Design and application of quasi-elliptic bandstop filters

In this paper, the design and implementation of a new type of band-stop filter having transmission zeros is presented. Detailed design aspects of 3 and 4 pole band-stop quasi-elliptic filters are discussed, where transmission zeroes are attained by a source-load cross coupling line. These filter topologies offers a sharp pass-band to stop-band transition due to the introduction of the pair of transmission zeros, compared to a conventional Chebyshev design.