Fringing Field Capacitance

In summary, the speaker is seeking help with understanding fringing field capacitance, specifically in regards to formulas for varying lengths and shapes. They mention that there is no analytical solution for general shapes and suggest using numerical solutions with an EM simulation code.
  • #1
Dekar
1
0
Hi,

I am having two doubts about the fringing field capacitance.


1) In most of the formulae, the fringing correction for the capacitance is written per unit length. This is ok if the length is very large; and the width and gap between the two conductors are only comparable. But is there any formula, which takes into account the length effect as well? This would be three dimesional fringing field capacitance formula.

2) As the width of the capacitor decreases, the fringing correction is increased. Is there any way to calculate the fringing for a triangular shaped conductor, wherein the width at one end is equal to zero.

I would highly appreciate any help in this regards,

Dekar
India
 
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  • #2
There is no analytical solution for general shapes--numerical solutions using an EM simulation code (HFSS, COMSOL, etc.) are your best bet.
 

What is fringing field capacitance?

Fringing field capacitance is a type of capacitance that occurs in parallel plate capacitors due to the electric field lines extending beyond the edges of the plates. It is also known as stray capacitance.

How does fringing field capacitance affect the overall capacitance of a parallel plate capacitor?

Fringing field capacitance increases the overall capacitance of a parallel plate capacitor. This is because the electric field lines extending beyond the edges of the plates create an additional path for charge storage.

What factors affect the magnitude of fringing field capacitance?

The magnitude of fringing field capacitance is affected by the distance between the plates, the size and shape of the plates, and the dielectric material between the plates. It also increases with a larger area of overlap between the plates.

How is fringing field capacitance calculated?

Fringing field capacitance can be calculated using the formula C = εA/d, where C is the capacitance, ε is the permittivity of the dielectric material, A is the area of overlap between the plates, and d is the distance between the plates.

What are some practical applications of fringing field capacitance?

Fringing field capacitance is commonly used in electronic circuits, particularly in high frequency applications, as it can help to reduce signal loss and improve the performance of the circuit. It is also important to consider in the design of parallel plate capacitors for accurate measurement of capacitance values.

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