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A beam-switchable dipole antenna

The paper proposes a new beam-switchable dipole antenna. The functionability is realized by reconfiguring the state of the four side apertures of a square substrate integrated waveguide (SIW). Four wide dipoles are loaded in front of the four apertures. The selected radiating aperture is able to excite the corresponding loaded dipole. The other dipoles work as reflectors. Thus, directional radiation patterns can be obtained in each state. Owning to its symmetrical structure, the proposed antenna is capable of switching the radiation beam every 90° with identical radiation patterns in the H-plane. An impedance bandwidth of approximately 50% for S11 < −10 dB is achieved with an antenna gain of approximately 4.3 dBi for each state.