Radio frequency switch and method for controlling the same, and radio frequency identification smart shelf system

A method of controlling communication between an RFID reader and a plurality of reader antennas in an RF switch that is connected between one antenna port of the RFID reader and the plurality of reader antennas, the method comprising:

• transmitting an RF signal by opening at least one first output connection port of a plurality of output connection ports that provide a connection to the plurality of reader antennas;
• closing the at least one first output connection port;
• transmitting an RF signal by opening at least one second output connection port of the plurality of output connection ports;
• and
• closing the at least one second output connection port.

An RFID smart shelf system that manages a product through communication with an RFID tag that is attached to the product within a shelf, the RFID smart shelf system comprising:

• a plurality of reader antennas that are mounted on the shelf;
• an RFID reader comprising at least one antenna port and that receives information of the product through communication with the RFID tag;
• and
• a plurality of RF switches that transmit and receive an RF signal between one antenna port of the RFID reader and the plurality of reader antennas and that are sequentially connected between one antenna port of the RFID reader and the plurality of reader antennas.