Title

Low Loss Saw Rf Id Tags For Space Applications

Abstract

NASA has identified the need for wireless, passive for ground,in-flight,and space exploration.In general,must simultaneously sense and tag measurands, such as or pressure, in a multi-sensor environment. SAW devices are ideally suited since they are passive, small, , operate over broad temperatures, and are radiation hard. a passive, wireless multi-sensor environment, the communication of the sensor-tag is related to its insertion loss and processing gain of the system. To maximize the tag readable , the reduction of tag insertion loss is critical. Single CDMA tags for high volume commercial applications have universal coding schemes and large numbers of codes [1]. The large number of bits for coding and CDMA operation reflector banks with > 30 dB loss. The relaxation these parameters allows the design emphasis to be shifted low-loss reflectors. The use of multiple frequency coded tags [2] reduces adjacent reflector interactions for low insertion loss (< 4dB), increased system operation dista e, complex coding, system processing gain. The semi-custom SAW sensor devices low loss platforms for multi-sensor integration and diverse are possible. The goal of the current research to develop a very low loss SAW tag-sensor platform for use in broad range of sensing applications. The paper will discuss reflector design aspects with respect to a communication , without reference to any particular sensor. The goal isreduce the coded reflector bank insertion loss to less than 4 dB investigating long reflector banks that use a pseudo-orthogonal coding (P-OFC) definition that reduces intra-chip reflections optimizes spectral bandwidth of the device. The new approach is defined and contrasted with the previously orthogonal frequency coded (OFC) technique [2]. Autoand correlation properties of the chips and their relation to per strip and reflector length are discussed. Frequency time-domain inter-symbol interference will be compared and with respect to system performance. Results at 250 of a single frequency CD A tag will be compared to 8 OFC, and pseudo-orthogonal frequency coded P-OFC SAW . The key parameters of insertion loss, cross-correlation and correlation of the two types of frequency coded tags will analyzed, contrasted and discussed. It is shown that coded. © 2008 IEEE.

Publication Date

12-1-2008

Publication Title

Proceedings - IEEE Ultrasonics Symposium

Number of Pages

292-295

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/ULTSYM.2008.0072

Socpus ID

67649366430 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/67649366430

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