Horn antenna with wide flare angle

Details Horn antenna with wide flare angle Horn antenna with wide flare angle

1985-07-01

1986-12-16

Heyman, John S.

Communications: radio wave antennas

Antennas

Wave guide type

H01Q 1306

Patent

active

046300627

ABSTRACT:
A horn antenna suitable for an amplitude-comparison broadband direction-finding system with 360.degree. azimuth coverage comprises a horn with a wide angle of flare in a plane normal to the z-axis of a cylindrical co-ordinate system and an aperture which is suitably cylindrical, as seen from that axis, and further comprises means for launching electromagnetic energy into the horn towards the aperture. In order to provide a substantially constant beamwidth over a broad frequency range, which may be as wide as 7:1, the horn and launching means are adapted to launch and propagate to the aperture a substantially pure lowest order circumferential mode having its electric field in a direction parallel to the z-axis, the launching means acting substantially as a line source coincident with the z-axis. The flare angle may be 180 degrees, and the launching means may comprise an electric probe extending substantially along the z-axis.

REFERENCES:
patent: 2415807 (1947-02-01), Barrow et al.

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