The unshielded coupling loop is likely to produce the lowest losses.
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When using a toroid, especially on the lower frequency bands, a high permeability core material is required. These tend to be lossy, in addition, core saturation can also occur. This is because a small diameter core is required to achieve adequate coupling to the loop structure, and this in turn means that a very small core cross-section is carrying the majority of the flux.
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Regards,
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Martin
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On Sun, Apr 27, 2025 at 09:05 AM, V¨ªctor J. S¨¢nchez wrote:
At first I'll made an unshielded coupling loop so it's the easiest method althougt the toroid is an excellent alternative too.
