Dual-array two-port differential GPS antenna systems

Details Dual-array two-port differential GPS antenna systems Dual-array two-port differential GPS antenna systems

2006-10-10

2006-10-10

Ho, Tan (Department: 2821)

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

C343S800000, C343S891000

Reexamination Certificate

active

07119757

ABSTRACT:
Dual-array two-port GPS antenna systems can provide horizon to zenith reception for differential GPS applications. On a single mast, an antenna system may include a lower array of sub-arrays (e.g., fifteen sub-arrays) to provide elevation coverage from horizon up to about 55 degrees elevation and an upper array of sub-arrays (e.g., three sub-arrays) to provide elevation angle coverage from zenith down to about 55 degrees elevation. Each sub-array may be of the same construction including four dipoles positioned at different azimuth locations and configured to provide a progressive-phase-omnidirectional (PPO) azimuth pattern suitable for reception of circularly polarized signals. In a particular embodiment the three sub-arrays of the upper array have PPO azimuth patterns with differing azimuth alignments and differing excitation values to provide a desired elevation angle coverage characteristic.

REFERENCES:
patent: 5534882 (1996-07-01), Lopez
patent: 5757324 (1998-05-01), Helms et al.
patent: 6201510 (2001-03-01), Lopez et al.
patent: 6300915 (2001-10-01), Lopez

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