Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
1998-10-19
2001-04-24
Phan, Tho (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S715000, C343S749000
Reexamination Certificate
active
06222491
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an antenna device for a radio communications apparatus operating in the frequency range of 800-3000 MHz and including a radiator.
2. Related Art
On small portable radio communications apparatus, so-called mobile telephones, use has previously been made of a plurality of different antenna types, including rod antennas of the quarter wave or half wave type, helix antennas, etc. One common denominator for all of these prior art designs and constructions is that attempts have been made to keep the physical dimensions of the antenna as small as possible, the degree of efficiency as high as possible and the band width as large as possible. Certain antenna types have proved to be successful in one or two of these respects, but no truly optimum design and construction has yet been developed.
In particular in such situations where transmission and reception take place at great distances in terms of frequency, it is important that the antenna is of the wide band type.
SUMMARY OF THE INVENTION
The present invention has for its object to realize an antenna of the type disclosed by way of introduction which obviates the drawbacks inherent in prior art models. In particular, the present invention has for its object to realize an antenna device which has a good band width, which has small physical dimensions and which is insensitive to changes in the substrate plane. Furthermore, the present invention has for its object to realize an antenna device which is simple and economical in manufacture and which displays a high level of mechanical strength.
The objects forming the basis of the present invention will be attained if the antenna disclosed by way of introduction is characterized in that there is connected, to the supply line of the antenna, a dielectric resonator which is galvanically discrete from the radiator but which is disposed to supply it.
Further advantages will be attained if the antenna device is moreover characterized in that the radiator is a rod radiator which is connected in its one end to a coil, that the coil surrounds at least a part of the dielectric resonator and that the end of the coil facing away from the rod radiator is connected to ground.
These characterizing features will realize an antenna which satisfies the objects established in the present invention. Other objects, features, and advantages of the invention will be apparent from the ensuing description in conjunction with the accompanying drawings.
REFERENCES:
patent: 4365221 (1982-12-01), Vizmuller
patent: 5179074 (1993-01-01), Fiedzisuzko et al.
patent: 5471222 (1995-11-01), Du
patent: 5898408 (1999-04-01), Du
Moteco AB
Phan Tho
Rader, Fishman, Grauer & McGarry
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