| 摘要 |
A magnetron includes a cylindrically shaped cathode having an electron emitting surface and a filamentary heater adapted to raise the temperature of the emitting surface sufficient to permit thermionic electron emission therefrom. The filamentary heater comprises a first filament support member having an axial shaft coaxially disposed within the support sleeve and is coupled at an end thereof to a portion of the support sleeve. The first filament support member has a plurality of first tines extending from an opposite end of the axial shaft. A second filament support member has an axial shaft coaxially disposed within the support sleeve along a common axis with the axial shaft of the first filament support member. The second filament support member has a plurality of second tines extending from an end of the axial shaft in substantial alignment with the first tines. A plurality of wire helixes are coupled between the first and second filament support members, with each respective one of the wire helixes being connected between corresponding ones of the first and second tines. A filament spacer is coupled to each of the plurality of wire helixes at a point intermediate the first and second tines. The filament spacer causes the plurality of wire helixes to bow inwardly at the coupling point with the spacer so as to prevent the wire helixes from shorting against the internal surface of the cathode due to the thermal expansion.
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