Autonomous battery-free microwave frequency communication system

A method of performing autonomous communications by a battery-free device comprising:

• receiving charging packets that comprise wireless local area network (WLAN) clear to send (CTS) packets via at least one antenna;
• harvesting microwave energy from the received wireless local area network (WLAN) clear to send (CTS) packets and storing the harvested microwave energy on a capacitor, wherein the wireless local area network (WLAN) clear to send (CTS) packets are selectively generated for charging the capacitor;
• transmitting a response packet using the at least one antenna in response to determining that the capacitor is sufficiently charged;
• generating at least one data frame formatted according to a first communications protocol using energy stored on the capacitor;
• generating a microwave frequency carrier using energy stored on the capacitor;
• modulating the microwave frequency carrier with the data frame using energy stored on the capacitor to provide a modulated information;
• and
• transmitting the modulated information via the at least one antenna using energy stored on the capacitor.

A wireless radio frequency tag device, comprising:

• a physical article configured for a predetermined purpose;
• and
• an autonomous battery-free microwave frequency communication device embedded on said physical article to enhance said predetermined purpose comprising:
• a capacitor;
• at least one antenna;
• a microwave energy harvesting system which is configured to harvest and store microwave energy from wireless local area network (WLAN) request to send (RTS) packets that are selectively generated to charge the capacitor received via said at least one antenna onto said capacitor;
• a microwave frequency transceiver powered by energy stored on said capacitor, which is configured to use a portion of energy stored on said capacitor to autonomously generate a microwave frequency carrier and to autonomously transmit information using said microwave frequency carrier according to a predetermined communications protocol via said at least one antenna;
• and
• a control system powered by energy stored on said capacitor, which is configured to provide said information for transmission, wherein said information is associated with said predetermined purpose, and wherein said control system comprises a memory for storing data associated with said predetermined purpose, wherein said physical article comprises an advertisement flyer and wherein said information and data is associated with at least one commercial enterprise.