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Rotary waveguide switch having arcuate waveguides realized by planar faces
| Details |
Inventors: Hettlage, Eckart; Ruff, Gerd;
Assignee: Teldix GmbH (Heidelberg, DE)
Primary Examiner: LaRoche; Eugene R.
Assistant Examiner: Lee; Benny
Attorney, Agent or Firm: Spencer & Frank
A waveguide switch with four outputs or inputs (A, B, C, D) normally has one rotor (2) with three passages (3, 4, 5) with which, as appropriate, two waveguide connections can be effected in specific rotor positions. In two switching positions only the central waveguide passage (3) conducts HF signals, whereas in the two other switching positions both curved passages (4, 5) simultaneously conduct HF signals. Whereas the transmission losses in the central passage are low, a very high reflection level has hitherto been obtained in the two curved passages because of the points of inflexion. In order to improve the transmission characteristics, it is proposed to design the curved passages with an elliptical shape. For this, the longitudinal passage (3) is narrowed toward the central point of the rotor, so that sufficient space is provided for the curved portion of the lateral passages. The circular shape of the curved passages (4, 5) can also be approximated by a facet-like shaping of the sidewalls. The points of inflexion (8 or 9) thus created result in only insignificant changes in the transmission characteristics. |
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DETAILED DESCRIPTION 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
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Telecommunications 
