Packaging and antenna design for wireless SAW temperature sensors in metallic environments

A. Binder, R. Fachberger, E. Kaldjob, B. Geck

Research output: Conference proceeding/Chapter in Book/Report/Conference Paperpeer-review

Abstract

We have developed a radio frequency (RF) transponder based on a surface acoustic wave (SAW) device specifically optimized for wireless temperature measurement of rotating shafts. The SAW sensing element is a reflective delay line type with 3 reflectors. The main foci of the paper are on a new compact packaging, and on antenna simulations for 2.4 GHz radio signal transmission to the interrogator. The novel metallic packaging has been designed for smallest possible outer dimensions of 10.0 × 3.1 × 2.0 mm3. In order to streamline the housing for insertion in a borehole, the electrical feedthroughs have been oriented in the longitudinal axis, contrary to the standard vertical axis approach. Antenna simulations were performed to find an optimized design tuned to the metallic surrounding. A slot antenna type was identified as best joint solution for the objectives radiation pattern and antenna gain.
Original languageGerman (Austria)
Title of host publicationSENSORS, 2009 IEEE
Pages807-810
Number of pages4
DOIs
Publication statusPublished - 28 Oct 2009
Externally publishedYes
EventSENSORS, 2009 IEEE - Christchurch, New Zealand
Duration: 25 Oct 200928 Oct 2009

Conference

ConferenceSENSORS, 2009 IEEE
Period25/10/0928/10/09

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