US 11,742,557 B2
Dielectric waveguide filter
Masayuki Kikuda, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Apr. 20, 2022, as Appl. No. 17/724,762.
Application 17/724,762 is a continuation of application No. PCT/JP2020/039853, filed on Oct. 23, 2020.
Claims priority of application No. 2019-222125 (JP), filed on Dec. 9, 2019.
Prior Publication US 2022/0247056 A1, Aug. 4, 2022
Int. Cl. H01P 1/20 (2006.01)
CPC H01P 1/2002 (2013.01) 26 Claims
OG exemplary drawing
 
1. A dielectric waveguide filter comprising:
a plurality of dielectric waveguide resonators each of which includes a dielectric plate including a first main surface, a second main surface, and a side surface, the first main surface and the second main surface opposing each other, and the side surface connecting an outer edge of the first main surface and an outer edge of the second main surface to each other, a first surface conductor in or on the first main surface, a second surface conductor in or on the second main surface, and a connection conductor in the dielectric plate and connecting the first surface conductor and the second surface conductor to each other;
a main coupling portion between dielectric waveguide resonators that are adjacent to each other along a main path of signal propagation; and
an auxiliary coupling portion between dielectric waveguide resonators adjacent to each other along an auxiliary path of signal propagation; wherein
some or all of the plurality of dielectric waveguide resonators each include an inner conductor extending in a direction perpendicular to the first main surface;
the plurality of dielectric waveguide resonators include a first set of dielectric waveguide resonators including three or more dielectric waveguide resonators, a second set of dielectric waveguide resonators including three or more dielectric waveguide resonators, and a dielectric waveguide resonator for a trap resonator that includes the inner conductor;
the main coupling portion is between the dielectric waveguide resonator in a final stage of the first set and the dielectric waveguide resonator in an initial stage of the second set;
the dielectric waveguide resonator for a trap resonator is between the dielectric waveguide resonator that is one stage before the dielectric waveguide resonator in the final stage of the first set and the dielectric waveguide resonator that is one stage after the dielectric waveguide resonator in the initial stage of the second set; and
the dielectric waveguide resonator for a trap resonator is a dielectric waveguide resonator that is coupled to the dielectric waveguide resonator in the final stage of the first set and the dielectric waveguide resonator in the initial stage of the second set.