A filter arrangement having three or more stacked metallization layers separated by printed circuit board, PCB, layers. Each metallization layer includes an aperture. The filter arrangement has a plurality of via-holes extending though the stacked metallization layers and through the separating Dielectric material layers, whereby the via-holes and the metallization layers delimit a cavity in each Dielectric material layer. The cavities in two consecutive Dielectric material layers being coupled by the aperture in the single metallization layer separating the two consecutive Dielectric material layers. The aperture of a topmost metallization layer being arranged as antenna element. The filter arrangement having a signal interface arranged as a conduit connecting at least one dielectric material layer to an exterior of the filter arrangement.

A method of fabricating and tuning a surface integrated waveguide (SIW) filter incudes covering upper and lower surfaces of a dielectric substrate with a metallic layer. The method includes drilling a plurality of vias on the dielectric substrate and covering the vias with the metallic layer, wherein a first group of vias forms one or more cavity resonators, a second group of vias defines coupling channels between the cavity resonators, a third group of vias defines an effective width and a fourth group of vias defines an effective length of the cavity resonators. The method includes varying a center frequency by increasing diameters of the second group of vias to decrease the width of the coupling channels and varying a roll-off by increasing diameters of the third and fourth groups of vias to decrease the effective width and the effective length of the resonators.

A RF dielectric filter comprising a block of dielectric material including top and bottom exterior longitudinal surfaces and side exterior surfaces covered with a layer of conductive material. RF signal input/output pads are located at opposed ends of the block. Each of the RF signal input/output pads comprises a strip of conductive material bridging between the bottom exterior surface and the side exterior surface. A strip or region of dielectric material surrounds all the sides of the elongate strip of conductive material except for one end of the strip of conductive material on the side exterior surface which is in a direct unitary coupling relationship with the remainder of the conductive material on the side exterior surface. In one embodiment, the strip or region of dielectric material is generally U-shaped and can vary in width.

A filter includes a waveguide formed in a dielectric surrounded by a conductor wall. The conductor wall includes at least one control wall protruding toward an inner side of the waveguide. The at least one control wall includes an end portion in a protruding direction of the at least one control wall and a central portion in the protruding direction. The end portion includes a wall portion of which wall thickness is different from the central portion.

A dielectric waveguide filter includes at least four dielectric waveguide resonators arranged along a main coupling path for signal propagation, and main coupling portions each of which is provided between the dielectric waveguide resonators that are adjacent to each other along the main coupling path among the at least four dielectric waveguide resonators. The main coupling portions include an inductive coupling portion and a capacitive coupling portion, and the inductive coupling portion and the capacitive coupling portion are alternately and repeatedly arranged along the main coupling path.

A microwave or radio frequency (RF) device includes a substrate and a cover. The substrate has a first surface and an opposing second surface, the first surface including a first RF component and a second RF component electrically coupled to the first RF component in series. The cover is disposed over the first surface of the substrate, where the cover includes a first portion with a first width covering the first RF component, where the first portion and the first surface define a first waveguide cavity having the first width, and a second portion with a second width, less than the first width, covering the second RF component, where the second portion and the first surface define a second waveguide cavity having the second width.

A transmission line in which a waveguide tube and a planar transmission path are coupled to a post-wall waveguide broadens a band in which return loss is small. A transmission line (1) includes: a PPW (filter 11) including wide walls (13, 14) and narrow walls (16); and a waveguide tube (21). The PPW (filter 11) includes a columnar conductor (pin 18) that passes through an opening (13a) which is provided in the wide wall (conductor layer 13) and that has one end portion (181) located inside the substrate (12). The waveguide tube (21) is placed such that the columnar conductor (pin 18) passes through an opening (22a) and such that another end portion (182) of the columnar conductor (pin 18) is located inside the waveguide tube (21).

A dielectric waveguide filter includes resonators in a dielectric plate. A main coupling portion is between a final stage resonator of a first set and an initial stage resonator of a second set. A trap resonator is between a resonator that is one stage before the final stage resonator of the first set and a resonator that is one stage after the initial stage resonator of the second set, and the trap resonator is coupled to the final stage resonator of the first set and the initial stage resonator of the second set.

A filter that makes it easy to adjust a center frequency of a passband is implemented. The filter (1) includes a post-wall waveguide (11) functioning as a plurality of resonators (11a to 11e) that are electromagnetically coupled to each other and cavities (12a to 12e) stacked on the post-wall waveguide (11). The cavities (12a to 12e) are electromagnetically coupled with resonators (11a to 11e) via coupling windows (112a to 112e) formed in a broad wall (first broad wall (112)) of the post-wall waveguide (11).

The present invention provides a filter antenna including a first resonant cavity and a second resonant cavity which are stacked from top to bottom and in coupling communication with each other, an antenna unit provided on a side of the first resonant cavity facing away from the second resonant cavity, and a feed structure provided in the second resonant cavity. The present invention integrates a filter with an antenna to ensure the performance of the filter antenna by using a SIW cavity filter, thereby effectively suppressing interference from out-of-band spurious signals. In addition, the stacking structure of the antenna and the filter effectively reduces a volume to achieve miniaturization, and the antenna structure is optimized in a compact environment.