Patent ID: 6044538
Filing Date: 2000-04-04
Classification: H01P,Y10T

Abstract:
A method of reducing passive intermodulation in a microwave filter, comprising the steps of:providing a microwave housing and a microwave stub within said housing wherein said housing and said stub are arranged and dimensioned to resonate for microwave signals of a predetermined wavelength;providing an aperture in said housing wherein said aperture has an aperture periphery and an aperture dimension across said aperture;providing a lid that has a lid periphery and a lid dimension across said lid which exceeds said aperture dimension by a dimension differential;providing one of said aperture periphery and said lid periphery with a beveled edge;providing the other of said aperture periphery and said lid periphery with a slanted face;causing said housing and said lid to have a temperature differential that is sufficient to permit said lid to be positioned across said aperture with said lid periphery within said aperture periphery;removing said temperature differential; andselecting said dimension differential to be sufficient, when said temperature differential removing step is completed, to abut said beveled edge and said slanted face and elastically buckle said lid to thereby generate mutually-induced stresses in said housing and said lid that reduce passive intermodulation.