Eletromechanically beam steerable air-lifted antenna fed by CBCPW for WLAN applications
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An electromechanically beam steerable air-lifted antenna with a floating pillar array has been designed, fabricated, and characterized for WLAN applications. It is different from a conventional Yagi-Uda antenna, where a grounded parasitic pole longer than the driver pole is working as a reflector and ones shorter than the driver are directors, the proposed architecture has longer non-grounded (floated) poles working as directors. Since the director poles do not touch ground plane, this architecture allows the directors to freely move around the driver and steer radiation beams. A linear array of three floating pillars with a space of 0.06 λ each other, a height of 0.38 λ, a gap of 0.01 λ from ground, and a distance of 0.06 λ from the monopole is held in a piece of Styrofoam with a permanent magnet attached. The Styrofoam is rotatable in 360° in-plane scanning range around the monopole with the monopole as a rotating axis, where a permanent magnet integrated motor underneath the substrate is used to move pillars. The antenna shows a 10 dB-bandwidth of 10% and an average gain of 7 dBi with voltage standing wave ratio (VSWR) less than 2.