What are dextral and left-handed?

Right rotation and left rotation do not refer to the tightening direction of the antenna joint, but to a polarization characteristic of the antenna.

Circular polarization occurs when the included Angle between the polarization plane of radio waves and the earth normal plane changes periodically from 0 to 360 degrees, that is, the size of the electric field is unchanged, the direction changes with time, and the trajectory of the end of the electric quantity vector is projected as a circle on the plane perpendicular to the propagation direction. Circular polarization can be obtained when the amplitude of the horizontal and vertical components of the electric field is equal and the phase difference is 90 degrees or 270 degrees. Circular polarization, if the polarization surface rotates with time and the direction of electromagnetic wave propagation into a right spiral relationship, called right circular polarization; Conversely, if a left spiral relationship, said left circular polarization.

（LHCP） 

（RHCP）