Patent ID: 6677902
Filing Date: 2004-01-13
Classification: H01Q

Abstract:
A circularly polarized antenna apparatus comprising:a dielectric or magnetic substrate having a first principal surface, a second principal surface, and side surfaces; a radiating electrode provided on the substrate; a ground electrode provided on the second principal surface of the substrate; a feeding element for feeding excitation power to the radiating electrode; and a degeneracy-splitting element which causes two resonant currents to be excited in the radiating electrode, the two resonant current being split between degenerate modes; wherein the radiating electrode includes a primary radiating electrode and secondary radiating electrodes, the primary radiating electrode is provided on the first principal surface of the substrate, and the secondary radiating electrodes are provided on the side surfaces of the substrate so as to connect to the primary radiating electrode, each of the secondary radiating electrodes having substantially the same width as the primary radiating electrode.