Abstract
A dual-polarized dielectric resonator antenna (DRA) fed by two orthogonal microstrip lines has been explored employing coupled-resonator spatial filter (CRSF) frequency selective surface (FSS) as superstrate which, to the best of our knowledge, is reported for the first time. The DRA with er = 20 has been used as a primary radiator, excites fundamental TE111 mode. A CRSF FSS has been placed above the ground plane at a distance of half wavelength and a 3.4 dBi increased gain has been found compared to the gain without FSS. Using Arlon AD270 both the antenna and the FSS have been fabricated and experimental measurements have been carried out. The proposed antenna with FSS offers an impedance bandwidth of 5.1% covering frequency from 6.4 to 6.74 GHz with a maximum gain of 8.9 dBi at the resonant frequency for the port1. For the port2, the DRA with FSS resonates at 6.54 GHz with an impedance bandwidth of 5.3% covering frequency from 6.37 to 6.72 GHz. A good agreement has been observed between the measured and simulated results. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1415–1420, 2016
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