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This letter proposes a two-path mixed coupling tunable bandpass filter with constant bandwidth. This compact configuration can achieve little bandwidth variation in a large tuning range. Presented with the equivalent circuit of the coupling structure, the analytical formulas of the two-path mixed coupling structure are derived to determine the initial dimensions of the resonator quickly. Furthermore,...
This paper presents the design of a compact dual mode dual-band microstrip filter. A dual mode resonator is proposed based on the concept of SIR. The dual band filter can support CDMA and WiFi simultaneously. The measured results show that insertion loss are 0.62 dB and 1.2 dB at 0.85GHz and 2.46GHz respectively which are in excellent agreement with simulation.
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