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Sensors 2018, 18(1), 310; https://doi.org/10.3390/s18010310

A Circular Microstrip Antenna Sensor for Direction Sensitive Strain Evaluation

Department of Electrical and Computer Engineering, West Pomeranian University of Technology, ul. Sikorskigo 37, Szczecin 70-313, Poland
This paper is an expanded version of our paper published in Lopato, P.; Herbko, M. Direction sensitive deformation measurement by circular microstrip sensor. In Proceedings of the 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering (ISEF), Lodz, Poland, 14–16 September 2017.
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Received: 6 December 2017 / Revised: 9 January 2018 / Accepted: 17 January 2018 / Published: 20 January 2018
(This article belongs to the Special Issue Small Devices and the High-Tech Society)
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Abstract

In this paper, a circular microstrip antenna for stress evaluation is studied. This kind of microstrip sensor can be utilized in structural health monitoring systems. Reflection coefficient S11 is measured to determine deformation/strain value. The proposed sensor is adhesively connected to the studied sample. Applied strain causes a change in patch geometry and influences current distribution both in patch and ground plane. Changing the current flow in patch influences the value of resonant frequency. In this paper, two different resonant frequencies were analysed because in each case, different current distributions in patch were obtained. The sensor was designed for operating frequency of 2.5 GHz (at fundamental mode), which results in a diameter less than 55 mm. Obtained sensitivity was up to 1 MHz/100 MPa, resolution depends on utilized vector network analyser. Moreover, the directional characteristics for both resonant frequencies were defined, studied using numerical model and verified by measurements. Thus far, microstrip antennas have been used in deformation measurement only if the direction of external force was well known. Obtained directional characteristics of the sensor allow the determination of direction and value of stress by one sensor. This method of measurement can be an alternative to the rosette strain gauge. View Full-Text
Keywords: microstrip sensor; microstrip antenna; microwave technique; structural health monitoring; deformation measurement; strain measurement; finite element method microstrip sensor; microstrip antenna; microwave technique; structural health monitoring; deformation measurement; strain measurement; finite element method
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Lopato, P.; Herbko, M. A Circular Microstrip Antenna Sensor for Direction Sensitive Strain Evaluation. Sensors 2018, 18, 310.

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