Ultra wideband surface acoustic wave resonator and filter

• Main Authors: TAN FAZENG, JIANG XIN, PENG XIAO, LI YAN
• Format: Patent
• Language: Chinese; English
• Published: 20.03.2018
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

The invention discloses an ultra wideband surface acoustic wave resonator, comprising a 15-degree lithium niobate substrate, wherein metal finger strips are set on the substrate according to a comb shape. A value range of a ratio of width d of the metal finger strips and a half resonant period p of the ultra wideband surface acoustic wave resonator is 0.28-0.38. The value range of the ratio of thickness h of the metal finger strips and a resonant period 2p of the ultra wideband surface acoustic wave resonator is 0.08-0.11. According to the ultra wideband surface acoustic wave resonator, through optimization of a duty cycle of the resonator and the relative thickness of coating, transverse mode and Rayleigh wave parasitism can be effectively suppressed according to a technical method of plating copper on a 15-degree lithium niobate material, so passband ripples are limited within a 1dB range; and a miniature ultra wideband surface acoustic wave filter which has relative bandwidth of 20%and can be applied to en