A locally conformal FDTD analysis of cou-pling properties of a doublet slot antenna in a rectangular waveguide is given in this paper, based on the principles of equivalence and superposition of electromagnetic fields.Firstly, a modified locally conformal finite-difference time-domain (MLC-FDTD) is presented, which is used to ana-lyze the arbitrarily shaped slots in a finite wall thickness waveguide. MLC-FDTD not only removes the instability of the original locally conformal FDTD algorithm, but also improves the computational accuracy by partly modifying magnetic field updated equations and the virtual electric fields according to the complexity of the slot fringe fields.Secondly, based on the MLC-FDTD, the coupling proper-ties of a two-slot antenna in a rectangular waveguide are analyzed by using the principles of equivalence and super-position of electromagnetic fields. The equivalent two-port network S parameters of one slot including the mutual cou-pling effect are given, which gives a basis of analysis of complicated coupling properties of the slot antenna array using FDTD method.
展开▼
