A Novel Antenna with Reconfigurable Patterns Using H-Shaped Structures

A novel pattern reconfigurable antenna is proposed in this letter by introducing a unique finite periodic structure. The H-shaped units are precisely arranged on the both sides of the dipole to direct the power flowing in the end-fire direction. When the antenna operates with the PIN diodes between the units, different radiation patterns can be easily achieved by changing the states of these PIN diodes. The prototype of the pattern reconfigurable antenna with three patterns is fabricated and measured. The experimental results show that the end-fire mode of the antenna has a front-to-back ratio as high as 15 dB and the pattern reconfigurable capability is successfully achieved in the band of 2.47-2.9 GHz.