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Hi Stefan,
since learning from you how to draw the figures, I have realized how interesting and difficult it is in the field of scientific drawing. The concept of node is really powerful. I need learn and practice it.
Cheers
Ben

Hi Stefan, Thank you very much for your great help and elegant codes.
since no knowledge of style and append after command,
I applied rotate 90 degree within the command of adding capacitors with node command
in order to get horizontal capacitor.

\documentclass[tikz, border=10pt]{standalone ...

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Hi Stefan,
There will be no confusing any longer. We do not need any circuitikz for the sketch.
The only figures I want to draw are a and b, as showed in the first attachment.
Namely, simple double line will be sufficient to illustrate the capacitor.
There is no need to use the package of ...

finally, I know " \draw (45*\i+138:\width cm and 1cm) -- ++(0,-\height); "
for ellipse, therefore, angle: radius1,radius 2

Hi Stefan,
thank you very much for spending time on my question.
I do not understand the following command:
\draw (45*\i+138:\width cm and 1cm) -- ++(0,-\height);
for instance, i=1,
then \draw (183:3cm and 1cm) -- ++ (0,-height)

The definition of polar system: (:r dim), why inside of the ...

Hi, Stefan,
I still have no idea how to make the lines without the method of node.
I can only change the following command

\node [ fill=white, inner sep=1pt] at (capacitor-top\i) {};
\node [circle, draw, fill=white, inner sep=1pt] at (capacitor-bottom\i) {};

which will show ellipse with dashed ...

I found another figure. the circuits ( b and d) I could make it. here I want to show the code.

Thank you very much for your help. I am still learning node and coordinate. I will show my codes later on.
The codes below is for high pass or low pass circuit.
\documentclass[tikz, margin=15px ...

Hi,
I use Texmaker 5.0.2 (latest version Windows 10.
When I write down the code, for instance, \begin{document} , then \end{document} will be automatically filled in. Which version of Texmaker do you use? Good luck.

Hi, I am just beginning to learn Tikz/PGF. However, I have trouble drawing some complicated figures. Is there anyone who can give me some tips?

the geometry of the top eclipse (or circle) is divided by 4 or 8 capacitors (in the symbol as || vertical or horizontal, depends on where it is located ...