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This is a spst switch working on 2.4 GHz. I want to replace the inductor and capacitors with microstrip line. What is the easy way to do that?

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  • \$\begingroup\$ How wide a band around 2.4 GHz are you using? Which inductors and which capacitors do you want to replace? \$\endgroup\$
    – The Photon
    Jun 6, 2021 at 16:48
  • \$\begingroup\$ Its a switch. When it is on it will pass frequencies from 2.2 to 2.6 Ghz. I want to replace all the capacitors and inductors of the circuit. \$\endgroup\$
    – sajib sn
    Jun 7, 2021 at 13:54

1 Answer 1

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2.4 GHz is a fairly low frequency when it comes to trying to make useful L or C-equivalents with microstrip structures.

But instead of trying to make direct equivalents, you could consider some other options that will achieve the required functionality.

  • Instead of capacitors C19 and C20, you could make a directional coupler structure that blocks DC while passing your 2.4 GHz signal.

  • Instead of L13, you can work out what length of shorted stub line produces a high impedance at its input at 2.4 GHz.

  • You could do the same for L14, but you'll have to be careful how you terminate it.

You probably can't generate 220 nF of capacitance in a practical microstrip structure to replace C21. But you might be able to find a parallel combination of discrete capacitors that provides low impedance over your signal band, in order to terminate the stub line you're using to replace L14.

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