Wireless charging device, wireless charging system, and wireless charging method

A wireless charging device, comprising:

• 1) a metal frequency-selective box;
• and
• 2) an internal charging system disposed inside the metal frequency-selective box for wireless charging equipment;
• wherein:
• the internal charging system comprises a multi-antenna subsystem comprising N antenna units;
• N is an integer greater than 2, and the antenna units are dipole antennas, microstrip patch antennas, microstrip slot antennas, helical antennas, or dielectric resonator antennas;
• the N antenna units are evenly disposed, in a two-dimensional ring, on inner sides of four side faces of the metal frequency-selective box, or disposed on a three-dimensional curved surface of an inner side of the metal frequency-selective box;
• when in use, a device to be energized is disposed in the metal frequency-selective box and is surrounded by the N antenna units;
• the N antenna units are polarized by linear polarization or circular polarization;
• the linear polarization comprises horizontal linear polarization, vertical linear polarization, and ±45° slant polarization;
• and the circular polarization comprises left-hand circular polarization and right-hand circular polarization;
• the multi-antenna subsystem further comprises a plurality of receiving-transmitting components;
• one receiving-transmitting component corresponds to one antenna unit to form an active antenna;
• each receiving-transmitting component comprises a receiving antenna unit and a transmitting antenna unit;
• a height direction of the metal frequency selective box is z-axis;
• receiving antenna units and transmitting antenna units are disposed on one plane, placed along the z-axis, with a distance of 120 mm between adjacent transmitting antenna units, and 16 antenna units form a square with sides of length 500 mm;
• and
• frequencies for the communication and data exchange of mobile devices to be energized with outside comprise 3G, 4G, 5G, WiFi, Bluetooth and GPS, the electromagnetic waves of which penetrate a band-pass frequency-selective network without hindrance, while the electromagnetic waves corresponding to a charging frequency fail to penetrate the band-pass frequency-selective network.