I have simulated an antenna and want to calculate its EIRP, Should i get it from the maximum E-filelds of 3D radiation pattern at diff frequencies, or from the E-filelds of certain direction? If latter, does it mean that the EIRP of antenna is directional?
On the other hand, how can i get EIRP in measurement? from the pulse in time domain? So it will relate to the direction?
Uh, yeah. If you have 1 watt of transmit power at the coax connector, and you connect it to a 30 dB gain antenna, then you have 1 KW of EIRP in the main beam.