Design charts by waveguide model and mode-matching techniques of microstrip line taper shapes for satellite broadcast planar antenna

The optimum shapes in which the reflected wave decreases at a specific frequency for a satellite broadcast reception were considered with the Klopfenstein (1956) and Hecken (1990) tapers. The tapered parts were divided like a flight of stairs. The scattering coefficients of each step were combined by using both the mode-matching and generalized scattering methods. The /spl lambda//4 transformer changes to the Klopfenstein taper shapes, and the exponential taper changes to the Hecken taper shapes, when a longer length is used in the wide passband frequency. By choosing the parameters adequately, it becomes possible to choose the appropriate proportioned necessary bandwidth. This paper shows that practical designs for optimum shapes were obtained using the Klopfenstein and Hecken tapers when the reflected wave decreases at a specific frequency for the satellite broadcast reception.