Revista: IEEE Transactions on Microwave Theory and Techniques. Vol 54. Pp. 3751-3764. October 2006.

Autores: Roberto Gómez-García and José I. Alonso

A systematic consistent and analytical method for the exact synthesis of ultra-wideband bandpass filtering responses
using the isolated cascade connection of high- and low-pass sections is presented in this paper. Through the described synthesis technique, the optimum values for the design parameters of the high- and low-pass sections are computed from the initial specifications of the intended bandpass filtering profile. The theoretical results are validated with a synthesis example for both the Butterworth and Chebyshev cases. Furthermore, to prove the practical viability of the ultra-wideband filter topology based on high- and low-pass sections, a prototype at 4 GHz is designed, constructed in
hybrid technology, and characterized. The main advantages of this wideband microwave bandpass fillter solution are also highlighted.