| 摘要 |
An antenna system comprises first and second antennas that are arranged on a printed circuit board (PCB) and that include an arc-shaped element having a concave side and a convex side. A conducting element extends substantially radially from a center of the concave side. A U-shaped element has a base portion with a center that communicates with the conducting element and two side portions that extend from ends of the base portion towards the concave side. Third and fourth antennas are arranged on the PCB and include an inner ring and an outer ring that is concentric to the inner ring.
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