Dual band antenna, in particular for satellite navigation applications

摘要

The invention relates to a dual band antenna, in particular for satellite navigation applications, comprising a multilayer structure that is provided with an upper first antenna element (12) for receiving electromagnetic waves having a frequency in a first frequency band, a lower second antenna element (16) arranged below the first antenna element (12) for receiving electromagnetic waves having a frequency in a second frequency band, two electrically conductive ground layers (20,28), a first and a second one, that are arranged one above the other and that are arranged in turn below the lower second antenna element (16), and a conducting-path layer (24) having at least one first conductive path (30,32) for electromagnetically coupling with the first antenna element (12) and having at least one second conductive path (34,36) for electromagnetically coupling with the second antenna element (16). The first ground layer (20) facing the lower second antenna element (16) comprises an aperture (40,42), below which the at least one second conductive path (34,36) extends. The at least one first conductive path (30,32) is connected to the upper first antenna element (12) by means of an electrical conductor (46,48) that extends through the first ground layer (20) and the lower second antenna element (16) in such a way that the electrical conductor is electrically insulated from the first ground layer and the lower second antenna element. Furthermore, the multilayer structure is provided with a first line adjustment element (58,60,62,64) coupled with the at least one first conductive path (30,32) for suppressing the coupling into the first conductive path (30,32) of electromagnetic waves having a frequency in the second frequency band which are received by means of the lower second antenna element (16) and coupled into the electrical conductor (46,48), a second line adjustment element (44) coupled with the at least one second conductive path (34,36) for suppressing the coupling into the second conductive path (34,36) of electromagnetic waves in the first frequency band which are received by means of the upper first antenna element (12), and several dielectric layers (14,18,22,26) that are arranged betweeen the antenna elements(12,16), ground layers (20,28), and conducting-path layer(24) that lie one above the other.