Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
2000-06-07
2001-12-25
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
Spiral or helical type
Reexamination Certificate
active
06333722
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an helical antenna, and more particularly to a helical antenna having an antenna section configured by providing insulator bodies with helical conductors.
2. Description of the Related Art
FIG. 6
illustrates a conventional helical antenna. The helical antenna is configured by providing a strip or strips of helical conductor
12
around the circumference of a cylindrical molded body
11
of an insulating material (e.g. resin) having a hollow
11
a
in the center. The helical conductor
12
can be formed by winding a wire of copper or some other material helically or by printed wiring. In providing the helical conductor
12
, a helical groove may be formed around the circumference of the cylindrical molded body
11
to prevent the conductor from slipping out of place. Such a helical antenna has an advantage of reduced overall length over a vertical antenna of a ¼ wavelength or the like, consisting of a single conductor standing vertically. The presence of the hollow
11
a
in the center of the molded body
11
provides an additional advantage of reduced dielectric loss.
However, the conventional helical antenna, while its dielectric loss is reduced by providing the hollow
11
a
, involves the problem that thinning the thickness of the molded body
11
to further reduce its dielectric loss and its weight at the same time would weaken the strength or the molded body
11
and make it more difficult for the molded body to be drawn out of the mold.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a helical antenna permitting a further diminution in dielectric loss, easier drawing and a reduction in weight.
In order to achieve the object stated above, according to the invention, there is provided a helical antenna consisting of a cylindrically shaped insulating body over which an element is helically laid, the cylindrical insulating body consisting of a plurality of insulator units presenting a cylindrical shape when combined, and said element consisting of a plurality of element units formed over said plurality of insulator units and having end parts which, when said plurality of insulator units are combined, are electrically connected in the connecting part.
According to this configuration, a cylindrical insulator body is manufactured in a form divided into a plurality of insulator units, and to the insulator units, when they are combined with one another into a single cylindrical insulator body, the end parts of the elements are electrically connected at the same time. As the unitized manufacture facilitates fabrication using molds or the like, it is made possible to thin the thickness of the insulatorunits, i.e. that of the cylindrical insulator body, reduce dielectric loss and enhance the antenna performance, and the thinner insulator units , would be made correspondingly lighter in weight.
REFERENCES:
patent: 5587719 (1996-12-01), Steffy
patent: 6018326 (2000-01-01), Rudisill
patent: 6150994 (2000-11-01), Winter et al.
patent: 6163307 (2000-12-01), Kim et al.
Ho Tan
NEC Corporation
Young & Thompson
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