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microstrip transmission line in hfss
Yes, I also guess it's because of the size and the reflections.
Actually I did a coaxial cable model with larger size and the S11 problem does not appear.
Thanks so much!
However, this is only a minor experiment. I believe the problem can be solved
Here...
hfss simulation
Thanks so much, Micky74!
I gathered some data of the simulation of Microstrip I did.
The model is contained in an air box with radiation boundary.
The two ports are waveports without re normalization. Then the physical picture is a source and a load which perfectly match the...
hfss microstrip
Dear YoungEng
Thanks very much for your reply
I think you are right in the sense that S11 will never be zero due to minor reflections, but the S11 data I get is fluctuating in a broad bandwidth (0-80GHz)and the magnitude can be as large as 0.5.
Actually this morning I...
hfss microstrip line
anyone can help me out?
I checked pozar's book Microwave Engineering.
When the impedance of the feed line and the load is equal to Z0 of the microstrip.
The S matrix is like
S11=0 S12=exp(-betaZ)
S21=exp(-betaZ) S22=0
However in the HFSS simulation the S11 and S22 two non...
simulation of microstrip transmission line hfss
Hi everyone:
I am working on a minor study of microstrip simulation in HFSS.
I created a model of a microstrip line and add 2 waveports as the excitations .
In the results it shows the port Z0=59ohm@40GHz. the length of the microstrip is...
Hi All
Who has experience with modeling the low condictivity metal as transmission line electrodes ?
I find that if the electrodes conductivity is low (10000S/m), there will be decay and also the phase speed of the RF wave will be greatly changed since the R' or the resistance per unit...
model dimensions are beyond
Hi every body
I am now doing a simulation of the transmission line. What I need is the Characteristic Impedance of the transmission line, so I am using the solve port only function.
The model is a 1.5um dialectric sandwiched by two gold electrodes(around 500um...
I used CST4.2 before, but the problem is that:
First, it can not give the imaiginary part of the Charecteristic Impedance of a Microstrip line if the dialectrice between the two strips has finite conductivity like 5000S/m
Second, it does not have the Field Calculator like that in HFSS. So the...
Hi Everybody:
I am now using HFSS to simulate my structure, but I found that when I finish the analysis and draw the plot of the field of the port mode, it seems unable to change the plot properity.
Since my structure is in nature a complicated two plate microstrip while the distance between...
how to check an antenna impedance
yes, The line impedance or the wave impedance are the charateristic impedance of the feeding waveguide that has the same cross-section as the device cross-section, not the imput impedance of the device, that's the tricky thing
Re: The correspondance of a coaxial line to a transmission l
Oh, yes, your explanation really make sense. Actually the phase is a continous number. it is the problem of 360 substraction.
And actually although the value does not match very perfectly, the trend of the phase versus the length is...
Re: The correspondance of a coaxial line to a transmission l
Hi everybody:
Just now I create a very simple coaxial line model in both CST and HFSS to study the correspondence of real waveguide to transmission line model. But the result seems confusing.
My coaxial line is a inner PEC...
cst,pec conductivity value
I really appreciate your kindness.
Yes, I used to do simulation under CST, and is quite familiar with it.
but this time it is so strange that such a good software will not give img part of Z0
Now I am forced to use HFSS, but I really hope to use CST to solve this...
Hi, I am also facing the same problem, my initial try is to setup a double plates transimission line with lossy material sandwiched between the two PEC plates, and the thickness of the plates and the lossy layer between them are all in micrometer dimension, I can use both normal dielectric with...
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