| 摘要 |
An antenna assembly ( 30 ) for a communication device ( 20 ) includes a feed structure ( 25 ), which has front and rear sides ( 26, 27 ), and which is coupled to be driven by the device so as to radiate an electromagnetic field in a given frequency band. An electrically reactive surface ( 28 ) is positioned adjacent to the rear side of the feed structure so as to define a cavity ( 35 ) between the feed structure and the reactive surface, thereby substantially nulling the electromagnetic field on the rear side of the feed structure.
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