Three approaches for the realization of a Chebyshev cross-coupled UWB filter

This paper deals with the synthesis and realization of a UWB filter in the [3.168, 4.752] GHz band using a thin film IPD technology and a 4th order Chebyshev cross-coupled architecture that allows us to introduce two finite transmission zeroes out of band. In order to realize this filter, three approaches of realization were considered. The first approach was a classical use of the available technology, i.e. lumped elements. The second was the introduction of distributed capacitors to reduce the filter response sensitivity towards the industrial process variation. The last, dictated by size issues, consisted in using electromagnetic coupling in order to suppress a lumped inductor from the circuit. The three versions are described and results are discussed.