Investigation on a 220 GHz Quasi-Optical Antenna for Wireless Power Transmission

Meng Han,Xiaotong Guan,Wenjie Fu,Yang Yan,Moshe Einat

doi:10.3390/electronics10050634

Meng Han, Xiaotong Guan + Show 3 more

Open Access

https://doi.org/10.3390/electronics10050634

Copy DOI

Abstract

This paper investigates a 220 GHz quasi-optical antenna for millimeter-wave wireless power transmission. The quasi-optical antenna consists of an offset dual reflector, and fed by a Gaussian beam that is based on the output characteristics of a high-power millimeter-wave radiation source-gyrotron. The design parameter is carried on by a numerical code based on geometric optics and vector diffraction theory. To realize long-distance wireless energy transmission, the divergence angle of the output beam must be reduced. Electromagnetic simulation results show that the divergence angle of the output beam of the 5.6 mm Gaussian feed source has been significantly reduced by the designed quasi-optical antenna. The far-field divergence angle of the quasi-optical antenna in the E plane and H plane is 1.0596° and 1.0639°, respectively. The Gaussian scalar purity in the farthest observation field (x = 1000 m) is 99.86%. Thus, the quasi-optical antenna can transmit a Gaussian beam over long-distance and could be used for millimeter-wave wireless power transmission.

Highlights

Microwave power transmission (MPT), as a feasible solution for long-distance wireless power transmission, has attracted much attention for many potential applications, such as space solar power generation [1,2], continuous high-altitude relay platforms [3,4], etc.Compared to microwaves, millimeter waves have higher frequencies and better beam directivity [5], which are considered more conducive to long-distance wireless energy transmission applications
This paper proposes an offset Cassegrain dual reflector scheme, which uses 220 GHz gyrotron output Gaussian beam as the feed source to form together with a quasi-optical antenna structure
This paper presented a quasi‐optical for its application in wireless power transmission

Summary

Introduction

Millimeter waves have higher frequencies and better beam directivity [5], which are considered more conducive to long-distance wireless energy transmission applications. Due to the lack of high efficiency and high power millimeter-wave source (such as magnetron in the microwave region), the investigations on millimeter-wave power transmission are limited. Unlike the traditional vacuum electronic devices utilizing slow-wave circuits as their interaction structures, gyrotron is a fast-wave device that has much larger physical dimensions than the operating wavelength. It has higher output power and higher efficiency than traditional vacuum electronics devices in the millimeter-wave region [12,13]

Methods

Findings

Discussion

Conclusion