1-watt power excitation for each element of the array

Nooshin
Nooshin Altair Community Member
edited January 2023 in Community Q&A

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

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Answers

  • Torben Voigt
    Torben Voigt Altair Community Member
    edited December 2022

    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

  • Nooshin
    Nooshin Altair Community Member
    edited December 2022
    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
    Torben Voigt Altair Community Member
    edited December 2022

    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

  • Nooshin
    Nooshin Altair Community Member
    edited December 2022
    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
    Torben Voigt Altair Community Member
    edited January 2023

    Hi @Nooshin ,

    You will have to subtract the loads in POSTFEKO:

    image

    This way you get the desired reflection coefficients.

    Happy New Year!

    Best regards,
    Torben

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