Temperature compensated microwave filter

Details Temperature compensated microwave filter Temperature compensated microwave filter

1976-08-05

1978-09-05

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 73W, 333 73S, 333 83T, H01P 706, H01P 120, H01P 130

Patent

active

041123980

ABSTRACT:
A lightweight microwave filter device is disclosed which utilizes a housing made of a lightweight metal such as aluminum having a relatively large coefficient of thermal expansion. The microwave filter also utilizes resonator elements which are either interdigital or in a comb-line filter arrangement. The resonator rods are made in two segments -- a lightweight metal such as aluminum having a relatively large coefficient of thermal expansion and a metal having a very low coefficient of thermal expansion such as invar. As the temperature varies the length of the rod also varies. The tuning capacitance between the rods and the housing varies with temperature changes and compensates for the change in the rod length. Thus the resonant frequency of the microwave filter is maintained relatively constant over a predetermined temperature range.

REFERENCES:
patent: 3348173 (1967-10-01), Matthaei et al.
patent: 3601719 (1971-08-01), Hodgson et al.
patent: 3733567 (1973-05-01), Johnson
patent: 3818389 (1974-06-01), Fisher

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