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Advanced Chipless RFID by Chamath Divarathne, Mohammad Zomorrodi, Nemai Chandra Karmakar

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CHAPTER 4ATTRIBUTES OF EM POLARIZERS

4.1 INTRODUCTION

Electromagnetic (EM) polarizers were introduced in Chapter 3. The edge diffraction of the proposed polarizer and its antenna mode result in significant cross-polar components in the backscattered direction, which provides the basis for the data encoding in a chipless RFID system. In this chapter, the fabricated polarizers through the photolithographic process and printing technique are tested in laboratory environment. When the depolarization aspect of the suggested structure as polarizer is confirmed, then the cross-polarized working basis is reviewed in more detail. First, the equivalent system model is introduced to ease the network analysis of the proposed cross-polarized system. The effectiveness of the system for unwanted reflections is proved mathematically. Then, different measurement scenarios are considered to investigate the system robustness in various scenarios. The effect of reflections from other objects and multipath interferences are also considered in the measurement process. This finding suggests huge advantages of the EM-polarizer-based system for industrial environments. Moreover, the polarizer-based tag is shown to be very efficient for tagging of highly reflective items; water bottles or metallic cans, for example. The bending effect of the tag conformal to various types of objects, on its cross-polar performance, is also considered in this chapter. Finally, the effect of barriers on the system performance ...

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