• Title/Summary/Keyword: RF Loss

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RF Loss Minimization Method Using High Impedance Filter for Research (High Impedance Filter를 이용한 RF Loss 최소화 방법에 대한 연구)

  • Wang, Hyun-Chul;Seo, Hwa-Il
    • Journal of the Semiconductor & Display Technology
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    • v.19 no.1
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    • pp.55-60
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    • 2020
  • This study designed High impedance filter to reduce RF loss to heater heating wire and increase RF current flowing to heater ground wire. Effects such as D / R improvement and process reproducibility could be seen. In addition, RF parameter distribution optimization was possible by understanding the RF path of PE-CVD equipment using Plasma and designing filter.

Thermal and Stress Analysis of The Faraday Shield in KSTAR ICH System

  • Yoon, B.J.;Han, J.M.;Jeong, S.H.;Yoon, J.S.;Hong, B.G.
    • Proceedings of the Korean Nuclear Society Conference
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    • 1998.05b
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    • pp.935-940
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    • 1998
  • The Korea Superconducting Tokamak Research (KSTAR) tokamak will have 6 MW of radio-frequency (rf) heating in the ion cyclotron range of frequencies (ICRF). The response of the antenna to the heat loads is analyzed and the resulting stresses in the Faraday shield during the normal operation is calculated. Various heat loading conditions including in the analyzes are the heat loads from the plasma, the ripple-trapped beam particles and the rf loss.

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A Study on Configuration of True Time Delay Phase Shifter for Wideband Beam Steering Phased Array Antenna (광대역 빔 조향을 위한 위상 배열 안테나의 실시간 지연 위상 천이기 구성에 관한 연구)

  • Jung, Jinwoo;Ryu, Jiho;Park, Jaedon;Seo, Jongwoo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.20 no.3
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    • pp.413-420
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    • 2017
  • We investigate the performance of a true time delay(TTD) phase shifter to reduce the beam squint caused by frequency changes of a phased array antenna in wideband communication systems. To design a high gain phased array antenna, we need a long TTD, which causes high RF loss, low resolution and large dimension of TTD phase shifters. To overcome the problems, we propose a schematic of dual TTD phase shifters, which consists of short time delay(STD) in radio frequency(RF) part and long time delay(LTD) in intermediate frequency(IF) part. Our analysis results show that the proposed scheme reduces the required bits and delay time in RF band of the TTD compared to the conventional single TTD scheme.