Dual-mode dielectric loaded cavity filter with nonadjacent mode

Details Dual-mode dielectric loaded cavity filter with nonadjacent mode Dual-mode dielectric loaded cavity filter with nonadjacent mode

1982-09-27

1984-06-05

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333227, 333230, H01P 1208, H01P 710, H01P 706

Patent

active

044531460

ABSTRACT:
An electromagnetic cavity filter (10) is formed by at least two cavities (12) having electrically conductive walls (40, 15). When more than two cavities (12) are employed, their midpoints do not have to be colinear; rather, it is sufficient that the angle formed by the midpoints of any three successively coupled cavities is an integral multiple of 90.degree.. Thus, a folded "engine block" geometry can be realized such that the filter's input cavity (12) is proximate to the output cavity (12). This allows a canonic filter response. Each cavity (12) is the equivalent to two filter poles because two orthogonal modes of electromagnetic radiation can resonate therewithin. Electrically nonadjacent modes of proximate cavities (12), as well as electrically adjacent modes, can be coupled, permitting elliptic filter functions. Electrically nonadjacent modes are coupled by means of an iris (30) opening between the two cavities (12). Electrically adjacent modes are coupled by means of an electrically conductive probe (22) penetrating each of the two cavities (12). A dielectric resonator (20) can be disposed within each cavity (12) to reduce the physical size of the cavity (12) while preserving its electrical characteristics.

REFERENCES:
patent: 3936775 (1976-02-01), Snyder
patent: 4167713 (1979-09-01), Pfitzenmaier
patent: 4180787 (1979-12-01), Pfitzenmaier
patent: 4396896 (1983-08-01), Williams

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