Abstract

The aperture coupled microstrip antenna (ACMA) presents a good candidate for automotive radar application due to its compacity, light weight, low cost and the simplicity of its integration in antenna array. Typically, it consists of two substrates divided by a conductive ground plane in between. The patch is located on top of the upper substrate and the feedline is situated on the bottom substrate. Thereby, this antenna avoids parasitic line radiation which can, in some cases, disrupt side-lobe levels. This communication presents the design of a Multilayered Aperture Coupled Microstrip Antenna (MACMA) for 79 GHz automotive radar applications. This antenna presents in addition a Rohacell HF 51 foam sandwiched between the ground plane and the patch substrate layer. The multilayer substrate is used to minimize the coupling between patch antennas, in particular, surface waves which are not significantly excited on foam dielectric material thanks to the low synthetized permittivity. MACMPA model was done with High Frequency Structure Simulator (HFSS) software tool that could treat 3D full-wave electromagnetic structure analysis based on Finite Element Method.

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