what is antenna gain?

[liberal]

what is antenna gain? the power through an antenna is bigger?
if the transmiter power is 0dbm and the antenna gain is 2dbi ,if no other loss ,the receiver power is 2dbm?

 

[flatulent]

The antenna gain is the power out the transmission line from the antenna compared to the power with another antenna. The two basic comparison antennas are a dipole and a fictitious "isotropic" antenna which exists only in the world of mathematics and physics theories.

 

[nhomuathu_hanoi]

The antenna gain is the power out the transmission line from the antenna compared to the power with another antenna. The two basic comparison antennas are a dipole and a fictitious "isotropic" antenna which exists only in the world of mathematics and physics theories

As a supplement, from what I know, the unit for Gain when we have a comparison between proposed antenna and dipole antenna is "dBd" or "dBi" in the case of isotropic antenna.
So,

if the transmiter power is 0dbm and the antenna gain is 2dbi ,if no other loss ,the receiver power is 2dbm?

It's not correct from my opinion.

regards!

 

[sundarmeenakshi]

The antenna gain is the power out the transmission line from the antenna compared to the power with another antenna. The two basic comparison antennas are a dipole and a fictitious "isotropic" antenna which exists only in the world of mathematics and physics theories

As a supplement, from what I know, the unit for Gain when we have a comparison between proposed antenna and dipole antenna is "dBd" or "dBi" in the case of isotropic antenna.
So,

if the transmiter power is 0dbm and the antenna gain is 2dbi ,if no other loss ,the receiver power is 2dbm?

It's not correct from my opinion.

regards!

what is the difference BETwEEn Gain anD EFFECTIVE isotroPIC Radiated poWER

 

[atul_microwaves_antenna]

Hi,
The one more thing is that Antenna dosen't have a active gain.It is a passive gain..and generally we talk in terms of Directivity than Gain.

 

[cr_skyworks]

Usually, the gain of the antenna is not a constant, which depends on the spatial coordinates. The received power should be calculated by Friis transmission equation. It can not be simply calculated just like a power amplifier.

 

[xiaoling1980]

I want to konw how can we see the gain in HFSS,can we know from the 3D polar ?