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Definition of "resonant cavity" |
cavity with reflecting surfaces or mirrors that can support low-loss oscillations. By closing a metallic waveguide by two metallic surfaces perpendicular to its axis, a cylindrical cavity is formed. Resonant modes in this cavity are designated by adding a third subscript so as to indicate the number of half-waves along the axis of the cavity. When the cavity is a rectangular parallelepiped, the axis of the cylinder from which the cavity is assumed to be made should be designated, since there are three possible cylinders out of which the parallelepiped may be made. More generally, each closed cavity may sustain a discrete infinity of resonant field distributions. |
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