A circularly polarized wave antenna device that has improved the orthogonality of two radiation electric fields in a degeneration-separated mode. A radiation conductor is formed on one main surface of a substrate, and a ground conductor is formed on the other main surface of the substrate opposite to...http://www.google.de/patents/US6437744?utm_source=gb-gplus-sharePatent US6437744 - Circularly polarized wave antenna device
