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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.The antenna is based on two cylindrical dielectric resonators (CDRs) excited by rectangular slots placed below the CDRs.
To improve the coupling between the excitation slot and CDR an offset distance between the center of CDR and center of excitation slot is introduced.
The optimized offset position of the center of excitation slot is found to be mm from the center of CDR.
Antennas coupled with sensors such as microbolometers [1–5], metal-insulator metal (MIM) diodes [6, 7] have been investigated for imaging and spectroscopy applications in the millimeter wave (MMW) and terahertz (THz) spectral regions.
In antenna-coupled microbolometers, the antenna resonant current flows in the microbolometer located at the feed of the antenna causing joule heating in the microbolometer element.
All of the previously mentioned DRAs qualities in addition to the ongoing developments, at Prince Sultan Advanced Technologies Research Institute (PSATRI), for photolithographically patternable polymer-ceramic composites with dimensions commensurate with MMW W-band DRAs, have led to the development of the DRA-coupled sensor configuration presented in this work.
In this paper we present a novel antenna-coupled sensor configuration for 94 GHz detection.
Initially, the top aluminum layer was also fully covered with aluminum; during the optimization process we found that the main to side lobe ratio in antenna radiation pattern is highly influenced by the dimensions of length () of top aluminum ground plane; by optimizing the dimensions of top aluminum ground plane a difference of approximately 10 d B between the main and first side lobe is achieved.
The optimized dimensions for the top aluminum layer are found to be length = 5.82 mm.
The walls of the resonator are partially transparent to radio waves, allowing the radio power to radiate into space.
An advantage of dielectric resonator antennas is they lack metal parts, which become lossy at high frequencies, dissipating energy.