cost integrable millimeter-wave (mm-wave) bio-sensor. An efficient variational analysis method is developed and applied to the WGM. Three sets of sensors, operating in different ranges of frequency from 85 to 220 GHz, are fabricated and tested. The performance of the fabricated bio-sensor is demonstrated for sensing different concentrations of glucose solution samples at D-band. Also, the sensitivity, selectivity, and repeatability of these sensors are examined.

(Received October 31 2011)

(Revised March 22 2012)


  • Microwave measurements;
  • Passive components and circuits


c1 Corresponding author: A. Taeb Email: