Author Topic: Inductor and radio module  (Read 817 times)

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Offline r4rTopic starter

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Inductor and radio module
« on: April 25, 2019, 09:03:38 pm »
Hi everyone!

Nice to be here!

I'm very junior in PCB design and circuitry. In my first project I've placed shielded inductor (10uH - part of buck dc-dc converter) right next to SIM800L GSM module antenna. Is it acceptable?

Thanks.
 

Online iMo

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Re: Inductor and radio module
« Reply #1 on: April 25, 2019, 09:37:59 pm »
The basic rule is to have the antenna placed at least lambda/4 off any conductive or feromagnetic part (lambda is the wavelength).
« Last Edit: April 25, 2019, 09:40:58 pm by imo »
Readers discretion is advised..
 

Offline radiolistener

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Re: Inductor and radio module
« Reply #2 on: April 25, 2019, 10:34:32 pm »
if antenna loss is not important for you, it is acceptable.

If it is important, then place your antenna at the distance not less than R = 2 * D^2 / lambda, but for very short antennas not less than R = lambda / (2 * pi). Where D is antenna maximum dimension size. Usually minimum distance is about lambda / 2, but it may depends on antenna size.
 

Offline r4rTopic starter

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Re: Inductor and radio module
« Reply #3 on: April 26, 2019, 08:26:30 pm »
Thanks, guys!

If I get it right, shielded inductor doesn't emits radio interfering?
 

Offline Zero999

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Re: Inductor and radio module
« Reply #4 on: April 27, 2019, 09:27:53 pm »
Thanks, guys!

If I get it right, shielded inductor doesn't emits radio interfering?
But it absorbs or reflects radiation around the antenna, which will affect its performance.
 


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