Dual disk active antenna

An antenna, comprising:

• a first antenna element formed of conducting material on a dielectric substrate, wherein said first antenna element is a circular disk having a diameter;
• a second antenna element formed of said conducting material on said dielectric substrate, wherein said second antenna element is a circular disk having the same said diameter as said first antenna element, and said second antenna element has said conducting material removed from a first isolation region located at the outer periphery of said second antenna element;
• a first contact element formed of said conducting material on said dielectric substrate, wherein said first contact element makes electrical contact with said first antenna element, extends into said first isolation region, and is electrically insulated from said second antenna element;
• a second isolation region providing electrical insulation between a background element and said first antenna element and said background element and said second antenna element, wherein said conducting material is removed from said second isolation region;
• and
• a coaxial cable having a center conductor and an outer conductor wherein said center conductor is electrically connected to said first contact element and said outer conductor is electrically connected to said second antenna element.

An antenna, comprising:

• a first antenna element formed of conducting material on a dielectric substrate, wherein said first antenna element is a circular disk having a diameter;
• a second antenna element formed of said conducting material on said dielectric substrate, wherein said second antenna element is a circular disk having the same diameter as said first antenna element, said second antenna element has said conducting material removed from a first isolation region located at the outer periphery of said second antenna element, and said second antenna element has said conducting material removed from a second isolation region located within said outer periphery of said second antenna element;
• a first contact element formed of said conducting material on said dielectric substrate, wherein said first contact element makes electrical contact with said first antenna element, extends into said first isolation region, and is electrically insulated from said second antenna element;
• a second contact element formed of said conducting material on said dielectric substrate located within said second isolation region, wherein said second contact element is electrically insulated from said second antenna element, said first antenna element, and said first contact element;
• a third isolation region which provides electrical insulation between a background element and said first antenna element and said background element and said second antenna element, wherein said conducting material is removed from said third isolation region;
• a coaxial cable having a center conductor and an outer conductor wherein said outer conductor is electrically connected to said second antenna element;
• a radio frequency amplifier chip having an input pad, an output pad, and a ground pad, wherein said ground pad is electrically connected to said second antenna element;
• and
• a connecting means to connect said center conductor of said coaxial cable to said first contact element when said antenna is operating as a transmitting antenna, and to connect said center conductor of said coaxial cable to said output pad of said radio frequency amplifier chip and said first contact element to said input pad of said radio frequency amplifier chip when said antenna is operating as a receiving antenna.