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This paper presents a new class of pseudoelliptic function filters that are based on compact inline TM110-mode cavity configurations. No structural folding is required. The bypass couplings are implemented through the nonresonating TE1001/ modes so that arbitrarily positioned transmission zeros can be implemented. Design guidelines to generate a given transmission zero on the desired side of the passband and how to control it are presented. To demonstrate its flexibility, the approach is illustrated at examples of four-pole inline filters providing Chebyshev, elliptic-function-type, and asymmetric characteristics. Performance comparisons with different numerical codes validate the designs. A fourth-order pseudoelliptic filter with four transmission zeros is then designed, constructed, and measured. Excellent agreement between simulated and experimental results verifies the approach.
Microwave Theory and Techniques, IEEE Transactions on (Volume:51 , Issue: 6 )
Date of Publication: June 2003