Phase stable waveguide assembly

Details Phase stable waveguide assembly Phase stable waveguide assembly

2005-05-24

2005-05-24

Cho, James H. (Department: 2819)

Wave transmission lines and networks

Resonators

Cavity resonator

C333S234000

Reexamination Certificate

active

06897746

ABSTRACT:
A waveguide assembly for operation over a range of temperatures includes a waveguide body and a plurality of restraining strips coupled to the waveguide body. The waveguide body includes a pre-curved narrow sidewall of material having a first coefficient of thermal expansion (CTE). The restraining strips are coupled to the waveguide body at first and second lateral points on either side of the pre-curved narrow sidewall laterally and are spaced apart along the length of the waveguide body, and are made from a material having a second CTE much less than the first CTE. Thus, when the temperature of the waveguide assembly changes, the restraining strips maintain a substantially constant lateral distance between said first and second lateral points over the range of temperatures such that as the length of the waveguide varies with temperature, the curvature of the pre-curved narrow sidewall also changes, causing the effective large dimension of the waveguide assembly to vary such that the combination of said changes results in a constant phase length for said waveguide body.

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D. Eatly, “The Mechanical Strength and Stiffness of Pressurized Microwave Devices”, The Marconi Review, First Quarter, pp. 44 to 61. 1975.

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