Microstrip Antenna

A microstrip antenna comprising:

• a ground plane;
• a dielectric material having a predetermined thickness disposed on the ground plane;
• an inner radiating element disposed on the dielectric material and having a predetermined outer perimeter, the inner radiating element having a first resonant frequency and a first polarization;
• a first feed network coupled to the inner radiating element, the first feed network having at least one feed point;
• an outer radiating element disposed on the dielectric material, co-planar with and at least partially surrounding the inner radiating element, the outer radiating element being spaced a predetermined distance from the outer perimeter of the inner radiating element, the outer radiating element having a predetermined inner perimeter and a predetermined outer perimeter, the outer radiating element having a second resonant frequency and a second polarization;
• a second feed network capacitively coupled to the outer radiating element, the second feed network having at least one feed point wherein the at least one feed point is surrounded by a space thereby creating at least one feed point island within the outer radiating element;
• and
• wherein a single feed point of the at least one feed point on the inner radiating element is actively fed by a first supply and wherein a single feed point island of the at least one feed point for the outer radiating element is actively fed by a second supply.