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High-Performance SAW Resonator on New Multilayered Substrate Using LiTaO3 Crystal
Summary
Researchers developed a novel multilayered substrate for surface acoustic wave (SAW) resonators, significantly enhancing resonator quality (Q) and temperature stability for mobile communication devices.
Area of Science:
- Materials Science
- Acoustic Engineering
- Electrical Engineering
Background:
- High-performance filters and duplexers are crucial for modern mobile handset frequency bands.
- Existing surface acoustic wave (SAW) resonators require improved quality (Q) and temperature coefficient of frequency (TCF) for advanced applications.
- Acoustic energy confinement in the depth direction is key to enhancing SAW resonator performance.
Purpose of the Study:
- To develop a SAW resonator with higher Q and lower TCF for long-term evolution (LTE) frequency bands.
- To investigate acoustic energy confinement in a rotated Y-X LiTaO3 (LT) substrate using multilayered structures.
- To design and fabricate a novel multilayered substrate for improved SAW resonator performance.
Main Methods:
- Numerical simulation using the finite-element method (FEM) to analyze multilayered substrates (LT with SiO2 and AlN layers).
- Evaluation of acoustic energy distribution, phase velocity, coupling coefficient, and temperature characteristics.
- Fabrication and experimental testing of a one-port SAW resonator utilizing the novel multilayered substrate.
Main Results:
- A novel multilayered substrate using SiO2 (low-impedance) and AlN (high-impedance) under a thin LT layer was developed.
- The fabricated resonator achieved a Bode-Q over 4000 and a TCF of -8 ppm/°C.
- Performance metrics showed a fourfold increase in Q and a fivefold decrease in TCF compared to conventional 4° YX-LT SAW resonators.
- A band 25 duplexer using this technology exhibited very narrow duplex gap, extremely low insertion loss, steep cutoff, and stable temperature characteristics.
Conclusions:
- The developed multilayered substrate effectively confines acoustic energy, significantly boosting SAW resonator Q and temperature stability.
- This technology enables the creation of high-performance duplexers for advanced mobile communication systems.
- The findings pave the way for more efficient and reliable mobile handset filters and duplexers.
