The extreme beamsquint technique to minimize the reflection coefficient of very small aperture radial line slot array antennas

Abstract

This paper proposes the utilization of extreme beamsquint technique to minimize the reflection coefficient of very small aperture radial line slot array (VSA-RLSA) antennas when the normal beamsquint technique is no longer able to do so. This technique utilizes very high beamsquint in order to obtain multiple rings on the radiating element of VSA-RLSA antennas, thus minimizes the reflection coefficient and improves the efficiency of VSA-RLSA antennas. The theoretical analysis on the generation procedure of signal reflections in the VSA-RLSA antennas, as well as the operational function of how extreme beamsquint technique can minimize the signal reflections, is explained. Various extreme beamsquint VSA-RLSA antennas and normal beamsquint VSA-RLSA antennas with radius of 75 mm are designed, simulated and fabricated. The good agreement between simulation and measurement results shows that the extreme beamsquint VSA-RLSA antennas have much lower reflection coefficient response and higher efficiency than the normal beamsquint VSA-RLSA antennas.