Ultra-wideband circular-polarized radiation element with integrated feeding

A method for producing an antenna element having a layered configuration, the method comprising:

• providing a first ground plane, arranging a first dielectric layer to face the first ground plane, arranging a first planar radiation element to face the first dielectric layer, arranging a feeding via hole to electrically connect to the first planar radiation element and to extend through the first dielectric layer and through the first ground plane without electrical contact, and arranging at least one complementary set comprising a complementary dielectric layer and a complementary planar radiation element to face the complementary dielectric layer, wherein the set is arranged stackable facing the first planar radiation element such that a complementary dielectric layer is arranged between two radiation elements in the layered configuration, wherein the first planar radiation element constitutes a first continuous part of a spiral antenna and the at least one complementary planar radiation element constitutes a continuation of the spiral antenna, thereby the first and the at least one complementary planar radiation elements constitute an effective spiral antenna, and wherein a planar frame is arranged adjacent to the topmost complementary planar radiation element in the layered configuration, and is arranged to surround the effective spiral antenna, wherein the planar frame is electrically connected to the first ground plane with one or more grounding via holes extending through the first dielectric layer and the at least one complementary dielectric layer.