Wave transmission lines and networks – Resonators – Coaxial or shielded
Patent
1996-01-11
1997-04-15
Pascal, Robert
Wave transmission lines and networks
Resonators
Coaxial or shielded
333222, 333223, 333231, 333232, H01P 704
Patent
active
056213670
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/FI94/00192, filed May 13, 1994.
FIELD OF THE INVENTION
The invention relates to a coaxial resonator comprising an inner conductor with walls defining therebetween a free space, and a housing portion surrounding the inner conductor and forming an outer conductor of the resonator.
BACKGROUND OF THE INVENTION
Various coils and capacitors are used widely as components in electro-technical devices, such as oscillators and filters. With increasing frequencies the losses of capacitors and coils, however, increase to such an extent that various cavity and coaxial resonators and dielectric resonators are the only alternative in terms of losses.
Particularly within the frequency range from 1 to 10 GHz, where the resonator according to the invention is to be used, cavity resonators are often large and require special components with expensive packings. The use of dielectric resonators in turn results in a structure having the disadvantages of e.g. being difficult to assemble and difficult to tune electrically. Having low losses, coaxial resonators are the most widely used especially at high powers. The losses of coaxial resonators decrease with increasing resonator sizes while their power handling capacity increases. A disadvantage of a resonator made of a conventional coaxial conductor is its difficult frequency adjustment, but if the resonator is provided with an inner conductor open in the middle, the frequency is easy to adjust by an adjusting screw or a similar adjusting means, which extends inside the inner conductor of the resonator. The present invention, in fact, is based on a coaxial resonator having the advantages described above and allowing the frequency to be adjusted as described above.
In the prior art resonator structure having the above-described properties, the inner conductor is implemented as a thick-wall metal tube into which the frequency adjusting means penetrates. Devices based on this basic structure (e.g. oscillators) have previously been implemented by bringing the active components surrounding the resonator, such as transistors, varactors and Gunn diodes, into galvanic contact with the side of the inner conductor. This has required the use of expensive (special) components. If the resonator has been used in a filter, it has been necessary to connect the inner conductor to an output connector by a separate conductor wire. Coupling to the inner conductor of the resonator has thus involved a complicated structure difficult to implement and possibly also requiring components more expensive than usually.
SUMMARY OF THE INVENTION
The object of the present invention is to avoid the above disadvantages by improving the basic structure of the coaxial oscillator described in the beginning in such a way that connection to the inner conductor can be made very simply. This object is achieved by a coaxial resonator according to the invention, which is characterized in that the inner conductor is made of sheet material in which slits extending in the direction of the inner conductor are made so that they form between them a tongue-like connecting part having its free end connected to a printed circuit board.
The basic feature of the invention is that slits extending in the (longitudinal) direction of the inner conductor are formed in the (thin) wall of the inner conductor in a manner such that a connecting tongue is formed between the slits, which is easy to solder to a printed circuit board at its free end.
The solution according to the invention also allows resonator of a high Q factor to be produced which is easy to realize, suitable for series production and advantageous in costs.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following the invention and its preferred embodiments will be described more fully with reference to the examples shown in the attached drawings, where
FIG. 1 is a cross-sectional view of a coaxial resonator according to the invention;
FIG. 2 is a perspective view of an inner conductor in a coaxial resonato
REFERENCES:
patent: 2562921 (1951-08-01), Kandoian
patent: 4906955 (1990-03-01), Yorita et al.
patent: 4954796 (1990-09-01), Green et al.
patent: 5105174 (1992-04-01), Cruchon et al.
Gambino Darius
Nokia Telecommunications Oy
Pascal Robert
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