• Title/Summary/Keyword: matching circuit

Search Result 469, Processing Time 0.038 seconds

Broadband Impedance Matching Circuit Design for PLC Coupler Using Tchebycheff Equalizer

  • Kim, Gi-Rae;Tangyao, Xie
    • Journal of information and communication convergence engineering
    • /
    • v.7 no.2
    • /
    • pp.113-118
    • /
    • 2009
  • This paper is about design broadband impedance matching circuit for Coupler to improve power transfer efficiency in the power line communication (PLC) system. The Tchebycheff gain function algorithm is represented to design broadband matching circuit. A practical PLC Coupler impedance matching circuit is designed, and the characteristics for S11 and S21 of PLC coupler are enhanced comparing with unmatched one. This is done by maximizing the power transfer gain from modem to the load.

Design of Broadband Impedance Matching Circuit for PLC Coupler using Butterworth Equalizer

  • Xie, Tangyao;Kim, Gi-Rae
    • Journal of information and communication convergence engineering
    • /
    • v.8 no.3
    • /
    • pp.258-262
    • /
    • 2010
  • This paper represents design broadband impedance matching circuit for Coupler to improve power transfer efficiency in the broadband power line communication(BPLC) systems. The Butterworth gain function equalizer is used to design broadband matching circuit. A practical PLC Coupler impedance matching circuit is designed, and the characteristics for S11 and S21 of PLC Coupler are enhanced comparing with unmatched one. This is done by maximizing the power transfer gain from modem to the load.

Estimation of Equivalent Circuit Parameters of Underwater Acoustic Piezoelectric Transducer for Matching Network Design of Sonar Transmitter (소나 송신기의 정합회로 설계를 위한 수중 음향 압전 트랜스듀서의 등가회로 파라미터 추정)

  • Lee, Jeong-Min;Lee, Byung-Hwa;Baek, Kwang-Ryul
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.12 no.3
    • /
    • pp.282-289
    • /
    • 2009
  • This paper presents an estimation technique of the equivalent circuit parameters for an underwater acoustic piezoelectric transducer from the measured impedance. Estimated equivalent circuit can be used for the design of the impedance matching network of the sonar transmitter. A fitness function is proposed to minimize the error between the calculated impedance of the equivalent circuit and the measured impedance of the transducer. The equivalent circuit parameters are estimated by using the fitness function and the PSO(Particle Swarm Optimization) algorithm. The effectiveness of the proposed method is verified by the applications to a sandwich-type transducer and a dummy load. In addition, the impedance matching network is also designed by using the estimated equivalent circuit model.

Non-Foster Matching Circuit Design to Improve VHF- and UHF-Band Small Antenna Impedance Matching (VHF 및 UHF 대역 소형 안테나 매칭성능 개선을 위한 비 포스터 정합회로 설계)

  • Go, Jong-Gyu;Chung, Jae-Young
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.29 no.3
    • /
    • pp.159-166
    • /
    • 2018
  • Herein, a non-Foster matching circuit is designed to improve the impedance matching characteristics of small antennas in the VHF and UHF bands. The proposed non-Foster circuit is designed to operate with negative capacitance in a wide frequency band from 50 MHz to 1,000 MHz for use in various communication bands. To ensure the stability of the non-Foster circuit with conditional stability, the open-circuit stability condition of Linvill was satisfied, and the circuit was fabricated using the FR-4 substrate. The fabricated non-Foster circuit was combined with a small antenna to verify its performance by measuring the return loss and received power in the FM, DMB, and GSM bands. The measured return loss was improved from -6 dB to -30 dB, and the measured received power was improved from 0.5 dBm to 5.2 dBm.

Non-Foster Matching Circuit for Wideband Anti-Jamming Small GPS Antennas (광대역 항재밍 소형 GPS 안테나용 비 포스터 정합회로)

  • Ha, Sang-Gyu;Jung, Kyung-Young
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.27 no.12
    • /
    • pp.1112-1115
    • /
    • 2016
  • Global Positioning System(GPS) is a useful system used in both civilian and military applications. However, the signal of GPS is susceptible to jamming attacks due to low receive sensitivity, since the signals come from the satellite located at over 20,000 km above the earth. In this paper, we have conducted a preceding research on a non-Foster matching circuit that efficiently matches an electrically ultra-small GPS antenna. Electrically Small Antennas(ESAs) are inefficient radiators and are difficult to match in wideband due to extremely high quality factor. In order to match small GPS antenna in wideband, a non-Foster matching circuit for a small GPS antenna was designed. A negative impedance converter circuit consisting of Linvill's cross-coupled pair transistors was fabricated and its stability was verified by the time-domain stability analysis. In addition, anechoic chamber measurements show that the non-Foster matching circuit for small GPS antenna can lead bore-sight gain improvement by more than 17 dB.

Dual-Band MIMO Antenna Using a Band Stop Matching Circuit for USB Dongle Applications (대역 저지 특성을 갖는 정합 회로를 이용한 USB Dongle용 이중 대역 MIMO 안테나)

  • Han, Min-Seok;Choi, Jae-Hoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.20 no.9
    • /
    • pp.924-929
    • /
    • 2009
  • In this paper, a dual-band MIMO antenna with a band stop matching circuit for next generation USB dongle application is proposed. The proposed multiband MIMO antenna consists of two dual-band PIFAs which provide wideband characteristics. In order to improve the isolation characteristic at the LTE(Long Term Evolution) band, a band stop matching circuit was inserted at the corner of each antenna element. The inserted band stop matching circuit is to suppress the surface current at the specific frequency band and to generate two additional resonances around 770 MHz for LTE band and near 830 MHz for digital communications network(DCN) service. The proposed MIMO antenna can cover LTE and DCN services, simultaneously.

A Study of Impedance Matching Circuit Design for PLC

  • Kim, Gi-Rae
    • Journal of information and communication convergence engineering
    • /
    • v.7 no.4
    • /
    • pp.453-458
    • /
    • 2009
  • This paper presents two methods of designing a Broadband Impedance Matching (BIM) circuit for maximizing a power line communication (PLC) equipment (or Modem) signal injection into its load at any power line connection port. This optimal (BIM) circuit design is achieved in two phases: Butterworth gain function and Tchebycheff gain function. According to the comparison of simulation and practical results, the performances of two gain functions on BIM are discussed.

An equivalent Circuit Model of Transformer Coupled Plasma Source (축전 용량이 고려된 평판형 유도 결합 플라즈마 원의 등가회로 모델)

  • Kim, Jeong-Mi;Kwon, D.C.;Yoon, N.S.
    • Proceedings of the KIEE Conference
    • /
    • 2002.07c
    • /
    • pp.1760-1762
    • /
    • 2002
  • In this work we develop an equivalent circuit model of TCP(transformer coupled plasma) source and investigate matching characteristic. The developed circuit model includes transmission line, standard-type impedance matching network and displacement current in the plasma source. The impedance of TCP is calculated by previously developed program for various source parameters and dependance of components of matching impedance on the value of source impedance is investigated.

  • PDF

A Boolean Circuit For Finding Maximum Matching In A Convex Bipartite Graph. (볼록 이분할 그래프에서 최대 매칭을 찾기 위한 불리안 회로)

  • Lee, Sunghee;Yoojin Chung
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2004.04a
    • /
    • pp.952-954
    • /
    • 2004
  • We've developed a Boolean circuit that finds a maximum matching in a convex bipartite graph. This circuit is designed in BC language that was created by K. Park and H. Park(1). The depth of the circuit is O(log$^2$nㆍlog b) and the size is O(bn$^3$). Our circuit gets a triple representation of a convex bipartite graph as its input and produces the maximum matching for its output. We developed some Boolean circuit design techniques that can be used for building other Boolean circuits.

  • PDF

Signal-to-noise Ratio Improvement of a FM Antenna Using a Non-Foster Circuit (Non-Foster 회로를 이용한 FM 안테나의 신호 대 잡음비 개선)

  • Park, Hongwoo;Kahng, Sungtek;Kim, Hongjoon
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.65 no.2
    • /
    • pp.329-334
    • /
    • 2016
  • In this paper, we demonstrate a Non-Foster matching method for an electrically small antenna to improve the signal-to-noise ratio (SNR) of communication link. For the experiment, we used a general FM antenna whose resonance frequency is about 52-57 MHz and a floating type Linvill negative impedance converter(NIC)-based circuit as a Non-Foster matching element. By implementing the Non-Foster circuit to cover FM band, we can achieve a wide bandwidth matching covers 40-200 MHz. Our measurement shows 3-7 dB improvement of SNR for the same bandwidth though there are several spikes which means no improvement of SNR in the band.