Coupling through a double slit between two parallel-plate waveguides

A solution for coupling through a double slit between two parallel-plate wa veguides is obtained in analytic series form. The Fourier transform is used to express the scattered field in the spectral domain in terms of waveguid e modes. The simultaneous equations for the modal coefficients are solved t o obtain the transmission and reflection coefficients in simple, rigorous, and numerically efficient series. Numerical computations are performed to i llustrate the coupling and directivity characteristics of a double-split co upler. (C) 2000 John Wiley & Sons, Inc.