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25th May 2017, 09:21 #1
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Calculate inductance of a coil in CST
How to calculate the inductance of a coil in CST ? for the attached coil
How to feed the coil in order to get the inductance ?

25th May 2017, 14:24 #2
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Re: Calculate inductance of a coil in CST
It depends what configuration you are interested in, see
http://muehlhaus.com/support/adsapp...uctoremports
If you want 1port data with a lumped port between the ends of the turns, you should include the underpass (bridge), so that you have a clearly defined current path.

25th May 2017, 14:24

7th September 2017, 03:41 #3
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Re: Calculate inductance of a coil in CST
Hye,
If i'm using one port between ends of turns, how to find the inductance of the coil?

7th September 2017, 13:57 #4
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9th September 2017, 09:22 #5
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9th September 2017, 10:02 #6
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Re: Calculate inductance of a coil in CST
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9th September 2017, 13:09 #7
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9th September 2017, 20:25 #8
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Re: Calculate inductance of a coil in CST
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9th September 2017, 20:25

10th September 2017, 13:42 #9
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10th September 2017, 16:34 #10
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Re: Calculate inductance of a coil in CST
I use ADS with Momentum (Method of Moments) as the preferred solver, but FEM works as well.
I never tried the time domain solver for this type of problems. Time domain is a good choice for electrially large models, but inductors are electrically small. If you don't have MoM, I suggest you use the FEM solver.
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11th September 2017, 13:30 #11
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11th September 2017, 16:36 #12
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Re: Calculate inductance of a coil in CST
I don't know what math CST offers you, but I evaluate the L(freq) curve to get the frequency where L changes from positive to negative value.
http://muehlhaus.com/wpcontent/uplo...une_result.png

12th September 2017, 06:15 #13
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Re: Calculate inductance of a coil in CST
http://muehlhaus.com/wpcontent/uplo...une_result.png[/QUOTE]
What software you use to get this results?How to use it?

12th September 2017, 07:36 #14
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Re: Calculate inductance of a coil in CST
This is RFIC Inductor Toolkit for ADS
http://muehlhaus.com/products/rfici...oolkitforads

13th September 2017, 14:51 #15
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13th September 2017, 14:56 #16
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Re: Calculate inductance of a coil in CST
Any empirical formula involves a simplification. As long as Q is high, frequency dependency of inductance is low and can be usually ignored.
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13th September 2017, 14:56

13th September 2017, 15:03 #17
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Re: Calculate inductance of a coil in CST
You need to understand ideal inductors vs. real physical inductors.
Your textbook equation calculates the DC (!) inductance value. At frequencies above DC, there are many influences that change the effective inductance: skin effect will cause a droop (!) in inductance, parasitic capacitances will result in an increase of effective inductance, peaking at SRF where effective inductance goes to infinity.
One comment on FvM: It really depends if the inductor is operating much below SRF. I have been working on EM analysis of PCB inductors and RFIC inductors for many years, and there have been only a few cases like RFID or wireless power transfer where inductance can be assumed constant because operating frequency is much below SRF.
Good luck anyway
VolkerLast edited by volker@muehlhaus; 13th September 2017 at 15:24.
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