• Title/Summary/Keyword: Antenna

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The development of a Hipass antenna with the beam-tilted properties (빔틸트 특성을 갖는 하이패스 안테나의 개발)

  • Han, Yoon-Ku;Chong, Su-Jin;Lim, Gye-Jae
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.1 no.2
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    • pp.57-63
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    • 2008
  • In this paper, we develop the Hipass antenna that is used in electronic tall-gate charging (ETC) system in Korea expressway. This antenna has circular polarized characteristics, and especially has 45 degree tilted beam properties. These properties are very effective in ETC communication between the vehicle antenna and the tall-gate antenna. To achieve these properties on a small microstrip type antenna structure, we propose a annular ring microstrip antenna with stubs. When the length and angle of stubs are changed, the direction of the circular polarized beam is generally tilted by $45^{\circ}$ in elevation angle. Especially, by using the stubs in inner area or outer area of ring antenna, it is found that the beam direction of in azimuth angle can be rotated.

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Improvement of Smart Antenna System Performance Using virtual antennas (가상안테나를 이용한 스마트 안테나의 성능개선)

  • 임채현;문성훈;한동석
    • Proceedings of the IEEK Conference
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    • pp.49-52
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    • 2001
  • A virtual antenna system is presented to increase the channel capacity of a smart antenna in cdma2000. Although a smart antenna system can increase channel capacity by forming a beam to a desired user direction, an increase of channel capacity is limited by the number of antenna elements. A virtual antenna is proposed to improve the channel capacity by increasing the degree of freedom. The results show that the proposed system has a larger channel capacity than a conventional smart antenna system for the same number of antenna elements.

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Active Shark Antenna for the Vehicle AM/FM/TDMB/GPS Receiver (자동차용 AM/FM/TDMB/GPS 통합 능동형 샤크 안테나)

  • Kim, Joo-Man;Son, Tae-Ho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.6
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    • pp.698-705
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    • 2010
  • A vehicle antenna for AM, FM, TDMB, GPS systems was designed and implemented. Omnidirectional AM antenna was designed by ferrite turn style antenna. For the FM and TDMB antenna, folded monopole antenna which helical is folded was applied. GPS antenna for the bandwidth achievement was designed by trapezoidal microstrip patch that has air substrate. Receiving signal strengths by the measurement were presented for the AM, FM and TDMB antenna. AM signal strength was -65.7 dBm, this strength is almost as same conventional pole antenna as -63.4 dBm. It can be replaced conventional pole or glass antenna by the studied antenna. Signal strengths for FM and TDMB were -55.66 and -43.50 dBm at center frequency, they are 5~10 dB higher than conventional antenna. Measurements of bandwidth and gain for the GPS antenna showed 135 MHz under VSWR 2 : 1 and 4.31 dBi, gains over GPS band were 3~5 dB higher than ceramic patch antenna.

Design of the Wide-Band Printed-Monopole Antenna Using Parasitic Elements (기생 소자를 이용한 광대역 프린트 모노폴 안테나의 설계)

  • Seo, Seung-Up;Lee, Yun-Bok;Yang, Myo-Geun;Seong, Won-Mo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.7
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    • pp.719-725
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    • 2008
  • In this paper, we have proposed a printed monopole antenna using parasitic elements. The broadband characteristics of the antenna is obtained by using the printed monopole and parasitic elements. To confirm the broadband characteristics of the antenna, of have designed and fabricated the proposed antenna. The return loss and radiation patterns are measured in the frequency range of$0.8{\sim}1.2\;GHz$. The measured results show that the proposed antenna has return loss less than -10 dB in the operating frequency band and the radiation pattern is the dipole-like patterns. The antenna gain varies from 1.7 to 4.6 dBi in the operating frequency band. Thus, the proposed antenna can be used for the broadband repeater antenna $0.806{\sim}0.960\;GHz$(TRS-800, CDMA and GSM-900).

Image Procession Algorithm For Antenna Extraction And Correction (안테나 추출및 보정을 위한 영상처리 알고리즘)

  • Kwak, Nae-Joung;Ryu, Sung-Pil;Song, Teuk-Seob;Kim, Sung-Min
    • The Journal of the Korea Contents Association
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    • v.9 no.12
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    • pp.546-555
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    • 2009
  • There is increasingly interested in the measurement of antenna's characteristics for one's manufacture according to one's various application. Due to this, the antenna measurement system need be made with more and more great precision. On measuring of the antenna's characteristic, the conventional system handled by human generates the error due to controlling the position of the system by user. Therefore there need be introduced the automatic measurement system of antenna's characteristic. In this paper, we propose antenna extraction algorithm for the Antenna automatic measurement system of antenna's characteristic. The proposed algorithm gets the antenna image from antenna measurement system, extracts an antenna object from the image, and extracts the parameters for antenna's slant and antenna's location. The extracted parameters is used to correct location and distortions of the antenna and automatic measurement. The proposed algorithm is applied to the patch antenna. The results show that antenna's object is efficiently extracted and the angle for correcting the error is calculated well.

Shark Antenna for Vehicle TDMB and GPS Receiver (TDMB 및 GPS 수신용 전장용 샤크 안테나)

  • Kim, Joo-Man;Son, Tae-Ho
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.7 no.6
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    • pp.57-62
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    • 2008
  • In this paper, a folded helical monopole antenna for TDMB receiving and a trapezoidal fractal microstrip patch antenna for GPS were designed and fabricated for the vehicle shark antenna. To minimize null which is generating toward antenna axis direction and to receive both vertical polarization and horizontal polarization for TDMB antenna, we fold 90 degree helical monopole element. GPS antenna to get wide bandwidth and gain improvement was designed an air substrate trapezoidal microstrip patch antenna. Fabricated TDMB and GPS antenna were measured for S11 and radiation pattern, and compared with a commercialized antenna. TDMB antenna shows 3 dB higher antenna gain and receiving signal strength than the commercial one. GPS antenna shows the gain of 4.31 dBi at the resonant frequency, which is $3{\sim}5\;dB$ higher gain over whole operating band and 135MHz wide bandwidth at 2:1 VSWR than the conventional ceramic antenna.

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Design and Implementation of a Internal Mobile Antenna for TDMB and KPCS (TDMB와 KPCS 대역을 지원하는 내장형 휴대폰 안테나의 설계 및 구현)

  • Park, Jun-Han;Lee, Chi-Woo;Yang, Myo-Geun;Seong, Won-Mo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.2
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    • pp.161-166
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    • 2009
  • In this paper, we propose the internal mobile antenna for TDMB and KPCS. The proposed antenna is made of different dielectric substrate and it has small size ($45{\times}8{\times}8\;mm$, about 2.8 cc) for mobile device. TDMB antenna is designed spiral structure that makes maximum current for each cell and KPCS antenna is PIFA that is usually used for internal antenna. In order to compensate length of resonance TDMB antenna has a large inductor above 100 nH. In this case, the inductor isolate KPCS signal at TDMB by cutting high frequency. Also the antenna has good isolation because TDMB radiator is parasitic element in KPCS band. We simulated the antenna by using CST microwave studio and measured performance of the antenna in anechoic chamber Proposed antenna has $-6{\sim}-14\;dBi$ gain for TDMB and $-3.5{\sim}-5\;dBi$ gain for KPCS.

A Study on Folded Monopole Antenna with Spiral Shape for Wireless DVI Dongle Applications (무선 DVI 동글장치를 위한 스파이럴 구조를 갖는 폴디드 모노폴 안테나에 관한 연구)

  • Lee, Jae-Choon;Lee, Yun-Min
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.1
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    • pp.72-75
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    • 2016
  • In this paper, we proposes a internal antenna for wireless DVI dongle device using the folded monopole structure. The proposed antenna uses a basic structure of spiral and monopole. The antenna optimized for parameters length, gap, width, and rectangle of folded monopole antenna using the spiral structure. To confirm the characteristics of the antenna parameters, HFSS from ANSYS Inc. was used for the analysis. We used an FR4 dielectric substrate with a dielectric constant of 4.4. The DVI dongle size of the proposed antenna is $50{\times}40{\times}1.6mm$, and the size of the antenna area is $10{\times}40mm$. There is a value of return loss less then -10dB in 2.4GHz and 5.8GHz, band and the maximum antenna gain is -4.13dBi. The utilization possibility of the wireless DVI Dongle antenna have a folded monopole with spiral shape could be confirmed according to compare and analyze the simulation and measurement data.

Analysis and modeling of DGPS antenna performance depending on the DGPS site environment (DGPS 기준국 사이트 환경에 따른 안테나 성능 모델링 해석)

  • Kim, Young-Wan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.5
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    • pp.1022-1027
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    • 2014
  • Based on the modeling of DGPS antenna and antenna site environment, the DGPS short-monopole antenna performance according to the antenna surrounding environment are analyzed in this paper. The DGPS antenna site modeling that considers the ground conductivity and radio wave obstacles is performed and the general requirements for DGPS antenna site are proposed. In case of antenna site with proper radials on the ground plane of the fixed scale, the effect for antenna matching network due to the ground conductivity and radio wave obstacles is small but the impact on the radiation efficiency is large. To provide the stable DGPS service, it is important to install the DGPS antenna on the flat ground plain with good conductivity and without radio wave obstacles.

Antenna Placement Designs for Distributed Antenna Systems with Multiple-Antenna Ports (다중 안테나 포트를 장착한 분산 안테나 시스템에서의 안테나 설계 방법)

  • Lee, Changhee;Park, Eunsung;Lee, Inkyu
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37A no.10
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    • pp.865-875
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    • 2012
  • In this paper, we optimize antenna locations for a distributed antenna system (DAS) with distributed antenna (DA) ports equipped with multiple antennas under per-DA port power constraint. Maximum ratio transmission and scaled zero-forcing beamforming are employed for single-user and multi-user DAS, respectively. Instead of maximizing the cell average ergodic sum rate, we focus on a lower bound of the expected signal-to-noise ratio (SNR) for the single-cell scenario and the expected signal-to-leakage ratio (SLR) for the two-cell scenario to determine antenna locations. For the single-cell case, optimization of the SNR criterion generates a closed form solution in comparison to conventional iterative algorithms. Also, a gradient ascent algorithm is proposed to solve the SLR criterion for the two-cell scenario. Simulation results show that DAS with antenna locations obtained from the proposed algorithms achieve capacity gains over traditional centralized antenna systems.