Communications: radio wave antennas – Antennas – Wave guide type
Reexamination Certificate
2002-10-09
2003-12-23
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
Wave guide type
C343S774000, C343S905000
Reexamination Certificate
active
06667721
ABSTRACT:
BACKGROUND OF THE INVENTION
The following invention relates to antennas and more specifically to broad band antennas of bicone design.
It is desirable to provide an omnidirectional vertically polarized antenna that operates over a wide frequency band. If this goal is met, programmable radios that operate over a wide frequency band can then be connected to a single antenna. The antenna could also be used for several radio systems, thereby reducing the number of antennas required.
It is typical to provide dedicated antennas for each radio frequency band used. These bands are typically 10 to 50% of the center frequency of operation. For example, military ultra high frequency (UHF) radios typically operate from 225 to 400 MHz. The antenna used for these radios operate only over this band. For radios operating over other bands, an antenna will be used for each of the radios.
Such dedicated antennas are commonly used on shipboard systems, resulting in an “antenna farm” on the ship's topside and/or many antennas mounted on the ship's mast. In those instances where broad band antennas are used, such as with electronic counter measure equipment, the antennas are usually based on class bicone antenna designs that are very large in size.
There is thus a need for a broad band antenna that can be used for a number of communication systems while at the same time is of minimal size.
SUMMARY OF THE INVENTION
The invention is a broad band antenna that uses a bicone antenna configuration as a feed transformer and exponentially tapered reflector fins to radiate the antenna's energy. The fins function to reduce the traditional bicone antenna diameter. Reflection between the cones and the attached reflector fins as well as return loss are substantially reduced by wrapping the reflector fins with metallic foil.
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W.L. Barrow et al, Biconical Electromagnetic Horns, Proceeding of the I.R.E., Dec. 1939, pp 769-779.
Ho Tan
Kagan Michael A.
Lee Allan Y.
Lipovsky Peter A.
The United States of America as represented by the Secretary of
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