The Design of Microwave Bandpass Filters Using Resonators With Nonuniform$ Q$

With the exception of predistortion, most design methods for microwave filters are based on lossless prototype networks, with the effects of loss generally being considered afterwards, by analysis rather than synthesis. This paper presents new techniques, which either utilize existing losses, or add losses, to improve the performance of microwave bandpass filters. Unlike predistortion, these new techniques result in networks with nonuniform dissipation. Experimental prototype filters have been designed and the measured results demonstrate improved performance compared with that previously reported