Arizona State University

E-tenna Corporation

James T Aberle

Lawrence T Clark

William E McKinzie, Iii

Bertan Bakkaloglu

David R Allee

Terry L Alford

Constantine A Balanis

Kevin Baugh

Hang Song

Embodiments of flexible identification systems are described herein. Other embodiments and related methods are also disclosed herein.

Flexible identification systems and related methods

A closed-loop controlled antenna tuning unit (ATU) system includes a return loss detector connected to sample an RF signal generated by a signal source to provide a return loss signal. A matching state searching circuit is connected to receive the return loss signal and, in response, selectively store a return loss value and an impedance matching state. A central controller is connected to provide a switch control signal and apply an optimum matching state to the impedance synthesizer at the conclusion of the matching state search. An impedance synthesizer is responsive to the switch control signal for coupling a radio frequency signal and matching the impedance of an antenna to a signal source.

Automatic antenna tuning unit for software-defined and cognitive radio

An antenna comprises a conductive member having an opening for radiating an electromagnetic signal. A circuit board is spaced apart from the conductive member by less than one-quarter wavelength of the electromagnetic signal. The circuit board has a series of conductive cells for suppressing at least one propagation mode propagating between the conductive member and circuit board over a frequency bandwidth range defined by a geometric arrangement of the conductive cells.

Aperture antenna having a high-impedance backing

Growing community of inventors

Tempe, AZ, United States of America

James T Aberle