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A miniature microstrip stepped impedance lowpass filter and coupled resonator bandpass filter diplexer has been developed. The merit of the circuit lies in the simplicity of the design procedure and the simplicity of the simulation with most commercial soft ware packages. The matching circuit design of a lowpass bandpass diplexer may be a challenge in conventional designs because wideband (from zero to approximately the cutoff frequency of the lowpass filter) open circuit condition is required to be achieved in bandpass channel circuit. The measured results are in good agreement with the simulated response.

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