# Total Radiated power (TRP) equation

1. ## Total Radiated power (TRP) equation

Hello all,

I wanted some clarification regarding the addition used in the discrete form of the TRP equation (used in anechoic chambers, see image below).

I think it should be, althogh the equation representation does not look like a vector addition.
As much as I understnd, the addition should be : SQRT(EIRP(THETA)^2+EIRP(PHI)^2).

•

2. ## Re: Total Radiated power (TRP) equation

Found this:
"In practice, the total EIRP will likely be measured at each sample point by measuring its two
orthogonally polarized components, EIRPθ (θ , φ) and EIRPφ (θ , φ). To accommodate this
measurement practicality, we can split the radiation intensity at each angle into two
contributions, one from each polarization (power in independent components simply adds)"

•

Good.

Regards
Rotmanlens

•

4. ## Re: Total Radiated power (TRP) equation

Yes, I waited but no one answered. but still there is a question, why?
To the best of my knowledge the E field is a vector which is projected on to the two orthogonal θ and φ axis.
So, if this is the case the vector addition of this two projection will give the total E field and not a scalar addition of them.

5. ## Re: Total Radiated power (TRP) equation

Found the answer. vector addition is really needed for the E field, but it can be shown that the power is a scalar addition of each component of the E field.

--[[ ]]--