• Title, Summary, Keyword: PCS 단말기

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Design of Triple-band Internal Antenna for the Mobile Phone (휴대폰 3중 대역 내장형 안테나 설계)

  • Oh, Kyu-Jong;Son, Tae-Ho
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.11 no.4
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    • pp.171-174
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    • 2011
  • In this paper, transformed IFA design is proposed to improve the antenna gain of GSM/DCS/PCS band. New antenna structure has been approved to be more convenient matching in the mobile phone terminal and increase gains and expansion bandwidth through the simulation and real measurement. According to measurement, it's shown 1.57dB higher average gain than conventional IFA.

Design of a Triplexer for Mobile Communication (AMPS, GPS, US-PCS 대역용 Triplexer 설계)

  • 이재선;윤태순;김기병;이종철;박재영;고영준
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.4
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    • pp.327-334
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    • 2004
  • In this paper, a triplexer for Advanced Mobile Phone Service(AMPS), United States-Personal Communication Services(US-PCS), and Global Positioning System(CPS) is designed using L and C lumped elements. The triplexer shows the insertion loss of 0.6 ㏈, 1.1 ㏈, and 1.6 ㏈ for AMPS, US-PCS, and GPS bands, respectively. Also, it shows the attenuation characteristic of less than 18 ㏈, and the VSWR of less than 2.0 through the all pass-band.

Design and Implementation of WPKI Using Embedded Linux on the Wireless Internet (무선인터넷 상에서 Embedded Linux를 이용한 WPKI의 설계 및 구현)

  • 박상현;강찬휘;신승호
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.9
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    • pp.67-71
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    • 2004
  • Because the Internet diffusion has been increased, the service that used at the offline has been applied to the online, the saving time and portability has been emphasized, and the service has been increased from the wire to the wireless by the development of the mobile communication technology. There are a Pocket PC, Palm and so forth as devices that are used for it and the services are already used. However, because it is used at only limited operating systems like PCs have, there is the restriction to use for much more users. In order to allow various devices used by much more people the access services, the WPKI authentication should be implemented for devices using Linux OS.

Performance Analysis of Mobile Station with Built-in Antenna for PCS Band (PCS 대역용 안테나 내장형 단말기의 성능 분석)

  • Kong, Sung-Shin;Oh, Jong-Dae;Yang, Woon-Geun
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.560-564
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    • 2003
  • In this paper, we carried out performance analysis of mobile station with built-in antenna for PCS(Personal Communication System) band. The radiation patterns for antenna and mobile phone were simulated by using 3D simulation program, HFSS(High Frequency Structure Simulator) and SEMCAD(Simulation Platform for Electromagnetic Compatibility Antenna Design Dosimetry). We observed radiation pattern variation according to installation of LED(Light Emitting Diode) circuit and ground pattern. The radiation pattern of prototype mobile phone was measured, and the radio sensitivity was measured by using Agilent E5515C and chamber. The measured maximum antenna gain at 1.87GHz was 0.21dBi. The measured radio sensitivity of prototype mobile phone shows proper performances comparable to other models with external antennas.

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SAR analysis with variety of the antenna structures on PCS handset (PCS 전화기의 안테나 구조에 따른 SAR 분석)

  • Kim, Hyoun-Kyoung;Park, Ju-Deok;Kim, Jin-Seok;Kim, Nam
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.37 no.11
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    • pp.8-16
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    • 2000
  • In this paper, on calculating SARs on human head using computer simulation, SARs caused by PCS handsets are calculated and compared, and the design parameters that affect SAR values are analyzed. Is and 10 g peak averaged SARs are calculated as the type of antenna, the location of antenna, and the type of handset are changed and SAR distributions as depth of human head are shown. Among the antennas on flip type handsets, side mounted PIFA has the lowest SARs 1g and 10g peak averaged SARs are 0.686W/kg and 0.353W/kg. The SARs caused by monopole antenna on folder type handset are 1.133W/kg and 0.709W/kg. and are about 30% lower than monopole 1.759W/kg and 0.978W/kg, respectively. SAR distributions as depth of human head of side mounted PIFA and monopole antenna on folder-type handset are more slowly changed than those of top mounted PIFA and monopole antenna on flip-type handset.

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Manufacture of a single gate MESFET mixer at PCS frequency band (PCS 주파수 대역 단일 게이트 MESFET 혼합기의 제작)

  • 이성용;임인성;한상철;류정기;오승엽
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.9 no.1
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    • pp.25-33
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    • 1998
  • In this paper, we describe a single-gate MESFET mixer at PCS(Personal Communication Service) frequency band. The PCS frequency band is 1965~2025 MHz in FR and 140 MHz in IF irrespectly. The design of the mixer was executed by microwave simulator, EEsof Libra. The matching network is consisted of rectangular inductor, MIM capacitor and open stub. The ma- nufacture work was accomplished by the micro-pen and wedge-bonder. The mixer showed $6.69\pm0.65$ dB of conversion gain, $-14.9\pm3.5$dB of RF reflection coefficient and 57.83 dB of LO/IF isolation at 10 dBm of LO power when LO frequency is 1855 MHz. When this mixer is used at PCS terminal, IF-amplifier which compensates the conversion loss of diode mixer may be omitted.

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A Pointer Forwarding Scheme for Fault-tolerant Location Management in Mobile Networks (이동망에서 결함 허용 위치 관리를 위한 포인터 포워밍 방법)

  • Lee, Kyung-Sook;Ha, Sook-Jeong;Chun, Sung-Kwang;Bae, Ihn-Han
    • The KIPS Transactions:PartC
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    • v.11C no.3
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    • pp.387-394
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    • 2004
  • One of the main challenges in personal communication services(PCS ) Is to locate many mobile terminals that nay move from place to place frequently. This kind of system operation is called location management. This task entails sophisticated signaling traffic and database queries. Several strategies have been proposed to improve the efficiency of location management. These strategies use location register databases to store the current locations of mobile terminals, and are vulnerable to failure of the location register databases. In this paper, we propose a fault-tolerant pointer forwarding scheme with distributed home location register in order to tolerate the failure of location registers. The performance of the proposed scheme is evaluated analytically by simulation, and Is compared with Biaz's bypass forwarding strategy and two-path forwarding strategy.

Performance of cellular CDMA system for voice/data integrated service (음성/데이타 집적서비스를 위한 CDMA 셀룰러 시스템의 성능 연구)

  • 강군화;조동호
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.19 no.9
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    • pp.1748-1758
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    • 1994
  • Recently, the demand of mobile communication is rapidly increasing. Also, not only the voice service but also the nonvoice services such as data, FAX, and image service are required. Therefore, in this paper, the voice/data intergraed service methods that will be utilized as a basic core technology of the PCS systems are proposed and their performances are analyzed and compared by computer simulation. According to the simulation results, it could be seen that the performance of voice/data integrated PR-CDMA method is better than that of voice/data integrated broadband CDMA method using a dedicated terminal or a voice/data integrated terminal. The reason is that the voice/data integrated PR-CDMA method can overcome the weak points of CDMA protocol, such as a limitation of the fixed CDMA logical channel number and a falling-off in channel utilization, by using PRMA protocol as a multiple access method that the terminals to which a CDMA logical channel is assigned compete.

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Design and fabrication of a Triple Band Internal Antenna for Handset (휴대용 내장형 트리플(DCS, PCS, UPC5) 안테나 설계 및 제작)

  • Park, Seong-Il;Ko, Young-Hyuk
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.681-684
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    • 2008
  • In this paper, triple band mobile chip antenna for DCS($1.71{\sim}1.88GHz$) / PCS($1.75{\sim}1.87GHz$) / UPCS($1.85{\sim}1.99GHz$) on PCB Layout is fabricated. As designed and fabricated antenna is loaded PCB layout, that plate a both side at two independence patterns(upper & lower) to reduce the size and a capacitor for DCS, PCS, UPCS band is proposed. The antenna has a small size of about $19mm{\times}4mm{\times}1.6mm$, narrow bandwidth which is the defect of chip antenna is improved. Bandwidth of fabricated antenna to VSWR less than 2 is satisfied and all bandwith is acquired 15.1 % at $1.71GHz{\sim}1.99GHz$.

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