A dual frequency antenna providing nulling of adjacent radio signals. The
antenna is formed on a single substrate of dielectric material and
features a first antenna for a first frequency on top surface of the
substrate mutually coupled to a second antenna formed for reception of a
second frequency on the bottom surface of the substrate. A single antenna
feed communicates through the substrate with the first antenna
communicates both received frequencies to an attached device. Feeding the
single antenna feed through the substrate wall inside the interior of both
antenna perimeters provides for an unobstructed view above the first
antenna. The nulled portion of the reception pattern may be steered by
tilting the antenna.
