Soluch Waldemar
Institute of Electronic Materials Technology, Wolczynska 133, Warsaw, Poland.
IEEE Trans Ultrason Ferroelectr Freq Control. 2007 Feb;54(2):413-7. doi: 10.1109/tuffc.2007.255.
In a surface transverse wave (STW) asynchronous resonator, grating phase shifters are placed between interdigital transducers and reflectors to obtain the incident and reflected waves in phase, and the resonance frequency is located near the center frequency of the reflectors. In this paper, the scattering matrix method is used for design of such resonators with one dominant longitudinal mode. At a frequency of about 509.5 MHz, insertion loss, and loaded and unloaded quality factors of about 6 dB, 5,300 and 11,000, respectively, were obtained. The measured and calculated parameters of this resonator are in good agreement. Design guidelines and comparison of synchronous and asynchronous resonators are presented. Compared to synchronous resonators, low spurious signals' level, location of the resonance frequency near the center frequency of the reflectors, and simple design method make the asynchronous resonators more attractive for manufacture and practical applications.
在表面横波（STW）异步谐振器中，光栅移相器置于叉指换能器和反射器之间，以使入射波和反射波同相，且谐振频率位于反射器的中心频率附近。本文采用散射矩阵法设计这种具有一个主导纵向模式的谐振器。在约509.5 MHz的频率下，分别获得了约6 dB的插入损耗、约5300的加载品质因数和约11000的空载品质因数。该谐振器的测量参数与计算参数吻合良好。文中给出了设计指南以及同步谐振器和异步谐振器的比较。与同步谐振器相比，低杂散信号电平、谐振频率位于反射器中心频率附近以及简单的设计方法使得异步谐振器在制造和实际应用中更具吸引力。
