# US 12,763,452 B2 · Planar antenna and vehicle window glass > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,763,452 B2 - Document ID: US12763452B2 - Status: Granted - Kind: B2 - Application number: 18/635,194 - Filed: 2024-04-15 - Published: 2024-08-15 - Granted: 2026-10-13 - Earliest claimed: 2021-10-18 - Assignees: AGC Inc. - Applicants: AGC Inc. - Inventors: Shoichi Takeuchi; Yusuke Kato; Toshiki Sayama; Hideaki Shoji - Web page: https://patentgrep.com/patent/US12763452B2 ## CPC - H01Q 1/1271: {for mounting on windscreens} - H01Q 5/364: Creating multiple current paths - H01Q 13/106: {Microstrip slot antennas (patch antenna elements H01Q9/0407)} - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract A planar antenna comprising a slot formed in a flat conductor, wherein the slot includes a first slot extending in a first direction between a first feeding point and a second feeding point, a second slot extending in a second direction different from the first direction from an end portion of the first slot, a third slot extending in a fourth direction opposite to the second direction from an end portion of the first slot in a third direction opposite to the first direction, reaching an open end in the fourth direction, and a J-shaped slot extending from an end portion of the second slot in the second direction to an open end open in the first direction, and wherein a slot width at an open end of the J-shaped slot is wider than a slot width at the end portion of the second slot in the second direction. ## Claims ### Claim 1 A planar antenna comprising: a slot formed in a flat conductor, wherein the slot includes a first slot extending in a first direction between a first feeding point and a second feeding point, a second slot extending in a second direction different from the first direction from an end portion of the first slot in the first direction, a third slot extending in a fourth direction opposite to the second direction from an end portion of the first slot in a third direction opposite to the first direction, reaching an open end open in the fourth direction, and a J-shaped slot extending in a J-shape from an end portion of the second slot in the second direction to an open end open in the first direction, wherein a slot width at an open end of the J-shaped slot is wider than a slot width at the end portion of the second slot in the second direction, wherein the J-shaped slot includes a portion that extends in the first direction while maintaining an approximately uniform slot width, and wherein the J-shaped slot has an outline resembling half of an ellipse with a long axis approximately parallel to the second direction. ### Claim 2 (depends on 1) The planar antenna according to claim 1, wherein the J-shaped slot has a curved outline. ### Claim 3 (depends on 2) The planar antenna according to claim 2, wherein the J-shaped slot includes a portion where a slot width gradually increases. ### Claim 4 (depends on 1) The planar antenna according to claim 1, wherein the conductor has a first outer edge where an open end of the J-shaped slot is located and a second outer edge opposite to the first outer edge, and wherein the second outer edge includes a curved portion. ### Claim 5 (depends on 4) The planar antenna according to claim 4, wherein an end portion of the second outer edge has an outline resembling ¼ or less of an ellipse with a long axis approximately parallel to the second direction. ### Claim 6 (depends on 1) The planar antenna according to claim 1, wherein a slot length of the second slot is shorter than a slot length of the first slot. ### Claim 7 (depends on 1) The planar antenna according to claim 1, wherein an outer edge where an open end of the third slot is located includes a portion parallel to an imaginary line that passes through the open end of the third slot and that extends at right angles to a direction in which the third slot extends. ### Claim 8 (depends on 1) The planar antenna according to claim 1, wherein an outer edge where an open end of the third slot is located includes a portion inclined with respect to an imaginary line that passes through the open end of the third slot and that extends at right angles to a direction in which the third slot extends. ### Claim 9 (depends on 1) The planar antenna according to claim 1, wherein the third slot includes a portion where a slot width is wider than the first slot. ### Claim 10 (depends on 1) The planar antenna according to claim 1, wherein a matching circuit connected to the first feeding point and the second feeding point is mounted on the planar antenna. ### Claim 11 (depends on 1) A vehicle window glass comprising: the planar antenna as defined in claim 1. ### Claim 12 (depends on 11) The vehicle window glass according to claim 11, comprising: a first glass plate; and a second glass plate that faces the first glass plate, wherein the planar antenna is disposed between the first glass plate and the second glass plate. ### Claim 13 (depends on 11) The vehicle window glass according to claim 11, wherein the planar antenna is part or all of a plurality of antennas that are included in a diversity antenna or a MIMO antenna. ### Claim 14 (depends on 11) The vehicle window glass according to claim 11 that is used for a windshield, a side glass, a rear glass, or a roof glass. ### Claim 15 A planar antenna comprising: a slot formed in a flat conductor, wherein the slot includes a first slot extending in a first direction between a first feeding point and a second feeding point, a second slot extending in a second direction different from the first direction from an end portion of the first slot in the first direction, a third slot extending in a fourth direction opposite to the second direction from an end portion of the first slot in a third direction opposite to the first direction, reaching an open end open in the fourth direction, and a J-shaped slot extending in a J-shape from an end portion of the second slot in the second direction to an open end open in the first direction, wherein the J-shaped slot is a slot bent in a J-shape, and wherein the J-shaped slot includes a fourth slot extending in the third direction from another end of the second slot in the second direction, a fifth slot extending in the second direction, and a sixth slot extending in the first direction. ### Claim 16 (depends on 15) The planar antenna according to claim 15, wherein a slot width of the sixth slot is wider than a slot width of the fifth slot, and wherein the slot width of the fifth slot is wider than a slot width of the fourth slot. ### Claim 17 (depends on 15) The planar antenna according to claim 15, wherein a slot length of the fifth slot is longer than a slot length of the fourth slot and longer than a slot length of the sixth slot.