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The value provided in the first schematic L=2.7nH, C15=2.0pF, C14=2.7pF, how they will get these values. If I want to design an impedance matching circuit for the same (30+j10) ohm, what process I will follow? it's Related to ESP32 antenna. Sorry for incomplete information. I want, how to design PI- type impedance matching circuits.

  • operating frequency: 2.4 GHz
  • input impedance: (35+j10) ohm
  • output impedance: 50 ohm
user234600
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    I no see schematic – Bart Oct 22 '19 at 11:12
  • Use this: https://www.analog.com/en/design-center/interactive-design-tools/rf-impedance-matching-calculator.html – Bart Oct 22 '19 at 11:12
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    See here (with examples): Chris Bowick, "RF Circuit Design". "Chapter 4: Impedance matching". Section "Three-element matching". Subsection "The Pi Network" (pdf of older edition can be found in web) – Curd Oct 22 '19 at 12:13

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You have three "unknowns" — the three component values.

You have three "knowns" — the operating frequency, the required input impedance and the required output impedance.

You just need to set up the three simultaneous equations and solve them — it's simple algebra.

This paper goes into a lot more detail, including considerations of bandwidth: Improving the Bandwidth of Simple Matching Networks

Dave Tweed
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