this post was submitted on 15 Jul 2025
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Science Memes

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[–] fartographer@lemmy.world 42 points 1 week ago (7 children)

Long live the Pringles cantenna

[–] fullsquare@awful.systems 7 points 1 week ago* (last edited 1 week ago) (5 children)

~~pringles can is too small for 2.4ghz cantenna,~~ it's near cutoff frequency but just barely, you need 10cm-ish diameter can or shorter 16cm-ish can

[–] Pencilnoob@lemmy.world 4 points 1 week ago (4 children)

I once made one of these with a bigger can and mounted it on an old 10' satellite dish. Managed to get Wi-Fi across several thousand yards without issue

[–] fullsquare@awful.systems 2 points 1 week ago (1 children)

wait i thought for some reason that pringles can sized waveguide would have cutoff frequency above 2.4ghz. nevermind, there's something better because bigger aperture can get you more directivity like this https://lea.hamradio.si/~s53mv/wumca/cup.html i made two out of cookie tins and it works over 500m at least

[–] Pencilnoob@lemmy.world 3 points 1 week ago (2 children)

We didn't use Pringles, I think it was these big peaches cans

[–] fullsquare@awful.systems 3 points 1 week ago

helical antennas work fine too and look goofy as hell

[–] fullsquare@awful.systems 2 points 1 week ago* (last edited 1 week ago)

i've used the same (800ml can) and this one works well. cookie tin is 15cm dia 8cm tall and it works, but size can vary a bit. you can copy or scale slightly designs of 13cm band antennas

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