UHF RFID chip impedance and sensitivity measurement using a transmission line transformer

Reducing tag size while maintaining good performance is one of the major challenges in radio-frequency identification applications (RFID), in particular when labeling metallic objects. In this contribution, a small size and low cost tag antenna for identifying metal objects in the European UHF band (865–868 MHz) is presented. The antenna consists of a transmission line mounted on an inexpensive thin dielectric which is proximity-coupled to a short-ended patch mounted on FR4 substrate. The overall dimensions of the tag are 33.5 × 30 × 3.1 mm. Experimental results show that, for an EIRP of 3.2 W (European regulations), such a small and cheap tag attains read ranges of about 5 m when attached to a metallic object.

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A simple UHF RFID near-field reader antenna based on micro-stripe transmission line

Proceedings of 2014 3rd Asia-Pacific Conference on Antennas and Propagation ◽

10.1109/apcap.2014.6992450 ◽

2014 ◽

Cited By ~ 2

Author(s):

Tianran Lu ◽

Qi Liu ◽

Yang Yang ◽

Xiaoxiang He

Keyword(s):

Transmission Line ◽

Near Field ◽

Uhf Rfid ◽

Reader Antenna

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New time-domain model for active mode locking, based on the transmission line laser model

IEE Proceedings J Optoelectronics ◽

10.1049/ip-j.1989.0042 ◽

1989 ◽

Vol 136 (5) ◽

pp. 264 ◽

Cited By ~ 19

Author(s):

A.J. Lowery

Keyword(s):

Transmission Line ◽

Time Domain ◽

Mode Locking ◽

Domain Model ◽

Active Mode ◽

Laser Model ◽

New Time

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Design method for antenna arrays employing ferrite printed transmission line phase shifters

IEE Proceedings - Microwaves Antennas and Propagation ◽

10.1049/ip-map:20020146 ◽

2002 ◽

Vol 149 (1) ◽

pp. 33-40 ◽

Cited By ~ 5

Author(s):

A.D. Brown ◽

L.C. Kempel ◽

J.L. Volakis

Keyword(s):

Transmission Line ◽

Antenna Arrays ◽

Design Method ◽

Phase Shifters

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Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

The European Physical Journal Applied Physics ◽

10.1051/epjap/2020200208 ◽

2020 ◽

Vol 92 (2) ◽

pp. 20502

Author(s):

Behrokh Beiranvand ◽

Alexander S. Sobolev ◽

Anton V. Kudryashov

Keyword(s):

Transmission Line ◽

Terahertz Radiation ◽

Transmission Lines ◽

Software Package ◽

Optical Pulses ◽

Capacitively Coupled ◽

Voltage Difference ◽

Left Handed ◽

Microwave Transmission ◽

Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

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