Measured versus Simulated Results of a Dual Band, Hybrid Substrate, and Shared Aperture Antenna

We present a dual band and dual polarization antenna that shares a common aperture. The low frequency element is an annular ring antenna with a shorting wall to suppress surface waves and increase isolation between excitation ports. The high frequency element is a concentric patch. Both elements use orthogonal feeds to allow either horizontal or vertical polarization. Our results show performance of the annular ring at 3.2 GHz and the concentric patch at 11.1 GHz. We reduce the footprint of the annular ring by loading with a dielectric of ε
r
=6.15 and loading the concentric patch with a dielectric of ε
r
=2.33.