H - Electricity – 05 – K
Patent
H - Electricity
05
K
H05K 9/00 (2006.01) B23P 11/00 (2006.01) H01P 7/04 (2006.01) H01P 11/00 (2006.01) H01Q 15/00 (2006.01) H01Q 17/00 (2006.01)
Patent
CA 2210113
A simple joining process for members of passive microwave structures is described which reduces passive intermodulation. The process forms an aperture (28) in a first member (22) and forms a second member (24) to have dimension which exceeds the aperture dimension by a dimension differential. The members are joined by initially causing them to have a temperature differential that is sufficient to permit the second member to be positioned across the aperture. The dimension differential is selected to generate mutually-induced radial stresses in the members, after the temperature differential is removed, which enhance the metal-to-metal contact between the members and, thereby, improve passive intermodulation (PIM) performance. Preferably, the dimension differential is selected to cause the second member to elastically buckle and exert a buckling stress against the first member. Additional interface structures are provided to resist operational axial forces, e.g., vibration, that tend to dislodge the members.
Procédé simple de jonction d'éléments de structures à micro-ondes passives, permettant de réduire l'intermodulation à l'état passif (PIM). Consiste à former une ouverture (28) dans un premier élément (22) puis à former un deuxième élément (24) plus grand que l'ouverture. Pour joindre les éléments, on produit d'abord entre eux une différence de température suffisante pour que le deuxième élément puisse être placé dans l'ouverture. La différence de grandeur entre lesdits éléments est déterminée de façon à provoquer dans ceux-ci des contraintes radiales réciproques après suppression de la différence de température, ce qui améliore le contact de métal à métal entre les éléments et améliore ainsi la performance au niveau de la PIM. De préférence, la différence de grandeur est déterminée de façon que le deuxième élément subisse un flambement élastique et exerce une contrainte de flambement sur le premier élément. Des structures d'interface supplémentaires offrent une résistance aux forces axiales opérationnelles, p. ex. vibration, qui tendent à détacher les éléments.
Campbell Ronald M.
Coleman Lee E.
Grall Michael J.
He Holdings Inc.
Sim & Mcburney
The Boeing Company
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