Abstract
This article presents the experimental validation of circularly polarized (CP) resonant cavity antenna (RCA) operating at 300 GHz. The CP-RCA consists of two main parts, one operates as a base feeding antenna (five metallic layers), while the other one generates high gain with circular polarization (aperture-type frequency selective surface (FSS) metallic layer). Both parts are designed and fabricated to be directly mounted onto a standard WM-864 waveguide flange. The proposed CP-RCA prototype is made of metallic layers and its design relies on the laser cutting brass technique to simplify fabrication and low-cost. The measured 3-dB RHCP directivity bandwidth is 10 % with a peak directivity of 17 dBic. This antenna yields a measured axial ratio (AR) bandwidth (AR < 3dB) of 5.12 GHz. This work, to the best of our knowledge, is the first one to develop a CP-RCA antenna aperture FSS-based layer at 300 GHz.
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