Compact wideband circularly polarised dielectric resonator antenna

Abstract

A new geometry of compact wideband/dual-band circularly polarised dielectric resonator antenna (DRA) is presented. First, a wideband DRA is realised by a rectangular dielectric resonator excited by a vertical coaxial probe feed which is supported by a small substrate. Circular polarisation is achieved by utilising a configuration of the DRA feed that excites orthogonal modes inside the DRA. A 3 dB axial-ratio bandwidth of about 20.8% (9.05-11.14 GHz) is achieved. Second, extension to dual-band circularly polarised operation is then realised by additionally removing a corner of the rectangular DRA at 45°and adding a floating parasitic strip. The experimental results demonstrate an impedance bandwidth of about 59.8% (6.57-12.18 GHz) and the dual 3 dB axial-ratio bandwidths of about 10.6% (8.31-9.24 GHz) and 13.5% (10.18-11.66 GHz). The measured peak gain varies from 4.47 to 4.86 dBiC in the lower band and 4.33 to 4.91 dBiC in the upper band.

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

“…Note that the height includes the heights of the DR and the substrate of each design and that represents the wavelength at the center frequency of the lower CP band. The proposed work offers superior performance compared to other outcomes [ 15 , 16 , 17 ] in terms of the upper 3 dB ARBW and peak gains on both CP bands, as well as a more compact height compared to the latter study [ 17 ]. In short, the proposed work offers overall good performance in terms of the 3 dB ARBWs, peak gains, and height compared to the aforementioned works.…”

“…Finally, a comparison was made between the proposed antenna and those in earlier published works [ 13 , 14 , 15 , 16 , 17 ], as shown in Table 3 . Compared with two studies [ 13 , 14 ], the proposed antenna possessed wider 3 dB ARBWs on both CP bands along with higher gains and a more compact height of 0.22 compared to the second study [ 14 ].…”

“…However, all of the aforementioned single-fed 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 ]. Nonetheless, no literature has been published thus 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.…”

Wideband circularly polarized sectored conical dielectric resonator antenna excited by S‐shaped slot

“…When a rectangular DR is loaded with parasitic conducting strip, CP mode is excited with 25% AR bandwidth. A floating parasitic strip attached to rectangular DR by removing some portion at 45° of one corner could be used to get dual band cp with 10.6% and 13.5% of 3‐dB AR bandwidth . Also, a rectangular stair‐shaped dielectric resonator antenna excited by a narrow rectangular slot rotated 45° with respect to sides of the DRA to get CP with 10.6% of 3‐dB AR bandwidth .…”

“…A floating parasitic strip attached to rectangular DR by removing some portion at 458 of one corner could be used to get dual band cp with 10.6% and 13.5% of 3-dB AR bandwidth. 6 Also, a rectangular stair-shaped dielectric resonator antenna excited by a narrow rectangular slot rotated 458 with respect to sides of the DRA to get CP with 10.6% of 3-dB AR bandwidth. 7 Furthermore, wideband CP rectangular DR is investigated when excited with a modified cross slot and a 3-dB AR bandwidth of 24.6% is achieved with the hybrid structure.…”