Patent attributes
A polarization switching/variable directivity antenna according to the present invention includes a radiation conductor plate 12 on a front face, and a ground conductor plate 14 on a rear face, of a dielectric substrate 11. At least one directivity switching element and at least two polarization switching elements are provided within the ground conductor plate 14 on the rear face. The directivity switching element includes a first slot which is formed by a removing a loop-like portion from the ground conductor plate 14 and at least two directivity switching switches (22a to 22d). Each polarization switching element includes a first slot which is formed by removing a loop-like portion from the ground conductor plate 14 and at least one polarization switching switch (23a to 23d). Switching of a maximum gain direction of radiation directivity of the antenna is realized through control of the directivity switching switches 22a to 22d, and switching of the rotation direction of a circularly polarized wave which is emitted from the antenna is realized through control of the polarization switching switches 23a to 23d.
