A high Q piezoelectric resonator as a portable VLF transmitter

Mark A. Kemp (), Matt Franzi, Andy Haase, Erik Jongewaard, Matthew T. Whittaker, Michael Kirkpatrick and Robert Sparr
Additional contact information
Mark A. Kemp: SLAC National Accelerator Laboratory
Matt Franzi: SLAC National Accelerator Laboratory
Andy Haase: SLAC National Accelerator Laboratory
Erik Jongewaard: SLAC National Accelerator Laboratory
Matthew T. Whittaker: Gooch and Housego, LLC.
Michael Kirkpatrick: SRI International
Robert Sparr: SRI International

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Very low frequency communication systems (3 kHz–30 kHz) enable applications not feasible at higher frequencies. However, the highest radiation efficiency antennas require size at the scale of the wavelength (here, >1 km), making portable transmitters extremely challenging. Facilitating transmitters at the 10 cm scale, we demonstrate an ultra-low loss lithium niobate piezoelectric electric dipole driven at acoustic resonance that radiates with greater than 300x higher efficiency compared to the previous state of the art at a comparable electrical size. A piezoelectric radiating element eliminates the need for large impedance matching networks as it self-resonates at the acoustic wavelength. Temporal modulation of this resonance demonstrates a device bandwidth greater than 83x beyond the conventional Bode-Fano limit, thus increasing the transmitter bitrate while still minimizing losses. These results will open new applications for portable, electrically small antennas.

Date: 2019
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DOI: 10.1038/s41467-019-09680-2

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