Loop antenna for mobile handset and other applications

摘要

There is disclosed an antenna system for mobile handsets and other devices. The antenna system comprises a dielectric substrate having first and second opposed surfaces, a conductive track on the substrate, and a separate, directly driven antenna to drive the parasitic loop antenna formed by the conductive track. Two grounding points are provided adjacent to each other on the first surface of the substrate, with the arms of the conductive track extending in generally opposite directions from the grounding points. The conductive tracks then extend towards an edge of the dielectric substrate, before passing to the second surface of the dielectric substrate and then passing across the second surface of the dielectric substrate following a path generally following the path taken on the first surface of the dielectric substrate. The conductive tracks then connect to respective sides of a conductive arrangement formed on the second surface of the dielectric substrate that extends into a central part of a loop formed by the conductive track on the second surface of the dielectric substrate.

主权项

1. 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 loading plate, 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 loading plate, the conductive loading plate 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.