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HF RFID Transponder Antenna Design
Keywords: RFID , Tag, Semiconductor
With the introduction of the Tag-it™ HF-I Transponder Plus, Pro and Standard ICs as part of TI’s 13.56 MHz product family, which is based on the ISO/IEC 15693 standard for contactless integrated circuit cards (vicinity cards) and the ISO/IEC 18000-3 standard for item management. These transponder ICs provide the basis for the design of a multitude of inlay shapes and sizes, which can then be as consumable or reusable smart labels or tags in markets requiring quick and accurate identification of items, such as: •asset tagging •electronic ticketing •anti-counterfeit prevention •distribution logistics and supply chain management •building access badges •express parcel delivery •airline boarding pass and baggage handling User data is written to and read from memory blocks using a non-volatile EEPROM silicon technology. Each block is separately programmable by the user and can be locked to protect data from modification. Once the data has been ‘locked’, then it cannot be changed. (with the exception of the Pro IC) To give some examples, information about delivery checkpoints and timing, place of origin/destination, pallet assignments, inventory numbers and even transportation routes can be coded into the transponder. Multiple transponders, which appear in the Readers RF field, can be identified, read from and written to by using the Unique Identifier (UID), which is programmed and locked at the factory. To build a complete transponder, the Tag-it HF-I Transponder ICs have to be made part of a resonant circuit with an external antenna and possibly a tuning capacitor. This application note explains how to design suitable antenna coils for the three Texas Instruments ISO15693 Transponder ICs currently available.
Joshua D. Wyatt, RFID Systems/Applications Engineer
Texas Instruments Inc.
Plano , TX

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