Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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High-frequency characteristics of short-wavelength transmission line on polyether sulfone thin film for a realization of transparent flexible wireless communication device

투명 플렉시블 무선통신 소자구현을 위한 PES 박막상의 단파장 선로에 대한 고주파 특성연구

  • Yun, Young (Department of Radio Communication and Engineering Korea Maritime and Ocean University)
  • Received : 2016.04.04
  • Accepted : 2016.05.11
  • Published : 2016.05.31
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Abstract

This work presents an investigation of the radio frequency characteristics of an FTLPGS (fishbone-type transmission line employing periodic ground structure) fabricated on PES (polyether sulfone) for the realization of a transparent flexible wireless communication device. According to the results, the FTLPGS on PES showed a shorter wavelength characteristic when compared with a conventional coplanar waveguide. Concretely, the wavelength of the FTLPGS was 1.91 mm at 50 GHz, which was 48.5% of the conventional coplanar waveguide. The bandwidth extraction result showed that the passband of the FTLPGS on PES was 250 GHz. Unlike conventional periodic structures, the characteristic impedance of the FTLPGS on PES also showed a very low frequency dependency. A miniaturization of the RF circuit on the PES substrate was made possible by the FTLPGS on PES having shown characteristic impedance lower than that of conventional transmission lines. These results mean that, with a broadband operation frequency, the FTLPGS on PES is a suitable construction application for the transmission line and distributed passive components.

본 연구에서는 소형화된 투명 플렉시블 무선통신소자 구현을 위해, 주기적 접지구조를 가지는 fishbone 형태의 전송선로를 PES (polyether sulfone) 박막상에 제작하였으며, 이에 관한 RF 특성을 고찰하였다. PES 상의 주기적 접지구조를 가지는 fishbone 형태의 전송선로는 종래의 전송선로에 비해 축소된 파장특성을 보여주었으며, 50 GHz의 주파수에서 선로파장은 1.91 mm으로, 종래의 코프레너 선로의 48.5%이다. 삽입손실 측정결과에 의하면 주기적 접지구조를 가지는 fishbone 형태의 전송선로는 40 GHz 까지의 주파수 범위에서 1.75 dB보다 낮은 저손실특성을 보여주었다. 대역폭 추출결과에 의하면, 주기적 접지구조를 가지는 fishbone 형태의 전송선로는 통과대역이 250 GHz인 광대역 특성을 보였다. 제안된 구조의 전송선로에 대한 특성임피던스 추출결과에 의하면, 제안된 구조의 전송선로는 종래의 주기적 선로구조에 비해 양호한 주파수 특성을 보여주었으며, 이로 인해 광대역의 전송선로 및 광대역 분포형 수동소자에 이용될 수 있음을 알 수 있었다. 그리고, 주기적 접지구조를 가지는 fishbone 형태의 전송선로는 종래의 전송선로에 비해 낮은 임피던스 특성을 보였으며, 이로 인해 좁은 선로폭으로 낮은 특성임피던스를 가지는 선로를 구현할 수 있었으며, 이는 RF 회로상의 점유면적을 줄이는데 크게 기여하였다.

Keywords

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