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US 4,309,706 AGranted
Wideband direction-finding system
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorJoseph A. Mosko
Life of this patent
Estimating the term…
Abstract
A wideband direction finding system consisting of a spiral antenna and an ray of towel bar antennas coupled together and driven from a single source and designed to operate over a wide band of frequencies as a circularly-polarized, two-channel mono-pulse system.
Claims9
A wideband direction-finding antenna system comprising;
- a substantially cylindrical body having end portions;
- a multi-arm spiral antenna mounted on one end portion of said body;
- each arm of said multi-arm spiral having one end terminating at an inner circumference and another end terminating at an outer circumference;
- coupling means associated with each arm of said multi-arm spiral and connected to the end of each arm terminating at the outer circumference of the spiral;
- said coupling means each having at least one input port and at least two output ports to provide a power split and predetermined phase relationship at said output ports;
- said at least one input port being connected to the end of the associated arm at the outer circumference;
- at least one pair of towel bar antennas connected to said at least two output ports of each of said coupling means associated with each arm of said multi-arm spiral;
- so that said antenna system is operative to provide combined .SIGMA. and .DELTA. modes across a wide range of frequencies.
5 more elements
Dependencies are inferred from the claim text.