Reflector structure for improving out-of-band selectivity of surface acoustic wave filter

• Main Authors: DONG YUANDAN, AN JIANGUANG, AN HONGJIN, MA DONGHONG, XU XIAQIAN
• Format: Patent
• Language: Chinese; English
• Published: 14.05.2024
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

The invention discloses a reflector structure for improving out-of-band selectivity of a surface acoustic wave filter, which belongs to the technical field of surface acoustic wave filters and comprises two reflecting grating structures symmetrically arranged on two sides of an interdigital transducer. Each reflecting grating structure comprises a first reflecting grating, a second reflecting grating and at least one transition grating located between the first reflecting grating and the second reflecting grating. According to the surface acoustic wave filter, the reflector structures are arranged on the two sides of the interdigital transducer, so that the whole surface acoustic wave filter can obtain better passband insertion loss, out-of-band selectivity and suppression performance, the steepness of the surface acoustic wave filter can be improved while the product performance is not affected, and better out-of-band selectivity is provided. 本发明公开了一种改善声表面波滤波器带外选择性的反射器结构，属于声表面波滤波器技术领域，包括对称设置于叉指换能器两侧的两个反射栅结构，