This book addresses the theory, analysis and design of CMOS RFID components and systems suitable for frequencies from UHF to millimeter waves for different applications ranging from the consumer to medicine and automobile realms. The first single source to explain the design of the components and systems in detail at the practicing engineering level, the book covers the essential elements and the analysis, simulations, layouts, fabrication and tests of CMOS RFICs. It also presents various design examples of CMOS readers, tags, synthesizers, antennas, and complete CMOS RFID systems.