Dual antenna capable of transmitting and receiving circularly polarized electromagnetic wave and linearly polarized electromagnetic wave
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United States of America Patent
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Apr 12, 2005
Grant Date -
Oct 23, 2003
app pub date -
Apr 17, 2003
filing date -
Apr 17, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A direction of a power feed patch relative to a rod-shaped antenna is set so that a short axis thereof substantially orthogonally crosses a plane containing an intersection between the short axis and a long axis of the power feed patch of a patch antenna and an axis of the rod-shaped antenna. As a plane of polarization of a linearly polarized electromagnetic wave radiated from the rod-shaped antenna is thereby caused to substantially coincide with a direction of the long axis of the power feed patch and to substantially orthogonally cross a direction of the short axis, even if a powerful wave of a higher frequency than a desired frequency to be received by the patch antenna and difficult to be removed by a band pass filter of a low-noise amplifier circuit is radiated from the rod-shaped antenna, field components of the high frequency electromagnetic wave in the direction of the short axis will become virtually zero.
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