RF S-. (sacecraft) [3],[5] [7]. 그림 1. RF Fig. 1. Configuration for RF comatibility testing between launcher and ground station in assembly building..,

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THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Feb.; 26(2), 148 157. htt://dx.doi.org/10.5515/kjkiees.2015.26.2.148 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) RF S- Comact S-Band Antenna Hat for RF Comatibility Testing of Launch Vehicle 김성완 박동철 Sung-Wan Kim Dong-Chul Park* 요약 RF.. S- 88 mm 35 mm 44 mm -F (74 mm 13 mm 16 mm) 2.25 GHz 25.6 db, 0.26 db, 49.4 db.. Abstract In this aer, we roose a comact antenna hat to erform RF comatibility testing efficiently between the launch vehicle and ground stations. The roosed structure imlements a small size and low loss using the conductive shield instead of the conventional RF absorber. The S-band antenna hat, which is fabricated for an inverted-f onboard antenna with the size of 74 mm 13 mm 16 mm, has the small enclosure of 88 mm 35 mm 44 mm, the return loss of 25.6 db, the insertion loss of 0.26 db, and the leakage loss of 49.4 db at the center frequency of 2.25 GHz. The simulated and measured results show a good agreement. Key words: Antenna Hat, Antenna Test Couler, Launch Vehicle, RF Comatibility Testing, Telemetry. 서론,, (skin) RF /.,, /. 1 RF (comatibility). (line-of-sight) RF. RF 1 Method (a). (reeat ant), (direct signal) (reflected signal) (Korea Aerosace Research Institute) * (Deartment of Radio Science & Engineering, Chungnam National University) Manuscrit received October 20, 2014 ; Revised December 12, 2014 ; Acceted December 23, 2014. (ID No. 20141020-085) Corresonding Author: Dong-Chul Park (e-mail: dcark@cnu.ac.kr) 148 c Coyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved.

RF S-. (sacecraft) [3],[5] [7]. 그림 1. RF Fig. 1. Configuration for RF comatibility testing between launcher and ground station in assembly building..,,.,. 1 Method (b), RF. ( ) (antenna hat) [1]. (antenna test couler), RF RF [2],[3]..,, [4],,.. (rubber sheet),. / ( ),. (, KSLV-I) S- -F..,. RF.. 설계및시뮬레이션 2-1 규격설정및요구조건 RF,.,. /,. [4] 1. (leakage loss), 1, 2 S 21. 149

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 2, Feb. 2015. 표 1. S- Table 1. Secification of S-band antenna hat for launch vehicle. VSWR / / 2.2 2.3 GHz 2:1 50 Ω 10 db ±1 db 40 db 20 watt SMA female Comatible to onboard antenna and vehicle skin 그림 2. Fig. 2. Onboard antenna and eriheral equiments of launch vehicle..,,.,.,.. S- 3. (telemetry) -F (blade) [8]. S- 74 mm, 13 mm, 16 mm, 2.2 2.3 GHz. (oen) (antenna hat body), (couling robe), (couling block), (guide block)., 2,., / (cowl).. 2-2 구조제안및설계 그림 3. Fig. 3. Sectional view of the roosed antenna hat with onboard antenna. 150

RF S- (a) (L b ) (a) Length(L b ) variation 그림 4. Fig. 4. Flow diagram for decision of all design arameters.. (L b ), (W b ), (H b ) (H ), (D ), (L ), (W ) 7. HFSS(High Frequency Structure Simulator). 4. (L b W b ). (H b ), (H ) λ/4. (D ),. (L ), (W ).,. (b) (W b ) (b) Width(W b ) variation (c) (H b ) (c) Height(H b ) variation 그림 5. S- ( : L b =88, W b =35, H b =44, D = 48.5, H =25 mm) Fig. 5. S-arameters according to the body size of the antenna hat(fixed values excet variable: L b =88, W b = 35, H b =44, D =48.5, H =25 mm). 151

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 2, Feb. 2015.,. 5 (L b ), (W b ), (H b ) S-. (L b ), (W b ), (H b ). (W b ), (H b ) 44 mm 46 mm 100 MHz, 44 mm 46 mm (a) L =11 mm (W ) (a) Width(W ) variation at L =11 mm (a) (H ) (a) Height(H ) variation (b) W =8 mm (L ) (b) Length(L ) variation at W =8 mm 그림 7. S- ( 5 ) Fig. 7. S-arameters according to the size of the couling block(other arameters are the same in Fig. 5). (b) (D ) (b) Position(D ) variation 그림 6. S- ( 5 ) Fig. 6. S-arameters according to the osition and height of the robe(other arameters are the same in Fig. 5).. 6 (D ), (H ) S-. (H ). (H =27 mm) 1 mm (H =26 mm H =27 mm) 150 MHz., (D 152

발사체의 RF 호환성 시험을 위한 소형 S-밴드 안테나 햇 외부 (a) (a) Outside view 안테나 햇의 유 무에 따른 파라미터 시뮬레이션 그림 8. / SFig. 8. Simulated S-arameters with and without antenna hat. 증가할수록) 공진주파수의 변화와 함께 반사손실이 감소 하며, 이에 따른 커플링량이 감소함을 알 수 있다. 그림 7은 커플링 블록을 추가할 때 커플링 블록의 폭 (W )과 길이(L )의 변화에 따른 S-파라미터 변화를 보여준 다. 폭(W )과 길이(L )를 변화시켜 대역폭의 조정과 공진 주파수의 미세 튜닝이 가능함을 알 수 있다. 상기와 같은 파라미터 분석을 통해서 얻게 된 최적화 된 안테나 햇의 치수는 L =88 mm, W =35 mm, H =44 mm, D =48.5 mm, H =25 mm, W =8 mm, L =11 mm이다. 이 크 기는 탑재안테나의 치수를 감안할 때 부피가 크게 증가 하지 않으며, 안테나 햇을 설치하기 위한 필요 면적도 충 분히 작음을 알 수 있다. 그림 8은 최적 설계값을 사용하여 안테나 햇이 있을 때 와 없을 때(자유공간 방사 조건)의 S-파라미터 시뮬레이 션 결과이다. 햇 유/무에 상관없이 공진주파수의 큰 변화 가 없으며, 반사손실 특성도 전반적으로 유사하다. 특히, 햇이 있는 경우, 없는 경우보다 향상된 반사손실을 얻는 이유는 안테나 햇에서 정합도를 더 높인 결과로 예상된 다. 또한, 사용 대역 내 삽입 손실도 표 1의 설정된 규격 보다 훨씬 향상된 0.5 db 정도로 우수한 특성을 보여준다. b 내부 (b) (b) Inside view b b Ⅲ. 제작 및 측정 제안된 소형 S-밴드 안테나 햇의 제작된 형상을 그림 9에 나타내었다. 햇 내벽은 그림 9(b)와 같이 흡수체를 사 제작된 안테나 햇 사진 그림 9. Fig. 9. Photograh of the fabricated antenna hat. 용하지 않는 구조로 도체 알루미늄 재질을 사용하였다. 발사체 외부 스킨과의 접촉면은 발사체의 직경 2 m 원형 동체를 고려하여 곡률 처리하였으며, 전파누설량을 감소 시키기 위해서 EMI 가스켓을 적용하였다. 그림 10은 안테나 햇 설치 전과 후의 발사체 외피 사진 으로 위성을 보호하기 위한 페어링(fairing)이 덮여지지 설치 전 (a) (a) Before installation 설치 후 (b) (b) After installation 발사체 외피에 안테나 햇 설치 전 후 사진 그림 10. / Fig. 10. Photograh of the installation of antenna hat on launch vehicle. 153

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 2, Feb. 2015. 표 2. Table 2. Measured results of onboard antenna and fabricated antenna hat in oerating band. (GHz) (db) (db) + (db) (db) 2.20 16.6 18.7 0.26 48.2 2.25 22.0 25.6 0.26 49.4 2.30 13.9 14.3 0.57 51.0 그림 11. / S- Fig. 11. Measured S-arameters with and without antenna hat.. 10(b). ( ). 10(b) Agilent E8362B 1, 2 S-. 50 Ω, S 21. 15 db 1,990 2,330 MHz, 2.2 dbi. S- 11, 8. 2,,. 2.2 dbi. 1.. 10 20 db. 1 RF RF... 시스템시험 S- S-. 12,. S- 2,. (telemetry data encoder). (video comression unit),,. RF (transmitter #1) (transmitter #2). 2, 2 S-. 154

RF S- 그림 12. Fig. 12. Configuration of onboard system testing using antenna hat. (I/F). Insnec 2 RTR(Radio Telemetry Receiver),, RF. (TLM GSE: Telemetry Ground Suort Equiment) (VCS GSE: Video Comression System Ground Suort Equiment). 3 12 RF., RTR (f1) (f2) 38.5 dbm, 39 dbm. 1.08 db, 0.58 db.,,., 13 PCM/FM. 2 Mbs NRZ, FM 0.35, (remodu- 표 3. RF Table 3. RF budget of onboard system testing using antenna hat. TX RX / Transmitter #1 TLM-TX 43 dbm(20 W) Transmitter #2 Video-TX 43 dbm(20 W) Dilexer DIP 0.9 db Power divider PD 3.3 db Coaxial Cable T1 Micro-coax UFB197C 0.3 db(65 cm) Coaxial Cable T2 Micro-coax UFB197C 0.6 db(1.65 m) Attenuator 1 (100W) Attenuator 2 Power slitter (resistive tye) EIRP 37.9 dbm Weinschel 48-30-34 30 db 30 db Weinschel 1515-1 5.8 db Coaxial Cable R1 Telcon SS402 8.6 db(10 m) Coaxial Cable R2 Telcon SS402 2.58 db(3 m) RX loss 76.98 db I/F Antenna hat 0.5 db@f1, f2 RX level 39.58 dbm lation) 6..,. 155

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 2, Feb. 2015. 그림 13. Fig. 13. Sectrum of video transmitting outut in system test using antenna hat.,..,. 74 mm 13 mm 16 mm -F S- 88 mm 35 mm 44 mm, 2.25 GHz 25.6 db, 0.26 db, 49.4 db. RF,. References 그림 14. RF Fig. 14. Antenna hat installation for RF comatibility testing in assembly building before launch oeration., /. 14, 1 Method(b) (end-to- end) RF.. 결론. [1] Radar Transonder Antenna Systems Evaluation Handbook(RCC Doc. 265-06), ETMG-RCC, New Mexico, chater 6.6, Jul. 2006. [2] J. F. Michaels, "Non-intrusive testing of an aircraft installed instrument landing system based on DGNSS", IEEE Position Location and Navigation Symosium,. 495-500, 1998. [3] J. Baros Jr., R. R. Manley, "Transitioning sacecraft radio frequency comatibility testing for future alications", AIAA SaceOs Conference, AIAA 2008-3402, 2008. [4] Sacecraft Antennas and Antenna Hats, Antenna Develoment Cororation, htt://www.antdevco.com [5],,,, " 2 ",,. 980-983, 2006 4. [6],,,,,, "Sband RF Comatibility ",,. 999-1002, 2009 11. 156

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