9 research outputs found
Frequency Coded Chipless RFID Tag using Spurline Resonators
A novel compact chipless RFID tag using spurline resonators is discussed in this paper. The detection of the tag's ID is using the spectral signature of a spurline resonator circuit. The tag has a data capacity of 8-bits in the range 2.38 to 4.04 GHz. The tag consists of a spurline multiresonating circuit and two cross polarised antennas. The prototype of the tag is fabricated on a substrate C-MET/LK4.3 of dielectric constant 4.3 and loss tangent 0.0018. The measured results show that group delay response can also be used to decode the tag’s identity
Design and Development of Compact Chipless RFID Tags with High Data Encoding Capacity
The main objective of this thesis is to develop a compact chipless RFID
tag with high data encoding capacity. The design and development of chipless
RFID tag based on multiresonator and multiscatterer methods are presented
first. An RFID tag using using SIR capable of 79bits is proposed. The thesis
also deals with some of the properties of SIR like harmonic separation,
independent control on resonant modes and the capability to change the
electrical length. A chipless RFID reader working in a frequency band of
2.36GHz to 2.54GHz has been designed to show the feasibility of the RFID
system. For a practical system, a new approach based on UWB Impulse Radar
(UWB IR) technology is employed and the decoding methods from noisy
backscattered signal are successfully demonstrated. The thesis also proposes a
simple calibration procedure, which is able to decode the backscattered signal
up to a distance of 80cm with 1mW output power.Cochin University of Science & Technolog
Investigation of Split-Ring-Resonator as a Sensor for Diagnosing Electron Density for Plasma Applications
Investigation of Split-Ring-Resonator as a Sensor for Diagnosing Electron Density for Plasma Applications
Properties of Stepped Impedance Resonator and its application in the design of Chipless RFID tag
Low cost chipless tag with multi-bit encoding technique
A novel compact chipless RFID tag with multiple bit encoding using Stepped Impedance Resonator (SIR) is proposed. Unique code of the tag is encrypted in the frequency spectrum by incorporating variations in magnitude of the scattered field. Fundamental mode and first harmonics of the SIR is effectively utilized to represent the data. Two bit information can be represented by one SIR, therefore the tag is capable to represent 22N number of bit combinations with N resonators. A prototype of the tag is fabricated on a substrate of dielectric constant 4.4 and loss tangent 0.0018. Working model of SIR tag with 2 bit representation is demonstrated in this paper. © 2013 IEEE
Chipless RFID Tag Using Multiple Microstrip Open Stub Resonators
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 for
enhancing the performance of the RFID tag is also proposed. Magnitude
or group delay response can be used to decode the tag informationsCochin University of Science
and TechnologyAntennas and Propagation, IEEE Transactions on,VOL 60,issue 9,pp 4428-443
A Planar Compact Metamaterialinspired Broadband Antenna
An electrically small, broadband-modified, truncated
ground metamaterial EZ antenna is presented. This, a modified EZ
antenna system, achieves a larger bandwidth of the order of 650 MHz
by adjusting the metamaterial-inspired meandered ground element fed
by a top loaded monopole. The design is devoid of the large ground
planes and the external parasitic elements used in conventional
designs for achieving proper impedance matching characteristics. The
antenna requires a small foot print of kg/5 3 kg/10, where kg is the
guided wavelength corresponding to the lowest frequency of operation,
when printed on a substrate of dielectric constant 4.4 and thickness
1.6 mm. The antenna offers a 2:1 VSWR bandwidth from 750
MHz to 1.4 GHz, which covers CDMA, GSM, and ISM bandsCochin University of Science and
TechnologyMICROWAVE AND OPTICAL TECHNOLOGY LETTERS / Vol. 56, No. 3, March 201