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Matching Network (matching + network)

Distribution by Scientific Domains
Engineering100%

Kinds of Matching Network

  • output matching network
    		•

    Selected Abstracts

    Frequency reconfigurable RF circuits using photoconducting switches

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 1 2010
    D. Draskovic
    Abstract Designs for a frequency switchable dual-band branch-line coupler and a reconfigurable S-band power amplifier input matching network with photoconducting switches are presented. Frequency switching is achieved by increasing the power of the laser applied to the highly resistive silicon wafer and changing the properties of silicon under optical illumination. The advantages of this approach are high-speed switching, electromagnetic transparency (no interference), and thermal and electrical isolation between the device and the control circuit. A branch-line coupler frequency shift of 35% and 10% has been achieved from all switches off to all switches on in lower (900 MHz) and upper (1800 MHz) frequency bands, respectively. Frequency switchable class AB power amplifier with silicon switch in the input matching circuit has obtained the frequency tuning range of 2.5,3.5 GHz with no significant loss in efficiency and linearity. © 2009 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010. [source]

    Optimization of output matching network for class F power amplifier according to envelope in the envelope elimination and restoration transmitter

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2010
    Chongmin Lee
    Abstract This article presents the design and optimization of output matching network according to envelope for class F power amplifier (PA), which is to apply to envelope elimination and restoration (EER) transmitter. In this article, to increase the PAE of class F PA, which applies to EER transmitter, the varactor diode has been used on output matching network. As envelope changes, it optimizes constitution of harmonic trap that is short circuit in second-harmonic and is open circuit in third-harmonic. When drain voltage changes from 25 V to 30 V, some percentage is improved in the PAE. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1890,1893, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25335 [source]

    Design of dual-band quadrifilar spiral antennas for satellite-mobile handsets

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2010
    R. A. Abd-Alhameed
    Abstract A novel quadrifilar spiral antenna is proposed for use in personal communications mobile terminals exploiting the "big low earth orbit" (big-LEO) satellite system (uplink 1.61,1.63 GHz; downlink 2.48,2.5 GHz). Feeding of the antenna from the outer periphery is proposed, to avoid the complexity and space requirements of a centre feed; an externally fed antenna can also be fed either by coaxial cables or stripline. Moreover, the hybrid phasing network and the matching network (if required) can be located outside and possibly printed in the same plane as the antenna structure. Versions of the design were investigated using the method of moments and in hardware realizations. These had a finite ground plane with air dielectric between the spirals and the ground plane. Performance suitable for satellite mobile system applications was demonstrated, including dual-band matching. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:987,990, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25090 [source]

    Compact harmonic control network for Doherty power amplifier

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2009
    Paolo Colantonio
    Abstract In this contribution, an innovative design solution to realize small size Doherty power amplifier is presented. The idea consists in the realization of a unique output matching network for both carrier and peaking devices without losing the Doherty behavior. Experimental results performed on uneven Doherty amplifier using GaN HEMT device is given to demonstrate the proposed approach. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 256,258, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23983 [source]

    A discussion on the performance of impedance matched antenna system and considerations for a better performance

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2008
    Adnan Kaya
    Abstract Impedance matching networks are used extensively in radio communications. In this study, ,-matching circuit has been used as a matching network. The return loss level of several impedance matched microstrip antennas are compared as a function of matching techniques. The ,-matching device is used to construct the antenna tuning units, which is only used to match the front module and the antenna. This circuit impedance region has been investigated analytically under the variable load condition. When the mismatch is occurred, the result is an increase in the energy consumption or transmission quality deterioration. In addition, the input module in antenna system could be damaged if reflection of the signal levels is excessively high. This is interesting application because antennas cannot be considered alone as component with changing electromagnetic properties. The rectangular microstrip antenna was designed at 2.5 GHz frequency by using microstrip feed line. Better return loss level which is ,16.86 dB has been obtained for this antenna using ,-matching circuit. It is shown that theoretical, simulation, and laboratory results are good agreement. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 410,415, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23101 [source]

    Dual band RFID transponder antenna designed for a specific chip without addtional impedance matching network

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2008
    Zhijiang Fang
    Abstract A simple and novel antenna for dual band transponders in RFID application is introduced. The antenna is designed for directly matching a commercial chip without additional impedance matching network. The simulated and measured results of the proposed antenna show that the transponders integrated with this antenna will be able to comply with the ETSI Air Interface standard in UHF band and ISO 18000-4 Air Interface Standard in microwave band. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 58,60, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22994 [source]

    Ultra-wideband COMOS low noise amplifier with simultaneous gain and noise matches

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2008
    Hsien-Yuan Liao
    Abstract Ultrawideband CMOS low noise amplifier (LNA) using lossy LC ladder is proposed. A lossy LC ladder matching network is combined with conventional inductive degeneration and provides both gain and noise match over multioctave bandwidth. The bandwidth is further enhanced by shunt peaking technique. The explicit formulas are derived in this work to determine the values of resistor and LC ladder elements to meet the gain and noise match conditions. The LNA achieves 10.8-dB gain with a 3-dB bandwidth from 1.6 to 13.2 GHz and a minimum noise figure of 3.4 dB under the power consumption of 22 mW. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 158,160, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22996 [source]

    Study of the influence of bias and matching networks on the distortion and memory of FET-based power amplifiers

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 6 2008
    Jon Santiago
    Abstract A study of the influence of bias and matching networks on the distortion and memory in FET-based power amplifiers has been carried out at the device and amplifier circuit levels. The study includes simulated and experimental results that allow us to identify effects produced by the introduction of particular biasing and matching networks in the power amplifier design. The influence of the bias point, as well as of biasing and matching network topologies on the nonlinear, short- and long-term memory behavior has been studied by means of simulations and measurements, using different power amplifier prototypes. © 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2008. [source]

    A 3-V variable-gain amplifier in Si/SiGe BiCMOS technology for 5-GHz WLAN applications

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 5 2005
    F. Alimenti
    Abstract A variable-gain class-A amplifier for 5-GHz wireless local area networks (WLAN) applications is developed using commercial 0.35-,m Si/SiGe BiCMOS technology. The amplifier is based on a cascode differential pair and is fully integrated with input and output matching networks. The design starts with application of the Cripps' method and it is further refined by nonlinear harmonic-balance simulations. These simulations are in good agreement with the measurements carried out at wafer level on a realized prototype. © 2005 Wiley Periodicals, Inc. Int J RF and Microwave CAE 15, 2005. [source]

    A discussion on the performance of impedance matched antenna system and considerations for a better performance

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2008
    Adnan Kaya
    Abstract Impedance matching networks are used extensively in radio communications. In this study, ,-matching circuit has been used as a matching network. The return loss level of several impedance matched microstrip antennas are compared as a function of matching techniques. The ,-matching device is used to construct the antenna tuning units, which is only used to match the front module and the antenna. This circuit impedance region has been investigated analytically under the variable load condition. When the mismatch is occurred, the result is an increase in the energy consumption or transmission quality deterioration. In addition, the input module in antenna system could be damaged if reflection of the signal levels is excessively high. This is interesting application because antennas cannot be considered alone as component with changing electromagnetic properties. The rectangular microstrip antenna was designed at 2.5 GHz frequency by using microstrip feed line. Better return loss level which is ,16.86 dB has been obtained for this antenna using ,-matching circuit. It is shown that theoretical, simulation, and laboratory results are good agreement. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 410,415, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23101 [source]

    A CMOS power amplifier with an adaptive bias scheme for mobile radio frequency identification reader applications

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2007
    Jeonghu Han
    Abstract A 900-MHz linear power amplifier with an adaptive bias scheme is fabricated using a 0.25-,m CMOS technology. The power amplifier operates over the range of 860,960 MHz, which is the ultrahigh-frequency band for radio frequency identification (RFID). All matching networks and RF chokes are implemented on a chip. The developed power amplifier provides a 1-dB-gain-compression point (P1 dB) of 27 dBm and a power-added-efficiency (PAE) of 28% at the P1 dB. The adaptive bias scheme enables the power amplifier to reduce the quiescent power consumption from 280 to 80 mW by adjusting the gate voltage of power transistors as a function of the input power. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1241,1245, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22435 [source]