Hello
I am uding the WEBENCH LDC1000 for designing PCB coil. A question is that the result of Free Field Frequency does not match the Fres=1/(2pi * sqrt(L*C)).
It can be simulated as the following procedure.
1) Use defulat setting at WEBENCH LDC1000 menu
Distance=1.5cm, resolution=20um, Dia of Target=10cm, Traget Material=Stainless (SS416),
and hit Open Design
2) The WEBENCH shows 20 solutions.
Free Field Inductance (uH) and External Capacitor (pF) do not match between Free Field Frequency (MHz) with the manual calculation ( 1/(2pi * sqrt(L*C)) in PCB inductor coil #3, and #11 through #20.
For example, PCB inductor coil 20 (the bottom of 20 soultions) indictaes 84.32uH, 60.07pF and 5000000Hz but my hand calculation was 2236279Hz.
I tried other paramters and saw similar missmatches. Am I something wrong on calculation?
Best regards,
Masa Katayama
