Strip-fed rectangular dielectric resonator antennas with/without a parasitic patch

Abstract

A rectangular dielectric resonator antenna (DRA) was studied theoretically and experimentally. The rectangular DRA is excited by a strip, which is compatible with a coaxial probe. Both linearly polarized (LP) and circularly polarized (CP) fields of the antenna are considered. In previous studies of the LP rectangular DRA, only the fundamental TE 111 mode has received much attention. In this paper, it is found that the fundamental TE 111 mode, together with the higher-order TE 113 mode, can be used to design a wide-band LP DRA. The bandwidth of the dual-mode DRA can be over 40% for a conventional rectangular DRA with a simple feed. For the CP mode, a parasitic patch is attached on a side wall of the DRA to excite a degenerate mode. In both the LP and CP cases, the finite-difference time-domain (FDTD) method is used to analyze the problems. The results agree reasonably with measurements.Index Terms-Circularly polarization, dielectric resonator antennas (DRAs), finite-difference time-domain (FDTD), parasitic patch, wide-band antennas.

Wideband Sierpinski Carpet Fractal Shaped Cylindrical Dielectric Resonator Antenna for X-Band Application

“…Over the past few years researchers have tried to improve the impedance bandwidth of these DRAs to increase its functionality. Wideband DRA has been demonstrated for cylindrical DRA (CDRA) by Chair et al [2] and for rectangular DRA by Li and Leung [3]. Systematic analysis of improving bandwidth using this mode merging technique has been reported by Young and Long [4].…”

Gain enhancement in cubic DRA with modified microstrip feed for WLAN applications

“…Gain of the omnidirectional cylindrical DRA is enhanced from 1.71 dB to 4.06 dB by exciting it in TM 015 modes [10]. In [11] band-width of the RDRA has been enhanced up to 40% by using TE 111 mode together with TE 113 modes. In [12] an RDRA is operated to be working in TM modes.…”

“…For example, peak broadside gain is achieved by using uniaxial anisotropic materials in RDRA [7], and cylindrical DRA is integrated within a cylindrical electromagnetic band gap (EBG) substrate [8]. These integrated techniques are not easy for fabrication so the technique of exciting a DRA in higher order modes [9,10,11,12] was reported. RDRAs were excited in their higher order modes to achieve higher gain [9].…”

Dual-mode dielectric resonator antenna and array fed by planar slot

“…To overcome this limitation, a series of bandwidth expansion approaches such as the use of specially shaped dielectric resonators (DRs) [11,12,13,14], special feedings [15,16,17] and multiple stacked dielectric resonator elements [18,19,20,21] have been developed. A wider bandwidth can also be achieved by merging the bands with adjacent modes of a DR [22,23,24,25]. The nonradiating modes were excited, which can increase the gain variations over the impedance bandwidth and make unstable radiation patterns [22,23].…”