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| Number | Title | Issue Date |
| 7688263 | Volumetric direction-finding system using a Luneberg Lens Disclosed is an Radio Frequency (RF) receiving system methodology, utilizing an Luneberg Lens having a spherically shaped outer surface and a semi-spherical shaped focal surface composed of near-equally spaced frequency-independent antenna elements disposed uniforml... | 03/30/2010 |
| 7212120 | Work site tracking system and method A system for tracking entities at a work site includes an antenna having a scanned boresight. A controller may be configured to determine a relative angle between a reference associated with the antenna and a source of radiation based on a relationship between bores... | 05/01/2007 |
| 4591862 | Monopulse receiver for a four arm log spiral antenna A method of apparatus for determining the rectangular coordinate direction angles of a source of radio signals received by a four arm log spiral antenna and then processed by a beam-forming network to simultaneously generate both sum and difference modes.... | 05/27/1986 |
| 4366483 | Receiver and method for use with a four-arm spiral antenna A receiver for locating a source of RF radiation received by a four-arm spiral antenna having an angular measurement frame normal to the antenna axis, including a detection circuit for detecting signals received from each of the spiral arms in response to... | 12/28/1982 |
| 4309706 | Wideband direction-finding system 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 ... | 01/05/1982 |
| 3949407 | Direct fed spiral antenna A direct fed spiral antenna element array is disclosed for radiating electromagnetic energy. Each antenna element is a multi-arm spiral element having inner and outer ends. Phase shifting is obtained with internal phase control wherein switching means ser... | 04/06/1976 |
