CST-Microwave studio - need help calculating power

[smrity]

cst microwave studio s21 s11

hi!
anyone help me for calculating power transmitted and power loss from CST-MICROWAVE STUDIO for any specific mode.

 

[ravi8331]

Re: CST-Microwave studio

.............
you have cylindrical waveguide - so you have one port on the one side and second port on the second side - after calculate, you have S21, S11, S12 and S22 (S21=S12 and S11 = S22). This is your transmitted and return loss.

If you want to get loss about the power, you can calculate:

Transmitted Power (dBm)=Input Power(dBm)-|S21|(dB).

If you want to get loss about Watt, you can Input Power(Watt)-Transmitted Power (Watt)

If you want to get loss about the power, you can calculate:
Transmitted Power (dBm)=Input Power(dBm)-|S21|(dB).
If you want to get loss about Watt, you can Input Power(Watt)-Transmitted Power (Watt)

Added after 8 minutes:

The power will be reflected, transmitted and loss.
1-S11*S11 represent the power except reflection loss.
If waveguide does no has loss, S21*S21=1-S11*S11. However, practical waveguide has loss, 1-S11*S11-S21*S21 represent transmission loss

 

[smrity]

Re: CST-Microwave studio

.............
you have cylindrical waveguide - so you have one port on the one side and second port on the second side - after calculate, you have S21, S11, S12 and S22 (S21=S12 and S11 = S22). This is your transmitted and return loss.

If you want to get loss about the power, you can calculate:

Transmitted Power (dBm)=Input Power(dBm)-|S21|(dB).

If you want to get loss about Watt, you can Input Power(Watt)-Transmitted Power (Watt)

If you want to get loss about the power, you can calculate:
Transmitted Power (dBm)=Input Power(dBm)-|S21|(dB).
If you want to get loss about Watt, you can Input Power(Watt)-Transmitted Power (Watt)

Added after 8 minutes:

The power will be reflected, transmitted and loss.
1-S11*S11 represent the power except reflection loss.
If waveguide does no has loss, S21*S21=1-S11*S11. However, practical waveguide has loss, 1-S11*S11-S21*S21 represent transmission loss

thanks ravi

 

[kaandee]

hi ravi8331
I have to calculate imput impedance of spiral antenna.
Do u know how to find S11 in CST for specific reference impedance

i mean
S11 = Z - Z0/ Z+Z0
from this equation we can find Z (input impedance of spiral antenna), Z0 = 50 ohm (feed line impedance).
so i need S11 to calculate Z.
How we can find S11 from CST MWS. it has magnitute and phase.
plz help me as soon as possible.

thank you

 

[MobiNaz]

Hello,

Convert your S11 to real and imaginary component.. Real +j Imajinary and then solve accordingly.

Thanks