Bandpass filter for UHF band

Details Bandpass filter for UHF band Bandpass filter for UHF band

1981-09-29

1983-12-27

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333168, 333219, 333246, H03H 701, H01P 1203, H01P 708

Patent

active

044233965

ABSTRACT:
In a bandpass filter having five or more resonator stages, a sub transmission line is coupled to the main transmission line at the first and fourth resonators. The first to fourth resonators provide peak attenuation points at both sides of the center frequency in the attenuation curve, while the remaining resonators following the fourth resonator further sharpen the attenuation characteristics of the bandpass filter. The main and sub transmission lines may be formed by striplines on a printed circuit board, while the sub transmission line can be capacity coupled to the main transmission line. Coupling capacitances are freely set by setting the length of each gap between adjacent striplines to a desired value. Thus, the peak attenuation points can be accurately controlled to provide a bandpass filter having superior characteristics.

REFERENCES:
patent: 2749523 (1956-06-01), Dishal
patent: 4167713 (1979-09-01), Pfitzenmaier
patent: 4180787 (1979-12-01), Pfitzenmaier

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