Equivalent Inductance and Capacitance of a Microstrip Slot

Slots cut in the upper conductor of a microstrip transmission line have been used to match microwave components such as couplers and filters. Their equivalent circuit, which must be known in order to design devices involving such discontinuities, is composed of a series inductance and of capacitances. These elements are determined, in terms of the geometrical parameters, by means of a quasistatic analysis, assuming TEM-mode propagation on a lossless line.