Patent ID: 11929792
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. The energy harvester of claim 18 wherein the energy harvester comprises:
one or more transmitters;
one or more receivers;
passive energy harvesting circuitry;
one or more antennas coupled to the one or more transmitters, the one or more receivers, and the passive energy harvesting circuitry;
processing circuitry connected to the one or more transmitters and the one or more receivers; and
an energy storage device;
wherein:
the passive energy harvesting circuitry attempts to collect energy from a radio frequency signal on both a first frequency and a second frequency and store the collected energy in the energy storage device; and
the processing circuitry is configured to cause the energy harvester to:
determine that a threshold amount of energy has been collected and stored in the energy storage device and that a signature of the radio frequency signal matches a signature of the energy harvester;
determine whether the signature of the radio frequency signal that matches the signature of the energy harvester was detected on the first frequency or the second frequency;
upon determining that the signature of the radio frequency signal that matches the signature of the energy harvester was detected on the first frequency, transmit a radio frequency signal modulated with the signature of the energy harvester on the second frequency; and
upon determining that the signature of the radio frequency signal that matches the signature of the energy harvester was detected on the second frequency, transmit the radio frequency signal modulated with the signature of the energy harvester on the first frequency.