Communications: radio wave antennas – Antennas – Plural separate diverse type
Reexamination Certificate
1999-04-19
2001-04-17
Phan, Tho (Department: 2821)
Communications: radio wave antennas
Antennas
Plural separate diverse type
C343S729000, C343S752000, C343S767000, C343S770000
Reexamination Certificate
active
06218997
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an antenna for a plurality of radio services in the form of a dipole or monopole.
2. The Prior Art
Antennas of this type are known from German Patent DE 193 10 226 A1. The antenna described in this patent has a capacitive surface and an antenna conductor disposed substantially perpendicular relative to this surface. Together with the conductive base surface, and the decoupling of the signals as specified in this patent via the coupling conductor
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, an antenna in the form of a monopole is used. Its direction of polarization extends substantially perpendicular to the top capacity. By arranging slots in the top capacity, the latter becomes electrically divided, depending on the frequency, so that for a monopole operation with polarization oriented perpendicular to the top capacity, a plurality of radio services are obtained on the antenna. Antennas of this type thus have the limitation that their polarization is oriented perpendicular to the top capacity. Thus it is not possible in the present state of the art for one singular antenna to communicate with several vertically polarized mobile terrestrial telephone radio services. Thus, it is not possible even if this one antenna uses either single or multifrequency communication with satellite radio services, whether linear or circularly polarized.
SUMMARY OF THE INVENTION
Therefore, it is an object of the invention to provide an antenna that provides both radio reception with a polarization perpendicular to the top capacity, and at least one additional radio service with parallel polarization relative to the top capacity. Thus this type antenna provides a combined function for radio services with planes of polarization disposed vertically, one on top of the other.
With the antenna according to the invention, it is possible to gain the advantage of covering, with one component, a great variety of terrestrial, and satellite radio services with very low cost. Particularly for mobile radio services, it is possible to design compact motor vehicle antennas which, cover the mobile telephone services GSM in the D-network (about 0.9 GHZ), and the E-network (about 1.8 GHZ) with vertical polarization, and at the same time, the satellite radio service for location determination (GPS radio service at about 1.5 Ghz). In this case, the waves arrive predominantly horizontally, and with circular polarization due to a plurality of a zenith close satellites. As opposed to the vertically polarized radio service with a gap in the directional diagram, or a pattern in the zenith, GPS navigation service requires a circularly polarized antenna and has a maximum reception at its zenith. This requirement can be advantageously satisfied at low expenditure with an antenna as defined by the present invention.
REFERENCES:
patent: 4023179 (1977-05-01), Ikrath et al.
patent: 5012255 (1991-04-01), Becker
patent: 5748152 (1998-05-01), Glabe et al.
patent: 5850198 (1998-12-01), Lindenmeier et al.
patent: 5955997 (1999-09-01), Ho et al.
Hopf Jochen
Lindenmeier Heinz
Collard & Roe P.C.
FUBA Automotive GmbH
Phan Tho
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