Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
2007-08-20
2009-10-27
Phan, Tho G (Department: 2821)
Communications: radio wave antennas
Antennas
Spiral or helical type
C343S846000
Reexamination Certificate
active
07609226
ABSTRACT:
An antenna system comprises an antenna element, a base plate, and a ground plane. The antenna element is configured to radiate signals, receive signals, or radiate and receive signals. The base plate has a front surface facing the antenna element and a rear surface facing away from the antenna element. The front surface of the base plate has an uncovered area, and the uncovered area of the base plate has no exposed conductive mechanical joints. The ground plane has a front surface facing the antenna element and a rear surface facing away from the antenna element. The antenna system further comprises a capacitive coupling between the base plate and the ground plane formed by an overlap region between the base plate and ground plane. The ground plane is capacitively coupled to the base plate in the overlap region.
REFERENCES:
patent: 2644089 (1953-06-01), Bliss
patent: 4184160 (1980-01-01), Affronti
patent: 4931806 (1990-06-01), Wunderlich
patent: 5367311 (1994-11-01), Egashira et al.
patent: 5706019 (1998-01-01), Darden et al.
Clark R. Mark
MacGahan Jonathan P.
Lockheed Martin Corporation
McDermott Will & Emery LLP
Phan Tho G
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