This paper present the characteristics of electromagnetic wave propagating in gyroelectric slab with an external magnetic field perpendicular to the interface between gyroelectric medium and a perfect conductor. First, using KDB coordinate system, we decomposed an electromagnetic wave in infinite gyroelectric medium into 2 types and got the dispersion relation respectively. Second, we discuss the reflection from the interface between gyroelectric medium and a perfect conductor for inclined incidence case. The conclusion that the reflected wave has the same ellipticity but the opposite rotate direction to the incident wave is proofed theoretically. Finally, the characteristics of metallic waveguide in Perpendicular Configuration have been discussed, and the guidance condition has been derived. And we found the main mode is zero mode, which is similar to the ordinary wave in infinite gyrotropic medium.
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