Dual antenna and radio device
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United States of America Patent
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Apr 19, 2005
Grant Date -
May 29, 2003
app pub date -
Nov 27, 2002
filing date -
Nov 27, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
An arrangement for enhancing electrical isolation between antennas in antenna structures comprising at least two antennas, and a radio device applying the arrangement. The interfering antenna comprises components causing substantial degradation in radiation characteristics in the operating band of another antenna. For example, a PIFA (310) may comprise, instead of a short-circuit conductor, a conductive structure (312, 313, 314) having a parallel resonance in the operating band of another antenna (320). Mutual interference of radio parts using separate antennas can be made relatively small without electrical isolation arrangements between antenna elements. Moreover, the invention makes antenna filter design easier and reduces disadvantages caused by antenna filters.
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