Invisible antenna embedded in the roof of a car with high efficiency for reception of Satellite Digital Audio Radio Services (SDARS)

For mobile reception of Satellite Digital Audio Radio Services (SDARS) in North America an invisible antenna is presented which is embedded in the roof of a car. Although the antenna is completely lowered in a metal cavity and covered by a thick dielectric part of the roof so that the surface profile of the car is not changed, the antenna shows a high efficiency and a large bandwidth in comparison to conventional SDARS receiving antennas as for example patch antennas. The antenna offers a small mounting volume and shows a radiation pattern which is tailored to the reception of SDARS signals transmitted via highly-elliptical-orbit satellites, geostationary earth orbit satellites and terrestrial repeaters. Simulation results, measurement results and field measurements show the high performance of this antenna.