Programmable reflectors for SAW-ID-tags

Abstract

Abslract -Surface acoustic wave devices for identification systems (SAW-ID-tags or SAW wireless labels) have a large potential for future applications. We concentrate in this paper on reflective SAW-IDtags with amplitude modulation.We use splitfinger interdigital transducers as reflecting structures. If the transducers are short circuited or capacitivly loaded the reflection disappears almost entirely. On the other hand, if an open circuit or inductive load is used, the lDTs reflect incoming SAWS. The coding of the reflectors can therefore be done once and for all by a, e.g., photolithographic process or, alternatively, programmable by external circuitry. This new possibility of dynamic programming can be used to transmit time dependent data.We present basic considerations on the design and measurements of prototypes of SAW-ID-tags on YZ-LiNbOS at 285MHz and 2.45GHz.1051-0117/93/0000-0125 $4.00 0 1993 IEEE

TES-Based Light Detectors for the CRESST Direct Dark Matter Search

“…1 Illustration of the phonon-light technique. Example of CRESST-II neutron calibration data displayed in the LY-energy plane [4]. The electron-recoil events (blue band) and nuclear-recoil events (magenta band) are separated using the information provided by the light channel.…”

“…The mean of the electron-recoil band turns below one at small energies due to scintillator non-proportionality [3]. A population of events above the electron-recoil band, called excess-light events, is attributed to external radiation emitting additional light in the scintillating foil [4] (Color figure online) detector resolution yields a more precise measurement of the LY, resulting in narrower bands. This extends the range of high-significance discrimination to lower energies.…”

Wireless neural probes based on one-port SAW delay line and neural firing-dependent varicap diode

“…The one-port SAW delay line is consisted of inter-digital transducers (IDTs) connected to an antenna, shorted-grating reflector as reference, and split-type reflectors connected with varicap diode C load , which makes wireless and battery-free measurement system possible. A change in the voltage-controlled capacitance C load by electrical neural pulses induces perturbation of the reflected responses at split-type reflector on one-port SAW delay line as follows [20][21][22][23][24],…”

Surface Acoustic Wave RFID Tags

“…The main feature of SAW RFID tags (Reindl & Ruile, 1993;Schmidt et al, 1994;Plessky et al 1995;Reindl et al, 1998;Hartmann, 2002) is that they do not use any autonomous power supply such as batteries. Moreover, they do not include any such circuitry that would need to be powered.…”