AWR Application Notes

Design and Implementation of a Miniature X-Band Edge-Coupled Microstrip Band Pass Filter

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APPLICATION NOTE Design and Implementation of a Miniature X-Band Edge-Coupled Microstrip BPF Using AWR Software Microwave bandpass filters (BPFs) are the fundamental component used in many RF/microwave applications to eliminate interference from signals operating at nearby frequencies. This application note presents a straightforward and largely nonmathematical method for designing an edge-coupled bandpass filter for X-band operations (8.4- 9.3GHz). The flow combines filter synthesis, closed-form edge-coupled transmission-line models, and electromagnetic (EM) analysis using the Cadence ® AWR ® Microwave Office ® circuit simulator within Cadence AWR Design Environment ® software. Design Overview A miniature X-band, edge-coupled microstrip bandpass filter design example demonstrates this flow. The filter was imple- mented using edge-coupled microstrip lines on a Rogers RO4003 substrate material with Er = 3.66 and H = 8 mil. The temperature coefficient of dielectric constant was among the lowest of any circuit board material, and the dielectric constant was stable over a broad frequency range, specifically at X-band frequencies. The simulated results showed good filter response characteristics with the passband insertion loss approximately 5 dB and return loss greater than 12dB over the pass bandwidth of 900MHz.

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