Patent ID: 6211832
Filing Date: 2001-04-03
Classification: H01Q

Abstract:
A windowpane antenna apparatus for vehicles, comprising:a defogger, mounted on a window of a vehicle, for defogging the window;means for causing the defogger to serve as a slot antenna; anda driven antenna disposed adjacent to the defogger with a gap therebetween whereby the driven antenna and the defogger are mutually coupled,wherein said means for causing the defogger to serve as a slot antenna includes:first means for separating the defogger from a power supply voltage application line in a high-frequency manner by interposing an inductance element between each of both ends of the defogger and the power supply voltage application line; andsecond means for causing the defogger to serve equivalently as a single metal thin plate for a received wave, said second means being obtained by forming the defogger so as to have a mesh pattern including a plurality of meshes, each of said meshes having a long side that is shorter than the wavelength of the received wave.