Higher Order Mode Excitation for High-Gain Broadside Radiation From Cylindrical Dielectric Resonator Antennas

Abstract

A resonant mode ( ), other than those ( and ) conventionally excited and used in a cylindrical dielectric resonator antenna (CDRA) has been examined with a view for using it as another radiating mode with broadside radiation patterns. Excitation of the mode, being the most challenging aspect, has been discussed and resolved by employing an innovative technique. The proposed concept has been successfully verified and experimentally demonstrated for the first time. More than 8-dBi peak gain with excellent broadside radiation has been obtained from a prototype shaped from a commercially available low-loss dielectric material with relative permittivity 10.Index Terms-Cylindrical dielectric resonator antenna, dielectric resonator antenna, radiation modes in cylindrical dielectric resonators.

Laterally Placed CDRA with Triangular Notches for Ultra Wideband Applications

“…The electric field distributions are shown at the three resonant frequencies 5.12 GHz, 7.28 GHz and 9.48 GHz. The electric field distribution at the first resonant point are similar to the HE 11δ mode, the second resonant point resembles the HE 12δ mode [13] and at 9.48 GHz the field distribution resembles the mode HE 21δ of CDRA. The measured radiation patterns at the three resonant frequencies are shown in Figure 11.…”

Wideband Cylindrical Dielectric Resonator Antenna Operating in HEM11δ Mode with Improved Gain: A Study of Superstrate and Reflector Plane

“…Nasimuddin and Esselle [11,12] have experimented peak gain of >8 dBi by placing a surface mounted horn around a rectangular and modified rectangular DRA, respectively. According to Guha et al in [13], the exploration of higher order mode (HEM 12 ) also gives high gain of 8.5 dBi. Further, the use of superstrate with DRA has been deeply analyzed by research groups led by Coulibaly et al [7], Dutta et al [14], and Dong et al [15].…”

High gain spherical DRA operating on higher-order mode excited by microstrip patch

“…Petosa and Thirakoune [3] showed that a slot fed rectangular DRA operating on TE 13 mode and TE 15 mode can achieve gains of 8.2 dBi and 10.2 dBi, respectively. Guha et al [4,5] proposed a higher-order mode excitation method for cylindrical DRA using microstrip patch and showed that a cylindrical DRA operating on HEM 12 mode can achieve gain of 9.5 dBi. Mrnka and Raida [6,7] showed that a slot fed cylindrical DRA operating on the combination of two higherorder hybrid modes (HEM 133 mode and HEM 123 mode) can achieve gain of 11.6 dBi.…”