Communications: radio wave antennas – Antennas – With signal – indicator or alarm
Reexamination Certificate
2006-04-11
2006-04-11
Vo, Tuyet (Department: 2821)
Communications: radio wave antennas
Antennas
With signal, indicator or alarm
Reexamination Certificate
active
07027009
ABSTRACT:
A method and apparatus for communicating simultaneously at the same frequencies includes two or more conductor-backed, spiral antennas that have been shown to exhibit linear polarization. To permit simultaneous transmission on the same frequencies, two of the linearly polarize, conductor-backed spiral antennas can be spaced vertically and be oriented so that the feed points of one antenna are orthogonal to the feed points of the second antenna. Since the specifically designed spiral antennas will be both transmitting or both receiving at orthogonally arranged polarizations, the antennas will not interfere with each other, even though communication is upon substantially the same frequencies.
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Adams Richard C.
Hunt Barry R.
Cao Huedung X.
Kagan Michael A.
Lee Allan Y.
Lipovsky Peter A.
The United States of America as represented by the Secretary of
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