Metallized dielectric waveguide filters having irregular shaped resonant cavities, slanted metallized openings and/or spurious coupling windows

A metallized dielectric waveguide filter, comprising:

• a first input/output port;
• a second input/output port;
• a dielectric block having a metallized top surface, a metallized bottom surface and a plurality of metallized outer sidewalls, the dielectric block further including a plurality of metallized openings that extend into the interior of the dielectric block, the metallized openings dividing the dielectric block into a plurality of resonator cavities,
• wherein a first of the metallized opening forms a first wall between a first of the resonator cavities and a second of the resonator cavities, the second resonator cavity being adjacent the first of the resonator cavities along a main transmission path through the dielectric block that extends between the first input/output port and the second input/output port sequentially through each of the resonator cavities, and a second of the metallized opening forms a second wall, and
• wherein the first wall and the second wall define a coupling window between the first of the resonator cavities and a third of the resonator cavities.

A metallized dielectric waveguide filter, comprising:

• a first input/output port;
• a second input/output port;
• a dielectric block having a metallized top surface, a metallized bottom surface and a plurality of metallized outer sidewalls, the dielectric block further including a plurality of metallized openings that extend into the interior of the dielectric block, the metallized openings dividing the dielectric block into a plurality of resonator cavities,
• wherein a main transmission path is defined through the dielectric block that extends between the first input/output port and the second input/output port sequentially through each of the resonator cavities, and
• wherein a first of the metallized openings extends substantially into a central region between a first of resonator cavities and a second of the resonator cavities that are adjacent each other along the main transmission path so as to define first and second coupling main windows between the first and second of the resonator cavities.

A metallized dielectric waveguide filter, comprising:

• a first input/output port;
• a second input/output port;
• a dielectric block having a metallized top surface, a metallized bottom surface and a plurality of metallized outer sidewalls, the dielectric block further including a plurality of metallized openings that extend into the interior of the dielectric block, the metallized openings forming metallized inner walls within the dielectric block,
• wherein the metallized outer walls and the metallized inner walls define a plurality of main coupling windows that form a main transmission path through the dielectric block that extends between the first input/output port and the second input/output port sequentially through each of the resonator cavities, a first cross-coupling window between two of the resonant cavities that are not adjacent each other along the main transmission path, and a first spurious coupling window,
• wherein the first spurious coupling window is configured to generate a cross-coupling between first and second of the resonant cavities that are not adjacent each other along the main transmission path that substantially cancels coupling between the first and second of the resonant cavities that occurs along the main transmission path.