Insertion loss of a balanced transmission line crossing rectangular apertures in dual infinite backplanes

This paper presents the backplane effects for a balanced transmission line crossing two rectangular apertures in dual infinite ground backplanes. The FDTD method is used to determine the characteristics of the backplane insertion losses of the transmission line between the first backplane and the second backplane as the line length increases. The results show that the insertion gain is obtained from the half wavelength intervals for the total transmission line length. The backplane insertion loss and gain values vary depending on the length increase between dual conducting screens. As the length of the line increase both the insertion gain and loss at specific frequency ranges. The measurement of the insertion loss is performed to verify the theoretical analysis.