Circular polarized planar printed antenna concept with shaped radiation pattern

摘要

The present invention relates to a circular polarized antenna with a dielectric substrate (11) comprising a front and a back dielectric face (12, 13), a first and a second subantenna means (14, 15), each comprising a first and a second element for radiating and receiving circular polarized electromagnetic signals, said first and second subantenna means being arranged orthogonal to each other on said dielectric substrate (11) and having essentially conjugate complex impedances, a transmission line means (18, 25, 30, 46) connected with said first and second subantenna means for transmitting signals to and from said first and second subantenna means, and a reflector means (16) spaced to and parallel with said back face (23) of said dielectric substrate (11), a low loss material (17) being located between said reflector means (16) and said back face (13). This structure provides a radiation pattern with a variable shape. Further, this antenna can be printed onto a corresponding substrate and therefor be produced at low cost.