6. Conclusions

Since its inception, the volume-elastic wave filter industry has relied on accurate, reliable models to design filters with increasingly severe filter gauges, with a minimum number of iterations. While descriptive models are used in the early design phases, one-dimensional models dominate as they represent the physical behavior of components with reliability and fidelity. The increasing frequency of applications and the growing complexity of wireless transmission modules have made it additionally necessary to take account of temperature effects and the electromagnetic environment of these components in their design. The need to reduce filter losses has made it necessary to take account of acoustic radiation losses from resonators to their mechanical environment. Two or three-dimensional models are therefore now widely used, even if their consumption of computing resources means they are...