Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1995-07-12
1998-06-02
Lee, Benny T.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333219, 333230, H01P 1208, H01P 706
Patent
active
057606676
ABSTRACT:
A bandpass filter having 4-degrees of freedom includes a plurality of resonant cavities having respective Qs where at least one of the Qs is different. A plurality of main couplings couple successive resonant cavities to establish a main signal path that provides a first degree of freedom for controlling the shape of the filter's frequency response over its passband. A plurality of bridge couplings couple pairs of the resonant cavities so that the cavities are connected in a canonical circuit topology. The bridge couplings provide second and third degrees of freedom for controlling the sharpness of the frequency response 's transition between its passband and stopband and controlling the linearity of its phase, respectively. The cavities' non-uniform Qs provide a fourth degree of freedom for controlling the amplitude of the filter's frequency response in the passband so that the amplitude is within a predetermined tolerance of a desired passband shape.
REFERENCES:
patent: 4060779 (1977-11-01), Atia et al.
patent: 4241323 (1980-12-01), Griffin et al.
patent: 5254963 (1993-10-01), Bonetti et al.
Williams et al., "Dual-Mode Canonical Waveguide Filters," IEEE Transactions on Microwave Theory and Techniques, vol. MTT-25, No. 12, Dec. 1977, pp. 1021-1026.
Temes et al. Modern Filter Theory and Design, John Wiley & Sons, 1973, pp. 84-91 no month.
Bennett Richard L.
Loi Keith N.
Young Frederick A.
Bettendorf Justin P.
Denson-Low Wanda K.
Gudmestad Terje
Hughes Aircraft Co.
Lee Benny T.
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