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Gorgier, Switzerland

Plessky V.P.,GVR Trade SA | Reindl L.M.,Albert Ludwigs University of Freiburg
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

SAW tags were invented more than 30 years ago, but only today are the conditions united for mass application of this technology. The devices in the 2.4-GHz ISM band can be routinely produced with optical lithography, high-resolution radar systems can be built up using highly sophisticated, but low-cost RF-chips, and the Internet is available for global access to the tag databases. The "Internet of Things," or I-o-T, will demand trillions of cheap tags and sensors. The SAW tags can overcome semiconductor-based analogs in many aspects: they can be read at a distance of a few meters with readers radiating power levels 2 to 3 orders lower, they are cheap, and they can operate in robust environments. Passive SAW tags are easily combined with sensors. Even the "anti-collision" problem (i.e., the simultaneous reading of many nearby tags) has adequate solutions for many practical applications. In this paper, we discuss the state-of-the-art in the development of SAW tags. The design approaches will be reviewed and optimal tag designs, as well as encoding methods, will be demonstrated. We discuss ways to reduce the size and cost of these devices. A few practical examples of tags using a timeposition coding with 106 different codes will be demonstrated. Phase-coded devices can additionally increase the number of codes at the expense of a reduction of reading distance. We also discuss new and exciting perspectives of using ultra wide band (UWB) technology for SAW-tag systems. The wide frequency band available for this standard provides a great opportunity for SAW tags to be radically reduced in size to about 1 × 1 mm2 while keeping a practically infinite number of possible different codes. Finally, the reader technology will be discussed, as well as detailed comparison made between SAW tags and IC-based semiconductor device. © 2006 IEEE. Source

Plessky V.,GVR Trade SA | Lamothe M.,French National Center for Scientific Research | Davis Z.,Danish Technological Institute DTI | Suchkov S.,Chernyshevsky Saratov State University
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

The possibility of using 6-GHz frequencies for passive SAW tags is discussed. An example of an inline 6-GHz SAW tag design is presented. Supposing that an ultrawide frequency bandwidth B = 775 MHz can be used, the tag dimensions can be significantly reduced and the loss of reflected response remains at an acceptable level of around 50 dB. The devices were manufactured using E-beam lithography and, probed on wafer, show performance close to predicted, including the loss level of approximately 55 dB. The possibility of high-throughput manufacturing by combining nano-imprint and e-beam lithography is discussed. © 1986-2012 IEEE. Source

Cerda-Villafana G.,University of Guanajuato | Ibarra-Manzano O.,University of Guanajuato | Shmaliy Y.S.,University of Guanajuato | Plessky V.,GVR Trade SA
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings

We discuss the code reading error probability (EP) in the radio frequency identification (RFID) surface acoustic wave tags with pulse position coding and peak-pulse detection. EP is found in the most general form assuming M groups of codes with N slots each and allowing individual signal-to-noise ratios (SNRs) in each slot. We show that if the RFID tag is designed such that the spurious responses are attenuated on more than 20 dB below On-pulses, then EP can be achieved at the level of 10 -8 (one false per 10 8 readings) with SNR > 17 dB for any reasonable M and N. © 2012 IEEE. Source

Plessky V.,GVR Trade SA | Yantchev V.,Uppsala University
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

In a narrowband 2-port resonator on 37°cut quartz with Al electrodes (hAlu = 100 nm) exploiting surface transverse waves (STW), we have observed parasitic ripples which have been attributed to transverse modes unusually situated on the left side of the main resonance. To suppress these modes, we have used metallization coefficient weighting across the aperture, with more metal in the middle and reduced metallization close to the busbars. The parasitic modes indeed disappeared, but at significantly higher frequency, we have found an additional strong response which does not exist in a resonator with uniform electrode metallization. 3-D simulations showed that the structure has another very different mode, with the wave propagating mainly along the edge of the busbars, but excited with the interdigital electrode system. © 1986-2012 IEEE. Source

Plessky V.P.,GVR Trade SA | Davis Z.J.,Center for Micro and Nanotechnology | Lamothe M.,French National Center for Scientific Research | Suchkov S.G.,Chernyshevsky Saratov State University
IEEE International Ultrasonics Symposium, IUS

At the last IEEE Ultrasonics Symposiun in Prague (2013) we have shown theoretically the feasibility of 6 GHz SAW-tags with acceptable performance. In this paper we report experimental results for this device. We have also used the Nano-Imprint-Lithography (NIL) for manufacturing a few different SAW test devices operating at the 2-5 GHz frequency range - delay lines (DL), reflective DL and sensors. Corresponding measurement data are presented. The frequencies higher 3 GHz, although inaccessible for SAW devices produced by optical lithography, represent great interest for many applications. NIL technology has a potential of cheap mass-production tool for SAW devices in this range. We have fabricated a number of prototypes 6 GHz SAW-tag devices using electron beam lithography on a 4-inch Lithium Niobate 128° cut substrate. Then e-beam writing is performed using a state-of-the-art, JEOL JBX-9500 and sequentially developed using a standard wet development method. Finally, 50 nm of Al is deposited and lift-off is performed, leaving the Al in the desires SAW ID-tag pattern. The NIL process consists of imprinting using a Imrio100 J-FIL process followed by a tailored dry development process and finally metallization and lift-off. Ultra-Wide-Band (UWB) reflective delay lines suitable for SAW senstor operation in 2 GHz-3 GHz range have been manufactured. The 6GHz devices have such attractive features as small size (0.9 × 2.0 mm2), loss level comparable with that of devices operating in 2.45 GHz ISM band, large information capacity because of available Ultra-Wide-Band of frequencies. © 2014 IEEE. Source

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