Patent ID: 6552685
Filing Date: 2003-04-22
Classification: H01Q

Abstract:
A flat antenna apparatus having a radiation element consisting of a conductor arranged forward of a dielectric plate, an unnecessary radiation of shield conductive plate having a slot corresponding to said radiation element arranged forward of the radiation element, a non-feeding element arranged forward of the unnecessary radiation of shield conductive plate and an back ground plate arranged at the rearward of said dielectric plate, wherein said dielectric plate is constituted of a first dielectric substrate, said radiation element being constituted of a conductive plate provided on the front face of said first dielectric substrate and said back ground plate being constituted of a conductive plate provided on the rear face of said first dielectric substrate, a second dielectric substrate is provided forward of said first dielectric substrate, said unnecessary radiation of shield conductive plate being constituted of a conductive plate provided on the front face of said second dielectric substrate, and a third dielectric substrate is provided forward of said second dielectric substrate, said non-feeding element being constituted of a conductive plate provided on the front face of this third dielectric substrate, and these first, second and third dielectric substrates are overlapped on each other.