Dual mode filters

Details Dual mode filters Dual mode filters

1985-09-24

1987-03-24

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333208, 333209, 333230, 333231, H01P 1208, H01P 504, H01P 706

Patent

active

046528440

ABSTRACT:
A dual mode filter has a hollow cylindrical longitudinal outer body which is divided by transversely extending disk-like separation walls into a plurality of internal cavities. At least one coupling opening in each separation wall permits coupling of energy from one cavity to another. Said coupling opening being preferably an arcuate opening, in each separation wall, which extends along a constant radius at the outer periphery of the separation wall and over a limited angular span. When the openings are two, they are spaced 180.degree. apart, i.e. opposite one another. Adjacent separation walls are rotatably displaced 90.degree. with respect to each other so that their respective coupling opening(s) is (are) misaligned by 90.degree.. One respective adjustment screw is provided for each separation wall which penetrates through a hole in the outer body into one of the coupling openings in the given separation wall. Since the coupling openings are located almost against the outer body of the filter, the stroke or range of travel of the screw into the cavity is extremely limited.

REFERENCES:
patent: 4028651 (1977-06-01), Leetmaa
patent: 4251787 (1981-02-01), Young et al.

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