K E Y W O R D S antenna, high frequency, RFID, tuning 1 INTRODUCTION According to many manufacturing, energy, and service industry experts, radio frequency identification (RFID) has become arguably the most ubiquitous element for automatic identification and second only to the use of barcoded labels, in the view of others. The prototyped antenna was tuned, connected to the RWD via a 50 Ω coaxial cable and tested. Common practical problems that are often encountered in such design processes are also commented on. To validate the approaches outlined, a stepwise design and measurement of an HF antenna for an ISO/IEC 15693 compliant read/write device (RWD) is described. Tuning circuits necessary to adjust the resonance and power matching characteristics of antennas for good transponder interrogation and response recovery are discussed. It presents brief theory relevant to RFID communication and sets up a framework within which features and requirements of antennas are linked to key design parameters such as antenna form-factor and size RF power level, material and communication protocol. This article describes an in-depth methodical approach to the development of efficient high-frequency (HF) antennas for use in radio frequency identification (RFID) systems operating at 13.56 MHz.
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