Experimental study on an S-band near-field microwave magnetron power transmission system on hundred-watt level

TL;DR

This paper demonstrates a near-field microwave power transmission system at 2.45 GHz using multi-magnetron sources, a metamaterial antenna, and a large rectenna array, achieving over 67 W DC power at 5.5 meters.

Contribution

It introduces a novel system combining multi-magnetron sources with a metamaterial antenna and a large rectenna array for efficient microwave power transmission.

Findings

DC output power of 67.3 W at 5.5 m distance

Effective use of low power Schottky diodes for high power transmission

Transmission mode and load significantly affect power output

Abstract

A multi-magnetron microwave source, a metamaterial transmitting antenna, and a large power rectenna array are presented to build a near-field 2.45 GHz microwave power transmission system. The square 1 m2 rectenna array consists of sixteen rectennas with 2048 Schottky diodes for large power microwave rectifying. It receives microwave power and converts them into DC power. The design, structure, and measured performance of a unit rectenna as well as the entail rectenna array are presented in detail. The multi-magnetron microwave power source switches between half and full output power levels, i.e. the half-wave and full-wave modes. The transmission antenna is formed by a double-layer metallic hole array, which is applied to combine the output power of each magnetron. The rectenna array DC output power reaches 67.3 W on a 1.2 ohm DC load at a distance of 5.5 m from the transmission antenna. DC output power is affected by the distance, DC load, and the mode of microwave power source. It shows that conventional low power Schottky diodes can be applied to a microwave power transmission system with simple magnetrons to realise large power microwave rectifying.