Radio frequency identification (rfid) moisture tag(s) and sensors with extended sensing via capillaries

A radio frequency identification (RFID) tag comprises:

• a power harvesting circuit operable to generate power for the RFID tag from a continuous wave of an inbound radio frequency (RF) signal;
• an RF front-end operable to receive the inbound RF signal and to transmit an outbound RF signal, wherein the RF front-end includes a tuning circuit that is tuned based on a capacitance setting, wherein tuning of the tuning circuit effects a characteristic of the RF front-end, and wherein the capacitance setting is indicative of a power level of the power, is indicative of an environmental condition to which the RFID tag is exposed, or is indicative of both the power level and the environmental condition;
• and
• a processing module operably coupled to:
• generate the capacitance setting to adjust the characteristic of the RF front-end to a desired characteristic.