Modeling and development of radio frequency planar interdigital electrode sensors

Muhammad Farhan Affendi bin Yunos (International Islamic University Malaysia)
Anis Nurashikin Nordin (International Islamic University Malaysia)
Anwar Zainuddin (International Islamic University Malaysia)
Sheroz Khan (International Islamic University Malaysia)

Bulletin of Electrical Engineering and Informatics
Vol 8, No 3: September 2019

The interdigital sensor has been implemented in various field of applications such as microwave device, chemical sensor and biological sensor. This work describes the design and fabrication of an interdigital sensor (IDS) design that has the potential of estimating blood glucose levels using capacitive measurements. The IDS was first designed using theoretical equations and later was optimized by using CST Microwave Studio®. The electrode widths of the sensor were varied from 0.5mm to 0.7mm and the S11 reflection characteristics were simulated.Upon completion of simulations, the sensor was fabricated using copper clad FR4 boards. The fabricated sensors were measured using a vector network analyzer (VNA) and produced resonance frequencies of 2.02, 2.11 and 2.14 GHz. The highest Q obtained was 11.72 from the 2.11 GHz sensor.