• International journal of advanced smart convergence
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• 제11권4호
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• pp.41-46
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• 2022

This study is a Ku-band array antenna for the manufacture of low-orbit satellite communication terminals, designed to have miniaturization, high gain, and wide beam width. The transmission of low-orbit satellite communication has a right-rotating circularly polarized wave, and the reception has a left-rotating circularly polarized wave. The 4×8 array antenna was separated for transmission and reception, and it was combined with the RF circuit part of the transmitter and receiver, and was terminated in the form of a waveguide for RF signal impedance matching in the form of a transition from the microstrip line to the waveguide. The 30° beam width of the receiver maximum gain of 19 dBi and the 29° beam width of the transmitter maximum gain of 18 dBi are shown. Through this antenna configuration, the system was configured to suit the low-orbit satellite transmission/reception characteristics.

• 한국전자파학회논문지
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• 제18권8호
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• pp.930-936
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• 2007

본 논문에서는 SDMB(Satellite Digital Multimedia Broadcasting) 시스템에서 동작하는 고 이득 광대역 안테나를 구현하였다. 제안된 안테나는 표면파를 억제하기 위한 SAP(Shorted Annular Patch) 구조와 이득, 대역폭 그리고 지향성을 개선시키기 위하여 $0.25 {\lambda}_0$ 간격을 갖는 3차원 배열의 기생 SAP로 구성되었다. 원형 패치상의 서로 반대 방향으로 농인 두 개의 슬릿을 이용하여 RHCP(Right Hand Circular Polarization)로 동작하도록 하였다. 모의 실험 결과, 제안된 안테나의 최대 방사 이득은 기존의 마이크로스트립 패치 안테나에 비해서 5.22 dBi 개선된 12.6 dBi로 나타났다. 제작된 안테나는 동작 주파수 2.63 GHz에서 최대 방사 이득이 10.5 dBi로 나타났다. 측정된 임피던스 대역폭$(VSWR{\leq}2)$은 기존의 마이크로스트림 패치 안테나에 비해서 300 MHZ 개선된 $360 MHz(2.488{\sim}2.848 GHz)$이며, HPBW(Half Power Beam Width)는 $45.8^{\circ}$, FBR(Front Back Ratio)은 15.49dBi로 나타났다. 3dB 축비 대역폭은 220 MHz$(2.54{\sim}2.76 GHz)$를 얻었다.

• Journal of electromagnetic engineering and science
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• 제13권1호
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• pp.28-33
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• 2013

This paper proposes a miniaturized high-isolation diversity antenna for wearable wireless body area network (WBAN) applications. An inverted-F type radiating element is used to reduce the overall dimension of the proposed antenna to $30mm{\times}30mm{\times}2.5mm$. The antenna performance on the human body phantom is analyzed through simulation and the performance of the fabricated antenna is verified by comparing the measured data with that of the simulation when the antenna is placed on a semi-solid flat phantom with equivalent electrical properties of a human body. The fabricated antenna has a 10 dB return loss bandwidth over the Industrial Scientific Medical (ISM) band from 2.35 GHz to 2.71 GHz and isolation is higher than 28 dB at 2.45 GHz. The measured peak gain of antenna elements # 1 and # 2 is -0.43 dBi and -0.54 dBi, respectively. Performance parameters are analyzed, including envelope correlation coefficient (ECC), mean effective gain (MEG), and the MEG ratio. In addition, the specific absorption ratio (SAR) distributions of the proposed antenna are measured for consideration in use.

• 한국군사과학기술학회지
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• 제20권1호
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• pp.90-97
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• 2017

In this paper, we propose a new array antenna scheme which has an improved side lobe level (SLL) as well as a simplified feeding network and a high gain. The proposed array scheme is based on a non-uniformly excited sub-array. For analysis, we use an array factor of sub-array antenna. In the simulation results, the simulated SLL and gain provide more than 18.43 dB and 26.63 dBi, respectively. For the verification of the proposed design scheme, the prototype antenna with $16{\times}8$ radiating elements was designed by the proposed array scheme. The measured SLL and gain are more than 19.85 dB and 25.53 dBi, respectively. This measurement result indicates that the proposed array scheme is reasonable.

• Journal of Electrical Engineering and Technology
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• 제10권4호
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• pp.1738-1745
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• 2015

Radiation characteristics of a probe-fed rectangular microstrip patch antenna printed on a finite grounded high permittivity substrate are investigated systematically for various square grounded dielectric substrate sizes with several thicknesses and dielectric constants by experiment and full wave simulation. The effect of the substrate size on the radiation characteristics of a rectangular patch antenna is mainly determined by the effective dielectric constant of surface waves on a grounded dielectric substrate. As the effective dielectric constant of surface waves increases, the substrate sizes for the maximum broadside gain and the required onset for a large magnitude of squint angle decrease, while the variations of the broadside gain, the front-to-back ratio, and the magnitude of squint angle versus the substrate size increase due to the increase of the power of the surface wave.

• 한국전자파학회논문지
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• 제27권8호
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• pp.766-773
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• 2016

본 논문에서는 항공기 탑재 회전 방향탐지용 소형 옵셋 파라볼릭 반사판 안테나를 제안한다. 반사판 안테나의 급전부로는 초광대역 특성을 보유하며, $45^{\circ}$ slant 선형 편파를 갖는 LPDA 안테나를 적용하였다. 반사판은 고이득과 항공기 동체 배면 탑재를 위해 파라볼릭 형상을 기준으로 크기를 소형화시켰으며, 고각 기준으로 $5^{\circ}$ 기울어지게 설계되었다. S 대역에서 Ka 대역까지 20:1의 초광대역 구간에서 제안된 안테나의 평균 이득은 27.97 dBi, 평균 반전력 빔폭은 방위각 $4.55^{\circ}$, 고각 $4.3^{\circ}$로 측정되어 펜슬 빔(pencil beam)의 방사패턴을 가지며 시뮬레이션 결과와 유사함을 확인하였다. 설계된 안테나는 제한된 영역 내에 장착되는 소형의 옵셋 파라볼릭 반사판 안테나로서 원하는 초광대역과 고이득 특성을 확보하여 항공기에 탑재되는 회전 방향탐지 안테나 시스템에 적용 가능할 것으로 판단된다.

• Journal of electromagnetic engineering and science
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• 제12권2호
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• pp.155-160
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• 2012

A wideband circularly polarized pinwheel-shaped planar monopole antenna fed by a wideband feeding network is presented in this paper. The proposed antenna is formed by four wideband planar monopole antenna elements with aquadruple feeding network in order to improve the performance of circular polarization. Additionally, the antenna, which is introduced here, has a high gain in the z axis direction because of its folded antenna structure. The attractive characteristics of the proposed antenna are the wide impedance bandwidth of 87.3 % (1 GHz to 2.55 GHz), the 3 dB axial ratio (AR) bandwidth of 92.3 % (1.05 GHz to 2.85 GHz), and the maximum gain within the 3 dB AR bandwidth is about 8.24 dBic.

• 반도체디스플레이기술학회지
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• 제17권2호
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• pp.20-25
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• 2018

In this paper, we have designed circularly polarized array antenna for 5.8GHz microwave wireless power transmission. To obtain high antenna gain, we studied a single patch antenna, a $2{\times}1$ array antenna, a $2{\times}2$ array antenna, a $2{\times}4$ array antenna, and a $4{\times}4$ array antenna. Commonly, characteristics of each antenna have a frequency of 5.8 GHz and Right Hand Circular Polarization(RHCP) of circular polarization. Also, the results were obtained with the design to each antenna that the return loss was less than -10dB and the axial ratio was less than 3dB. The gain of the antennas was 6.08dBi for a single patch antenna, 9.69dBi for a $2{\times}1$ array antenna, 12.99dBi for a $2{\times}2$ array antenna, 15.72dBi for a $2{\times}4$ array antenna and 18.39dBi for a $4{\times}4$ array antenna. When the elements of the array antenna were increased, it was confirmed that it increased by about 3dBi.

• 방송공학회논문지
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• 제16권3호
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• pp.483-489
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• 2011

본 논문에서는 광대역, 양호한 복사패턴, 그리고 고이득 특성을 갖는 새로운 안테나를 제안하였다. FDTD(Finite Difference Time Domain) 법을 이용하여 본 안테나를 해석하였으며, 안테나의 파라메타는 최대대역폭을 갖도록 최적화 설계하였다. 측정한 결과, 안테나의 대역폭은 0.839 옥타브(S11${\leq}$-10 dB). 그리고 제안된 안테나의 측정된 교차편파 복사패턴은 -25dB이하의 우수한 특성을 보였다. 안테나의 측정된 반사손실과 복사패턴 특성도 나타내었으며, 측정된 대역폭 특성은 FDTD 결과와 비교적 잘 일치하였다. 제안된 안테나는 MIMO, LAN, 의료기기, 그리고 방송용 시스템에 적용할 수 있다.

• 전기학회논문지
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• 제61권11호
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• pp.1668-1670
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• 2012

In this paper, a satellite array antenna operates at 12.2GHz~12.75GHz was designed and fabricated. The lowest height and high gain electrical beam tilt was obtained by applying backed slot and sub-reflector widening the distance between the patch and the GND. The simulation and measurement showed good agreements, the electrical beam tilt was $10^{\circ}$, the gain was 26.5dBi, the VSWR was less than 3:1 and the return loss was less than -15dB.