By Reza Rezaiesarlak, Majid Manteghi
This publication examines the layout of chipless RFID platforms. The authors start with the philosophy of RFID and its influence on advertisement purposes. Then, they speak about the chipless RFID structures and the applying of chipless RFID platforms, the benefits it offers in comparison to traditional barcode identification and chipped RFID tags. The textual content then covers chipless RFID parts in block diagram illustration and introduce FCC standards which may be thought of within the layout process of every part. The 3rd bankruptcy is devoted to the advanced common resonance-based layout of chipless RFID tags. the following bankruptcy matters concerning the detection options brought for the id of chipless RFID tags. The 5th bankruptcy is devoted to the localization and anti-collision suggestions in chipless RFID platforms. ultimate bankruptcy is chipless RFID tags as sensors. It offers a few functions the place the tag can be utilized as either identification and sensor. The tag requisites and detection concerns are addressed during this section.
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Extra resources for Chipless RFID: Design Procedure and Detection Techniques
Here, the former case is considered for simplicity in formulations. Therefore, the scattered electric field is written in the Laplace domain as  ZZ ! 0 0 1 0 I À 2 ∇∇ G0 r; r ; s Á J r ; s dS k $ s E ðr; sÞ ¼ Àμs A ð2:11Þ $ where I ¼ x^ x^ þ y^ y^ þ z^z^, s ¼ α + jω is the complex frequency, k ¼ s/c represents the propagation constant of the fields in the complex frequency domain, and A is the surface of the tag. The primed and unprimed coordinates represent the source and observation points, respectively.
In the near field, the scattered field is mostly similar to the incident pulse, but in the far field, the scattered field is limited to the first time-derivative of the incident field . As an example, the scattered field from a rectangular metal plane with size of 15 cm Â 15 cm illuminated by an incident pulse is considered. The measurement set-up is shown in Fig. 8. A rectangular metal plane is located 60 cm above an optical table. A TEM horn antenna is connected to a digital sampling oscilloscope in order to calculate the backscattered signal from the tag at different distances.
Different issues concerning with current designs are discussed based on both SEM and CM analysis, and a systematic design technique for improving the tag response is presented in this chapter. In Chap. 4, the time and frequency characteristics of the scattered signal from chipless RFID tags are studied. Then, it will be shown that a time-frequency analysis is required in order to extract the required information of the tag in the reader. Various time-frequency techniques such as short-time Fourier transform (STFT), wavelet are studied in more detail.