Abstract

A compact elliptic-function lowpass filter is developed. Multiple cascaded microstrip hairpin resonators operated at different 3-dB cutoff frequencies are used to design the filter. The filters are evaluated by experiment and simulation with good agreement. The return loss is better than 12.84 dB from DC to 0.81 GHz. The insertion loss is less than 0.5 dB. The rejection is greater than 35.7 dB from 1.5 to 10 GHz. This compact, low loss, sharp cutoff frequency response, and broad stopband lowpass filter should be useful in many wireless communication systems.

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