this post was submitted on 26 Mar 2025
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Science Memes

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40
If u use a SWR meter u vibe checking ur antenna (sh.itjust.works)
submitted 1 year ago by einfach_orangensaft@sh.itjust.works to c/science_memes@mander.xyz
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[–] skillissuer@discuss.tchncs.de 3 points 1 year ago (1 children)

will it antenna? i think it will

split ring resonator has already two different lengths of paths so - even without accounting on how these two interact - you could expect two different frequencies where it's resonant, with peaks perhaps overlapping to a useful degree making a decently wide band possible. it looks a bit like halo antenna with parasitic, downside being that it's probably a bit hard to feed it, circumference has to be halfwave on lowest frequency and if made for HF it'd be gigantic

i think it's more useful to think of magloop as extremely shortened, low impedance, low bandwith halo antenna

[–] einfach_orangensaft@sh.itjust.works 2 points 1 year ago* (last edited 1 year ago) (2 children)

i found a calculator for split rings and one with a outer diameter of 66cm and a trace width of 60mm would resonate at 27MHz and needs about 14pF of capacitance on the split of the gap

[–] skillissuer@discuss.tchncs.de 2 points 1 year ago* (last edited 1 year ago)

this is just small-ish magloop

i've seen some people make magloops out of bike rims, it's similar sized. the smaller it is the lower radiation resistance, higher currents and voltage on capacitor, narrower bandwidth, and lower efficiency. i don't remember how it scales but efficiency goes up fast with size, 1m dia magloop is already better. downside is that tuning becomes impossible on higher bands (capacitance required for this is below minimum capacitance of capacitor that you have)

[–] skillissuer@discuss.tchncs.de 1 points 1 year ago (1 children)

but what if you put another split ring inside it, it'll be different

[–] einfach_orangensaft@sh.itjust.works 1 points 1 year ago (1 children)

i could be wrong but i think the calculator already includes the inner ring https://srrcalculator.blogspot.com/p/calculator.html

[–] skillissuer@discuss.tchncs.de 1 points 1 year ago

okay i see now