Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Reexamination Certificate
2000-08-21
2002-08-20
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
C439S607070, C439S620040, C361S302000
Reexamination Certificate
active
06437664
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a multiple filter, the use of such a multiple filter as a plug connector and to a method for producing such a multiple filter.
Multiple filters are known per se. In many cases, planar filters are used in which the capacitor electrodes are provided in a plane at right angles to the alignment of the signal conductors. As a consequence, only limited capacitances can be accommodated in the limited space on the bases of such planar filters. For larger capacitances, filters have been developed which surround the signal conductors like tubular capacitors. This makes larger electrode areas possible and larger capacitances can be achieved, which can be further increased by the use of dielectrics with dielectric constants of the order of magnitude of 10
3
to 10
4
, for example as disclosed in U.S. Pat. No. 4,494 092, in French Patent Document FR 2 422 268 or in Published, Non-Prosecuted German Patent Applications DE-OS 26 00 320 or DE-OS 28 00 745.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a multiple filter, in particular for plug connectors, which overcomes disadvantages of the heretofore-known multiple filters of this general type and which can be produced easily and economically. A preferred embodiment of the multiple filter should be usable in the frequency range of up to and above 10 GHz. The multiple filter should have the capability of not only being fitted with discrete components but also with thick or thin-film technology. The multiple filter should furthermore operate in a reliable and safe manner.
With the foregoing and other objects in view there is provided, in accordance with the invention, a first embodiment of a multiple filter, including:
a cuboid block made of an insulating material and having an exterior region;
the cuboid block being formed with a number of passages to be assigned to a corresponding number of signal conductors;
at least one capacitor being respectively assigned to each of at least some of the passages;
the at least one capacitor having a signal electrode and a ground electrode and a dielectric layer provided therebetween;
the signal electrode being electrically connected to an associated one of the signal conductors;
a ground conductor connectable to ground;
the dielectric layer including a dielectric with a dielectric constant in an order of magnitude of 10
3
to 10
4
, the dielectric being formed of the insulating material;
the at least one capacitor being in a form of a capacitor column;
the capacitor column being provided in the cuboid block and being surrounded by the cuboid block, the capacitor column being formed with a central channel and having an outer wall, the central channel forming one of the passages;
the signal electrode of the at least one capacitor being formed in the central channel; and
the ground electrode being provided in a region of the outer wall of the capacitor column, the ground electrode being a metal layer at least partially covering the outer wall and
being connected to the ground conductor extending transversely to the central channel.
A second embodiment of the multiple filter includes:
a cuboid block made of an insulating material and having a base and an exterior region;
the cuboid block being formed with a number of passages to be assigned to a corresponding number of signal conductors;
capacitors being respectively assigned to each of at least some of the passages;
the capacitors each having a signal electrode and a ground electrode and a dielectric layer provided therebetween;
the signal electrode being electrically connected to an associated one of the signal conductors;
a ground conductor connectable to ground;
the dielectric layer including a dielectric with a dielectric constant in an order of magnitude of 10
3
to 10
4
, the dielectric being formed of the insulating material;
the capacitors being in a form of capacitor columns and having feet;
the capacitor columns standing with the feet on the base of the cuboid block and being separated as islands at least by transverse grooves formed in the cuboid block;
the capacitor columns each being formed with a central channel having an inner wall, and the capacitor columns each having an outer wall, the central channel forming one of the passages;
the signal electrode being provided in a region of the inner wall; and
the ground electrode being provided in a region of the outer wall, the ground electrode being a metal layer at least partially covering the outer wall and being connected to the ground conductor extending transversely to the central channel.
In accordance with another feature of the invention, a metallic coating is connected to the central channel, the metallic coating forming the signal electrode.
In accordance with yet another feature of the invention, the ground electrode is a metallization, the metallization surrounds the capacitor columns in a manner of a tube.
In accordance with a further feature of the invention, the cuboid block is formed with grooves; and shielding metal strips are introduced in at least some of the grooves and are connected to ground.
In accordance with another feature of the invention, the cuboid block is formed with grooves, the grooves have respective bases; and ground conductors are provided in the bases of the grooves.
In accordance with another feature of the invention, an associated one of the signal conductors is provided at a distance from the signal electrode and thus from the dielectric; the signal electrode is subdivided into at least two electrode elements separated in a direction of a signal propagation; and the electrode elements are electrically connected, via at least one signal connecting conductor, with the associated one of the signal conductors such that the at least one capacitor is formed from capacitor elements and includes a continuous electrode and a subdivided electrode.
In accordance with yet another feature of the invention, the at least one signal connecting conductor and the associated one of the signal conductors are connected by an essentially point-shaped connection; and a further dielectric having a further dielectric constant in a range from 10
0
to 10
1
is provided between the associated one of the signal conductors and the signal electrode.
In accordance with a further feature of the invention, the ground conductor is provided at a distance from the ground electrode and thus from the dielectric; the ground electrode is subdivided into at least two electrode elements separated in a direction of a signal propagation; and the electrode elements are electrically connected, via at least one ground connecting conductor, with the ground conductor such that the at least one capacitor is formed from capacitor elements and includes a continuous electrode and a subdivided electrode.
In accordance with a further feature of the invention, the ground connecting conductor and the ground conductor are connected by an essentially point-shaped connection; and a further dielectric having a further dielectric constant in a range from 10
0
to 10
1
is provided between the ground conductor and the ground electrode.
In accordance with another feature of the-invention, the ground conductor is a metallized strip running parallel to the central channel, at a distance from the dielectric having a dielectric constant in a range from 10
3
to 10
4
.
In accordance with yet another feature of the invention, the further dielectric is provided as a spacer between the metallization and the dieletric.
In accordance with another feature of the invention, electronic components connect the subdivided and mutually insulated electrode elements in series.
In accordance with another feature of the invention, the electronic components are resistance elements with resistance values in a range of a characteristic impedance of the associated one of the signal conductors interacting with the dielectric.
In accordance with yet another feature of the invention, the resistance elements are ohmic resistance elements.
In
Dingenotto Meinolf
Kühle Jörg
Meppelink Jan
Wallmeier Frank
Filtec Filtertechnologie Fuer Die Elektronikindustrie GmbH
Greenberg Laurence A.
Jones Stephen E.
Mayback Gregory L.
Pascal Robert
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