| 基于LiTaO3基片宽带声表面波滤波器设计方法 |
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| 引用本文： | 张华,齐梦珂,潘虹芝,李孟辉,程一民,牟笑静,陈建军,曹亮. 基于LiTaO3基片宽带声表面波滤波器设计方法[J]. 压电与声光, 2022, 44(5): 726-730 |
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| 作者姓名： | 张华 齐梦珂 潘虹芝 李孟辉 程一民 牟笑静 陈建军 曹亮 |
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| 作者单位： | 中国电子科技集团公司第二十六研究所,重庆 400060;重庆大学 新型微纳器件与系统技术国防重点学科实验室,重庆 400044 |
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| 基金项目： | 国家重点研发计划基金资助项目(No．2019YFB2004800，No．2019YFB2004803)；国家自然科学基金资助项目(No．52075061)；中央高校基础研究基金资助项目(No．2019CDCGGD320)；重庆大学光电工程学院项目研究生科研和创新基金会资助项目(GDYKC202004) |
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| 摘 要： | 通讯系统传输效率的提升对滤波器带宽的要求越来越高，如果使用常规声表面波(SAW)滤波器设计技术，则将面临损耗大或带宽达不到要求的问题。该文根据系列宽带SAW滤波器产品开发结果，总结了采用特殊技术用LiTaO3压电基片实现相对带宽8%以上的宽带SAW滤波器设计方法，其包括利用外围电感、电容增加SAW谐振器的谐振频率和反谐振频率的间隔，提高阻抗元滤波器带宽；利用多模式纵向耦合谐振滤波器结构增加滤波器带宽；利用双通带滤波器并联结构获得大带宽滤波器。上述方法各有优缺点，其均能获得约为9%的带宽。
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| 关 键 词： | 钽酸锂 声表面波 大带宽 滤波器 |
Design Method of Wide Bandwidth SAW Filter Based on LiTaO3 |
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| Zhang Hu,Qi Mengke,Pan Hongzhi,Li Menghui,Cheng Yimin,Mou Xiaojing,Chen Jianjun,Cao Liang. Design Method of Wide Bandwidth SAW Filter Based on LiTaO3[J]. Piezoelectrics & Acoustooptics, 2022, 44(5): 726-730 |
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| Authors: | Zhang Hu Qi Mengke Pan Hongzhi Li Menghui Cheng Yimin Mou Xiaojing Chen Jianjun Cao Liang |
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| Affiliation: | The 2 6.th Institute of China Electronic Technology Group Corporation, Chongqing 400060 , China;National Defense Key Discipline Laboratory of New Micro-Nano Devices and Systems Technology, Chongqing University, Chongqing 400044 , China |
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| Abstract: | With the increase of the transmission efficiency of the communication system, the bandwidth of the filter is required to be wider and wider. If the conventional SAW filter design technology is used, it will face the problem of high loss or insufficient bandwidth. Based on the development of a series of wideband SAW filters, this paper summarizes the design methods of wideband SAW filters with a relative bandwidth of more than 8% by using LiTaO3 piezoelectric substrate with special technology. These methods include using peripheral inductance and capacitance to increase the difference between the resonant frequency and the anti-resonant frequency of the SAW resonator to improve the bandwidth of the impedance element filter, using multi-mode longitudinal couple resonance structure to increase filter bandwidth, and using dual-pass filter parallel structure to obtain large-bandwidth filter. Each of the described methods has advantages and disadvantages, and the achievable bandwidth is about 9%. |
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