Low TB radio SAW sensors incorporating chirped transducers and reflectors for wireless pressure sensing applications

Author

Pankratz, T. ; Scherr, H. ; Reindl, L. ; Ruppel, C.C.W. ; Weigel, R.

Author_Institution

Inst. fur Commun. & Inf. Eng., Linz Univ., Austria

Volume

2

fYear

1998

fDate

7-12 June 1998

Firstpage

845

Abstract

We report on the design and performance of two basic SAW delay line structures developed for a wireless pressure sensing system operating at 434 MHz. The pressure sensor has been fabricated in all-quartz-package (AQP) technology with the SAW structures being placed on a diaphragm inside the hermetically sealed cavity. Both SAW structures show a linear phase although they both incorporate chirped SAW components for enhancing the sensor sensitivity. They have low time-bandwidth (TB) products of 2 and 11, respectively. We attained an improvement of the sensor sensitivity by factors of up to 20 compared to sensors employing non-dispersive SAW components.

Keywords

chirp modulation; pressure sensors; surface acoustic wave delay lines; surface acoustic wave sensors; 434 MHz; all-quartz-package technology; chirped transducers; delay line structures; hermetically sealed cavity; radio SAW sensors; reflectors; sensor sensitivity; time-bandwidth products; wireless pressure sensing applications; Chirp; Delay effects; Delay lines; Dipole antennas; Sensor phenomena and characterization; Stress; Surface acoustic waves; Transducers; Transponders; Wireless sensor networks;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 1998 IEEE MTT-S International

Conference_Location

Baltimore, MD, USA

ISSN

0149-645X

Print_ISBN

0-7803-4471-5

Type

conf

DOI

10.1109/MWSYM.1998.705122

Filename

705122