Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
1999-09-20
2001-07-10
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
Spiral or helical type
C343S7000MS
Reexamination Certificate
active
06259420
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an antenna element for circular polarization comprising a ground plane, with first to fourth radiation members in the form of helical wires, symmetrically arranged around a symmetry axis, as well as a distribution network arranged below the ground plane.
Such antenna elements are known, with cylindrical or conical arrangement of the radiation members. These are fixed in space by winding them on some substrate of dielectric material, or by etching them on a substrate, which is then formed, usually into a cylinder.
The substrate, which usually consists of a polymer, may give rise to electrostatic discharges, which is a problem as far as a space application is concerned. The discharges may also cause problems in the amplifier stages of the connected receiver.
Thus, there is a need of an antenna element of the kind mentioned in the introduction, which does not exhibit the above-mentioned disadvantages.
SUMMARY OF THE INVENTION
According to the invention, such an antenna element is characterized in that the radiation members in their outer lower ends are attached in a supporting manner, electrically conducting, to the ground plane, and in that the radiation members in their upper ends, facing away from the ground plane, are electrically interconnected.
In a preferred embodiment, each of the radiation members is connected to the distribution network at a point at the distance &lgr;/4 from its outer, lower end.
REFERENCES:
patent: 2184940 (1939-12-01), Cork et al.
patent: 3188643 (1965-06-01), Dyson et al.
patent: 3836979 (1974-09-01), Kurland et al.
patent: 5346300 (1994-09-01), Yamamoto et al.
patent: 5349365 (1994-09-01), Ow et al.
patent: 6011524 (2000-01-01), Jervis
patent: 0465658 (1992-01-01), None
patent: WO 94/21005 (1994-09-01), None
Bengtsson Par
Brattström Sven-Olof
Ho Tan
Saab Ericsson Space AB
Swidler Berlin Shereff & Friedman, LLP
Vo Tuyet T.
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