The invention relates to a
broadband high-efficiency and high-directionality
electrically small antenna, and belongs to the technical field of antennae. The antenna comprises an exciting unit, an upper parasitic unit, a lower parasitic unit, two thin cylindrical
dielectric slabs and a coaxial feeder. The radii of the two thin cylindrical
dielectric slabs are the same, the centers of the two thin cylindrical
dielectric slabs are aligned, and the two thin cylindrical dielectric slabs are parallel in the vertical direction. The exciting unit and the upper parasitic unit are arranged on the bottom surface and the top surface of the upper thin cylindrical
dielectric slab respectively, and the lower parasitic unit is arranged on the top surface of the lower thin cylindrical
dielectric slab. An inner conductor and an outer conductor of the coaxial feeder are connected with two
metal sheets of the existing unit respectively, and the feed end of the coaxial feeder penetrates through the lower thin cylindrical
dielectric slab, extends to the lower side of the lower thin cylindrical dielectric slab by a certain distance and is connected with a 50
omega signal source. The antenna is simple in design, compact in structure and easy to manufacture and can be applied to
broadband wireless communication systems with the
operating frequency being 1 GHz or so.