• Title/Summary/Keyword: RF Module

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Design of RF Power Detector Module with Switch for W-CDMA Optic Repeater (스위치를 이용한 W-CDMA 광중계기용 RF 전력 검출기 모듈의 설계)

  • Lee, Yun-Bok;Cho, Jung-Yong;Shin, Kyung-Sub;Lee, Yong-An;Lee, Hong-Min
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.389-393
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    • 2003
  • This paper describes the design of enhanced TSSI RF Power Detector which has wide dynamic range using switch and Log amp. This Power Detector consists of low and high gain loops, and they adaptively switched by output DC voltage which is proportioned to input power level. Because Power Detector needs to separate the channel, so architecture is heterodyne system having 70MHz intermediate frequency. This proposed RF Power Detector is settle to the satisfaction of Closed loop power control system for W-CDMA optic repeater, and the obtained dynamic range cover the higher than 50dB.

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A RF-ID System for Movement Data Collection under Drive (주행 중인 차량 운행 data 수집을 위한 RF-ID System)

  • Kim, Yong-Sang;Kim, Sang-Wook;Kim, Yang-Mo
    • Proceedings of the KIEE Conference
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    • 2004.04a
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    • pp.217-219
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    • 2004
  • In recent years, the smart card is wifely applied for wireless communication, tracking, transportation logistics, diagnostic monitoring, access control and security. RF-ID system is universally applicable. Passive RF-ID system consists from reader and passive tag. The reader transmits energy and simple information to a tag by wireless and the power from the reader is transformed for controller, FRAM and Bluetooth module. in this paper, an analysis and design of smart card for the transmission of the car movement data is presented.

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RE circuit simulation for high-power LDMOS modules

  • fujioka, Tooru;Matsunaga, Yoshikuni;Morikawa, Masatoshi;Yoshida, Isao
    • Proceedings of the IEEK Conference
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    • 2000.07b
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    • pp.1119-1122
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    • 2000
  • This paper describes on RF circuit simulation technique, especially on a RF modeling and a model extraction of a LDMOS(Lateral Diffused MOS) that has gate-width (Wg) dependence. Small-signal model parameters of the LDMOSs with various gate-widths extracted from S-parameter data are applied to make the relation between the RF performances and gate-width. It is proved that a source inductance (Ls) was not applicable to scaling rules. These extracted small-signal model parameters are also utilized to remove extrinsic elements in an extraction of a large-signal model (using HP Root MOSFET Model). Therefore, we can omit an additional measurement to extract extrinsic elements. When the large-signal model with Ls having the above gate-width dependence is applied to a high-power LDMOS module, the simulated performances (Output power, etc.) are in a good agreement with experimental results. It is proved that our extracted model and RF circuit simulation have a good accuracy.

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A Study on the Extraction of High frequency Characteristics of monoblock in 3D Ceramic Module using LTCC Process (LTCC를 이용한 3차원 세라믹 모듈 내 monoblock의 고주파 특성 추출에 관한 연구)

  • 김경철;유찬세;박종철;이우성
    • Proceedings of the International Microelectronics And Packaging Society Conference
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    • 2002.11a
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    • pp.165-168
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    • 2002
  • Accurate circuit simulation models for embedded RF passive components in LTCC provide a way to efficiently design high performance RF modules. Particularly, consideration of unavoidable parasitic components is required certainly. In this study, the parasitic components which is appeared from 3-D structure is considered.

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A Study on the Wireless Power Transmission according to the Antenna for RF-ID System (RF-ID 시스템에서 안테나에 따른 무선전력전송에 관한 연구)

  • Kim Yong-Sang;Yim Sang-Wook;Kim Yang-Mo
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1445-1447
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    • 2004
  • In recent years, the smart card is widely applied for wireless communication, tracking, transportation logistics, diagnostic monitoring, access control and security. RF-ID system is universally applicable. Passive RF-ID system consists of reader and passive tag. The reader transmits energy and simple information to a tag by wireless and the power from the reader is transformed for controller, FRAM and Bluetooth module. In this paper, proposed for the improvement of wireless power transmission and demonstrated the propriety through experiments in several conditions.

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Design and Implementation of DGPS Interface Module using CDMA Communication Network (CDMA 통신망을 이용한 DGPS 인터페이스 모듈의 설계 및 구현)

  • Kim Chang-Soo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.5
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    • pp.921-927
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    • 2006
  • The current DGPS technique is many problems that is permission of radio station using RF Wireless Modem, that is influence of geographic obstacle using radio wave, that is frequency interference, that is finiteness of frequency resources. In this paper, we are solved many elements, IM(Interface Module) replaces RF Wireless Modem, we suggest transmission technique of correction message using mobile phone, we researched Interface Module development which is linkage of DGPS receiver and mobile phone. IM can transmit correction message passing RS-232 port and modem communication control. IM of base station is initialized RS-232 port and modem to move station for correction message transmission, IM waited response mode. IM of move station is initialized RS-232 port and modem, IM requests hand shaking to base station, completed connection establishment. Users are worked Differential surveying using receiving correction message between mobile phones.

A Design of Sensor Web service Framework for Wireless Sensor Networks Environment (무선 센서 네트워크 환경에 대한 센서 웹 서비스 프레임워크의 설계)

  • Kim, Yong-Tae;Jeong, Yoon-Su;Park, Byung-Joo;Park, Gil-Cheol
    • Journal of the Korea Society of Computer and Information
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    • v.14 no.10
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    • pp.123-131
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    • 2009
  • In this paper, we design ZigBee RF based framework for mobile web service on collected data by sensor node and transmitting data to data base by sensor network and remote sensing server through wireless connection. The proposed system is an integrated platform of sensor network for the sensor management and providing SOA based sensor web access. This paper combines SOA technology with sensor network. composes sensor node as web view, and provides high capability. extensiveness, reliability, and usability to the user who accesses to sensor web. The mobile message conversion module, SOAP message processing module. WSDL message generator, and mobile web service module is embodied for improving the capacity of the framework. The capacity evaluation of local wireless communication system which is proposed in this paper is analyzed through NS-2 simulation.

Development of Efficient System for Reserved Seat Control (지정석관리를 위한 효율적 시스템 개발)

  • Oh, Hyun-Sik;Hyun, Jeong-Min;Jeong, Jin-Seung;Lee, Hak-In;Soh, Gyu-Young;Soh, Dea-Wha
    • Journal of the Speleological Society of Korea
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    • no.77
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    • pp.53-58
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    • 2007
  • From the computer or the library the use of the place about lower the case which gives a damage to the different person occurs with four three anger backs. It became from the hazard which manages the library place efficiently it used the AVR and a RF communication to make a system.

Local Oscillator Leakage Rejection For Satellite Communication Intermediate Frequency Module (위성통신 중간주파수 모듈용 국부발진기 누설제거에 관한 연구)

  • 서철헌;김영완;김내수;강민수
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.26 no.4B
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    • pp.400-405
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    • 2001
  • 본 논문에서는 Local Oscillator(LO)의 누설신호 제거를 위해 혼합기의 특성을 이용하여 광대역의 특성을 가지고 RF 채널에 근접한 누설신호를 제거할수 있는 구조를 제안하였다. 제안된 구조는 Half-LO 주파수를 이용하는 방버븡로 LO 누설신호를 일반적인 다른 경우보다 RF 신호대역에서 멀리 떨어진 대역으로 분리시킴으로서 대역 통과여파기로서 쉽게 제거하였다. 상향변환기로서 필요한 저역통과여파기, 대역통과여파기, 그리고 증폭기를 설계하였고 혼합기에 의한 영상성분은 혼합기의 위상을 특성을 이용하여 제거하였다.

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Development of LF/RF Smart Key Entry System for passanger vehicle (LF/RF를 이용한 승용 스마트 키 시스템 개발)

  • Shin, Sang-Ho;Ko, Kuk-Won;Lee, Se-Won
    • Proceedings of the KAIS Fall Conference
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    • 2011.05a
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    • pp.101-104
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    • 2011
  • 본 논문에서는 FOB Key Smart Key System module 간의 원할한 통신을 위한 실차 테스트를 하였으며, 실차 테스트를 위한 데모 모듈레이션 구성은 물론 각 모듈간의 통신상태및 최적의 통신 상태를 위한 3차원 그리드 형태의 실험준비를 하였고 최적의 감도를 얻기위한 수천번의 실차 테스트를 실시하였다.

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