The sensor was designed and fabricated using a printed circuit board (PCB) technique based on a negative dry film photoresist and photolithography method. The microstrip patch sensor, which has a low cost and simple build process, consists of a circular split ring resonator (SRR) with a hole drilled through the substrate in the middle area, and a microstrip patch antenna. Ī non-contact method for detecting salt concentration in water using a microstrip patch sensor is presented in this work. Planar microwave resonant sensors can be classified into several groups according to different conditional criteria such as variation in frequency, variation in phase, splitting in frequency, couplingmodulation, and differential-mode. Microwave sensors have many advantages such as being simple and easy to design, compact size, wide dynamic range, high linearity, low cost, high resolution and sensitivity, resistant to the environment, non-invasive and non-destructive, wireless sensing, good compatibility with other technologies, etc. ![]() They have been applied in fields such as agriculture, health, food, pharmaceutical, medical, environmental, and energy, among others. An important reason for this is that planar microwave sensors are highly sensitive to the properties of matter and the materials they interact with, and they feature a low cost, design simplicity, ease of fabrication, compact size, robustness, and compatibility with other technologies, such as integration with the associated circuits and electronic devices, they can be implemented in flexible and compostable substrates, and they work with microfluidic systems.
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