Communications: radio wave antennas – Antennas – With vehicle
Reexamination Certificate
2008-02-22
2008-11-25
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
With vehicle
C343S835000, C343S836000
Reexamination Certificate
active
07456797
ABSTRACT:
An antenna system comprises a parasitic element, which is an electrically tuned structural element, installed between antennas to reduce or eliminate antenna-to-antenna coupled electromagnetic interference by emitting destructive interference in the direction from one antenna to another antenna. The antenna system comprises a first antenna operating at a first wavelength, a second antenna operating at a second wavelength, and a parasitic element located between the first antenna and the second antenna for reducing the amplitude of signals from the first antenna that would otherwise create electromagnetic interference in a receiver connected to the second antenna. The parasitic element is typically spaced from the first antenna by a distance substantially equal to one quarter of the first wavelength. The parasitic element generally has a height that is greater than the height of the first antenna.
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Francque Craig
Lindsey Phillip A.
Alston & Bird LLP
Ho Tan
The Boeing Company
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