Design of a Planar Wideband Yagi-Uda Antenna for Millimeter Wave SAR Imaging Application

In this paper, a wideband planar Yagi-Uda antenna was designed for millimeter wave synthetic aperture radar (SAR) imaging application. A series of simulations were performed to investigate the effect of each part of the antenna on its radiation characteristics. The designed antenna can achieve ~16% (~55 - 65 GHz) bandwidth (S
₁₁
<; -10 dB), ~7 dB gain, and ~85
^o
and 90
^o
half-power beam-width (HPBW) in the E- and H-planes, respectively. Subsequently, the antenna was manufactured and tested, showing close agreement between its simulated and measured characteristics. Finally, the imaging performance of the designed antenna was examined through several SAR imaging experiments.