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We investigate the electron transport in a quasi-one-dimensional constriction with an attractive, finite-size impurity, in the ballistic limit theoretically. Within the envelope function approximation we formulate the scattering matrix exactly that determines the resonance structure of the electron transmission. Due to the multiple impurity levels under the many-channel conditions, multiple Breit-Wigner resonances and Fano line shapes appear in the same energy window. By varying the size of thedoi:10.1103/physrevb.60.10962 fatcat:tboffjuinrblnfdckwxow54p2e