Planar dual-frequency antenna and radio apparatus employing a planar antenna
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United States of America Patent
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Jun 26, 2001
Issued Date -
N/A
app pub date -
Jan 5, 2000
filing date -
Jan 5, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A PIFA structure has a first operating frequency and a second operating frequency. It comprises a planar radiating element (801, 1002, 1101, 1203) which is a conductive area confined by a substantially continuous border line divided by a non-conductive slot (802). The slot has a first end on said substantially continuous border line and a second end within the conductive area. The planar radiating element comprises a feedpoint (803, 1206) and ground contact (804, 1208) near the first end of the slot so that the electrical length of the conductive area divided by the slot, measured at the feedpoint, equals a quarter of the wavelength at the first operating frequency and the electrical length of the slot equals a quarter of the wavelength at the second operating frequency.
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