2results about How to "Lower Q value" patented technology

The present application relates to the technical field of resonator, and discloses a surface acoustic wave resonator and a surface acoustic wave filter, which comprise a piezoelectric layer, and an interdigital transducer and a reflective grating structure arranged on the piezoelectric layer and arranged along a first direction, the reflective grating structure being located at the side of the interdigital transducer; the reflective grating structure comprises a plurality of unit reflective gratings arranged along the first direction, and the finger strips of each unit reflective grating extend along a second direction; the structure of each unit reflective grating is an interdigital reflective grating, a short-circuit reflective grating or an open-circuit reflective grating; in the reflective grating structure, at least one unit reflective grating is an interdigital reflective grating, and the unit reflective gratings other than the interdigital reflective grating are one or both of a short-circuit reflective grating or an open-circuit reflective grating. The present application can weaken the influence of the longitudinal wave of the surface acoustic wave resonator on the filter passband, reduce the insertion loss, improve the flatness of the filter passband, and realize a surface acoustic wave device with high stability and low loss.

The invention discloses a multi-degree-of-freedom vibration reduction and load bearing scheme design method under a distributed spring, and relates to the field of vibration reduction design, the method comprises the steps that a distributed spring vibration isolator is designed, the distributed spring vibration isolator is composed of a platform, a load and eight vibration isolation assemblies, and each vibration isolation assembly comprises a vibration isolation base used for fixing the vibration isolation assemblies to the platform, the vibration-isolated base is used for being connected with a load, the spring plates are arranged on the vibration isolation base and the vibration-isolated base respectively, and the two ends of the compression spring are arranged on the spring plates to be fixed and supported. The eight vibration isolation assemblies are arranged in a hexahedron vertex uniform distribution mode, the intersection point of the axes of compression springs of all the vibration isolation assemblies passes through the geometric center of a hexahedron and is radially distributed in the space, an equivalent stiffness model of the distributed spring vibration isolator is established, and a kinetic equation of the distributed spring vibration isolator is obtained; and optimizing the size of each part of the distributed spring vibration isolator and the rigidity of a compression spring by utilizing a kinetic equation, and connecting the designed distributed spring vibration isolator with a load for use.