Long-Range Displacement Meters Based on Chipped Circular Patch Antenna

Sensors

Shuai Guan¹  Songtao Xue¹  Kang Jiang¹  Liyu Xie¹  Guochun Wan²  Chunfeng Wan³ 

[1] Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China;Department of Electronic Science and Technology, Tongji University, Shanghai 200092, China;Southeast University, Key Laboratory of concrete and pre-stressed concrete structure of Ministry of Education, Nanjing 210096, China;

关键词: displacement sensor;    circular patch antenna;    resonant frequency;    sloping channel;   

DOI  :  10.3390/s20174884

来源: DOAJ

【 摘 要 】

This paper presents a passive wireless long-range displacement sensor that is based on the circular patch antenna, and the detecting range of the sensor can be customized. The sensor consists of a chipped circular antenna with two opened rectangular windows, a substrate, and a ground plate with a sloping channel. No bonding between the antenna and the ground plate allows for the chipped antenna to slide along the sloping channel. The channel will drive the current flow on the plate once the chip is activated, increasing the effective electrical length and, consequently, decreasing the resonant frequency of the circular antenna. The sensing mechanism equates the measuring displacement to the relative movement of the antenna with respect to the ground that achieves the measurement of long-range displacement and, thus, the proposed sensor can avoid stress damage to the antenna due to excessive deformation. Three different range sensors were simulated in the the Ansoft high frequency structure simulator (HFSS). The results show that the resonance frequency of the antenna has a linear relationship with the varying chute depth beneath the chip. Three sensors were fabricated, and the experimental results also validated that the sensitivity of the sensor can be adjusted.

【 授权许可】

Unknown