Design of Rayleigh SAW Resonators for Applications as Gas Sensors in Highly Reactive Chemical Environments

I. Avramov
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引用次数: 9

Abstract

This work presents the performance and important design considerations of the first successful highly efficient Rayleigh surface acoustic wave (RSAW) resonator filters using gold (Au) electrode structure. Au metallisation provides corrosion immunity when the devices are operated as polymer coated gas sensors in chemically reactive environments. It is shown that Au, due to its 7 times higher density than Al, provides about 13 times higher frequency sensitivity and a stronger velocity perturbation in resonant devices compared to their RSAW counterparts with aluminium (Al) electrodes. This results in strong excitation of unwanted surface skimming bulk wave (SSBW) modes and transverse wave guide modes (TWGMs) in such resonant Au devices. Practical guidelines for the choice of correct device geometry, Au thickness and spacer variations to maximize coupling to the desired RSAW mode, increase resonator efficiency and loaded Q, as well as minimize interference with parasitic TWGMs are given. Experimental 433 MHz two-port resonators and dual mode inline coupled filters with insertion loss in the -8 to -12 dB range and loaded Q values in the 4500 to 6000 range are presented with emphasis on their polymer coating and gas probing behavior
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在高反应化学环境中用作气体传感器的瑞利SAW谐振器的设计
本文介绍了第一个成功的使用金(Au)电极结构的高效瑞利表面声波(RSAW)谐振器滤波器的性能和重要的设计考虑。当设备在化学反应环境中作为聚合物涂层气体传感器操作时,金金属化提供抗腐蚀能力。结果表明,由于Au的密度比Al高7倍,因此在谐振器件中,与使用铝(Al)电极的RSAW相比,它提供了大约13倍的频率灵敏度和更强的速度扰动。这导致在这种谐振金器件中强烈激发不需要的表面掠掠体波(SSBW)模式和横波波导模式(TWGMs)。给出了选择正确的器件几何形状,Au厚度和间隔变化的实用指南,以最大限度地耦合到所需的RSAW模式,提高谐振器效率和负载Q,以及最大限度地减少寄生twgm的干扰。介绍了433 MHz双端口谐振器和双模在线耦合滤波器,其插入损耗在-8至-12 dB范围内,负载Q值在4500至6000范围内,重点介绍了它们的聚合物涂层和气体探测行为
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