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RFID technologies are now commonplace with applications such as: cashless payments, access control, library book tagging and electronic passports to name but a few applications. This paper addresses one of the issues that is frequently encountered in near field RFID implementations which is the effects of placing resonant antenna heads in close proximity. This situation arises during the design of...
This paper proposes a procedure for measuring the impedance of a RFID integrated circuit in function of the power and the frequency. This procedure is used to define the impedance value of the chip when the tag is designed to operate in different conditions from standard applications. An analysis of the tags performance is also presented for the case where the tag is adapted to input impedance defined...
A design procedure of a special UHF RFID tag antenna is presented in this paper. The final antenna is matched well with the ST Microelectronics XRAG2 chip at the intended resonant frequency with bandwidth of 33 MHz and has omni-directional beam patterns with gain of 1.86 dBi. A prototype has been successfully fabricated, tested by Rohde & Shwarz ZVB Vector Network Analyzer and showed good fit...
The knowledge of binary RFID chip impedance is exploited for tag antenna design and applied to the NXP G2XL chip. The impedance states are measured with respect to frequency and input power on the chip. An analytical model is used to predict the optimal antenna impedance that corresponds to the maximum backscattered power from the tag. Automated antenna design tool with original shape generation is...
RFID (Radio Frequency IDentification) is a very widely used technology and is still rapidly developing. RFID uses include tracking equipment, goods, animals, etc. Tracking helps a business optimize their processes thus reducing operating cost. As a result, there is an increased need for accurate and fast design of the RF portion of RFID systems. In this tutorial overview we show how easily it can...
An RFID-based chemical sensor is being developed for detecting biological warfare agents (BWA). When interrogated with a reader, the sensor responds with a positive or a negative reading. Future versions of the sensor will also identify the type of agent present. The chemical sensor comes with its own packaging, is glued to the substrate and interfaces with the RFID chip via a circuit. The antenna...
In this study, the research on antenna designing method and overall process were performed in order to apply the RFID tag used at UHF band. Also, the chip impedance measured and antenna impedance had been examined for impedance matching. Through the simulation, the radiation pattern can come out as Omni-directional form at the RFID tag with Au wire bonding between the antenna and the chip. As the...
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