Suprema Inc.

Chu Yeonsoo

Yoon Siwoong

Jeon Yongwook

An access control device according to an embodiment includes: a communication module configured to perform communication by using a UWB communication protocol and one or more processors, and the communication module includes: a substrate, an antenna disposed on a first surface of the substrate, and a ground disposed on a second surface which is opposite to the first surface of the substrate, and the one or more processors are configured to: receive a signal from a user terminal through the communication module; and determine whether the user terminal is positioned in a first direction or second direction, based on a change in a phase angle of the signal received from the user terminal when a direction from the substrate to the antenna is the first direction and a direction from the substrate to the ground is the second direction.

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Gunpo-si, South Korea

Chu Yeonsoo