Abstract
Conventional techniques in chipless radio frequency identification (RFID) systems are incapable of fully overcoming the key challenges of modern identification applications, including high data capacity, low tag cost, and reliable operation. The idea of electromagnetic imaging in chipless RFID systems is a promising technique that shows many advantages over other conventional approaches. This paper reviews conventional chipless RFID technology and provides a comprehensive analysis of advanced millimeter wave spatial-based (also known as image-based) chipless RFID systems with an optimized multiple-input multiple-output-synthetic aperture radar technique for high-resolution image acquisition and a quick reading process.
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