2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/95289We propose a simple scheme for the spin filter by studying the coherent transport of electrons through a double-bend structure in a quantum wire with a weak lateral magnetic potential which is much weaker than the Fermi energy of the leads. {\em Extremely large} spin polarized current in the order of {\em micro-Ampere} can be obtained because of the strong resonant behavior from the double bends. Further study suggests the roubustness of this spin filter.3 pages, 3 figures in eps formatMesoscale and Nanoscale Physicstext