A high efficient automotive roof-antenna concept for LTE, DAB-L, GNSS and SDARS with low mutual coupling

A combination of a new antenna for Long Term Evolution (LTE) technology and Digital Audio Broadcasting in L-band (DAB-L) together with compact antennas for Global Navigation Satellite System (GNSS) and Satellite Digital Audio Radio Services (SDARS) is presented. The antenna module is designed to be placed on the roof of a car underneath a shark-fin-formed housing. The LTE/DAB-L antenna operates at frequency bands - from 698 MHz to 960 MHz and from 1427.9 MHz to 2700 MHz - covering available LTE frequencies. This antenna has a high efficiency due to panel design and obtains monopole characteristics in all LTE frequencies. In combination with GNSS and SDARS ring antennas the structure yields a sufficient decoupling to these antennas. This is even true for the SDARS antenna sharing the same phase center with the LTE-antenna. The satellite antennas achieve the required characteristics at their center frequencies of 1575 MHz and 2332 MHz.