C-Axiszig-zag polarization inverted ScAlN multilayer for FBAR transformer rectifying antenna

Rei Karasawa, Takahiko Yanagitani

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Energy harvesting from surrounding electromagnetic wave can satisfy the increasing demand of trillions of wireless sensors for IoT. RF energy harvesting is generally achieved by RF-DC conversion using a rectifying antenna (called rectenna). For weak RF signal, however, RF-DC conversion efficiency significantly decreases because weak RF signal cannot activate the diode in the rectenna. Therefore, in order to obtain high conversion efficiency for a weak signal, a Dickson charge pump[1] is generally used to increase the RF voltage. However, their low efficiency, poor impedance matching, and large size are the problem. In this study, to overcome this problem, we introduce the RF energy harvester consisting of a new type of polarization inverted FBAR transformer and rectenna. As shown in Fig.1 (a), RF input signal can be increased 7 times when 8 polarization inversion layered FBAR transformer is used. We previously reported various polarization inverted structure such as (0001)/(000-1) ScAlN films [2] and (-1-120)/(11-20) AlN films [3]. We here reports the eight layer of c-axis zig-zag polarization inverted ScAlN stack transformer resonator. [1] A. Parks, et al. Proc. IEEE WiSNET, (2013). [2] M. Suzuki, T. Yanagitani, and H. Odagawa, Appl. Phys. Lett. (2014) [3] M. Suzuki, T. Yanagitani, IUS 2011, 4C-2 (2011).

    Original languageEnglish
    Title of host publication2017 IEEE International Ultrasonics Symposium, IUS 2017
    PublisherIEEE Computer Society
    ISBN (Electronic)9781538633830
    DOIs
    Publication statusPublished - 2017 Oct 31
    Event2017 IEEE International Ultrasonics Symposium, IUS 2017 - Washington, United States
    Duration: 2017 Sep 62017 Sep 9

    Other

    Other2017 IEEE International Ultrasonics Symposium, IUS 2017
    CountryUnited States
    CityWashington
    Period17/9/617/9/9

    Fingerprint

    transformers
    antennas
    polarization
    Inertial Upper Stage
    direct current
    impedance matching
    energy
    electromagnetic radiation
    resonators
    diodes
    inversions
    pumps
    sensors
    electric potential

    ASJC Scopus subject areas

    • Acoustics and Ultrasonics

    Cite this

    Karasawa, R., & Yanagitani, T. (2017). C-Axiszig-zag polarization inverted ScAlN multilayer for FBAR transformer rectifying antenna. In 2017 IEEE International Ultrasonics Symposium, IUS 2017 [8092551] IEEE Computer Society. https://doi.org/10.1109/ULTSYM.2017.8092551

    C-Axiszig-zag polarization inverted ScAlN multilayer for FBAR transformer rectifying antenna. / Karasawa, Rei; Yanagitani, Takahiko.

    2017 IEEE International Ultrasonics Symposium, IUS 2017. IEEE Computer Society, 2017. 8092551.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Karasawa, R & Yanagitani, T 2017, C-Axiszig-zag polarization inverted ScAlN multilayer for FBAR transformer rectifying antenna. in 2017 IEEE International Ultrasonics Symposium, IUS 2017., 8092551, IEEE Computer Society, 2017 IEEE International Ultrasonics Symposium, IUS 2017, Washington, United States, 17/9/6. https://doi.org/10.1109/ULTSYM.2017.8092551
    Karasawa R, Yanagitani T. C-Axiszig-zag polarization inverted ScAlN multilayer for FBAR transformer rectifying antenna. In 2017 IEEE International Ultrasonics Symposium, IUS 2017. IEEE Computer Society. 2017. 8092551 https://doi.org/10.1109/ULTSYM.2017.8092551
    Karasawa, Rei ; Yanagitani, Takahiko. / C-Axiszig-zag polarization inverted ScAlN multilayer for FBAR transformer rectifying antenna. 2017 IEEE International Ultrasonics Symposium, IUS 2017. IEEE Computer Society, 2017.
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