폐루프 공진기를 이용한 3단 필터 (3-POLE BANDPASS FILTER USING CLOSED LOOP RESONATOR)

판매 대리인 : 기율특허

전화번호 : 02-782-1004

메일주소 : kiyul@kiyul.co.kr

영문 원어  : The present invention relates to a three-stage filter using a closed loop resonator, which comprises: a rectangular shape closed-loop resonator having closed four sides; and a series resonator inserted into the center of the closed loop resonator and composed of a lumped element. The closed loop resonator is characterized in that the series resonator is inserted thereinto so as to have two even modes and one odd mode. According to the present invention, the three-stage filter using the closed loop resonator has one odd mode and two even modes by adding the series resonator to a two-stage closed loop resonator to allow an even mode of a resonator to be partitioned into two resonance modes. In addition, according to the present invention, the three-stage filter using the closed loop resonator improves the frequency selectivity and also, improves the frequency flatness by adding the series resonator to the two-stage closed loop resonator to allow a closed loop filter to be in a three-stage resonance mode.