Wideband Cavity Backed Spiral Antenna Design and Mutual Coupling Study in A Closely Spaced Array
This paper deals, first, with the design of a 6 to 18GHz Cavity Backed Archimedean Spiral Antenna (CB ASA) whose performance, in terms of VSWR, gain, and axial ratio, was improved by utilizing multiple absorbing materials. Then, by placing two spiral elements side by side, the mutual coupling effect was investigated in a two element CB ASA array, in which one element was excited while the other was passive with a matched load. The results show little effect on the performance of the active element due to the mutual coupling with the adjacent element, with less than 3dB axial ratio, less than 2 dB VSWR and consistent radiation pattern.
2018 18th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM)