Enhancing Microwave Heating Uniformity in Cavities Using a 2-bit Coding Metasurface

TL;DR

This paper introduces a 2-bit coding metasurface that improves microwave heating uniformity in cavities by scattering waves into multiple directions, validated through simulations and experiments.

Contribution

It presents a novel 2-bit coding metasurface design that enhances heating uniformity without cavity redesign or power modification.

Findings

Reduced temperature coefficient of variation from 0.694 to 0.461

Simulated and measured temperature distributions show strong agreement

Improved electric field distribution uniformity in microwave heating

Abstract

A novel method for enhancing microwave heating uniformity using a 2-bit coding metasurface is proposed. This metasurface is specially designed to scatter incident waves into multiple directions at 2.45 GHz rather than just one, significantly improving the electric field distribution uniformity within a cavity, and eliminating the need to redesign the cavity itself or modify the power excitation. Simulated results demonstrate a reduction in the coefficient of variation (COV) of potato temperature from 0.694 to 0.461, indicating enhanced heating uniformity while maintaining efficiency. Additionally, the measured potato temperatures show excellent agreement with the simulated results, validating the effectiveness of the proposed method.