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Band-Reconfigurable Unidirectional Antenna: A simple, efficient magneto-electric antenna for cognitive radio applications.

A band-reconfigurable antenna is proposed with one wideband mode (0.83-2.16 GHz) and four narrowband modes. The wideband mode is based on ME dipole technology, and the narrowband modes are realized by a length-reconfigurable thin dipole. By using ME dipole technology, stable gains and well-controlled radiation patterns are achieved together with other benefits, such as high efficiency and simple structure. To demonstrate the functionality of the antenna, a prototype was fabricated with good measured performance. With the frequency selective feature, unidirectional patterns, and high efficiencies, the antenna finds potential applications in future wireless communications, such as CR.