公开(公告)号：US20230268628A1

公开(公告)日：2023-08-24

申请号：US18305090

申请日：2023-04-21

申请人： Inter-University Research Institute Corporation, National Institutes of Natural Sciences

发明人： Masaki NISHIURA ,  Takashi SHIMIZU ,  Sakuji KOBAYASHI ,  Shin KUBO

IPC分类号： H01P1/207

CPC分类号： H01P1/207

摘要： The present disclosure aims to improve the performance of a notch filter using a rectangular waveguide and a cavity. A notch filter has a rectangular opening that is formed in an end face thereof. Inside of the notch filter, a waveguide is connected with circular cavities and by connecting pipes. In a planar shape of the waveguide, from an inlet side thereof, a wide path portion, a tapered portion and a narrow path portion are formed and are further connected with a tapered portion and a wide path portion. The circular cavities and designed according to the frequency of the electromagnetic wave that is to be trapped are provided in the middle of the narrow path portion. The configuration of decreasing the width of the waveguide in a location where the circular cavities are provided improves the performance of removal of the electromagnetic wave by the circular cavities.