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    This study introduces a new design for surface acoustic wave identification tags (ID-tags) using connected interdigital transducers (IDTs) to boost signal amplitude. This innovation enhances remote interrogation range, even for high-temperature materials.

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    Area of Science:

    • Acoustic wave devices
    • Surface acoustic wave (SAW) sensors
    • Radio frequency (RF) identification

    Background:

    • Standard surface acoustic wave identification tags (ID-tags) rely on high coupling coefficient (K²) and low propagation losses for effective remote interrogation.
    • Conventional ID-tag configurations using a single interdigital transducer (IDT) and reflectors limit interrogation scope and performance with certain materials.

    Purpose of the Study:

    • To propose and validate an alternative ID-tag configuration using a series of electrically connected IDTs to enhance signal amplitude.
    • To improve the interrogation range of ID-tags, particularly for materials suitable for harsh, high-temperature environments.

    Main Methods:

    • Replaced conventional ID-tag design (one IDT, multiple reflectors) with a series of electrically connected IDTs for direct signal transmission.
    • Validated the concept using lithium niobate (LiNbO₃) 128° Y-X cut substrates, comparing experimental and numerical results.
    • Tested the connected IDT concept on langasite (La₃Ga₅SiO₁₄) substrates for high-temperature applications, performing in situ RF characterization up to 600 °C.

    Main Results:

    • The connected IDT configuration demonstrated increased signal amplitude compared to standard designs.
    • Good agreement was observed between experimental and numerical outcomes for the connected IDT concept on lithium niobate.
    • The langasite substrate exhibited promising performance at high temperatures, with unexpected resilience noted for congruent lithium niobate devices.

    Conclusions:

    • The proposed connected IDT configuration offers a viable method to enhance signal amplitude and interrogation scope for surface acoustic wave ID-tags.
    • This approach extends the applicability of ID-tags to challenging environments using materials like langasite, previously limited by performance.
    • Further investigation into the high-temperature resilience of lithium niobate-based devices is warranted based on observed results.