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.
Highlights
As a future and eco-friendly energy source, researches on nuclear fusion are world-widely investigated
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
A new high-performing W/F-band PCB dichroic filter, which can be used for the KSTAR electromagnetic waves are radiated (ECE) imaging system, is proposed
Summary
As a future and eco-friendly energy source, researches on nuclear fusion are world-widely investigated. In KSTAR, the ECEI system measures the radiated W/F-band signals (75-130 GHz) from plasma, and a high-pass dichroic filter is used to block lower frequency components, ensuring a single-sided heterodyne mixing of RF and LO signals for the system.. Dichroic filters were used to pass selective frequencies in satellite communications and to bandpass the desired frequencies in multipliers.. Dichroic filters were used to pass selective frequencies in satellite communications and to bandpass the desired frequencies in multipliers.3 These dichroic filters were used to protect the measurement system and tailored for the specific purposes. In the KSTAR ECEI/MIR system, a dichroic filter and a notch filter are used to protect the system and select the required EM spectrum from the tokamak radiated signals.. The proposed Printed Circuit Board (PCB) dichroic filter, which uses commercial PCB process, significantly enhances the passband frequencies with lower insertion loss and reduces weight and expense with flexible design and fabrication options
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