Planar antenna for mobile satellite applications

A multi-system antenna for mobile communications comprising:

• a first electrically conducting ground plane having two first slots and one second slot;
• an annular patch radiating element having a central axis;
• a circular patch radiating element concentrically arranged and coplanar with respect to the annular patch radiating element;
• at least one first dielectric layer disposed between the first electrically conducting ground plane and the annular and circular patch radiating elements;
• two first feed lines and one second feed line slot-coupled to the annular and circular patch radiating elements for communicating signal energy in a contactless manner with the annular and circular patch radiating elements respectively through the first and second slots;
• and
• a second dielectric layer disposed between the first and second feed lines and the first electrically conducting ground plane, wherein the two first slots are orthogonal with respect to one another on the first electrically conducting ground plane axis and configured to receive both left and right hand circular polarizations of a first application with the annular patch radiating element.