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Radiation pattern reconfigurable antenna design using characteristic modes

Abstract:

In this paper, a radiation pattern reconfigurable antenna is presented, which is able to switch between a bidirectional and a unidirectional radiation pattern. The proposed antenna is conceived from the characteristic mode analysis of two parallel metallic plates, with the same and different sizes. By means of two PIN diodes, the size of the lower plate of the two parallel metallic plates can be modified, changing the behavior of the radiation pattern. During the ON/OFF switching, the operating frequency is shifted, what is solved by introducing a varactor diode in the antenna. Thus, the operating frequency is adjusted for the switching state.