NONDIRECTIONAL BROADBAND ANTENNA Russian patent published in 2014 - IPC H01Q9/00 

FIELD: radio engineering, communication.

SUBSTANCE: nondirectional broadband antenna consists of a hollow metal cone 1 with height H_k and apex angle α, a conical spiral 2 with apex angle β and height H_s=H_k. The hollow metal cone 1 is placed vertically over a conducting surface 4 and faces said surface with its apex. The conical spiral 2 is placed coaxially in the cavity of the hollow metal cone 1 and is linked by the apex to the inner cavity of the hollow metal cone 1 at its apex. A coaxial feeder 3 is connected by the centre conductor to the apex of the hollow metal cone 1 and by the screening cover to the conducting surface 4.

EFFECT: wider operating range by enabling operation of the antenna in the low frequency range.

3 cl, 4 dwg