Microwave power amplifier

Claim 2

An improved microwave power amplifier arrangement comprising: a. an input for relatively low power signals which have a center microwave frequency and which are modulated by intelligence; b. an injection locked oscillator having a free-running frequency that is substantially equal to said center microwave frequency and that can be varied by an injection frequency signal; c. a first circulator coupling said oscillator to said input so that said oscillator frequency is varied by said input signals; d. a negative resistance amplifier having an IMPATT diode that provides amplified power in response to input signals; e. a second circulator coupling said negative resistance amplifier to said oscillator so that said amplified power has the same frequency as the input signals applied to said amplifier; f. and third means coupled to said amplifier for deriving said amplified power.

Claim 3

The improved microwave amplifier arrangement of claim 1 where said third means comprise a third circulator.

Claim 4

The improved microwave amplifier arrangement of claim 1 wherein the signals applied to said arrangement input are frequency-modulated.

Claim 5

The improved microwave amplifier arrangement of claim 3 wherein said oscillator has a TED device.

Claim 6

The improved microwave amplifier arrangement of claim 3 wherein said third means comprise a third circulator.

Claim 7

The improved microwave amplifier arrangement of claim 5, and further comprising a fourth circulator coupled between said first circulator and said input, and a fifth circulator coupled between said first and second circulators, said third, fourth, and fifth circulators being arranged to reduce reflected energy.

Claim 8

An improved amplifier for use at microwave frequencies comprising: a. an input for receiving relatively low power signals having a center frequency; b. first and second circulators each having three inputs; c. an injection locked, transferred electron device Oscillator having a free-running frequency substantially the same as said center frequency; d. means respectively coupling said signal input, said oscillator, and an input of said second circulator to the three inputs of said first circulator so that said signals at said input are applied to said oscillator, and so that signals from said oscillator are applied to said second circulator; e. an IMPATT device negative resistance amplifier; f. an output for amplified signals; g. and means coupling said IMPATT amplifier and said output to the other two inputs of said second circulator so that signals from said oscillator are applied to said IMPATT amplifier and so that signals from said IMPATT amplifier are applied to said output.

Claim 9

An improved amplifier for use at microwave frequencies comprising: a. an input for receiving relatively low power signals having a center frequency; b. first and second circulators each having three inputs; c. an injection locked, transferred electron device Oscillator having a free-running frequency substantially the same as said center frequency; d. means respectively coupling said signal input, said oscillator, and an input of said second circulator to the three inputs of said first circulator so that said signals at said input are applied to said oscillator, and so that signals from said oscillator are applied to said second circulator; e. an IMPATT device negative resistance amplifier; f. an output for amplified signals; g. and means coupling said IMPATT amplifier and said output to the other two inputs of said second circulator so that signals from said oscillator are applied to said IMPATT amplifier and so that signals from said IMPATT amplifier are applied to said output.