Magnetic current distribution and far-field radiation characteristics of a dual-fed annular slot

This paper presents an analysis of the magnetic current distribution and far-field radiation of a dual-fed annular slot. The analysis is conducted for an annular slot of mean radius a and width b on an infinite, perfectly conducting ground plane in free space. The annular slot is fed via two delta gap feeds at /spl phi/´=0/spl deg/ and /spl phi/´=k/spl deg/ with an amplitude of unity (I/sub e/=1) and a phase of 0 radians and /spl psi/ radians respectively.