A 3-D Meandered Probe-Fed Dual-Band Circularly Polarized Dielectric Resonator Antenna.

Amir Altaf,Youngoo Yang,Keum Hwang,Kang-Yoon Lee,Sang-Hwa Yi,Jin-Woo Jung

doi:10.3390/s18082421

Abstract

A dual-band circularly polarized (CP) dielectric resonator antenna (DRA) designed on multi-layer substrates is proposed. An asymmetric C-shaped metallic strip is also incorporated into the upper side of the top substrate in the proposed design. The hexagonal dielectric resonator (DR) is excited by the proposed 3-D meandered probe, which generates multiple orthogonal TE-modes. It is found that the lower CP band arises due to the pair of fundamental modes of the hexagonal DR. In the upper CP band, pairs of higher broadside and even modes of the hexagonal DR are combined with a CP band that is induced by the asymmetric C-shaped metallic strip to yield a wide 3 dB axial ratio bandwidth (ARBW). A prototype of the proposed DRA is fabricated for experimental verification. The antenna exhibits a measured −10 dB reflection bandwidth of 56.43% (2.15–3.84 GHz). The far-field measurement shows measured 3 dB ARBWs of 7.56% (2.29–2.47 GHz) with a peak gain of 5.6 dBic and 16.47% (3.12–3.68 GHz) with a peak gain of 7.84 dBic in the lower and upper bands, respectively.

Highlights

With recent advances in modern communication systems, the demand for an efficient widebandRF front-end is on the rise
A probe-fed circularly polarized (CP) dielectric resonator antenna (DRA) was presented, in which a wide CP band is split into two CP bands with the help of a metallic strip to yield 3 dB axial ratio bandwidth (ARBW) of 10.6% in the lower band and 13.5% in the upper band [17]
The axial ratios (ARs), left-handed circular polarization (LHCP) gain, and radiation patterns were evaluated in an RF anechoic chamber where a dual-polarized horn antenna was utilized

Summary

Introduction

With recent advances in modern communication systems, the demand for an efficient wideband. The dual-fed technique was used to excite pairs of fundamental HE111 and higher HE113 modes in a cylindrical DR to yield 3 dB ARBWs of 12.4% and 7.4% in the lower and upper bands, respectively [12]. CP DRAs [13,14,15,16] have slot-coupled configurations, which decreases the FBR To solve this problem, a probe-fed CP DRA was presented, in which a wide CP band is split into two CP bands with the help of a metallic strip to yield 3 dB ARBWs of 10.6% in the lower band and 13.5% in the upper band [17]. No literature has been published far on a dual-band CP DRA design which works by the excitation of fundamental and higher order modes along with the absence of backward radiation simultaneously.

Antenna Design and Analysis

Measurement Results and Discussion

Conclusions