• Title, Summary, Keyword: PCS 단말기

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Dualband Internal Antenna for GPS/PCS Handset (GPS/PCS 단말기용 듀얼밴드 내장형 안테나)

  • 정병운;이학용;이종철;김종헌;김남영;이병제;박면주
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.6
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    • pp.550-557
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    • 2003
  • In this paper, two dualband internal antennas for GPS/PCS handset are proposed. At first, the monopole antenna with parasitic dipole element is designed to print PCB of handset directly. At second, the antenna with bended loop structure is designed to bend to use internal space of handset maximumly. The proposed dualband internal antennas provide a 2:1 VSWR bandwidth of over 19.1 % which are possible to cover two bands at once. the antennas have a gain between -0.4 and 3.33 ㏈i at all bands and they have almost omni-directional patterns.

A Study on Introduction Plan for Power Limit of National Mobile Communication Handsets (국내 이동통신 단말기의 출력기준 도입방안에 관한 연구)

  • Kim, Jong-Heon;Noh, Sung-Gi;Lee, Young-Hwan
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.9 no.6
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    • pp.120-128
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    • 2010
  • In this paper, equivalent isotropic radiated power (EIRP) of six mobile phones made by two national companies were measured in order to introduce power limit of mobile phones for national CDMA, PCS and WCDMA applications. The measurement has been conducted in a full anechoic chamber and used antenna substitution method. From the measured results, the measured power of the mobile phones are compared by power limit regulations of mobile phones for USA, Japan and Europe. Finally, we propose power limits of 2 W ERP for CDMA phones, 2 W EIRP for PCS phones, and 2 W EIRP for WCDMA phones, respectively.

A sudy on the Out-of-band Noise Power for PCS Unified Repeater (PCS 통합중계기의 대역외 잡음에 관한 연구)

  • 황선호;김훈석
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.359-362
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    • 2002
  • The increase in the number of PCS base station and repeater has increased the level of interference between PCS carriers. In this paper, interference of singular PCS repeater out-of-band noise power on mobile phone is analysed and compared with that of unified PCS repeater for multiple PCS carriers. It is shown that unified PCS repeater provide about 2∼3dB signal gain in comparison with conventional PCS repeater. As a result, the interference of out-of-band noise power on mobile phone is reduced. It is expected that PCS carriers are able to build an environmentally-friendly communications infrastructure and reduce the cost by using unified PCS revealer and apply it for the deployment of IMT-2000 network.

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A method for efficient window management in PCS (PCS 정보단말기에서 효과적인 윈도우 관리를 위한 방법)

  • 최희석;염근혁
    • Proceedings of the Korean Information Science Society Conference
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    • pp.697-699
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    • 1999
  • GUI 환경에서 작업에 필요한 여러 윈도우를 작은 화면에 동시에 나타내기 위하여 많은 윈도우 시스템이 오버래핑 윈도우 관리 전략을 채택하고 있다. 하지만 개별 윈도우를 독립적으로 다룸으로써 작업전환시 개별 윈도우 단위의 정렬을 하여야 하는 등의 불필요한 작업을 수행하게 된다. 특히 본 연구의 목표 기종인 PCS 정보단말기는 320*240 크기의 소형 디스플레이 장치를 가지고 있기 때문에, 가시적인 작업 단위의 윈도우 그룹에 대한 빈번한 변경을 다루는데 부적합하다. 따라서 본 논문에서는 작업 단위로 윈도우를 그룹화하는 방식으로 윈도우를 관리함으로써 보다 효율적으로 작업 전환을 수행하는 방법을 제안하고, 성능 평가를 통하여 제시된 방법의 효율성을 보여준다.

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Radiation Pattern and Radio Sensitivity of PCS Band Mobile Phones with Internal Antenna and External Antenna (PCS 대역 안테나 내장형 단말기와 외장형 단말기의 방사패턴과 무선감도)

  • 공성신;오종대;양운근
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.4
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    • pp.397-405
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    • 2004
  • In this paper, performance analysis of mobile phone with internal antenna for PCS band was carried out. The radiation patterns for antenna and mobile phone with internal antenna were simulated by using 3D simulation program, HFSS and SEMCAD. Radiation pattern variation was observed according to installation of LED circuit and ground pattern and by using simulation radiation pattern was improved. And radiation patterns of mobile phones with internal and external antennas were measured by using for field measurement system and chamber. Measured radiation pattern for mobile phone with internal antenna shows good agreement with simulation result. And the radio sensitivities of mobile phones with internal and external antennas were measured by using Agilent E5515C and chamber and compared. The measured radio sensitivity of mobile phone with internal antenna shows proper performances comparable to other model with external antenna. Measured result shows that the difference on averaged co-polar radio sensitivity is 0.12 ㏈.

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

  • Kim, Hyoun-Kyoung;park, Ju-Derk;Kim, Jin-Suk;Kim, Nam
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.306-310
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    • 2000
  • 본 논문에서는 안테나 구조해 따른 PCS 전화기에 의해 인체두부에 유기되는 SAR 값을 비교 분석하였고, SAR 값에 영향들 주는 요인을 분석하였다. 안테나의 종류, 안테나의 부착위치, 단말기의 구조에 따른 1 g 및 10 g 평균 첨두 SAR 값을 계산하였고, 인체 두부의 깊이에 따른 SAR 분포의 변화를 살펴보았다. 플립형 단말기에 부착된 안테나 중에서는 side mounted PIFA(Planar Inverted F Antenna)의 1 g 및 10 g 평균 첨두 SAR 값이 각각 0.686 W/kg과 0.353 W/kg으로 가장 낮았다. 폴더형 단말기에 부착된 모노폴 안테나에 의한 1 g 및 10 g 평균 첨두 SAR값은 플립형에 의한 SAR 값에 비해 약 30 % 가량 낮은 것으로 나타났다. 평균 첨두 SAR 값이 낮은 값을 보이는 두 구조인 side mounted PIFA와 폴더형 구조의 모노폴 안테나의 깊이에 따른 SAR 분포는 나머지 두 구조에 비해 비교적 완만한 경사를 보였다.

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Development of a Linear Power Amplifier Module for PCS Handy Phone (휴대용 PCS 단말기를 위한 선형 전력증폭기 모듈의 구현)

  • 노태문;한기천;김영식;박위상;김범만
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.8 no.6
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    • pp.558-567
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    • 1997
  • Linear power amplifier modules with high-efficiency have been developed for PCS handy phone. These modules were designed using extracted large-signal models of MESFETs and harmonic balance simulation. The modules are intended for low-tier and high-tier at the operation frequency range of 1750 ~ 1780 MHz. For low-tier module, the output power and $IMD_3$ were 23.2 dBm and 31 dBc, respectively, at power-added efficiency of 34% with the supply drain bias of 3.6 V. For high-tier module, the output power and $IMD_3$ were 272.2 dBm and 31 dBc, respectively, at power-added efficiency of 33% with the supply drain bias of 4.2 V. These linear power amplifier modules are suitable for PCS handy phone.

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Design of 3-Fingers Type Internal Antenna for GPS/PCS Handsets (GPS/PCS 단말기용 3-Finger형 내장형 안테나 설계)

  • Bang Sang-Won;Jung Byung-Woon;Lee Hak-Yong;Park Myun-Joo;Lee Byungje
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.1
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    • pp.1-8
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    • 2005
  • This paper proposes a new type of a dual-band internal antenna for GPS/PCS handsets. The antenna has three monopoles in different lengths, and this structure is referred as a 3-fingers type antenna in this paper. The antenna with low-profile structure is designed to use internal space of handset maximally. The fabrication and the measurement are accomplished by attaching the 3-finger type antenna to the inside of a commercial handset. We obtain gain of 1.97 dBi$\~$0.66 dBi in the GPS band, and -0.92 dBi$\~$1.02 dBi in the PCS band and almost omni-directional patterns at all bands.