A Singly Fed Wideband Circularly Polarized Dielectric Resonator Antenna

Abstract

A singly fed wideband circularly polarized (CP) dielectric resonator (DR) antenna (DRA) with four sequentially rotated metallic plates is investigated. The square DRA is excited by a microstrip-coupled cross-slot to generate CP fields. By introducing four vertical metallic plates around the DR, three adjacent axial-ratio (AR) passbands are generated due to the cross-slot-fed DRA, the rotated metallic plates, and the interaction between the DR and metallic plates, leading to a very wide AR bandwidth. A prototype has been fabricated and measured to validate the design. Measured results show that the proposed CP DRA has a −10 dB impedance bandwidth of 46.9%, a 3 dB AR bandwidth of 49.5%, and an average gain of 4.7 dBic within the passband.