A new printed antenna system mounted in an aperture in the roof of a car is evaluated for broadcast signal reception from 88-108 MHz. Results from simulations on the vehicle are compared with measurements. The overall performance of the antenna is also compared to common types of vehicle antennas, the roof monopole and a glass based antenna. Overall the average gain of the antennas was better than 3 dBi for vertical polarization and 10 dBi for horizontal while the input return loss was generally better than 2 dB before matching sections in the tuners and comparable with common automotive antennas. The antennas in the roof aperture offer an alternative place to mount antennas on automobiles.

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Abstract:The modelling of an automotive antenna printed on a glass window is described.Simulations are compared with measurements to verify the model at 100 MHz.Simulations include the entire external car body generated from mechanical CAD data and transformed into an appropriate electromagnetic model. The feed position,

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