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Sensors 2017, 17(4), 665;

A Passive Temperature-Sensing Antenna Based on a Bimetal Strip Coil

State Key Laboratory on Microwave and Digital Communications, Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
Author to whom correspondence should be addressed.
Received: 16 December 2016 / Revised: 20 March 2017 / Accepted: 20 March 2017 / Published: 23 March 2017
(This article belongs to the Section Physical Sensors)
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A passive temperature-sensing antenna is presented in this paper, which consists of a meandering dipole, a bimetal strip and a back cavity. The meandering dipole is divided into two parts: the lower feeding part and the upper radiating part, which maintain electric contact during operation. As a sensing component, a bimetal strip coil offers a twisting force to rotate the lower feeding part of the antenna when the temperature varies. As a result, the effective length of the dipole antenna changes, leading to a shift of the resonant frequency. Furthermore, a metal back cavity is added to increase the antenna’s quality factor Q, which results in a high-sensitivity design. An antenna prototype is designed, fabricated, and measured, which achieves a sensitivity larger than 4.00 MHz/°C in a temperature range from 30 °C to 50 °C and a read range longer than 4 m. Good agreement between the simulation and measurement results is obtained. View Full-Text
Keywords: reconfigurable sensing antenna; temperature sensing; high sensitivity; bimetal strip reconfigurable sensing antenna; temperature sensing; high sensitivity; bimetal strip

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Shi, X.; Yang, F.; Xu, S.; Li, M. A Passive Temperature-Sensing Antenna Based on a Bimetal Strip Coil. Sensors 2017, 17, 665.

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