  Electronic transport through a quantum dot strongly coupled to electrodes is
studied within a model with two conduction channels. It is shown that multiple
scattering and interference of transmitted waves through both channels lead to
Fano resonance associated with Kondo resonance. Interference effects are also
pronouncedly seen in transport through the Aharonov-Bohm ring with the Kondo
dot, where the current characteristics continuously evolve with the magnetic
flux.
