Issues with getting capacitance using Interdigitalcapacitor both capacitance value and RF values.

When runnign the following commands:

capacitor = interdigitalCapacitor(NumFingers=5,FingerLength=4500e-6,FingerWidth=332e-6,FingerSpacing=206e-6,FingerEdgeGap = 87e-6,TerminalStripWidth=330e-6,PortLineWidth=8000e-6,PortLineLength=pll,Height=20e-6,GroundPlaneWidth=1,Conductor=capacitor.Conductor)

capacitance(capacitor,10e9)

I do not get any values for the capcitance - not DC or RF..

Also, when i run it MATLAB window does not pruce any resuta and i cannot "stop" the run and have to kill the matlab process.

Answer 1

[Sayan]

Hi Alkim Akyurtlu,

The "PortLineLength" and the "Conductor" properties are not properly defined in your "interdigitalCapacitor" object.

• "PortLineLength" is assigned to "pll" which is not defined. It should be assigned with a scalar value.
• "Conductor" should a "metal" object. However, it is assigned as "capacitor.Conductor" which is not a valid metal object.

You can refer to the following code snippet with modified values of "PortLineLength" and "Conductor".

%creating a conductor of 'copper'
m = metal('copper'); 
%Setting the "PortLineLength" to "0.01" and "Conductor" to "m"
capacitor = interdigitalCapacitor(NumFingers=5,FingerLength=4500e-6,FingerWidth=332e-6,FingerSpacing=206e-6,FingerEdgeGap = 87e-6,TerminalStripWidth=330e-6,PortLineWidth=8000e-6,PortLineLength=0.01,Height=20e-6,GroundPlaneWidth=1,Conductor=m);
capacitance(capacitor,10e9);

This runs for me and I get the following output.

You can further refer to the following documentation to know more on "interdigitalCapacitor".

https://www.mathworks.com/help/rfpcb/ref/interdigitalcapacitor.html

Hope this helps in resolving the issue.