I'm new here, and the first question I'm asking is the following:

I use "RF Circuit Design" by Chris Bowick to design rf filters. It happens that the calculations turn out impossible values, like capacitors of less than 1pF or inductors of less than 1nH, in other words, values that can hardly be realized in the real world.

What should best be done about it? To build it these values must either be downsized to 0 or be sized up to the next possible value. How to do that?

Thanks for your help.

Kind regards

Martin