Dual-Mode SAW Filter Structure for Multi-Band 5G Miniaturization
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Solution Overview
Problem
The increasing demand for data transmission in mobile communication devices necessitates smaller, multi-band filters to reduce device size while maintaining transmission rates, which traditional single-passband filters struggle to achieve.
Innovation Solution
A dual-mode surface acoustic wave device with a specific interdigital electrode thickness and material configuration, combined with a piezoelectric layer and substrate, to excite two acoustic wave modes, enhancing electromechanical coupling coefficients and supporting multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional single-passband filters are used to maintain transmission rates, then data transmission quality is ensured, but the number of filters must increase leading to larger device volume
Solution Approach 1:
The patent combines multiple passbands into a single filter device by utilizing dual acoustic wave modes (Rayleigh wave mode and Scholte wave mode). This merging approach allows one filter to perform the function of multiple traditional single-passband filters, thereby reducing the overall number of filters and device volume while maintaining the capability to handle multiple frequency bands for data transmission
Solution Approach 2:
The filter device achieves multi-functionality by supporting both Rayleigh wave and Scholte wave modes within a single device structure. This enables the filter to handle multiple frequency bands and perform signal separation across different bands simultaneously, making one filter replace multiple specialized filters while maintaining transmission quality across various frequency ranges
2Adaptability or versatility
If the number of filters is increased to support more frequency bands, then signal separation and selection functions are improved, but the device volume increases
Solution Approach 1:
Multiple frequency band handling capabilities are merged into a single filter device through the dual-mode architecture. The Rayleigh wave mode and Scholte wave mode operate simultaneously within one device, enabling support for multiple frequency bands without requiring separate filters for each band, thus improving adaptability while minimizing volume increase
Solution Approach 2:
The patent introduces a new dimension of operation by utilizing the Scholte wave mode in addition to the traditional Rayleigh wave mode. This dimensional expansion in the acoustic wave mode space allows the single filter to achieve multi-frequency band support that would traditionally require multiple separate filters, thereby improving versatility without proportionally increasing device volume
3Volume of stationary object
If miniaturization of filters is achieved to reduce device volume, then portability is improved, but maintaining transmission rate becomes more difficult
Solution Approach 1:
The miniaturized filter maintains transmission capability by merging multiple passband functions into a single compact device. The dual-mode architecture allows the small filter to handle multiple frequency bands simultaneously, ensuring that data transmission rate is not compromised despite the reduced size compared to traditional multi-filter configurations
Solution Approach 2:
The compact filter achieves universality by incorporating both Rayleigh wave and Scholte wave modes, enabling it to perform signal separation and selection across multiple frequency bands within a single small device. This multi-functional capability ensures that the miniaturized filter can maintain data transmission rates that would otherwise require larger, multiple-filter systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The dual-mode device supports broader frequency bands and miniaturization, with improved temperature stability and reduced energy loss, meeting the demands of 5G communication.
Implementation Method 1
a piezoelectric layer and an interdigital electrode which are successively stacked in a selected direction, wherein the thickness of the interdigital electrode is 10 nm-5 μm to excite a first-order horizontal shear wave mode
Data Source
AI summary
A dual-mode surface acoustic wave device and a preparation method thereof are provided. The dual-mode surface acoustic wave device includes a substrate, a piezoelectric layer and an interdigital electrode which are successively stacked in a selected direction. The thickness of the interdigital electrode is 10 nm-5 μm to excite a first-order horizontal shear wave mode, so that the dual-mode surface acoustic wave device has two acoustic wave modes, namely, a ground state horizontal shear wave and a first-order horizontal shear wave. The dual-mode surface acoustic wave device with two acoustic wave modes, namely, the ground state horizontal shear wave and the first-order horizontal shear wave can be prepared, so that the dual-mode surface acoustic wave device can support a filtering function in more frequency bands in 5G communication, and meets the development trend of miniaturization and broadband of surface acoustic wave filters.