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US 9,431,698 B2Granted
Wireless communication device
AssigneeMurata Manufacturing Co., Ltd.
InventorKuniaki Yosui
Life of this patent
Estimating the term…
Abstract
A wireless communication device includes a resistive-element-including RFIC and an antenna coil. The resistive-element-including RFIC includes an RFIC, a capacitive element, and resistive elements. The resistive elements and a portion of a circuit in the RFIC define a variable impedance circuit. The RFIC controls the impedance of a resistive circuit added to an antenna circuit in accordance with certain IO terminals set as output ports or input ports, thus obtaining a Q value of the antenna circuit in accordance with a communication speed.
Claims17
A wireless communication device comprising:
- a contactless communication IC including a communication terminal configured to transmit/receive a signal and an IO terminal;
- an antenna connected to the communication terminal of the contactless communication IC;
- and
- a resistive element connected between the IO terminal and the antenna;
- wherein
- the IO terminal is settable to define one of an input port and an output port based on an input/output control signal, and the IO terminal has a different impedance when defining an input port and when defining an output port.
3 more elements
Dependencies are inferred from the claim text.