Patent ID: 6114998
Filing Date: 2000-09-05
Classification: H01Q

Abstract:
A multilayer antenna unit having electrically steerable transmit and receive beams comprising:a first array antenna;a second array antenna;a first layer having a plurality of antenna elements arranged in a first lattice wherein said first lattice forms a portion of said first array antenna, said first layer for transmitting radio signals;a second layer having a plurality of antenna elements arranged in a second lattice wherein said second lattice forms a portion of said second array antenna for receiving radio signals;a third layer of an electrically conductive material forming a ground plane;a first dielectric layer arranged between said first and second layer;a second dielectric layer arranged between said second and third layer; andwherein said first and second array antenna are embedded in said antenna unit in a periodical multi-layer structure where said first lattice is interleaved with said second lattice, and further wherein said transmit and receive beams of said antenna unit have the capability of pointing in substantially equal directions in substantially equal scan volumes.