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5G 단말기용 이중대역 평면 다이폴-스트립 배열 안테나 설계
정봉식(Bongsik Jeong) 한국정보기술학회 2022 한국정보기술학회논문지 Vol.20 No.2
In this paper, a dual-band 4x1 dipole-strip array antenna operated at 28㎓ and 39㎓ is designed to be applied to antenna-in-package(AiP). The dipole antenna is fed by a microstrip line and the strip is fed by a coupling with the dipole. Two poles of the dipole antenna are arranged separately on both sides of the substrate to utilize the line feed; one pole is on the ground plane, and the other pole is located on the other side of the substrate. As the phase difference between the neighboring ports of the array antenna changes, the gain and beam steering angle of the array antenna change. When the phase difference is changed to 0~135˚, the gain at 28㎓ and 39㎓ changes to 8.9~8.2㏈ and 10.2~9.4㏈, respectively, and the beam steering angle changes to 0~39˚ and 0~30˚, respectively. The designed array antenna has a thin thickness of 24.5㎜×3.34㎜×0.324㎜ in size and –10㏈ bandwidth of 26.6~29.7㎓ and 37.6~40.3㎓ in both bands, which has a bandwidth of about 3㎓.
CPW 급전 이중대역 원형편파 이중 V구조 안테나 설계
최종호(Jongho Choi),정봉식(Bongsik Jeong) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.2
Recently, CPW(Co-Planar Waveguide)-fed multi-band circularly polarized antennas have been studied greatly. In this paper, we design double V-shaped antenna fed by CPW with dual-band(GPS and DSRC bands) CP(Circular Polarization) characteristics. CPW feeding has a characteristic that it is easy to manufacture because the feed line and the radiation plane is on the same plane. The CP characteristic is obtained by double V-shaped structures in which two rectangular lines of different lengths are arranged in V-shape and connected to the feeding line. The dielectric substrate is FR4-epoxy with a dielectric constant of 4.4 and a thickness of 1.6mm. Simulation results of designed antenna show that the -10dB return loss bandwidth is 1.2GHz in the GPS band and above 3.34GHz in the DSRC band, and the 3dB axial bandwidth is 120MHz in both bands. The peak gain of the antenna in both bands is 4.5dB and 5dB, respectively. And simulated and measured return losses are compared.
최종호(Jongho Choi),정봉식(Bongsik Jeong) 한국정보기술학회 2024 한국정보기술학회논문지 Vol.22 No.2
In this paper, we designed a dual-band dual-polarized 4x1 array antenna operating at 28GHz and 39GHz bands. The dual band was implemented with a dipole and a parasitic strip, and the dual polarization was implemented by crossing two dipole-strip antennas and applying a phase difference to the two ports. Here, the parasitic strip acts as a director and the flat conductor acts as a reflector, which increases the gain of the antenna. The feed line used a U-shaped microstrip line with a dipole vertical conductor as a ground surface. The dual-band dual-polarized cross antenna was designed as a 4x1 array antenna in a linear array. At this time, when the phase difference between two ports of the cross antenna is –90°, the level difference with the cross-polarization became 15dB. When the phase difference between the array elements is changed from 0° to 135°, the maximum beam steering angles of 30° and 22.5° and the maximum gains of 13.6dB and 13.1dB in both bands was obtained. And the frequency bandwidth in the two bands was 5GHz and 3.5GHz, satisfying the bandwidth required for 5G service.
서상규(Sang-gyu Seo),정봉식(Bongsik Jeong) 한국정보기술학회 2012 Proceedings of KIIT Conference Vol.2012 No.5
본 논문에서는 멀티암 스파이럴 안테나를 위한 디지털 모드형성기를 설계하였다. 입력신호는 고속 ADC로 샘플링 되고 샘플링 신호는 힐버트 변환 알고리즘을 이용하여 위상차가 90˚인 2개의 신호를 생성하고 이를 이용하여 주어진 천이위상 만큼 입력신호의 위상을 천이시키게 된다. 천이위상은 암의 수 혹은 모드 수에 따라 결정된다. 여기서는 입력신호에 포함된 잡음의 크기에 따라 위상천이 결과를 비교하여 디지털 위상천이기의 성능을 살펴보고자 한다. In this paper, we designed digital mode-forming network for multi-arm spiral antenna. Input signal is sampled by high speed ADC(Analog-Digital Converter), and two digital signals with the phase difference of 90˚ are generated by digital Hilbert transform, and finally two digital signals are phase-shifted digitally with a given shifting phase. Shifted phases are determined by the number of arm. Here the performance of digital mode-forming network as the magnitude of noise is considered.