Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1995-06-07
1996-12-31
Lee, Benny
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333229, 333234, H01P 1208, H01P 706
Patent
active
055898076
ABSTRACT:
Multi-mode waveguide filters are temperature compensated using dielectric material contained within at least one cavity of a filter. The variation in operating frequency of the filter that would otherwise result from changes in temperature is substantially balanced by a change in operating frequency with temperature caused by a change in a dielectric constant of the dielectric material so that the operating frequency of the filter remains substantially constant with temperature. The filter can have one or more dual-mode or triple-mode cavities. In a method of constructing and compensating a filter, the amount of dielectric material is selected so that the dielectric material does not resonate at the operating frequency of the cavity, the amount of dielectric material in the cavity being adjustable after each cavity is constructed. The cavity is operated with a fixed amount of dielectric material contained in the cavity for each mode and the change in operating frequency of the filter with temperature is determined. If the change in operating frequency of the filter is not at an acceptable level, the amount of dielectric material contained in the cavity for each mode is varied and the filter is operated through a range of temperatures to determine whether the change in operating frequency is then at an acceptable level. These steps are repeated until the change in operating frequency of the filter is at an acceptable level.
REFERENCES:
patent: 2475035 (1949-07-01), Linder
patent: 4060779 (1977-11-01), Atia et al.
patent: 4644305 (1987-02-01), Tang et al.
patent: 5012211 (1991-04-01), Young et al.
Bettendorf Justin P.
Com Dev. Ltd.
Lee Benny
Schnurr Daryl W.
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