Protective helmet

A protective helmet comprising:

• an outer shell adapted to distribute impact forces;
• and
• an antenna located at least partially inside the outer shell and configured to transmit a radio signal;
• wherein the outer shell defines
• a main portion formed of a main material and
• a cut-out portion formed of a cut-out material,
• wherein the cut-out material defines a lower damping effect on a radio signal compared to the main material,
• wherein the outer shell defines a concave shape configured to partially enclose a head of a wearer of the protective helmet and defines a center point configured to substantially correspond with a center of the head of a wearer when worn, a point reflection about the center point of at least one portion of the cut-out portion defines a mirror region, at least part of which consists of the cut-out portion, and a mirror region radio path for said radio signal, starting from the antenna and extending through the mirror region, defines a lower damping than a main portion radio path for said radio signal extending through the main portion, and
• wherein the cut-out portion overlaps with the mirror region;
• and
• wherein the cut-out portion defines a first contiguous cut-out partial portion defining an extension portion and a second contiguous cut-out partial portion defining the mirror region, and the main portion separates the first contiguous cut-out partial portion from the second contiguous cut-out partial portion.

A method comprising:

• producing a protective helmet including an outer shell adapted to distribute impact forces and defining a main portion and a cut-out portion, said producing step including
• arranging in a molding device a main fiber material in the main portion of the outer shell for molding the outer shell;
• surrounding the main fiber material with a main matrix material;
• curing the main matrix material and, in turn, embedding the main fiber material therein and forming a main fiber composite;
• locating an antenna at least partially inside the outer shell that is configured to transmit a radio signal;
• and
• forming the cut-out portion of the outer shell adjacent to the main portion with a cut-out material including a secondary fiber composite including a secondary matrix material and a secondary fiber material;
• wherein the cut-out material defines a lower damping effect on a radio signal compared to the main fiber composite, the main matrix material corresponds to the secondary matrix material in its composition, and the secondary fiber material is different from the main fiber material,
• wherein the outer shell defines an extension portion and the antenna extends substantially completely along the extension portion, and
• wherein the extension portion is spaced from the main portion by at least 10 mm.