Questions tagged [s-parameters]

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even-mode to odd-mode impedance ratio for balun

How do we see from the following expressions that LARGE even-mode to odd-mode impedance ratio is very important for balun ? How to derive the two expressions involving Ya, Yb, Zoe,Zoo ?
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import touchstone file into ltspice [duplicate]

Does anyone know how to import Sparameter (touchstone) files into ltSpice and how to use them? I have downloaded s3p format file, but I don't know how to use it. I cant find any information in the ...
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33 views

S parameters LT SPICE

I read the help section on .net and found that i can use either a node (Vout) or a resistor (I(Rout)) to specify the output node. However the 2 give me different values of S parameters for the below ...
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Unitary property of scattering matrix

From s-parameter lossless network definition , The sum of the incident powers at all ports is equal to the sum of the reflected powers at all ports. But how do we derive the above unitary property ...
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1answer
29 views

Influence of incident signal on antenna S-parameters

I'm interested in determining the phase of an incoming signal using a 1-port Vector Network Analyzer (VNA). The antenna would be receiving a signal while connected to the VNA. I know that the S11 ...
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1answer
67 views

What are the s-parameters of a rg58 coaxial cable?

Can a the s-parameters of a rg58 coaxial transmission line be calculated. If yes, what are they?
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1answer
139 views

Finding Z-parameters from a two-port network and using them to find S-parameters

So I have the two-port network and I want to find out the Z-parameters of it (and later, use that to find the S-parameters). For the assignment, \$R_x=8Ω\$. From what I understood, I should null ...
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26 views

s-parameter matrix analysis

So I'm trying to figure out how I can analyze S-parameter matrices. The i. should be pretty straightforward, though I'm not 100% sure if I am correct with what it means. I'm assuming that there's ...
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36 views

How do the transfer functions of lumped and distributed circuit differ?

The transfer function of an electrical circuit can also be described as the \$S_{21}\$ parameter of the S-matrix. As far as I know the S-Matrix can be applied for both lumped and distributed circuits. ...
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1answer
40 views

How to convert from S-parameters to power gain?

With reference to the part below, which states 17dB gain at 500MHz for Vce = 12.5V https://www.digikey.co.uk/product-detail/en/stmicroelectronics/PD55003TR-E/PD55003TR-E-ND/1664253 It's data sheet ...
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1answer
156 views

Difference b/w Symmetric and Reciprocal Networks

A circuit exhibits symmetry when interchanging ports across a plane of symmetry results in no change in the impedance, admittance or scattering parameters of the circuit. Reciprocity also means ...
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1answer
351 views

F-parameters instead of S-parameters

What are the F-parameters, how are they computed in CST and what is the relationship between S- and F-parameters? In CST, they can be obtained, when running the integral solver and having a farfield-...
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1answer
75 views

Interpreting scattering parameters on a Smith chart.

I'm trying to become reacquainted with microwave circuits and how to analyze them, especially with a VNA. Just to get some practice I'm using Keysite ADS simulator. To get the feel of it I used the ...
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1answer
57 views

Solving for y parameters using a system of equations

simulate this circuit – Schematic created using CircuitLab Question: Find the y parameters for the circuit shown below. My attempt: KCL \$I_1 = I_3 + I_6 \$ \$I_4 = I_3 + I_5\$ \$I_5 = ...
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1answer
40 views

Connect 3-port and 1-port devices defined by S-matrices

There are two linear networks. The first is defined by 3-port S-matrix: \$\mathrm{S}_\mathrm{A} = \left[ \begin{array}{lll} s_{11} & s_{12} & s_{13} \\ s_{21} & s_{22} & s_{23} \\...
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1answer
113 views

How to bias MOSFET for finding S-Parameter simulation?

I wanted to use a BSIM4 model of NMOS in my circuit. I got the correct dc biasing point, certain VDS,VGS and IC. But I am having issues measuring S-parameter data for MOSFET amplifiers. I simulated ...
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1answer
31 views

How do the Ripple Limit lines get determined on antenna measurements?

I'm doing an S21 ripple measurement through a VNA and I understand how the measurement is done, but I don't understand how the limit is determined. I know you can specify the limit in dB and then you ...
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2answers
118 views

calibrating vector network analyzer with \$75\Omega \$ coax

I am new to electronics and I just began to use a vector notwork analyzer for some measurements. I calibrated my vector network analyzer with both ports connected to 50\$ \Omega \$ coax cables with ...
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1answer
101 views

S-Parameters math confusion

S11 for marker 1 says -47.661 dB Two Questions 1st ..... What is | S11 | ^ 2 2nd Is this accurate ? g = 20 log_10(-47.661) dB
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1answer
79 views

S - parameters or scattering matrix

i have written in dsp.stackexchange.com, but guzs have written me this question would be better off on this site. I have questions according to how to measure s- parameter. I have a two-port ...
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1answer
49 views

Effect of large capacitor for differential channel in S-parameter simulation

I have created a differential channel with Transmission line and interconnects for simulation. In the real channel, there is 100nF capacitor in between 2 transmission lines. Now the problem is when I ...
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1answer
39 views

Are h- and g-parameters only applicable to two-port networks?

There are plenty of references to various ways to represent two-port networks (S, Z, Y, T, ABCD, h and g parameters). S and T parameters are commonly generalised to N-port networks. Is the same true ...
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1answer
286 views

Measure 4-port device with 2-port VNA

I need to measure a 4-port device (a directional coupler) using a 2-port VNA. This answer covers the basics, and this document goes into more detail. My problem is that I'm not sure how to perform ...
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3answers
1k views

Why is it so important that an amplifier is unconditionally stable?

When studying microwave/milimeter wave amplifier design, one often finds discussions about stability. Stability means that the amplifier will not generate signals by itself (except for noise). As we ...
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1answer
150 views

Simple Impedance/Admittance based Transmission/Reflection Simulation

TL;DR: Why does the (pseudo-)code below produce a different output than a proper simulation software? Full problem description: I want to be able to simulate simple (idealized) RF circuits, such as ...
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1answer
632 views

How do I make the document parameters in Altium visible?

I am currently using a student license for Altium and I am trying to edit the "title" and "drawn by" parameters in my schematics. However, I am unable to do so due to a locked visible option when ...
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1answer
58 views

Compute loss/inch for (differential) T-line from s-parameters?

I have the 4-port s-parameters of 2 PCB boards, where each board consists of a differential transmission-line with SMA connectors on either end. The only difference between the boards is their trace ...
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3k views

How do I convert S-parameters for impedance matching?

How do I derive the Z-parameters to calculate a matching network for a device? I'm not sure what terms to even search for as I get all sorts of information I am not familiar with. My task is to ...
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1answer
85 views

Is it possible to save data from a network analyzer?

Im using N9917A Network Analyzer for measuring s-parameter values. I have connected the VNA to PC via Ethernet cable, where I can view the resulting plots of s-parameter values. If i get 15 plots of s-...
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1answer
525 views

S-Parameters of lossy two-port network

I have a lossy passive two-port network with some input mismatch, so, $$ S_{11} \neq 0 $$ By simulation, I find the S11 and S21 parameters. What I would like to know is the losses within the network, ...
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1answer
3k views

Converting S parameters to Z parameters - divergence

I have cause to convert some Z parameters to S parameters and vice versa. Here is the conversion for \$Z_{11}\$; $$Z_{11} = {((1 + S_{11}) (1 - S_{22}) + S_{12} S_{21}) \over \Delta_S} Z_0$$ where $...
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1answer
206 views

Smith chart plot from simulation is opposite from experiment?

I did a simulation of an antenna and replicated the antenna in an experiment however the simulation is coming out to be roughly the opposite. From the experiment I was expecting this plot to spiral ...
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3answers
92 views

S-parameter measurement of thin polymer film

I need to obtain S11 and S21 to calculate loss tangent of polymer(PVDF) in C-band. I have an access to vector network analyzer, to use it I must somehow attach 2 SMA connectors to polymer and here ...
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3answers
230 views

Scattering Parameters and different load

I am somewhat confused as to the correct usage of s-parameters. Looking at the problem statement below, would the S-parameters given need to be "transformed" due to the load impedance being different ...
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1answer
73 views

Measuring small capacitor parallel to big inductance (Network Analyser)

So what I have at hand is a cheap network analyser that can present the measured impedance in form of the values of different equivalent circuit topologies, e.g. R-L series or RL parallel. What I ...
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1answer
65 views

S21 parameters multiplication

I have a two port system which consists of two subsystems. Is the multiplication of S21 parameters of the subsystems equal to that of the whole system?
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1answer
2k views

How to identify semiconductor parameters for spice model?

I am simulating circuit which uses NPN IRFZ44N power MOSFET and MBR1560CT rectifier (used in the circuit just as a shottky diode, connecting 2 out of its 3 legs only). Here is a circuit made in “...
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1answer
435 views

How to do theoretical calculation of S parameters

I created a test bench for bond wire in ADS EM simulator and got the following graph in the picture I attached. I'm trying to compare the values which I got in ADS with theoretical one. But I'm ...
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1answer
1k views

S-parameter bi-section for deembedding

I've recently come to suspect the effects of connectors on my measurements. I'm looking at several different ways of de-embedding their effects from measurements that I take with a network analyzer (...
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1answer
312 views

SPICE how to assign a variable voltage generator for receiving antenna

I would like to do an AC analysis, noise analysis and signal to noise simulations using TINA TI - LT spice is OK How do I assign a variable voltage with parameters to an AC voltage source in SPICE? ...
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2answers
5k views

S parameters of a capacitor

I am struggling to understand S parameters. As an example, I am considering the S matrix of a capacitor in series with a transmission line. It has two ports, so must be represented by 2x2 matrix. But ...
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2answers
909 views

S-parameter measurement of a 3-port splitter

I am looking for possible ways to measure s-parameters of a 3-port power splitter (1 input and 2 outputs). It is similar in concept to a wilkinson, but also provides matching and none of the ports are ...
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1answer
3k views

Parsing .s2p data through an automation script to plot graphs of the various s-parameters

Need to find a way to quickly decipher and plot s-parameters for tons of .s2p files in a short period of time. In specific, I need to plot the angle of the s-parameters versus frequency and then the ...
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1answer
979 views

Any Way of Converting Several 2-Port S-Parameters Measurement to 4-Port S-Parameters

I have a bi-driectional coupler and attenuator (att) in which I would like to capture its s-parameters: So I measured 2-port s-parameters between ports 1 & 2, 1 & 3, 1 & 4, 2 & 3, 2 &...
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2answers
8k views

Reading S2P Files - What Does Each Column Represent

I'm having a hard time reading s2p files. For an example say that I am measuring the parameters of a 2-port network (port 1 and port 2). What do each columns represent? I can tell that the first ...
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2answers
2k views

Why do we use S-parameters for High frequency signals?

I have read at numerous places that S-parameters are used for analyzing systems which deal with high frequency. But why only high frequency? From what I have read, I have understood the following ...
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1answer
252 views

How to pick a Push-Pull Transformer?

I have to admit up front this is a borderline shopping question. But the fact is I'm looking at an application note from Linear Technologies. That application note calls for Coiltronics CTX02-14659 ...
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1answer
236 views

Scattering matrix Transmission Matrix lasers

I would like to ask if anyone can suggest me a good tutorial about Scattering and transmission matrices for lasers. I am really struggling with some issues and the majority of the literature analyses ...