Quarter Wave Antenna - Collin’s Lab Notes #adafruit #collinslabnotes

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Create a super simple monopole antenna for your radio transceiver.
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Комментарии
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Love the Collin video’s! Please keep them coming!

segwaydave
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if the antenna wire is longer, will it not work?
what are the ramifications of an incorrect antenna size - either too short or too long?

zenmaster
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I thought a quarter-wave antenna needed a ground-plane reflector.

banas
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Finally someone who explains it in a simple way!!!

billyjoe
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For real? Doesn't it need to be coiled?

PabloAntOyarzo
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Dont use 300, 000 use 299, 792, 458, but even this isnt perfect. 299, 792, 458 is the speed of light but since you are going through wire the speed actually slows due to the velocity factor. 300, 000 is ok to use for back of a napkin maths, but accurate maths is much better for antenna making for performance, especially UHF and above because the waves are smaller and smaller giving less margin of error in optimal (or tollerable) antenna construction.

If the anteena is cut very close to resonance there reflected sognal will be negligible, and therefore less is wasted ineffectively. The further the antenna is from optimal there is a sharp decline in performance and much of the RF is reflected back to the board. If using components at or near to their spec power rating you can find them being damaged (although i doubt a small board like an Esp32 or an RP2040 is a concern).

dennis