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Coplanar 122-GHz Antenna Array With Air Cavity Reflector for Integration in Plastic Packages

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4 Author(s)
Beer, S. ; Inst. fuer Hochfrequenztech. und Elektron. (IHE), Karlsruhe Inst. of Technol. (KIT), Karlsruhe, Germany ; Gulan, Heiko ; Rusch, C. ; Zwick, T.

This letter introduces the concept of a surface-mountable millimeter-wave radar sensor, which becomes possible by integrating the complete radar front end including the antennas into a single plastic package. The packaging concept is based on a matched coplanar wire-bond interconnect between the semiconductor die and the off-chip antenna. A 122-GHz antenna design is presented that uses an air cavity within the center die pad to improve the bandwidth-efficiency product. The antenna is designed in an array configuration to reduce the effect of surface waves. Measurements of the antenna prototype in the package, as well as a study on the influence of the package lid on the antenna performance, are given.

Published in:

Antennas and Wireless Propagation Letters, IEEE  (Volume:11 )