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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.