A Novel Class of Digital Filters

In this paper, a novel class of digital filters are presented in the Z domain; the digital filters are obtained by interpolating the traditional Simpson´s- and trapezoidal-rule integrators. This formulation, in conjunction with the representations of transmission-line elements in the Z domain, leads to the transmission-line configuration that is eligible for a microwave integrator. We implement second-order integrators in the microstrip format that has an operating frequency up to 8.5GHz. The frequency responses of the second-order integrators were measured to validate this new formulation.