Development of Enhanced Range, High Q, Passive, Chipless RFID Tags for Continuous Monitoring and Sensing Applications

Abstract

A high Q planar chipless RFID tag with high sensitivity is proposed for communication applications. In particular, the tag structure is composed of a complementary spiral structure (CSS) that is able to provide high sensitivity and compactness. A semi analytical formula for the design of a single bit tag is derived, and the behaviour of the CSS is analysed for different dielectric substrates. Different tags, composed of up to a set of eight resonators, have been numerically and experimentally assessed. In particular, a system prototype composed of a reader and a set of tags are fabricated and experimentally assessed as a proof of concept. The system provided an operative range of tens of centimetres (a maximum operative range of 65 cm). The obtained results are quite promising and the agreement between simulated and measured results are found to be good.

On Chip Modulated Scattering Tag Operating at Millimetric Frequency Band

“…In particular, in [2,3] they have been used in a microwave imaging system, for through-the-wall applications in [4], as long-range radio frequency identification (RFID) tags [5], for the remote inspection of the structural integrity of civil engineering buildings [6], as a sensor for the assessment of air quality [7], and in many IoT systems [8] for sensing applications. Thanks to their compactness, versatility, and capability to operate at microwave frequency bands and high distances, MST tags demonstrated to be a good alternative to RFID and chip-less RFIDs [9][10][11] tags. Sensors operate thanks to the scattering properties of small antennas [12][13][14] and without the need for a local oscillator or modulation section, which at high frequency bands are expensive and also difficult to design.…”

On Chip Modulated Scattering Tag Operating at Millimetric Frequency Band

“…In particular, in [2,3] they have been used in a microwave imaging system, for through-the-wall applications in [4], as long-range RFID tags [5], for the remote inspection of the structural integrity of civil engineering buildings [6], as a sensor for the assessment of air quality [7] and in many IoT systems [8] for sensing applications. Thanks to their compactness, versatility and capability to operate at microwave frequency bands and high distances, MST tags demonstrated to be a good alternative to RFID and chip-less RFIDs [9,10,11] tags. MST tags operate thanks to the scattering properties of small antennas [12,13,14] and without the need for a local oscillator or modulation section, which at high frequency bands are expensive and also difficult to design.…”

A Novel Microstrip Sensor Based on Closed Loop Antenna for Adulteration Detection of Liquid Samples

“…Planar microwave structures finds many applications in various domains [27]- [29]. The different applications using the planar microwave antenna as microwave sensors are discussed in [30]- [38].…”