Liquid Level Measurement Using Sensors with Microstrip Parallel Coupled Lines

This research demonstrated the design technique and sensor building for liquid level measurement by applying microstrip parallel coupled lines. The design and building of the coupled line with a microstrip had coupling at -10 dB and 200 MHz of frequency. The water level for testing was 0-20 cm to check the frequency response of the coupling from 100 MHz -1.5 GHz. In accordance with the experiment, it was found that coupling with different levels of water provided the same result. This technique was easy to follow as the sensor had a small size and was inexpensive.