Broadband directional antenna

Details Broadband directional antenna Broadband directional antenna

1988-02-05

1991-10-01

Sikes, William L.

Communications: radio wave antennas

Antennas

Spiral or helical type

H01Q 136

Patent

active

050537865

ABSTRACT:
A broadband antenna includes a center fed active radiating/receiving element formed of two contiguous conductive spirals. The two planar antenna spirals are secured to a cavity loaded with a wave absorbing lossy material such that the antenna is operative only in its front lobe direction opposite the loaded cavity.
In accordance with the present invention, the cavity wall is formed of varying pattern of conductive and insulative material. The resultant composite antenna is characterized by a relatively narrow beam pattern for both horizontally and vertically polarized electric waves across a broad spectrum of frequencies.

REFERENCES:
patent: 4012744 (1977-03-01), Greiser
patent: 4085406 (1978-04-01), Schmidt et al.
patent: 4095230 (1978-06-01), Salmond et al.
patent: 4114164 (1978-09-01), Greiser
patent: 4319248 (1982-03-01), Flam
patent: 4459596 (1986-07-01), Flam
patent: 4609888 (1986-09-01), Corzine et al.

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