With the rapid development of 5G technology, surface acoustic wave filters (SAWF) face significant challenges in bandwidth (BW) and spurious suppression. This work explores the methods applicable to solve spurious issues while ensuring wide BW through the optimization of electrode materials, thickness, and the direction of Interdigital Trans-ducer (IDT) propagation. The results show that Au-IDT outperforms Cu-IDT in reducing spuriousness. Experimental results confirm that Au electrodes achieve a spurious-free passband. Furthermore, the work reveals that adjusting the propagation angle to 90° relative to the X-axis results in the spurious-free SAW with high velocity, enabling the de-sign of a spurious-free filter with a 331 MHz BW and a 3.02 GHz frequency, even when Cu-IDT is used. These find-ings provide valuable insights into high-frequency, wideband, spurious-free filter design for next-generation wireless communications.