Patent attributes
Exemplary embodiments are provided of RFID antenna assemblies having folded patch-antenna structures and that are configured with circular polarization or dual linear polarization. An antenna assembly may generally include two folded patch-antenna structures oriented generally perpendicularly to each other. Each folded patch may create a linear polarization wave. When each folded patch is fed independently, the antenna assembly radiates two independent waves that are perpendicularly polarized to each other, therefore providing a dual polarized antenna. In other embodiments, the antenna assembly may include two folded patch-antenna structures again oriented generally perpendicularly to each other. By feeding each folded patch with a 90-degree phase delay between them, a circular polarization wave is radiated. A power divider network may be used to feed the two folded patches with the 90-degree phase delay. The two folded patches may be integrated so as to form a cavity or housing for a printed circuit board.
