Patent ID: 6798384
Filing Date: 2004-09-28
Classification: H01Q

Abstract:
A multi-element planar array antenna comprising:a substrate having a first and a second principal surface; a conductor formed on said first principal surface; a first and a second slot line formed in said conductor, and intersecting each other; a first and a second microstrip line formed on said second principal surface, and traversing said first slot line respectively at positions corresponding to both end sides of said first slot line; a third and a fourth microstrip line formed on said second principal surface, and traversing said second slot line respectively at positions corresponding to both end sides of said second slot line; a first antenna element electromagnetically coupled to one end of said first microstrip line and to one end of said third microstrip line through said substrate; a second antenna element electromagnetically coupled to one end of said second microstrip line and to the other end of said third microstrip line through said substrate; a third antenna element electromagnetically coupled to the other end of said second microstrip line and to one end of said fourth microstrip line through said substrate; and a fourth antenna element electromagnetically coupled to the other end of said first microstrip line and to the other end of said fourth microstrip line through said substrate, wherein each of said antenna elements is a slot line antenna element formed on said first principal surface and capable of being excited in two directions.