I'm not an RF guy so excuse the naive questions. I took an antennas class in grad school and quickly learned that I should not be an RF engineer, but I'm trying to do some back-of-the-envelope calculations.
Assume we have two antennas in free space. One is the transmitter, the other the receiver. I'm curious how much power (in Watts) is transmitted to the receiver.
Let's say we have a high-power amplifier putting out ~100W (Ps) on our transmit antenna with a gain (G) of 40dB. The receiver is 10 meters (R) away, and is assumed to be in the far-field. We can then say that our transmitted power density [S=G*Ps/(4*pi*(R^2))] is 3.18W/m^2
If our effective aperture of our receiving antenna is 0.1W/m^2, and the efficiency is 100%, then we will get 0.318W of power to the receiver.
My questions are 1) have I done this math right and 2) is 0.1W/m^2 of effective aperture realistic for a directional receiving antenna?
Assume we have two antennas in free space. One is the transmitter, the other the receiver. I'm curious how much power (in Watts) is transmitted to the receiver.
Let's say we have a high-power amplifier putting out ~100W (Ps) on our transmit antenna with a gain (G) of 40dB. The receiver is 10 meters (R) away, and is assumed to be in the far-field. We can then say that our transmitted power density [S=G*Ps/(4*pi*(R^2))] is 3.18W/m^2
If our effective aperture of our receiving antenna is 0.1W/m^2, and the efficiency is 100%, then we will get 0.318W of power to the receiver.
My questions are 1) have I done this math right and 2) is 0.1W/m^2 of effective aperture realistic for a directional receiving antenna?