A quadruple-polarization reconfigurable feeding network for an unmanned aerial vehicle (UAV) RF sensing antenna operating at 915 MHz is presented. It consists of one single-pole four-throw (SP4T) switch, one 90◦ hybrid coupler, two 180◦ hybrid couplers, and two single-pole double-throw (SPDT) switches. By controlling the SP4T and SPDT switches, quadruple polarizations with two linear polarizations (vertical and horizontal) and two circular polarizations (right-hand and left-hand) were obtained. 

[Antenna Specification]

Mode control : electrically control

Peak gain : > 6 dBi(c) at 915 MHz

HPBW (El) : 60º

Polarization : Quadruple polarization

Electrical size : 0.58λ0 (D)× 0.08λ0 (H) (D = 188mm, H = 27mm)