# US 9,437,926 B2 · Antenna having asymmetric T shape coupled feed > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,437,926 B2 - Document ID: US9437926B2 - Status: Granted - Kind: B2 - Application number: 14/557,016 - Filed: 2014-12-01 - Published: 2016-06-02 - Granted: 2016-09-06 - Earliest claimed: 2014-12-01 - Assignees: Wistron Corporation - Applicants: Wistron Corporation - Inventors: Mohammed Ziaul Azad; Firass Badaruzzaman; Hou-Chun Huang - Web page: https://patentgrep.com/patent/US9437926B2 ## CPC - H01Q 5/378: Combination of fed elements with parasitic elements - H01Q 1/50: Structural association of antennas with earthing switches, lead-in devices or lightning protectors - H01Q 5/371: Branching current paths - H01Q 9/04: Resonant antennas - H01Q 9/42: with folded element, the folded parts being spaced apart a small fraction of the operating wavelength - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract A broadband antenna for interfacing an electronic device with a plurality of radio access technologies is provided. The antenna includes an excitation element and a parasitic element. The excitation element includes a feed line with a first distal end and a second distal end with first and second arms extending from the second distal end, wherein one of the first or second arms is shorter than the other such that the excitation element forms an asymmetrical T shape. The length of the first and second arms determines at least two modes of operation of the antenna. The parasitic element wraps around the asymmetrical T shape and includes a length configured to provide another mode of operation of the antenna. ## Claims ### Claim 1 An antenna, comprising: an excitation element configured for coupling to an antenna feed carrying an excitation signal produced by a signal source; and a parasitic element including a ground connection and a parasitic element length, wherein the excitation element includes: a feed line with a first distal end and a second distal end separated by a feed line length; a first arm including a first arm length, wherein the first arm length extends from the second distal end in a first direction from the feed line length; and a second arm including a second arm length, wherein the second arm length extends from the second distal end in a second direction from the excitation element length; and wherein the parasitic element length is at least partially coextensive with the excitation element, such that a first gap including a first gap separation distance is formed between the parasitic element and the first arm and a second gap including a second gap separation distance is formed between the parasitic element and the second arm, and wherein the first arm length is less than the second arm length and the ground connection of the parasitic element is located closer to the first arm than the second arm. ### Claim 2 (depends on 1) The antenna of claim 1, wherein the antenna feed connects to the first distal end at a feed point of the excitation element. ### Claim 3 (depends on 2) The antenna of claim 2, wherein the third gap separation distance is between 0.1 and 1 mm. ### Claim 4 (depends on 1) The antenna of claim 1, wherein a third gap including a third gap separation distance is formed between the parasitic element and the feed line. ### Claim 5 (depends on 1) The antenna of claim 1, wherein the first arm length and the second arm length are substantially perpendicular to the feed line, and the first direction and the second direction are substantially opposite directions. ### Claim 6 (depends on 5) The antenna of claim 5, wherein the parasitic element length includes a first portion, a second portion, a third portion, a fourth portion, a fifth portion and a sixth portion, and the first portion is substantially parallel to the feed line, the second portion is substantially parallel to the first arm and the sixth portion is substantially parallel to the second arm. ### Claim 7 (depends on 6) The antenna of claim 6, wherein the third portion is substantially perpendicular to the second portion, the fourth portion is substantially perpendicular to the third portion and the fifth portion is substantially perpendicular to both the fourth portion and the sixth portion. ### Claim 8 (depends on 7) The antenna of claim 7, wherein the fourth portion includes a plurality of first and second sections, and the first sections are arranged along a first axis spanning between the third portion and the fifth portion and the second sections are arranged along a second axis spanning between the third portion and the fifth portion. ### Claim 9 (depends on 8) The antenna of claim 8, wherein the first axis and the second axis are parallel to each other. ### Claim 10 (depends on 7) The antenna of claim 7, wherein a thickness of the third portion of the parasitic element is different than a thickness of the fourth portion of the parasitic element. ### Claim 11 (depends on 1) The antenna of claim 1, wherein the first gap separation distance is between 0.1 and 1 mm. ### Claim 12 (depends on 1) The antenna of claim 1, wherein the second gap separation distance is between 0.1 and 1 mm. ### Claim 13 (depends on 1) The antenna of claim 1, wherein the parasitic element length is approximately between 78 and 106 millimeters, the first arm length is approximately between 25 and 30 millimeters, and the second arm length is approximately between 34 and 44 millimeters. ### Claim 14 (depends on 1) The antenna of claim 1, wherein the parasitic element is substantially coextensive with an entirety of the first arm length. ### Claim 15 (depends on 14) The antenna of claim 14, wherein the parasitic element is coextensive with less than half of the second arm length. ### Claim 16 (depends on 1) The antenna of claim 1, wherein the parasitic element length comprises a plurality of portions and at least one portion of the parasitic element length is thicker than other portions of the plurality of portions of the parasitic element length. ### Claim 17 An electronic device having a broadband antenna and capable of wireless transmissions comprising: a wireless signal module; and an antenna electrically connected to the wireless signal module, the antenna comprising: an excitation element configured for coupling to an antenna feed carrying an excitation signal produced by a signal source; and a parasitic element including a ground connection and a parasitic element length, wherein the excitation element includes: a feed line with a first distal end and a second distal end separated by a feed line length; a first arm including a first arm length, wherein the first arm length extends from the second distal end in a first direction from the feed line; and a second arm including a second arm length, wherein the second arm length extends from the second distal end in a second direction from the feed line; and wherein the parasitic element length is at least partially coextensive with the excitation element such that a first gap including a first gap separation distance is formed between the parasitic element and the first arm and a second gap including a second gap separation distance is formed between the parasitic element and the second arm, and wherein the first arm length is less than the second arm length and the ground connection of the parasitic element is located closer to the first arm than the second arm. ### Claim 18 (depends on 17) The electronic device of claim 17, wherein the antenna feed connects to the first distal end at a feed point of the excitation element. ### Claim 19 (depends on 17) The electronic device of claim 17, wherein a third gap including a third gap separation distance is formed between the parasitic element and the feed line. ### Claim 20 (depends on 17) The electronic device of claim 17, wherein the first arm length and the second arm length are substantially perpendicular to the feed line, and the first direction and the second direction are substantially opposite directions. ### Claim 21 (depends on 20) The electronic device of claim 20, wherein the parasitic element length includes a first portion, a second portion, a third portion, a fourth portion, a fifth portion and a sixth portion, and the first portion is substantially parallel to the feed line, the second portion is substantially parallel to the first arm and the sixth portion is substantially parallel to the second arm. ### Claim 22 (depends on 21) The electronic device of claim 21, wherein the third portion is substantially perpendicular to the second portion, the fourth portion is substantially perpendicular to the third portion and the fifth portion is substantially perpendicular to both the fourth portion and the sixth portion. ### Claim 23 A broadband antenna, comprising: an excitation element configured for coupling to an antenna feed carrying an excitation signal produced by a signal source; and a parasitic element including a parasitic element length, wherein the excitation element includes: a feed line with a first distal end and a second distal end separated by an excitation element length; a first arm including a first arm length, wherein the first arm length extends from the second distal end in a first direction from the excitation element length; a second arm including a first end and a second end with a second arm length spanning the distance between the first end and the second end, the first end of the second arm is attached to the second distal end of the excitation element, wherein the second arm length extends from the second distal end in a second direction from the excitation element length; and a second arm extension connected to the second end of the second arm, wherein the second arm extension includes a second arm extension length that extends perpendicular to the second arm length, and wherein the parasitic element length is at least partially coextensive with the excitation element, and wherein the first direction is opposite the second direction. ### Claim 24 (depends on 23) The broadband antenna of claim 23, wherein a first gap including a first gap separation distance is formed between the parasitic element and the first arm and a second gap including a second gap separation distance is formed between the parasitic element and the second arm extension. ### Claim 25 (depends on 23) The broadband antenna of claim 23, wherein the parasitic element is substantially coextensive only with the first arm length and the second arm extension length.