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# s11 s22

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183 Threads found on edaboard.com: s11 s22

Hi All, I set up a circuit to check sp analysis in cadence. I m having 2 ports with one port has 50 ohm and another port has 100ohm. I connected these two ports together.While I am doing SP analysis, I got the following results. s11 = s22--> 333.33m S12=S21 --> 942.809m

## True Large Signal Differential Input Impedance Evaluation

I want to measure differential mode input impedance of true large signal differential driving. Target frequency is around 1GHz. How can I do this task ? I don't mean conversion from large signal single-ended driving like following. {s11, S12, S21, s22} -> {Sdd, Sdc, Scd, Scc}

## results do not match with datasheet

s22 looks much worse than s11 on top of the S21 mentioned by FvM. I would be very suspicious of something on the output (assuming your line is good 50ohms for 10GHz).

## How to get Log_Scaled Value of S-parameters in HFSS??

Hello Dear All, my question is how*to plot the Log Scaled Value of S-parameters in HFSS. I want to get*the value of s11, S12, S21 and s22 in log scale. I know how to plot normal S-parameters in units of dB, dBm , (real and imaginary parts) etc. But I need the log_scaled_Value. If anyone know it, Please help me to get the required values of S-

## Wrong HFSS Simulation result

Hi everyone I've simulated a coupled line band-pass filted using HFSS 2015. s11, s22, and S21 are reasonable and like my expectation, but S12 is irrationally deformed in passband. See below [url=obraz

## S11 & S22 Return Loss

What is the best frequency for a Point to Point connection based on this s11 / s22 Return loss graph? Insufficient data to make a selection. What is your signal BW? What are your regulatory restrictions? What is this a plot of?

## Inductive coupling power transmission

It is very general question to have details as S parameters have lot of details the point is what is important for you If we look as s11 and s22 the plots are not identical it means there is some directional element in the system like circulator. If we have a look at s11 it clearly indicates a very powerful resonance mode around roughly 2.4 (...)

## optimization in hfss

Sorry but your word optimization is very broad . S parameters define the behavior of RF Structure like for two port network s11 and s22 define the reflection at port 1 and port 2 and S12 and S21 define the transmission. All of these parameters are highly frequency dependent and frequency of any RF structure is dictated by parameters of structure. S

measured_data=read(rfdata.data, 'f150m_a.s2p'); s11_hid = smith(measured_data, 's11'); set(s11_hid, 'color', 'r', 'LineWidth', 2) hold on s22_hid = smith(measured_data, 's22'); set(s22_hid, 'color', 'b', 'LineWidth', 2)

## Find Scattering parameters from this picture

={s11, s12, s21, s22} I assume this is characterized by reference impedance=50ohm. s11_new=s11*exp(-j*2*(2*pi/lamda*lamda/8))=s11*exp(-j*pi/2) s22_new=s22 s12_new=s12*exp(-j*(2*pi/lamda*lamda/8))=s12*exp(-j*pi/4) (...)

## 6bit Attenuator Combining Problem

Hi, I am designing a 6 bit attenuator and facing a problem when I combined them together.Each bit individual work properly it achieved proper attenuation proper s11 and s22 but unfortunately when combined them together cant get required attenuation and s11 s22. Plz help me in this regard what will be the possible causes. T

## Sparam Inductor with HspiceRF

In the simulation, I get the following warning for different frequencies: "S parameters are not passive at (value of freq) Hz. Will be regarded as noiseless.No. If s2p is passive, |s11|**2+|s21|**2<=1.0 and |s12|**2+|s22|**2<=1.0 have to be satisfied. How do you get S-parameter for inductor

## S to RLGC in ADS (S2RLGC in MATLAb)

I have S-parametrs(s11,S12,S21,s22) for line in my topology - calculated in ADS "momentum", how I can get out of them "RLGC line parameters" in ADS ? (in MATLAB - "S2RLGC" function) ADS have: schematic->tools->spice model Generator-> Narrow Band Generator -> ***.S2P to Lumped PI-network model generate file in spice R1 1 0 10331.354

## S11 and S22 are very close to zero in LNA

Hi, I tried to have a LNA with the best value of performances for schematic and layout. The problem is that s11 and s22 are about -2 and -5 in the layout respectively. I know those values should be as negative as possible but I couldn't make a better values for them if I want to keep the gain high enough. Can you let me know if s11 (...)

## s21 and s12 parameter in lna

here all here i am designing current reuse lna in cadence and i got s11 = -24 db and s22 = 26db but s12 = s21 = -44 db what parameter should i change to get proper output at 2.4 Ghz at 0.18um technology

## 60GHz integrated amplifier design S22 problem

Your s11 is also too bad.. But your circuit has no impedance matching network ? How it will be improved ?? Check the intrinsic input and output impedances of the CasCode only first then apply proper matching networks to match to source and load.

## How to calculate Envelope Correlation Coefficient (ECC) in HFSS

Hi to all; I want to calculate the envelope correlation coefficient (ECC) for my 2x2 MIMO antenna. I have Simulated the antenna and got quite satisfactory (90%) results s11,s22, S21 or S12. Now I want to Calculate the ECC in HFSS using the S-Parameters. Is there any way to Calculate ECC in HFSS? How ECC can be plotted in HFSS? Please help me

## Simulation of two monopole antenna

Hello, i succed to simulate two monopole antenna in hfss but i dont understand the simulation results because i m beginner in hfss: The difference betwen s11, s22; S21 and S12; RF books will teach you about S-parameter. Guillermo Gonzalez, "Microwave Transistor Amplifiers, Analysis and Design, 2nd. Ed.", Pr

## Why best results of s21 and s11 don't occures in same frequency?

It can happen if you test jig is not calibrated with the Network ANalyzer. Poor quality cables and connectors can add phase shift and losses. Always use semi-rigid coax for better results. The s21 series insertion loss is related to the shunt return loss of both the input and the outputs, so the s11, s22 may have different Series and Parallel reso

## Can we edit dataset Values of dB in ADS2011

Is it possible to change S21 in dB, S12 in dB, s11 in dB, s22 in dB to our own values and generate equivalent Magnitude and Phase Values.Yes, it is possible. Export data as Touchstone, CITI or MDIF format. Then edit text data. And reload modified data.

## HFSS de-embedding probelm

Hi, I am simulating a simple coax in hfss with waveports defined at both the ends. When I change the length, all the S parameters have changed. Theoretically, S12 and S21 should be changed by a factor of exp(j*beta*length) and the s11 and s22 should change by factor of exp(2*j*beta*length). Although the S12 and S21 results are matching accordi

## Validation of simulation with fabricated results by testing with Agilent's VNA

I have completed design of my LNA at 2.1 and 4.6GHz. Thanks to edaboard members for your help. Now I am checking port parameter(s11, s21, s22) with help of Agilent's VNA. But i am not getting notches at desired frequencies. s11 is better at 1.6GHz and s22 is better at 1.2 and 1.6GHz. I have just designed a schematic (...)

## Bandwidth Optimization in Agilent (Keysight) ADS

First you should define equations for each optimization target.For instance let your targets are ?s11?<-15dB, ?s22?<-10dB and ?S21?=15dB. You must define these equations in " Measurement Variable" block being as-for instance Input_return_Loss=dB(S(1,1)) Output_return_Loss=dB(S2,2)) Power_Gain=dB(S(2,1)) Then your have to place a "Goal" block for

## S11 printed antenna CST

What you mean by s22 instead of s11? Make sure your port number first, and when you do simulation (could be transient or frequency) check your port source , whether its 1 or 2!

## How to increase gain

My frequency of operation is 12GHz. I have done DC analysis and obtained Idss = 60mA at Vgs=-1.27V and Vds =2 V. and now m working on S parameters . My target is to increase gain(s21) up to 11 dB ,presently is 4dB. other requiremets are s11:-6 (satisfied) dB S12: -19dB required ,-10 dB received. s22:-11dB (required)

## ADS difference between SP simulation and Transient simulation

It's possible that your circuit oscillates at around 75 GHz and in Transient simulation the circuit's performance is affected by this oscillation. Check your current and voltages and check for beginning s11 and s22 if their magnitudes become positive at around 75 GHz.

## Microstrip LC resonator

Dear all, I am trying to design a series LC resonator with a interdigital capacitor in series with a circular planar inductor. When I simulated the S-parameters in the s11 I get the variation of the inductor and on the s22 the response of the Capacitor, and not the behavior of the resonator I would want. Any idea on what I'm missing? Maybe re

## What is the effect of my finger? Attenuators abnormal !

Where is your design layout and s11, s22 test results? It appears stray leakage is affecting results and finger dielectric shunts low levels to ground depending on standing wave position.

## Input impedance of an SMPS?

Every circuit type of SMPS has a unique input voltage V1(f,t), Z1(f,t) and unique output V2(f,t), Z2(f,t) in s parameters these can either all voltage or current or all impedances where s11 is input and s22 is output for a 2 port device. The forward transfer function is s12 and reverse is s21. Load regulation is due to the ratio of dynamic and

## How to design a filter in MATLAB using the data from an S2P touchstone file

Hi, I have an S2P file of a SAW filter containing S-Parameters s11, S12, S21, s22. I want to use these data to implement the filter in my MATALAB code. Is there something like: d = fdesign.bandpass(.......'S-PARAMETERS extracted from S2P file' ....); Hd = design(d,'.....'); ?????? Thank you very much in advan

## Introduction To Impedance Matching

With matched impedances, Maximum power theorem applies with maximal power loss of reflections called Return Loss. The scattering parameter for a 2 port is s11 & s22 for input and output. Web searches with these key words should show useful results. Although voltage is 50% with matched impedance, power transfer is maxi

## S2p file with just s11 and s22

I have the VNA measured results of s11 and S21 (in ASCII format) of the resonator. Can I edit it to form s2p file and use it for ADS simulation of oscillator? Will the absence of S12 and s22 in the file cause any problem? - - - Updated - - - When I tried the error showed up in ADS : "Error detected while try

## Transistor |s21| less than 1 and still can serve as amplifier?

Of course, provided that s11 and s22 magnitudes are large, and you design a low loss matching network for both. Back in the day, it was COMMON for a S21 magnitude to be pretty poor! We got along somehow.

## finding voltage from hfss s-matrix data output

hi every one, I have simulated a microstrip transmission line in hfss 2013. I got also s parameters. But now i hv to calculate voltages from that. e.g: ihv s11, s12, s21 and s22 thn we know s11=v1-/v1+ my qstn is how to find v1+and v1- from the simulation result. it is a mathematical solution . hope one who knows it'll reply (...)

## why defauly phase of s22 in ADS is 180?

when i use behavior model of ADS, i notice that default phase of s22 is always 180, while that of s11 and s12 is always 0. why ideal phase of s22 is 180, can anyone explain that? thanks.

## How to read S Parameter's graph ?

for example if the s11 and s22 is the same along the frequency, what does it mean ? If the S12 suddenly drop and then rise again in a small range of frequency ,what does it mean ? If the S21 suddenly drop and then rise again in a small range of frequency ,what does it mean ? If S12 is bigger than S21 , what does it mean ? If S21 is bigger than

Dear all, I got a circuit measured for S parameters on Vector Network analyzer. I got 4 different s2p files for s11, S12, s22, S21. is there any possibility that I can combine all the 4 s2p files into a single s2p file for importing on ADS (2 port model) so that I can have all the 4 parameters by importing single file. Also are the VNA s2

## How to draw Smith Chart in Agilent ADS.

In ADS you can plot final return losses s11 or s22 on smith chart ,but not the contour as you do by hand. To study, you add matching sections one by one and see how marker moves as you go along and moves towards the center of chart ,the 50 ohm point.

## help in hfss ..........

Kindly upload the Picture of your schematic & simulation result. since not everyone has HFSS installed. Not receiving required s11 would probably because of improper input matching. what about other S parameters (S21 & s22) are they fine??

## Need comments on my observations on real microstrip series oscillator designs.

Drain stub electrical length = 180+Angle(s11)/2. Actually it is the same as matching phase in this way: Gs=1/s11 Gate stub electrical length = 180+Angle(s22)/2 - Angle(S21). It is more interesting, it gives me exact stub length matched with the photo of of microstrip oscillator in few papers. While using (...)

## Save CST S-parameter data(s11,s12,s21,s22) in one text file.

Hi, i am doing a simulation in CST and I have s11, s21,s12 and s22 data plots. when I export data as text format it only gives frequency and one s-parameter data column. how can I export all s-parameter data to one text file. Thank you

## Drawing stability circles on Smith Chart: how many cases, five?

I want to ask, are there any other cases than that: Output stability: 1) |s11|<1 2) |s11|>1 Input stability: 1) |s22|<1 2) |s22|<1, but Rin>|Cin| 3) |s22|>1 does this inversion rule "but Rin>|Cin| [stable inside circl

## Stability circles calculation from S-params. Error in book or in my calculations?..

Here is example from book: s11=0.70 -57deg S12=0.04 47deg S21=10.5 136deg s22=0.79 -33deg Results from book: k=0.41 |delta|=0.69 Cin=39.04 108deg Rin=38.62 Cout=3.56 70deg Rout=3.03 Mine result: k=0.41 - okay |delta|=0.68 - okay Cin=13.5 106deg <<<<<<<<<<< ??? Rin=13.08 <<<<<<<<<<<< ??? Cout=3.07 68deg <<<<<<<<<<< ??? Rout=2.5

## how find S12 or S21 in a 2 port structure with HFSS?

Hi. I need to find the combined reflection coefficient of a two port structure in hfss.Does somebody has a clue on it? in fact my structure (a copper tube) is fed simultaneously by two lamped ports.I used from coaxial cable for feeding After simulating it somebody can have s11,s22,s21,s12 but these parameters refer to eac

## Scattering matrices being used incorrectly

We found that the vast majority of the literature using scattering matrices in semi-analytical methods (i.e. method of lines, rigorous coupled-wave analysis, eigen-mode expansion, mode matching, etc.) are defining the four terms s11, S12, S21, and s22 incorrectly. It has been convention for many decades that s11 is reflection and S21 is (...)

## I need help to get the desired S-parameter for low noise amplifier

Dear Sir, I designed the biasing for the low noise amplifier at Vds=3v, Ids=20mA, need to get the desired s- parameter as follows f(GHz) s11(dB) S21(dB) S12(dB) s22(dB) 1.3 -1.83312 17.944

## s11 and s22 graph result

You have be a little more specific. s11 and s22 are just input and output impedances. Magnitude plots of each would be return loss. This is how close the impedance is to the S parameter transmission line impedance. -20 db return loss is a close impedance match. It represents a small circle at radius = 0.1 around the center of a Smith chart.

## Processing S-parameter data by using matlab

Hi, I got lot of data in polar form and want to processing by creating a formula/program in matlab. Can anyone give me some advice.I am starter of Matlab. For example , F(x) = / s11 And i have lot of data of s11 ,s22 ,S12 in polar form s11 Magnitude Phase f=0.91GHz 10 120 f=0.92GHz 13

## negative gain in common gate based lna

Hello, I am desining a common gate lna. Just a common gate without any buffer. The CG transistor has inductor at source and drain. Also a resitor is present at drain. I am getting s11 less than 10 db from 2.5G-7GHz, s22 about -6db for the same frequency range, b1f<1, kf>1 but s21 is negative. I have checked the biasing and all dc points? can any

## Calibration of VNA for transmission measurement with the TRM kit

Hi! I want to measure the S21 of a device. i do not need the s11 and s22. should i make the whole TRM calibration, or it is enough to connect just the T (through) kit? Thank you!

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