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5.9_GHz_Longitudinal_Leaky_SAW_Filter_With_FBW_of_9.2_and_IL_of_1.8_dB_Using_LN_Quartz_Structure.pdf
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The article titled *"5.9 GHz Longitudinal Leaky SAW Filter With FBW of 9.2% and IL of 1.8 dB Using LN/Quartz Structure"* presents the development of a high-frequency surface acoustic wave (SAW) filter optimized for 5G and sub-6G systems. Here’s a summary:
### Key Points:
1. **Objective**: The goal is to improve the performance of SAW filters by achieving higher frequencies and wider bandwidths, which are essential for 5G communication systems. The device uses a longitudinal leaky surface acoustic wave (LLSAW) filter structure based on a combination of lithium niobate (LN) and quartz.
2. **Design and Structure**:
- The LLSAW filter is designed using a 128° Y-90° X LN film bonded to a 160° Y-90° X quartz substrate.
- This structure was chosen to reduce spurious resonances and improve the performance of the SAW filter in higher frequency ranges, overcoming issues with energy leakage and ripples seen in other substrates like silicon (Si), silicon carbide (SiC), or diamond.
- The design optimized the LN cut, quartz cut, and LN film thickness, allowing the device to achieve a phase velocity of 6194 m/s and an effective electromechanical coupling coefficient (K²eff) of 12.0%.
3. **Performance**:
- The fabricated filter operates at 5.924 GHz with a fractional bandwidth (FBW) of 9.2% and an insertion loss (IL) of just 1.82 dB.
- The filter achieves spurious-free resonance, making it highly suitable for applications in 5G systems where clean signal transmission is crucial.
- The temperature coefficient of frequency (TCF) is measured at -82.84 ppm/°C, indicating good thermal stability.
4. **Comparison**:
- The LLSAW filter demonstrated superior performance compared to other high-frequency SAW filters, with larger bandwidth and lower insertion loss. The LN/quartz structure provided cleaner spectra compared to LN/SiC or LN/diamond alternatives, which often suffer from spurious modes and ripples.
5. **Conclusion**:
- This work is the first to experimentally implement a high-frequency and wideband LLSAW filter using an LN/quartz structure. The results show promising applications for 5G systems, with further improvements possible through structural optimization.
This research highlights the potential of LN/quartz-based LLSAW filters to meet the demands of modern communication systems, offering high performance in terms of bandwidth, low loss, and clean signal propagation.
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