Theory of Direct-Coupled-Cavity Filters Export

@article{Levy:1967, abstract = {A new theory is presented for the design of direct-coupled-cavity filters in transmission line or waveguide. It is shown that for a specified range of parameters the insertion-loss characteristic of these filters in the case of Chebyshev equal-ripple characteristic is given very accurately by the formula P₀ / /P_L = 1+h²T_n²[\ω₀ / \ω sin(\π \ω / \ω₀) / sin\θ₀'] where h defines the ripple level, T_n is the first-kind Chebyshev polynomial of degree n, \ω / \ω₀ is normalized frequency, and \θ₀' is an angle proportional to the bandwidth of a distributed lowpass prototype filter. The element values of the direct-coupled filter are related directly to the step impedances of the prototype whose values have been tabulated. The theory gives close agreement with computed data over a range of parameters as specified by a very simple formula. The design technique is convenient for practical applications.}, author = {Levy, R.}, booktitle = {Microwave Theory and Techniques, IEEE Transactions on}, citeulike-article-id = {3879465}, citeulike-linkout-0 = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1126471}, journal = {Microwave Theory and Techniques, IEEE Transactions on}, keywords = {cavity-fitlers, filter, filter-synthesis}, number = {6}, pages = {340--348}, posted-at = {2009-01-12 23:15:11}, priority = {2}, title = {Theory of Direct-Coupled-Cavity Filters}, url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1126471}, volume = {15}, year = {1967} }

TY - JOUR ID - Levy:1967 L3 - citeulike-article-id:3879465 N2 - A new theory is presented for the design of direct-coupled-cavity filters in transmission line or waveguide. It is shown that for a specified range of parameters the insertion-loss characteristic of these filters in the case of Chebyshev equal-ripple characteristic is given very accurately by the formula P₀ / /P_L = 1+h²T_n²[ω₀ / ω sin(π ω / ω₀) / sinθ₀'] where h defines the ripple level, T_n is the first-kind Chebyshev polynomial of degree n, ω / ω₀ is normalized frequency, and θ₀' is an angle proportional to the bandwidth of a distributed lowpass prototype filter. The element values of the direct-coupled filter are related directly to the step impedances of the prototype whose values have been tabulated. The theory gives close agreement with computed data over a range of parameters as specified by a very simple formula. The design technique is convenient for practical applications. IS - 6 JF - Microwave Theory and Techniques, IEEE Transactions on EP - 348 TI - Theory of Direct-Coupled-Cavity Filters VL - 15 T2 - Microwave Theory and Techniques, IEEE Transactions on SP - 340 KW - cavity-fitlers KW - filter KW - filter-synthesis AU - Levy, R PY - 1967/// UR - http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1126471 ER -