Antenna substrate and image forming apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorWataru Shirai
Life of this patent
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Abstract
An antenna substrate includes a substrate, a modulation/demodulation circuit, a printed antenna, a first switch circuit, and a second switch circuit. The printed antenna printed on the substrate includes a plurality of unit coils. The first switch circuit selectively switches to a state where a part or all of the plurality of unit coils are selectively and electrically connected in series, or a state where a part or all of the plurality of unit coils are electrically disconnected, in accordance with a first control signal inputted to the first switch circuit. The second switch circuit selectively and electrically connects a first end of any one of the plurality of unit coils to the modulation/demodulation circuit in accordance with a second control signal inputted to the second switch circuit.
Claims9
An antenna substrate comprising:
- a substrate;
- a modulation/demodulation circuit mounted on the substrate and configured to output and receive a communication signal to be used for short-range wireless communication with an electronic tag;
- a printed antenna printed on the substrate and configured to transmit and receive the communication signal as a radio wave;
- a first switch circuit mounted on the substrate;
- and
- a second switch circuit mounted on the substrate, wherein
- the printed antenna includes a plurality of unit coils that are each a metal foil printed in a coil shape on the substrate,
- the first switch circuit selectively switches to a state where a part or all of the plurality of unit coils are selectively and electrically connected in series, or a state where a part or all of the plurality of unit coils are electrically disconnected, in accordance with a first control signal inputted to the first switch circuit, and
- the second switch circuit selectively and electrically connects a first end of any one of the plurality of unit coils to the modulation/demodulation circuit in accordance with a second control signal inputted to the second switch circuit.
Dependencies are inferred from the claim text.