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Nowadays, the labeling of metal objects faces the challenge of getting a large read range while maintaining a reduced antenna size. This contribution presents a tag antenna design for identifying metal objects in the European UHF band (865–868 MHz). The antenna consists of a dipole mounted on a thin dielectric which is coupled to two shorted patches mounted on FR4 substrate. The overall dimensions...
Impedance matching is a constant topic in the RFID community. However, it still heavily depends on the trial-and-error approach, even for the popular T-match. In this paper, the dynamics behind the impedance matching of T-match-dipole tags are studied systematically. Based on the inductance-based model stemmed from the transmission line model, the bandwidth characteristics of diverse matching scenarios...
A novel compact RFID tag employing open stubs in a microstrip transmission line is proposed. The prototype of the tag is fabricated on a substrate of dielectric constant 4.4 and loss tangent 0.0018. A prototype of 8 bit data encoded tag is demonstrated in this paper. Method for finding the resonant frequency and enhancing the performance of the RFID tag are proposed. Magnitude response can be used...
Class D amplifiers find new applications in RFID systems, because of their high efficiency. Most textbooks describe the case of a load directly connected to the amplifier. However, in most RFID systems the usage of a transmission line is mandatory and this may introduce some novel effects, in the form of an infinite series of peaks in the system transfer functions. If not appropriately taken care...
A novel compact RFID tag employing open stubs in a microstrip transmission line is proposed. The prototype of the tag is fabricated on a substrate of dielectric constant 4.4 and loss tangent 0.0018. The tag consists of microstrip open stub resonators and cross polarized transmitting and receiving disc monopole antennas. A prototype of 8 bit data encoded tag is demonstrated in this communication. Method...
A meandered microstrip transmission line based ID generation circuit for chipless radio frequency identification (RFID) tag is presented. The ID generation circuit has been designed using microstrip transmission lines as delay lines for its operation at ultra high frequency (UHF:915MHz). The proposed scheme, after receiving a sinusoidal interrogation input pulse, constructs an on-off-key (OOK) modulated...
We present a harmonic radio frequency identification (RFID) transponder based on reflective nonlinear transmission lines (NLTLs), where the tag size is significantly reduced with single antenna configuration. To show the feasibility and design procedure, two open-ended NLTLs are fabricated in IBM 0.13µm CMOS process. Both of the 0.35 mm by 0.95 mm open-ended NLTLs show around −11 dBm reflected second...
The T-match structure is commonly used to match an RFID chip's reactive impedance to a dipole. Models that describe T-match are known, but they are neither sufficiently accurate to model antennas nor to synthesize the antenna geometry. Here, we present the embedded T-match circuit model, which is amenable to accurate analysis and synthesis.
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
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