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1 김영민 *, 정용선 *, 노재우 *, 장리검 *, 안병철 ** 요약 Abstract This paper presents a broadband orthomode transducer (OMT) operating at 7-87GHz. The proposed OMT consists of a T-shaped bifurcation structure, a polarization divider section and three input/output ports. In the initial design step, the dimensions for the T-shaped bifurcation and the polarization divider section are derived from the theoretical approach method. Next, the optimized dimensions of the OMT are acquired by using the parametric-sweep methods. The final model of the OMT is finally designed by adapting low-loss waveguide transitions at each input/output port. The optimally designed OMT is fabricated by three split blocks and measured by using the WR-12 waveguide calibration kits. The fabricated OMT shows that it has a reflection coefficient of less than -17dB, a transmission coefficient of larger than -.5dB and an isolation of less than -33dB over 7-87GHz. Keywords wideband OMT, T-shaped bifurcation junction, polarization divider section, split blocks for fabrication ž Received: Apr. 28, 215, Revised: July 16, 215, Accepted: July 19, 215 ž Corresponding Author: Bierng-Chearl Ahn Director of Applied EM Lab, Chungbuk National University, 52 Chungdae-ro 1, Seowon-gu, Cheongju City, Chungbuk Province, , Korea Tel.: , bician@cbu.ac.kr

2 44 7/8GHz.,,, [1].... (Orthomode Transducer; OMT),,... T- - [2], [3], folded tumstile [4]-[6], [7]-[9]. T- 7-8GHz.. 1 (OMT).,,. T-. WR GHz -15dB.5dB. 3dB. Circular to rectangular waveguide transition Side port (vertical polarization) T-shaped cross section Mitered bend Straight port (horizontal polarization) Common port Vertical polarization Horizontal polarization 2-step transition Polarization separating junction

3 2. CST Microwave Studio TM v WR-12 a = a 1=3.1mm, b = b 1=1.55mm. (d) (a 6 b 6). (d) (7-87 GHz) TE11 3.1mm. TE GHz. (a 6 b 6 ) TE 1 (7GHz).9. spike. spike. (a 6 b 6) mm. T- (a 16) (b 16). (a 16) spike a mm (b 16 ) 1/5. T- (a 13, a 14, a 15) a 16. (b 14 ) -. (α) 45 (b 13) λ g/5 1.3mm.. (b 2 - b 6). (b 2) b 6 1/2. (l 2. - l 6) λ g/4 3. (a) 45 (b 13, b 14 ) h c [1]. hc 1.7mm.. parametric-sweep.

4 46 7/8GHz T-,,. (l 3 ). l 3 (b 2 ). l 3 =.9mm, b 2 =1.6mm. (l 9 ).29mm. T-... T- (l 5 ). (b 4 ). T-. T- (b 5 ) (a 6 ).. 4. T- WR dB, -3dB, - -35dB. 2. α

5 Journal of KIIT. Vol. 13, No. 7, pp. 43-5, July 31, 215. pissn , eissn 표 2와 같이 최적 설계된 직교모드 변환기는 성 능 확인을 위해 제작 측정하였다. 7-8 GHz 대역 직교모드 변환기는 표 2에 제시된 것과 같이 모든 치수가 매우 작다. 직교모드 변환기는 정밀한 가공 을 위해 그림 5와 같이 3개의 split 블록으로 나누어 제작하였다. 각 split 블록은 가이드 핀과 볼트로 결 합된다. 그림5에서 OMT part I/II는 서로 대칭적으 로 설계되었고 다른 블록은 원형-정사각 도파관 변 환부이다. 그림 6은 개별적으로 제작된 3개의 split 블록을 조립한 상태와 공용 포트용 정합 부하이다. 제작된 직교모드 변환기의 성능은 회로망 분석기 를 이용하여 측정하였다. 그림 7의 WR-12 도파관 보정세트(Short, Offset Short, 정합 부하)를 이용하여 회로망 분석기를 보정하였다. -5 Reflection coefficient (db) Ⅲ 직교모드변환기 제작 및 실험 (a) 공용포트-수직편파 (Common port-vertical pol.) Reflection coefficient (db) (b) 공용포트-수평편파 (Common port-horizontal pol.) -5 Reflection coefficient (db) 그림 5. 직교 모드 변환기의 제작 모델 Fig. 5. Fabrication models of the OMT (c) 측면포트 (Side port) Reflection coefficient (db) 그림 6. 조립된 OMT와 공용 포트용 정합부하 Fig. 6. Assembled OMT and a load (d) 직선포트 (Straight port) 그림 8. 제작된 교차모드변환기의 반사계수 Fig. 8. Reflection coefficient of the fabricated orthomode transducer 그림 7. WR-12 도파관 보정 세트 Fig. 7. WR-12 waveguide calibration kit

6 48 7/8GHz GHz -17dB. Insertion loss (db) Insertion loss (db) Isolation loss (db) dB. 1-33dB. 7/8-GHz,. T-. T-,..,,. 3 split. OMT WR-12.., -.5dB -33dB.,. [1] M. A. Meyer and H. B. Goldberg, "Applications of the turnstile junction", IEEE Trans. Microwave Theory Tech., Vol. 3, No. 6, pp. 4-45, Dec [2] A. Dunning, S. Srikanth, and A. R. Kerr, "A simple orthomode transducer for centimeter to submillimeter wavelenghts", Proc. Int. Symp. Space Terahertz Tech., 2-22 Apr. 29. [3] L. Salghetti, R. Vallauri, P. Besso, and M.

7 Mongiardo, "A manufacturing-oriented 9GHz ortho-mode transducer for a polarimetric experiment", Proc. 32nd European Microwave Conf., pp. 1-4, Sept. 22. [4] J. A, Ruiz-Cruz, J. R. Montejo-Garai, and J. M. Rebollar, "Full-wave modeling and optimization of Bøifot ortho-mode transducers", Int. J. RF Microw. Comp.-Aided Eng., Vol. 18, Issue 4, pp , July 28. [5] Bøifot. A. M., E. Lier, and T. Schaug-Pettersen, "Simple and broadband orthomode transducer", IEE Proc. H, Microw. Antennas Propagat., Vol. 137, No. 6, pp , Dec [6] Moorey. G., R. Bolton, A. Dunning, R. Gough, H. Kanoniuk, and L. Reilly, "A GHz cryogenically cooled receiver for radioastronomy", Proc. Workshop on the Applications of Radio Science, Feb. 26. [7] A. Dunning, "Double ridged orthomode mode transducer for the 16-26GHz microwave band", Proc. Workshop on the Applications of Radio Science (WARS 22), 2-22 Feb. 22. [8] D. I. L. Villiers, P. Meyer, and K. D. Palmer, "Design of a wideband orthomode transducer", Proc. IEEE ARFRICON, pp. 1-6, Sep. 29. [9] G. M. Coutts, H. Dinwiddle, and P. Lilie, "S-band octave-bandwidth orthomode transducer for the extended very large array", Dig. IEEE 29 Antennas Progat. Soc. Int. Symp. (APSURSI '9), pp. 1-4, June 29. [1] Ki-Rock Kim, Byung-kook Joo, Jae-Hoon Bang, Bierng-Chearl Ahn, and Jong-Hun Chun, "Optimal Design and Fabrication of a Stepped Waveguide Bend at Ka-Band", JKIIT, Vol. 7, No. 6, pp , Dec. 29. 김영민 (Young-Min Kim) 정용선 (Yong-Sun Jung) 노재우 (Jae-Woo Noh) 장리검 (Li-Jian Zhang)

8 5 7/8GHz 안병철 (Bierng-Chearl Ahn)

DBPIA-NURIMEDIA

DBPIA-NURIMEDIA 초고주파대역도파관부품측정기술 Measurement Techniques for Microwave Waveguide Components 저자 (Authors) 유상길, 최순우, 김동현, 김대오, 안병철 Sang-Gil Yu, Swoon-Woo Choi, Dong-Hyun Kim, Dae-Oh, Kim, Bierng-Chearl Ahn 출처 (Source) 한국정보기술학회논문지

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