RIGOROUS ANALYTICAL EXPRESSIONS FOR THE ELECTROMAGNETIC PARAMETERS OF RECTANGULAR COAXIAL COUPLERS WITH CIRCULAR AND SQUARE INNER CONDUCTORS

摘要

This article presents a set of accurate closed-form formulas for the primary parameters (inductance [L] and capacitance [C] matrices) and the impedances (Z_(oe), Z_(oo)) of the even- and odd-modes for rectangular coaxial couplers with circular and square inner conductors. The analytical expressions, deduced from rigorous analysis by the finite element method (FEM), the method of moment (MoM)~3 and curves fitting techniques, can be easily implemented in CAD simulation tools to design components for wireless communication. This study presents accurate and suitable general expressions for all rectangular coaxial couplers with a wide range of cut depth 'd' and an outer to inner conductor ratio between 1.4 and 10.