Methods and systems are provided for implementing and utilizing dual-polarized planar ultra-wideband antennas. An example planar antenna may include a substrate, a monopole conductor located on a first side of the substrate, a first ground conductor located on a second side of the substrate, and a second ground conductor located on the first side of the substrate. The monopole conductor may be connected to a first signal feeding line, the first ground conductor may be connected through a ground connector to ground potential, the first ground conductor may be connected to a second signal feeding line and, and the second ground conductor may be connected to ground potential located on the first side of the substrate. The planar antenna may be configured to form multiple sub-antennae during active operations. The planar antenna may also be configured to form a ring-antenna during operations.