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Georgia Journal of Science

Article Title

DESIGN AND TESTING OF MICROSTRIP RESONATOR-BASED BAND PASS FILTER

Abstract

Any electronic device that receive signal such as cell phone, radar, television etc. need a bandpass filter which is considered as the heart of that device. Bandpass filters are fabricated by placing several identical resonators close to each other such that resonators can have electromagnetic coupling among those. In this research, two microstrip resonators are modeled in 3D electromagnetic simulation software HFSS and coupling between those are ensured by placing those side by side (edge coupling) or by placing those one above another (broadside coupling). Coupling coefficient between those resonators is determined for both cases. For each case, external Q factor is also determined to understand the impedance matching between filter and external circuit. Calculated coupling coefficient and external Q factor is then used to design Narrow band pass (edge coupling) and Wide band pass (broadside coupling) filter. According to the design parameter, band pass filter is simulated and tested. Simulation result shows that, filter properties, in terms of center frequency and fractional bandwidth, are in good agreement with the design values.

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