CA2147864C

CA2147864C - Waveguide absorber

Info

Publication number: CA2147864C
Application number: CA002147864A
Authority: CA
Inventors: Klaus H. Geissler; Juergen Damaschke; Dieter Wolk
Original assignee: ANT Nachrichtentechnik GmbH
Current assignee: Bosch Telecom GmbH
Priority date: 1992-11-12
Filing date: 1993-11-08
Publication date: 1999-05-11
Anticipated expiration: 2013-11-08
Also published as: EP0669888B1; CA2147864A1; DE59303277D1; DE4238136C1; WO1994011249A1; US5610562A; EP0669888A1

Abstract

A waveguide absorber which withstands high mechanical and thermal loads is typified in that a member (4) exhibiting absorber material is clamped between waveguide walls (5, 6) in such a way that at least one wall region (5) adjoining the member (4) is constructed flexibly, and that a force acting on the flexible wall region (5) presses the latter against the member (4).

Description

Description ~ ~ ~ a ~ 4 7 8 6 4 Waveguide Absorber The present invention relates to a waveguide absorber which has at least one member inserted into a waveguide and exhibiting absorber material.

Non-reflective terminating impedances and attenuators are frequently required in microwave technology. Use is made as such of waveguide absorbers such as are disclosed, for example, in the "Taschenbuch der Hochfrequenztechnik" t"Manual of Radio-Frequency Technology"], H. Meinke and F. W.
Grundlach, 3rd edition, 1868, pages 443 to 445. This publication does not reveal the means by which the members consisting of absorber material and arranged in the waveguide are fixed.

A waveguide absorber is known from US-A-906,952, in which an absorbing member is fixed in the waveguide by means of an adhesive.

Special requirements for fixing the absorbing member are to be made for the application of waveguide absorbers in the field of space flight. The fixing is to be able to withstand high mechanical and thermal loads. It is the object of the present invention to specify a waveguide absorber of the type mentioned at the beginning which fulfils the aforementioned requirements.

According to the invention, this object is achieved by means of the features of claim 1. Advantageous developments of the invention follow from the subclaims.

The invention has the advantage that no use is made for fixing the absorbing member of the usual materials such as adhesive or solder, which often do not withstand very high thermal or mechanical stress. In addition, the...

''''.B~

7 ~ 4 7 8 ~ 4 22386-2603 mechanical outlay is very low ln the wavegulde absorber accordlng to the lnventlon.
The lnvention is explalned below wlth the ald of an exemplary embodlment represente~ ln the drawlng.
The Flgure above shows a slde vlew of a rectangular wavegulde 1 whlch ls provlded at one end wlth a flange 2, and whose other end ls sealed by a cover 3. Inserted lnto thls wavegulde 1 ls a member 4 whlch conslsts at least ' ~3 3 21~7864 partially of a thermostable absorber material (for example, silicon carbide). The member 4 extends with a subregion over the entire height of the waveguide and has the shape of a wedge. The absorber member can have any arbitrarily differen~ shape; it depends, ~or example, on the electrical requirements and on the mounting position in the waveguide. All that is decisive is that the member extends at least partially over the entire height of the waveguide (or the entire diameter of the waveguide in the case of a round waveguide), so that it can be clamped between mutually opposite wall regions of the waveguide.
In order to fix the member 4 in the waveguide 1 by clamping, the thickne3s of one waveguide wall S is so strongly reduced at least in the region resting on the member 4 that this re~ion is flexible. If a pressure is exerted on this flexible wall region 5, the member 4 is pressed against the opposite rigid waveguide wall 6. The result is a contact, which conducts heat well, between the member 4 and this waveguide wall 6 on whose outside a cooling system, for example a heat pipe, is arranged in accordance with the illustrated exemplary embodiment.
A pressure clamp 8 lying on the flexible wall region 5 is fastened by means of screws 9 to the opposite waveguide wall 6. By means of these fastening screws 9 themselves, either the pressure clamp 8 can be tensioned so far that it exerts the required clamping pressure on the flexible wall region 5, or it is possible apart from the fastening screws 9 to provide in addition in the pressure clamp 8 screws which can be screwed against the flexible wall region 5.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A waveguide absorber which has at least one member inserted into a waveguide and exhibiting absorber material, wherein the member (4) is clamped between waveguide walls (5, 6) by providing that at least one wall region (5) resting on the member (4) is constructed flexibly, and that a force acting on the flexible wall region (5) presses the flexible wall region against the member (4).

2. The waveguide absorber as claimed in claim 1, wherein the flexible wall region (5) is realized by an appropriately strong reduction in the wall thickness.

3. The waveguide absorber as claimed in claim 1 or 2, wherein provision is made of a pressure clamp (8) which exerts the clamping pressure on the flexible wall region (5), rests on the flexible wall region (5) and is screwed to a wall region (6) of the waveguide (1) which is opposite said flexible wall region.

4. The waveguide absorber as claimed in claim 3, wherein the clamping pressure is produced by a correspondingly tight screwing of the pressure clamp (8) to the opposite wall region (6).

5. The waveguide absorber as claimed in claim 3, wherein arranged in the pressure clamp (8) are screws which can be screwed against the flexible wall region (5) in order to be able to produce the clamping pressure.