| 摘要 |
A loop antenna 1 for mobile handset applications comprises a conductive track 2 formed on the surfaces of a dielectric substrate, where a first terminal 3 and a second adjacent terminal 4 are on a first surface of the substrate. The conductive tracks 2 extend in generally opposite directions 5, 6 from the respective terminals 3, 4. The tracks 2 then extend in a direction 8 towards an edge of the substrate before passing to a second surface of the substrate where the tracks follow a similar pattern to those on the first surface before connecting at a conductive arrangement 13 formed on the second surface of the substrate. The conductive arrangement 13 extends into a central part of the loop formed by the conductive track 2 on the second surface of the substrate. The conductive arrangement 13 may comprise capacitive and inductive elements in the form of discrete or distributed components which provide a series complex structure. The antenna 1 may have the first and second terminals 3, 4 connected to a feed and ground, respectively. Alternatively, the terminals 3, 4 may both be connected to ground with a further driven antenna arranged to drive the loop antenna via inductive and/or capacitive coupling. The antenna 1 may include parasitic and/or branching elements and can be a multi-mode formation which can operate in several frequency bands. |
