# US 8,570,212 B2 · Waveguide converter, antenna and radar device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,212 B2 - Document ID: US8570212B2 - Status: Granted - Kind: B2 - Application number: 13/082,134 - Filed: 2011-04-07 - Published: 2012-03-08 - Granted: 2013-10-29 - Earliest claimed: 2010-04-09 - Assignees: Furuno Electric Co., Ltd. - Applicants: Koji Yano - Inventors: Koji Yano - Web page: https://patentgrep.com/patent/US8570212B2 ## CPC - H01P 1/064: {the axis of rotation being perpendicular to the transmission path, e.g. hinge joint} - H01P 5/024: {between hollow waveguides} - H01Q 1/42: Housings not intimately mechanically associated with radiating elements, e.g. radome - H01Q 13/0225: {of non-circular cross-section (H01Q13/0216 takes precedence)} - H01Q 21/0037: {linear waveguide fed arrays} - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract This disclosure provides a waveguide converter, which includes a first waveguide for propagating an electromagnetic wave, a second waveguide for being inputted the electromagnetic wave from the first waveguide and propagating the electromagnetic wave in a direction different from the propagating direction of the electromagnetic wave in the first waveguide, and an elongated-plate-shaped inner conductor arranged between the first waveguide and the second waveguide so that end portions of the inner conductor are exposed to the inside of the first waveguide and the second waveguide, respectively. ## Claims ### Claim 1 A waveguide converter, comprising: a first waveguide configured to propagate an electromagnetic wave in a first direction; a second waveguide configured to receive, as an input, the electromagnetic wave from the first waveguide and configured to propagate the input electromagnetic wave in a second direction different from the first direction; an elongated-plate-shaped inner conductor arranged between the first waveguide and the second waveguide such that end portions of the inner conductor are exposed to an inside of the first waveguide and an inside of the second waveguide; and an insulator, including a cylindrical portion that fits onto at least a part of the second section, configured to electrically insulate the inner conductor from inside walls of the first waveguide and inside walls of the second waveguide; the inner conductor having a first section of a first width, the first section being exposed to the inside of the first waveguide, a second section of a second width, the second section being exposed to the inside of the second waveguide, and a convex portion in a part of the first section, and the first width being wider than the second width. ### Claim 2 (depends on 1) The waveguide converter of claim 1, wherein the first waveguide and the second waveguide have central axes that do not intersect. ### Claim 3 (depends on 1) The waveguide converter of claim 1, wherein the first waveguide has a rectangular cross section, and a width of a first side face of the first waveguide that faces the second waveguide and a width of another first side face of the first waveguide that opposes the first side face are narrower than widths of second side faces that are perpendicular to the first side faces. ### Claim 4 A waveguide converter, comprising: a first waveguide configured to propagate an electromagnetic wave in a first direction; a second waveguide configured to receive, as an input, the electromagnetic wave from the first waveguide and configured to propagate the input electromagnetic wave in a second direction different from the first direction; an elongated-plate-shaped inner conductor arranged between the first waveguide and the second waveguide such that end portions of the inner conductor are exposed to an inside of the first waveguide and an inside of the second waveguide; and an insulator configured to electrically insulate the inner conductor from inside walls of the first waveguide and inside walls of the second waveguide; the inner conductor having a first section of a first width, the first section being exposed to the inside of the first waveguide, a second section of a second width, the second section being exposed to the inside of the second waveguide, and a convex portion in a part of the first section, the convex portion having a third width in a tip end portion of the first section, the first width being wider than the second width, and the third width being narrower than the first width. ### Claim 5 (depends on 4) The waveguide converter of claim 4, wherein the second section and the convex portion have substantially the same width. ### Claim 6 (depends on 5) The waveguide converter of claim 5, wherein the inner conductor has a to-be-supported section that extends from at least one of the first section and the convex portion by a predetermined length in a direction perpendicular to the elongating axis of the inner conductor. ### Claim 7 (depends on 6) The waveguide converter of claim 6, wherein the first waveguide has a supporting portion for supporting the to-be-supported section, the supporting portion being provided to a side face of the first waveguide. ### Claim 8 (depends on 1) The waveguide converter of claim 1, wherein the first waveguide and the second waveguide are arranged on the opposite side from an emitting surface of an antenna; and the antenna further comprising a radome for accommodating at least a part of the first waveguide, the second waveguide, and the antenna. ### Claim 9 (depends on 4) The waveguide converter of claim 4, wherein the first waveguide and the second waveguide are arranged on the opposite side from an emitting surface of an antenna. ### Claim 10 (depends on 9) The waveguide converter of claim 9, further comprising a radome for accommodating at least a part of the first waveguide, the second waveguide, and the antenna. ### Claim 11 A waveguide converter, comprising: a first waveguide configured to propagate an electromagnetic wave in a first direction; a second waveguide configured to receive, as an input, the electromagnetic wave from the first waveguide and configured to propagate the input electromagnetic wave in a second direction different from the first direction; an elongated-plate-shaped inner conductor arranged between the first waveguide and the second waveguide such that end portions of the inner conductor are exposed to an inside of the first waveguide and an inside of the second waveguide; and an insulator configured to electrically insulate the inner conductor from inside walls of the first waveguide and inside walls of the second waveguide; the inner conductor having a first section of a first width, the first section being exposed to the inside of the first waveguide, a second section of a second width, the second section being exposed to the inside of the second waveguide, and the first width being wider than the second width; and the insulator including a cylindrical portion that fits onto at least a part of the second section. ### Claim 12 (depends on 4) The waveguide converter of claim 4, wherein the first waveguide and the second waveguide have central axes that do not intersect. ### Claim 13 (depends on 4) The waveguide converter of claim 4, wherein the first waveguide has a rectangular cross section, and a width of a first side face of the first waveguide that faces the second waveguide and a width of another first side face of the first waveguide that opposes the first side face are narrower than widths of second side faces that are perpendicular to the first side faces. ### Claim 14 (depends on 1) The waveguide converter of claim 1, wherein the second section and the convex portion have substantially the same width. ### Claim 15 (depends on 14) The waveguide converter of claim 14, wherein the inner conductor has a to-be-supported section that extends from at least one of the first section and the convex portion by a predetermined length in a direction perpendicular to the elongating axis of the inner conductor. ### Claim 16 (depends on 15) The waveguide converter of claim 15, wherein the first waveguide has a supporting portion for supporting the to-be-supported section, the supporting portion being provided to a side face of the first waveguide. ### Claim 17 (depends on 11) The waveguide converter of claim 11, wherein the first waveguide and the second waveguide have central axes that do not intersect. ### Claim 18 (depends on 11) The waveguide converter of claim 11, wherein the first waveguide has a rectangular cross section, and a width of a first side face of the first waveguide that faces the second waveguide and a width of another first side face of the first waveguide that opposes the first side face are narrower than widths of second side faces that are perpendicular to the first side faces. ### Claim 19 (depends on 11) The waveguide converter of claim 11, wherein the second section and the convex portion have substantially the same width. ### Claim 20 (depends on 11) The waveguide converter of claim 11, wherein the first waveguide and the second waveguide are arranged on the opposite side from an emitting surface of an antenna.