Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1988-08-08
1990-10-30
LaRoche, Eugene R.
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333108, 333258, H01P 110
Patent
active
049671707
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a waveguide switch of the type including a housing having an axial bore and provided with at least four waveguide ports which each communicate with the bores have a rectangular cross section and which are all arranged in one plane transverse to the longitudinal axis of the bore and at right angles to one another, a cylindrical rotor disposed in the bore of the housing and provided with three waveguide passages having a corresponding rectangular cross section so as to produce different waveguide connections between the waveguide ports in certain rotor positions, with one of the waveguide passages being configured as a straight central passage and with the other of the waveguide passages being disposed on respectively opposite sides of the straight waveguide passage and each producing a deflection of the waveguide path by 90.degree..
Such a switch is known, for example, from DE-OS 3,441,728. In this prior art waveguide switch, the rotor is provided with three waveguide passages which are parallel to one another. Although the manufacture of such waveguide passages is rather simple, it has been found that, particularly at the junctions between rotor and stator, the bend in the waveguide path produces relatively high reflections. To improve transmission characteristics, it is advisable to give the two outer waveguide passages an arcuate shape (similarly to the configuration in DE-OS 2,924,969). However, the small dimensions of a miniaturized waveguide switch do not permit such an arcuate configuration.
SUMMARY OF THE INVENTION
According to the present invention, a waveguide switch of the above described type is modified in that: the straight central waveguide passage is given a cross-sectional taper toward the center of the rotor from each end; and the other waveguide passages each have an at least approximately arcuate shape with the respective faces of the longitudinally extending walls of the rotor which delimit these other waveguide passages each being formed of at least three planar face pieces with bends therebetween to approach the arcuate shape.
In contrast to the know waveguide switches of this general type, the waveguide switch according to the invention has the advantage that the taper in the longitudinal passage permits the other two waveguide passages to be given an arcuate shape, with the radius of the rotor remaining small, thus enabling the delimiting walls to be formed of planar face pieces which approach the arc. In this way, the reflection of the other two waveguide passages approaches that of the longitudinal passage.
In one embodiment of the invention, it is proposed to arrange the cross-sectional taper of the longitudinal passage in the manner of steps, similar to a .lambda./4 transformation, or to configure the cross-sectional taper of the waveguide without steps, which is more favorable for broadband transmission. Although the cross-sectional taper creates somewhat higher reflections in the longitudinal passage, such reflections are relatively slight; the important factor is the significantly improved transmission characteristic of the other two waveguide passages and that this is realized with a rotor diameter which remains small and thus permits small switch dimensions.
Forming the other waveguide passages by means of a plurality of planar face pieces provides, in addition to an improvement in transmission characteristics, also for simplification of the manufacture of the rotor.
Another feature of the invention is that so-called chokes are disposed on the rotor between the waveguide passages, in a known manner, to effect crosstalk attenuation between the individual signals to be transmitted.
Other advantages of the invention will become evident from the description and from the dependent claims
The invention will now be described in greater detail with reference to one embodiment thereof
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic cross-sectional representation of a prior art four-position switch (R switch) in its
REFERENCES:
patent: 2769144 (1956-10-01), Walters
patent: 3072870 (1963-01-01), Walker et al.
patent: 3123736 (1964-03-01), Christoffers et al.
patent: 3189850 (1965-06-01), Walker et al.
patent: 4761622 (1988-08-01), Cracknell et al.
patent: 4806887 (1989-02-01), Au-Yeung
Montgomery, C. G., et al., "Principles of Microwave Circuits"; Copyright 1948, McGraw Hill Book Co., Inc.; N.Y., U.S.A.; pp. 188-192.
Hettlage Eckart
Ruff Gerd
LaRoche Eugene R.
Lee Benny
Teldix GmbH
LandOfFree
Rotary waveguide switch having arcuate waveguides realized by pl does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rotary waveguide switch having arcuate waveguides realized by pl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotary waveguide switch having arcuate waveguides realized by pl will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-277208