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hfss permittivity
you can calculate the real and imaginary parts of permittivity/permeability in matlab using your drude/lorentz whatever model. and then you need to calculate the tangent delta electric/magnetic using these real and imaginary parts. you need to write these parameters in a data...
diode in hfss
for mtts's question,
you can model the varactor as resistance + capacitance. you can use two RLC components in series in HFSS. that's how we model varactors.
look at varactor's data sheet to find out R, C, and the physical size of the varactor...
Re: HFSS simulation error
you cannot place a waveport inside your geometry, unless it is backed with PEC. therefore, waveports are usually placed at the outer boundary of the model (which is backed with PEC by HFSS automatically).
if two different materials will be on both sides of the port...
increase bandwidth project
what is your permittivity? is it fixed?
what are your antenna dimensions (patch and substrate)? are there any constraints on the antenna size?
the easiest way to increase the bandwidth is to increase the antenna thickness. do you have any constraints on that?
in my...
hfss_desktop
you can install to vista in xp compatibility mode. the 3d modeler has some bugs, though, the model view changes back and forth... it's hard to explain here...
how to measure return loss of antenna using vna
for return loss (S11) it is OK. but for gain, it is not that trustworthy. you need to make this measurement in an anechoic chamber without any multi-reflections, and you should apply time gating (to clear out the effects of reflections, bounce...
Re: Gain Enhancement
what is the antenna height you use here? are you assuming PEC for the patch, or realistic materials like copper with finite thickness, or finite conductivity boundary condition?
if you are using realistic materials, like copper, then I advise you to increase your antenna...
the best antenna close to a patch is the annular ring (also called loop) antenna. patch antenna resonates at λ/2 distance. for loop antenna this is approximately λ/4.
if you make the width of the transmission line in loop antenna narrow, you can make its size smaller and smaller (since the...
i have explained this in another post:
edit: you need to calculate the transfer (ABCD) matrix from [S] matrix. for 2 port networks this is easy using formulae from books. for more ports, you can still find a formula of conversion.
metamaterials software
I have tried this a few years ago in CST. As you said, it doesn't allow any mu/eps with negative real parts. So I switched to HFSS.
HFSS is capable of simulating any combination of eps/mu with any sign and loss. I have compared analytical formulations for different media...
annular ring patch antenna
you can simply use the cavity model for annular rings... look in microstrip antenna design handbook, or any other microstrip antenna book...
this usually happens when the dielectric materials are not assigned any losses. also most probably radiation boundaries are not meshed as good as the dielectrics and efficiency is calculated wrong...
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