Circularly polarized cylindrical dielectric resonator antenna excited by square ring slot with a T‐shaped microstrip line

Abstract

In this article, a cylindrical dielectric resonator antenna (CDRA) excited by a 45° rotated square ring slot with a T‐shaped coupling microstrip line is investigated for circularly polarized (CP) operation. The proposed antenna shows the dual band characteristics and the lower band is generated due to T‐Shaped microstrip line and upper band is due to CDRA. In the proposed antenna, the two degenerate broadside orthogonal modes ( HE11δx mode and HE11δy mode) of the CDRA are used to realize CP radiation. The prototype of the proposed antenna has been fabricated and tested. The measured |S11| bandwidth in the lower and upper band is found to be 14.65 and 19.86%, respectively. The measured 3‐dB axial ratio bandwidth of 1.46 and 6.01% is achieved in the upper band only. Proposed antenna has been found suitable for wireless application.

Single-feed circularly polarized rectangular dielectric resonator antenna coupled with dual mode slot-line square ring resonator

“…The fourth is to add metallic strips onto DRAs' side walls [11,12]. And the last is to modify the coupling aperture embedded on the ground plane [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37].…”

“…The aperture-coupling excitation method with a microstrip feed-line has the advantage of having the feed network located below the ground plane, thus avoiding spurious radiation and the advantage of integrating DRAs with printed feed structures [38]. Therefore, this excitation method has usually been used to excite the DRAs [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,39] and the last method of designing a single-feed CP DRA (modifying the coupling aperture embedded on the ground plane) is the most popular one by designers. There are many kinds of modified coupling apertures used to design single-feed CP DRAs.…”

Wideband circularly polarized square dielectric resonator antenna for WLAN/WiMAX applications

“…Single point fed dielectric resonator antenna (DRA) produces a narrower CP bandwidth of approximately 3% and its feeding geometry is simpler as compared with other two feeding mechanisms. Examples of single feed are stacked rectangular DRA having an axial ratio (AR) bandwidth of 6%, cylindrical dielectric resonator (DR) fed by a square ring slot was produced the CP bandwidth of 1.46% and 6.01%, spidron fractal DRA with 11.57% of 3‐dB AR bandwidth was also presented . Examples of some single‐point fed wideband CP DRAs are such as a rectangular and half splits cylindrical DRA was designed with an AR bandwidth of 41.01%, a stair shaped rectangular DRA with a CP bandwidth of 22% was reported and a rectangular DR excited through an Archimedean slot was also presented with an AR bandwidth of 25.5% .…”

Circularly polarized rectangular dielectric resonator antenna fed by a flag shape microstrip line for wideband applications

“…Dielectric resonator antenna (DRA) has been studied widely since last few decades for its remarkable features such as broad bandwidth, minimum loss, small size, negligible conductor loss due to high radiation efficiency, easily integrated with various coupling techniques, design flexibility, and ease of excitation 1,2 . In present scenario, linearly polarized DRA has been substituted by circularly polarized (CP) DRA due to its salient features such as, the CP antenna provides orientation-free transmission between the transmitting and receiving antenna, reduces multipath reflections, and other kind of interferences, better weather penetration, better mobility and enhanced signal power on receiver side 2,3 .…”

“…On the basis of published techniques, three categories are classified to realize CP radiation, such as single-point-fed 3 , dual or multiple-point-fed 4 and sequential rotation technique 5 . In earlier published techniques, about~3% narrowband AR has been achieved by regular CP designed DRAs with the single feed scheme, but in recent years, many broadband AR in DRAs have been reported by researchers with single-point feeding technique.…”