What do we mean by Two Identical Antennas?

[ayhz2002]

question about antennas

hi:
I have one question:

What do we mean by "Two Identical Antennas"?

Does it mean same gain, radiation pattern, ...etc

Is it a stupid question?

I'm still new to this field.

thanks

ayhz2002

 

[House_Cat]

No question is stupid.

"Identical antennas" depends on the context. If you are talking about an antenna array, then all characteristics should be matched. If you are talking about a transmitter-receiver pair, then the radiation patterns should be matched for best energy transfer.

What context was the phrase used in that prompted your quesiton?

 

[ayhz2002]

thanks

One is receiver and the other is transmitter. They have same polarization and their radiation pattern peaks "look at each other". Both antennas are matched and lossless.


ayhz2002

 

[personal]

antenna

Perhaps, by identical one can compare the typical four antenna parameters, namely, bandwidth, gain, efficiency and beamwidth.

 

[Rayengine]

thanks

One is receiver and the other is transmitter. They have same polarization and their radiation pattern peaks "look at each other". Both antennas are matched and lossless.


ayhz2002

One is for Tx and One is Rx? Why they have the same radiation pattern? Can you advise what application you are talking about ?

 

[Lupin]

"Identical antennas" means antennas designed in the same way (same type of excitation, same materials...), performed in the same technology and so same RF performances.
It's an ideal concept..... two things are ideally never the same...

Regards
Lupin

 

[loucy]

Maybe if the two antennas are identical, there is some easy way to calibrate them or use them for calibration?

 

[dowjones]

yes, measure them and check if the "identical" premise is true. I am now involved on fabrication of antennas which should be identical (same mnfg process and so on), and they never are. Dispersion curves must be generated to check how different they are