Amplifiers – Parametric amplifiers
Reexamination Certificate
1999-12-16
2001-07-24
Pascal, Robert (Department: 2817)
Amplifiers
Parametric amplifiers
C330S004600, C330S004900, C333S218000
Reexamination Certificate
active
06265934
ABSTRACT:
BACKGROUND OF THE INVENTION
In certain applications, it is difficult to obtain required microwave energy signals because of restrictions in energy sources, weight and the available volume for such equipment. Such limitations are frequently present in applications involving microwave equipment used in missiles, airplanes, and satellites. In general, it is more difficult to produce microwave signals as the frequency of the required signal increases. One method for producing a high frequency signal is to use a multiplier device such as shown in U.S. Pat. No. 5,731,752 entitled “Microwave Signal Frequency Multiplier.” Certain microwave signals are continuous and others are switched, which are typically used for producing pulses.
There exists a need for a switched, microwave amplifier which can store energy from an available microwave source and selectively release this energy as pulses when required.
SUMMARY OF THE INVENTION
A selected embodiment of the present invention is a switched microwave amplifier which includes a housing having an interior cavity. An input port is connected to the housing for providing an input signal to the interior cavity of the housing. An output port is connected to the housing for conveying an output signal from the amplifier. A pump signal port is connected to the housing for coupling a pump signal to the interior cavity of the housing. The interior cavity comprises a first cavity that is resonant with the input signal and the output signal. A non-linear medium is positioned within the first cavity for producing carriers therein in response to the pump signal. A frequency selective barrier within the interior cavity substantially reflects the pump signal and substantially transmits the input signal. The frequency selective barrier defines a pump signal resonant cavity within the housing interior cavity. An output signal is produced within the first cavity as a result of interaction of the input signal and the liberated carriers. The output signal is at the frequency of the input signal and has a greater amplitude than the input signal. A two-state switch is coupled in series with the output port wherein the switch has a first state for blocking transfer of stored energy from the first cavity and has a second state to permit release of the stored energy from the first cavity through the output port.
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Lockheed Martin Corporation
Nguyen Patricia T.
Pascal Robert
Sadacca Stephen S.
Sidley & Austin
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