Antennas providing near-spherical coverage with right-hand...

Details Antennas providing near-spherical coverage with right-hand... Antennas providing near-spherical coverage with right-hand...

2011-07-19

2011-07-19

Ho, Tan (Department: 2821)

Communications: radio wave antennas

Antennas

Wave guide type

C343S850000

Reexamination Certificate

active

07982680

ABSTRACT:
Accuracy of derivation of local corrections to GPS signals for use for aircraft landing guidance is subject to effects of reflected multipath signals. Antennas with a near-spherical antenna pattern of right-hand circular polarization, except within a downward cone, provide suppression of reflected multipath GPS signals incident from all azimuth angles and all relevant elevation angles. For such an antenna a cylindrical top assembly may include spaced conductive disks with intermediate exciter members excited at increments of 90 degree phase and surrounded by a dielectric ring. A cylindrical base assembly may include signal absorbent top and side wall portions and a bottom conductive disk and may alternatively include a signal absorbent inner wall portion.

REFERENCES:
patent: 6414647 (2002-07-01), Lee
patent: 2009/0237314 (2009-09-01), Lalezari

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