Matching circuit between antenna and amplifier

[sekharareddy]

Normally Matching circuit in b/n amplifier and Antenna is used to for maximum power transfer from amplifier to anttena.But as per my knowledge, this occurs only when there is an impedance mismatch b/n these two.

In some applications I have seen that even though the Amplifier output impedance and Antenna input impedance both are 50Ω, matching circuit was used.
Can anybody tell me, is it a precautionary measure? or any other thing is also involved ?(apart from impedance matching?)

 

[vfone]

Re: Antenna Matching

There is no need of a matching circuit if both are perfect 50 ohms.
If there is a matching circuit means they are not. Most probably the antenna is not 50 ohms.

I’ve seen a lot of antenna designs which theoretically are 50 ohms (PIFA, Patch) that uses a matching circuit. Is not usual, but if you are under pressure to make it works, there is no choice.

 

[bavamurali]

Antenna Matching

yes according to me perfect transfer of power takes place when there is good matchinng from amplifier to antenna or vice versa

Added after 2 minutes:

generally impedance matching is used to choose for power transfer for eg: transformers are used in speakers (woofers ) for matching in the stereo systems i think the only consideration here also is impedance matching