Studies on the Microstrip Bandpass Filter Using Stepped Impedance Resonator and the Wideband Microstrip Bandpass Filter

스텝 임피던스 공진기를 이용한 마이크로스트립 대역통과 필터와 광대역 마이크로스트립 대역통과 필터에 관한 연구

A microstrip bandpass filter using stepped impedance resonators and tapped input / output is realized with Teflon substrate, whose center frequency is 3.5 GHz and fractional bandwidth is 20%. In order to realize a wider bandwidth of 30%, the Crystal's design method and the input / output tapping scheme are used. Another microstrip filter designed as mentioned above is realized with Epsilam-10 substrate. This case shows good agreement between the theoretical responses and the measured ones.