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公开(公告)号：US11055598B2
公开(公告)日：2021-07-06
申请号：US16233886
申请日：2018-12-27
Applicant: SAMSUNG ELECTRONICS CO., LTD.
Inventor： Kyeongdo Kim , Sanghyo Lee , Seungwon Lee , Jongpil Cho
Abstract: A smart card includes an antenna to transmit and to receive a radio frequency signal, a rectifier to rectify a signal received through the antenna to output a rectified voltage, a voltage regulator to operate in a first operation mode for stabilizing a level of the rectified voltage and a second operation mode for generating an internal voltage using the rectified voltage, a regulator converter to control the voltage regulator to operate the voltage regulator in one of the first operation and the second operation according to a mode selection signal, a clamp circuit to connect an output terminal of the rectifier to a ground according to the mode selection signal, a load modulator to vary a resistance of the antenna to perform a load modulation, and a regulator controller to generate the mode selection signal according to whether the load modulator is activated or deactivated.
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公开(公告)号：US11928539B2
公开(公告)日：2024-03-12
申请号：US18111014
申请日：2023-02-17
Applicant: SAMSUNG ELECTRONICS CO., LTD.
Inventor： Kyeongdo Kim , Sanghyo Lee , Seungwon Lee , Jongpil Cho
CPC classification number: G06K19/07773 , G06K19/0715 , H02M1/08 , H02M1/0045 , H02M3/156 , H02M7/06
Abstract: A smart card includes an antenna to transmit and to receive a radio frequency signal, a rectifier to rectify a signal received through the antenna to output a rectified voltage, a voltage regulator to operate in a first operation mode for stabilizing a level of the rectified voltage and a second operation mode for generating an internal voltage using the rectified voltage, a regulator converter to control the voltage regulator to operate the voltage regulator in one of the first operation and the second operation according to a mode selection signal, a clamp circuit to connect an output terminal of the rectifier to a ground according to the mode selection signal, a load modulator to vary a resistance of the antenna to perform a load modulation, and a regulator controller to generate the mode selection signal according to whether the load modulator is activated or deactivated.
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公开(公告)号：US12040828B2
公开(公告)日：2024-07-16
申请号：US17708408
申请日：2022-03-30
Applicant: SAMSUNG ELECTRONICS CO., LTD.
Inventor： Minchul Kang , Sanghyo Lee , Kyeongdo Kim , Inhyuk Kim
CPC classification number: H04B1/40 , H02J50/80 , H03H7/06 , H03H7/38 , H04B1/1018
Abstract: A communication device is provided. The communication device includes: an antenna; a matching circuit connected with the antenna; a transmitter configured to generate a transmission communication signal and provide the transmission communication signal to the antenna through the matching circuit; a filter connected between the matching circuit and the antenna; and a receiver configured to receive an attenuated signal from the antenna through the filter. The filter is configured to pass frequencies of an antenna signal corresponding to a pass band and attenuate frequencies of the antenna signal corresponding to a stop band, and a center frequency of the transmission communication signal corresponds to the stop band of the filter.
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公开(公告)号：US11586873B2
公开(公告)日：2023-02-21
申请号：US17366908
申请日：2021-07-02
Applicant: SAMSUNG ELECTRONICS CO., LTD.
Inventor： Kyeongdo Kim , Sanghyo Lee , Seungwon Lee , Jongpil Cho
Abstract: A smart card includes an antenna to transmit and to receive a radio frequency signal, a rectifier to rectify a signal received through the antenna to output a rectified voltage, a voltage regulator to operate in a first operation mode for stabilizing a level of the rectified voltage and a second operation mode for generating an internal voltage using the rectified voltage, a regulator converter to control the voltage regulator to operate the voltage regulator in one of the first operation and the second operation according to a mode selection signal, a clamp circuit to connect an output terminal of the rectifier to a ground according to the mode selection signal, a load modulator to vary a resistance of the antenna to perform a load modulation, and a regulator controller to generate the mode selection signal according to whether the load modulator is activated or deactivated.
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