On Sun, Oct 6, 2024 at 04:55 AM, §é§Ñ§Ó§Õ§Ñ§â §Ý§Ö§Ó§Ü§à§Ó wrote:
??So I will suggest to Mark to ?do another calc.: ?at resonance frequency ?to move the load point at 90 deg on the side of the loop and ?see the value of this current. ?I have made some very rough model of this receiving loop at resonance point? ( creating e.m. field with a small vertical dipole far away from the loop)? and the current at the loop side is almost 1.5 ?times higher than the current at ?point in the bottom of the loop. ?When the loop is "small" the current must be uniform in any point of the loop.
Chavdar, your rough model seems to be correct.? I obtained the following results:
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Before, when the feed point was at the bottom of the loop, the short circuit current (i.e. the Norton equivalent source current) was only 0.4 dB higher at resonance relative the low frequency current.? With the feed point on the side nearest the incoming wave, it is 4.1 dB higher. ? With the feed point on the side farthest from the incoming wave, it is 3.8 dB higher.? ?Similarly, at 30 MHz, it is 1.5 dB?
higher relative low frequency in both cases whereas before it was only 0.2 dB higher.
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Dan, thanks for running the simulation with your more circular loop.? I will try this experiment with your file and see if it produces similar results.? Your conductor diameter was 25.4mm whereas mine was only 3.3mm, so that might make a difference.
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- Mark
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