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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Broadband Linear Polarization Conversion Metasurface Based on Grounded Vias
摘要： An anisotropic high-impedance surfaces is applied to achieve perfect polarization rotation. Three multiple resonances are generated by electric and magnetic resonances which contributed to bandwidth expansion of the proposed polarization converter. The simulation results showed that maximum conversion ef?ciency is nearly 100% at mentioned three resonance frequencies. Here, 107 % bandwidth with polarization conversion ratio of above 90% is achieved. The proposed polarization conversion unit-cell is examined for oblique incidence, as well. It is observed that the bandwidth of the proposed unit-cell is not sensitive to the non-orthogonal incidence angles up to 40?. This observation veri?es applicability of proposed polarization rotator unit-cell.
关键词： polarization conversion,metasurface,high impedance surface
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE Indian Conference on Antennas and Propogation (InCAP) - Hyderabad, India (2018.12.16-2018.12.19)] 2018 IEEE Indian Conference on Antennas and Propogation (InCAP) - UHF Wideband Near-Field Coupled Antenna
摘要： In this work we present a near-?eld coupled antenna pair for UHF-RFID operation. The antenna pair is a suitable choice for applications involving detection of RFID tags inside an enclosure, where the power is coupled into the enclosure using the near-?eld coupling of the proposed antenna pair. The important design parameters of the antenna for the optimum performance in the coupled mode are presented and discussed. The proposed antenna pair presents a coupling better than 2 dB from 850 MHz to 950 MHz thus operable in the entire RFID frequency range.
关键词： high impedance surface,loop antennas,near-?eld coupling,UHF,RFID
更新于2025-09-11 14:15:04
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Compact Scalable Modeling of Chipless RFID Tag Based on High-Impedance Surface
摘要： This paper proposes a compact model for chipless radio frequency identification (RFID) tag. This compact scalable model consists of capacitors, inductors, and resistors of which their values are directly described by the physical dimension of the chipless tag. Moreover, based on this compact model, radar cross section of chipless RFID tag is predicted, by analyzing polarizability based on surface current distribution in different modes. To validate the proposed model, a 5-bit chipless RFID tag based on high-impedance surface (HIS) is presented, with good agreement among modeled, simulated, and measured results. A wide range of physical parameters have also been validated to show the scalability. This compact scalable model of chipless RFID tag not only simplifies the tag design, but also provides an insight understanding of the HIS structure.
关键词： radar cross section (RCS),high-impedance surface (HIS),equivalent circuit modeling,Chipless radio frequency identification (RFID) tag,surface current distribution
更新于2025-09-10 09:29:36
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Design of Millimetre Wave Phase Shifting Periodic Metasurfaces
摘要： A high impedance surface capable of analogue phase shifting in the millimetre wave band has been simulated and is realisable with the use of piezoelectric actuators with enhanced displacement. The phase shifter demonstrates a signi?cantly higher bandwidth and frequency range, along with lower losses, than previously proposed systems. Tuning can be achieved with a single, mechanically ampli?ed, piezoelectric actuator. Using the available displacement provided by such actuators, it has been demonstrated that over 200 degrees of phase shift should be achievable over a 27 GHz band when utilising the improved patch unit cell.
关键词： phase shifter,high impedance surface,millimetre wave
更新于2025-09-04 15:30:14
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UHF Reader Antenna for Near and Far-Field RFID Operation
摘要： In order to detect the RFID tags kept inside an enclosure, the reader antenna can couple energy into another antenna kept in the near-field region. To detect the tags placed in the far-field, the reader antenna should have a good gain. Usually, these two requirements compete with each other due to the effect of coupling on the frequency of operation of the antenna system. In this work modification to a loop antenna is proposed such that it can operate in both near and far-field. Loop antenna with high impedance surface (HIS) reflector results in a low-profile antenna pair where both the antennas can interchangeably operate in near-field and far-field, with their operating frequency band independent of the spacing between the antennas. The performance of the proposed antennas is compared with that of several other antennas by measuring the read range of RFID tags. It is found that the proposed antennas perform better in comparison with the other antennas when detecting the tags placed inside an enclosure. When operating as a far-field antenna, their performance is very close to that of a conventional RFID reader antenna which is optimized only for far-field operation.
关键词： near-field coupling,far-field near-field antenna,RFID,UHF,high impedance surface,loop antennas
更新于2025-09-04 15:30:14