USA as Represented by Secretary of the Navy

Government of the United States

Emanuel Briguglio

A microwave repeater with antenna isolation comprises a first receiving anna for receiving an input signal from a distant source; an amplifier section for amplifying and modulating the input signal to produce an output signal; a transmitting antenna coupled to the amplifier section; and an isolation control means including a second receiving antenna for isolating the first receiving antenna from the transmitting antenna. In one preferred embodiment, the second receiving antenna is aligned so as to match the gain and phase from the transmitting antenna to the first receiving antenna. The isolation control means comprises a phase shifter coupled to the second receiving antenna; and a power combiner having inputs coupled to the first receiving antenna and the phase shifter and an output coupled to the amplifier section. The power combiner receives the input signal from the first receiving antenna and a 180.degree. phased shifted signal from the phase shifter.

Microwave repeater with broadband active and/or passive isolation control

A surface floating buoy has an antenna attached to a linkage system which pivots about the floating buoy. The linkage system is attached to a counterweight such that the antenna is maintained at a desired vertical position with respect to the surface of a body of water by pantographic action. The floating buoy contains a hollow cavity of sufficient size to hold the linkage system antenna and counterweight prior to deployment in a body of water. Upon deployment in the water, gravitational forces on the counterweight and linkage system cause the system to be deployed. The invention may also include a servo feedback system for more accurately positioning the antenna at its desired position.

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Bethesda, MD, United States of America

Emanuel Briguglio