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.
