A Passive Wireless Crack Sensor Based on Patch Antenna with Overlapping Sub-Patch

被引：26

作者：

Xue, Songtao ^{[1
,2
]}

Yi, Zhuoran ^{[1
]}

Xie, Liyu ^{[1
,3
]}

Wan, Guochun ^{[4
]}

Ding, Tao ^{[5
]}

机构：

[1] Tongji Univ, Dept Disaster Mitigat Struct, Shanghai 200092, Peoples R China

[2] Tohoku Inst Technol, Dept Architecture, Sendai, Miyagi 9828577, Japan

[3] Tongji Univ, Minist Educ, Key Lab Performance Evolut & Control Engn Struct, Shanghai 200092, Peoples R China

[4] Tongji Univ, Dept Elect Sci & Technol, Shanghai 200092, Peoples R China

[5] Tongji Univ, Sch Phys Sci & Engn, Inst Precis Opt Engn, Shanghai 200092, Peoples R China

来源：

SENSORS | 2019年 / 19卷 / 19期

关键词：

passive wireless sensor; patch antenna; crack width monitoring; covered radiation patch;

D O I：

10.3390/s19194327

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Monolithic patch antennas for deformation measurements are designed to be stressed. To avoid the issues of incomplete strain transfer ratio and insufficient bonding strength of stressed antennas, this paper presents a passive wireless crack sensor based on an unstressed patch antenna. The rectangular radiation patch of the proposed sensor is partially covered by a radiation sub-patch, and the overlapped length between them will induce the resonate frequency shift representing the crack width. First, the cavity model theory is adopted to show how the resonant frequencies of the crack sensor are related to the overlapped length between the patch antenna and the sub-patch. This phenomenon is further verified by numerical simulation using the Ansoft high-frequency structure simulator (HFSS), and results show a sensitivity of 120.24 MHz/mm on average within an effective measuring range of 1.5 mm. One prototype of proposed sensor was fabricated. The experiments validated that the resonant frequency shifts are linearly proportional to the applied crack width, and the resolution is suitable for crack width measuring.

引用

页数：14