Wiring a magnetic loop antenna...

[Externet]

Hello all.

A magnetic loop antenna used in very wide band 50 to 600MHz reception has two ends. None is ground. A coaxial cable attached to the core on one side and a shield on the other.

At the receptor end; the shield conductor is connected to the front end chassis.

The same loop antenna for reception... If the loop ends are connected to a 'bal' side of a balun and the 'unbal' end of it to the coaxial ending at the RX front end.

What should perform better, without or with a balun ? Which is lossier ?


Loop========================coaxial===================>receiver

Loop+balun===================coaxial===================>receiver

 

[FvM]

Loop diameter is?

--- Updated Sunday at 9:31 AM ---

A small loop can be analyzed as magnetical antenna if the current along the loop is constant, e.g. if D < lambda/20. In this case symmetric or asymmetric drive doesn't affect antenna behaviour much. Larger loops are acting as loop dipole in the first place and without a balun, the feed line becomes part of the radiating structure.

Needless to say that antenna impedance will be far from 50 ohm for most frequencies in both cases.

 

[Externet]

Thank you.
Loop diameter is 32 cm.

Impedance ??? Impedance at what frequency ?

Feed line radiates ? It is a receiving-only antenna.