Communications: radio wave antennas – Antennas – Logarithmically periodic
Reexamination Certificate
2005-08-02
2005-08-02
Chen, Shih-Chao (Department: 2821)
Communications: radio wave antennas
Antennas
Logarithmically periodic
C343S810000, C343S818000, C343S797000, C343S846000
Reexamination Certificate
active
06924776
ABSTRACT:
A dual polarized variable beam tilt antenna (10) having a plurality of offset element trays (12) each supporting pairs of dipole elements (14) to orient the dipole element pattern boresight at a downtilt. The maximum squint level of the antenna is a consistent downtilt off of boresight and which is at the midpoint of the antenna tilt range. The antenna provides a high roll-off radiation pattern through the use of Yagi dipole elements configured in this arrangement, having a beam front-to-side ratio exceeding 20 dB, a horizontal beam front-to-back ratio exceeding 40 dB, and is operable over an expanded frequency range.
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Le Kevin
Meyer Louis J.
Alemu Ephrem
Andrew Corporation
Chen Shih-Chao
Jackson & Walker, LLP
Klinger Robert C.
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