Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Reexamination Certificate
2007-02-06
2007-02-06
Dinh, Trinh Vo (Department: 2821)
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
C343S795000, C343S797000
Reexamination Certificate
active
10660980
ABSTRACT:
A dual band, dual pole, variable downtilt, 90 degree azimuth beamwidth antenna (10). The antenna includes dipole elements (12, 14) forming both a PCS band and a cellular band antenna. The PCS band antenna has two sections disposed each side of the cellular band antenna, the elements of each being positioned 90° with respect to the other. A microstrip feed network formed upon a common PC board (18) feeds the respective dipole elements, and has serpentine portions with a corresponding dielectric member slideable thereover to establish the phase of the associated dipole antennas and achieve a linear downtilt of the respective antenna array. A slide rod adjustment assembly (100) provides unitary movement of the dielectric members between two different slide rods. These dielectric members are secured with adhesive to the respective slide rods to achieve good dielectric control and no use of hardware. The radiating dipole elements are capacitively coupled to each microstrip, and are also capacitively associated reflector element. One arm of the reflector element is offset at least 45 degrees with respect to the other arm to improve cross polarization.
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Antenna Frequency Scaling, p. 2-24-2-25.
Bonczyk Michael F.
Cao T. Huy
Le Kevin
Teillet Anthony
Timofeev Igor
Andrew Corporation
Dinh Trinh Vo
Jackson Walker L.L.P.
Klinger Robert C.
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