Electronic device in which integrated antenna and filter both have balanced terminals

摘要

An antenna device is provided with a dielectric substrate comprising a large number of stacked dielectric layers and having at least an input/output terminal and a ground electrode formed on its outer circumferential surface. A plurality of ½ wavelength resonator elements of the both ends-open type are arranged in parallel to one another in the dielectric substrate respectively to construct a filter section. An antenna section is formed and constructed on the surface of the dielectric substrate. Two input/output electrodes are formed in the dielectric substrate, which are arranged at positions of point symmetry with respect to a center in the length direction of at least the resonator element disposed on the output side, of the plurality of ½ wavelength resonator elements. The two input/output electrodes are connected to balanced input/output terminals of the antenna section respectively.