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Abstract
This paper presents an improved bandpass filter based on Stepped-Impedance Resonator (SIR) working in millimeter-wave band. Compared to the conventional E-plane waveguide bandpass filter, it can be integrated in the planar circuits easily with more compact size. A new coupling structure is proposed which has increased the coupling coefficient of the 1st and 5th stages at the limitation of fabricating craft in millimeter-wave band. The distorted structure of the microstrip reduces the insertion loss of the filter. The relative analysis is given, and the simulation results are compared with those of traditional structure. Computer-aided design of such a Ka-band filter has been presented. Good agreement has been observed between theory and measurement.