Near-Field Credit Card-Sized Chipless RFID Tags Using Higher-Order Mode Resonance Frequencies of Transmission Line Resonators

The paper presents a triband circular polarized rectangular dielectric resonator antenna. A single coaxial cable feeds the DRA to a double stub strip on the DRA side. A patch strip coupled to the feed assists in widening the bandwidth of the proposed DRA. The degenerate mode pair TE∂11x and higher-TE∂23x has been excited to achieve CP and enhance the antenna gain. The higher-order mode has been excited using a low-cost simple excitation mechanism without compromising on the size and shape of the DRA. An impedance bandwidth of 48% with a gain ~6–9 dBic was achieved in all resonance frequencies. Additionally, the AR bandwidth of 5.5%, 4.2%, and 2.76% was obtained at three different frequencies. Note that the proposed DRA exhibits a wide beamwidth of 112o, which is good for better signal reception. A comparison between the measured with simulated results shows that the measured results are matched by the simulated result trends.

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Strong near-field couplings of anapole modes and the formation of higher-order electromagnetic modes in stacked all-dielectric nanodisks

Chinese Physics B ◽

10.1088/1674-1056/ac3bac ◽

2021 ◽

Author(s):

Bin Liu ◽

Ma-Long Hu ◽

Yi-Wen Zhang ◽

Yue You ◽

Zhao-Guo Liang ◽

...

Keyword(s):

Electric Dipole ◽

Near Field ◽

Higher Order ◽

Dipole Mode ◽

Order Mode ◽

Quadrupole Mode ◽

Higher Order Modes ◽

Scattering Spectrum ◽

Magnetic Dipole Resonances ◽

Higher Order Mode

Abstract We theoretically study the near-field couplings of two stacked all-dielectric nanodisks, where each disk has an electric anapole mode consisting of an electric dipole mode and an electric toroidal dipole (ETD) mode. Strong bonding and anti-bonding hybridizations of the ETD modes of the two disks can occur. The bonding-hybridized ETD can interfere with the dimer's electric dipole mode and induce a new electric anapole mode. The anti-bonding hybridization of the ETD modes can induce a magnetic toroidal dipole (MTD) response in the disk dimer. The MTD and magnetic dipole resonances of the dimer form a magnetic anapole mode. Thus, two dips associated with the hybridized modes appear on the scattering spectrum of the dimer. Furthermore, the MTD mode is also accompanied by an electric toroidal quadrupole mode. The hybridizations of the ETD and the induced higher-order modes can be adjusted by varying the geometries of the disks. The strong anapole mode couplings and the corresponding rich higher-order mode responses in simple all-dielectric nanostructures can provide new opportunities for nanoscale optical manipulations.

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Programmable Organic Chipless RFID Tags Inkjet Printed on Paper Substrates

Applied Sciences ◽

10.3390/app11177832 ◽

2021 ◽

Vol 11 (17) ◽

pp. 7832

Author(s):

Miquel Moras ◽

Carme Martínez-Domingo ◽

Roger Escudé ◽

Cristian Herrojo ◽

Ferran Paredes ◽

...

Keyword(s):

Transmission Line ◽

Resonance Frequency ◽

Manufacturing Process ◽

Near Field ◽

Harmonic Signal ◽

Rfid Tags ◽

Paper Substrate ◽

Rfid Tag ◽

Chipless Rfid ◽

Paper Substrates

In this paper, an organic, fully recyclable and eco-friendly 20-bit inkjet-printed chipless RFID tag is presented. The tag operates in the near field and is implemented by means of chains of resonant elements. The characterization and manufacturing process of the tag, printed with a few layers of a commercial organic ink on conventional paper substrate (DIN A4), are presented, and tag functionality is demonstrated by reading it by means of a custom-designed reader. The tags are read by proximity (through the near field), by displacing them over a resonator-loaded transmission line, and each resonant element (bit) of the tag is interrogated by a harmonic signal tuned to the resonance frequency. The coupling between the reader line and the resonant elements of the tag produce and amplitude modulated (AM) signal containing the identification (ID) code of the tag.

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