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In the retrieval methods there are ususally ± roots and multiple branches. You should select the ones which are not violating the fundamental laws of physics. Imaginary n must be positive all the time. For example looking at your graph, I can say that you should select -n from 0 to 8.7GHz, +n...
Slow-wave factor is defined as c/Vp or β/ko. ko=2πf/c and β is the imaginary part of the propagation constant (γ=α+jβ). You can calculate it from ABCD matrix or from S-parameters...
For waves to be fast, their group velocity should be greater than speed of light c. If the group velocity is less than speed of light, it is called slow-wave. By playing with the refractive index of a medium we can make the wave slow, fast or ordinary.
2d spiral dxf
Once imported, you cannot change any parameter in the layout. You can modify the objects by adding or substracting other objects but you cannot change the spiral parameters.
log spiral
Above code gives you a 1D spiral curve. However by defining the width you can make it a 2D planar spiral strip.
I'm not an expert on AutoCAD lisp routines so I don't know. I always do it manually...
draw spiral autocad
The following routine will draw you a 100-segment Archimedean spiral given by the polar equation
r=A*ang^(1/nn)
where the polar angle "ang" sweeps 0 rad to 3*pi rad.
When you draw the spiral simply select the curve, use "_pedit" command and then "w" to assign a track...
xudong chen metamaterial matlab code
I'm working on the similar problem and it is a very tricky issue. You have to be very careful since each method has some weakness due to certain assumptions and approximations. Structure geometry and symmetry properties have important influence on the...
Below, they use a Vivaldi antenna at 60 GHz. There are people using simple bond wire antennas, too.
h**p//www.ihp-ffo.de/fileadmin/ihp-template/departments/circuit-design/news/WWRF16_SUN.pdf
Perhaps you can call it "EBG structure based on perforated microstrip line" or "periodically loaded microstrip line". Make sure that the structure has the stopband property by simulating a portion of the microstrip line itself without the antennas. The distance of the structure to the antenna...
Re: EBG structures
It depends what kind of structure you have and what the application is. There are several types of EBG structures. The first designs consist of holes drilled in the substrate. A few other structures have holes etched in the ground plane only etc.
In general, EBG strutures...
Re: AUTOcad help needed!
Firts of all equation based curve came with HFSS v.10. If you are using an older version, you cannot find it. Equation based curve is very easy to use. All you need to do is to transform your original equation into a pair of parametric equations of a free variable 't'.
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