• 제목, 요약, 키워드: RF Transmission

검색결과 637건 처리시간 0.042초

Composite Right/Left Handed 전송선과 PIN 다이오드를 이용한 이중대역 RF 스위치 연구 (Study of a Dual-band RF switch using a Composite Right/Left Handed Transmission Line and PIN Diode)

  • 박창현;최병하;신동률;성원모
    • 대한전자공학회논문지TC
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    • v.45 no.11
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    • pp.55-60
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    • 2008
  • 본 논문에서는 CRLH(Composite Righ/Left Handed) 전송선과 PIN 다이오드를 이용한 이중대역 RF 스위치를 제안하였다. 일반적인 RF 스위치가 RH(Right Handed) 전송선 및 PIN 다이오드로 구성되는 것과는 달리, 제안된 RF 스위치는 CRLH 전송선을 이용함으로써 이중대역 특성을 만족하였다. 설계된 CRLH전송선은 Open-Stub를 이용하여 PIN 다이오드 패키지 인덕턴스로 인한 격리도 감소를 해결하였다. RF 스위치는 GSM 주파수 대역인 900MHz와 DCS 주파수 대역인 1.8GHz의 이중 대역에서 설계 및 제작하였다.

셀룰러폰 통신망을 이용한 영상전송 및 전송제어 장치에 관한 연구 (A Study on the Apparatus for Image Transmission and Transmission Control using Cellular Phone Network)

  • 박성욱;황수철;박종욱
    • 인터넷정보학회논문지
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    • v.3 no.1
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    • pp.1-10
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    • 2002
  • 원격 영상전송 장치는 안전상의 문제가 있거나 사람이 갈 수 없는 곳을 관찰하기 위해 로봇 기술과 영상전송 기술을 결합한 것이다. 최근 원격 제어를 위해 웹서버와 로봇간 유선 및 RF를 이용한 제어 장치들이 개발되고 있지만, 작동 거리 및 인터넷 라인을 설치해야 하는 제한점이 있으며, 무선 방식의 통신장비를 이용할 경우 무선 라우터의 가격이 고가라는 문제가 있다. 본 연구에서는 이러한 문제점을 해결하기 위해 셀룰러 폰 통신망을 이용하여 영상전송 및 영상전송 장치를 원격으로 제어할 수 있는 시스템을 개발하였으며, 개발된 시스템은 기존의 무선통신(RF)을 이용한 영상 전송시의 단점인 거리 제한 문제와 인터넷을 이용한 영상전송시의 문제를 해결할 수 있었고, 현재의 통신망을 비롯한 제한된 조건 하에서 최적의 영상 및 음성을 전송할 수 있었다.

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CDMA 통신망을 이용한 원격 영상 전송 시스템의 설계 및 구현 (Design and Implementation of the Remote Image Transmission System using CDMA Communication Network)

  • 박성욱;황수철;박종욱
    • 한국산업정보학회논문지
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    • v.7 no.3
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    • pp.54-61
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    • 2002
  • 원격 영상전송 장치는 안전상의 문제가 있거나 사람이 갈 수 없는 곳을 관찰하기 위해 로봇 기술과 영상전송 기술을 결합한 것이다. 최근 원격 제어를 위해 웹서버와 로봇간 유선 및 RF를 이용한 제어 장치들이 개발되고 있지만, 작동 거리 및 인터넷 라인을 설치해야 하는 제한점이 있으며, 무선 방식의 통신장비를 이용할 경우 무선 라우터의 가격이 고가라는 문제가 있다. 본 연구에서는 이러한 문제점을 해결하기 위해 CDMA 셀룰러 폰 통신망을 이용하여 영상전송 및 영상전송 장치를 원격으로 제어할 수 있는 시스템을 개발하였으며, 개발된 시스템은 기존의 무선동신(RF)을 이용한 영상 전송시의 단점인 거리 제한 문제와 인터넷을 이용한 영상전송시의 문제를 해결할 수 있었고, 현재의 통신망을 비롯한 제한된 조건하에서 최적의 영상 및 음성을 전송할 수 있었다.

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5.8 GHz 마이크로파 무선전력전송 시스템 개발 및 전송효율측정 (5.8 GHz Microwave Wireless Power Transmission System Development and Transmission-Efficiency Measurement)

  • 이성훈;손명식
    • 반도체디스플레이기술학회지
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    • v.13 no.4
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    • pp.59-63
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    • 2014
  • Previous studies have selected wireless power transmission system using 2.45 GHz of ISM band, but the researches for 5.8 GHz microwave wireless power transmission have been relatively rare. The 5.8 GHz has some advantages compared with 2.45 GHz. Those are smaller antenna and smaller integrated system for RFIC. In this paper, the 5.8 GHz wireless power transmission system was developed and transmission efficiency was measured according to the distance. A transmitter sent the amplified microwaves through an antenna amplified by a power amplifier of 1W for 5.8 GHz, and a receiver was converted to DC from RF through a RF-DC Converter. In the 1W 5.8GHz wireless power transmission system, the converted currents and voltages were measured to evaluate transmission efficiency at each distance where LED lights up to 1m. The RF-DC Converter is designed and fabricated by impedance matching using full-wave rectifier circuit. The transmission-efficiency of the system shows from 1.05% at 0cm to 0.095% at 100cm by distance.

Switch-and-Stay Combining 기반 Mixed RF/FSO Dual-hop 전송 시스템 성능 분석 (Performance Analysis of Mixed RF/FSO Dual-hop Transmission with Switch-and-Stay Combining)

  • 황규성
    • 한국멀티미디어학회논문지
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    • v.21 no.4
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    • pp.493-498
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    • 2018
  • In this paper, we provide the performance analyses of a dual-hop amplify-and-forward(AF) relay transmission composed of asymmetric radio-frequence(RF) and free-space optical(FSO) links. In the mixed RF/FSO system, a relay is equipped with two receive antennas for RF signals and one additional transmit antenna for FSO signals. In order to improve a performance of RF link, a switch-and-stay (SSC) diversity technique is applied at the relay which can provide a proper link performance with a low complexity. Specifically, we offer the performance analyses of the proposed system in terms of outage probability and secrecy outage probability. In numerical examples, we compare the system performances with no diversity and selection combining systems and verify our analytical results via computer-based Monte-Carlo simulations.

무선전력전송을 위한 RF-DC 변환기 회로의 성능비교 (Performance comparison of the RF-DC converter circuit for wireless power transmission)

  • 최기주;황희용
    • 산업기술연구
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    • v.29 no.B
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    • pp.145-149
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    • 2009
  • A RF-DC converter is one of the most important components for a wireless power transmission. It has been developed for many applications such as space solar power system, and Radio Frequency Identification(RFID). In this paper, we designed three types of RF-DC converter and compare the performance of each. All types RF-DC convertoer have a maximum conversion efficiency at input power level of 0 dBm~5 dBm and RF-DC converter of third type was the best performance that has a 21.9% of conversion efficiency.

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5.8 GHz 마이크로파 무선전력전송을 위한 RF-DC 변환기의 설계 및 구현 (Design and Fabrication of RF-DC Converters for 5.8 GHz Microwave Wireless Power Transmission)

  • 이성훈;손명식
    • 반도체디스플레이기술학회지
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    • v.14 no.4
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    • pp.84-87
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    • 2015
  • We have designed and fabricated two different RF-DC Converters called doubler for 5.8GHz Microwave Wireless Power Transmission. The doubler as RF-DC Converter makes the rectified voltage be doubled. We measured and compared voltages of the doublers with those of the previous full-wave rectifying RF-DC Converter. The doublers show rectified double voltages. However, the full-wave rectifying converter has a high efficiency due to the suppression of reflecting harmonics. The other fabricated doublers causes so many harmonics that they can't convert the low-power RF to the full DC. In this paper, we show that the different doublers doesn't double the rectifying voltages compared with those of the full-wave rectifying converter and give a reason about that.

RF-ID에서 전력전송을 위한 전력증폭기와 송수신 Antenna 설계 (Design of Power Amplifier and Antenna for Power Transmission at RF-ID)

  • 임상욱;김용상;김양모
    • 대한전기학회:학술대회논문집
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    • pp.1263-1265
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    • 2004
  • RF-ID system is one of the very interesting field not only in a technical and economical point of view but also that people are still trying to realize lossless power transmission. This paper has a purpose on the efficient power transmission at the passive type IDcard by using wireless power transmission system. The most difficult but important part of the passive type RF-ID system is building the system that supplies power from Reader-antenna to IDcard-antenna. To check what is the most efficient way to deliver power depending on what kind of specifications of the power-amp in reader, antenna and antenna in IDcard is for operating IDcard circuit efficiently receiving the power from reader-antenna. For this, we used 125kHz sinewave for RF signal as a basic specification, OP-amp for amplifying signal and power-amp for amplifying power, loop type antenna.

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5.8 GHz 마이크로파 무선전력전송을 위한 BPF의 설계 및 구현 (Design and Fabrication of a BPF for 5.8 GHz Microwave Wireless Power Transmission)

  • 이성훈;손명식
    • 반도체디스플레이기술학회지
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    • v.14 no.4
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    • pp.88-91
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    • 2015
  • In this paper, we have designed and fabricated a BPF (Band Pass Filter) for 5.8GHz Microwave Wireless Power Transmission. We $used{\lambda}g/2$ open-circuited stubs in addition to T-shaped transmission lines for the BPF. This BPF removes harmonics caused by diodes of RF-DC converter, and thus the RF-DC converter converts more RF power to the DC. The performance of the BPF was measured and shown through direct comparison of voltages converted by the doubler as a RF-DC Converter with and without the BPF.

Joint Transmission Slot Assignment, FSO Links Allocation and Power Control for Hybrid RF/FSO Wireless Mesh Networks

  • Zhao, Yan;Shi, Wenxiao;Shi, Hanyang;Liu, Wei;Wu, Pengxia
    • Current Optics and Photonics
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    • v.1 no.4
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    • pp.325-335
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    • 2017
  • Hybrid radio frequency/free space optical (RF/FSO) wireless mesh networks have attracted increasing attention for they can overcome the limitations of RF and FSO communications and significantly increase the throughput of wireless mesh networks (WMNs). In this article, a resource assignment optimization scheme is proposed for hybrid RF/FSO wireless mesh networks. The optimization framework is proposed for the objective of maximizing throughput of overall hybrid networks through joint transmission slot assignment, FSO links allocation and power control with the consideration of the fading nature of RF and FSO links. The scheme is formulated as an instance of mixed integer linear program (MILP) and the optimal solutions are provided using CPLEX and Gurobi optimizers. How to choose the appropriate optimizer is discussed by comparing their performance. Numerous simulations are done to demonstrate that the performance of our optimization scheme is much better than the current case of having the same topology.