Questions tagged [s-parameters]

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5
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2answers
8k 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 ...
3
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2answers
11k 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 ...
3
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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 (...
3
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1answer
280 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 ...
2
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2answers
285 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? Edit: -> Answer: The program (RFSim99) displays only abs, not squared (which is what I plotted). ...
2
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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 ...
2
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1answer
2k 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-...
2
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1answer
254 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 ...
2
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1answer
4k 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 ...
1
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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 ...
1
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1answer
96 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 ...
1
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1answer
193 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-...
1
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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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2answers
74 views

How is Wilkinson power divider lossy?

In an ideal Wilkinson power divider(because in practical there will always be resistive loss), the scattering parameters, or S matrix is given as: From the condition that checks if network is loss-...
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1answer
206 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
88 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
112 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 ...
1
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3answers
102 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 ...
1
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1answer
109 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 ...
1
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1answer
14 views

Material for Scattering parameters or S-parameters [closed]

I'm needing a good indication of material for Scattering parameters or S-parameters, with exercises. It have been so difficulty to me to find it out, and I need help from your.
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0answers
44 views

S21 phase vs phase shift measure

Hi am simulating in ADS microstrip T-lines for a 3 bit phase shifter, the lines are calculated to insert 55,110 and 220 phase shift for 2.16Ghz. With the S-Parameter simulation i can see the phase of ...
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1answer
21 views

Measure antenna S11 next to another source

I have a dipole antenna designed to work on ~800MHz and 2.44GHz frequency, and a miniVNA Tiny USB device that I can use to measure return loss of the antenna. I connect the antenna directly to the DUT ...
1
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1answer
56 views

Can these S-parameters be derived?

I have been trying to derive the S-parameters of a lossless T-junction of transmission lines. Here's a diagram from Google: This is an exercise in microwave network analysis, not in design, so the ...
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0answers
403 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 ...
1
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1answer
851 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 ...
1
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1answer
207 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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0answers
6k 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 ...
0
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1answer
31 views

What is a “loading capacitor for pin parameter measurement?”

I am designing my first PCB with an MCU and I see this section in the datasheet that brings up a loading capacitor used for pin parameter measurement. I don't believe this is load capacitance for a ...
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1answer
1k 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 &...
0
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1answer
547 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 ...
0
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1answer
896 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 ...
0
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1answer
769 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, ...
0
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3answers
370 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 ...
0
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1answer
505 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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2answers
1k 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 ...
0
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1answer
40 views

S-parameters vs device model

Many vendors provide both S-parameters and simulation models for their devices. Having encountered device models that when simulated, don't result in exactly the same S-parameters as the touchstone ...
0
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2answers
45 views

What's the S parameter in an Antenna

So, I'm struggling to understand what the S-parameter is in real-life terms; I mean, what does the S-parameter tell us about an antenna? I have designed a microstrip Wi-Fi antenna that should work at ...
0
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1answer
67 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....
0
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1answer
113 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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2answers
751 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
0
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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 ...
0
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1answer
249 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 ...
0
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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 ...
0
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2answers
176 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 ...
0
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1answer
456 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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1answer
3k 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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0answers
21 views

Voltage Division, Calculating S parameter of a 3-dB attenuator

I came across this example about evaluating the S-parameters of a 3-dB attenuator in my text book (Pozar, Microwave Engineering 4th ed); I could follow along calculating S11 and S22 but I got stuck ...
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2answers
38 views

Deriving the S-parameters, different Matched Loads possible?

I guess this is more of a conceptual question but for the problem below Im having trouble getting started on how to derive the S parameters for the network. I noticed that the network at 28.025 GHz ...
0
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1answer
38 views

3-phase inductance calculation homework

This is a homework question where i am stuck. Please help me out in this: Three similar impedances are connected in star across 2000 V, 50 Hz three phase supply. Power absorbed is 300 kW. ...
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2answers
39 views

What is the theory behind these current equations? (for Z paramaters)

In the photo below is shown the method for deriving z-parameters of the circuit. Apologies for my badly drawn values for resistors as they weren't shown in the original image. Basically I'm struggling ...