Wide band co-planar waveguide feeding circularly polarized antenna

A wide band co-planar waveguide feeding circularly polarized antenna, comprising:

• a substrate having a surface;
• a signal feeding unit located on the surface and comprising a feeding bar, a matching portion, a first extended portion, and a second extended portion;
• a first ground unit located on the surface and having a first ground bar;
• and
• a second ground unit located on the surface and having a second ground bar;
• and
• a ring portion located on the surface of the substrate, and the feeding unit, the first ground unit and the second ground unit being surrounded by the ring portion;
• wherein, the first extended portion and the second extended portion are respectively extended from the matching portion;
• the matching portion is electrically connected with the feeding bar, the first extended portion and the second extended portion;
• and the feeding bar is located between the first ground bar and the second ground bar.