• Title, Summary, Keyword: PCS 단말기

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Design of Dual frequency Inverted-F Antenna with Spur Line (스퍼 라인을 이용한 이중 주파수 역 F형 안테나의 설계)

  • 허문만;윤현보
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.7
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    • pp.702-708
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    • 2002
  • In this paper, we design the dual frequency antenna that could easily determine two operation frequencies by its inverted-F antenna structure and spur line length. The spur line is applied to the inverted-F antenna, in order to dual operation characteristics in PCS and cellular frequencies. It has designed by using the IE3D commercial software based on the moment method. As the designed antenna is fabricated and measured, you can see the results such as the return loss, the input impedance, the radiation patterns, and the gain. The size of this antenna is 40 mm$\times$14 mm$\times$9.4 mm, it is compact enough to use as an intenna. Also, This antenna can be used with cellular and PCS phone of domestic market.

Study of FEM with integrated antenna (안테나를 집적한 FEM에 대한 연구)

  • Kim Jun-Kyu;Kang Sung-Won;Cheon Chang-Yul
    • 한국정보통신설비학회:학술대회논문집
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    • pp.189-192
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    • 2006
  • 본 논문에서는 안테나와 미국 PCS대역(1.85GHz-1.99GHz) FEM(Front End Module)을 결합하여 하나의 패키지로 구현하는 것을 연구하였다. FEM의 크기를 고려하여 안테나의 크기를 작게 만들고 단말기에 내장하기 위해 PIFA(Planar Inverted F Antenna)형식의 안테나를 선택하였다. 안테나의 지지를 위해 비유전율 2의 캐리어를 사용하였고, 안테나와 FEM간의 상호 간섭을 막기 위해 도체로 차폐시켰다. 유한요소법(Finite Element Method)로 모의 실험을 하여 안테나를 설계하고 실제 제작하여 모의 실험결과와 비교하였다. 제작한 안테나를 FEM과 결합, 기판을 제작하여 FEM의 이득을 측정하였다.

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Design of Dual-Band Chip Antenna using LTCC Multilayer Technology (LTCC 적층 기술을 이용한 이중대역 칩 안테나의 설계)

  • Kim Young Do;Won Chung Ho;Lee Hong Min
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.42 no.3
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    • pp.19-24
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    • 2005
  • This paper presents design simulation, implementation, and measurement of a miniaturized GPS/K-PCS dual-band LTCC chip antenna for mobile communication handsets. The dimension of LTCC chip antenna is $9mm\times15mm\times1.2mm$. The meander type radiating patch for dual-band operation is realized by using via holes with 0.3mm height to connect upper and lower-layer antenna. The lower meander type antenna is to be tuned to the lower frequency (GPS) band. The upper meander antenna with via hole connection is to contribute the higher frequency (K-PCS) band. The resonant frequency and frequency ratio of the proposed antenna can be adjusted by changing the height of via-hole and effective path of meander radiating patch. The electrical characteristics of the meander chip antenna applied to a GPS/K-PCS are suitable for mobile communication application.

Design of Internal Integrated Microstrip Patch Antenna for PCS Handset (PCS 단말기용 내장형 마이크로스트립 패치 안테나 설계)

  • Cho Dong-Ki;Park Kyeng-Tea;Lee Ho-Sang;Lee Mun-Soo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.5
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    • pp.792-797
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    • 2006
  • In this paper, an internal integrated microstrop patch for PCS handset is designed. To increase the bandwidth of microstrip patch antenna, a configuration of stacked type using parasitic element is used. Furthermore, to reduce the size of microstirip patch antenna, the main radiator in the substrate is shorted to the ground plane using five shorting-posts while three parasitic elements on the superstrate are also shorted to the ground plane using two shorting-posts respectively. The antenna bandwidth and radiation characteristics are calculated by HFSS 7.0 software, and compared with the experimental results. Experimental results show that the return loss is less than -10dB over the band of 1766MHz to 1900 MHz(134MHz) and the size of the fabricated microstrip patch antenna are $23\times20\times6.35mm$.

Design and Implementation Issues of Scalable WAP Gateway for Web Services at Mobile Environment (이동 환경에서 웹서버를 위한 WAP Gateway의 디자인과 구현 이슈)

  • 강성훈;한영태;민덕기
    • Proceedings of the Korean Information Science Society Conference
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    • pp.481-483
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    • 2000
  • PCS, Digital Cellular, CDPD, 그리고 Handheld PC와 같은 휴대단말기를 사용해 각종 정보망의 서비스를 받으려면 움직임이 점차 커지고 있다. 이에 발 맞추어 일반 이동단말기에서 인터넷을 접속 할 수 있는 여러 기술들이 개발되었으며, 현재 사용하는 것으로 Unwired Planet 사가 개발한 HDML(Handheld Device Markup Language)기술이 있고, WAP Forum에서 제시한 WAP(Wireless Markup Language)가 있다. WAP의 구조에서 가장 핵심적인 요소로서 WAP Gateway가 있으며, 현재까지 WAP Gateway에 대한 특별한 표준화가 이루어지지 않은 단계에서 각 컨텐츠 사업자가 WAP Gateway를 나름대로 구현하고 사용하는 실정이다. 본고는 보다 확장성을 가지고 무선이라는 환경에 적합하도록 서비스를 개선할 수 있는 WAP Gateway의 설계 및 구현 이슈에 대하여 다룬다.

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PCS 이동단말기 인증을 위한 키분배 방법에 관한 연구

  • 박형일;강지훈
    • Korea Information Processing Society Review
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    • v.5 no.3
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    • pp.34-41
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    • 1998
  • AC(인증센터)의 주요한 기능은 이동국과 인증을 수행하고 이동국과 인증센터간에 사용하는 인증정보를 갱신하는 일이다 이러한 일을 수행하는 데 있어서 인증키의 교환 관리 분배는 가장 기본적인 것이라고 할 수 있을 것이다 KDS는 위와같이 인증에 관여하는 여러 블록중에서 특히 키의 생성 관리 분배 등을 맡고 있는 블록이다 즉 가입자의 인증키는 KDS에 의해서 생성되고 관리된다 KDS는 인증센터 내부에 하나의 블록으로 존재할수도 있고 인증센터와 분리될 수 도 있으므로 설계시 이 사항을 고려해야 한다 본 논문에서는 이동국과 인증센터간의 정확한 인증키의 공유(분배)를 위한 KDS의 역할 및 KDS와 주변블럭들간의 메시지 흐름을 설명한다.

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Design and fabrication of the surface mountable VCO operating at 3V for PCS handset (3V에 동작하는 PCS 단말기용 표면실장형 전압제어 발전기의 설계 및 제작)

  • 염경환
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.21 no.3
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    • pp.784-794
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    • 1996
  • In this papre, the design and the fabrication of the surface mountable voltage controlled oscillator is described for local oscillator in PCS(WACS/TDMA) handset. The VCO employs two silicon bipolar transistors of $f_{gamma}$ of 4 GHz as active devices. These are asembled to form the VCO on the 4 layer PCB of the size $12{\times}10mm$which provides the strip line resonator at the third layer. The fabricated VCO shows tuning rage over 50 MHz, phase noise -100 dBc/Hz at the 100 kHz frequency offset, and 0 dBm output power with the consumption of 22 mA at 3V. It is belived that the size will be more reduced by employing 1005 chip components and that the current consumption will be improved by employing transistors of higher $f_{gamma}$.

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Design and Fabrication of the Triple Band(DCS, PCS, UPCS) Internal Chip Antenna (내장형 트리플(DCS, PCS, UPCS) 칩 안테나 설계 및 제작)

  • Park, Seong-Il;Park, Sung-Ha;Ko, Young-Hyuk
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.7
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    • pp.1261-1266
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    • 2009
  • In this paper, triple band mobile chip antenna for DCS(1.71${\sim}$1.88GHz) / PCS(1.75${\sim}$1.87GHz) / UPCS(1.8S${\sim}$1.99GHz) on PCB Layout is designed. To analyze the characteristics of the designed antenna, we used commerical simulation tool(HFSS). Triple and wide band characteristic could be realized the measured bandwidth(V.S.W.R<2.0) of the designed antenna operated in 1.71GHz${\sim}$1.99GHz. The size of the designed antenna is about 19mm${\times}$4mm${\times}$1.6mm, narrow bandwidth which is a defect of chip antenna is improved. And its experimental results were a good agreement with simulation performance.

Hybrid MIMO Antenna for the Mobile Handset (휴대 단말기용 하이브리드 MIMO 안테나)

  • Son, Taeho
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.12 no.3
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    • pp.78-86
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    • 2013
  • A hybrid MIMO(Multi Input Multi Output) antenna which is operating both a monopole and a IFA(Inverted F Antenna) is designed. It's applied Vlade(Vertical lade) technique to reduce antenna space, and a diagonally fed MIMO antenna is designed on the bare board for the data communication. Return losses due to variables of antenna length are simulated for the design. Antenna for the hexa-frequency band of LTE700, CDMA, GSM, DCS, PCS and WCDMA is designed and implemented. This antenna is satisfied 3:1 VSWR over the whole design band by the measurement of return loss. And average gains and efficiencies were -3.67 ~ -2.53dBi and 42.06 ~ 55.84% for LTE700/CDMA/GSM frequency band, -3.27 ~ -1.21dBi and 47.08 ~ 75.6% for DCS/PCS/WCDMA frequency band. The isolation between 2 antenna that is one of important factors for the MIMO system was measured good performance as -8.14 ~ -25.77dB over the whole service band.

A Study on the Small Loop Antenna with a Parasitic Loop Structure for Multiband Mobile Phone Application (기생 루프 구조를 이용한 휴대 단말기용 다중 대역 초소형 루프 안테나에 관한 연구)

  • Lee, Sang-Heun;Kim, Ki-Joon;Jung, Jong-Ho;Yoon, Young-Joong;Kim, Byoung-Nam
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.6
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    • pp.706-713
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    • 2010
  • In this paper, the small loop antenna with a parasitic loop structure for penta-band mobile phone application is proposed. This antenna is composed of a feed monopole, a radiating loop antenna with a parasitic loop structure and an additional radiating element. The antenna is printed on the very thin flexible substrate to mount on the dielectric carrier with a volume of 40 mm$\times$11 mm$\times$3 mm. The bandwidth of the proposed antenna is 402 MHz(773~1,175 MHz) for low band and 583 MHz(1,622~2,205 MHz) for high band. As a result, the proposed antenna covers the five bands of GSM850, GSM900, DCS1800, PCS1,900 and WCDMA for a 3:1 VSWR. Moreover, the radiation pattern, gain and efficiency are appropriate for mobile handset. Therefore, this antenna is suitable for small sized multi-band mobile handset applications.