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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
Transverse modes in one-port SAW resonators
C K Campbell1, P J Edmonson, P M Smith
1Dept. of Electr. and Comput. Eng., McMaster Univ., Hamilton, Ont.
Summary
This study analyzes surface acoustic wave (SAW) resonator frequency responses using a novel 1D approximation for transverse modes. The model accurately predicts the placement of these modes, validated by experimental data from a 280-MHz SAW resonator.
Area of Science:
- Physics
- Electrical Engineering
- Materials Science
Background:
- Surface Acoustic Wave (SAW) resonators are crucial components in electronic filters and sensors.
- Understanding the complex frequency responses, particularly transverse modes, is essential for device optimization.
- Existing models often simplify the two-dimensional nature of SAW propagation.
Purpose of the Study:
- To develop a theoretical model for predicting the S(11) and S(21) frequency responses of one-port SAW resonators.
- To investigate the influence of transverse modes on resonator performance.
- To validate the proposed model against experimental data.
Main Methods:
- Utilized one-dimensional coupling-of-modes and transmission-matrix analysis.
- Approximated the two-dimensional problem by summing one-dimensional mode responses for each transverse mode.
- Compared theoretical predictions with experimental data from a commercial 280-MHz SAW resonator.
Main Results:
- The model successfully predicts the S(11) and S(21) frequency responses, including the impact of transverse modes.
- Good agreement was observed between the theoretical model and experimental results for the placement of transverse modes.
- The 1D approximation effectively captures key aspects of the 2D SAW resonator behavior.
Conclusions:
- The developed theoretical framework provides an accurate method for analyzing SAW resonator frequency responses.
- The summation of 1D mode responses offers a viable approach to modeling 2D effects in SAW devices.
- This work contributes to the improved design and understanding of high-frequency SAW resonators.
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