1-watt power excitation for each element of the array

Noocheen

Hello administrator,

I have an array antenna (5by5 element). I drew it manually without using array option in feko. I want to see is there any possibility to assign 1 watt power to each element instead of having 1 watt power for whole array?

Kind regards,

Nooshin

Torben Voigt

Hi @Nooshin ,

I would try to make sure that voltage and current remain approximately constant over the entire frequency range, so that you can determine the power at each port using P = 0.5*U*I. If you put a high impedance in series on each port in addition to the voltage source, you will have a quasi-constant current and can then determine the voltage with V = sqrt(2*P*R).

In the attached example, each of the 25 ports has a 1 MOhm load and a voltage source with V = sqrt(2*P*R) = 1414,213 V. This results in approximately 1 W of power at each port.

Does this help you?

Best regards,
Torben

Noocheen

Torben Voigt_20420 said:

Hi @Nooshin ,

I would try to make sure that voltage and current remain approximately constant over the entire frequency range, so that you can determine the power at each port using P = 0.5*U*I. If you put a high impedance in series on each port in addition to the voltage source, you will have a quasi-constant current and can then determine the voltage with V = sqrt(2*P*R).

In the attached example, each of the 25 ports has a 1 MOhm load and a voltage source with V = sqrt(2*P*R) = 1414,213 V. This results in approximately 1 W of power at each port.

Does this help you?

Best regards,
Torben

Hi Torben,

Thank you for your reply. Unfortunately, I couldn't open the attached file. My Feko version is 2021.2, would you please change the file to this version?

Since I couldn't see this file, I am unsure whether I understood your idea. if I add a high impedance in series on each port, it affects my input impedance, doesn't it? Unless I put it in parallel. 

I think I need to see your file first and make a judgment.

Thank you so much for your time and help!

Regards,

Nooshin

Torben Voigt

Hi @Nooshin ,

I don't have Feko 2021.2 installed. The oldest version I have is Feko 2021.2.4.

You may run the attached script in CADFEKO to create the array.

Have fun!

Best regards,
Torben

Noocheen

Torben Voigt_20420 said:

Hi @Nooshin ,

I don't have Feko 2021.2 installed. The oldest version I have is Feko 2021.2.4.

You may run the attached script in CADFEKO to create the array.

Have fun!

Best regards,
Torben

Hi Torben,

Thank you for the script.

I checked your file and I ran it. Although it gives 1-watt power for each element, the reflection coefficient is 1 at 1 GHz. So, these loads affect the reflection coefficient which is not good.

Do you have any other idea for having 1watt power on each element?

Regards,

Nooshin

Torben Voigt

Hi @Nooshin ,

You will have to subtract the loads in POSTFEKO:

This way you get the desired reflection coefficients.

Happy New Year!

Best regards,
Torben