• Title, Summary, Keyword: Base Station Antenna

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Design of the Pattern Adjustable Base Station Antenna for WCDMA Applications

  • Lee, Sang-Ho;Lee, Jung-Nam;Lee, Don-Shin;Park, Jong-Kweon;Kim, Hak-Sun
    • Journal of electromagnetic engineering and science
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    • v.8 no.2
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    • pp.64-69
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    • 2008
  • In this paper, we have proposed the pattern adjustable base station antenna for WCDMA applications. The proposed antenna consists of an omni-antenna(sleeve monopole) and two movable reflectors. The two reflectors can be controlled by mechanically and used to adjust the horizontal pattern of the base station antenna. The antenna was designed, fabricated, and measured. The antenna covers the entire WCDMA band for VSWR<1.4. The measured antenna gain is more than 15 dBi over the operating frequency range. By changing the angle (a) and the distance (d) of the antenna, the pattern adjustment of the proposed base station antenna is found to be possible.

An Effective Coverage Extension Scheme for Trisector Cellular Systems using Multi-hop Relay based on IEEE 802.16j (IEEE 802.16j 기반의 중계기를 도입한 3섹터 셀룰러 시스템에서 효율적인 기지국 커버리지 확장 기법)

  • Yoo, Chang-Jin;Kim, Seung-Yeon;Cho, Choong-Ho;Lee, Hyong-Woo;Ryu, Seung-Wan
    • Journal of KIISE:Information Networking
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    • v.37 no.4
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    • pp.294-300
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    • 2010
  • In this paper, We analysis of effective coverage extension for Tri-sector cellular systems using Multi-hop Relay based on IEEE802.16j system. In the proposed international standard of IEEE 802.16j MMR (Mobile Multi-hop Relay) use of the omni-directional antenna, 3-sector and 6-sector antenna is considered to Base Station and Relay Station. Omni-directional antenna service can offer as all directions but a throughput decreases due to the signal interference of near Relay Stations. In the directional antenna, cause of an interference with the base station which it arranges an antenna so that a beam can have the direct and does with neighbor Base Station and Relay Station can be reduced interference, therefore the effective throughput is higher than the omni-directional antenna system. But, In case of Base Station and Relay Station use the directional antenna, the efficiency which the directional antenna has the Co-channel interference due to in the different cell by the channel reuse is decreased. In this study, we propose the structure of arranging the Base Station and Relay Station having the directional antenna in the NBTC, WBTC antenna in a multi-tier. It compared and analyzed with the mode that the multi-hop Relay Station has the omni-directional antenna, Relay Station are used the NBTC antenna and the WBTC antenna system also, We analyze a relation between the performance degradation and the cell coverage extension which it follows because the number of hop in the multi-hop Relay Station.

The Analysis of beam tile pattern properties of the base station array antenna (기지국 배열안테나의 빔틸트 패턴특성 분석)

  • Choe, Jeon-hwan;Lim, Gye-jae
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.3 no.4
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    • pp.76-82
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    • 2010
  • For the purpose of controlling the beam tilt angle of the base station sector array antenna, phase shifter is used. Phase angles of this antenna depending on the tilt angles are designed, and the patterns on the vertical and horizontal planes are simulated and analyzed for the evaluation of base station antenna. This analysis is used in the optimal design of base station antenna because of maximum cell coverage and incremented traffic capacity, decreased interference.

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The Development of Near-field Probing Method on the Base Station Array Antenna (기지국 배열안테나의 근역장 프로빙 방법의 개발)

  • Lim, Gye-jae
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.2 no.1
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    • pp.65-72
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    • 2009
  • For the evaluation of far-field performance by using the near-field probing on the base station dipole array antenna, the effects of mutual coupling depending on the heights between the array antenna with reflector and the probe were analyzed. When the height is varied in the near-field region, S parameters on the input ports of antenna and probe are measured and analyzed to decide the height for the minimum mutual coupling effect and the maximum probing efficiency. This height will be applicable to the near-field probing system design to achieve the precision far-field performance of a base station array antenna system.

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Dual-Polarized Small Base Station Antenna Integrated RF Module Applicable to Various Cell Environments for Next-Generation Mobile Communication Service

  • Lee, Jung-Nam;Lee, Yuro;Park, Bong-Hyuk;Kim, Tae-Joong
    • ETRI Journal
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    • v.39 no.3
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    • pp.383-389
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    • 2017
  • A small dual-polarized base station antenna with a simple isolation patch is presented. A high isolation is achieved when using a shorted metallic isolation patch. The experimental results indicate that the measured impedance bandwidth of the proposed antenna is 1.72 GHz to 1.89 GHz for small cell systems and that the isolation is more than 30 dB. The proposed antenna exhibits good radiation patterns with a peak gain of 8 dBi.

Erlang and Channel Capacity of Truncated Power Controlled CDMA Cellular Systems with Base Station Antenna Arrays

  • Kim, Nam-Soo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.10A
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    • pp.788-795
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    • 2003
  • We analyze the performance of a truncated power controlled CDMA(code division multiple access) cellular systems with base station antenna arrays. Erlang capacity and the channel capacity which is a maximum date rate to maintain almost error free communication are analytically derived. The numerical results show there can be a substantial increase in Erlang capacity and in channel capacity by antenna arrays incorporating with the truncated power control scheme.

The effect of imperfect power control on the capacity of reverse channel in cellular CDMA system with antenna arrays (안테나 배열을 이용한 CDMA 셀룰라 시스템에서 불완전 전력제어가 역방향 채널 용량에 미치는 효과)

  • 김씨알;오성근
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.21 no.2
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    • pp.471-482
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    • 1996
  • In this paper, we analyze the effect of imperfect power control on the capacity of the reverse channel in CDMA cellular system with antenna arrays in the base station. For imperfect power control, we assume that the received power at the base station from the users within each cell has log-normal distribution, and we also consider the effect of imperfect power control of co-channel interferences which arise from both its own cell and outer cells. From the result of numerical analysis, we show that the degree of power control gives a great influence on the capacity of CDMA celluar system with antenna arrays, and also that antenna arrays at the base station can improve greatly the system capacity even when the power control is imperfect.

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EIRP Measurements of WCDMA Base Station Using Pilot Channel in Line-of-Sight Environments (가시선 환경에서 Pilot 채널을 이용한 WCDMA 기지국의 EIRP 측정)

  • Jang, Byung-Jun;Moon, Sung-Won;Lim, Jae-Bong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.5
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    • pp.545-551
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    • 2011
  • In this paper, we described a measurement method of an EIRP(Effective Isotropic Radiated Power) of a WCDMA base station using a pilot channel in line-of-sight environments. Especially we measured it in real base station environments in order to apply this method to domestic base station inspection test. Estimated EIRP results from measured value is -2 dB lower than theoretical values, which is calculated by the data of transmit antenna. The deviation of -2 dB is verified as a polarization mismatch between the base station antenna and a receiver antenna, and it can be calibrated. Therefore, we verified that our measurement method could be an effective tool to measure an EIRP in WCDMA base station inspection test.

A Study on Design of the Electrical Down Tilting Antenna with Shaped Beam Pattern (성형 빔 패턴을 갖는 전기적인 다운 틸팅 안테나의 설계에 관한 연구)

  • Lee Chang Eun;Hur Jung
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.42 no.1
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    • pp.111-118
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    • 2005
  • The shape of vertical pattern of base station antenna affects greatly quality of the communication of not only a service zone but also adjacent cells and then it is an important point to be considered in designing cell coverage. Currently type of vertical patterns to be applied to base station antenna are divided into five classes. In designing antenna, these five classes are applied solely or compositely according to the environment to be used antenna. In this paper, the dual polarized antenna for base station that is with a continuous electrical down tilting and with a shaped beam pattern, that an upper side lobe is suppressed and a lower null is filled, is designed and fabricated for synthesizing of the shape beant the pattern synthesis methods proposed by R. S. Elliott is used sequentially and for the electrical don tilting, the phased array theory is applied. Measured results show the down tilting range from 0° to 14°, the gain of Min. 13.3dBi and the upper side lobe of Max. -23dB. And we verified that upper side lobe is not to vary greatly and null filling performance is favorable overall.

EBG Resonator Antenna with a Stripline Type FSS Superstrate for PCS-band Base Station Antennas (스트립라인 형태의 주파수 선택적 표면 덮개층을 이용한 PCS대역 기지국용 EBG 공진기 안테나)

  • Yeo, Jun-Ho;Kim, Dong-Ho
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.45 no.8
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    • pp.15-27
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    • 2008
  • In this paper, an EBG(Electromagnetic BandGap) resonator antenna with a stripline type FSS(Frequency Selective Surface) superstrate for PCS-band base station antennas is proposed. The characteristics of resonant frequency and -3dB bandwidth of a unit cell of a superstrate are first analyzed by varing several design parameters such as a strip width and a unit cell width in order to design an EBG resonator antenna satisfying the required antenna gain and bandwidth for PCS-band base station antennas. Among various unit cell shapes, strip dipole and stripline are considered and their characteristics are compared. It was found that a resonant length of the EBG resonator antenna becomes smaller when the stripline shape is used and the control of the bandwidth is also much easier. By using the unit cell simulation results, planar and cylindrical EBG resonator antennas at PCS-band are designed.