| 摘要 |
A plural cavity structure (10), suitable for use as a microwave filter (34, 34A, 34B) , has plural cavities (24, 26, 28, 30) disposed within a cylindrical aluminum housing (12) and having a central planar transverse wall (18) including an iris (38) for coupling of electromagnetic power between two successive ones of the cavities (28, 26). The transverse walls are bowed, and peripheral regions of the walls are clamped by metallic rings (66, 68, 70, 72) differing in their coefficients of thermal expansion. Thus, the rings (68, 70) of the inboard transverse walls (16, 20) are formed of titanium having a relatively high coefficient of thermal expansion, while the rings (66, 72) of the outboard transverse walls (14, 22) are formed of INVAR having a relatively low coefficient of thermal expansion. As a result of the differing coefficients of thermal expansion, the outer transverse walls experience greater deformation than do the inner transverse walls with changes in environmental temperature resulting in a net decrease in axial length of both inboard and outboard cavities upon an increase in environmental temperature.
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