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Inductor and radio module

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r4r:
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.

iMo:
The basic rule is to have the antenna placed at least lambda/4 off any conductive or feromagnetic part (lambda is the wavelength).

radiolistener:
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.

r4r:
Thanks, guys!

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

Zero999:

--- Quote from: r4r on April 26, 2019, 08:26:30 pm ---Thanks, guys!

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

--- End quote ---
But it absorbs or reflects radiation around the antenna, which will affect its performance.

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