High Drive Voltage Studies on Lithium Niobate Length Extensional Resonators and Their Generated Quasistatic Electric Fields

• Published in: 2023 IEEE International Ultrasonics Symposium (IUS) pp. 1 - 4
• Main Authors: Wilson, Tristan A., Sherrit, Stewart, Nagaraja, Srinivas Prasad Mysore, Feyissa, Brook, Willey, Devin, Arumugam, Darmindra D.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 03.09.2023
• Subjects: acoustically-driven transmitter; Crystals; electroquasistatic fields; high voltage; Lithium niobate; mechanical antennas; mechtennas; Performance evaluation; Piezoelectric transmitter; Q-factor; Transmitters; Transmitting antennas; Voltage
• ISSN: 1948-5727
• DOI: 10.1109/IUS51837.2023.10307273

Piezoelectrically-driven transmitters are steadily gaining attention from researchers that are interested in developing small form-factor communication and tracking systems operating in the Very Low Frequency (3-30 kHz) and Low Frequency (30-300 kHz) regimes. Traditional Electrically Small Antennas (ESAs) operating in these bands have bulky matching circuits and low radiation efficiencies due to fundamental quality factor limitations. Piezoelectric transmitters are desirable for operation in these bands because they are physically much smaller than ESAs and have much higher radiation efficiencies. These transmitters generate quasistatic electric fields, the magnitude of which can be increased by either increasing the Q-factor of the system or increasing the magnitude of the excitation signal. This paper investigates the radiated electric field response of a Lithium Niobate (LN) transmitter as the peak-to-peak input signal is steadily increased to 1 kV. Length extensional resonance analysis of the LN crystal is presented along with experimental results showing the increase in generated electric field as a function of supplied voltage.