Next generation Acoustic Wave Filter Platform

下一代声波滤波器平台

• 批准号: EP/W036827/1
• 负责人: Oliver Williams
• 金额: $ 62.62万
• 依托单位: CARDIFF UNIVERSITY
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FW036827%2F1
• 关键词: Next; generation; Acoustic; Wave; Filter

Acoustic wave devices exploit the higher speed of sound in solid materials than air by converting electrical energy into acoustic energy by piezoelectricity. Devices such as Surface Acoustic Wave (SAW) devices and Bulk Acoustic Wave (BAW) devices can filter high frequencies in the acoustic domain and form the backbone of mobile telephony base stations and radar.Unfortunately, piezoelectrics do not exhibit the highest acoustic wave velocities, and high velocity materials such as diamond do not exhibit piezoelectricity. This limits incumbent SAW technologies to around 2GHz. Piezoelectrics also have very limited thermal conductivity which means that operation at high powers is not possible.There is an increasing drive to create new materials combinations to realise higher frequency devices as evidenced by Murata's "Incredibly High Performance" (IHP) SAW filter which combines the piezoelectric LiTO3 and silicon. Diamond would be a natural extension of this technology with the highest of all acoustic wave velocities as well as the highest thermal conductivity of any electrical insulator. Unfortunately, the coupling between diamond and most piezoelectrics is relatively weak which leads to high insertion loss. This project aims to alleviate this issue with a Surface Activated Wafer Bond (SAWB), which also circumvents the high temperature and harsh environment of diamond growth which can significantly damage piezoelectric materials. By bonding at room temperature, it will be possible to combine high performance piezoelectric single crystals with diamond over large areas for unrivalled performance. The superlative acoustic wave velocity of diamond provides for high frequency operation whilst the thermal conductivity simultaneously unlocks high power operation currently unavailable to any other SAW platform (piezoelectrics are inherently of low thermal conductivity). This platform will have multiple applications from 5G base station transceivers to quantum memories.

声波设备通过压电性将电能转化为声能，从而利用固体材料中比空气更高的声波速度。声表面波(SAW)器件和体声波(BAW)器件可以在声学领域过滤高频，构成移动电话基站和雷达的主干。不幸的是，压电材料不表现出最高的声波速度，而高速材料如钻石也不表现出压电性。这将现有的SAW技术限制在2 GHz左右。压电体的导热系数也非常有限，这意味着不可能在高功率下工作。人们越来越希望创造新的材料组合来实现更高频率的器件，村田公司将压电LiTO_3和硅相结合的“难以置信的高性能”(IHP)声表面波滤波器就是明证。钻石将是这项技术的自然延伸，它拥有所有声波速度中最高的，以及任何电绝缘体中最高的导热系数。遗憾的是，金刚石与大多数压电体之间的耦合相对较弱，这导致了较高的插入损耗。该项目旨在通过表面激活晶片键合(SAWB)来缓解这一问题，它还可以绕过金刚石生长的高温和恶劣环境，因为高温和恶劣的环境可能会对压电材料造成严重损害。通过在室温下粘合，可以将高性能的压电单晶与大面积的钻石结合在一起，获得无与伦比的性能。钻石的最高声波速度提供了高频操作，同时热导同时释放了目前任何其他SAW平台都无法实现的高功率操作(压电体具有低导热性)。该平台将有从5G基站收发器到量子存储器的多种应用。