Loop antenna for mobile handset and other applications

An antenna system comprising:

• a parasitic loop antenna formed as a conductive track on a dielectric substrate having first and second opposed surfaces, the dielectric substrate having a first ground point and a second ground point adjacent to each other on the first surface of the dielectric substrate, the conductive track being formed on the dielectric substrate and having a first arm and a second arm,
• the first arm being formed on the dielectric substrate and following a first path starting at the first ground point, extending toward a first edge of the dielectric substrate, extending to the second surface of the dielectric substrate, extending across the second surface of the dielectric substrate along a second path, and connecting to a conductive arrangement, and
• a second arm formed on the dielectric substrate and following a third path starting at the second ground point, extending toward a second edge of the dielectric substrate, extending to the second surface of the dielectric substrate, extending across the second surface of the dielectric substrate along a fourth path, and connecting to the conductive arrangement, the conductive arrangement comprising both inductive and capacitive elements and being formed on the second surface of the dielectric substrate and extending into a central part of a loop formed by the conductive track on the second surface of the dielectric substrate;
• and
• a separate, directly driven antenna configured to excite the parasitic loop antenna.

An antenna system comprising:

• a parasitic loop antenna formed as a conductive track on a dielectric substrate having first and second opposed surfaces, the dielectric substrate having a first ground point and a second ground point adjacent to each other on the first surface of the dielectric substrate, the conductive track being formed on the dielectric substrate and having a first arm and a second arm,
• the first arm being formed on the dielectric substrate and following a first path starting at the first ground point, extending toward a first edge of the dielectric substrate, extending to the second surface of the dielectric substrate, extending across the second surface of the dielectric substrate along a second path, and
• a second arm formed on the dielectric substrate and following a third path starting at the second ground point, extending toward a second edge of the dielectric substrate, extending to the second surface of the dielectric substrate, extending across the second surface of the dielectric substrate along a fourth path, and electrically connecting to first arm;
• and
• a separate, directly driven antenna configured to excite the parasitic loop antenna.