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We have developed a rear spoiler with built-in antenna. The spoiler has two features. First, the built-in antenna does not protrude from the vehicle contour and has an improved serviceability. Second, the air flow effect provides the driver with a clearer rear view, resulting in an improved safety. This paper discusses characteristics of the rear spoiler with built-in antenna.

Airflow effect is one of the important functions demanded of a rear spoiler. It helps prevent mud or dust from swirling up behind the running vehicle, or in the case of driving in the rain or snow, helps prevent rain or snow from adhering to the rear window. During the design process, we often decide on the shape of a spoiler in a relatively short time, focusing primarily on its appearance. Therefore, we established a design method using the recently developed computational fluid dynamics (CFD) to determine the central cross sectional shape of a spoiler that produces a desired airflow effect. We verified its effectiveness through testing.