Capsule structure for preparing beverages, of the type of capsules into which a liquid is injected under pressure, comprising an external container of the capsule and a filter plate, which is set inside of said external container and fits into the geometry of said external container, wherein the external container comprises a holding chamber of an alimentary product below which the filter plate is located, wherein the external container comprises an internal wall and a bottom, wherein the filter plate comprises at least a filtering area that is open on the top, with a wall that is set upon the interior wall of the external container and a base that comprises a plurality of holes; characterized in that: - the filter plate comprises at least: ▪ an inner chamber, located immediately below the filtering area, into which the liquid mixed together with the alimentary product enters through the holes of the filtering area, wherein said inner chamber is delimited from below by a membrane, designed to break under the effect of pressure, when the pressure inside said inner chamber reaches a certain level; ▪ a lower area, the top section of which comprises a lip and a hollow geometry with an interior space, a side wall and an edge of said side wall, which is set upon the bottom of the external container; - the external container comprises, internally, on its bottom, several ridges and several teeth, the ridges being joined to the internal wall of the external container, and the teeth are located on the bottom of the external container, arranged concentrically with respect to the ridges; wherein: - the edge of the side wall of the lower area of the filter plate is inserted between said ridges and said teeth on the bottom of the external container, such that the filter plate fits tightly between said ridges and said teeth; - the base of the filtering area of the filter plate comprises a plurality of radial ridges, which run radially across the base of the filtering area, from the wall of the filtering area to the center of the filtering area, wherein the geometry of said radial ridges is like a dividing wall with an edge that protrudes above the base of the filtering area and an edge that protrudes below the base of the filtering area, such that said radial ridges penetrate into the inner chamber of the filter plate - the base of the filtering area of the filter plate is divided into two areas: • a central area, which comprises the holes; • a ring-shaped area, between the central area and the wall of the filtering area, located at a lower level than the central area of the base and through which the radial ridges run. - the filter plate comprises at least: ▪ an inner chamber, located immediately below the filtering area, into which the liquid mixed together with the alimentary product enters through the holes of the filtering area, wherein said inner chamber is delimited from below by a membrane, designed to break under the effect of pressure, when the pressure inside said inner chamber reaches a certain level; ▪ a lower area, the top section of which comprises a lip and a hollow geometry with an interior space, a side wall and an edge of said side wall, which is set upon the bottom of the external container; ▪ an inner chamber, located immediately below the filtering area, into which the liquid mixed together with the alimentary product enters through the holes of the filtering area, wherein said inner chamber is delimited from below by a membrane, designed to break under the effect of pressure, when the pressure inside said inner chamber reaches a certain level; ▪ a lower area, the top section of which comprises a lip and a hollow geometry with an interior space, a side wall and an edge of said side wall, which is set upon the bottom of the external container; - the external container comprises, internally, on its bottom, several ridges and several teeth, the ridges being joined to the internal wall of the external container, and the teeth are located on the bottom of the external container, arranged concentrically with respect to the ridges; - the edge of the side wall of the lower area of the filter plate is inserted between said ridges and said teeth on the bottom of the external container, such that the filter plate fits tightly between said ridges and said teeth; - the base of the filtering area of the filter plate comprises a plurality of radial ridges, which run radially across the base of the filtering area, from the wall of the filtering area to the center of the filtering area, wherein the geometry of said radial ridges is like a dividing wall with an edge that protrudes above the base of the filtering area and an edge that protrudes below the base of the filtering area, such that said radial ridges penetrate into the inner chamber of the filter plate - the base of the filtering area of the filter plate is divided into two areas: • a central area, which comprises the holes; • a ring-shaped area, between the central area and the wall of the filtering area, located at a lower level than the central area of the base and through which the radial ridges run. • a central area, which comprises the holes; • a ring-shaped area, between the central area and the wall of the filtering area, located at a lower level than the central area of the base and through which the radial ridges run.