title: Design of a 75-140 GHz high-pass printed circuit board dichroic filter.
abstract: A new high-performing PCB (Printed Circuit Board) dichroic filter, which can be used for the KSTAR (Korea Superconducting Tokamak Advanced Research) electron cyclotron emission imaging system, is proposed. The current dichroic filter consists of a triangular lattice array of circular holes on the 6-mm thick metal plate, while circular hole spacing limitation caused relatively narrow passband (∼20 GHz). On the other hand, the proposed PCB dichroic filter utilizes the inexpensive commercial PCB fabrication process with a flexible adjustment of circular hole spacing. Therefore, the proposed PCB dichroic filter provides significantly wider passband (∼60 GHz with 0.84 dB insertion loss) with much reduced weight and expense. Also, it is shown that a steep skirt property can be obtained with the thick PCB filter substrate. The design process, fabrication, and measurement results of the new PCB dichroic filter are described.
authors.affiliation: School of Electronics Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, 41566 Daegu, South Korea.
authors.forename: Dong Hwi
authors.identifier: 0000000238403054
authors.initials: DH
authors.lastname: Kim
authors.affiliation: School of Electronics Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, 41566 Daegu, South Korea.
authors.forename: Wahab
authors.initials: W
authors.lastname: Mohyuddin
authors.affiliation: Department of Aviation Information and Communications Engineering, Kyungwoon University, 730, Gangdong-ro, Sandong-myeon, 39160 Gumi, South Korea.
authors.forename: Dong Sik
authors.initials: DS
authors.lastname: Woo
authors.affiliation: School of Electronics Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, 41566 Daegu, South Korea.
authors.forename: Hyun Chul
authors.initials: HC
authors.lastname: Choi
authors.affiliation: School of Electronics Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, 41566 Daegu, South Korea.
authors.forename: Kang Wook
authors.initials: KW
authors.lastname: Kim