<p>Materials with high dielectric constants and low dielectric losses are essential for electronic and electromechanical devices. However, achieving a balance between dielectric constant and dielectric loss remains a significant challenge. Thermoplastic polyurethane (TPU) was used as the polymer matrix and polyamide 11 (PA11) as the filler to prepare TPU/PA11 composites through melt blending. The optimal content of PA11 in the TPU matrix was 20 wt.% (sample P₈). PA11 was uniformly dispersed within the TPU, with slight agglomeration being observed. With the incorporation of 20 wt.% PA11, the dielectric constant of the TPU/PA11 composite increased by 37.84%, while the dielectric loss decreased by 49.10%. These enhancements were attributed to the polar groups in PA11, which enhanced the material's polarization capability, thereby increasing the dielectric constant. Simultaneously, the flexible chain segments of TPU enhanced molecular chain mobility, leading to a reduction in dielectric loss. Notably, the dielectric loss at a frequency of 2 × 10³&#xa0;Hz was as low as 0.017. These results suggest that the TPU/PA11 composite holds significant promise for electronic device applications, where it can effectively improve signal transmission efficiency and electric field energy storage performance.</p>