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AssigneeAlps Electric Co., Ltd.
InventorDou Yuanzhu
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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.
A dual antenna provided with a patch antenna having a power feed patch disposed over a dielectric substrate and capable of transmitting and receiving a circularly polarized electromagnetic wave and a rod-shaped antenna erected in the vicinity of the patch antenna and capable of transmitting and receiving a linearly polarized electromagnetic wave, wherein the power feed patch is formed by causing a short axis whose resonance length is set smaller and a long axis whose resonance length is set greater to orthogonally cross each other, and wherein a direction of the power feed patch relative to the rod-shaped antenna is set so that the short axis substantially orthogonally crosses a plane containing an intersection between the short axis and long axis and an axis of the rod-shaped antenna.
Dependencies are inferred from the claim text.