• Title/Summary/Keyword: active antenna

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High-Performance Bidirectional Active Phased-Array Antenna Coupled by Transmission Line (선로결합에 의한 쌍방향 능동 위상차 배열 안테나의 동작특성 향상)

  • Choi, Young-Kyu;Kim, Ki-Rae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.3
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    • pp.427-437
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    • 2008
  • In order to increase the coupling efficiency of the power and phase of the active phase array antenna, we have fabricated the active phased-array antenna which is coupled by the transmission line, and investigated the relationship between the length of the coupling transmission line and coupling power and phase. The following three types of driving method - (1) giving the frequency difference between the two active antenna, (2) applying the input signal to the one side of the two antennas, and changing the eigen frequency of the other side antenna, (3) appling the different phase inputs to the active antennas was investigated. The experimental results showed that the interval of the antenna elements has not affected the power and the phase of the antenna.

Design and Experiment of Ku_band Linear Active Phased Array Antenna System (Ku 대역 선형 능동 위상 배열 안테나 시스템 설계 및 실험)

  • Ryu Sung-Wook;Eom Soon-Young;Yun Jae-Hoon;Jeon Soon-Ick;Kim Nam
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.7 s.110
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    • pp.694-705
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    • 2006
  • In this paper, the linear active phased array antenna system operated in Ku DBS band was designed and experimented. The antenna system was composed of sixteen radiating active channels and Wilkinson power combiners with 16-channel inputs, a stabilizing DC bias and phase control board. Electrical beams of the antenna system can be formed by controling the phase-states of 3-bit digital phase shifter inside each active channel by virtue of the phase control board. The amplitude and phase deviations measured between active channels were less than ${\pm}0.8dB$ and ${\pm}15^{\circ}$, respectively, and the noise figure of each active channel was measured less than 1.2 dB in the operating band. The measured performances of the overall antenna system showed the antenna gain of more than 23.07 dBi and the sidelobe level of less than -11.17 dBc, and the bore-sight cross-polarization level of less than -12.75 dBc in the operating band. Also, by phase-controlling active channels, the beam scan patterns at $10^{\circ},\;20^{\circ},\;30^{\circ}$ were measured, and the losses caused by the corresponding beam scanning were 1.1 dB, 2.5 dB and 3.6 dB from the measurements, respectively.

Active Antenna for T-DMB System Repeater (지상파 DMB 시스템 중계기용 능동형 안테나)

  • Kim, Nam-Hoon;Lee, Bom-Son
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2005.11a
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    • pp.313-316
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    • 2005
  • In this paper, an active antenna for terrestrial DMB(Digital Multimedia Broadcasting) repeater is designed. This active antenna is consist of receiving antenna and LNA(Low Noise Amplifier), A receiving antenna fed by using a microstrip line and radiation part is designed with rectangular spiral structure. An receiving antenna with frequency range of 162$\sim$212MHz, gain of -10dBi and LNA with gain of 20dBi, noise figure of 2.2 at frequency range for T-DMB are achieved.

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Manufacturing LNA Board for GPS Antenna and Proposal of Verification Method

  • Choi, Dong-Hun;Kim, Mi-Suk;Kim, Jong Seong;Son, Seok Bo
    • Journal of Positioning, Navigation, and Timing
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    • v.7 no.2
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    • pp.105-112
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    • 2018
  • This paper manufactured an active GPS antenna for ground vehicles and presented a method to verify the performances of the antenna and component technology of the low noise amplifier (LNA) board manufacturing. The manufactured GPS antenna is an active antenna where microstrip patch and LNA board were combined. The main performances were standing wave ratio, antenna gain, and axial ratio, and all satisfied the target specifications. The proposed component technology can be utilized as a basis data in which the performance of LNA board can be compensated in the mass production process inspection, and employed as a method to verify whether antennas are properly working in environmental tests.

A Study on the Measurement of the Beam Pattern of Array Antenna for VHF Radar using Active Beam Pattern Measuring Device and Drone (능동 빔패턴 측정장치 및 드론을 활용한 초단파레이다용 배열안테나의 빔패턴 측정에 대한 연구)

  • Kim, Ki-Jung;Lee, Sung-Je;Jang, Youn-Hui
    • The Journal of the Korea institute of electronic communication sciences
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    • v.14 no.6
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    • pp.1031-1036
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    • 2019
  • This study describes the technique of the beam pattern measurement of array antenna for VHF band radar using drone and active beam pattern measuring device. There is no anechoic chamber for measuring the beam pattern of a large size antenna in the country. In this study, to test the antenna beam pattern characteristics of the developed VHF band radar, the antenna beam pattern characteristics were tested by Drone mounting an Active Beam Pattern Measuring Device. By comparing the results of the pre-simulation analysis with the measured results for the antenna, we could confirm that the beamwidth and side-lobe characteristics are satisfactory. Through the antenna beam pattern measurement technology using Drone and Active Beam Pattern Measuring Device, the beam pattern measurement technology of array antenna of low frequency band and large antenna for low band radar will be used.

Design and Fabrication for T-DMB Active Type Antenna (지상파 DMB용 능동형 안테나의 설계 및 제작)

  • Park, Chang-Hyun;Shin, Dong-Ryul;Kim, Jeong-Pyo;Kim, Gi-Ho;Yang, Myo-Guen;Seong, Won-Mo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.1 s.116
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    • pp.44-52
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    • 2007
  • In this paper, An active antenna of T-DMB was developed to equip to handhold gadgets by using LNA and a parasitic element allowing to miniature. The size of the fabricated active antenna is $80{\times}6{\times}0.4\;mm$ and FR4 is used for the substrate. The size of the proposed antenna is reduced by 38.8% at the operating frequency compared to one without a parasitic element, and a short stub. The proposed antenna shows improved performance at the measurement especially in the ratio of S/N compared with conventional monopole of 300 mm. The proposed antenna is well able to adapt into handhold gadgets for receiving T-DMB.

Phased Array Antenna Using Active Device

  • Seo, Chul-Hun
    • KIEE International Transactions on Electrophysics and Applications
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    • v.4C no.6
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    • pp.306-309
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    • 2004
  • This paper presents a new active antenna consisting of a microstrip patch for the passive radiator, a mixer for frequency conversion, a voltage controlled oscillator (VCO) and a phase detector for phase control. The microwave signal frequency has been converted into intermediate frequency (IF) on the antenna elements by the mixer. The active antenna consists of two ports, the IF port has a transmitted IF signal via power combined to the baseband and the dc control port is under the control of the phase-detector. The input voltage of the VCO is controlled by the phase detector. The scan range of the array is determined by the phase detector and the VCO and is obtained between 30$^{\circ}$ and - 30$^{\circ}$

Calibration Method of Channels' Initial Phase Shift in Active Phased Array Antenna (능동 위상배열 안테나 채널의 초기위상 천이 보정 방법)

  • Mun, Yeong-Chan;Park, Chan-Gu;Pyo, Cheol-Sik;Jeon, Sun-Ik
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.37 no.7
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    • pp.18-23
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    • 2000
  • An active phased away antenna consists of many channels including radiator and active circuitary that contains low noise amplifiers and phase shifters. Each channel has different initial phase shift and gain because of inequality in active circuitary itself, interface between radiator and active circuitary, beam forming network and other antenna configurations. This is an inherent problem in active phased away antenna, therefore each channels' initial phase shifts and gains should be calibrated for obtaining the designed radiation pattern and antenna gain. In this paper, an efficient calibration method for the active phased array antenna is presented. By performing the above method, thhe antenna gain is increased more than 2.0 dB after calibrating considerably unequal 12 channels' initial phase shifts and gains.

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The Design of a Broadband E-plane H Sectoral Horn Phased Array Antenna Using Mutual Coupling (상호 결합을 이용한 광대역 E-면 H 섹터 혼 위상 배열 안테나 설계)

  • Lee, Cheol-Soo;Pack, Jeong-Ki
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.6 s.121
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    • pp.620-628
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    • 2007
  • An H-sector horn antenna has a constant beam coverage characteristic and it can be useful for application to a wide band phased array antenna system. In this paper, we designed a broadband E-plane H-sector horn phased-array antenna, which has a 3:1 bandwidth and ${\pm}60^{\circ}$ beam steering capability. An H-sector hem antenna was designed to have $30{\sim}50^{\circ}$ half-power beam width in the principal H-plane. The active reflection coefficient including mutual coupling was calculated using a waveguide simulator, and the active reflection characteristic was improved by mutual coupling over wide frequency range. Using these results, an $8{\times}1$ H-sector phased array antenna was fabricated. The measurement results for the half-power beam width in the principal H-plane and the active reflection coefficient showed a good agreement with the simulation results. The peak-value pattern in the steered radiation beams also agreed well with the active element pattern. The measured active reflection coefficients within the beam steering range are mostly less than 0.3 over the 3:1 frequency range.

A New Type of the Active Array Antenna for IMT-2000 Base Stations by Using Dual-Polarization Diversity (새로운 형태의 IMT-2000 기지국용 이중편파 다이버시티 능동형 배열안테나)

  • 이학용;강기조;이병제;이종철;김종헌;김남영
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.4
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    • pp.359-365
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    • 2002
  • In this work, a new type of the active array antenna for IMT-2000 base stations by using dual-polarization diversity is proposed and developed. As an element of array antenna, a single micorstrip patch antenna of ${\pm}$ 45$^{\circ}$slanted is designed by obtaining the bandwidth of 1,885 ㎒ to 22,000 ㎒. The polarization isolation between two linearly polarized waves is less than 16 ㏈. The gain of element antenna is more than 7 ㏈i. finally, 2${\times}$8 dual-polarization active array antenna is developed with ElRP of 1,200 W and polarization isolation of 20 ㏈ by placing a low power amplifier at each antenna element.