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.
Highlights
With the rapid growth of portable electrical devices, wireless power transfer (WPT) is on the forefront of electronics technology [1,2,3]
We propose a wideband circularly polarized (CP) antenna using a pixelated dielectric resonator (DR) which is discretized into 8 × 8 grid DR bars with different heights
The DR was discretized into 8 × 8 grid DR bars with different heights, with the heights optimized by a real-coded genetic algorithm (GA) to realize circular polarization
Summary
With the rapid growth of portable electrical devices, wireless power transfer (WPT) is on the forefront of electronics technology [1,2,3]. With WPT using the near-field inductive coupling technique, power is transmitted by magnetic inductive coupling between transmitting and receiving coils or wires. This technique is only capable of transferring power over short distances. With WPT based on the far-field RF technique (referred to as far-field WPT), power is transmitted by electromagnetic radiation, which allows the transfer of electrical energy over longer distances. This feature makes the far-field method an attractive WPT option [4]. An aperture-coupled feeding technique through a narrow rectangular slot is used to excite the proposed antenna.
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