Synthesis of coplanar waveguide filters using inverse scattering approach

A novel analytical concept for the reconstruction of physical structures of a non uniform transmission line is presented here. The method is based on the solution of an inverse scattering problem, and involves the reconstruction of the impedance profile corresponding to the dimensions of the coplanar waveguide line in terms of its specified frequency response. The impedance profile is finally transformed into the geometry of the coplanar waveguide line using the standard relationships. In this paper, a novel approach is used to design cpw based filters using microwave inverse scattering. The proposed technique is shown to be applicable to continuously varying planar geometry taking into account the multiple reflection. The measured data are compared with the specified frequency response of the filter. The result of the developed filters are found to be within 2-3% of the specified frequency response.