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Design of quasi-millimeter wave leaf-shaped bowtie array antenna for UWB applications

Ultra-wideband (UWB) radio technology has recently attracted considerable attention for various applications, such as short-range high-speed communication, sensor networks, radar and location tracking. In 2002, the Federal Communications Commission (FCC) announced its decision to allow the unlicensed use of the frequency band from 3.1 to 10.6 GHz for UWB communication systems [1]. The FCC also allocated the quasi-millimeter wave band of 22 to 29GHz for radar applications. As a practical use of UWB radar systems, short-range (SR) automotive radar operating in the quasi-millimeter wave band has been receiving increased interest in recent years.