Abstract
A bandpass fllter is designed using two end-connected quarter-wavelength stepped impedance resonators. The quarter-wavelength stepped impedance resonators are implemented by a half-wavelength stepped impedance resonator with its middle shorting to ground. Hence, the modes that the ‚=4 stepped impedance resonator supports are the (1+2n)=4 which also occur on the branches of a combline. An enhanced U-shape coupling feed is adopted in the fllter design to reduce the insertion losses as well as suppressing the harmonics. The proposed fllter has a quasi-elliptic frequency response. An equivalent circuit model is developed and the experiments are conducted for circuit design veriflcation.
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