ANTENNA DEVICE

摘要

An antennal device which is of small-sized planar construction, superior in productivity, and capable of forming a main beam tilted from vertical direction to horizontal direction. In this antenna device, an antenna (105) composed of two slot elements (109a, 109b) formed on the surface of a substrate (108) by cutting a copper foil and disposed in parallel, and microstrip lines (110a, 110b) formed of copper foil on the back of the substrate (108) are disposed on the inside bottom surface of a mirror case (103) at a distance (h) spaced from a mirror (104) made of metallic material. The slot elements (109a, 109b) are excited in that a phase difference is produced by microstrip lines (110a, 110b) constituting a T-branch circuit, so as to form a beam tilted from vertical direction to surface direction with respect to the substrate (108) surface under the influence of the mirror (104) operating as a reflecting plate.