Circular Polarized Dielectric Resonator Antennas Using a Single Probe Feed

Abstract

Abstract-In this paper six novel Dielectric Resonator Antennas (DRAs) providing Circular Polarization (CP) using single probe feeds are proposed.By splitting the fundamental mode of conventional rectangular or cylindrical DRA into two near-degenerate orthogonal resonant modes, CP is obtained. The proposed antennas are numerically investigated using Finite Element Method (FEM). Parametric study on all antennas is carried out. The results show that the impedance bandwidth (S 11 < −10 dB) of all reported antennas is in the range of 112-140 MHz. Also, the Axial Ratio bandwidth (AR < 3 dB) range of presented antennas is 28-33 MHz. The investigation shows radiation patterns of all proposed antennas are remaining broadside throughout the bandwidth.

A state-of-art review on performance improvement of dielectric resonator antennas

“…Yang et al have realized CP in an elliptical DRA (placed at 45° with respect to the slot) with both coaxial probe (∼5.2%) as well as microstrip line (4.5%) feed while exciting in two orthogonal modes. Malekabadi et al have proposed six different DRs with coaxial probe type feed for generating circular polarization with axial ratio bandwidth of 5 MHz, by splitting the fundamental modes of the respective shapes into two degenerate orthogonal resonant modes. For the first time Zainud‐Deen et al have brought CP in a super quadric type DR. Khamas has perceived a 3.9% AR bandwidth (<3dB) by utilizing an optimized spiral arm feed on a hemispherical DRA.…”

Quasi-Optical Bessel Resonator

“…The processing errors of the designed QOBR are also considered. Similar to the practical applications of a quasi-optical open resonator sustaining Gaussian modes [31][32][33][34][35][36][37][38], we believe that the designed QOBR, besides the production of Bessel-type modes, have many promising applications in millimeter range, such as frequency measurement, spectrum analysis, transmission characteristic research, power combination, and dielectric parameter measurement. Therefore, the study of the QOBR in these spectrum ranges has important practical significance.…”

Higher Order Mode Layered Cylindrical Dielectric Resonator Antenna

“…Furthermore, a CP cylindrical DRA fed by a quadruple strip has been investigated experimentally, where four vertical conformal strips have been placed around the DRA circumference in order to achieve wider AR and impedance bandwidths of 25.9% and 34.5%, respectively, in conjunction with a broadside gain of 5 dBic [9]. In another study, a single probe feeding has been utilized to excite several CP cylindrical and rectangular DRAs, where it has been noted that two orthogonal resonance modes, TM x 110 and TM y 110 , can be excited by changing the probe length to achieve maximum AR and impedance bandwidths of 1.2% and 5.7%, respectively [10]. Additionally, a study of a dual-band CP cylindrical DRA that operates in the HE 111 and HE 113 resonance modes have been presented with respective impedance and AR bandwidths of 23.5% and 7.4% and a maximum gain of 7 dBic [11].…”