• Title/Summary/Keyword: Iris Polarizer

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Design of A Dual-Band Square Waveguide Iris Polarizer (이중대역 정사각형 도파관 아이리스 편파기 설계 기법)

  • 황순미;윤소현;김영민;최종성;김도균;안병철
    • Proceedings of the IEEK Conference
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    • 2002.06a
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    • pp.443-446
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    • 2002
  • In this paper, we present a new design method for a square iris polarizer to be used in dual-band (Ka-band; 20.8 ~21.2 ㎓, 30.6~31 ㎓) antenna feeds. Principles of operation of a square iris polarizer, its design concepts and methods are proposed. Based on proposed methods, a Ka- band polarizer with -35 dB return loss and 0.3 dB axial ratio is designed using the commercial software HFSS.

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Design of a Dual-Band Square-Waveguide Iris Polarizer (이중대역 정사각형 도파관 아이리스 편파기 설계)

  • Hwang Soon-Mi;Ko Han-Woong;Park Dong-Hee;Yun So-Hyeun;Uhm Man-Seok;Ahn Bierng-Chearl
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.2 s.93
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    • pp.113-119
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    • 2005
  • In this paper, we present methods for designing a square-waveguide iris polarizer operating at dual frequency bands. Methods are presented fur determining the number of ires, iris thickness, iris height and spacing between ires so that the input reflection is low and the axial-ratio bandwidth is optimized at two frequency bands. As an example of the application of the proposed method, a polarizer operating at 21 GHz and 31 GHz bands is designed, fabricated and tested. The fabricated polarizer shows a reflection coefficient less than -35 dB and an axial ratio less than 0.3 dB at $20.8\~21.2\;GHz$ and $30.6\~31.0\;GHz$.

Analysis and Design of Waveguide Iris Polarizer for Rotation of Polarization Plane (편파면 회전을 위한 도파관 아이리스 편파기 설계 분석)

  • Yang, Doo-Yeong;Lee, Min-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.7
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    • pp.3201-3206
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    • 2012
  • In this paper, the simplified design methodology for rotation of polarization plane using a square waveguide is proposed. In order to optimize the characteristics of $180^{\circ}$ polarizer operating from 14.3GHz to 14.8GHz in Ku-band, the modified mode matching method and piecewise power tower interpolation are applied to the polarizer design. The optimized results show that the frequency bandwidth in VSWR<2 has covered 500MHz in the Ku-band and phase difference between two orthogonal modes $TE_{10}$and $TE_{01}$ is $180^{\circ}{\pm}1^{\circ}$ in the range of 14.3GHz~14.8GHz. The cross polarization loss has obtained below 40dB and the insertion loss has 0.1dB in the passband. Therefore, the proposed polarizer is suitable for practical Ku-band system requiring the low VSWR and compact size.

Design and Manufacture of a Dual Mode Waveguide Filter Loading On the Satellite (인공위성 탑재용 이중모드 도파관 필터 설계 및 제작에 관한 연구)

  • 고영목;강원준;한수용;박종화;김춘길;라극환
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.30A no.10
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    • pp.1-11
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    • 1993
  • A narrow-band dual TE$_{111}$ mode circular waveguide filter for Ku-Band satellite transponder was designed and manufactured based on a new model of the filter. We calculated the cavity size, pin polarizer depth and diameter, iris length and width, and used Bethe's Small Diffraction Theory and Chon's Correction Formular in order to obtain exact Result for each cavity. The designed dual model waveguide filter was manufactured with invar in order to maintain the thermal stability, and the filter performance was improved through the thermal test and vibration test to endure in the cosmic environment.

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The Antenna Design for Korea SAT-5 Satellite Communication in Ka-band (무궁화 5호 위성통신용 Ka대역 안테나 설계)

  • Kim, Chun-Won;Cheong, Chi-Hyun;Kim, Kun-Woo;Lee, Seong-Jae
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.42 no.1
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    • pp.90-97
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    • 2014
  • In this paper, we have designed the antenna for Korea SAT-5 Satellite Communication which can use Ka band in the earth station. The antenna structure consist of the the dual-offset gregorian reflector that has high gain and efficiency, the corrugated horn that has symmetric radiation patterns and low side lobe levels, the iris polarizer that make circular polarization and the OrthoMode Transducer that separate transmitting and receiving signals. The designed antenna gain is more than 45.7dBi in Tx-band which use LHCP and 42.0dBi in Rx-band which use RHCP. The co-polarized and cross-polarized radiation pattern comply with ITU-R S.580-6 and S.731-1 that are recommended by International Telecommunication Union in the geostationary satellite. The Axial ratio is less than 1.0dB in Tx-band and 1.5dB in Rx-band that meet MIL-STD-188-164A.

Transmitter Design for Earth Station Terminal Operating with Military Geostationary Satellites on Ka-band (Ka 대역 군위성통신 지상단말 송신기 설계)

  • Kim, Chun-Won;Park, Byung-Jun;Yoon, Won-Sang;Lee, Seong-Jae
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.4
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    • pp.393-400
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    • 2014
  • In this paper, we have designed the transmitter for earth station terminal operating with military geostationary satellite on Ka-band that is complied with MIL-STD-188-164A. The designed antenna of this terminal is dual-offset gregorian reflector which is consist of corrugated horn and iris polarizer, othermode transducer. This antenna meets radiation pattern and transmit EIRP spectral density requirements in this standard. The designed RF systems of this terminal are consist of Block Up Converter(BUC) converting frequency band from IF to Ka band and SSPA having low-power consumption and compact light-weight using the pHEMT MMIC compound devices. This RF systems applied with VSWR, spurious/harmonic suppression, output flatness and phase noise requirement in this standard.