# US 2022/0285809 A1 · Dielectric waveguide resonator and dielectric waveguide filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0285809 A1 - Document ID: US20220285809A1 - Status: Published application - Kind: A1 - Application number: 17/825,022 - Filed: 2022-05-26 - Published: 2022-09-08 - Earliest claimed: 2019-12-09 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Masayuki KIKUDA - Web page: https://patentgrep.com/patent/US20220285809A1 ## CPC - H01P 1/2053: {the coaxial cavity resonators being disposed parall to each other} - H01P 1/2088: {Integrated in a substrate} - H01P 1/2084: {with dielectric resonators} - H01P 3/12: Hollow waveguides (H01P3/20 takes precedence) - H01P 7/10: Dielectric resonators - H01P 7/082: {Microstripline resonators (H01P7/088 takes precedence)} - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) ## Abstract A dielectric waveguide filter includes a dielectric plate including first and second principal surfaces facing each other and a side surface connecting outer edges of the first and second principal surfaces, a first surface conductor at the first principal surface, a second surface conductor at the second principal surface, a side conductor film inside the dielectric plate and connecting the first and second surface conductors, and an internal conductor extending in a perpendicular direction to the first principal surface and electrically connected to neither the first surface conductor nor the second surface conductor. Dielectric waveguide resonant spaces are surrounded by the first surface conductor, the second surface conductor, and the side conductor film. ## Claims ### Claim 1 A dielectric waveguide resonator comprising: a dielectric plate including a first principal surface and a second principal surface facing each other and a side surface connecting an outer edge of the first principal surface and an outer edge of the second principal surface; a first surface conductor at the first principal surface; a second surface conductor at the second principal surface; a connection conductor inside the dielectric plate and connecting the first surface conductor and the second surface conductor; and an internal conductor which extends in a perpendicular direction to the first principal surface and is electrically connected to neither the first surface conductor nor the second surface conductor; wherein the dielectric waveguide resonator includes a dielectric waveguide resonant space surrounded by the first surface conductor, the second surface conductor, and the connection conductor. ### Claim 2 (depends on 1) The dielectric waveguide resonator according to claim 1, wherein the dielectric plate is a multilayer body including a plurality of dielectric layers, and the internal conductor is a conductor defining an inner layer of the plurality of dielectric layers. ### Claim 3 (depends on 1) The dielectric waveguide resonator according to claim 1, wherein the connection conductor is a conductor film at the side surface of the dielectric plate or a through via conductor which extends through the dielectric plate. ### Claim 4 (depends on 1) The dielectric waveguide resonator according to claim 1, wherein a space is provided inside the dielectric plate, and the internal conductor is a conductor that fills the space or a conductor on an inner surface of the space. ### Claim 5 (depends on 1) The dielectric waveguide resonator according to claim 1, wherein the internal conductor is a columnar or tubular conductor. ### Claim 6 (depends on 1) The dielectric waveguide resonator according to claim 1, wherein the internal conductor includes at least one of a planar conductor which faces the first surface conductor in parallel and a planar conductor which faces the second surface conductor in parallel. ### Claim 7 (depends on 1) The dielectric waveguide resonator according to claim 1, wherein the internal conductor is located in a middle of the dielectric waveguide resonant space in plan view of the first surface conductor. ### Claim 8 (depends on 1) The dielectric waveguide resonator according to claim 1, wherein a permittivity of a dielectric present in at least one of a region between the first surface conductor and the internal conductor and a region between the second surface conductor and the internal conductor is higher than a permittivity of a dielectric present in a different region. ### Claim 9 (depends on 1) The dielectric waveguide resonator according to claim 1, wherein a main resonant mode in the dielectric waveguide resonant space is a TE mode in which an electric field faces a direction between the first surface conductor and the second surface conductor. ### Claim 10 (depends on 1) The dielectric waveguide resonator according to claim 1, wherein a ratio of a first distance between the internal conductor and the first surface conductor to a second distance between the internal conductor and the second surface conductor is about 0.1 to about 1.0 inclusive. ### Claim 11 A dielectric waveguide filter comprising: a dielectric waveguide resonator including: a dielectric plate including a first principal surface and a second principal surface facing each other and a side surface connecting an outer edge of the first principal surface and an outer edge of the second principal surface; a first surface conductor at the first principal surface; a second surface conductor at the second principal surface; and a connection conductor inside the dielectric plate and connecting the first surface conductor and the second surface conductor; wherein the dielectric waveguide filter includes an internal conductor inside the dielectric waveguide resonator, extends in a perpendicular direction to the first principal surface, and is electrically connected to neither the first surface conductor nor the second surface conductor. ### Claim 12 A dielectric waveguide filter comprising: a plurality of dielectric waveguide resonators each including: a dielectric plate including a first principal surface and a second principal surface facing each other and a side surface connecting an outer edge of the first principal surface and an outer edge of the second principal surface; a first surface conductor at the first principal surface; a second surface conductor at the second principal surface; and a connection conductor inside the dielectric plate and connecting the first surface conductor and the second surface conductor; and a main coupling portion coupling adjacent dielectric waveguide resonators of the plurality of dielectric waveguide resonators; wherein each of one, some, or all of the plurality of dielectric waveguide resonators includes an internal conductor inside the dielectric waveguide resonator, extends in a perpendicular direction to the first principal surface, and is electrically connected to neither the first surface conductor nor the second surface conductor. ### Claim 13 (depends on 12) The dielectric waveguide filter according to claim 12, wherein the main coupling portion includes a plurality of main coupling portions including an inductive coupling portion and a capacitive coupling portion and includes a portion where the inductive coupling portion and the capacitive coupling portion are alternately and repeatedly arranged along a main signal propagation route. ### Claim 14 (depends on 13) The dielectric waveguide filter according to claim 13, wherein of the plurality of main coupling portions, a main coupling portion between a dielectric waveguide resonator which inputs and outputs a signal from and to an outside and a dielectric waveguide resonator which is coupled to the dielectric waveguide resonator is an inductive coupling portion. ### Claim 15 (depends on 13) The dielectric waveguide filter according to claim 13, wherein the plurality of dielectric waveguide resonators are arranged along a sub coupling portion besides the main coupling portion for signal propagation; and the dielectric waveguide filter further includes a sub coupling portion between dielectric waveguide resonators adjacent along the sub coupling portion. ### Claim 16 (depends on 15) The dielectric waveguide filter according to claim 15, wherein the dielectric waveguide filter includes a first group of dielectric waveguide resonators including three or more dielectric waveguide resonators and a second group of dielectric waveguide resonators including three or more dielectric waveguide resonators, and the main coupling portion is provided between a dielectric waveguide resonator at a last stage in the first group and a dielectric waveguide resonator at a first stage in the second group; a dielectric waveguide resonator at a first stage of the first group and a dielectric waveguide resonator at a last stage of the second group are dielectric waveguide resonators defining I/O portions; the sub coupling portion is provided between a dielectric waveguide resonator which is two stages ahead of the last stage in the first group and a dielectric waveguide resonator which is two stages behind the first stage of the second group, and the sub coupling portion is an inductive sub coupling portion; the dielectric waveguide filter includes the internal conductor for a trap resonator between a dielectric waveguide resonator which is one stage ahead of the last stage of the first group and a dielectric waveguide resonator which is one stage behind the first stage of the second group; and a distance between the internal conductor of the dielectric waveguide resonator at the last stage of the first group and the internal conductor of the dielectric waveguide resonator at the first stage of the second group is narrower than a distance between the internal conductor of the dielectric waveguide resonator one stage ahead of the last stage of the first group and the internal conductor of the dielectric waveguide resonator one stage behind the first stage of the second group. ### Claim 17 (depends on 15) The dielectric waveguide filter according to claim 15, wherein the dielectric waveguide filter includes a first group and a second group, each including three or more dielectric waveguide resonators, and the main coupling portion is provided between a dielectric waveguide resonator at a last stage in the first group and a dielectric waveguide resonator at a first stage in the second group; a dielectric waveguide resonator at a first stage of the first group and a dielectric waveguide resonator at a last stage of the second group are dielectric waveguide resonators defining I/O portions; the dielectric waveguide filter includes the internal conductor for a trap resonator at a position surrounded by the internal conductor of the dielectric waveguide resonator at the last stage of the first group, the internal conductor of the dielectric waveguide resonator at the first stage of the second group, the internal conductor of a dielectric waveguide resonator which is one stage ahead of the last stage of the first group, and the internal conductor of a dielectric waveguide resonator which is one stage ahead of the last stage of the first group; and a distance between the internal conductor of the dielectric waveguide resonator at the last stage of the first group and the internal conductor of the dielectric waveguide resonator at the first stage of the second group is narrower than a distance between the internal conductor of the dielectric waveguide resonator one stage ahead of the last stage of the first group and the internal conductor of the dielectric waveguide resonator one stage behind the first stage of the second group. ### Claim 18 (depends on 16) The dielectric waveguide filter according to claim 16, wherein a distance between the internal conductor of the dielectric waveguide resonator at the last stage of the first group and the internal conductor for the trap resonator is equal to a distance between the internal conductor of the dielectric waveguide resonator at the first stage of the second group and the internal conductor for the trap resonator.