• Title, Summary, Keyword: Sector Antenna

Search Result 46, Processing Time 0.036 seconds

Enhancement in BER Performance by Adaptive Sector Antennas in CDMA Wireless Multi-media Communications (CDMA 무선 멀티미디어 통신에서 적응형 섹터 안테나에 의한 오율성능 개선)

  • Lee, Ju-Hyung;Kim, Young-Chul;Oh, Chang-Heon;Cho, Sung-Joon
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.27 no.10A
    • /
    • pp.980-989
    • /
    • 2002
  • In this paper, we have proposed the sectorization method of the adaptive sector antenna and the new receiver structure for the CDMA wireless multi-media communication which uses multi-code and single-code. The sectorization and average BER performance of the adaptive sector antenna, which employs the proposed sectorization method, are obtained through simulation. The simulation results have shown that the sizes of sectors are properly controlled according to the distribution of the load and that the BER performance of the adaptive sector antenna is enhanced much more than that of the fixed sector antenna. Also, we have proposed two receivers, which are different from the positions to detect multi-code signals, for the multi-media communication. Each receiver has a simple cancellation scheme and two adaptive sector antennas, which are called the 1st adaptive sector antenna and the 2nd adaptive sector antenna, respectively. In this paper, the average BER performances of the receivers are compared through simulation. As the results of the simulation, we have recognized that all user' BER performances are greatly dependent on the positions to detect the multi-code signals. When we consider both system complexity and terget BERs of signals, we have concluded that the receiver, which detect multi-code signals in the 1st and the 2nd adaptive sector antenna, is appropriate for the CDMA wireless multi-media communication systems.

Disk Sector Antenna fed by CPW for UWB Communications (UWB 통신용 CPW 급전 디스크 섹터 안테나)

  • Lim, Jung-Hyun;Lee, Min-Soo;Yang, Doo-Yeong
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.10 no.2
    • /
    • pp.303-312
    • /
    • 2009
  • In this paper, we design and fabricate a disk sector antenna fed by CPW fur UWB communications. Also, we insert a rectangular slit on the arc-edge of the disk sector antenna. Then, the antenna has the directivity of E-면. In order to design the antenna, the input impedance is matched with the feed line of $50{\Omega}$ as varying the physical antenna parameters, which are the radius, the flare angle of disk sector, the length of ground, and the length of ground comer near by feed tine. Dimension of the antenna designed for UWB communication is $72mm{\times}26mm$ and bandwidth through computer simulation is $3{\sim}13GHz$. From the measured results, the bandwidth is $1.98{\sim}11GHz$. Return loss and gain of the fabricated antenna are -50.38dB, 1.34dBi at 3.5GHz, -12.27dB, 3.35dBi at 5.5GHz, -23.2dB, 3.8dBi at 8GHz and -16.17dB, 5.2dBi at 10GHz, respectively.

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
    • /
    • v.18 no.6
    • /
    • pp.620-628
    • /
    • 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.

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
    • /
    • v.37 no.4
    • /
    • pp.294-300
    • /
    • 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.

Dual-frequency circular sector patch antenna (이중 주파수 원형 섹터 패치 안테나)

  • 박동국
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.5 no.4
    • /
    • pp.812-816
    • /
    • 2001
  • In this paper we designed a dual-frequency circular sector microstrip antenna fed microstrip line with orthogonal polarization. The operating frequencies and polarization characteristics of the proposed antenna is calculated by using a cavity model. The antenna operating at about 1.87 GHz and 2.42 GHz is fabricated and its S-parameters and radiation patterns are measured.

  • PDF

Dual-frequency circular sector microstrip antenna (이중 주파수 원형 섹터 패치 안테나)

  • ;Tatsuo Itoh
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • /
    • pp.187-190
    • /
    • 2001
  • In this paper we designed a dual-frequency circular sector microstrip antenna fed microstrip line with orthogonal polarization. The operating frequencies and polarization characteristics of the proposed antenna is calculated by using a cavity model. The antenna operating at about 1.87 GHz and 2.42 GHz is fabricated and its S-parameters and radiation patterns are measured.

  • PDF

Efficient DC Power Management Scheme using 60-GHz Rectenna (60-GHz 렉테나를 이용한 효율적 DC 전력 관리 체계)

  • Lim, Sung-Joon
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.57 no.6
    • /
    • pp.1032-1035
    • /
    • 2008
  • In this paper, a DC power management scheme is proposed for efficient battery operation of 60-GHz receivers. It consists of a rectenna and a zero-cross detector. The harmonic rejection capability of a circular sector antenna is used to simplify the rectenna. The zero-cross detector is introduced to increase sensitivity. When the received power density is larger than 0.013 $mW/cm^2$, it can generate enough DC power to activate an RF receiver. Experimental data is used to verify the proposed idea.

Design of Transceiver Front-end using Circular Sector Patch Antenna (원형 섹터 패치 안테나를 사용한 트랜시버 전단부 설계)

  • ;Tatsuo Itohv
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.5 no.4
    • /
    • pp.807-811
    • /
    • 2001
  • In this paper we proposed a dual-frequency circular sector microstrip antenna with orthogonal polarized modes and high isolation between the two feeding ports. And then we designed a transceiver operating at 5.6 GHz for transmitting and at 5.5 GHz for receiving. The good isolation provided by the proposed antenna is used as the basis for the transmit-receive filtering of transceiver. The operating frequencies and polarization characteristics of the proposed antenna is calculated by using a cavity model. The 5-parameters and radiation patterns of the antenna are measured. A power amplifier and a low noise amplifier are designed and integrated with antenna to make a transceiver, which has about 13dB transmitting gain and about 8㏈ receiving gain.

  • PDF

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
    • /
    • v.8 no.2
    • /
    • pp.64-69
    • /
    • 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.

Localization Algorithm in Wireless Sensor Networks Using a Directional Antenna (지향성 안테나를 이용한 무선 센서 네트워크에서의 위치 인식 알고리즘)

  • Hong, Sung-Hwa;Kang, Bong-Jik
    • Journal of the Korea Society of Computer and Information
    • /
    • v.15 no.1
    • /
    • pp.111-118
    • /
    • 2010
  • The proposed algorithm to be explained in this paper is the localization technique using directional antenna. Here, it is assumed that anchor node has the ability to transfer the azimuth of each sector using GPS modules, sector antenna, and the digital compass. In the conventional sensor network, the majority of localization algorithms were capable of estimating the position information of the sensor node by knowing at least 3 position values of anchor nodes. However, this paper has proposed localization algorithm that estimates the position of nodes to continuously move with sensor nodes and traveling nodes. The proposed localization mechanisms have been simulated in the Matlab. The simulation results show that our scheme performed better than other mechanisms (e.g. MCL, DV-distance).