Antenna apparatus

Details Antenna apparatus Antenna apparatus

2007-12-26

2010-10-12

Wimer, Michael C (Department: 2821)

Communications: radio wave antennas

Antennas

Active sleeve surrounds feed line

C343S837000

Reexamination Certificate

active

07812778

ABSTRACT:
An antenna apparatus is provided, which removes dead directions, and at the same time, has a suppression means for easily suppressing the change of an antenna directivity pattern caused by the effect of a feed line or a radome and an improvement means for simply improving the VSWR deterioration caused by the effect of a reflector or the radome. The antenna apparatus includes a sleeve antenna connected to a coaxial cable and a reflector in the shape of a cone, the sleeve antenna including a central conductor and a sleeve, in which the sleeve antenna is arranged in a concave portion of the cone so that the central conductor is aligned with a central axis of the cone, and a top end of the central conductor is separate from a vertex portion of the cone.

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