• 전자공학회논문지
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• 제50권6호
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• pp.56-61
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• 2013

이 논문에서는 '0'에 가까운 굴절률을 갖는 단일층 메타물질 커버를 이용한 고 이득 패치 안테나를 제안하였다. 보통의 패치 안테나와 제안된 메타물질 패치 안테나를 전산모의를 통해 비교하였고, 제안된 메타물질 패치 안테나를 제작 및 측정하였다. 제안된 메타물질 패치 안테나는 보통의 패치 안테나에 비해 6.77dB 만큼 더 높은 이득을 가진다.

• Journal of electromagnetic engineering and science
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• 제17권4호
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• pp.233-237
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• 2017

In this paper, a dual-band high frequency (HF) and ultra-high frequency (UHF) radio-frequency identification (RFID) tag antenna is presented that operates in the 13.56 MHz band as well as in the 920 MHz band. A spiral coil along the edges of the antenna substrate is designed to handle the HF band, and a novel meander open complementary split ring resonator (MOCSRR) dipole antenna is utilized to generate the UHF band. The dual-band antenna is supported by a single-feeding port for mono-chip RFID applications. The antenna is fabricated using an FR4 substrate to verify theoretical and simulation designs, and it has compact dimensions of $80mm{\times}40mm{\times}0.8mm$. The proposed antenna also has an omnidirectional characteristic with a gain of approximately 1 dBi.

• 제어로봇시스템학회논문지
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• 제10권11호
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• pp.1037-1043
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• 2004

In this paper, a new fault detection and isolation algorithm fur inertial sensor system is proposed. To identify the inertial sensor fault, single antenna GPS receiver is used as an effective redundancy source. To use GPS receiver as redundancy for the inertial sensors, the algorithm to estimate the attitude and acceleration using single antenna GPS receiver is adopted. By using Doppler shift of carrier phase signal and kinetic characteristics of aircraft, attitude information of aircraft can be obtained at the coordinated flight condition. Based on this idea, fault diagnosis algorithm for inertial sensors using single antenna GPS based attitude is proposed. For more effective FDI, decision variables considering the aircraft maneuver are proposed. The effectiveness of the proposed algorithm is verified through the numerical simulations.

• 한국군사과학기술학회지
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• 제26권2호
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• pp.122-128
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• 2023

The target must be located within the main-lobe of the antenna in order to measure the direction of the target by using sum-delta monopulse technique. The most common way if the target is located within the main-lobe is to compare the amplitude of the sum channel received signal with the delta channel received signal. However, in the case of the single-ring circular array antenna, it is difficult to apply the conventional method due to its structural limitation where antenna elements do not exist in the center of the array. In this paper, we proposed a novel method to identify whether a target is located within the main-lobe by appropriately adjusting the feeding amplitude of each element constituting the single-ring circular array antenna through the particle swarm optimization method. Simulation results showed that the proposed method can determine whether the target is located within the main-lobe of the single-ring circular array antenna.

• 대한전자공학회논문지TC
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• 제47권1호
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• pp.43-52
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• 2010

본 논문에서는 스마트 안테나 기능을 지원하는 mobile-WiMAX 시스템을 구현하였고, 기존의 단일 안테나 m-WiMAX 시스템과 성능을 비교하는 실험을 하였다 스마트 안테나 기능을 지원하는 m-WiMAX 시스템을 구현하기 위해 여러 고려 사항이 있다. 그 중에 스마트 안테나 방식의 특성상 심볼 동기 획득, 빔형성, 캘리브래이션을 특히 잘 구현 해야만 원하는 성능의 스마트 안테나 기지국을 구현할 수 있다. 본 논문에서는 위의 3가지를 구현하였고 3가지가 제대로 구현되었을 때 스마트 안테나 시스템이 단일 안테나 시스템보다 성능이 우수하다는 것을 검증하였다. 4 배열 안테나의 환경에서 스마트 안테나 시스템은 데이터 산출량 관점에서 단일안테나 시스템보다 5.5dB의 성능향상을 실험을 통해 확인할 수 있었고 이는 이론적인 수치인 6dB와 거의 일치하는 결과 이다.

• ETRI Journal
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• 제41권4호
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• pp.536-548
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• 2019

In this study, an electronically steerable parasitic array radiator (ESPAR) antenna via analog radio frequency (RF) switches for a single RF chain MIMO system is presented. The proposed antenna elements are spaced at ${\lambda}/64$, and the antenna size is miniaturized via a dielectric radome. The optimum reactance load value is calculated via the beamforming load search algorithm. A switch simplifies the design and implementation of the reactance loads and does not require additional complex antenna matching circuits. The measured impedance bandwidth of the proposed ESPAR antenna is 1,500 MHz (1.75 GHz-3.25 GHz). The proposed antenna exhibits a beam pattern that is reconfigurable at 2.48 GHz due to changes in the reactance value, and the measured peak antenna gain is 4.8 dBi. The reception performance is measured by using a $4{\times}4$ BPSK signal. The measured average SNR is 17 dB when using the proposed ESPAR antenna as a transmitter, and the average SNR is 16.7 dB when using a four-conventional monopole antenna.

• 한국전자파학회논문지
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• 제13권3호
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• pp.243-250
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• 2002

무선 LA기 단말기 내부에 집적하기에 적합한 초소형 인쇄회고 형태의 안테나 개발을 위해 미앤더드 슬롯 안테나를 연구하였으며, 인쇄회로형 안테나의 협대역 특성을 개선하기 위하여 이중 미앤더드 슬롯 안테나론 제안하였다. FDTD 방법으로 수치 해석하였으며, 인계된 안테나의 측정치는 해석 결과와 잘 일치하였다. 측정결과, 단일 미앤더드 슬롯 안테나와 이중 미앤더드 슬롯 안테나의 대역폭(VSWR<2)은 각각 115MHz 와 164 MHz 이며, 단일 미앤더드 슬롯 안테나와 비교한 결과, 제안한 이중 미앤더드 슬롯 안테나의 대역폭이 43% 증가됨을 확인하였다.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2004년도 한국우주과학회보 제13권2호
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• pp.304-307
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• 2004

Satellite orbit determination using angles only data from single ground station is carried out. The KOMPSAT-1 satellite mono-pulse angle tracking data from 9-meter S-band antenna at KARI site in Daejeon are used for the orbit determination. Various angle tracking arcs from one-day to five-day are processed and the orbit determination results are analyzed. Antenna pointing data are predicted based on the orbit determination results to check the possibility of re-acquisition and tracking of the satellite signal. Normal satellite mission operations including orbit determination, antenna prediction, satellite re-acquisition and automatic tracking from predicted antenna angle pointing data are concluded to be possible when three-day angle tracking data from single tracking station are used for the orbit determination.

• ETRI Journal
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• 제37권4호
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• pp.647-656
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• 2015

This paper proposes a single-RF MIMO receiver that adopts a beam-switching antenna (BSA) instead of a conventional array antenna. The beauty of the proposed single-RF MIMO receiver with BSA is that it can be deployed in a very small physical space while achieving a full spatial multiplexing gain. Our analysis has revealed that the use of a BSA inevitably results in the spectrum spreading effect at the RF output, which in turn causes an SNR decrease and adjacent channel interference (ACI). Two novel receiver techniques are proposed to mitigate the issues of redundant sub-band suppression and ACI avoidance. Numerical analysis results verify the performance improvement from the proposed receiver techniques.

• 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.