Abstract An evanescent H-mode rectangular waveguide resonator having a tuning screw mounted on one broad wall is temperature compensated by having said screw physically penetrate close to the opposite broad wall of said waveguide. Said penetration provides significant end-loading capacitance. In one preferred embodiment, said screw is offset from the longitudinal centerline of said waveguide to achieve both the required tuning capacitance and the required penetration. In another preferred embodiment, to further improve temperature compensation, a silver-plated Swedish iron screw having a lower coefficient of expansion than the material of the waveguide, (i.e., copper) penetrates close to the opposite broad wall.
Inventors
👤 Kenneth George Hodgson
👤 George Frederick Craven
👤 Raymond Richard Thomas
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-27 15:06
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/219
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
59 words
A temperature-compensated resonator comprising a section of evanescent H-mode waveguide and a single capacitive tuning screw on the broad longitudinal center line of said section of evanescent H-mode waveguide for providing significant end-loading capacitance, said tuning screw is of a material having a lower coefficient of expansion than that of the material of said section of evanescent H-mode waveguide.
Claim 2
Dependent Claim
59 words
A temperature-compensated resonator comprising a section of evanescent H-mode waveguide and a single capacitive tuning screw on the broad longitudinal center line of said section of evanescent H-mode waveguide for providing significant end-loading capacitance, said tuning screw is of a material having a lower coefficient of expansion than that of the material of said section of evanescent H-mode waveguide.
Claim 3
Dependent Claim
26 words
A temperature-compensated resonator, according to claim 1, wherein said waveguide section is made of copper and wherein said tuning screw is made of silver-plated Swedish iron.