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We investigate the electron transport in multiply connected metallic carbonnanotubes within the Landauer-B\"{u}ttiker formalism. Quasibound states coupledto the incident $\pi^{*}$ states give rise to energy levels of different widthsdepending on the coupling strength. In particular, donorlike states originatingfrom heptagonal rings are found to give a very narrow level. Interferencebetween broad and narrow levels produces Fano-type resonant backscattering aswell as resonant tunneling. Over a significantly wide energy range, almostperfect suppression of the conduction of $\pi^{*}$ electrons occurs, which maybe regarded as filtering of particular electrons ($\pi$-pass filter)

Fano resonance and orbital filtering in multiply connected carbon nanotubes