• Title, Summary, Keyword: RF Transmission

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

  • Park, Chang-Hyun;Choi, Byung-Ha;Shin, Dong-Ryul;Seong, Won-Mo
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.45 no.11
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    • pp.55-60
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    • 2008
  • This paper proposed a dual-band RF switch using a Composite Right/Left Handed transmission line(CRLH TL) and PIN diode. RF switch is usually consist of $\lambda/4$ Right Handed transmission line(RH TL) and PIN diode. The dual band characteristics of RF switch was achieved by using CRLH transmission line instead of RH transmission line. CRLH Open-Stub was designed for resolve to reduction of isolation due to Package Inductance of PIN diode. The proposed RF switch was designed at GSM and DCS frequency-band. The measurement results showed a good agreement with theoretical result.

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

  • 박성욱;황수철;박종욱
    • Journal of Internet Computing and Services
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    • v.3 no.1
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    • pp.1-10
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    • 2002
  • A remote image transmission apparatus combines robot technology and image transmission there is safe problem or place that a person can not go. Recently, control apparatus that use wire and RF between web server and robot for remote control are developed. But, there is problem that must install Internet line and communication distance. Transmission distance problem can solve when using the equipment of RF, but price of RF router is problem that is very high cost. In this paper, we developed remote control system using the cellular phone communication network that can control image transmission and image transmission apparatus to solve these problem. Developed system could solve defects of methods that use existent RF and internet. And could transmit the most suitable image and voice under limited condition include current communication network.

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

  • 박성욱;황수철;박종욱
    • Journal of the Korea Industrial Information Systems Research
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    • v.7 no.3
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    • pp.54-61
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    • 2002
  • A remote image transmission apparatus combines robot technology and image transmission there is safe problem or place that a person can not go. Recently, control apparatus that use wire and RF between web server and robot for remote control are developed. But there is problem that must install internet line and communication distance. Transmission distance problem call solve when using the equipment of RF, but price of RF router is problem that is very high cost. In this paper, we developed remote control system using the CDMA cellular phone communication network that can control image transmission and image transmission apparatus to solve these problem. Developed system could solve defects of methods that use existent RF and internet. And could transmit the most suitable image and voice under limited condition include current communication network.

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

  • Lee, Seong Hun;Son, Myung Sik
    • Journal of the Semiconductor & Display Technology
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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.

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

  • Hwang, Kyu-Sung
    • Journal of Korea Multimedia Society
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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.

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

  • Choi, Ki-Ju;Hwang, Hee-Yong
    • Journal of Industrial Technology
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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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Design and Fabrication of RF-DC Converters for 5.8 GHz Microwave Wireless Power Transmission (5.8 GHz 마이크로파 무선전력전송을 위한 RF-DC 변환기의 설계 및 구현)

  • Lee, Seong Hun;Son, Myung Sik
    • Journal of the Semiconductor & Display Technology
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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.

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

  • Yim Sang-Wook;Kim Yong-Sang;Kim Yang-Mo
    • Proceedings of the KIEE Conference
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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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Design and Fabrication of a BPF for 5.8 GHz Microwave Wireless Power Transmission (5.8 GHz 마이크로파 무선전력전송을 위한 BPF의 설계 및 구현)

  • Lee, Seong Hun;Son, Myung Sik
    • Journal of the Semiconductor & Display Technology
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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.