Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1984-05-08
1986-11-04
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333174, 333180, 333223, H01P 120, H03H 709, H03H 712
Patent
active
046212450
ABSTRACT:
A quadruple tuned 400 MHz IF filter comprises a rectangular substrate having a foil pattern of four inductors formed on one side thereof with four leadless capacitors and three lead type coupling capacitors interconnected between the inductors and the foil to form a filter. The inductors are arranged in a generally U-shaped configuration with the input inductor and output inductor being located at the legs of the U adjacent to each other for providing electromagnetic coupling between the input and output of the filter to sharpen the response of the filter along the skirts of the response curve. A triple tuned filter includes three helical resonators that are coupled by mutual stray capacitances. Output to input coupling is achieved with two wires connected to the input and output helical resonators and positioned adjacent to the middle helical resonator.
REFERENCES:
patent: 2751558 (1956-06-01), Grieg et al.
patent: 3763447 (1973-10-01), Takahashi et al.
patent: 4210884 (1980-07-01), Tabuchi et al.
patent: 4374370 (1983-02-01), Popovski et al.
patent: 4423396 (1983-12-01), Makimoto et al.
Hagele--"Mikrowellenfilter mit Umwegkopplungen zur Erzeugung von Dampfungspolen", Frequenz 24 (1970), 11; pp. 340-341.
Geffe--"Simplified Modern Filter Design", John F. Rider Publisher, Inc., New York, 1963; pp. 42-48.
Dobrovolny Pierre
Nicoletto Dominic J.
Nussbaum Marvin L.
Zenith Electronics Corporation
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