Questions tagged [s-parameters]

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45 views

Soldered wire or test connector for VNA measurement?

I am designing a PCB for a IoT device, which will have an antenna inside a space-constrained plastic enclosure with metal screws. I know that I will have to tune the frequency response of the antenna ...
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28 views

S parameter files in ADS Keysight

I have two different .s2p files of a diode, one for when it is on (5V and 1mA) and one for when it is off (0V). I can create a model of a diode for each of these two occasions, but I can't have them ...
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1answer
30 views

Can I get the S21 parameter from a one-port open, short and load reading?

I am currently working with a custom rectangular waveguide, which has one port abled to connect to a VNA,(call it port a) but the other side cannot, (its part of a bigger system but for now its only ...
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1answer
31 views

Can a Unilateral Amplifier be Unstable?

When designing microwave amplifiers, stability is an important factor to consider. Stability is usually measured with the K factor. In a unilateral network, S_12 = 0, and this makes the K factor ...
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27 views

Can I determine 2-port s-parameters from 1-port measurements?

I have a 1-port impedance bridge. Can I get the four s-parameters of a 2-port device by measuring each "sending" port with the "receiving" port terminated in Z0 and reversing the measurement to get ...
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1answer
44 views

Coupling coefficient of microstrip resonators

I am working in HFSS and I'm trying to determine the coupling coefficient between two microstrip resonators (k) so that I can design a filter using a certain resonator shape. I have the formula I need....
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1answer
25 views

Scattering Matrix with Power Waves and Voltage Waves

I read that for a given N-port network there are two different conventions about defining the incident and reflected waves. This is the first convention: This is the second convention (we see that ...
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1answer
57 views

How to model a one-port (reflection) measurement in SPICE?

I have the equivalent circuit for an antenna and I would like to use SPICE to simulate the \$S_{11}\$ (reflection coefficient) response. I know how to simulate two-port measurements (like shown here),...
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1answer
114 views

How do I find the return loss of a transformer from its 4-port S-parameter data?

I'm looking for information on the performance of Mini-Circuits T16-1-KK81+ transformer. The transformer is well-characterized, Mini-Circuits provided both insertion/return loss charts and raw S-...
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35 views

Time Domain Reflectometry and reflection coefficient graph

I know it is possible to see if there is a mismatch on a certain device (for instance a transmission line of length L connected to a load) by using the TDR (Time Domain Reflectometer). It allows to ...
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1answer
77 views

Question on Matched 3dB attenuator

For the second picture below, how to derive the expression for Vo ? I suppose there is some in-betwen maths that I missed out. Note: 41.44 ohm is the parallel equivalent for (50 ohm + 8.56 ohm) || ...
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1answer
271 views

How to interpret s parameters including S21 on Smith chart on VNA display

I'm trying to become re-acquainted with S parameters, VNA, and transmission lines for some projects at work. I'm using Agilent, Advanced Design Simulator, to practice on the computer and to get the ...
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40 views

Z parameters to Input and Output Impedance Conversion Question

I have to design a matching network for BGA7027 at approximately 870 MHz. My understanding goes that I should convert the S-parameters given in the datasheet to Z-parameters, from which I find Zin and ...
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2answers
463 views

How to measure S11 of antenna using VNA for one port S-parameter measurement?

I have an antenna. I want to measure S-parameters of it using a network analyzer. I am not clear how to do it. Please explain. Thank you
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1answer
47 views

Contribution of solder parasitic to S parameter measurement

I have an antenna. I want to measure S-parameters of it using a network analyzer. The antenna has to be soldered to SMA cable for the measurement of S-parameters. After the calibration, will the ...
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30 views

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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157 views

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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422 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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261 views

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
32 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
108 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
446 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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40 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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1answer
132 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
554 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
1k 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
313 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
117 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
45 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
205 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
34 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
161 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
164 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
100 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
63 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
40 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
407 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
2k 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
205 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
837 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
60 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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0answers
5k 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
110 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
675 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
4k 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
274 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
100 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
324 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
82 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
81 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?