Abstract: A technique that improves performance of passive backscatter RFID tags such as mitigation of read error in presence of clutter, provide enhanced range, speed up anti-collision reading, provide increased throughput etc. The technique utilizes amplitude and phase modulation at the tag and a compensation algorithm at the RFID reader without inflicting significant changes in the RFID chip and therefore has minimum cost impact. Modifications can be primarily in the antenna design and passive circuitry around it, printable by a single step process.