Design, Development, and Analysis of Spiral Microstrip Resonator Filter

The study presents the design, simulation, and analysis of an electromagnetically coupled spiral resonator. The reflection and transmission characteristics of the spiral resonator coupled to a 50Ω microstrip line is studied in detail. The influence of geometric design and substrate parameters are analysed and design equations are derived. The presented design equations predicts the resonance frequency with an error less than 3%. A protype of the resonator is fabricated and the experimental analysis is carried out. The RFID tags and sensors can both be made with this spiral resonator sensor.