# Improvement of SAW Resonator Performance by Petal-like Topological Insulator

## TL;DR

A new petal-like structure improves sound wave transmission in SAW resonators, leading to better performance and lower loss.

## Contribution

A novel petal-like topological insulator is introduced for enhanced SAW resonator performance.

## Key findings

- Adjusting structural parameters creates a broadband gap of 55.8–65.7 MHz.
- The structure achieves defect immunity and sharp bending in waveguide transmission.
- Insertion loss is reduced by 22 dB and quality factors are significantly improved.

## Abstract

This article introduces a novel petal-like SAW topology insulator, which can transmit sound waves with low loss and high flexibility in an ultra-wide frequency band by simultaneously adjusting multiple structural parameters of phononic crystals. Using finite element analysis, it was found that adjusting these parameters can generate a broadband gap of 55.8–65.7 MHz. This structure can also achieve defect immunity and sharp bending in waveguide transmission. When this topology insulator is applied to resonators, compared to traditional designs, the insertion loss is reduced by 22 dB, the on-load quality factor is increased by 227%, the off-load quality factor is increased by 1024.5%, and the quality sensitivity is improved by 3.7 times compared to bare devices.