Field strength and Power

Song Tiandi
Song Tiandi Altair Community Member
edited September 2023 in Community Q&A

i can simulate a scenario with a sender and a predicttion point in winprop proman. For the same prediction point i can get power and Field strength. It seems that they have a constant difference and frequency depedent. The results showned in the pictures is simulated with a anttena frequency of 2000MHz. What is the relationship between Fieldstrength(dBuV/m) and Power(dBm)? how are they calculated? 

Thanks for your answer!

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Answers

  • reinerh
    reinerh
    Altair Employee
    edited August 2023

    The general formula (ignoring the Rx antenna gain, i.e. assuming isotropic receiving antenna) is:

    Rx power [dBm] = e [dBuV/m] – 77.21 – 20*log(f/MHz)

  • Song Tiandi
    Song Tiandi Altair Community Member
    edited September 2023
    reinerh said:

    The general formula (ignoring the Rx antenna gain, i.e. assuming isotropic receiving antenna) is:

    Rx power [dBm] = e [dBuV/m] – 77.21 – 20*log(f/MHz)

    Thank you for the reply. It's really useful. But may I know what is the calculation behind 77.21? 

  • reinerh
    reinerh
    Altair Employee
    edited September 2023

    Please find attached a document explaining the calculation.

  • Song Tiandi
    Song Tiandi Altair Community Member
    edited September 2023
    reinerh said:

    Please find attached a document explaining the calculation.

    Thank you so much! It's really helpful.

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