CN111786112A - Multi-band antenna with cross frequency band scattering suppression function - Google Patents
Multi-band antenna with cross frequency band scattering suppression function Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
- H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different wavebands
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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
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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Abstract
The invention discloses a multiband antenna with a cross-band scattering suppression function, which comprises at least one low-frequency sub-antenna and at least one high-frequency sub-antenna; the low-frequency sub-antenna and the high-frequency sub-antenna work in different frequency bands, the low-frequency sub-antenna comprises at least one radiation arm, the radiation arm is divided into a plurality of arm sections in the arm length direction, every two adjacent arm sections are connected through a decoupling structure, the decoupling structure is composed of a thin metal connecting line and at least one metal branch, the metal branch is connected with the thin metal connecting line, two ends of the thin metal connecting line are electrically connected with the two arm sections respectively, one end of the metal branch is electrically connected with the corresponding arm section, the other end of the metal branch is disconnected, high-frequency induced current on the metal branch can be offset with high-frequency induced current on the thin metal connecting line in a reverse direction, scattering interference of the low-frequency sub-antenna on the high-frequency sub-antenna is suppressed, and a stable high-frequency radiation directional diagram.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a multiband antenna having a cross-band scattering suppression function.
Background
As is known in the art, a multiband antenna can effectively improve the space utilization of the antenna and reduce the costs of antenna equipment and field rental while providing more diversified services. Therefore, multiband antennas are an important research direction in the field of new generation wireless communication. A multi-band antenna generally consists of sub-antennas operating in different frequency bands, including at least one low frequency sub-antenna and at least one high frequency sub-antenna.
Each sub-antenna in a multi-band antenna is placed in a limited space, and strong cross-band scattering interference exists between different sub-antennas. This will seriously degrade the performance of the multi-band antenna, in particular as a deterioration of the port isolation between different band sub-antennas, a distortion of the radiation pattern of the high frequency sub-antenna, etc., thereby adversely affecting the user experience.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a multiband antenna with a cross-band scattering suppression function, which can effectively suppress the scattering interference of a low-frequency sub-antenna on a high-frequency sub-antenna and obtain a stable high-frequency radiation directional diagram.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: a multi-band antenna with cross-band scattering suppression function comprises at least one low-frequency sub-antenna and at least one high-frequency sub-antenna; the low-frequency sub-antenna and the high-frequency sub-antenna work in different frequency bands, the low-frequency sub-antenna comprises at least one radiation arm, the radiation arm is divided into a plurality of arm sections in the arm length direction, every two adjacent arm sections are connected through a decoupling structure, the decoupling structure is composed of a thin metal connecting line and at least one metal branch, the metal branch is connected with the thin metal connecting line, two ends of the thin metal connecting line are electrically connected with the two arm sections respectively, one end of the metal branch is electrically connected with the corresponding arm section, and the other end of the metal branch is disconnected, so that high-frequency induced current on the metal branch can be reversely offset with high-frequency induced current on the thin metal connecting line, and scattering interference of the low-frequency sub-antenna on the high-frequency sub-antenna is suppressed.
Furthermore, the metal branch knots and the thin metal connecting wire are positioned on the same horizontal plane, and the metal branch knots are distributed on one side of the thin metal connecting wire.
Furthermore, the metal branches and the thin metal connecting wires are positioned on the same horizontal plane, and the metal branches are distributed on two sides of the thin metal connecting wires.
Furthermore, the metal branch nodes are positioned above or below the thin metal connecting lines, or above and below the thin metal connecting lines.
Further, the radiating arm is printed on a dielectric substrate or is in the form of a metal casting.
Furthermore, the working frequency band of the low-frequency sub-antenna is 690MHz to 960MHz, and the working frequency band of the high-frequency sub-antenna is 1690MHz to 2690 MHz.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. compared with the existing multiband antenna, the low-frequency sub-antenna of the antenna is provided with the decoupling structure, and the high-frequency induced current on the low-frequency sub-antenna is reversely cancelled by the decoupling structure, so that the scattering interference of the low-frequency sub-antenna on the high-frequency sub-antenna is inhibited, and the shape of the radiation pattern of the high-frequency sub-antenna is kept.
2. Compared with the existing multiband antenna, the decoupling structure designed in the antenna has wider decoupling bandwidth and has good scattering suppression effect in the frequency band of 1690MHz to 2690 MHz.
3. Compared with the existing multiband antenna, the decoupling structure designed in the antenna is electrically connected with the radiation arm of the low-frequency sub-antenna, so that the decoupling structure can be designed in the form of metal casting, and the cost of mass production of products is reduced.
4. Compared with the existing multiband antenna, the low-frequency sub-antenna of the antenna is provided with the decoupling structure, so that the scattering interference of the high-frequency sub-antenna by the frequency sub-antenna can be reduced to the maximum extent. Therefore, the antenna of the invention realizes shape preservation of a high-frequency radiation directional diagram without adding an additional metal baffle or adding a director for a high-frequency sub-antenna, which can greatly reduce the difficulty of product development, assembly and debugging and can ensure the consistency of product performance to the maximum extent.
Drawings
Fig. 1 is a plan view of a multiband antenna according to embodiment 1.
Fig. 2 is a perspective view of the multiband antenna according to embodiment 1.
Fig. 3 is a schematic view of a radiation arm structure of the low-frequency sub-antenna in embodiment 1.
Fig. 4 is a schematic view of a decoupling structure in embodiment 1.
Fig. 5 is a horizontal plane beam width graph of the high frequency sub-antenna of the multiband antenna described in embodiment 1 and the high frequency sub-antenna of the conventional multiband antenna.
Fig. 6 is a horizontal plane normalized radiation pattern of a high frequency sub-antenna in a conventional multi-band antenna.
Fig. 7 is a horizontal plane normalized radiation pattern of the high frequency sub-antenna of the multiband antenna described in embodiment 1.
Fig. 8 is a plan view of the multiband antenna according to embodiment 2.
Fig. 9 is a schematic view of a radiation arm structure of the low-frequency sub-antenna in embodiment 2.
Fig. 10 is a schematic view of a decoupling structure in embodiment 2.
Fig. 11 is a plan view of the multiband antenna according to embodiment 3.
Fig. 12 is a schematic view of a radiation arm structure of the low-frequency sub-antenna in embodiment 3.
Fig. 13 is a schematic view of a decoupling structure in embodiment 3.
Fig. 14 is a top view of the multiband antenna according to embodiment 4.
Fig. 15 is a top view of the radiation arm structure of the low-frequency sub-antenna in embodiment 4.
Fig. 16 is a lower view of the radiation arm structure of the low-frequency sub-antenna in embodiment 4.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1
As shown in fig. 1 and fig. 2, the multiband antenna with cross-band scattering suppression function provided in this embodiment includes one low-frequency sub-antenna 202 and four high-frequency sub-antennas 102a to 102d, where the low-frequency sub-antenna 202 is located in the middle of the four high-frequency sub-antennas 102a to 102d, the low-frequency sub-antenna 202 and the four high-frequency sub-antennas 102a to 102d operate in different frequency bands, an operating band of the low-frequency sub-antenna 202 may be 690MHz to 960MHz, and an operating band of the high-frequency sub-antennas 102a to 102d may be 1690MHz to 2690 MHz; the low frequency sub-antenna 202 has four radiating arms 402a-402d, the radiating arms 402a-402d are designed on the dielectric substrate 302, and the four radiating arms 402a-402d of the low frequency sub-antenna 202 have the same physical structure, it being understood that the rotation of the radiating arms 402a-402d in space does not affect the uniformity of the physical structure. As shown in fig. 3, radiating arm 402a is divided into three arm segments 502a-502c, arm segment 502a is electrically connected to arm segment 502b by decoupling structure 602a, arm segment 502b is electrically connected to arm segment 502c by decoupling structure 602b, and decoupling structure 602b has the same physical structure as decoupling structure 602 a. As shown in fig. 4, which is a schematic structural diagram of the decoupling structure 602a, the decoupling structure 602a is composed of a thin metal connection line 702a and metal branches 802a to 802d, the metal branches 802a and 802b are located on the same side of the thin metal connection line 702a, the metal branches 802c and 802d are located on the other side of the thin metal connection line 702a, one end of the thin metal connection line 702a is electrically connected to the arm section 502a, the other end is electrically connected to the arm section 502b, one ends of the metal branches 802a and 802c are electrically connected to the arm section 502a, and the other end is disconnected; one end of the metal bar sections 802b and 802d is electrically connected to the arm section 502b, and the other end is disconnected. The high frequency induced currents on the metal branches 802a-802d can be inversely cancelled with the high frequency induced currents on the thin metal connecting line 702a, and the metal branches 802a-802d and most of the currents on the thin metal connecting line 702a are superposed in the same direction at a low frequency band, in short, the decoupling structure can inversely cancel the currents of the specific frequency band induced thereon, and has no obvious blocking, inhibiting or cancelling effect on the currents of other frequency bands.
As shown in fig. 5, the curve with an open circle is a horizontal plane half-power beam width curve of the high-frequency sub-antenna in the conventional multiband antenna, and the curve with a solid circle is a horizontal plane half-power beam width curve of the high-frequency sub-antenna in the multiband antenna according to the present embodiment. In contrast to conventional multiband antennas, each radiating arm of the low-frequency sub-antenna of the present embodiment is divided into several arm sections and connected by decoupling structures. In a high frequency band (such as 1700MHz to 2700MHz), the horizontal plane beam width of the high frequency sub-antenna of the conventional multiband antenna fluctuates sharply (the beam width sharply increases around 2.15GHz, and narrows as a whole in the frequency band range of 2.3GHz to 2.7 GHz); in contrast, the high-frequency sub-antenna of the multiband antenna according to the present embodiment tends to have a flat fluctuation of the horizontal plane half-power beam profile in a high-frequency band (e.g., 1700MHz to 2700 MHz).
Fig. 6 shows a horizontal normalized radiation pattern of a high-frequency sub-antenna of a conventional multiband antenna, and fig. 7 shows a horizontal normalized radiation pattern of a high-frequency sub-antenna of the multiband antenna according to the present embodiment. For clarity of illustration, only the radiation aspect of the individual frequency points in the multi-band antenna where cross-band scattering interference is significant is shown. It can be seen that the horizontal plane normalized radiation pattern of the high frequency sub-antenna of the conventional multiband antenna is significantly distorted, mainly manifested as a depression of the radiation pattern and a deviation of the maximum radiation direction of the radiation pattern from the axial direction. In contrast, the horizontal-plane normalized radiation pattern of the high-frequency sub-antenna of the multiband antenna according to the present embodiment is more stable (the radiation pattern is not significantly depressed, and the maximum radiation direction of the pattern is not significantly off-axis). Therefore, the multi-band antenna provided by the invention can obviously inhibit cross-band scattering interference and obtain a stable high-frequency radiation pattern.
Example 2
As shown in fig. 8, the multiband antenna with cross-band scattering suppression function provided in this embodiment includes a low-frequency sub-antenna 203 and four high-frequency sub-antennas 103a to 103d, where the low-frequency sub-antenna 203 is located in the middle of the four high-frequency sub-antennas 103a to 103d, the low-frequency sub-antenna 203 and the four high-frequency sub-antennas 103a to 103d operate in different frequency bands, and the four radiation arms 403a to 403d of the low-frequency sub-antenna 203 have the same physical structure, and it should be understood that the spatial rotation of the radiation arms 403a to 403d does not affect the consistency of the physical structure. As shown in fig. 9, radiating arm 403a is divided into three arm segments 503a-503c, arm segment 503a is electrically connected to arm segment 503b through decoupling structure 603a, arm segment 503b is electrically connected to arm segment 503c through decoupling structure 603b, and decoupling structure 603b has the same physical structure as decoupling structure 603 a. As shown in fig. 10, which is a schematic structural diagram of the decoupling structure 603a, the decoupling structure 603a is composed of a thin metal connection line 703a and metal branches 803a and 803b, the metal branches 803a and 803b are located at two sides of the thin metal connection line 703a, one end of the thin metal connection line 703a is electrically connected to the arm section 503a, the other end is electrically connected to the arm section 503b, the same end of the metal branches 803a and 803b is electrically connected to the arm section 503a, and the other end is disconnected. The high-frequency induced current on the metal branches 803a, 803b can be reversely cancelled out by the high-frequency induced current on the thin metal connecting wire 703a, and the metal branches 803a, 803b and most of the current on the thin metal connecting wire 703a are superposed in the same direction at a low frequency band.
Example 3
As shown in fig. 11, the multiband antenna with cross-band scattering suppression function provided in this embodiment includes one low-frequency sub-antenna 204 and four high-frequency sub-antennas 104a to 104d, where the low-frequency sub-antenna 204 is located in the middle of the four high-frequency sub-antennas 104a to 104d, the low-frequency sub-antenna 204 and the four high-frequency sub-antennas 104a to 104d operate in different frequency bands, and the four radiating arms 404a to 404d of the low-frequency sub-antenna 204 have the same physical structure. It should be appreciated that rotation of the radiating arms 404a-404d in space does not affect their consistency in physical structure. As shown in fig. 12, the radiating arm 404a is divided into three arm segments 504a-504c, the arm segment 504a being electrically connected to the arm segment 504b by a decoupling structure 604a, and the arm segment 504b being electrically connected to the arm segment 504c by a decoupling structure 604 b. The decoupling structure 604b has the same physical structure as the decoupling structure 604 a. As shown in fig. 13, a schematic diagram of a decoupling structure 604a is shown. The decoupling structure 604a is composed of a thin metal connection line 704a and metal branches 804a, 804b, the metal branches 804a, 804b are located at both sides of the thin metal connection line 704a, one end of the thin metal connection line 704a is electrically connected with the arm section 504a, the other end is electrically connected with the arm section 504b, one ends of the metal branches 804a and 804b are electrically connected with the arm section 504b, and the other ends are disconnected. The high-frequency induced current on the metal branches 804a and 804b can be reversely cancelled by the high-frequency induced current on the thin metal connecting wire 704a, and the metal branches 804a and 804b and most of the current on the thin metal connecting wire 704a are superposed in the same direction in a low frequency band, in short, the decoupling structure can reversely cancel the current of a specific frequency band induced on the metal branches 804a and 804b, and has no obvious blocking, inhibiting or cancelling effect on the current of other frequency bands.
Example 4
As shown in fig. 14, the multiband antenna with cross-band scattering suppression function provided in this embodiment includes a low-frequency sub-antenna 205 and four high-frequency sub-antennas 105a to 105d, the low-frequency sub-antenna 205 is located in the middle of the four high-frequency sub-antennas 105a to 105d, the low-frequency sub-antenna 205 and the four high-frequency sub-antennas 105a to 105d operate in different frequency bands, fig. 15 and 16 show one of the radiation arms of the low-frequency sub-antenna 205 in this embodiment, where fig. 15 shows an upper view of the radiation arm, and fig. 16 shows a lower view of the radiation arm. The radiating arm is divided into three arm sections 505a-505c, the arm section 505a is electrically connected with the arm section 505b through a decoupling structure, the decoupling structure is composed of a thin metal connecting line 605a and a metal branch 705a, the arm section 505b is electrically connected with the arm section 505c through a decoupling structure, the decoupling structure is composed of a thin metal connecting line 605b and a metal branch 705b, the arm sections 505a-505c and the thin metal connecting lines 605a and 605b are designed on the upper surface of the dielectric substrate 305, and the metal branches 705a and 705b are designed on the lower surface of the dielectric substrate 305; one end of the thin metal connection line 605a is electrically connected to the arm section 505a, and the other end thereof is electrically connected to the arm section 505 b; one end of the thin metal connection line 605b is electrically connected to the arm section 505b, and the other end thereof is electrically connected to the arm section 505 c; one end of the metal branch 705a is electrically connected to the arm section 505a through the metallized hole 805a, and the other end thereof is disconnected; one end of the metal branch 705b is electrically connected to the arm section 505b through a metallized hole 805b, and the other end is disconnected. The high frequency induced currents on the metal stubs 705a, 705b can be inversely cancelled by the high frequency induced currents on the thin metal connection lines 605a, 605b, and the metal stubs 705a, 705b are superposed with most of the currents on the thin metal connection lines 605a, 605b in the same direction in the low frequency band.
Of course, besides the four embodiments, the decoupling structure of the multiband antenna according to the present invention may also have various forms, for example, the metal branches may be distributed on only one side of the thin metal connecting line, and may also be located above or below the thin metal connecting line, or above and below the thin metal connecting line, which is not illustrated herein. Furthermore, the number of decoupling structures on different radiating arms may be the same or different, and the physical dimensions of the different decoupling structures may be the same or different. In addition, in the above four embodiments, the radiation arms are printed on the dielectric substrate, and in fact, the radiation arms may also exist in the form of metal castings.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that the changes in the shape and principle of the present invention should be covered within the protection scope of the present invention.
Claims (6)
1. A multiband antenna having cross-band dispersion suppression, characterized in that: comprises at least one low-frequency sub-antenna and at least one high-frequency sub-antenna; the low-frequency sub-antenna and the high-frequency sub-antenna work in different frequency bands, the low-frequency sub-antenna comprises at least one radiation arm, the radiation arm is divided into a plurality of arm sections in the arm length direction, every two adjacent arm sections are connected through a decoupling structure, the decoupling structure is composed of a thin metal connecting line and at least one metal branch, the metal branch is connected with the thin metal connecting line, two ends of the thin metal connecting line are electrically connected with the two arm sections respectively, one end of the metal branch is electrically connected with the corresponding arm section, and the other end of the metal branch is disconnected, so that high-frequency induced current on the metal branch can be reversely offset with high-frequency induced current on the thin metal connecting line, and scattering interference of the low-frequency sub-antenna on the high-frequency sub-antenna is suppressed.
2. A multiband antenna having a cross-band scattering suppression function according to claim 1, characterized in that: the metal branch knots and the thin metal connecting wire are positioned on the same horizontal plane, and the metal branch knots are distributed on one side of the thin metal connecting wire.
3. A multiband antenna having a cross-band scattering suppression function according to claim 1, characterized in that: the metal branches and the thin metal connecting wires are located on the same horizontal plane, and the metal branches are distributed on two sides of the thin metal connecting wires.
4. A multiband antenna having a cross-band scattering suppression function according to claim 1, characterized in that: the metal branch knot is positioned above or below the thin metal connecting line, or above and below the thin metal connecting line.
5. A multiband antenna having a cross-band scattering suppression function according to claim 1, characterized in that: the radiating arms are printed on a dielectric substrate or are in the form of a metal casting.
6. A multiband antenna having a cross-band scattering suppression function according to claim 1, characterized in that: the working frequency band of the low-frequency sub-antenna is 690MHz to 960MHz, and the working frequency band of the high-frequency sub-antenna is 1690MHz to 2690 MHz.
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| CN113937465A (en) * | 2021-10-25 | 2022-01-14 | 华南理工大学 | Dual-polarized electromagnetic transparent antenna and method for realizing dual-frequency scattering suppression |
| CN113964506A (en) * | 2021-09-17 | 2022-01-21 | 华南理工大学 | Dual-polarized electromagnetic stealth antenna for pilot frequency decoupling |
| CN113964490A (en) * | 2021-09-17 | 2022-01-21 | 华南理工大学 | Broadband dual-polarization electromagnetic transparent antenna |
| WO2022062241A1 (en) * | 2020-09-25 | 2022-03-31 | 京信通信技术(广州)有限公司 | Antenna, low-frequency radiation unit, and radiation arm |
| EP4075590A1 (en) * | 2021-04-13 | 2022-10-19 | CommScope Technologies LLC | Radiating element and multi-band base station antenna |
| WO2023274173A1 (en) * | 2021-07-02 | 2023-01-05 | 华为技术有限公司 | Antenna structure, base station antenna, and base station |
| EP4252315A4 (en) * | 2020-11-27 | 2024-08-07 | Rfs Tech Inc | Decoupling apparatus, a radiation unit and antenna |
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| CN113964506A (en) * | 2021-09-17 | 2022-01-21 | 华南理工大学 | Dual-polarized electromagnetic stealth antenna for pilot frequency decoupling |
| CN113964490A (en) * | 2021-09-17 | 2022-01-21 | 华南理工大学 | Broadband dual-polarization electromagnetic transparent antenna |
| CN113964490B (en) * | 2021-09-17 | 2022-10-25 | 华南理工大学 | Broadband dual-polarization electromagnetic transparent antenna |
| CN113937465A (en) * | 2021-10-25 | 2022-01-14 | 华南理工大学 | Dual-polarized electromagnetic transparent antenna and method for realizing dual-frequency scattering suppression |
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