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[Antenna][Drawing tip requested] Stacking 2 spiral inductors for enhacing inductance

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chromatik

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Hi,

I am just asking myself if it is possible to stack 2 planar circular spiral inductors, with respect of the current direction, and with the minimum overlay.
If I start from the outside of the first coil to the center, and switch from this first coil to the other, the current flows the opposite direction, so I guess the inductor will suffer for this problem?

Do you have some advices ?
Thanks for your help
Regards

Chromatic
 

chromatik said:
If I start from the outside of the first coil to the center, and switch from this first coil to the other, the current flows the opposite direction
Click to expand...

Draw the inductor so that turns on both layers follow the same direction.

18_1315142886.jpg
 

hi
i think this work not useful for antenna dont try it
 

thats true it can work for narrow band application but it too expensive for RFID
 

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