Acs Wireless, Inc.

Delfin Systems

Thomas J Birnbaum

David Lundgren Peavey

Fred E Schader

Katherine A Tieszen

Nicholas Cianos

Timothy D Stephens

John R Conkle

An antenna includes a conductive coil electrically coupled to a wave launching structure and configured such that a plurality of capacitances act electrically in parallel with a plurality of distinct portions of the conductive coil. The capacitances configure what would otherwise be a conventional normal-mode helical antenna for operation at multiple, closely spaced resonance frequencies. The antenna operates at the multiple resonance frequencies with only a small loss of efficiency relative to the maximum response of a conventional normal-mode helical antenna that has a single resonance frequency. Also, the antenna in accordance with the invention is self-duplexing, eliminating the need for complex and expensive duplexing circuitry.

Multiple-tuned normal-mode helical antenna

An antenna configuration system for determining the bearing angle of a radio frequency signal includes a plurality of loop antennas and at least one sense antenna. Through the utilization of combining networks with the loop antennas, in-phase and out-of-phase output signals are summed with the signal from the one sense antenna. The summed signal is sent to an adaptive processing system to allow for the determination the bearing angle of the radio frequency signal.

Antenna configuration and system for determining the direction of a

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Scotts Valley, CA, United States of America

Thomas J Birnbaum