| APPLICATION NOTE USM 115 A set of approximation techniques and handbook methods for air-core structures |
Author: Mihaela Radulescu,
M Phys. Sc. member technical staff, SEMICONIX CORPORATION |
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| 1.Straight
conductor l=length R=wire radius |
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| 2.Circular
loop of round wire a=loop radius R=wire radius |
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| 3.Parallel-wire line l=wire length d=distance between wire; l>d |
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| 4.Square loop D=side length 2w=trace width b=wire depth; w<<D; b<<D |
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| 5.Rectangle of round wire x,y=rectangle side lenght |
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| 6.Poligon of round wire p=perimeter A=area |
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| 7.Disk coil with rectangular
cross section a=radius b=axial thickness c=trace width |
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 P and F = unitless constants F=1 for b<<c, c<<a P=f(c/2a) |
| 8."Brooks" Coil 2a/c=3 b=c |
N= number of turns |  |
| 9.Finite-length solenoid a=radius l=length; |
l>0.8a l<a N=number of turns ; K=constant |
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| 10.Round planar spirals a=mean coil diameter P=factor depending on c/2a c=thickness of winding N=number of turns |
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| 11.Planar square coil N=number of turns |
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 for Di=0 |