DUAL-BAND, DUAL-POLARIZED PATCH ANTENNAS

Two new configurations of patch antennas are introduced, which provide dual-band and dual-polarization operations. The two patches have a square and cross shape, and are printed on a single layer; the dual-frequency and the dual-polarization behavior is obtained by means of four narrow slots close to the edges. Excellent decoupling between the two orthogonal modes at each frequency is obtained in both configurations. Furthermore, a satisfactory performance of simultaneous matching When using a single feed point is demonstrated. Simple and accurate design formulas to predict the two resonant frequencies are derived on the basis of a physical model and tested by using a full-wave analysis. Some prototypes have been carried out and measured. (C) 1995 John Wiley & Sons, Inc.