Summary
International Symposium on Antennas and Propagation
2010
Session Number:4FA2
Session:
Number:4FA2-5
Aperture-coupled Differentially-fed Dielectric Resonator Antenna With/Without Parasitic Patches
Cheng-Xiang Hao, Bin Li, Kwok Wa Leung, Xin-Qing Sheng,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
In recent years, the microwave differential circuit has received increasing attention for its good performance such as the improved noise immunity, lower cost, smaller size, and harmonic rejection [1]. Traditionally, a balun is often used as a transition between the differential circuit and single-ended antenna. However, it inevitably increases the system loss and size. To avoid this problem, some differentially fed antennas have been proposed [2]-[7], i.e., Petosa [2] and Xue [3] et al. proposed the probe-fed wideband differential microstrip antennas for applications that require a low cross-polarization level. It was found that the differentially fed antenna can be characterized using the odd-mode reflection coefficient Γodd [4], the differential impedance Zd [5], and the mixedmode S parameter Sdd11 [6]. A detailed discussion on these parameters has also been given in [6]. Because of the inherent advantages of its small size, low loss, light weight, the dielectric resonator antenna (DRA) has been studied extensively [7] in the last two decades. Recently, the authors studied strip-coupled differentially fed rectangular DRAs [6], where only the linearlypolarized (LP) DRA was considered. In this paper, the aperture-coupled differentially fed rectangular DRA is investigated. Both linearly- and circularly-polarized (CP) DRAs are studied. A rectangular DRA excited in its fundamental broadside TE111 y mode at 2.4GHz is used for demonstration. To excite the CP wave, two parasitic patches are attached on the side walls of the DRA [9]. The commercial software Ansoft HFSS was used to simulate the DRA. Measurements were carried out to verify the simulations and reasonable agreement between them was obtained.