CN112952339A - Broadband circularly polarized phased array antenna for satellite communication - Google Patents
Broadband circularly polarized phased array antenna for satellite communication Download PDFInfo
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- CN112952339A CN112952339A CN202110254495.0A CN202110254495A CN112952339A CN 112952339 A CN112952339 A CN 112952339A CN 202110254495 A CN202110254495 A CN 202110254495A CN 112952339 A CN112952339 A CN 112952339A
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- cylindrical structure
- mounting substrate
- oscillator
- circularly polarized
- feed
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
- H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
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- Variable-Direction Aerials And Aerial Arrays (AREA)
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Abstract
The invention discloses a broadband circularly polarized phased array antenna for satellite communication, and belongs to the technical field of antennas. The oscillator comprises an oscillator radiation unit and a mounting substrate; the mounting substrate is provided with a mounting hole for mounting the oscillator radiation unit; the oscillator radiating unit comprises a feed balun; the feed balun comprises a cylindrical structure, wherein a filling medium is arranged in the cylindrical structure, two pairs of metal arms extending outwards are arranged on the edge of the top of the cylindrical structure, and two strip-shaped grooves extending to the top are also formed in the cylindrical structure; the bottom of the oscillator radiation unit is connected with a feed connector, the feed connector and the outer shell are fixed with the mounting substrate, and an inner conductor of the feed connector extends upwards and is connected with one of the metal arms through a metal branch. The invention has simple structure, easy processing, convenient installation, good stability and low cost, and is suitable for batch production.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a broadband circularly polarized phased array antenna for satellite communication.
Background
In recent years, with the development of wireless communication systems, the number of users is increasing day by day, and the spectrum resources are becoming more and more tight. The circularly polarized antenna has advantages in multipath interference resistance and cloud and rain interference suppression, and can receive linear polarization in any polarization form and circularly polarized incoming waves consistent with the linear polarization. The broadband technology has the advantages of high transmission rate, low transmitting power, strong cruising ability, strong penetration ability, high multipath resolution and the like, is a key component of a broadband wireless communication system, and directly influences the performance of the whole broadband system. Therefore, an antenna with broadband circular polarization function, which has high stability, strong penetration capability, large communication capacity and good confidentiality, is urgently needed in the field of modern communication. In a satellite communication system, a broadband circularly polarized antenna is adopted for signal transmission, so that the normal operation of a communication link can be guaranteed.
In the application of satellite-borne, ship-borne, airborne or vehicle-mounted platforms, the requirements on the physical characteristics of the phased array antenna such as space volume, weight and the like and the environmental adaptability are strict. Modern communication systems often adopt miniaturized broadband circularly polarized antennas as transmitters and receivers of the communication systems, and the antennas are required to meet circular polarization performance, and simultaneously achieve the purposes of small size, light weight and wide frequency band, and increasingly high requirements are provided for the design of the circularly polarized antennas, such as working bandwidth, axial ratio bandwidth, high gain and the like, in order to meet market competition requirements, the antennas are also required to be simple in structure, low in cost, capable of being produced in batches and the like.
The performance of a miniaturized wideband circularly polarized phased array antenna mainly depends on the performance of antenna elements in the antenna array, such as the operating bandwidth, the beam width, the gain, and the like, but has the following disadvantages:
1. the working bandwidth is as follows: the circularly polarized antenna is required to have characteristics such as a wide operating band and wide beam width angle scanning. The impedance bandwidth of a common circularly polarized antenna is narrow, generally about 10%, and the specific bandwidth of a circularly polarized axis is limited, so that the requirement of equipment cannot be met, and the application potential of the antenna in the fields of satellite communication, vehicle-mounted and airborne communication and the like is limited.
2. High gain: the communication antenna unit with high gain can not only improve the communication quality, but also reduce the scale of the antenna array surface, realize low cost and miniaturization, and can solve the problem that the satellite communication capability is limited in the limited space of platforms such as satellite-borne platforms, airborne platforms, vehicle-mounted platforms and the like.
3. In the structural aspect: when the antenna is used for a satellite platform, the space is limited, the satellite environment is harsh, a miniaturized antenna resistant to the satellite-borne environment is required to be adopted, and meanwhile, an effective mutual coupling suppression method is required to be adopted, so that the isolation between the antennas is improved.
Disclosure of Invention
In view of the above, the present invention provides a wideband circularly polarized phased array antenna for satellite communication. The antenna has the characteristics of high gain, high isolation, good environmental adaptability and satellite-borne environment resistance, and has the advantages of simple structure, easiness in processing, convenience in installation, good stability, low cost and suitability for batch production.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a miniaturized broadband circularly polarized phased array antenna for satellite communication includes an oscillator radiation unit and a mounting substrate; the mounting substrate is provided with a mounting hole for mounting the oscillator radiation unit; the placing holes are uniformly distributed on the mounting substrate;
the oscillator radiating unit comprises a feed balun; the feed balun comprises a cylindrical structure, wherein a filling medium is arranged in the cylindrical structure, two pairs of metal arms extending outwards are arranged on the edge of the top of the cylindrical structure, and two strip-shaped grooves extending to the top are also formed in the cylindrical structure; each pair of metal arms and the strip-shaped groove are centrosymmetric about the circle center of the cylindrical structure;
the bottom of the oscillator radiation unit is connected with a feed connector, an outer conductor of the feed connector is fixedly connected with the mounting substrate, and an inner conductor of the feed connector extends upwards and is connected with one of the metal arms through a metal branch.
Furthermore, a square flange for fixing is arranged at the connecting position of the oscillator radiation unit and the feed connector, the placing hole is of a square structure, and an annular bulge corresponding to the square flange is arranged on the inner wall of the placing hole.
Furthermore, the arrangement holes on the mounting substrate are arranged in a triangular shape or a rectangular shape.
The invention adopts the technical scheme to produce the beneficial effects that:
1. the working frequency band is wide. The percentage bandwidth of the operating bandwidth of the present invention is 46.5%. The problem that the space volume and the weight of the phased array antenna are limited can be solved.
2. Wide angular to axial ratio. The invention adopts a sequential rotating feed technology, and the axial ratio is less than 2.5dB within the range of +/-60 degrees. The broadband circularly polarized phased array antenna disclosed by the invention has the advantages that the oscillator units are isolated by utilizing the isolation structure, the port isolation degree is higher, and the isolation performance is improved.
3. And (4) miniaturization. The size of the oscillator radiation unit is 0.47 times of the wavelength, the oscillator radiation unit has the characteristic of miniaturization, and can be used for communication platforms such as satellite-borne, ship-borne, airborne and vehicle-borne.
4. And the mass production of engineering can be realized. The invention has the characteristics of simple structure, high reliability and easy processing, and is convenient for realizing the mass production in engineering.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of the subarray structure of fig. 1.
Fig. 3 is a schematic diagram of the structure of the radiating element of fig. 1.
Fig. 4 is a cross-sectional view of fig. 3.
In the figure: 1. metal arm, 2, metal branch knot, 3, cylindrical structure, 4, feed joint outer conductor, 5, filling medium, 6, inner conductor, 7, square flange.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
A miniaturized broadband circularly polarized phased array antenna for satellite communication includes an oscillator radiation unit and a mounting substrate; the mounting substrate is provided with a mounting hole for mounting the oscillator radiation unit; the placing holes are uniformly distributed on the mounting substrate;
the oscillator radiating unit comprises a feed balun; the feed balun comprises a cylindrical structure 3, a filling medium 5 is arranged in the cylindrical structure, two pairs of metal arms 1 extending outwards are arranged on the edge of the top of the cylindrical structure, and two strip-shaped grooves extending to the top are formed in the cylindrical structure; each pair of metal arms and the strip-shaped groove are centrosymmetric about the circle center of the cylindrical structure;
the bottom of the oscillator radiating unit is connected with a feed joint, an outer conductor 4 of the feed joint is fixedly connected with the mounting substrate, and an inner conductor 6 of the feed joint extends upwards and is connected with one of the metal arms through the metal branch 2.
Furthermore, a square flange 7 for fixing is arranged at the connecting position of the oscillator radiation unit and the feed connector, the placing hole is of a square structure, and an annular bulge corresponding to the square flange is arranged on the inner wall of the placing hole.
Furthermore, the arrangement holes on the mounting substrate are arranged in a triangular shape or a rectangular shape.
The following is a more specific example:
as shown in fig. 1 to 4, the present embodiment includes at least one wideband circularly polarized antenna sub-array, and the wideband circularly polarized phased array antenna sub-array includes an element radiation unit, a feed connector, and a mounting substrate.
The oscillator radiation unit is composed of a metal shell and an internal filling medium, the metal shell is composed of two pairs of metal arms and a feed balun, two strip-shaped grooves are formed in the feed balun, and the two strip-shaped grooves are centrosymmetric about the circle center of the cylindrical structure.
The size of the metal shell is adjustable, and the metal arm and the feed balun are integrally processed.
The feed joint outer conductor and the mounting substrate are integrally processed.
The inner conductor penetrates through the outer shell of the oscillator radiation unit and the outer shell of the feed connector, and the oscillator radiation unit can change the circular polarization rotation direction by adjusting the two pairs of metal arms, so that left-hand circular polarization or right-hand circular polarization is realized.
The arrangement mode of the oscillator radiation units can be rectangular or triangular. In this embodiment, a triangular arrangement is adopted.
The antenna subarrays can be spliced into broadband circularly polarized phased array antennas of different scales.
In this embodiment, the antenna may be composed of M broadband circularly polarized antenna subarrays, where M is a natural number and M is 6.
In this embodiment, the length of the oscillator arm of the oscillator radiation unit is 0.4 times the wavelength; the strip-shaped slot width of the feed balun is 0.03 times of wavelength; the strip-shaped slot depth of the feed balun is 0.16 times of the wavelength.
The metal arm connected with the cylindrical structure uses an asymmetric oscillator structure and can be used for realizing the radiation characteristic of circular polarization.
The feed balun uses a slotted coaxial balun, and two strip-shaped slots on the feed balun are symmetrical about the center of a circle of a cylindrical structure.
The asymmetric oscillator radiating unit penetrates through the mounting substrate to be connected with the bottom feed connector and is fixed in a threaded and gluing mode.
As a preferred scheme, when arranging the dipole radiation units in the broadband circularly polarized phased array antenna subarray, a triangular arrangement mode is adopted.
The invention can be used for array antennas, one-dimensional phased array antennas and two-dimensional phased array antennas; the method can be used for spaceborne, airborne, shipborne, vehicular and other platforms.
Claims (3)
1. A broadband circularly polarized phased array antenna for satellite communication is characterized by comprising an oscillator radiation unit and a mounting substrate; the mounting substrate is provided with a mounting hole for mounting the oscillator radiation unit; the placing holes are uniformly distributed on the mounting substrate;
the oscillator radiating unit comprises a feed balun; the feed balun comprises a cylindrical structure, wherein a filling medium is arranged in the cylindrical structure, two pairs of metal arms extending outwards are arranged on the edge of the top of the cylindrical structure, and two strip-shaped grooves extending to the top are also formed in the cylindrical structure; each pair of metal arms and the strip-shaped groove are centrosymmetric about the circle center of the cylindrical structure;
the bottom of the oscillator radiation unit is connected with a feed connector, an outer conductor of the feed connector is fixedly connected with the mounting substrate, and an inner conductor of the feed connector extends upwards and is connected with one of the metal arms through a metal branch.
2. The broadband circularly polarized phased array antenna for satellite communication according to claim 1, wherein a square flange for fixing is arranged at a connection position of the oscillator radiation unit and the feed connector, the placement hole is of a square structure, and an annular protrusion corresponding to the square flange is arranged on the inner wall of the placement hole.
3. The wideband circularly polarized phased array antenna for satellite communication according to claim 1, wherein the placement holes on the mounting substrate are arranged in a triangular or rectangular pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110254495.0A CN112952339A (en) | 2021-03-09 | 2021-03-09 | Broadband circularly polarized phased array antenna for satellite communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110254495.0A CN112952339A (en) | 2021-03-09 | 2021-03-09 | Broadband circularly polarized phased array antenna for satellite communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112952339A true CN112952339A (en) | 2021-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110254495.0A Pending CN112952339A (en) | 2021-03-09 | 2021-03-09 | Broadband circularly polarized phased array antenna for satellite communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112952339A (en) |
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2021
- 2021-03-09 CN CN202110254495.0A patent/CN112952339A/en active Pending
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