Radar frequency spectrum control circuit

Claim 2

In a radar system including an antenna from which pulses of radio frequency energy are radiated, the frequency of such energy being substantially constant, and a power oscillator for producing pulses of radio frequency energy, the frequency spectrum of such energy in each one of such pulses being greater than the frequency spectrum of the radio frequency energy in each corresponding one of the radiated pulses, a radio frequency spectrum control circuit comprising; a. first hybrid junction means for dividing the radio frequency energy in each pulse thereof produced by the power oscillator into two substantially equal portions and directing each one of such portions through a separate transmission path; b. phase shifting means, disposed in at least one of such paths, for changing the phase of radio frequency energy passing therethrough in accordance with a control signal; c. control signal generating means, responsive to each one of the pulses of radio frequency energy from the power oscillator, for producing the control signal; and d. second hybrid junction means for combining the radio frequency energy in the separate transmission paths and directing such combined energy to the antenna when the control signal exists.

Claim 3

A radio frequency control circuit as in claim 1 wherein the phase shifting means includes a first and a second phase shifter, disposed respectively in one of the separate paths, one such phase shifter being disposed, in the absence of a control signal, to advance the phase of radio frequency energy passing therethrough by 90*and the other such phase shifter being disposed, in the absence of a control signal, to retard the phase of radio frequency energy passing therethrough by 90*.

Claim 4

In a radar system including an antenna from which pulses of radio frequency energy are radiated, the frequency of such energy being substantially constant, and a power oscillator for producing pulses of radio frequency energy, the frequency spectrum of such energy in each one of such pulses being greater than the frequency spectrum of the radio frequency energy in each corresponding one of the radiated pulses, a radio frequency spectrum control circuit comprising: a. first hybrid junction means for dividing the radio frequency energy in each pulse thereof produced by the power oscillator into two substantially equal portions and directing each one of such portions through a separate transmission path; b. phase shifting means, responsive to a control signal, for selectively changing the phase of the radio frequency energy in each one of such portions thereof, such phase shifting means including a first and second phase shifter disposed, respectively, in one of the separate paths, the first phase shifter being adapted, in the absence of a control signal, to advance the phase of radio frequency energy passing therethrough by 90*and the second phase shifter being adapted, in the absence of a control signal, to retard the phase of radio frequency energy passing therethrough by 90*; c. control signal generating means, responsive to each one of the pulses of radio frequency energy from the power oscillator, for producing a control signal for the first and the second phase shifter thereby to shift the phase of radio frequency energy passing through each one of such phase shifters to make the radio frequency energy in the two substantially equal portions thereof ''''in phase''''; and, d. second hybrid junction means, responsive to the two substantially equal portions of the radio frequency energy for combining the radio frequency energy in the separate transmission paths and directing such combined energy to the antenna when the control signal exists.

Claim 5

In a radar system including an antenna from which pulses of radio frequency energy are radiated, the frequency of such energy being substantially constant, and a power oscillator for producing pulses of radio frequency energy, the frequency spectrum of such energy in each one of such pulses being greater than the frequency spectrum of the radio frequency energy in each corresponding one of the radiated pulses, a radio frequency spectrum control circuit comprising: a. first hybrid junction means for dividing the radio frequency energy in each pulse thereof produced by the power oscillator into two substantially equal portions and directing each one of such portions through a separate transmission path; b. phase shifting means, responsive to a control signal, for selectively changing the phase of the radio frequency energy in each one of such portions thereof, such phase shifting means including a first and second phase shifter disposed, respectively, in one of the separate paths, the first phase shifter being adapted, in the absence of a control signal, to advance the phase of radio frequency energy passing therethrough by 90*and the second phase shifter being adapted, in the absence of a control signal, to retard the phase of radio frequency energy passing therethrough by 90*; c. control signal generating means, responsive to each one of the pulses of radio frequency energy from the power oscillator, for producing a control signal for the first and the second phase shifter thereby to shift the phase of radio frequency energy passing through each one of such phase shifters to make the radio frequency energy in the two substantially equal portions thereof ''''in phase''''; and, d. second hybrid junction means, responsive to the two substantially equal portions of the radio frequency energy for combining the radio frequency energy in the separate transmission paths and directing such combined energy to the antenna when the control signal exists.