Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Reexamination Certificate
1999-08-06
2001-05-08
Wong, Dong (Department: 2821)
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
C343S702000
Reexamination Certificate
active
06229495
ABSTRACT:
RELATED APPLICATIONS
(Not Applicable)
FEDERALLY SPONSORED RESEARCH
(Not Applicable)
BACKGROUND OF THE INVENTION
This invention relates to antennas and, more particularly, broadband whip antennas providing improved performance.
The design and implementation of many varieties of whip antennas are well known. The general-usage dictionary definition of “a flexible radio antenna” encompasses the typical configuration of a base-supported flexible upright element of extended length. The
IEEE Standard Dictionary of Electrical and Electronic Terms
is more specific in its reference to “a thin flexible monopole antenna”. Prior types of whip antennas are suitable for many applications, subject to inherent limitations such as range of coverage and usable frequency band for an individual antenna design.
Objects of the present invention are, therefore, to provide new and improved whip antennas and such antennas having one or more of the following characteristics and advantages
15:1 bandwidth (e.g., 30 to 450 MHz);
broadband dual radiator construction, dipole above monopole;
dual-point-feed, bands separated for dipole and monopole;
elevated, high frequency dipole for increased range;
coaxial construction, with outer conductor forming low frequency monopole;
coaxial high and low band radiators;
dipole above monopole in single elongated radome;
single port input/output at antenna base;
diplexed feeds to high and low band radiators;
simplified, low cost construction; and
readily mountable on a vehicle or other support structure.
SUMMARY OF THE INVENTION
In accordance with the invention, a dual-radiator whip antenna includes a vertically-extending concentric structure. An outer element circumferentially surrounds an inner conductor, with the outer element configured to provide a first radiating element (monopole) operable over a first frequency band. The inner conductor has an upper extension extending vertically beyond the upper terminus of the outer element, with the upper extension configured to provide a second radiating element (dipole) operable over a second frequency band. A feed configuration is arranged to couple first signals within the first frequency band to the outer element and couple second signals within the second frequency band to the upper extension. The feed configuration may include: a diplexer coupled to an antenna port to separate signals into first signals at a first diplexer port and second signals at a second diplexer port; a lower feed circuit at the base of the antenna to couple signals from the first diplexer port to the outer element and signals from the second diplexer port to the inner conductor; and an upper feed circuit coupled between the upper terminus of the outer element and the upper extension of the inner conductor to excite the second radiating element.
For a better understanding of the invention, together with other and further objects, reference is made to the accompanying drawings and the scope of the invention will be pointed out in the accompanying claims.
REFERENCES:
patent: 4916457 (1990-04-01), Foy et al.
patent: 5812097 (1998-09-01), Maldonado
patent: 5963871 (1999-10-01), Zhinong et al.
patent: 5977928 (1999-11-01), Ying et al.
patent: 5990848 (1999-11-01), Annamaa et al.
Kumpfbeck Richard J.
Lopez Alfred R.
Pedersen John F.
BAE Systems Advanced Systems
Onders Edward A.
Robinson Kenneth P.
Tran Chuc D
Wong Dong
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