Patent ID: 7667650
Filing Date: 2010-02-23
Classification: H01Q

Abstract:
1. A microstrip patch antenna for mobile satellite communications comprising: a first electrically conducting ground plane having two slots; at least one annular patch radiating element having a central axis; at least one first dielectric layer disposed between the first electrically conducting ground plane and the patch radiating element; two feed lines slot-coupled to the patch radiating element for providing signal energy in a contactless manner to or from the patch radiating element through the slots; and a second dielectric layer disposed between the feed line and the first electrically conducting ground plane, wherein the antenna further comprises a second ground plane and a third dielectric layer disposed between the second ground plane and the feed line, and wherein the two slots are radially oriented with respect to the central axis and angularly shifted so as to receive both left and right hand circular polarisations.