An antenna includes a substantially planer substrate and a helical winding. The substantially planer substrate includes a first surface and a second surface. The helical winding includes a first pattern, a second pattern, and a plurality of interconnections. The first pattern is affixed to the first surface and the second pattern is affixed to the second surface. Connection nodes of the first pattern are coupled to associated connection nodes of the second pattern by the plurality of interconnections.

 
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> Symbol detector based on frequency offset compensation in ZigBee system and symbol detecting method thereof

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