# US 2020/0403304 A1 · Dual-frequency current-balancing quadrifilar helical antenna > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0403304 A1 - Document ID: US20200403304A1 - Status: Published application - Kind: A1 - Application number: 16/977,067 - Filed: 2019-12-06 - Published: 2020-12-24 - Earliest claimed: 2018-12-07 - Assignees: Harxon Corporation - Applicants: Harxon Corporation - Inventors: Wenping WU; Jie WANG - Web page: https://patentgrep.com/patent/US20200403304A1 ## CPC - H01Q 1/50: Structural association of antennas with earthing switches, lead-in devices or lightning protectors - H01Q 11/08: Helical antennas - H01Q 1/362: {for broadside radiating helical antennas} - H01Q 1/48: Earthing means; Earth screens; Counterpoises - H01Q 5/371: Branching current paths - H01Q 9/27: Spiral antennas - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract The present disclosure relates to the technical field of antennas and provides a dual-frequency current-balancing quadrifilar helical antenna, which belongs to the technical field of antennas in multi-mode global satellite navigation system. The dual-frequency current-balancing quadrifilar helical antenna comprises a radiating part and a feeding part, wherein: the radiating part comprises a hollow column and four sets of spiral arms with the same specifications and equal intervals; the spiral arms are wound on a surface of the hollow column and the feeding part is mounted at an end of the hollow column; each set of spiral arms comprises a main radiating arm and an auxiliary radiating arm; terminals of the main radiating arm and the auxiliary radiating arm are open-circuited or short-circuited, and a coupling component is arranged at an open-circuited or short-circuited terminal. The dual-frequency current-balancing quadrifilar helical antenna provided in the present disclosure can increase the energy of a parasitic frequency band, improve the performance of the parasitic frequency band, and reduce the size of the antenna. ## Claims ### Claim 1 A dual-frequency current-balancing quadrifilar helical antenna, comprising a radiating part and a feeding part; wherein: the radiating part includes a hollow column and four sets of spiral arms with same specifications and equal intervals; the spiral arms are wound on a surface of the hollow column and the feeding part are mounted at an end of the hollow column; each set of the spiral arms includes a main radiating arm and an auxiliary radiating arm, terminals of the main radiating arm and the auxiliary radiating arm being open-circuited or short-circuited; and a coupling component is arranged between the main radiating arm and the auxiliary radiating arm. ### Claim 2 (depends on 1) The dual-frequency current-balancing quadrifilar helical antenna of claim 1, further comprising an outer housing and a cable, wherein the radiating part and the feeding part are wrapped in the outer housing, and the cable is connected with the feeding part. ### Claim 3 (depends on 2) The dual-frequency current-balancing quadrifilar helical antenna of claim 2, wherein spiral rising angles of the main radiating arm and the auxiliary radiating arm are the same or different. ### Claim 4 (depends on 3) The dual-frequency current-balancing quadrifilar helical antenna of claim 3, wherein: the feeding part comprises a circular polarized feeding component, the circular polarized feeding component being a network splitting one into four subnets consisting of an electrical bridge or pure media; an input port of the network is connected with the cable; each output port has the same amplitude and a phases difference of 90° in sequence; and four output ports are connected with four sets of spiral arms, respectively. ### Claim 5 (depends on 1) The dual-frequency current-balancing quadrifilar helical antenna of claim 1, wherein: a rotation direction of the main radiating arm and the auxiliary radiating arm is right-handed or left-handed; the widths of the main radiating arm and the auxiliary radiating arm are uniform or gradually varied; and the terminals of the main radiating arm and the auxiliary radiating arm are open-circuited or short-circuited. ### Claim 6 (depends on 1) The dual-frequency current-balancing quadrifilar helical antenna of claim 1, wherein the spiral arms are made by printing on a dielectric substrate, and the hollow column is a low-loss material or consists of air. ### Claim 7 (depends on 1) The dual-frequency current-balancing quadrifilar helical antenna of claim 1, wherein the coupling component comprises two coupling plates with flush ends arranged on the main radiating arm and the auxiliary radiating arm, respectively. ### Claim 8 (depends on 1) The dual-frequency current-balancing quadrifilar helical antenna of claim 1, wherein the coupling component comprises two coupling plates with zigzag-shaped ends arranged on the main radiating arm and the auxiliary radiating arm, respectively. ### Claim 9 (depends on 1) The dual-frequency current-balancing quadrifilar helical antenna of claim 1, wherein the coupling component comprises a coupling plate printed on back of the spiral arm. ### Claim 10 (depends on 1) The dual-frequency current-balancing quadrifilar helical antenna of claim 1, wherein an arrangement direction of the coupling component is perpendicular to an overall arrangement direction of the dual-frequency current-balancing quadrifilar helical antenna.