I'm creating a Bias-T circuit for a certain application. When choosing my inductor to block my AC-signals I know for example the proper inductance to choose etc. However, what I am having trouble with is choosing one with the proper SRF. How do we choose the SRF value and whats more how do we model this SRF in spice. Thanks!

  • \$\begingroup\$ related \$\endgroup\$ – The Photon Dec 20 '18 at 21:00
  • \$\begingroup\$ Also, Approaching an ideal inductor. \$\endgroup\$ – The Photon Dec 20 '18 at 21:02
  • \$\begingroup\$ You put a whole bunch of inductors in series. Here's some practical advice. wb9jps.com/Gary_Johnson/Bias_Tee_files/Bias_Tee_Design_V2R.pdf \$\endgroup\$ – D Duck Dec 20 '18 at 21:11
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    \$\begingroup\$ Hi guys, I think I figured it out. An ideal inductor acts as a high impedance as frequency goes higher. However, this model doesn't take into account the SRF. At the SRF the impedance goes particularly high and then drops off. Thus, as an AC-blocking component we would want to choose an inductor with an SRF close to the frequency we are working at correct? \$\endgroup\$ – Gordon North Piegan Dec 20 '18 at 22:05
  • \$\begingroup\$ The next question would be choosing the proper capacitor for the frequency I am working at with my antenna. \$\endgroup\$ – Gordon North Piegan Dec 20 '18 at 22:08

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