CST – Computer Simulation Technology

Modelling Automotive Antennas
Lester Low, Richard Langley
Antennas and Propagation Society International Symposium, 2004. IEEE
Volume: 3, June 2004
3171- 3174
There are a large number of antennas hidden from view on many of today’s automobiles. Different antennas cover radio and television reception, telephone and navigation systems and increasingly digital radio reception. Hidden antennas invariably suffer from performance problems due to shielding from the vehicle and simple diversity systems have become common for broadcast reception. The window glass areas on cars are popular places for printing radio and television antennas [1-3] and more recently a cut out in the roof incorporating a glass sunroof panel or plastic panel has been used. In this paper we have investigated and compared the performance of antennas placed in these regions. The inclusion of seats and other interior trim panels is studied. The study involved computer predictions using both CST Microwave Studio and FEKO software and was validated where possible by measurements. The FEKO package combines the Method of Moments with the Uniform Theory of Diffraction while CST Microwave Studio is based on the Finite Integration Method. Each package was able to import 3D data of the car body and mesh it electromagnetically to compute the antenna performance. In addition each package can handle dielectrics within the structure. This ability to input complex body shapes is vital for this type of simulation. For this study sports utility vehicles were used. Work concentrated on the FM radio frequency band which presents the most demanding problems.

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