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Design and Implementation of Lowpass Bandpass Diplexer

Jolis Gupta, Deshraj Shakya

A novel approach for miniaturised microstrip SIR lowpass filter and copled line banspass filter has been proposed. The matching circuit involved is a simple L shaped microstrip line.This has replaced the simple H- plane Tee involved in the previous papers. The microwave tees although simple introduces signicant loading of the lowpass circuit. The lowpass filter is an open circuited fifth order lowpass filter while the bandpass filter is a hybrid staircase shaped coupled resonator filter The measured results are in good agreement with the simulated responses.Different components proposed in this diplexer have been designed on the HFSS software.