On the Design of Selected Microwave Circuits with Non-Uniform Transmission Lines.

In this paper, a practical approach to the design of selected microwave circuits with Non-Uniform Transmission Lines (NUTLs) is presented. Influence of NUTL shape and dielectric constant of a substrate on the frequency response of a line is investigated and described. To prove the NUTL’s usefulness, a branch-line coupler (BLC) with 3rd harmonic suppression and broadband output matching network of a power amplifier is designed and compared with their conventional counterparts, composed of only uniform transmission lines.