I. Introduction
Wireless communications technology is one of the most rapidly growing fields. An antenna is a key element that makes wireless communications possible. One of the most popular antennas is the slot antenna which is widely used in many wireless systems such as radar and satellite communications, space vehicles, aircrafts, missiles, and in standard desktop microwave sources for research purposes Depending on the application, slot antennas are mounted on bodies which have different shapes. The slotted elliptic cylinder is an attractive geometry because of some advantages including extra design parameters and for some applications where the elliptic cylinder provides a useful model for the mounting body.