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Georgia Journal of Science

Article Title

GAP CAPACITANCE VERSUS INTERDIGITAL CAPACITANCE

Abstract

Gap capacitance and Interdigital capacitance (IDC) are widely used in microwave circuits and devices because of their planar structure and simple construction. A gap capacitor is model as a simple π type electrical circuit composed of series – parallel combination of capacitances only whereas an IDC can be considered as a complex π type electrical circuit composed of series – parallel combination of capacitances and inductances both. Obviously both types of capacitance values vary with different parameters such as gap between two metallization, finger length, and spacing between two fingers and so on. In this research, a parametric study is conducted for both type of capacitance using with 3D electromagnetic simulation software HFSS. Simulation result shows that IDC values are 100 to 1000 times bigger than simple gap capacitance at the cost of space consideration.

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