| Electronics > Beginners |
| 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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