Theoretical and Experimental Analysis of Non-Uniform Microstrip Lines in the Frequency Range 2-18 GHz

In the field of microwave integrated devices, non-uniform microstrip lines have recently received considerable attention. Among these, with regard to band-width and losses, non-uniform microstrips with a continuously varying cross-section have better characteristics than those having only rough discontinuities. In this work a theoretical analysis of non-uniform microstrip lines, based on a magnetic walls model, is presented. The experiments performed in a wide freque, ncy range have shown a promising agreement with the theory. Both theoretical and experimental behaviour show the existence of transmission and reflection zeros characterizing the filtering properties of structures of this kind.