Capacitance from S21 - parameter without ground influence
时间：04-06
整理：3721RD
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Hello,
I am simulating an inter digital capacitor (*click*) with ADS and am trying to determine it's capacitance from the S parameters.
The structure is simulated on a 1.5mm FR4 substrate with ground plane using the FEM simulator. The FEM simulator requires a ground plane.
Using S11, converting it to Y11 to get the capacitance is not a problem, but using this technique, one half of the structure is connected to ground. This influences the simulation result, because the ground plane is also connected to ground.
I was wondering if I could get the actual capacitance between the two ports, eliminating the groundplane's influence. Can anyone help me?
I am simulating an inter digital capacitor (*click*) with ADS and am trying to determine it's capacitance from the S parameters.
The structure is simulated on a 1.5mm FR4 substrate with ground plane using the FEM simulator. The FEM simulator requires a ground plane.
Using S11, converting it to Y11 to get the capacitance is not a problem, but using this technique, one half of the structure is connected to ground. This influences the simulation result, because the ground plane is also connected to ground.
I was wondering if I could get the actual capacitance between the two ports, eliminating the groundplane's influence. Can anyone help me?
The capacitance between ports 1 and 2 is
C = 1 / ( 2 * pi * FREQ * imag( 1 / Y21 ) )
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