• Title, Summary, Keyword: RF Transmission

Search Result 637, Processing Time 0.03 seconds

Implementation of an RF Module for 2.4GHz Wireless Audio/Video Transmission (2.4GHz 무선 음성/영상 송신용 RF 모듈 구현)

  • 김거성;권덕기;박종태;유종근
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.55-58
    • /
    • 2002
  • This paper describes an RF module for 2.4GHz wireless audio/video transmission. The pre-processed baseband input signals are FM-modulated using a VCO and then transmitted through an antenna after RF filtering. The designed circuits are implemented using a Teflon board of which the size is 52mm${\times}$62mm. The measured maximum output signal levels are around -3dBm and the harmonics are less than -450dBc. The manufactured module consumes 130mA from a 8V supply.

  • PDF

Fabrication and measurement of RH/LH mode-switchable CRLH transmission line based on silicon RF MEMS switches (실리콘 RF MEMS 스위치 기반의 RH/LH 모드 스위칭이 가능한 CRLH 전송선 제작 및 측정)

  • Hwang, Sung-Hyun;Jang, Tae-Hee;Bang, Yong-Seung;Kim, Jong-Man;Kim, Yong-Kweon;Lim, Sung-Joon;Baek, Chang-Wook
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1507_1508
    • /
    • 2009
  • This study proposes a composite right/left-handed transmission line (CRLH-TL) that permits switching between the right-handed (RH) and left-handed (LH) modes using single crystalline silicon (SCS) RF MEMS switches. It is possible to change modes from the RH to LH mode, or vice versa, by controlling the admittance of capacitors and the impedance of inductors using switch operations. The proposed switchable CRLH-TL consists of SCS RF MEMS switches, metal-insulator-metal (MIM) capacitors and shunt inductors. At 8 GHz, the fabricated device shows a phase response of $87^{\circ}$ with an insertion loss of 2.7 dB in the LH mode, and a phase response of $-77^{\circ}$ with an insertion loss of 0.56 dB in the RH mode.

  • PDF

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
    • /
    • /
    • pp.1445-1447
    • /
    • 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.

  • PDF

Wireless Sensors Module for Remote Room Environment Monitoring

  • Lee, Dae-Seok;Chung, Wan-Young
    • 제어로봇시스템학회:학술대회논문집
    • /
    • /
    • pp.449-452
    • /
    • 2005
  • For home networking system with a function of air quality monitoring, a wireless sensor module with several air quality monitoring sensors was developed for indoor environment monitoring system in home networking. The module has various enlargements for various kinds of sensors such as humidity sensor, temperature sensor, CO2 sensor, flying dust sensor, and etc. The developed wireless module is very convenient to be installed on the wall of a room or office, and the sensors in the module can be easily replaced due to well designed module structure and RF connection method. To reduce the system cost, only one RF transmission block was used for sensors' signal transmission to 8051 microcontroller board in time sharing method. In this home networking system, various indoor environmental parameters could be monitored in real time from RF wireless sensor module. Indoor vision was transferred to client PC or PDA from surveillance camera installed indoor or desired site. Web server using Oracle DB was used for saving the visions by web-camera and various data from wireless sensor module.

  • PDF

Analysis of RF Energy Transmission Technology to Realize Industry. (RF 에너지 전송기술 산업화를 위한 분석)

  • Yun, J.H.;Byun, W.J.;Choi, J.I.;Lee, H.J.
    • Electronics and Telecommunications Trends
    • /
    • v.26 no.4
    • /
    • pp.79-89
    • /
    • 2011
  • 본 문서에서는 RF 에너지 전송기술의 동향을 살펴보고, 분석된 내용을 바탕으로 국가적인 차원에서 RF 에너지 전송기술을 어떠한 방향으로 이끌어 가야 하는지에 대해 기술하고자 한다. 국가가 반드시 수행해야 할 기반원천기술, 산업적 특성에 따른 신시장 혹은 신기술 구현을 위한 실용원천기술 개발분야를 살펴볼 것이다. 또한 기존 자기공명방식에 대한 한계를 분석하여 한계를 극복하기 위한 핵심원천기술을 서술하였다. 마지막으로 RF 에너지 전송산업이 국내에 잘 정착하기 위한 선도전파정책을 구현하기 위한 연구분야에 대하여 살펴보고자 한다.

  • PDF

A Study on RF Characteristics of Transmission Line Employing Inverted Periodically Arrayed Capacitive Devices for Application to Highly Miniaturized Wireless Communication system on MMIC (MMIC 상에서 초소형 무선 통신 시스템에의 응용을 위한 반전된 형태의 주기적 용량성 구조를 이용한 전송선로의 RF 특성에 관한 연구)

  • Kim, Jeong-Hoon;Jang, Jang-Hyeon;Yun, Young
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.39 no.1
    • /
    • pp.52-57
    • /
    • 2015
  • In this paper, we studies on the RF characteristics of the transmission line employing IPACD (inverted periodically arrayed capacitive devices) on MMIC (monolithic microwave integrated circuit) for application to wireless communication system. According to measured results, the novel transmission line employing IPACD showed a wavelength much shorter than conventional transmission lines. In addition, the IPACD structure showed an effective permittivity much higher than conventional ones. We also extracted the bandwidth characteristic of the IPACD structure using equivalent circuit analysis. According to the results, the cut-off frequency of the proposed structure was 129.2 GHz.

Monolithically Integrable RF MEMS Passives

  • Park, Eun-Chul;Park, Yun-Seok;Yoon, Jun-Bo;Euisik Yoon
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • v.2 no.1
    • /
    • pp.49-55
    • /
    • 2002
  • This paper presents high performance MEMS passives using fully CMOS compatible, monolithically integrable 3-D RF MEMS processes for RF and microwave applications. The 3-D RF MEMS technology has been developed and investigated as a viable technological option, which can break the limit of the conventional IC technology. We have demonstrated the versatility of the technology by fabricating various 3-D thick-metal microstructures for RF and microwave applications, such as spiral/solenoid inductors, transformers, and transmission lines, with a vertical dimension of up to $100{\;}\mu\textrm{m}$. To the best of our knowledge, we report that we are the first to construct a fully integrated VCO with MEMS inductors, which has achieved a low phase noise of -124 dBc/Hz at 300 kHz offset from a center frequency of 1 GHz.

Development of Real Time Data Acquisition Unit for a projectile Using RF (RF를 이용한 발사체를 위한 실시간 데이터 취득 장치 구현)

  • Hong, Il-Hee;Lee, Seung-Min;Kim, Yang-Mo
    • Journal of the Institute of Electronics Engineers of Korea SC
    • /
    • v.46 no.1
    • /
    • pp.49-54
    • /
    • 2009
  • This paper proposes a new approach to provide RF communication channel and electric power transmission to overcome the weakness of conventional tests, which may cause several problems. When an RF communication device is used to communicate between launch vehicle and launch complex in stead of using harness umbilical, it may draw the simplicity of ground test equipments, cost-saving, and the reduction of test time. In addition, if an RF power transmission device is adopted to supply on-board power of launch vehicle, it can replace expensive on-board batteries, which may be degraded easily by the repeated charging and discharging processes.

Design and Implementation of Multi-Channel WLL RF-module for Multimedia Transmission (멀티미디어 전송을 위한 무선가입자용 RF-모듈의 설계 및 제작)

  • Kim, Sang-Tae;Shin, Chull-Chai
    • Journal of IKEEE
    • /
    • v.3 no.2
    • /
    • pp.186-195
    • /
    • 1999
  • In this paper, the RF-modules composed of front-end, frequency synthesizer, modulator/demodulator and power control multi channel WLL personal system for W-CDMA using 10 [MHz] RF channel bandwidth has been implemented and considered. The measured transmission power is 250 [mW] which is very close to the required value. The measured flatness of power at the final output stage is ${\pm}1.5[dB]$ over the required bandwidth of the receiver. In addition, it is found that the chip rate transmitting spread signal is set to 8.192 [MHz], the required rate. The frequencies of RF_LO signal and LO signal of the modulator and the demodulator measured by a frequency synthesizer are satisfied with design requirements. The operating range of the receiving strength signal indicator and AGC units shows 60 [dB] respectively. Also the measured phasor diagram and eye pattern for deciding the RF modules compatible with baseband digital signal processing part are shown good results.

  • PDF

A Study on RF/PON Transmission System for CableTV Network Upgrade (케이블TV 네트워크 고도화를 위한 RF/PON 전송시스템에 관한 연구)

  • Ahn, Byoung-Jun;Park, Sung-Kwon
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.39B no.8
    • /
    • pp.510-517
    • /
    • 2014
  • Recently, Cable communications services are becoming the HDTV to 3DTV, UHDTV broadcasting and 100Mbps to 1Gbps Internet. however existing technologies are limited to provide high-quality broadband services in the HFC network. The network upgrade technologies have some problems that Up/Downsteam frequency extension, Cost of upgrading by using DOCSIS3.1, EPOC and Legacy STB compatibility, Cost of upgrading the network by RFoG, RF overlay PON. This paper propose the RF/PON based gigabit Transmission system in order to provide the 1Gbps internet without using frequency and the Multiscreen to IP devices. After the proposed RF/PON system was developed and implemented, this paper evaluate the performance of RF/PON system for simultaneously real-time braodcasting and 1Gbps internet, Multiscreen service, and so on.