Antenna apparatus for communicating with noncontact communication medium via electromagnetic waves
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United States of America Patent
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Nov 3, 2020
Grant Date -
Sep 14, 2017
app pub date -
Mar 13, 2017
filing date -
Mar 14, 2016
priority date (Note) -
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Abstract
An antenna apparatus includes: a switch having a single one-side terminal and four other-side terminals; and a distributor that distributes electric power supplied via the switch to a terminal and a terminal with a phase difference of 90 degrees. The apparatus further includes a switch that switches to either of a state in which conduction is achieved between an other-side terminal of the switch and a horizontally polarized wave antenna, and a state in which conduction is achieved between the terminal of the distributor and the horizontally polarized wave antenna. The apparatus further includes a switch that switches to either of a state in which conduction is achieved between an other-side terminal of the switch and a vertically polarized wave antenna, and a state in which conduction is achieved between the terminal of the distributor and the vertically polarized wave antenna. The switches are controlled by a control unit.
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