부산대학교 도서관

In this work, we present the material characterization of an Ajinomoto Build-Up Film® (ABF) material based on planar microstrip fork-coupled resonators as well as the development of wideband single element and 1×4 elements patch antenna array on this material at 79 GHz for automotive radar applications. Since large bandwidths are required for high resolution radar sensors, we applied a multi-resonance method using U-slot configurations inside the patch to increase the antenna bandwidth. To minimize the side-lobes in the array, the Tschebyscheff-filtering method was implemented to the individual array elements. Finally, the designed resonators and antennas were fabricated and measured. Only minor process deviations (< 8 μm) were observed. Appling our methodology for material characterization on the measurement results of the resonators, decent permittivity of 3.32 and loss tangent of 0.0047 were obtained at 78.26 GHz. The measured single element and 1×4 elements series-fed U-slot patch antennas developed on the extracted ABF material achieved wide impedance bandwidths of 8.1 GHz and 4.3 GHz covering the full specified bandwidth in the 79 GHz band and high peak gains of 7 dBi and 11.4 dBi, respectively. The results demonstrate that the proposed ABF material is also suitable for components development in automotive radar applications.