Waveguide filter having coupling screws

A waveguide filter, comprising:

• a) a housing defining a passage through which waves can travel, the passage being absent any fixed protrusions;
• b) a plurality of adjustable projections extending through the housing into the passage, the plurality of adjustable projections comprising:
• i) a set of coupling projections, wherein each pair of adjacent coupling projections in the set of coupling projections defines therebetween a resonant cavity, and wherein each coupling projection in the set of coupling projections acts as a coupling element for at least one resonant cavity and is adjustable for trimming the coupling of that at least one resonant cavity;
• and
• ii) a set of tuning projections, wherein a tuning projection from the set of tuning projections is positioned between each pair of adjacent coupling projections and is adjustable for trimming a resonance frequency of an associated resonant cavity.

A method, comprising:

• a) placing a plurality of adjustable projections within pre-defined apertures of a waveguide filter housing, the housing defining a passage through which electromagnetic waves can travel, the passage being absent any fixed protrusions, wherein the plurality of adjustable projections comprises a set of coupling projections and a set of tuning projections, wherein the set of coupling projections are placed within alternating ones of the pre-defined apertures for defining therebetween resonant cavities, and wherein the set of tuning projections are placed within the remaining pre-defined apertures located between adjacent ones of the coupling projections;
• b) adjusting the positioning of at least some of the coupling projections of the set of coupling projections for trimming resonant cavity couplings of at least some of the resonant cavities;
• and
• c) adjusting the positioning of at least some of the tuning projections of the set of tuning projections for trimming a resonant frequency of at least some of the resonant cavities.