A Hybrid Reconfigurable Antenna Design for Cognitive Radio System—Combination of Sensing and Reconfigurable Antennas

Abstract

This paper presents a modification of an existing cognitive antenna design which contains two antennas: one is a sensing that covers the band from 1-11 GHz and the other is a hybrid triangular reconfigurable antenna. Two antennas are combined together to create a new design which called Cognitive Antenna. The new shape of the reconfigurable antenna will affect the cognitive antenna so as to work at two different frequencies via rotation by 180˚. At each rotation, the antenna takes single frequency from number of possible frequencies that sensing antenna would find.