WIDEBAND AND LOW SIDELOBE LINEAR SERIES FED YAGI-LIKE ANTENNA ARRAY

In this paper, a linear series fed Yagi-like antenna array is introduced leading to an end-flre fan beam with low sidelobe level, SLL, high front to back ratio, F/B, and wide impedance bandwidth. The array can provide ¡29dB SLL at centre frequency of 16.26GHz, ¡20dB SLL bandwidth of 7.5%, 23dB F/B and 10.6% impedance bandwidth. Further improvement in SLL can be achieved by extending narrow strips from the flnite ground plane of the antenna structure leading to some ¡32dB SLL at centre frequency and a ¡20dB SLL bandwidth of 8.7%. To verify the accuracy of the simulation results, both of the arrays are fabricated and tested. Finally, to show the applicability of the proposed design, the linear end-flre array of the above are stacked on top of each other and simulation results for a 2-D phased array are provided.