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A high Q piezoelectric resonator as a portable VLF transmitter.

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.

SUBMITTER: Kemp MA

PROVIDER: S-EPMC6461683 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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A high Q piezoelectric resonator as a portable VLF transmitter.

Kemp Mark A MA Franzi Matt M Haase Andy A Jongewaard Erik E Whittaker Matthew T MT Kirkpatrick Michael M Sparr Robert R

Nature communications 20190412 1

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 p ...[more]

PMID: 30979897

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