Application of single point feeded wide band circularly polarized coplanar antenna

In the communication of vehicles or mobile phones, the radio wave comes from any direction with variety of polarization. Therefore, the antenna which has omni-directional and polarization independence characteristics is required. In addition, good design and a low cost are required. As a glass antenna is produced by printing method, which is suitable for mass-production, a glass antenna has advantage in the shape and the cost to the roof antenna. However, since a glass antenna is constructed on a glass surface, it couldn´t apply multilayer structure like a MSA. Therefore, it is difficult to design for a circular polarization antenna, which is required under the multipath propagation environment. There are varieties of polarizations such a multipath field.