Wheel antennas are a group of antennas consisting of a number of loops rotated equally around a feed point. The horizontally-polarized Big Wheel consists of 3 loops which are all orientated parallel to the horizon. Omnidirectional circular polarization can be achieved by twisting the elements to a 45 degree angle to the horizon. The most popular configurations are the 3 element, better known as the Clover leaf antenna, and the 4 element, better known as the Skew planar wheel. The Clover leaf and Skew planar wheel are very popular among FPV (First Person View) enthusiasts.
The half wave arcs can be seen as half wave dipoles circularly spaced around a center point, thus creating a circular array of dipoles.Typical co-polarized 3D radiation pattern at the center frequency.... Typical S11 performance of the antenna.