公开(公告)号：US20180108963A1

公开(公告)日：2018-04-19

申请号：US15462000

申请日：2017-03-17

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seong Mo MOON ,  In Bok YOM ,  Moon-Que LEE

IPC: H01P1/201 ,  H01P5/12 ,  H01P1/18 ,  H01P1/22

CPC classification number: H01P1/201 ,  H01P1/00 ,  H01P1/18 ,  H01P1/22 ,  H01P5/12 ,  H03H7/00

Abstract: Provided is a microwave filter system having a feedback structure. The microwave filter system may include an input hybrid coupler configured to output first output signals having a phase difference with respect to an input signal; filters disposed to be in parallel with an output end of the input hybrid coupler, and configured to filter the first output signals; and an output hybrid coupler configured to output second output signals having a phase difference with respect to each of signals filtered through the filters. An output signal of the output hybrid coupler is applied to an input end of the input hybrid coupler along a feedback path.