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# s11 s21

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264 Threads found on edaboard.com: s11 s21

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

## Calculate loss using s parameters

Hi guys,I have a question regarding to the s parameters, for lossless system s11^2+s21^2=1. Does it mean for a system with loss s11^2+s21^2+loss=1? If so, could you give a source of this equation? Because I insert some Si waveguides in the CPW and want to find the power dissipated on them.(Si waveguides are buried in an (...)

## Transmission impedance from two port S-parameter for a Diode

When using one port S-parameter measurement, Z is calculated by transforming the s11 to Z for a specific working point and frequency. Is it correct to transfer the S12 or s21 (which are (almost) identical by a Diode) to Z to get the impedance of the device? If you have a working diode, s21 and s12 should be qu

## 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}

## [HFSS] Calculate the loss inside the waveguide

You'd find loss as 1-|s11|^2-|s21|^2. Yes, this will get you the total loss of the mode. If you're just looking at the fraction of the loss inside of the silicon layer, you could manually computer the scattering (integrate incident and reflected powers) over a sheet that jsut covers the ends of the silicon.

## what analysis I can do for amplier design project?

check the stability of the amplifier after design, do the matching stuff and then do s-parameter analysis and try to plot s21 and s11.

## HFSS: Calculate the absorption in each layer

Hi, I am trying to obtain the Transmittance and Reflection of entire structure and absorption in terms of percentage in each material layer. The information currently I have is the reflection and transmission coefficient obtained from s11 and s21. Is there any good function in calculator to do so? Initially, I tried to use Volume_loss_density f

## 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-

## Impulse response h(t) of UWB antenna from S11 parameter

s11 can only give reflected pulse shape (by applying fourier transform), For transmitted/received pulse response you need s21 measurement.

## [Moved]: S11 to s41 plots for hybrid coupler

GOOD DAY ALL, CAN SOME ONE PLEASE HELP ME ON HOW TO PLOT THE THEORETICAL GRAPH OF s11 = return loss, s21 = through port, S31 = coupled port, S41 = isolation port FOR A HYBRID COUPLER? MANY THANKS

## S11 , S21 and Gain relationship ??

Hi guys, Can we write this for a certain block like LNA ? s21 = (1+s11) vout /Vin IF yes, where is it coming from ?

## 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

## Frequency selective surafces

The S parameter results are Szmin and Szmax, but really i cant know which are the RL. and which are TL. Can any one help me or explain Szmin, Szmax? Zmin and Zmax are your port locations. As an example, assuming Zmax is port 1 and Zmin port 2, SZmax(a),Zmax(a) corresponds to s11. s21 would then be SZmin(a),Zmax(a).

## VNA S Parameters Measurements - Insertion and Return loss

s11_dB=20*log10(abs(s11)) s21_dB=20*log10(abs(s21)) RL=-s11_dB IL=-s21_dB So RL=22.14dB, IL=14.24dB

## 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) (...)

## 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

## Insertion loss 0 db and return loss negative dB in low freq

Hello, I simulated a four port board which is 0-5 GHz range. I compared my simulation result with the measurement. I got insertion loss (s21) is 0 dB and return loss (s11) is a very large negative dB value at low frequency (0 Hz). I found this is the characteristics of s21 and s11. But I do not know why this happens. Could (...)

## How to get (MCFIL ) Coupler Microstrip With S11 = 0 and S21 =-10db

Hello, i am designing using MCFIL component for microstrip sensor. but my s11 still 0.8 above approaching 1 . i am doing my final year project so i really really really need help here. Thanks in advance.

## How can i simulate a perfect waveguide with no reflections (S11) in CST ?

its really new for me but i can try to answer. s11=b1/a1 when a2= 0. a2= reflected wave from port 2. so you have terminate the other port with perfect 50ohm/correct impedance in order to get ideal reflection is s11=0.

## 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

## Convert S11 INTO S21 graph for filter passband sweeps?

Yes, "in case of lossless filter". Unfortunately ALL the filters have loss and ripple, and the s11 cannot give any information about these parameters. And I have doubts that give accurate information about out-of-band rejection either.

## s21 and s12 parameter in lna

input and output return loss (s11 and S22) tells you how much energy reflected back from the load. so it has to be as low as possible and surely < 0dB as planar metamaterials said. typical value wil be < -12dB. s21 is you LNA gain. it has to be higher and typically can vary from 8dB to higher depending upon device used. S12 is isolation/reverse g

## 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; i would like to visualise the horizontaal Gain so i clik in create far field report ;radiation patern but i found this fig123692 b

## Nicolson Ross Weir (NRW) method, CST data calculations using matlab

Dear all, i have CST data for S-parameters (s11 and s21) and i want to calculate for complex permittivity and permeability on matlab using NRW. I tried several times but is not giving me the exact result. I went through several materials but my code doesn't work still. kindly help me out

## 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

## Graph S21 and S11 - Pin Specification...

I have a PCB(test bench), which has "contacting device"(Socket) to holds the ICs(without soldering). The "contacting device"(Socket) consists from "pins". Effect of these "pins" I want to consider when simulating PCB in ADS. I have a graphics s21 and s11. And Self Capacitance of pin: 0,47 pF Self Inductance of pin: 1.44 nH I have not foun

## 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.

## 20 GHz split Ring Resonator loaded at CPW

Split Ring Resonator (at 20 GHz) loaded with CPW (Coplanar Waveguide) with pitch size (of GSG probe) 0.15 mm! 50 Ohm impedance of CPW was matched, but after loading SRR no resonance occurred. s11 and s21 curves are appearing totally flat. I loaded CSRR also, and changed different parameters but it seems coupling is not occurring (one pos

## 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 (...)

## query on waveguide simulation in cst microwave studio.

Hi, can anybody tell me why s11 and s21 show similar variation for a waveguide below cut off frequency of the waveguide? I am getting required operation above the cut off frequency, but below the cut off frequency i am getting positive values for s11 and s21 as the frequency approaches the cut off. thanking in advance.

## 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 in AWR's MWO with (...)

## Why tweaking filter makes S11 change while S21 is constant?

I can't understand how s11 can be constant, while s21 changes (in software simulation). For example, same filter with small adjustment in configuration: configuration1: s21=-2.5dB, s11=-11dB configuration2: s21=-2.5dB, s11=-17dB If i use real measurements with network analyzer, would (...)

## How to Calculate RCS USing HFSS???

Hi all; I have designed an FSS for band stop applications successfully using HFSS version 15. Now i want to calculate RCS of the same FSS. Is it possible to calculate? If it is possible then please tell me how we can calculate it in HFSS. Is there any formula for RCS calculation using S-parameters (s11, s21 etc.):???::???::???: With Best

## S11 & S21 in LTSPICE

Hi guys, Can LTSPICE find S-parameter for circuit? I don't see any enough information on this. I'm trying to extract s11 & s21 of LNA for GSM and I hope LTSPICE can do that.

## Metamaterials: imaginary part of permittivity being negative

Hello dear friends, I'm working on a new metamaterial structure that have nonlinear properties with in a broad bandwidth. I have simulated the structure in cst and got the s11 and s21 of the structure. with the relations given in the articles calculated permittivity and permeability of the structure. but there is an amazing point in the result and

## 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

## Extract Noise Parameters from S2P FILE

To do this noise extraction, the S2P file should include the Fmin (and Gamma_opt and Rn), as in the example below. Not all the vendor S2P files includes those parameters, which sometime must be measured by the customer. ! NE3503M04 ! N-channel HJ-FET ! Vds = 2 V Id = 7 mA # GHz S MA R 50 ! f s11 s21

## Passband Substrate Integrated Waveguide filter on CST

Hello I want to simulate one cavity of a SIW passband filter i'm using CST mws but it doesn't work i have this a message Could not compute matrix factorization I don't know what is the problem (the structure,exitation,...????) I tried to simulate one cavity( To see (s11 s21) of a pssband filter without to modeling the ca

## microstrip filter design

One solution is to run the feed line separately with a 50 ohm lumped port or wave port at each end of the line. Use parametric analysis by changing the length of the line, from the resultant s11/s21 you can estimate the good length of the feed line which gives s11 < -20 dB and s21 > -0.5 dB in the interested bandwidth ..... (...)

## S-parameters from just S11

Not sure what you question is. For a 1-port measurement, the complete S-parameter results are . For more ports you get a larger S matrix. If you want s21 etc of course you need two or more ports. Z-parameter output can be enabled in the S-parameter block. obrazki.el

## i have designed lna in agilent ads software.but in output i am getting s21 =(-105 dB)

i have designed lna in agilent ads software.but in output i am getting s21 =(-105 dB) and s11=(-0.05 dB).how to analyze these center frequency is 5.8 ghz

## HFSS How to get the S parameters from a finite structure using Plane Wave

Hi humFdz, Some more details are required to be of assistance. Are you integrating over the entire incident wave with the planes? To calculate S parameters, are you using s11 = 10*log10(Scattered_1/Incident_1) s21 = 10*log10(Total_2/Incident_1) Are you integrating the normal component of the real Poynting vector only?

## 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)

## CST SRR simulation problem

Hello everybody:smile: I'm new in using CST I'm facing a problem of a frequency shift in the results of s11 and s21 of the simulation of rectangular SRR there is always about 250 Mhz shift actually i always facing a problem in defining the dimensions of the vacuum space around the model and the dimension of the waveguide port. could any bod

## Energy and Balance in CST Mirowave Studio

Balance express the power loss vs. frequency in a structure or through radition for a given excited port. In a case of a loss-less structure the balance = 1: e.g. Port 1: Balance(1)=sqrt(|s11|^2+|s21|^2). The energy view express the field energy in the system.

## Significance of S21 plot in Smith chart

Hi, What is the significance of plotting s21 in Smith chart? I know that it plots normalized (s21-Z0)/(s21+Z0), what is its significance? Plotting s11 makes sense because in that case it represents reflection co-efficient and hence it is helpful in matching etc. But why s21?

## Help me make sense of S-parameters - 3 antenna ports

Reference thread Hi, I'm actually trying to do something very similar. I simultaneously exciting 3 discrete dipole antenna ports. However I cant seem to make any sense out of the S-parameters I get. Instead of the generic S-parameters (s11, S12, s21, ..... ) I get these : S1,S

## Significance of S11 for resonator in oscillator circuit

While designing a feedback oscillator with resonator in the feedback loop, is s11 of the individual resonator important? Or should we be looking for a better s21 only or both s21 and s11 while designing the resonator individually?