Abstract:

The capacitance of the Leaky Coaxial Cable (LCX) with eight-shaped slot is calculated by the Three-Dimensional Finite Difference Method.The differential equation of electrical potential in the Closed segment and Slotted segment of the LCX is derived from Laplace equation.The boundary conditions between interfaces and their discrete forms are given.The expressions for electrical potential and capacitance are obtained.The effect of the accuracy of this method on the calculation result is discussed.The result is compared with the measured value of LCX with the same specifications,which validates the effectiveness of this method.Finally,the influence of the slot angle on the capacitance of the LCX is analyzed.

Key words: leaky coaxial cable;eight-shaped slot;finite difference method;capacitance