US 5,608,363 AGranted

Folded single mode dielectric resonator filter with cross couplings between non-sequential adjacent resonators and cross diagonal couplings between non-sequential contiguous resonators

AssigneeCom Dev Ltd.

InventorsRichard J. Cameron, Wai-Cheung Tang, Van Dokas

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Abstract

The invention relates to a single mode multi-cavity microwave filter that includes a housing formed with a plurality of walls which define at least two rows of side-by-side dielectric loaded cavities, wherein sequential cavities are coupled to one another via slots formed in the walls therebetween and at least one pair of non-sequential adjacent cavities are coupled via a probe. The coupling via the slots is defined mathematically as positive coupling. The probe is selectively configurable to provide positive or negative coupling relative to the sign of the slot coupling. Further, at least one non-adjacent, non-sequential pair of cavities is coupled via a second probe that may be configured to provide either positive or negative coupling relative to the sign of the slot coupling. The filter housing supports a plurality of adjustable fins which extend into the slots, one fin to each slot, to selectively adjust the size of the slot.

Claims12

Dependent claims

A single mode microwave filter comprising:

a unitary multi-cavity housing comprised of a plurality of walls defining a plurality of cavities, that are sequentially oriented in first and second side-by-side rows, each row having a plurality of cavities;
a plurality of cylindrically shaped dielectric resonators, a respective dielectric resonator disposed in each of said cavities, the walls between adjacent sequential cavities being provided with coupling means for coupling adjacent sequential resonators;
an input device disposed adjacent to and connected to a first cavity in said first row;
an output device disposed adjacent to and connected to a cavity in said second row;
a first probe disposed in the wall between two adjacent non-sequential cavities, one cavity of said two adjacent non-sequential cavities being in said first row and the other cavity of said two adjacent non-sequential cavities being in said second row thus cross coupling said two adjacent cavities, said first probe having opposite first probe ends, said first probe ends extending into respectively said two adjacent non-sequential cavities to couple radiant energy therebetween;
a second probe disposed in said walls, said second probe having second probe ends that extend into respectively two contiguous non-adjacent non-sequential cavities to couple radiant energy therebetween.

3 more elements

Dependencies are inferred from the claim text.