# US 10,483,631 B2 · Decoupled concentric helix antenna > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,483,631 B2 - Document ID: US10483631B2 - Status: Granted - Kind: B2 - Application number: 15/276,227 - Filed: 2016-09-26 - Published: 2018-03-29 - Granted: 2019-11-19 - Earliest claimed: 2016-09-26 - Assignees: The MITRE Corporation - Applicants: The MITRE Corporation - Inventors: Ian T. McMichael; Erik T. Lundberg; Mohamed Wajih Elsallal - Web page: https://patentgrep.com/patent/US10483631B2 ## CPC - H01Q 1/362: {for broadside radiating helical antennas} - H01Q 1/241: {used in mobile communications, e.g. GSM (H01Q1/247, H01Q1/248 take precedence)} - H01Q 1/48: Earthing means; Earth screens; Counterpoises - H01Q 5/30: Arrangements for providing operation on different wavebands - H01Q 5/321: within a radiating element or between connected radiating elements - H01Q 9/145: {by varying the electrical length} - H01Q 11/08: Helical antennas - H01Q 21/24: Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction {(circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001)} - H01Q 21/30: Combinations of separate antenna units operating in different wavebands and connected to a common feeder system - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract A multi-band helix antenna including one or more first arms extending helically about an axis at a first distance from the axis; and one or more second arms extending helically about the axis at a second distance from the axis that is greater than the first distance, wherein each of the one or more second arms comprises at least one trap circuit configured to have a first impedance at a resonant frequency of the one or more first arms and a second impedance at a resonant frequency of the one or more second arms, and the first impedance is greater than the second impedance. ## Claims ### Claim 1 A multi-band helix antenna comprising: one or more first arms extending helically about an axis at a first distance from the axis; and one or more second arms extending helically about the axis at a second distance from the axis that is greater than the first distance, wherein each of the one or more second arms comprises at least one trap circuit configured to have a first impedance at a resonant frequency of the one or more first arms that breaks each of the one or more second arms into multiple sections at the resonant frequency of the one or more first arms so that the one or more second arms are decoupled from the one or more first arms at the resonant frequency of the one or more first arms and a second impedance at a resonant frequency of the one or more second arms, and the first impedance is greater than the second impedance. ### Claim 2 (depends on 1) The antenna of claim 1, wherein each of the one or more second arms comprises a first radiating section electrically connected to a second radiating section by a trap circuit. ### Claim 3 (depends on 1) The antenna of claim 1, wherein the at least one trap circuit comprises at least one inductor in parallel with at least one capacitor. ### Claim 4 (depends on 1) The antenna of claim 1, wherein the first impedance is at least an order of magnitude greater than the second impedance. ### Claim 5 (depends on 1) The antenna of claim 1, wherein the resonant frequency of the one or more first arms is within a predefined frequency band and a peak impedance of the at least one trap circuit is at a frequency within the predefined frequency band. ### Claim 6 (depends on 1) The antenna of claim 1, wherein the resonant frequency of the one or more first arms is within a predefined frequency band and a peak impedance of the at least one trap circuit is at a frequency outside of the predefined frequency band. ### Claim 7 (depends on 1) The antenna of claim 1, wherein the resonant frequency of the one or more first arms is within a first predefined satellite communication band and the resonant frequency of the one or more second arms is within a second predefine satellite communication band that does not overlap with the first satellite communication band. ### Claim 8 (depends on 7) The antenna of claim 7, wherein the first predefined satellite communication band is GPS L1 and the second predefined satellite communication band is GPS L2. ### Claim 9 (depends on 1) The antenna of claim 1, wherein each of the one or more first arms and each of the one or more second arms comprises a feed point at a first end of the antenna for providing signals to the first and second arms. ### Claim 10 (depends on 9) The antenna of claim 9, wherein the antenna generates a circularly polarized radiation field in response to receiving a signal through at least some of the feed points. ### Claim 11 (depends on 9) The antenna of claim 9, comprising a feed network electrically connected to feed points. ### Claim 12 (depends on 1) The antenna of claim 1, comprising a ground plane at a first end of the antenna. ### Claim 13 (depends on 1) The antenna of claim 1, wherein each of the one or more second arms completes at least one helical turn. ### Claim 14 (depends on 1) The antenna of claim 1, wherein each of the one or more second arms comprises a plurality of trap circuits that are evenly spaced along the arm. ### Claim 15 (depends on 1) The antenna of claim 1, wherein the one or more first arms comprise a left-hand wind for reception of right-hand circularly polarized signals. ### Claim 16 (depends on 1) The antenna of claim 1, wherein the one or more first arms and the one or more second arms comprise strips of electrically conductive material printed on a dielectric substrate. ### Claim 17 (depends on 1) The antenna of claim 1, wherein the at least one trap circuit comprises a surface mount component or a printed circuit component. ### Claim 18 (depends on 1) The antenna of claim 1, wherein the antenna is quadrifilar antenna. ### Claim 19 A multi-band quadrifilar helix antenna comprising: four first arms extending helically about an axis at a first distance from the axis; four second arms extending helically about the axis at a second distance from the axis that is greater than the first distance, wherein each second arm comprises at least one trap circuit configured to have an impedance at a resonant frequency of the first arms that breaks the respective second arm into multiple sections at the resonant frequency of the first arms so that the second arms are decoupled from the first arms at the resonant frequency of the first arms; a ground plane at the first end of the antenna that is electrically isolated from the first and second arms; and a feed network electrically connected to the first and second arms for feeding circularly polarized signals. ### Claim 20 A multi-band helix antenna comprising: one or more first arms extending helically about an axis at a first distance from the axis; one or more second arms extending helically about the axis at a second distance from the axis that is greater than the first distance, each of the one or more second arms comprising at least one trap circuit, wherein the at least one trap circuit is configured to have a first impedance at a resonant frequency of the one or more first arms that breaks each of the one or more second arms into multiple sections at the resonant frequency of the one or more first arms so that the one or more second arms are decoupled from the one or more first arms at the resonant frequency of the one or more first arms.