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公开(公告)号：US20210307175A1
公开(公告)日：2021-09-30
申请号：US17346749
申请日：2021-06-14
Applicant: Whoborn, Inc.
Inventor： Youngsik BAE , WonSuk DO
Abstract: A communication system includes a substrate, a plurality of antennas disposed on the substrate, and a radio frequency (RF) tag. A distance between the RF tag and at least one antenna among the plurality of antennas is detected based on a signal emitted by the RF tag and received by the at least one antenna.
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