High-frequency band-pass filter having multiple resonators for p

Details High-frequency band-pass filter having multiple resonators for p High-frequency band-pass filter having multiple resonators for p

1991-02-22

1992-08-04

Laroche, Eugene R.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333205, H01P 1203

Patent

active

051362694

ABSTRACT:
A high-frequency band-pass filter has an input resonator, a middle resonator and an output resonator which are coupled in parallel. The input resonator and the output resonator are capacitively shortened quarter-wave line resonators. To improve the attenuation characteristics, the middle resonator is designed as a capacitively shortened half-wave resonator. The input resonator extends along a first part of the length of the middle resonator. The output resonator extends along a second part of the length of the middle resonator.

REFERENCES:
patent: 4578656 (1986-03-01), Lacour et al.
patent: 4992759 (1991-02-01), Giraudeau et al.
patent: 5021757 (1991-06-01), Kobayashi et al.
Rizzoli et al, "Vector Processing concepts in microwave circuit design", h European Microwave Conf. Sep. 13, 1984, pp. 847-852.
Lotkova, "The Design of Microstrip filters employing coupled lines", 1298 Telecommunication & Radio Engin. Apr. 4, 1987, pp. 70-72.
Fechner, "Microstrip Elliptic Function Bandpass filters", 2213 Frequenz, vol. 34, No. 5, Mar., 1980, pp. 78-89.
Rhodes, "Suspended Substrate Filters and Multiplexers", 16th European Microwave Conf. Sep. 12, 1986, pp. 8-18.
Matthaei, "Comb-line Band-pass filters of Narrow or Moderate Bandwidth", The microwave journal, Aug. 1963, pp. 82-91.

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