Dual polarized, single- and double-layer strip-slot-foam inverted patch (ssfip) antennas

A new way of feeding an SSFIP antenna to obtain two orthogonal linear or two circular (RHCP/LHCP) polarizations is presented. The advantages of the method are its simplicity, a perfect symmetry of the structure and of the pattern, and an excellent decoupling between input ports. The enhanced element retains the desirable properties of conventional SSFIP elements: wide bandwidth, low cost, robustness, and low thickness and weight. © 1994 John Wiley & Sons, Inc.