Title :
Programmable reflectors for SAW-ID-tags
Author :
Reindl, Leonhard ; Ruile, Werner
Author_Institution :
Corp. Res. & Dev., Siemens AG, Munich
fDate :
31 Oct-3 Nov 1993
Abstract :
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-ID-tags with amplitude modulation. We use splitfinger interdigital transducers as reflecting structures. If the transducers are short circuited or capacitively loaded the reflection disappears almost entirely. On the other hand, if an open circuit or inductive load is used, the IDTs reflect incoming SAWs. The coding of the reflectors ran 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. The present basic considerations on the design and measurements of prototypes of SAW-ID-tags on YZ-LiNbO3 at 285 MHz and 2.45 GHz
Keywords :
piezoelectric transducers; surface acoustic wave devices; ultrasonic transducers; 2.45 GHz; 285 MHz; LiNbO3; SAW wireless labels; SAW-ID-tags; YZ-LiNbO3; amplitude modulation; dynamic programming; identification systems; photolithographic; programmable reflectors; splitfinger interdigital transducers; Acoustic reflection; Acoustic transducers; Acoustic waves; Amplitude modulation; Circuits; Dynamic programming; Prototypes; Radio access networks; Surface acoustic wave devices; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1993. Proceedings., IEEE 1993
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1993.339692
