(JKONI 16(6): , Dec. 2012) 간결하고효과적인 X-band 위성통신용계단형셉텀편파기의설계방법 김지흥 *, 이재욱 *, 이택경 *, 조춘식 * Jee-Heung Kim *, Jae-Wook Lee *, Taek-Kyu

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1 (JKONI 16(6): , Dec. 2012) 간결하고효과적인 X-band 위성통신용계단형셉텀편파기의설계방법 김지흥 *, 이재욱 *, 이택경 *, 조춘식 * Jee-Heung Kim *, Jae-Wook Lee *, Taek-Kyung Lee * and Choon-Sik Cho * 요약 X-band.. EM (β).,. Abstract In this paper, a simple design method of stepped septum polarizer suitable for X-band satellite communication is proposed. This method is compared to two other conventional design methods in terms of time consumption and complexity of design procedure. In addition, an equivalent circuit modeling is used to analyze and design for the polarizer based on waveguide. For the validity of satisfying the satellite communication, electrical performances have been verified through the simulation and measurement results. Key words : Stepped Septum Polarizer, Design Method of Polarizer I. 서론 SAR(Synthetic Aperture Radar) / ISOFLUX [1]. ISOFLUX,,. ISOFLUX, (High Purity) (AR, Axial Ratio). * (School of Electronics, Telecommunications, and Computer Engineering, Korea Aerospace University) 1 (First Author) : (Tel : , heung2love@kau.ac.kr) (Corresponding Author) : (Jea-Wook Lee) : ( ) : ( : ) :

2 ,, /. (Slope) [2],., (Dielectric-Slab)[3] (Corrugation)[4].,.[5][6], f0.[3] (a) 정면도 (a) The Front View (Slab),., (Mode Matching Technique) [5].,., 1,, (Error Function). TE, TM,,..[7][8][9][10],.. (b) 측면도 (b) The Side View 그림 1. 4 단셉텀편파기의설계방법 Fig. 1. Design Method of the septum Polarizer with 4-stepped septum 1,. X-band, 1mm (0.014λ0),., Ⅱ. 셉텀편파기의설계방법 EM CST-MWS.[11] [5]

3 X-b ;,,, (a). 2(b) YX, Yin2 2. CST-MWS, (LL ) λ/4. 2(b) 3 λ/4 (YL) (Yin5), 2. β β, 3. La, Lb CST-MWS. (a) 셉텀편파기와내부의계단형격벽 (a) Inside Septum Polarizer 그림 3. 릿지높이에따른전파상수 (β) 및임피던스변화 Fig. 3. Variation of the Propagation Constant and Impedance according to the Height of the Ridge (b) 셉텀편파기의등가모델 (b) Equivalent Circuit of Septum Polarizer 그림 2. 셉텀편파기와등가모델 Fig. 2. Septum Polarizer and Equivalent Circuit, Yin2 Yin3. (LL ). λ/4 (La), (LL) 400Ω, 3 2(a) (LC) 574Ω 410Ω~500Ω. λ/4 Lb (LC) 620Ω (La) 10Ω. (LC) (La, Lb).,, 20dB, 3dB

4 dB. (La) 430Ω~450Ω, Lb La 30Ω (Lc) 620Ω. 3, 4 3 Excel. β β. Ⅲ. 시뮬레이션및측정 5, (Flange), 3 (Dip Brazing). [5]. λ π β β 는전파상수 3 La Lb, (β) Excel Za, Zb. 그림 5. 제작된셉텀편파기 Fig. 5. Manufactured Septum Polarizer 그림 4. 엑셀을이용한설계변수계산 Fig. 4. Design Parameter Calculation using Excel, 2(b) (Lc). 3,. Excel (β) 1 6, [5], 8.0~8.5GHz. 6(a),,. 5dB, 25dB. 6(b), 2-3dB

5 간결하고 효과적인 X-b 위성 통신용 계단형 셉텀 편파기의 설계방법 ; 김지흥, 이재욱, 이택경, 조춘식 897 값을 갖는 것을 확인할 수 있다. (a) 반사손실 특성 (a) Return Loss (c) 축비 특성 (c) Axial Ratio 그림 6. 측정 및 시뮬레이션 결과 비교 Fig. 6. Comparison of Measurement and Simulation Results 그림 6(c)의 축비특성의 경우, 두 모델의 시뮬레이 션과 측정결과 모두 전반적으로 유사한 경향을 가지 며, 측정결과는 대역 내에서 0.7dB이하의 낮은 축비 특성을 갖는 것을 확인할 수 있다. (시뮬레이션 환경 : Intel Core2 Quad Q GHz/2.83GHz CPU, 4G RAM, Windows 7 64bit) Ⅳ. 결 론 (b) 입력포트 사이의 격리도 특성 (b) Isolation between Two Input Ports 본 논문에서는 간결하고 효과적인 셉텀 편파기 설 계방법을 제안하였다. 기존의 방법과 비교하여 모드 정합 기술(Mode-Matching Technique)기반의 수식 계 산 및 시뮬레이션 조건 설정 과정을 생략하여 설계의 복잡성을 완화할 수 있었으며, 컴퓨터를 이용한 최적 화 과정 전에 요구규격에 근접한 성능을 만족시키는 초기설계를 진행함으로서 설계에 요구되는 시간소모 를 감소시킬 수 있었다. 제안된 방법으로 초기 설계 된 편파기는 시뮬레이션과 실제 제작품의 측정을 통 해, 기존방법으로 설계/제작된 편파기와 전기적 성능 을 비교하여 유사한 성능을 갖는 것을 확인하였다. 제안된 방법이 컴퓨터기반 최적화 과정 전의 초기설 계 단계임을 감안한다면, 추가적인 성능향상을 기대 할 수 있다.

6 감사의글 (NSL, National Space Lab) ( ). Reference [1] Kyung-Jin Jeon, Kyo-il Lee, Jae-gi Son, Taek-Kyung Lee, J.W. Lee and Woo-Kyung Lee, X-band isoflux pattern antenna for SAR data transmission, APSAR 2011, Seoul, South Korea, pp. 1-4, Sep, [2] D. Davis, O.J. Digiandomenico and J.A. Kempic, A New Type of Circularly Polarized Antenna Element, IEEE Antennas and Propagation Society International Symposium, vol. A247, pp , Oct [3] Ming Hui Chen and G.N. Tsandoulas, A Wide-band Square-Waveguide Array Polarizer, IEEE Trans. Antennas and Propagation, vol. AP-21, pp , May [4] R. Ihmels, U. Papziner, and F. Arndy, Field Theory Design of a corrugated septum OMT, IEEE MTT-S Digest, ISBN No: CH3277-1/93/ [5] J. Bornemann and V. A. Labay, Ridged waveguide polarizer with finite and stepped-thickness septum, IEEE Trans. Microwave Theory Tech., vol. 43, pp , Aug [6] Jeeheung Kim, Seongsik Yoon, Eunyoung Jung, J. W. Lee, T. K. Lee, and W. K. Lee, Triangular-shaped Stepped Septum Polarizer for Satellite Communication, IEEE International Symposium on Antennas and Propagation, Spokane, USA, pp , July, [7] Zhong, W., B. Li, Q. Fan, and Z. Shen, X-band Compact Septum Polarizer Design, ICMTCE, pp , May 22-25, [8] M. J. Franco, A High-Performance Dual-mode Feed Horn for Parabolic Reflectors with a Stepped-Septum Polarizer in a Circular Waveguide, IEEE Antennas and Propagation Magazine, vol. 53, no. 3, pp , [9] Hasan, S. A., Design & measurement techniques for innovative, high performance, circularly polarized, ultra wideband corrugated horn antenna with septum polarizer for space applications, ICMTCE, pp , May 22-25, [10] Diez, H., Compact Ka-band Telemetry Antenna for satellite applications, ANTEM, pp. 1-5, June 25-28, [11] CST MICROWAVE STUDIO 2010, Computer Simulation Technology. 김지흥 ( 金知興 ) : () : ( ) ~9 : ~ : :,, (EW) 이재욱 ( 李宰旭 ) : () : ( ) : ( ) ~ : ~ :, :,, EMI/EMC,,,

7 X-b ;,,, 899 이택경 ( 李澤璟 ) : () : ( ) : ( ) ~ : Univ. of Texas at Austin, Post-Doctoral Fellow ~ : ~ : Univ. of Illinois, Urbana Champaign, Associate Visiting Research Professor ~ : :,,, 조춘식 ( 曺春植 ) : () : South Carolina ( ) : Colorado ( ) ~ : : RFIC/MMIC,,,,,

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