Appendix A.Example of a solenoid design

Radio Frequency Circuit Design. W. Alan Davis, Krishna Agarwal

Copyright 2001 John Wiley & Sons, Inc.

Print ISBN 0-471-35052-4 Electronic ISBN 0-471-20068-9

APPENDIX A

Example of a Solenoid Design

The design of a solenoid inductor was described in Chapter 2. An example for a 100 nH solenoid design at 200 MHz is shown below using the program SOLENOID where the bold type indicates user inputs. After initial values for the solenoid are given, the form length and number of integral turns are modified, but the form diameter remains unchanged. The interwire capacitance, C, the self-resonant frequency, Fres, and the Q are calculated.

Frequency in Hz for Q calculation = 200.E6 Geometry -> Inductance, type <G>

Inductance -> n, the number of turns, type <L>

L

Desired inductance, L (H), initial form Length, Form Diameter - inches, Initial value for no. turns

100.E-9, 0.5, 0.1, 20

Number of turns = 13.00000

AWG = 21.0 Wire Diameter = 0.284625E-01 Final Length = 0.576708E + 00 in.

Pitch = 0.44362E-01 Wire Diameter = 0.28462E-01 in. Turn Diameter = 0.12846E+00 in. Form Diameter

= 0.10000E+00 in. L = 0.10002E+00 H

C = 0.203350E+00 pF Fres = 0.111600E+04 MHz Q = 0.649760E+02 at F = 0.200000E+03 MHz

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