System to increase communication range of radio frequency identification (rfid) tag

A system to increase communication range of Radio Frequency Identification (RFID) tags comprising:

• An antenna configured to receive a Radio Frequency (RF) signal, which are wirelessly transmitted from an RFID reader and provide the received RF signal to the two Radio Frequency (RF) terminals;
• A Radio Frequency Identification Integrated Circuit (RFID IC) connected to the antenna, the RFID IC configured to:
• receives an Radio Frequency (RF) signal from the antenna;
• tunes the received RF signal by a resonant capacitor and the antenna to have a certain resonant frequency;
• converts the RF signal of the resonant capacitor which is an alternating current (AC) signal to be a direct current (DC) signal by a rectifier;
• senses or measures the DC signal by a sensing circuit;
• compares the DC signal with a reference current or voltage signal of the RFID tags by a comparator;
• determines a modulation pattern in a RF control unit based on the magnitude level of the comparator output signal;
• sends the modified modulation signal to an uplink modulator to modulate the RF signal to be a modified RF signal;
• transmits the modified RF signal, by the uplink modulator, to the antenna to RFID readers.