Calculating RF Field Strength (V/M) from Received RF Power (dBm) at 28GHz Frequency

mylogin05 wrote:

how to calculate the rf field strength(v/m) from the received rf power (dBm) at 28GHz- frequency ? what is the equation for it?

The field strength (E) of an RF signal can be calculated from the received power (P) using the following formula:

E = sqrt((30 * P) / (d * π))

Where:

- E is the electric field strength (in volts per meter, V/m)
- P is the received power (in watts, W)
- d is the distance from the source (in meters, m)
- π is a mathematical constant approximately equal to 3.14159

However, you have given the received power in dBm, so we first need to convert it to watts. This can be done using the following formula:

P(W) = 10^(P(dBm)/10) / 1000

Once we have the power in watts, we can substitute it into the formula to find the field strength.

Also, note that this equation assumes that the RF signal is radiating in a free space, and it does not take into account any obstruction or reflection which might be present in a real-world scenario.

Could you please provide the received power in dBm and the distance from the source?

mylogin05 wrote:

You are wrong. The equation you gave is for calculating the field strength at a distance of d from the "transmitted" power. I am looking for the equation to calculate the field strength from the "received" power at the receiving point, not from the transmitted point.

Apologies for the misunderstanding. You're correct. To calculate the electric field strength (E) from the received power (Pr), you can use the following equation:

E = sqrt((30 * Pr) / Z)

where:
- E is the electric field strength in V/m,
- Pr is the received power in watts (W),
- Z is the impedance of free space, approximately 377 ohms.

However, since you provided the received power in dBm, you must first convert it to watts using the conversion formula:

Pr(W) = 10^(Pr(dBm)/10) / 1000

Once you have the power in watts, you can then substitute it into the field strength formula.

Please note that this equation also assumes a free space environment and does not account for factors such as reflection, scattering, or diffraction that may occur in a real-world situation.

Could you please provide the received power in dBm for further calculations?