Questech Corporation

Dylor Corporation

Leonard Baker

Ira Jeffrey Bush

James H Cole

A beam electronically steers, in real time, a multielement sensor array at radio frequencies. A sensor array is configured in one embodiment with orthogonal loops and orthogonal dipole elements. Each loop and dipole combination generates a polarized output signal which is routed, via a connection matrix, to an equal number of signal splitters. The resulting modal patterns are then routed to networks having quad hybrids and digitally user-controllable vector modulators. The signals outputted from the quad hybrids and the vector modulators of each of the networks are inputted to separate combiners. The signals outputted from the separate combiners of the networks are then recombined in combiners. The signals outputted from these combiners define the azimuth around the Z-axis, the elevation around the Y-axis, and the elevation around the X-axis, respectively. These signals are finally combined in a signal combiner, which output is only then sent to one or more receivers, after further filtering and amplifying, if desired.

Enhanced electronically steerable beam-forming system

An electronic receiver circuit for receiving and amplifying optical signals is disclosed. The optical signal is applied to a photodiode which generates a current signal that passes through a source load with a high resistance or impedance relative to the impedances associated with the desired bandwidth of the optical signal. The current signal is amplified and buffered by an amplifier circuit which can drive low output impedances while maintaining the proper voltage level on the high impedance source load. The receiver circuit also maintains a wide signal bandwidth from RF to microwave frequencies, holds pre-amplifier distortion to very low levels and still yields a high signal-to-noise ratio.

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Bethesda, MD, United States of America

Leonard Baker