A Wideband Circularly Polarized Pixelated Dielectric Resonator Antenna

Abstract

The design of a wideband circularly polarized pixelated dielectric resonator antenna using a real-coded genetic algorithm (GA) is presented for far-field wireless power transfer applications. The antenna consists of a dielectric resonator (DR) which is discretized into 8 × 8 grid DR bars. The real-coded GA is utilized to estimate the optimal heights of the 64 DR bars to realize circular polarization. The proposed antenna is excited by a narrow rectangular slot etched on the ground plane. A prototype of the proposed antenna is fabricated and tested. The measured −10 dB reflection and 3 dB axial ratio bandwidths are 32.32% (2.62–3.63 GHz) and 14.63% (2.85–3.30 GHz), respectively. A measured peak gain of 6.13 dBic is achieved at 3.2 GHz.

Vertical-Strip-Fed Broadband Circularly Polarized Dielectric Resonator Antenna

“…Finally, a performance comparison of the proposed work is presented in relation to earlier published works [ 7 , 8 , 9 , 10 , 11 ]. This comparison is shown in Table 2 .…”

“…This comparison is shown in Table 2 . It can be seen that the proposed work has a wider −10 dB reflection bandwidth and a 3 dB ARBW along with more compact dimensions as compared to the other DRAs [ 7 , 8 , 9 ]. Another work [ 10 ] utilizes a modified microstrip feed to excite a cubic DR, and has dimensions of 0.44 × 0.44 × 0.21 ( corresponds to the center frequency of the 3 dB ARBW).…”

“…In one study [ 6 ], the combination of a modified cross-slot and a rectangular DR yielded a 3 dB ARBW of 24.6%. Another method involved the design of special-shaped DRs which by virtue of their shape produced a broad 3 dB ARBW while using simple feeding technique [ 7 , 8 , 9 ]. For example, a pixelated DR fed through a rectangular slot was presented, demonstrating a 3 dB ARBW of 14.63% [ 7 ].…”

“…Another method involved the design of special-shaped DRs which by virtue of their shape produced a broad 3 dB ARBW while using simple feeding technique [ 7 , 8 , 9 ]. For example, a pixelated DR fed through a rectangular slot was presented, demonstrating a 3 dB ARBW of 14.63% [ 7 ]. In another study [ 8 ], a multiple-circular-sector DR excited through a rectangular slot exhibited a 3 dB ARBW of 19.3%.…”

Broadband Circularly Polarized Slot Antenna Loaded by a Multiple-Circular-Sector Patch

“…In order to achieve high resolution images, sensitive antennas are used for electric-field mapping of short-time microwave pulses. Due to the capability of mitigating multipath propagation effects and providing better flexibility with regard to the orientation angle between the transmitter and receiver, circularly polarized (CP) antennas are a very desirable feature in microwave imaging sensing systems and communication applications [ 1 , 2 , 3 , 4 , 5 ]. In recent years, with the rapid development of modern wireless communications, the demand for broadband CP antennas has increased considerably.…”