what is the meaning of negative antenna gain in dB scale???

[syed_azhar_hasan]

negative db gain

Hi,

I am getting negative gain in result of a simulation in HFSS so please kindly guide what does negative gain means???

 

[zirtapoz]

negative gain antenna

negative gain means, you have positive gain outside the boundries. Depends on your structure try to find another vawe port.

 

[Azulykit]

negative gain in db

Negative gain can indicate that you have an antenna with significant insertion loss. Think of a dipole with an attenuator in series. This is not normally a good thing.

Or you may have done something wrong in the simulation.

 

[mha_mhang]

Re: what is the meaning of negative antenna gain in dB scale

I have the same problem too, especially the directivity? how can a directivity have negative value? Which is impossible in theory. Please can anyone explain it to me?

 

[biff44]

Re: what is the meaning of negative antenna gain in dB scale

A negative gain antenna can be used to bend air. It is very powerful. The trick is to actually build it without losing all of its "negativity".