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International Journal of Antennas and Propagation
Volume 2015, Article ID 736291, 6 pages
Research Article

Fabrication and Characterization of a W-Band Cylindrical Dielectric Resonator Antenna-Coupled Niobium Microbolometer

1Prince Sultan Advanced Technologies Research Institute (PSATRI), King Saud University, Riyadh 11421, Saudi Arabia
2Electrical Engineering Department, King Saud University, Riyadh 11421, Saudi Arabia
3Electrical and Computer Engineering Department, Concordia University, Montreal, QC, Canada H3G 1M8
4KACST Technology Innovation Center in RFTONICS, King Saud University, Riyadh 11421, Saudi Arabia

Received 1 October 2014; Revised 28 December 2014; Accepted 28 December 2014

Academic Editor: Paolo Burghignoli

Copyright © 2015 M. Abdel-Rahman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We report on the fabrication and characterization of a novel antenna-coupled detector configuration for detection at 94 GHz, a coplanar waveguide- (CPW-) fed, slot-excited twin dielectric resonator antenna- (DRA-) coupled niobium (Nb) microbolometer. The antenna is based on two low permittivity cylindrical dielectric resonators (CDRs) excited by rectangular slots placed below the CDRs. The antenna resonant currents are fed to an Nb microbolometer by the means of a CPW feed. The ceramic DRA structure is manufactured using a novel fabrication process that enables patterning an SU-8–Alumina (Al2O3) nanopowder composite using conventional photolithography. The detector measured a voltage responsivity of 0.181 V/W at a modulation frequency of 150 Hz. The detector measured a time constant of 1.94 μs. The antenna radiation pattern of the developed detector configuration was measured and shows a good agreement with the simulation.