MIC-fed L-shaped vertical strip line primary radiator for planar antennas at 60 GHz

In this paper, this primary radiator was improved from the viewpoint of the radiation pattern. The primary radiator consists of the vertical strip transmission line on which an L-shaped array pattern is etched. It was fed by a microstrip line installed in an L-shaped metal mount through a coaxial cable embedded in the sidewall of the L-shaped metal mount. This sidewall acts as a reflection plate for the backward wave from the primary radiator and a unidirectional radiation pattern was performed. And moreover, the radiation pattern versus a width of the sidewall was calculated to examine a compactness of the primary radiator. Based on the calculated radiation patterns of the radiator and related characteristics, a planar antenna was fabricated and the performance was evaluated at 59.5 GHz.