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[Local QRM/noise reduction] [Very small vertical magnetic loop]
[Medium size vertical magnetic loop] [Vertical magnetic Alford loop]
[Vertical magnetic loops in real life] [Circular polarization]
[Broadband amplification] [Broadband amplifier] [Single chip amplifier]
[Dual loop antenna system] [Hints]
[Phaser 80 – 10 meters] [Balancing and closed loop antennas]
The very small vertical magnetic loop
In free space
A magnetic loop is called small when the circumference is smaller than 0.1*l.
In that case the polarization in the far field is well known (picture tnx PA3HCD):
Take a good look at the polarization of the far field in each plane. In the YZ-plane it is pure horizontal and in the XY-plane pure vertical polarised. Depending on definition, in the XZ-plane it is also called vertical. On the Y-axis the field is zero !
In free space the very small loop shows a donut shaped field. In every plane with the Y-axis, so also the YZ-plane and YX-plane, the radiation pattern looks like an eight:
Important for QRM reduction is the nulling feature:
Last update: September 24, 2006