A Fully Integrated 2.45G Semi-Active RFID Tag IC

Abstract

In recent years, radio frequency identification (RFID) microwave technology receives great attention because of its advantages, e.g. long identification distance, small size of antenna, high identification speed and strong anti-collision ability. RFID tag plays one of the most important roles in logistics, and therefore special attention should be paid to tag design. In this paper, we present a 2.45G semi-active tag design, which is compatible with ISO 18000-4. The proposed tag can switch the manners of working between active and passive. When the generated RF-power is sufficient to operate, the tag works as a passive tag, and low noise amplifier (LNA), oscillator (OSC) and power amplifier (PA) are cut off to save the whole chip power consumption mostly. Otherwise it operates in active mode using battery power, and the working distance is greatly increased as a result of using PA.

Optimum number and optimal location of readers for RFID power tags in buildings inhabitant control applications

“…[7] developed a battery-less active RFID in which energy is harvested through accelerator sensing devices on the RFID. Active RFID devices can continue their work as passive RFID when their battery is depleted known as semi active RFID devices [8].…”