Metamaterial Based Passive Wireless Temperature Sensor

TLDR

The study develops a metamaterial passive wireless temperature sensor comprising an array of closed‑ring resonators embedded in a dielectric matrix, and presents its fabrication, modeling, and testing. The sensor is fabricated by conventional powder compression using a 70 vol % boron nitride/30 vol % barium titanate dielectric matrix with copper washer resonators, and repeatability tests are performed to assess performance. The sensor operates up to 200 °C, with its resonance frequency dropping from 11.93 GHz to 11.85 GHz (sensitivity 0.462 MHz/°C) and exhibiting a maximum standard deviation of 0.012 GHz at 200 °C.

Abstract

This paper presents the fabrication, modeling, and testing of a metamaterial based passive wireless temperature sensor consisting of an array of closed ring resonators (CRRs) embedded in a dielectric material matrix. A mixture of 70 vol% Boron Nitride (BN) and 30 vol% Barium Titanate (BTO) is used as the dielectric matrix and copper washers are used as CRRs. Conventional powder compression is used for the sensor fabrication. The feasibility of wireless temperature sensing is demonstrated up to 200 °C. The resonance frequency of the sensor decreases from 11.93 GHz at room temperature to 11.85 GHz at 200 °C, providing a sensitivity of 0.462 MHz °C. The repeatability of temperature sensing tests is carried out to quantify the repeatability. The highest standard deviation observed is 0.012 GHz at 200 °C.