Questions tagged [s-parameters]
Scattering parameters or S-parameters (the elements of a scattering matrix or S-matrix) describe the electrical behavior of linear electrical networks when undergoing various steady state stimuli by electrical signals.
140
questions
2
votes
0
answers
38
views
Unable to replicate Twisted IFA antenna S-parameter curve using ANSYS HFSS 15
I am attempting to replicate the S-parameter curve for an antenna design as described in the paper "Antenna Design and Analysis" with DOI: 10.1109/LAWP.2009.2015345 using ANSYS HFSS 15.
Here ...
- 31
0
votes
0
answers
19
views
How to conduct temperature variant EM simulations in HFSS?
I want to conduct temperature variant EM simulations in HFSS i.e. simulate s parameters of a CPW at various temperatures. I am using a temperature variant material using thermal modifiers. I have also ...
0
votes
0
answers
40
views
Using Kirchhoff's voltage law for calculating S-parameters
Consider the following circuit:
for which I'd like to calculate the S-parameters of the impedance \$Z\$ (and assuming \$Z_G\$ = \$Z_L\$ = \$Z_0\$). Will it be correct to use the Kirchhoff's voltage ...
- 101
0
votes
1
answer
48
views
S-parameters of a matching network
I have the following matching network designed for \$\omega=2\pi\cdot 1GHz\$ and I want to calculate \$S_{11}\$ and \$S_{21}\$. The normal definitions/calculation setup for S11 that I use are in the ...
- 675
0
votes
0
answers
46
views
S21 calculation
In this post
It mentioned that there's a factor 2 in S21 value.
But I'm still don't understand why there's a 2 in it.
My schematic is shown below.
Shouldn't S21 = Vout/Vgen?
My question is: where is ...
- 141
0
votes
0
answers
54
views
Transimpedance Amplifier Gain ac and S-parameter Analysis
I'm currently working on finding the transimpedance gain of a transimpedance amplifier. However, I've encountered an issue where I get different gains when performing AC analysis compared to S-...
- 150
2
votes
0
answers
46
views
How to create schematic of common mode choke that reflect on Common mode, differential mode and mixed mode? [closed]
I aim to create a schematic that can replicate the results exactly as seen in the measured S4P file. I have conducted the measurement using a VNA and am attempting the schematic simulation in CST. ...
- 101
0
votes
2
answers
55
views
S-parameter of cascaded system, port impdance
I have a question about the s parameter of the cascades system.
Assuming that there are two system A,B as shown in the figure and each has an s-parameter measured at 50ohm port,
I understand that the ...
- 1
1
vote
0
answers
34
views
How are SPICE files created compared to S4P files generated from a VNA?
When measuring impedance versus frequency using the same data in both SPICE and S4P formats, why do I obtain different results?
COMMON MODE IMPEDANCE
Common mode impedance 10514 Ohm at 79.1 MHz
S4P ...
- 101
2
votes
0
answers
49
views
Challenges in Bandwidth in Common mode Choke Modeling
I'm currently working on characterizing a common mode choke (CMC). However, I'm encountering difficulties aligning the bandwidth of my model with the measured results. Specifically, when I attempt to ...
- 101
0
votes
1
answer
53
views
Why is a bandwidth discrepancy occurring despite consistent Q factors in the given Graph?
I was trying to do curve fitting the common-mode choke in CST Studio according to the selected S4P file from TDK (ACT1210G-800-2P-TL05).
However, the common-mode impedance measured from the file does ...
- 101
1
vote
0
answers
74
views
Why my Common mode choke with 2 turns showing multiple Peaks in the graph?
I analyzed the CMC choke by Wurth Electronics (part no: 744830039080) using VNA and obtained the insertion loss for both common mode and differential mode.
The graphs match with the datasheet:
While ...
- 101
2
votes
1
answer
48
views
AC analysis of a Bias Tee
I am designing a bias tee here and wondered whether it actually works or not? Hence I conducted an AC analysis instead of S-parameters (after verifying that s parameters are okay). The bias tee has ...
0
votes
0
answers
58
views
How do you de-embed a shorted 2-port fixture?
I've been working through reproducing Steve Sandler's 2-port shunt-through measurements (2019 SIJ article, Picotest slide-deck). My target is to measure capacitors with ESR down to 1 mΩ with an ...
- 1,620
0
votes
1
answer
45
views
Matched junction S parameters
This question was asked in a competitive exam in India. Two-port S matrix is assumed here.
For matched junction S parameters, which of the following is correct ?
(a) S11 not equal to 0
(b) S11 equal ...
- 387