Wireless passive high-temperature sensor based on multifunctional reflective patch antenna up to 1050 degrees centigrade

    Authors

    H. T. Cheng; S. Ebadi; X. H. Ren;X. Gong

    Comments

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    Abbreviated Journal Title

    Sens. Actuator A-Phys.

    Keywords

    Harsh environment; Microwave sensor; Reflective patch antenna; Wireless; passive temperature sensor; RESONATOR/ANTENNA; TECHNOLOGY; Engineering, Electrical & Electronic; Instruments & Instrumentation

    Abstract

    A novel wireless passive temperature sensor based on a reflective patch is demonstrated up to 1050 degrees C herein. This reflective patch acts as a patch resonator (temperature sensor) and an integrated antenna at the same time. The temperature sensing mechanism is the monotonic increase of the dielectric constant of alumina versus temperature, which reduces the resonant frequency of a patch resonator formed on such an alumina substrate. By properly designing the shape and dimensions of the patch, it can also act as a transmit/receive antenna for wireless passive sensing. Therefore, temperatures can be wirelessly sensed by measuring the resonant frequency of the temperature sensor using an interrogation antenna. This temperature sensor uses robust alumina and platinum materials for high-temperature applications. In addition, this wireless passive temperature sensor is simple in mechanical structure and low in profile, with the potential to be in conformal shape. A temperature sensor using this reflective patch was designed, fabricated and tested from 50 to 1050 degrees C in ambient. The resonant frequency of the sensor decreases from 5.07 to 4.58 GHz, which corresponds to a dielectric constant change from 9.7 to 11.4 for the alumina substrate. The temperature measurement sensitivity is found to be 0.58 MHz/degrees C at 1050 degrees C. Being wireless, passive, planar and low profile, the proposed high-temperature sensor can be used for various harsh-environment applications. (C) 2014 Elsevier B.V. All rights reserved.

    Journal Title

    Sensors and Actuators a-Physical

    Volume

    222

    Publication Date

    1-1-2015

    Document Type

    Article

    Language

    English

    First Page

    204

    Last Page

    211

    WOS Identifier

    WOS:000349573400024

    ISSN

    0924-4247

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