Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits
Reexamination Certificate
1999-10-15
2001-07-24
Lee, Benny (Department: 2817)
Wave transmission lines and networks
Coupling networks
Balanced to unbalanced circuits
C333S034000
Reexamination Certificate
active
06265950
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a transition from a waveguide to a stripline in which the waveguide has at least one ridge which reduces the waveguide cross section in the direction of the stripline.
BACKGROUND INFORMATION
A conventional transition from a waveguide to a stripline is described in a textbook by Reinmund Hoffmann, Integrierte Mikrowellenschaltung (Integrated Microwave Circuitry), Springer-Verlag 1983, pages 90, 91. As disclosed in this publication, the stepped ridge, which in bonded to the stripline, has a rectangular cross section and is mounted as a separate part in the waveguide. From the aspect of manufacturing technology, this conventional transition from a waveguide to a stripline is relatively costly.
In a transition from a waveguide to a stripline described in Japan Patent No. 05 090807, a ridge having a change in height which is continuous in stages is arranged in the waveguide. The cross-sectional shape of the ridge tapers perpendicularly to the longitudinal axis of the waveguide.
A transition from a waveguide to a stripline is described in French Patent No. 69 008 in which a stepped ridge in the waveguide has a rectangular cross section. This form of the ridge makes manufacturing difficult, particularly if the waveguide is to be one piece with the ridge.
SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide a transition of the above type which can be manufactured at the lowest cost.
The object is achieved in that the cross-section shape of the ridge is tapered perpendicular to the longitudinal axis of the waveguide, specifically from the waveguide wall extending in the direction of the stripline and all steps of the ridge are tapered to the same cross section turned toward the stripline. This conically shaped ridge has the advantage that it can be formed in one piece on a waveguide wall through stamping, or in a diecasting or cold-extrusion process or plastic injection molding process followed by metal plating. The conical shape of the ridge facilitates removal of the manufacturing tool.
In the case of a rectangular cross section of the ridge, there is specifically a danger that it will catch in the tool and that in freeing the tool, the ridge may break off from the waveguide wall. As a result of the conical shape of the ridge, it has a relatively large attachment surface on the wall of the waveguide so that the bond between the waveguide wall and the ridge achieves a high degree of strength. This of course also applies if the ridge is produced as a separate part and is subsequently mounted in the waveguide and is soldered, glued, or screwed to it.
There can be a ridge on the waveguide wall below the stripline as well as on the waveguide wall above the stripline. The height of the ridge or ridges can increase toward the stripline in steps or continuously.
The described structural configuration of the transition facilitates mass production with relatively low cost so that a transition of this kind can be advantageously used in a anticollision radar device for automobiles in order, for example, to be able to connect a Gunn oscillator therein to a stripline.
REFERENCES:
patent: 2825876 (1958-03-01), Le Vine et al.
patent: 2979676 (1961-04-01), Rueger
patent: 4973925 (1990-11-01), Nusair et al.
patent: 69 008 (1958-08-01), None
patent: 05 030 807 (1993-04-01), None
*Williams, “Millimeter-Wave Components and Subsystems built using Microstrip Technology”, IEEE Transactions on Microwave Theory and Techniques, vol. 39, No. 5, May 1, 1991, pp. 768-774.
R. K. Hoffman, “Handbook of Microwave Integrated Circuits,” Springer-Verlag, 1983, pp. 90-91.
Beez Thomas
Bird John
Dawson David Neil
Dennerlein Gerd
Dutzi Joachim
Kenyon & Kenyon
Lee Benny
Robert & Bosch GmbH
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