CN111786112A - A multi-band antenna with cross-band scattering suppression - Google Patents

Abstract

The invention discloses a multi-band antenna with cross-band scattering suppression function, comprising 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, and the low-frequency sub-antenna includes At least one radiation arm, the radiation arm is divided into several arm sections in the direction of the arm length, and two adjacent arm sections are connected by a decoupling structure, and the decoupling structure is connected by a thin metal The wire is composed of at least one metal branch, the metal branch is connected with a thin metal connecting wire, the two ends of the thin metal connecting wire are respectively electrically connected with the two arm sections, and one end of the metal branch is connected with the corresponding arm section The other end of the electrical connection is disconnected, so that the high-frequency induced current on the metal branch can be counteracted with the high-frequency induced current on the thin metal connecting line, so as to suppress the scattering interference of the low-frequency sub-antenna to the high-frequency sub-antenna. Obtain a stable high frequency radiation pattern.

Description

A multi-band antenna with cross-band scattering suppression

technical field

The present invention relates to the technical field of wireless communication, in particular to a multi-band antenna with cross-band scattering suppression function.

Background technique

It is known in the industry that a multi-band antenna can effectively improve the space utilization rate of the antenna while providing more diversified services, and reduce the cost of antenna equipment and site rental. Therefore, multi-band antennas have become an important research direction in the field of new-generation wireless communications. A multi-band antenna is usually composed 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 there will be strong cross-band scattering interference between different sub-antennas. This will seriously deteriorate the performance of the multi-band antenna, which is manifested in the deterioration of port isolation between sub-antennas in different frequency bands, and the distortion of the radiation pattern of the high-frequency sub-antennas, which will adversely affect user experience.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and proposes a multi-band antenna with cross-band scattering suppression function, which can effectively suppress the scattering interference of the low-frequency sub-antenna to the high-frequency sub-antenna and obtain stable high-frequency radiation. Orientation map.

In order to achieve the above object, the technical solution provided by the present invention is: a multi-band antenna with cross-band scattering suppression function, comprising at least one low-frequency sub-antenna and at least one high-frequency sub-antenna; wherein, the low-frequency sub-antenna and the high-frequency sub-antenna The frequency sub-antenna works in different frequency bands, the low-frequency sub-antenna includes at least one radiating arm, the radiating arm is divided into several arm segments in the direction of its arm length, and two adjacent arm segments pass through connected by 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, and the two ends of the thin metal connecting line are respectively connected with the two arms The segments are electrically connected, one end of the metal branch is electrically connected to the corresponding arm segment, and the other end is disconnected, so that the high-frequency induced current on the metal branch can be counteracted with the high-frequency induced current on the thin metal connecting line , so as to suppress the scattering interference of the low-frequency sub-antenna to the high-frequency sub-antenna.

Further, the metal branches and the thin metal connecting wires are at the same level, and the metal branches are distributed on one side of the thin metal connecting wires.

Further, the metal branches and the thin metal connecting lines are on the same level, and the metal branches are distributed on both sides of the thin metal connecting lines.

Further, the metal branch is located above or below the thin metal connecting line, or above and below.

Further, the radiating arms are printed on a dielectric substrate or exist in the form of metal castings.

Further, 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 2690MHz.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. Compared with the existing multi-band antenna, the low-frequency sub-antenna of the antenna of the present invention is designed with a decoupling structure, which uses the decoupling structure to reverse the high-frequency induced current on the low-frequency sub-antenna, thereby suppressing the low-frequency sub-antenna. The scattering interference of the antenna to the high-frequency sub-antenna realizes the shape preservation of the radiation pattern of the high-frequency sub-antenna.

2. Compared with the existing multi-band antenna, the decoupling structure designed in the antenna of the present invention has a wider decoupling bandwidth, and has a good scattering suppression effect in the frequency band of 1690MHz to 2690MHz.

3. Compared with the existing multi-band antenna, the decoupling structure designed in the antenna of the present invention is electrically connected to the radiating arm of the low-frequency sub-antenna, so it can be designed in the form of a metal casting, thereby reducing the time required for mass production. the cost of.

4. Compared with the existing multi-band antenna, the low frequency sub-antenna of the antenna of the present invention is designed with a decoupling structure, which can minimize the scattering interference of the frequency sub-antenna to the high-frequency sub-antenna. Therefore, the antenna of the present invention does not need to add an additional metal baffle or a director for the high-frequency sub-antenna to achieve high-frequency radiation pattern conformity, which can greatly reduce the difficulty of product development, assembly, and debugging, and can maximize the To ensure the consistency of product performance.

Description of drawings

FIG. 1 is a top view of the multi-band antenna in Embodiment 1. FIG.

FIG. 2 is a perspective view of the multi-band antenna in Embodiment 1. FIG.

FIG. 3 is a schematic diagram of the structure of the radiation arm of the low-frequency sub-antenna in the first embodiment.

FIG. 4 is a schematic diagram of the decoupling structure in Embodiment 1. FIG.

FIG. 5 is a horizontal plane beam width graph of the high-frequency sub-antenna of the multi-band antenna described in Embodiment 1 and the high-frequency sub-antenna of the conventional multi-band 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 multi-band antenna described in Embodiment 1. FIG.

FIG. 8 is a top view of the multi-band antenna in Embodiment 2. FIG.

FIG. 9 is a schematic diagram of the structure of the radiation arm of the low-frequency sub-antenna in the second embodiment.

FIG. 10 is a schematic diagram of the decoupling structure in Embodiment 2. FIG.

FIG. 11 is a top view of the multi-band antenna in Embodiment 3. FIG.

12 is a schematic diagram of the structure of the radiation arm of the low-frequency sub-antenna in the third embodiment.

FIG. 13 is a schematic diagram of the decoupling structure in Embodiment 3. FIG.

FIG. 14 is a top view of the multi-band antenna in Embodiment 4. FIG.

FIG. 15 is a top view of the radiating arm structure of the low-frequency sub-antenna in the fourth embodiment.

FIG. 16 is a bottom view of the radiating arm structure of the low-frequency sub-antenna in the fourth embodiment.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments.

Example 1

As shown in FIG. 1 and FIG. 2 , the multi-band 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-102d, and the low-frequency sub-antenna 202 is located in four In the middle of the high-frequency sub-antennas 102a-102d, the low-frequency sub-antenna 202 and the four high-frequency sub-antennas 102a-102d operate in different frequency bands. The working frequency band of -102d can be 1690MHz to 2690MHz; the low frequency sub-antenna 202 has four radiating arms 402a-402d, the radiation 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 For the same physical structure, it should be understood that the rotation of the radiation arms 402a-402d in space does not affect their consistency in physical structure. As shown in FIG. 3 , the radiating arm 402a is divided into three arm segments 502a-502c, the arm segment 502a and the arm segment 502b are electrically connected by the decoupling structure 602a, and the arm segment 502b and the arm segment 502c are electrically connected by decoupling Structure 602b is electrically connected, and decoupling structure 602b has the same physical structure as decoupling structure 602a. As shown in FIG. 4, which is a schematic diagram of the structure of the decoupling structure 602a, the decoupling structure 602a is composed of a thin metal connection line 702a and metal branches 802a-802d. The metal branches 802a and 802b are located on the same side of the thin metal connection line 702a. 802c, 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 segment 502a, the other end is electrically connected to the arm segment 502b, and one end of the metal branches 802a and 802c is electrically connected to the arm segment 502a is electrically connected, and the other end is disconnected; one end of the metal stubs 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 counter-cancelled with the high frequency induced currents on the thin metal connection line 702a, and most of the currents on the metal branches 802a-802d and the thin metal connection line 702a are at low frequency Superposition in the same direction, in a word, the decoupling structure can make the currents of a specific frequency band induced thereon to be counteracted in the opposite direction, and there is no obvious obstruction, suppression, or cancellation effect on the currents of other frequency bands.

As shown in FIG. 5 , the curve with the hollow circle is the horizontal half-power beam width curve of the high-frequency sub-antenna in the conventional multi-band antenna, and the curve with the solid circle is the horizontal half-power curve of the high-frequency sub-antenna in the multi-band antenna of this embodiment. Power beamwidth curve. Compared with the traditional multi-band antenna, each radiating arm of the low-frequency sub-antenna of this embodiment is divided into several arm sections and connected by a decoupling structure. In the high frequency band (such as 1700MHz to 2700MHz), the horizontal plane beamwidth of the high frequency sub-antenna of the traditional multi-band antenna fluctuates greatly (the beamwidth increases sharply around 2.15GHz, and narrows overall in the 2.3GHz to 2.7GHz frequency band) In contrast, the fluctuation of the horizontal plane half-power beam curve of the high frequency sub-antenna of the multi-band antenna described in this embodiment tends to be gentle in the high frequency band (eg, 1700MHz to 2700MHz).

FIG. 6 shows the horizontal normalized radiation pattern of the high frequency sub-antenna of the conventional multi-band antenna, and FIG. 7 shows the horizontal normalized radiation pattern of the high frequency sub-antenna in the multi-band antenna according to the present embodiment. In order to show the details more clearly, only the radiation aspect diagram of the individual frequency points where the cross-band scattering interference is more serious in the multi-band antenna is given here. It can be seen that the normalized radiation pattern of the horizontal plane of the high frequency sub-antenna of the traditional multi-band antenna is obviously distorted, which is mainly manifested in the depression of the radiation pattern and the deviation of the maximum radiation direction of the radiation pattern from the axial direction. In contrast, the horizontal normalized radiation pattern of the high-frequency sub-antenna of the multi-band antenna described in this embodiment is more stable (the radiation pattern has no obvious depression, and the maximum radiation direction of the pattern does not deviate significantly from the axial direction) . Therefore, the multi-band antenna provided by the present invention can significantly suppress the cross-band scattering interference, and obtain a stable high-frequency radiation pattern.

Example 2

As shown in FIG. 8 , the multi-band antenna with cross-band scattering suppression function provided by this embodiment includes one low-frequency sub-antenna 203 and four high-frequency sub-antennas 103a-103d, and the low-frequency sub-antenna 203 is located in the four high-frequency sub-antennas In the middle of the sub-antennas 103a-103d, the low-frequency sub-antenna 203 and the four high-frequency sub-antennas 103a-103d operate in different frequency bands, and the four radiating arms 403a-403d of the low-frequency sub-antenna 203 have the same physical structure, which needs to be understood Yes, the rotation of the radiating arms 403a-403d in space does not affect their uniformity in physical structure. As shown in FIG. 9 , the radiation arm 403a is divided into three arm segments 503a-503c, the arm segment 503a and the arm segment 503b are electrically connected by the decoupling structure 603a, and the arm segment 503b and the arm segment 503c are electrically connected by decoupling Structure 603b is electrically connected, and decoupling structure 603b has the same physical structure as decoupling structure 603a. 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 connecting line 703a and metal branches 803a and 803b. The metal branches 803a and 803b are located on both sides of the thin metal connecting line 703a. One end of the connecting wire 703a is electrically connected to the arm segment 503a, the other end is electrically connected to the arm segment 503b, the same end of the metal stubs 803a, 803b is electrically connected to the arm segment 503a, and the other end is disconnected. The high-frequency induced currents on the metal branches 803a, 803b can cancel the high-frequency induced current on the thin metal connecting line 703a, and most of the currents on the metal branches 803a, 803b and the thin metal connecting line 703a are at low frequency Superposition in the same direction, in a word, the decoupling structure can make the currents of a specific frequency band induced thereon to be counteracted in the opposite direction, and there is no obvious obstruction, suppression, or cancellation effect on the currents of other frequency bands.

Example 3

As shown in FIG. 11 , the multi-band 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-104d, and the low-frequency sub-antenna 204 is located in the four high-frequency sub-antennas In the middle of the sub-antennas 104a-104d, the low-frequency sub-antenna 204 and the four high-frequency sub-antennas 104a-104d operate in different frequency bands, and the four radiating arms 404a-404d of the low-frequency sub-antenna 204 have the same physical structure. It should be understood that the rotation of the radiation arms 404a-404d in space does not affect their physical conformation. As shown in FIG. 12 , the radiating arm 404a is divided into three arm segments 504a-504c, the arm segment 504a and the arm segment 504b are electrically connected by the decoupling structure 604a, and the arm segment 504b and the arm segment 504c are electrically connected by decoupling Structure 604b is electrically connected. Decoupling structure 604b has the same physical structure as decoupling structure 604a. As shown in FIG. 13, it is a schematic structural diagram of the decoupling structure 604a. The decoupling structure 604a is composed of a thin metal connection line 704a and metal branches 804a and 804b. The metal branches 804a and 804b are located on both sides of the thin metal connection line 704a. One end of the thin metal connection line 704a is electrically connected to the arm section 504a, and the other end is electrically connected Electrically connected to the arm segment 504b, one end of the metal branches 804a and 804b is electrically connected to the arm segment 504b and the other end is disconnected. The high-frequency induced currents on the metal branches 804a, 804b can be inversely canceled with the high-frequency induced currents on the thin metal connection line 704a, and most of the currents on the metal branches 804a, 804b and the thin metal connection line 704a are at low frequency Superposition in the same direction, in a word, the decoupling structure can make the currents of a specific frequency band induced thereon to be counteracted in the opposite direction, and there is no obvious obstruction, suppression, or cancellation effect on the currents of other frequency bands.

Example 4

As shown in FIG. 14 , the multi-band antenna with cross-band scattering suppression function provided by this embodiment includes one low-frequency sub-antenna 205 and four high-frequency sub-antennas 105a-105d, and the low-frequency sub-antenna 205 is located in the four high-frequency sub-antennas In the middle of the sub-antennas 105a-105d, the low-frequency sub-antenna 205 and the four high-frequency sub-antennas 105a-105d work in different frequency bands. Figures 15 and 16 show one of the radiation arms of the low-frequency sub-antenna 205 in this embodiment. , wherein Figure 15 shows the top view of the radiation arm, and Figure 16 shows the bottom view of the radiation arm. The radiating arm is divided into three arm sections 505a-505c, the arm section 505a and the arm section 505b are electrically connected by a decoupling structure, the decoupling structure is composed of a thin metal connection line 605a and a metal branch 705a, the arm section The segment 505b is electrically connected to the arm segment 505c by a decoupling structure consisting of a thin metal connection line 605b and a metal branch 705b, the arm segments 505a-505c and the thin metal connection lines 605a, 605b are designed in a dielectric Metal branches 705a and 705b are designed on the upper surface of the substrate 305 and the lower surface of the dielectric substrate 305; one end of the thin metal connection line 605a is electrically connected to the arm segment 505a, and the other end is electrically connected to the arm segment 505b; the One end of the thin metal connecting wire 605b is electrically connected to the arm segment 505b, and the other end thereof is electrically connected to the arm segment 505c; one end of the metal branch 705a is electrically connected to the arm segment 505a through the metallized hole 805a, and the other end is broken open; one end of the metal branch 705b is electrically connected to the arm segment 505b through the metallized hole 805b, and the other end thereof is disconnected. The high-frequency induced currents on the metal branches 705a, 705b can be reversely cancelled with the high-frequency induced currents on the thin metal connecting lines 605a, 605b, and the metal branches 705a, 705b and the thin metal connecting lines 605a, 605b at low frequency Most of the currents are superimposed in the same direction. In a word, the decoupling structure can make the currents of a specific frequency band induced on it reversely cancel, and there is no obvious obstruction, suppression, or cancellation effect on the currents of other frequency bands.

Of course, in addition to the above four embodiments, the decoupling structure of the multi-band antenna according to the present invention also has various forms. Above or below the metal connecting line, or above and below, will not be illustrated one by one here. In addition, the number of decoupling structures on different radiation arms may be the same or different, and the physical dimensions of different decoupling structures may be the same or different. In addition, in the above four embodiments, the radiation arms are all printed on the dielectric substrate, in fact, the radiation arms can also exist in the form of metal castings.

The above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention. Therefore, any changes made according to the shape and principle of the present invention should be included within the protection scope of the present invention.

Claims (6)

1. A multi-band antenna with cross-band scattering suppression function, characterized in that: it comprises at least one low-frequency sub-antenna and at least one high-frequency sub-antenna; wherein, the low-frequency sub-antenna and the high-frequency sub-antenna work in different frequency bands Inside, the low-frequency sub-antenna includes at least one radiating arm, the radiating arm is divided into several arm sections in the arm length direction, and two adjacent arm sections are connected by a decoupling structure, the The decoupling structure is composed of a thin metal connecting wire and at least one metal branch, the metal branch is connected with the thin metal connecting wire, the two ends of the thin metal connecting wire are respectively electrically connected with the two arm sections, the metal branch One end of the branch is electrically connected to the corresponding arm section, and the other end is disconnected, so that the high-frequency induced current on the metal branch can be counteracted with the high-frequency induced current on the thin metal connecting line, so as to suppress the low-frequency sub-antenna pair. Scattering interference from high frequency sub-antennas. 2 . The multi-band antenna with cross-band scattering suppression function according to claim 1 , wherein the metal branches and the thin metal connecting wires are in the same horizontal plane, and the metal branches are distributed on the thin metal connecting wires. 3 . side. 3 . The multi-band antenna with cross-band scattering suppression function according to claim 1 , wherein the metal branches and the thin metal connecting lines are on the same level, and the metal branches are distributed on the thin metal connecting lines 3 . on both sides. 4 . The multi-band antenna with cross-band scattering suppression function according to claim 1 , wherein the metal branch is located above or below the thin metal connecting line, or above and below. 5 . 5 . The multi-band antenna with cross-band scattering suppression function according to claim 1 , wherein the radiation arms are printed on a dielectric substrate or exist in the form of metal castings. 6 . 6 . The multi-band antenna with cross-band scattering suppression function according to claim 1 , wherein 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. 7 . to 2690MHz.

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