Design of Lowpass Filter With the Wide Stopband Characteristics Using Microstrip Line

Choi, Dong-Muk; Shim, Joon-Hwan; Jeon, Joongn-sung; Kim, Dong-Il

Journal of Navigation and Port Research 2006;30(5):331-334.
Published online June 30, 2006.

마이크로스트립 선로를 이용한 광대역 차단특성을 가지는 저역통과 필터 설계

최동묵, 심준환, 전중성, 김동일

Design of Lowpass Filter With the Wide Stopband Characteristics Using Microstrip Line

Dong-Muk Choi, Joon-Hwan Shim, Joongn-sung Jeon, Dong-Il Kim

Abstract

In this paper, we designed and fabricated the lowpass filter with the wide stopband characteristics using microp- strip line. Adding the ㅅg/4 open stub at the input and output ports, we developed the L-C ladder type lowpass filter using the open stub which has wide stopband characteristics. In order to reduce the entire size of this filter, the high impedance microstrip lines were made with the meander structure. The lowpass filter was fabricated with the cutoff frequency 2.3 GHz and its measured frequency responses agree well with the simulation results.

Key Words: L-C ladder형 저역통과필터; L-C ladder lowpass filter;Microstrip line;Open stubs