Center-fed traveling-wave microstrip array antenna using elliptically-shaped radiating elements in quasi millimeter-wave band

A center-feeding travelling-wave microstrip array antenna is designed to realize a high-gain and broadband two-dimensional array antenna in quasi millimeter-wave band. Microstrip antennas suffer from high feeding-loss in high frequency band. Therefore, center-feeding and travelling-wave operation are applied. To reduce manufacturing errors in etching process, we propose elliptically shaped radiating elements directly connected to the feeding line. The simulated performance of the designed two-dimensional microstrip planar array with 45-degree polarization in quasi millimeter-wave band is evaluated in this paper.