Broadband millimeter wave amplifier
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorDavid Rubin
Life of this patent
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Abstract
A millimeter wave amplifier having broadband characteristics in which a G diode or other two terminal negative resistance device having an integral heat sink is center mounted in a reduced height waveguide. The heat sink is attached to a mechanism for selectively adjusting its penetration into the waveguide cavity. The introduction of the heat sink into the waveguide cavity creates a discontinuity to the propagation of energy which causes localized waveguide modes other than the dominant mode to exist. The adjustable position of the heat sink allows the reactance due to the introduction of these modes to be variable, proper adjustment resulting in the cancellation of the parasitic reactances inherent in the packaged negative resistance device.
Claims10
A millimeter wave amplifier comprising:
- a reduced height waveguide section having top and bottom walls and a waveguide cavity;
- a packaged two terminal negative resistance device having a heat sink integral therewith positioned intermediate said top and bottom walls;
- first means secure to said two terminal negative resistance device for externally, selectively adjusting the depth of penetration of said heat sink into said cavity and for presenting said heat sink as a discontinuity to the propagation of energy waves within said cavity such that said heat sink can be positioned within said cavity at any required depth of penetration so as to effectuate cancellation of the parasitic reactances caused by said packaged two terminal negative resistance device.
In a millimeter wave amplifier including a reduced height waveguide and a packaged two terminal negative resistance device operating within the cavity of said waveguide to achieve a reflection gain, said packaged two terminal negative resistance device having a heat sink integral with the device package, the method of minimizing the parasitic reactances exhibited by the device and its packaging comprising the step of:
- adjusting the depth of penetration of said integral heat sink into said waveguide cavity such that said heat sink presents a discontinuity to the propagation of energy waves within said cavity and such that the reactances caused by said discontinuity cancel said parasitic reactances exhibited by said device and its packaging.
Dependencies are inferred from the claim text.