Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Reexamination Certificate
1999-06-16
2001-07-24
Lee, Benny (Department: 2817)
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
C333S202000
Reexamination Certificate
active
06265954
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
In bit transport systems such as, for example, access networks for ATM (asynchronous transfer mode) transmission systems AN/A (standing for: access network/ATM), what are referred to as cross-over frequency shunts with high selectivity demands and with low losses up to frequencies of 1 GHz are among the things required.
2. Description of the Related Art
European Patent Document EP 0373028 discloses a stripline filter wherein ribbon conductors are applied on a first surface of the substrate so as to lie opposite a metallization layer that is applied surface-wide on the second surface of the substrate and that is connected to a reference potential. In a specific embodiment, the known stripline filter is folded for reducing the area occupied by the air filter, whereby the metallizations layers carrying the reference potential lie against one another and the ribbon conductors likewise lie opposite a metallization carrying the reference potential.
SUMMARY OF THE INVENTION
An object of the subject matter of the application is to provide a stripline filter that unites low structural height, low-outlay manufacturability and a high quality.
The subject matter of the present application is directed to a stripline filter including a dielectric substrate, this comprising a first principal surface and a second principal surface lying opposite the first principal surface; a plurality of striplines are arranged parallel; a ribbon conductor of a given length is divided into a first section applied on the first principal surface aid into a second section applied on the second principal surface; the first section and the second section of the ribbon conductor coincide; the first section and the second section of the ribbon conductor are connected by suitable means to form the ribbon conductor of a given length; the first ends of the ribbon conductors are connected by coupling elements ; the first ends of the outer striplines are connected to the input or, respectively, to the output of the arrangement; the second ends of the striplines are connected by a metallization applied on the second surface.
Compared to the known arrangement, the proposed resonator arrangement having folded resonators without an intervening reference potential level exhibits a shorter length of the ribbon conductors, a higher quality and also exhibits less of a coupling between the individual resonators. This is attributed to lower field displacement losses and to the fact that the folded resonators are not coupled via a common ground coating over the entire length. Moreover, the proposed stripline filter can be manufactured in an automated process and thus exhibits the advantage of low outlay to manufacture.
According to a specific development, the ends of appertaining ribbon conductor sections terminate with the edge of the substrate, and the ribbon conductor sections are connected to form one ribbon conductor by a narrow side of the metallization conducted around the substrate. This measure makes the introduction of clearances into the substrate superfluous.
According to a specific development, the ends of appertaining ribbon conductor sections are connected to form one ribbon conductor by at least one electrically conductive through-contacting, or via contact. This measure makes it possible to arrange a ribbon conductor resonator independently of the edge of the substrate.
According to a specific development, the ends of the ribbon conductors are connected via a coupling element established by an inductance or by a capacitor. In this way, filters of various types (for example, low-pass filters or band-pass filters) can be realized largely as desired with respect to the bandwidth and frequency position.
According to a particular development, one end of a ribbon conductor is connected to an interconnect that is metallized onto the substrate. This measure yields manufacturability of a ribbon conductor and an interconnect in one working cycle.
According to a specific development, a coupling element is formed with an interconnect. By realizing a coupling element in an embodiment formed on a printed circuit, this measure yields metallized onto the substrate together with other surfaces in one working cycle and eliminates the provision of a discrete component.
According to a specific development, an interconnect which is applied onto the substrate connects to discrete coupling element. A hybrid filter is formed in this way, whereby a ribbon conductor and a coupling element are arranged on a substrate. By equipping the substrate with different coupling elements, further, filters of various types (for example, low-passes filter- or band-pass filter) can be realized with the same substrate plate largely as desired with respect to the bandwidth and frequency position.
According to a specific development, a terminal of the arrangement is applied on the substrate. This measure yields simple connectability of the arrangement.
The application of the metallization layers by thick-film technology or by thin-film technology onto the substrates yields manufacturability using a standard technology.
REFERENCES:
patent: 5124675 (1992-06-01), Komazaki et al.
patent: 5654681 (1997-08-01), Ishizaki et al.
patent: 5812037 (1998-09-01), Block
patent: 689 15 408 T2 (1994-05-01), None
patent: 0 617 478 A1 (1994-09-01), None
Japanese Abstract, 07240611, Sep. 12, 1995.
Jones Stephen E.
Lee Benny
Schiff & Hardin & Waite
Siemens Aktiengesellschaft
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