• Title/Summary/Keyword: RF cable

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COMS SYSTEM LEVEL RF COMPATIBILITY TEST SYNTHESIS

  • Lim, Hyun-Su;Park, Durk-Jong;Yang, Hyung-Mo;Ahn, Sang-Il
    • Proceedings of the KSRS Conference
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    • 2007.10a
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    • pp.500-503
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    • 2007
  • During the COMS system level test, the RF compatibility will be performed in order to verify that there is no issue in RF interface between satellite and COMS ground station, namely SOC (Satellite Operation Center) before the launch. As used for KOMPSAT1, the RF coaxial cable was chosen to be used to connect satellite and SOC with various advantages as compared with ground antennas. As the preparation step, RF cable and required multiplexer were tested in advance. This paper suggests the way for the RF compatibility tests between the satellite and the SOC over RF cable interface and presents the estimated level diagram as the signal power analysis result.

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Design of RF Supporting Unit for COMS RF Compatibility Test (COMS RF호환성 시험을 위한 RF지원 장비의 설계 및 제작)

  • Park, Durk-Jong;Park, Chun-Woo;Ahn, Sang-Il
    • Aerospace Engineering and Technology
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    • v.7 no.2
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    • pp.176-186
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    • 2008
  • As determined single coaxial cable for the interface between satellite and ground station in COMS RF compatibility test, RF supporting unit was required to allow signals in different frequency-band to be exchanged in the single coaxial cable. In addition, the path loss between satellite and ground station in normal operation should be simulated through two RF supporting units connected to the ends of single coaxial cable. As an effort to design RF supporting unit, level diagram was firstly conducted on the basis of measured data for each element. From the level diagram, it was found that single coaxial cable connected with two RF supporting units properly represented the path loss between satellite and ground station After RF supporting unit was integrated on aluminum plate, it was tested that input signal level at each test cap linked with MODCS and TC&R was tunable within the required dynamic range. RF supporting unit, now completely integrated, will be applied in the upcoming COMS RF compatibility test.

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On-line Test Equipment for Cable Joint by RF Sensing (RF 감지 방식 on-line 케이블 접속재 진단)

  • 이왕하;이성희;정희돈;김덕규;이동영
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.11
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    • pp.661-667
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    • 2003
  • It has little possibility that a cable causes any problem in electric power facilities. But when a trouble occurs in cable or cable joint, the damage is very severe. The main causes of the cable defections are bad cable making procedure, poor cable operation and deterioration according to the years. There are some cases to have potential problems due to many cable connection points, because of short length of cable, especially in 154㎸ system. In this study, novel method to measure partial discharge in cable joints is proposed and the effectiveness and the reliability of the proposed method is shown through experiment results of field.

Design and fabrication of the GPS antenna system including RF-stage (RF 수신부를 내장한 GPS 안테나 시스템의 설계 및 제작)

  • 홍성일;이정호;변건식;정만영
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.33A no.6
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    • pp.99-107
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    • 1996
  • When GPS (global positioning system) is used as synchronous signal in CDMA digital cellular base station system and high speed digital synchronous communication network, antenna cable length is increased, comparing with other GPS application such as positioning or car navigation. In this paper, it is proposed that a type of new GPS antenna system including RF stage for reduction of cable loss in case of long cable.The antenna system with TMPA(truncated-corners microstrip patch antenna) is designed and fabricated because GPS signal has RHCP (right-hand circular polarization), consequently antenna size can be made small size. LNA (low noise amplifier) is designed by using HEMT(high electron mobility transistor)which has lower noise figurae and better AGC characteristics at low voltage than GaAs FET, and we equiped mixer, in GPS antenna unit, which converts from 1575.42MHz to 75.42MHz. As result of comparing between typical system and proposed system when cable length is 60m, 63dB, 55dB and 25dB gain are obtained for RG-316/U, RG-58C/U and RG-213/U, and better characteristics are achieved than typical system as far as cable length is longer.

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Study on the Building Method of a Sensor Network based on BLE Beacons with WPTS (WPTS BLE 비콘 기반 센서 네트워크 구축 방안 연구)

  • Jang, Ho-Deok
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.15 no.1
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    • pp.8-13
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    • 2022
  • This paper investigates the method to implement a RF (Radio Frequency) energy harvesting sensor node and to build a sensor network using a CATV network and a leaky coaxial cable. The power supply of a sensor node is designed with the WPTS (Wireless Power Transfer System) receiver operating at 915MHz. A sensor network has limited coverage by the loss of RF signal at a wireless transmission link. The paper proposes to build a sensor network that the BLE signal of a sensor and the signal of a WPTS power transmitter are transmitted through a coaxial cable of a CATV network by utilizing WOC (WiFi over Coax) technology and radiates at a leaky coaxial cable. The length of a leaky coaxial cable and the total loss of a wire link are allowed to the point that the RSSI of a sensor node is more than the minimum value (-78dBm) and lead to extend wireless coverage.

Surface Transfer Impedance Measurement of RF Cable according to IEC Standard 96-1 (IEC Standard 96-1에 따른 RF 케이블의 표면전달 임피던스 측정)

  • 강진섭;김정환;강웅택;박정일
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.11 no.6
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    • pp.886-892
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    • 2000
  • In this paper, surface transfer impedance measurement of RF cables according to IEC(International Electrotechnical Commission) Standard 96-1 is described and surface transfer impedance of a commercial RF cable is obtained from the measured voltage and scattering parameter with a triaxial fixture fabricated in the operating frequency range from 1 MHz to 30 MHz.

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An RF Front-end for Terrestrial and Cable Digital TV Tuners (지상파 및 케이블 디지털 TV 튜너를 위한 RF 프런트 엔드)

  • Choi, Chihoon;Im, Donggu;Nam, Ilku
    • Journal of the Institute of Electronics and Information Engineers
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    • v.49 no.12
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    • pp.242-246
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    • 2012
  • This paper presents an integrated low noise and highly linear wideband RF front-end for a digital terrestrial and cable TV tuner, which are used as a part of double-conversion TV tuner. The low noise amplifier (LNA) has a low noise figure and high linearity by adopting a noise canceling technique based on current amplification. The up-conversion mixer and SAW buffer have high linearity by employing a third order intermodulation cancellation technique. The proposed RF front-end is designed in a $0.18{\mu}m$ CMOS and draws 60 mA from a 1.8 V supply voltage. The RF front-end shows a voltage gain of 30 dB, an average single side-band noise figure of 4.2 dB, an IIP2 of 40 dBm, and an IIP3 of -4.5 dBm for the entire band from 48 MHz to 862Hz.

DVB-H/GSM/DCS/PCS band internal antenna for mobile handheld communication systems

  • Jung, Byung-Woon
    • Journal of information and communication convergence engineering
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    • v.6 no.2
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    • pp.169-171
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    • 2008
  • An internal antenna for small mobile systems is proposed to support the DVB-H system. It consists of two antenna elements, which are a folded planar monopole for DVB-H and PIFA for GSM/DCS/PCS, and a meander line and RF cable are used to increase the ground plane. Experimental results of the antenna are presented.

RF COMPATIBILITY TEST BETWEEN KOMPSAT AND TTC STATION

  • Ahn, Sang-Il;Choi, Hae-Jin
    • Journal of Astronomy and Space Sciences
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    • v.16 no.2
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    • pp.191-198
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    • 1999
  • Results of RF compatibility test between KOMPSAT(Korea Multi-Purpose SATellite) and TTC(Tracking, Telemetry, and Command) station are described. S/C(Spacecreft) RF Test, telemetry test, command test, ranging test, and tracking receiver test were performed with respect to pass/fail criteria. To provide physical RF interface between KOMPSAT and TTC equipment, direct low cable and antenna-to-antenna interface were implemented. Through RF compatibility test, it was fully demonstrated that KOMPSAT and TTC equipment are functionally workable.

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A Study on RF/PON Transmission System for CableTV Network Upgrade (케이블TV 네트워크 고도화를 위한 RF/PON 전송시스템에 관한 연구)

  • Ahn, Byoung-Jun;Park, Sung-Kwon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39B no.8
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    • pp.510-517
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    • 2014
  • Recently, Cable communications services are becoming the HDTV to 3DTV, UHDTV broadcasting and 100Mbps to 1Gbps Internet. however existing technologies are limited to provide high-quality broadband services in the HFC network. The network upgrade technologies have some problems that Up/Downsteam frequency extension, Cost of upgrading by using DOCSIS3.1, EPOC and Legacy STB compatibility, Cost of upgrading the network by RFoG, RF overlay PON. This paper propose the RF/PON based gigabit Transmission system in order to provide the 1Gbps internet without using frequency and the Multiscreen to IP devices. After the proposed RF/PON system was developed and implemented, this paper evaluate the performance of RF/PON system for simultaneously real-time braodcasting and 1Gbps internet, Multiscreen service, and so on.