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This post is about impedance matching of Rf power transistor, these power transistor usually have low input/output impedance like z= 2.1 - j3.9,
The first question is that what is the usual practice for matching this low transistor impedance to standard 50 ohm, Is single stub matching is the...
designing fractal antennas
MoM based full wave EM analysis CAD tools like ADS momentum, Ansoft Ensemble are good option for simulation of fractal antennas
I am trying to simulate an aperture coupled microstrip antenna in CST microwave studio but it is giving error
"parallel symmetry planes! No farfield calculation possible"
What is the problem I haven't set any symmetry plane! why I am not able to get fafield data.
Re: Microstrip
In order to make a microstrip circuit you need to know PCB board εr,height ,Cu thickness t and tanδ. You can use these parameters to find the width of line for a given characteristic impedance Zo at your frequency of interest.
Generally high εr boards are used at lower frequency...
It is an advertizement from Zeland located on the backside of front cover in:
"IEEE Antenna and propagation magazine"Vol. 47,No.3,June 2005
and regarding Ansoft designer/ensemble the paper is
"New planar field solver for very large and very small structures",By Lawrence Williams, Ph.D.,Brian...
ANSOFT Designer(Ensemble):
Ansoft designer SVD(singular value decomposition) fast solve technology claims to be able to simulate 30,000 unknowns with 2 GB Ram.
IE3D 11.06:
Using GEMS(generally effeceint matrix solver)claims to solve 63,597 unknowns with 548 MB RAM.(IEEE Ant. & Prop. magzine...
I need the following Microwave Journal papers I try to find them on "www.mwjournal.com" but there are only papars from 1995 onwards.Can somebody upload them.
[1]L.Sikora and J.Womack,“The art and science of manufacturing waveguide slot-array antennas,”Microwave J.,pp.157–162, June 1988...
If the structure being modeled has a plane with field on one side of a plane being the mirror image of the field on the other side,take advantage of the symmetry.
"The plane of symmetry must cut through the middle of all the ports applied to the structure. Otherwise,there may be only phsycal...
Abstract
Advances in device technology are driving the need for
circuit boards capable of carrying digital signals at frequencies
greater than 1 GHz. While in recent years there have been
significant achievements in various aspects of boardmanufacturing
processes, little has been done to improve...
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