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AssigneeU.S. Army Research Laboratory ATTN: RDRL-LOC-I
InventorsFa Foster Dai, Geoffrey Goldman
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An RF system comprising of outputs to an electronically scanning antenna for radiating electromagnetic energy; at least one waveform generator; two multiphase phase-locked loops integrated with the waveform generator, the phase locked loops operating to provide multiple shifted phases to a waveform. Optionally, the two multiphase phase-locked loops may each be divided down by a bank of frequency dividers to further increase the number of phase shifts. The phases generated from each multiphase phase-locked loops are selected with multiplexers then mixed together. These upper or lower sidebands are then mixed with the up converted waveform which results in a phase shift for the waveform associated with each antenna element.
A system comprising:
The system of 5 wherein the waveform generator outputs a first signal, and wherein the upper and lower sidebands are combined and inputted into third mixers, the third mixers operating to provide either the sum or difference between the combined signal and the first signal.
The system of claim 12 wherein the voltage controlled oscillators comprise an m-phase voltage controlled oscillator and an n-phase voltage oscillator, where m and n are integers, and wherein the second frequency dividers have divider ratio of I=2k, and whereby the number of available phases output by the second frequency dividers is increased to m*I and n*I, respectively.
A system for providing multiple-direction electromagnetic signals, the multiple directions being controlled by the phase of the signal, the system comprising:
Dependencies are inferred from the claim text.