Communication control method for communication device, item management equipment, and item management system

A communication control method for a communication device that includes a plurality of antennas and a capacitor, the plurality of antennas including a communication antenna for communicating with a wireless device and an energy acquisition antenna for acquiring energy from surrounding radio waves, the capacitor being charged based on energy acquired by the energy acquisition antenna, wherein the communication device communicates with the wireless device when a voltage of the capacitor is equal to or higher than a predetermined value,

• the method comprising:
• blocking communication of the communication device with the wireless device by causing a radio wave shield member to be close to the communication antenna among the plurality of antennas, or by covering at least a part of the communication antenna with the radio wave shield member;
• charging the capacitor by the communication device, based on energy acquired by the energy acquisition antenna, regardless of whether the communication device can communicate with the wireless device, and thereby keeping a voltage of the capacitor equal to or higher than the predetermined value;
• and
• resuming communication of the communication device with the wireless device when the radio wave shield member is stopped from being close to the communication antenna or when at least a part of the communication antenna is stopped from being covered with the radio wave shield member.

An item management device comprising:

• an item attachment device including a linear member and a biasing member, the linear member having one end that is attached to an item, the biasing member biasing the linear member from the one end in a first direction;
• a communication device attached to the linear member;
• and
• a device accommodation part that can accommodate the communication device and includes a metal-containing member fixed inside, wherein
• the communication device comprises a plurality of antennas and a capacitor, the plurality of antennas including a communication antenna for communicating with a wireless device and an energy acquisition antenna for acquiring energy from surrounding radio waves, the capacitor being charged based on energy acquired by the energy acquisition antenna, wherein the communication device communicates with the wireless device when a voltage of the capacitor is equal to or higher than a predetermined value,
• when external force is not applied to the item against biasing force in the first direction generated by the biasing member, the communication device is accommodated in the device accommodation part, and when external force is applied to the item against the biasing force in the first direction generated by the biasing member, the communication device is enabled to exit from the device accommodation part, and
• the item management device is configured in such a way that when the communication device is accommodated in the device accommodating part, the communication antenna among the plurality of antennas is close to the metal-containing member, or at least a part of the communication antenna is covered with the metal-containing member.