Integrated microwave filter and method of constructing same

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

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333209, 333230, H01P 1208, H01P 1161

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045715637

ABSTRACT:
Cascaded dual-mode resonance cavities are separated by plates having each a cruciform iris therein, the arms of which have lengths determined by a direct and precise procedure starting from a conventional Butterworth prototype filter. The transfer function parameters are altered to change the filter response and the group delay performance is determined and compared to an ideal flat response for producing a penalty function signal from the difference in order to modify the parameters again in such direction that the penalty function signal is likely to be reduced. The process is repeated until the penalty function signal is minimum, whereby a compact structure is realized which provides an attenuation response having sharp cut-off slopes at the edges of the signal bandwidth together with a close to flat in-band group delay response.

REFERENCES:
patent: 3697898 (1972-10-01), Blachier et al.
patent: 4135133 (1979-01-01), Mok
J. D. Rhodes, "A Low-Pass Prototype Network for Microwave Linear Phase Filters," IEEE MTT, vol. 18, pp. 290-301, Jun. 1970.
A. E. Atia & A. E. Williams, "New Types of Waveguide Bandpass Filters for Satellite Transponders," Comsat Tech. Rev., vol. 1, No. 1, 1971.
R. J. Cameron, "Computer Aided Design of Advanced Microwave Filters," Spacecad '79, Proc. Int. Symposium, Nov., 1979.
G. Pfitzenmaier, "An Exact Solution for a Six-Cavity Dual-Mode Elliptic Bandpass Filter," Proc. 1977 Int. Microwave Symp., pp. 400-403.
Seymour B. Cohn, "Determination of Aperture Parameters by Electrolytic-Tank Measurements," Proc. of the IRE, 1416-1421, Nov. 1951.
Seymour B. Cohn, "The Electric Polarizability of Apertures of Arbitrary Shape," Proc. of the IRE, 1069-1071, Sep. 5, 1952.
Cameron et al.-"The Analysis, Synthesis and Multiplexion of Bandpass Dual-Mode Filters", ESA Journal (1977), vol. 1, No. 2; pp. 177-188.
Williams et al.-"Dual-Mode Canonical Waveguide Filters" IEEE Trans. on Microwave Theory and Techniques, vol. MTT-25, No. 12, Dec. 1977; pp. 1021-1026.

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