Surface acoustic wave device

Abstract

The embodiments herein relate to surface acoustic wave (SAW) devices, such as filters and duplexers. The SAW device may have a high acoustic velocity layer and a piezoelectric layer coupled to the high acoustic velocity layer. At least one transducer is coupled at least to the piezoelectric layer, where the transducer propagates a surface acoustic wave having an operating wavelength along a surface of the piezoelectric layer. A metallic layer may be coupled to the surface of the piezoelectric layer and electrically isolated from the transducer.

Description

[0001] cross reference [0002] This application claims priority to US Patent Application No. 15 / 361,054, entitled "Surface Acoustic Wave Device," filed November 24, 2016, the entire contents of which are incorporated herein by reference. technical field [0003] Embodiments disclosed herein relate to surface acoustic wave (SAW) devices. In particular, embodiments relate to SAW filters, resonators and / or duplexers with improved electromechanical coupling and surface wave velocity. Background technique [0004] In communication systems (terminal and base station infrastructure), Surface Acoustic Wave (SAW) filters and resonators are widely used. For new standards such as E-UTRA used in 5G-TG4-CA, there is a growing demand for higher operating frequency, lower insertion loss, higher transmit power and / or wider channel bandwidth. It is expected that new piezoelectric materials or structures can meet the increasing demands for higher frequencies and wider channel bandwidths. ...

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Problems solved by technology

[0008] While these structures have been explored, they are insufficient to address specific challenges as described in this paper

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