In this study, we propose an improved parallel microring antenna array with increasingly wide rings, and we also study the switching and routing methods for the filter channels. Herein, we achieve flexible switching and routing of the filter channels of the parallel microrings. Further, the transmission characteristics of the parallel microring arrays with and without the proposed improvement are analyzed using the transfer matrix method. The routing method of the filter channel of the improved three-microring array is then numerically analyzed using MATLAB. The results denote that the filter channel is closed and the light with the corresponding wavelength cannot pass when two adjacent microrings satisfy the condition of destructive interference; however, when two adjacent microrings satisfy the condition of constructive interference, the filter channel is opened, and the light with the corresponding wavelength can pass. Finally, a 2×2 router is designed using four improved microring arrays.