volume | PIER Journals

Abstract

Microwave wireless power transfer (MWPT) offers significant advantages for charging unmanned vehicles over distances on the order of 100 m in atmospheric environments. To accurately measure the beam efficiency in field experiments, it is critical to suppress the impact of ground reflection on the field distribution generated by the beam. This paper presents the design of a compact wave-absorbing plate. The plate is composed of two dielectric waveguides arranged in an alternating side-by-side configuration. One waveguide is periodically loaded with metal patches along the propagation direction to absorb horizontally polarized incident waves, while the other is designed to absorb vertically polarized waves. Slots on the top surface are employed to couple the incident wave energy into the waveguides. Simulation results indicate that at 10 GHz, the reflection coefficients for both horizontal and vertical polarizations remain below -20 dB for incident angles ranging from 60° to 75°. In terms of volume, the proposed absorber achieves an 85% reduction in absorbing material consumption compared with conventional structures. It can be obliquely deployed on the ground as an array along the propagation path of the microwave beam to effectively attenuate ground reflection.

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Dr. Hehui Zhang

Dr. Xiaoqin Zhu

Dr. Dapeng Guo

Dr. Enze Zhang