• Title/Summary/Keyword: phased array antennas

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Improved Genetic Algorithm for Pattern Synthesis of Phased Array Antenna (위상 배열 안테나의 패턴 합성을 위한 개선된 유전 알고리즘)

  • Jung, Jin-Woo
    • The Journal of the Korea institute of electronic communication sciences
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    • v.13 no.2
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    • pp.299-304
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    • 2018
  • An improved genetic algorithm was proposed for pattern synthesis of an adaptive beam forming system using phased array antennas. The proposed genetic algorithm is an algorithm that adds acquired characteristics procedure to solve local optimization using the diversity. The performance of the proposed genetic algorithm is verified through the problem of finding a suitable chromosome for a picture composed of binary. And it is confirmed that it is suitable for the adaptive beam forming system based on the performance problem of combining main beam and two pattern nulls.

CMOS true-time delay IC for wideband phased-array antenna

  • Kim, Jinhyun;Park, Jeongsoo;Kim, Jeong-Geun
    • ETRI Journal
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    • v.40 no.6
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    • pp.693-698
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    • 2018
  • This paper presents a true-time delay (TTD) using a commercial $0.13-{\mu}m$ CMOS process for wideband phased-array antennas without the beam squint. The proposed TTD consists of four wideband distributed gain amplifiers (WDGAs), a 7-bit TTD circuit, and a 6-bit digital step attenuator (DSA) circuit. The T-type attenuator with a low-pass filter and the WDGAs are implemented for a low insertion loss error between the reference and time-delay states, and has a flat gain performance. The overall gain and return losses are >7 dB and >10 dB, respectively, at 2 GHz-18 GHz. The maximum time delay of 198 ps with a 1.56-ps step and the maximum attenuation of 31.5 dB with a 0.5-dB step are achieved at 2 GHz-18 GHz. The RMS time-delay and amplitude errors are <3 ps and <1 dB, respectively, at 2 GHz-18 GHz. An output P1 dB of <-0.5 dBm is achieved at 2 GHz-18 GHz. The chip size is $3.3{\times}1.6mm^2$, including pads, and the DC power consumption is 370 mW for a 3.3-V supply voltage.

Four-channel GaAs multifunction chips with bottom RF interface for Ka-band SATCOM antennas

  • Jin-Cheol Jeong;Junhan Lim;Dong-Pil Chang
    • ETRI Journal
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    • v.46 no.2
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    • pp.323-332
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    • 2024
  • Receiver and transmitter monolithic microwave integrated circuit (MMIC) multifunction chips (MFCs) for active phased-array antennas for Ka-band satellite communication (SATCOM) terminals have been designed and fabricated using a 0.15-㎛ GaAs pseudomorphic high-electron mobility transistor (pHEMT) process. The MFCs consist of four-channel radio frequency (RF) paths and a 4:1 combiner. Each channel provides several functions such as signal amplification, 6-bit phase shifting, and 5-bit attenuation with a 44-bit serial-to-parallel converter (SPC). RF pads are implemented on the bottom side of the chip to remove the parasitic inductance induced by wire bonding. The area of the fabricated chips is 5.2 mm × 4.2 mm. The receiver chip exhibits a gain of 18 dB and a noise figure of 2.0 dB over a frequency range from 17 GHz to 21 GHz with a low direct current (DC) power of 0.36 W. The transmitter chip provides a gain of 20 dB and a 1-dB gain compression point (P1dB) of 18.4 dBm over a frequency range from 28 GHz to 31 GHz with a low DC power of 0.85 W. The P1dB can be increased to 20.6 dBm at a higher bias of +4.5 V.

Radiation Characteristics of an E-plane Linear Array Antenna Composed of Inductive Loaded Patch Antennas (Inductive loaded 마이크로스트립 패치 안테나를 이용한 E-평면 선형 배열 안테나의 방사 특성)

  • Yoon, Young-Min;Kwak, Eun-Hyuk;Kim, Jae-Hyun;Kim, Boo-Gyoun
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.7
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    • pp.59-67
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    • 2013
  • The radiation characteristics of an E-plane linear array antenna composed of inductive loaded patch antennas (ILPAs) are investigated. The radiation characteristics of an ILP array antenna are significantly improved compared to those of a conventional array antenna because the mutual coupling of an ILP array antenna is very small. The patch length of a $5{\times}2$ ILPA for the enhancement of the radiation characteristics of a 5-element E-plane linear array antenna composed of ILPAs is presented.

Satellite Communication Microstrip 8X2 Away Antenna for TX / RX Dual Operation at Ku-band (Ku 대역 위성통신 송수신 겸용 마이크로스트립 8X2 배열 안테나)

  • 윤재승;전순익;최재익;채종석
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.6
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    • pp.574-581
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    • 2002
  • Microstrip $8{ imes}2$ sub-array antennas for a extension to active phased array antennas are designed, fabricated and measured for TX/RX dual operation in satellite communication and a reception of satellite broadcasting. For the frequency range from 11.7 to 12.75 GHz for RX and from 14 to 14.5 GHz for TX, two orthogonal linear polarizations of ${pm}45^{\circ}$ are used to transmit and receive simultaneously with one radiator. They adopt dual resonance between two patches for wideband characteristics in RX band and show isolation characteristics over 20 dB. An electrical beam tilt of $30^{\circ}$ is achieved and a tapered power distribution, narrow element spacing are used for the purpose of low side-lobe characteristics.

A Study on the Design of Hybrid MIC Phase Shifter Using PIN Dioid (MIC화 PIN다이오드 하이브리드형 이상기의 설계에 관한 연구)

  • 김태회;박의준;박정기
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.12 no.4
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    • pp.325-334
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    • 1987
  • Microwave integrated circuit phase shifters have undergone remarkable development to satisfy the fast and precise phase control requirements for phased array antennas. It is shown how relection type phase shift circuits using PIN diode can be analyzed and implemented so as to derve design equations for any phase shift. The reflection properties are achieved by the use of an impedance transforming two-port network and the virtual matching impedance method. Experimental and theoretical performance of 2-bit hybrid phase shifter designed by this method are found to be in good agreement for each bit.

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3-bit Optical True Time Delay for 10 GHz Phased Array Antennas Composed of Optical 2$\times$2 MEMS Switches and Fiber Delay Lines (2$\times$2 MEMS 스위치와 광섬유지연선로를 이용한 10 GHz 위상배열 안테나용 3-bit 광학적 실시간 지연선로)

  • 이백송;신종덕;김부균
    • Proceedings of the Optical Society of Korea Conference
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    • 2003.02a
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    • pp.320-321
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    • 2003
  • 위성통신 및 무선통신에서 안테나의 수신 감도를 향상시키기 위한 노력은 계속되어 왔다. 안테나의 지향성을 높이기 위하여 다수의 동형 단위 안테나들을 일정 방향으로 배열하여 안테나를 기계적으로 회전시키지 않고, 고정된 다수의 동형 단위 안테나들에서 방사되는 전파의 위상을 전자적으로 변화시켜 방사 빔을 주사하는 방법, 즉 위상배열 안테나(Phased Array Antenna)를 널리 사용하고 있다. 위상배열 안테나의 단위 안테나에서 방사되는 전파의 위상을 변화시키기 위해선 실시간 시간지연 시스템이 필요하다. (중략)

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The Multi-Aperture Transmit Horn Antenna for Radar Space Feeder (레이다 공간급전용 다중-개구 송신 혼 안테나)

  • 조용문;박동철
    • Journal of the Korea Institute of Military Science and Technology
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    • v.6 no.3
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    • pp.113-121
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    • 2003
  • In this paper, the transmit antenna for the space feeder used for the phased array antennas is investigated. The multi-aperture horn antenna is proposed as the transmit antenna and the characteristics are verified with the Matlab coding, HFSS of Ansoft Corp., and MWS of CST Corp., The E-plane and H-plane beam patterns of the multi-aperture horn antenna are nearly symmetrical and the sidelobe level of the I-plane beam pattern is lower than that the of general pyramidal horn antenna. The fabricated multi-aperture horn antenna is measured using the near-field measurement system. The measured results show good agreement with the simulated ones.

Subarray Structure Optimization Algorithm for Active Phased Array Antenna Using Recursive Element Exchanging Method (재귀적 소자 교환 방식을 이용한 능동위상배열안테나 부배열 구조 최적화 알고리즘)

  • Chae, Heeduck;Joo, Joung Myoung;Yu, Je-Woo;Park, Jongkuk
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.8
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    • pp.665-675
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    • 2016
  • With the development of active phased array radar technology in recent years, active phased array antennas, which digitally combine signals received from subarray units using dozens of digital receiver, have been developed. The beam characteristics are greatly affected by the shape of the subarray structure as well as the weight of subarray in digital beamforming. So in this paper, the method to generate subarray structures by using recursive element exchanging method and the method to optimize subarray structures that can minimize sidelobes of operating beams are proposed. Additionally it presents the result to find the optimized subarray structure to minimize the maximum sidelobe of monopulse beam and pencil multi-beam respectively or simultaneously which are commonly used for digital beamforming by applying the algorithm propsed in this paper.

Effect of a Finite Substrate Size on the Radiation Characteristics of Two-Element Linear E-plane Array Antennas (유한한 기판 크기가 2소자 E-평면 선형 배열 안테나의 방사 특성에 미치는 영향)

  • Yoon, Young-Min;Kim, Boo-Gyoun
    • Journal of the Institute of Electronics and Information Engineers
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    • v.49 no.12
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    • pp.95-110
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    • 2012
  • The effect of a finite substrate size on the radiation characteristics of a two-element linear E-plane array antenna using microstrip patch antennas is investigated. The average active element pattern characteristics of two-element E-plane array antennas printed on different dielectric constant substrates with various substrate sizes and element spacings are analyzed. Using the average active element pattern, the radiation pattern characteristics of the array antenna versus scan angle is analyzed. The simulation results show that the diffracted fields of surface waves from substrate edges have a significant effect on the radiation characteristics of a 2-element E-plane array antenna. The distance between the center of patch antenna and the substrate edges on the E-plane for the enhancement of radiation characteristics of the array antenna is about $0.35{\lambda}_0$.