Asymmetric dipole antenna assembly
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United States of America Patent
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-
May 29, 2001
Issued Date -
N/A
app pub date -
Aug 24, 1999
filing date -
Feb 27, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An asymmetric dipole antenna assembly is provided for wireless communications devices, and includes separate upper and lower conductor traces and a low impedance feedpoint at the junction of the conductor traces. The upper conductor trace may include a matching network and may be printed on a planar printed circuit board mounted proximate the top of the a hand-held wireless transceiver. The upper conducting trace provides 1/4 wave resonance over a desired frequency range and a 50 ohm input impedance for the antenna. The lower conductor trace may be provided by the ground trace of the wireless device circuitry, requiring only a minimum effective trace length of 1/4 wavelength at the lowest frequency of operation. Polarization of the antenna is determined by the orientation of the longest dimension of the lower conductor.
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