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RISS 인기검색어
- 검색키워드
- 저자 : 안병철(Bieng-Chearl, Ahn) (검색결과 2 건)
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박영규(Young-Kyu Park),노준우(Joon-Woo Noh),안병철(Bieng-Chearl, Ahn) 한국정보기술학회 2018 한국정보기술학회논문지 Vol.16 No.3
This paper presents a circularly-polarized crossed dipole for use in the feed of a C-band telemetry tracking reflector antenna. The proposed dipole is of printed type and fed by a microstrip line with an integrated balun. The crossed dipole is optimally designed by iterative adjustments of design parameters. The designed crossed dipole has reflection coefficient of less than -15dB at 4.8-5.6GHz, and at 5.12GHz, gain of 10dBic, axial ratio of 1.0-3.9dB and gain taper of 9.7dB within 64° from the beam axis. Five units of the designed crossed dipole are placed on a 136-mm diameter ground plane to design a monopulse feed for a prime-focus monopulse reflector antenna with F/D of 0.4. The sum pattern of the designed feed is nearly same as that of a single crossed dipole, and azimuth and elevation difference patterns have gain of 10.6dBic, axial ratio of 1.7-6.9dB, gain taper of 8dB, and null gain of -30dBic. The performance of the designed feed has been verified by applying it to a 1300-mm diameter reflector antenna with a focal length of 520mm.
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인쇄형 다이폴을 이용한 Ku-대역 원형도파관-동축선 변환부 설계
윤제영(Je-Young Yun),노준우(Joon-Woo Nho),이찬호(Chan-Ho Lee),박영규(Young-Gyu Park),안병철(Bieng-Chearl Ahn) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.7
Circular waveguides are widely used in the realization of reflector-antenna feeds, orthomode transducers, polarizers, filters/multiplexers, and rotary joints. A circular waveguide to coaxial cable transition is often employed to connect a circular waveguide to a transmitter/receiver. This paper presents an in-line circular waveguide to coaxial cable transition employing a printed dipole. The proposed transition consists of a shorted circular waveguide, a microstrip feed line, a microstrip balun, a printed dipole, a parasitic element for wideband operation, and a coaxial probe. Change in the reflection coefficient of the transition versus design parameters is analyzed, from which an optimum design is obtained. Designed transition is fabricated and it reflection coefficient is measured and compared with the simulation. The proposed transition shows reflection coefficient of less than -15dB and higher-order mode levels of less than -20dB at 13.4~17.2GHz.
ScienceON
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