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Quantum transport in disordered magnetic fields is investigated numericallyin two-dimensional systems. In particular, the case where the mean and thefluctuation of disordered magnetic fields are of the same order is considered.It is found that in the limit of weak disorder the conductivity exhibits aqualitatively different behavior from that in the conventional random magneticfields with zero mean. The conductivity is estimated by the equation of motionmethod and by the two-terminal Landauer formula. It is demonstrated that theconductance stays on the order of $e^2/h$ even in the weak disorder limit. Thepresent behavior can be interpreted in terms of the Drude formula. TheShubnikov-de Haas oscillation is also observed in the weak disorder regime.Comment: 6 pages, 7 figures, to appear in Phys. Rev.

Quantum transport properties of two-dimensional systems in disordered magnetic fields with a fixed sign