Converting a circuit with capacitors and inductors to a circuit with Microstrip Lines

f_t said:

Friends,

I want to convert my circuit which has designed by capacitors and inductors to a circuit without any capacitors and inductors. I mean I want to use only microstrip lines. Could you please help me to do that?
I know that after I gain Electrical Lenght (Beta*x) and Z0, I can convert them by LineCalc in ADS to Mlines, but before it, how I should convert capacitors and inductors to Z0 and Electrical Lenght? I know there is an equation for finding amount of short circuit and open circuit lines to find inductance and capacitance, but should I just use it? It does not any change or adding something else?

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jiripolivka said:

To understand the conversion please read about the Smith Chart. If you learn to understand it, then you can replace L and C by transmission lines, also by microstrip.

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FvM said:

It's no reasonable approach to replace L and C by transmission line stubs one by one.

You can most likely achieve the purpose of the discrete LC circuit (impedance matching, filtering) by transmission line segments if you know the specification and the transistor S parameters.

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FvM said:

For biasing you can use a λ/4 stub replacing L2/C5. And compensate for transistor output impedance by tuning the line length.

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Ok, but c4 and L2 are needed for the structure of a Class-E power amplifier and I cannot remove them.

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