Optimum, multiple signal path, multiple-mode filters and method

Wave transmission lines and networks – Coupling networks – Wave filters including long line elements

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3332191, H01P 1208

Patent

active

055766749

ABSTRACT:
A preferred realization of a frequency spectrum filter incorporating multiple signal paths is selected using a new design tool, a plot of resonator coupling coefficient values representing filter designs having equivalent signal transfer characteristics. The design plot is formed by first subjecting an initial matrix of resonator coupling coefficients, representing a particular filter design, to pre-multiplications by selected plane rotation matrices--which each have their respective rotation angles--and to post-multiplications by their transposes. Equations for the individual elements that form the resulting modified coupling coefficient matrix are then plotted over a range of one of the rotation angles. Examination of the result plot leads to a selection of a set of coupling values in observance of predetermined criteria. An optimum realization of the filter is then constructed by adjusting the physical resonator couplings so that they conform to the coupling values selected from the plot. Some preferred realizations of dual-mode bandpass filters, which have been designed using this technique, are described.

REFERENCES:
patent: 4760361 (1988-07-01), Kobayashi
patent: 5083102 (1992-01-01), Zaki
Cameron et al. "Asymmetric Realizations for Dual-Mode Bandpass Filters," IEEE Transactions on Microwave Theory and Techniques, vol. MTT-29, No. 1, Jan. 1981, pp. 51-58.
Atia et al. "New Types of Waveguide Bandpass Filters for Satellite Transponders," COMSAT Technical Review, vol. 1, No. 1, Fall 1971, pp. 21-43.
Accatino et al. "Design and Realization of Multiple-Coupled Dual Mode Waveguide Filters," CSELT Rapporti Technici, vol. IX, No. 6, Dec. 1981, pp. 605-611.

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