Knowledge Centre
Find a document written by the best international scientists in our secure database.
24776 documents found.
A MONOLITHIC HEMT-AMPLIFIER WITH FEEDBACK IN COPLANAR WAVEGUIDE TECHNOLOGY
A Monolithic Technology HEMT -Amplifier with Feedback in Coplanar Waveguide *W. Bischof, *w. Ehrlinger, * *M. Berroth, * *W. Reinert ABSTRACT A monolithic integrated wide-band amplifier is presented, which consists of two 0.3 pm HEMT-stages in GaAs/GaAIAs-Technology. The main signal path consists of a coplanar waveguide, which interfaces conveniently to the HEMT-cells. A feedback circuit wi
METHODS OF MICROWAVE MIXERS CAD
METHODS OF MICROWAVE MIXERS CAD B N Shelkovdikov* Y L Lomaka** , K S Sunduchkov** , A A Mikryukov* , G Y Serdyuk**, , 0 Y Kolchanov* ABSTRACT Various approaches to a CAD of microwave mixers are considered and one of the modifications of harmonic balance technique chosen. Software for nonlinear and linear circuits design are briefly described. Stages of microwave mixers design are written
OPTIMIZATION OF THE OUTPUT CIRCUITS OF POWER FETS BASED ON THE MISMATCH POWER PENALTY
OPTIMIZATION OF FILE OUTPUT THE MISMATCH CIRCUITS OF POWER POWER PENALTY FETS BASED ON Dan Raicu ABSTRACT A new approach to the optimization of the output circuit for a power FET is proposed, whereby the quantity maximized is directly the saturated power delivered by the device rather than the return loss referenced to the optimal load impedance for power. Thus, the power performance of the
SENSITIVITY ANALYSIS OF LOSSY COUPLED TRANSMISSION LINES WITH NONLINEAR TERMINATIONS
SENSITIVITY ANALYSIS OF LOSSY WITH NONLINEAR TERMINATIONS COUPLED TRANSMISSION LINES Stephen Lum *, Michel Nakhla t, and Qi-jun Zhang t ABSTRACT An analysis method is described for the evaluation of the time domain sensitivity of nonlinear networks which include lossy coupled transmission lines. The method combines a linear sensitivity analysis method based on the numerical inversion of Lapla
A SIMPLE, PHYSICS BASED DUAL GATE MESFET MODEL FOR CAD APPLICATIONS IN MICROWAVE FREQUENCIES
A SIMPLE, PHYSICS BASED DUAL GATE MESFET MODEL MICROWAVE FREQUENCIES Andre Neubauer, * Thomas Sporkmann .*. ,Ingo Wolff FOR CAD APPLICATIONS IN ABSTf~ACJ A simple, analytical model for Dual Gate MESFETs is presented in this paper. The Sparameters of a Dual Gate MESFET are derived and the calculation of the equivalent small signal circuit is discussed. This model can efficiently be applied to
AN EFFICIENT TECHNIQUE FOR COMPUTING THE S-PARAMETERS OF MESFETs FROM A SEMICLASSICAL MODEL, INCLUDING THERMAL EFFECTS
AN EFFICIENT TECHNIQUE FOR COMPUTING THE S-PARAMETERS OF MESFETs FROM A SEMICLASSICAL MODEL, INCLUDING THERMAL EFFECTS J. C. A. D. Santost, M. J. Howestt and C. M. Snowdentt ABSTRACT The Fourier decomposition method is used to compute the small-signal parameters of GaAs MESFETs via a semiclassical electro-thermal physical model. The discrete system of equations is first linearised to avoid factori
SCATTERING OF A GUIDED MODE BY A FINITE GRATING OF SLOTS: APPLICATION TO METAL- DIELECTRIC RADIATING STRUCTURES
SCATTERING OF A GUIDED APPLICA TION TO MET AL- MODE BY A FINITE DIELECTRIC RADIATING GRA TING OF STRUCTURES SLOTS: Victor ABSTRACT 1. Kalinichev* The diffraction problem of the guided mode scattering by a finite grating of slots fabricated on one side of a metallized dielectric layer is treated. The magnetmotive force technique is essentially used. Moreover the mtual coupling effects between
MICROSTRIP PHASED ARRAY ANTENNA WITH A MULTI-LAYER SUBSTRATE FOR SHAPED ELEVATION PATTERN
MICROSTRIP PHASED ARRAY ANTENNA WITH A MULTI-LAYER FOR SHAPED ELEVATION PATTERN V.MATSUZAWA; V.KUWAHARA; T.TAKAHASHI; SUBSTRATE M.HANEISHI;; ABSTRACT Experimental large aperture phased array antennas made of microstrip antennas (MSA) have been reported recently, It is difficult to design a feed line of a phased array antenna which uses a scanning shaped beam for the desired beam shaping[l]. We
Ku BAND PLANAR ANTENNA WITH HIGH EFFICIENCY AND EXCELLENT CROSS POLARIZATION ISOLATION
Ku BAND PLANAR ANTENNA WITH HIGH EFFICIENCY AND EXCELLENT CROSS ISOLATION POLARIZATION Hirohiko Yamamoto, Koichi Tsunekawa, Hiroshi Nakano, Tomozo Ohta+ ABSTRACT The design and performance of the planar antenna having high efficiency and excellent cross polarization isolation for the consumer use are described. The antenna is mainly composed of microstrip radiating elements and the triplat
CHARACTERIZATION OF PRINTED ANTENNAS WITH A LIMITED GROUND PLANE
CHARACTERIZATION OF PRINTED ANTENNAS WITH A LIMITED GROUND PLANE J.L. DUBARD*, L. CIRIO*, D. POMPEI* Abdract:A new numerical processing method is applied on the timedomain signal given by the Transmission Line Matrix method (TLM). It provides the possibility to characterize antennas such as stacked patches with a limited ground plane. We describe the techniques to obtain the radiation patterns, th