Spread Spectrum Orthogonal Frequency Coded SAW Tags and Sensors Using Harmonic Operation

    Authors

    D. R. Gallagher; M. W. Gallagher; N. Saldanha; J. M. Pavlina;D. C. Malocha

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Microw. Theory Tech.

    Keywords

    Acoustic devices; harmonic generation; microsensors; multisensor; systems; orthogonal frequency coding (OFC); sensors; spread spectrum; communication; surface acoustic waves (SAWs); SAW devices; Engineering, Electrical & Electronic

    Abstract

    This paper presents a preliminary investigation of orthogonal frequency coding (OFC) surface acoustic wave tags and sensors at a 500- and 900-MHz operational frequency range using conventional contact lithography techniques. The higher frequency devices are achieved using second harmonic operation; eliminating the need for advanced lithography techniques. The objective of this effort is to increase the technology readiness level of wideband OFC tags at higher frequencies. Measured device results are presented and compared with coupling of modes model predictions to demonstrate performance. The fundamental and harmonic device response is compared for devices designed for operation in the 900-MHz frequency band. The experimental correlation against an ideal matched filter is also presented.

    Journal Title

    Ieee Transactions on Microwave Theory and Techniques

    Volume

    58

    Issue/Number

    3

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    674

    Last Page

    679

    WOS Identifier

    WOS:000275559700021

    ISSN

    0018-9480

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