Multi-frequency antenna

Abstract

The invention provides a multi-frequency antenna. The multi-frequency antenna comprises a plurality of main radiation units and a plurality of auxiliary radiation units, the main radiation units are arranged on the bottom plate in an array mode, and the auxiliary radiation units are arranged between the main radiation units at intervals. Each auxiliary radiation unit comprises a dielectric substrate, a radiation line and a Balun plate; the dielectric substrate is recessed to form a slot and a plurality of notches symmetrically arranged about the slot, and the radiation lines are fixedly arranged between the notches; and one end of the balun plate is embedded into the slot, and the other end of the balun plate is connected with the feeder line. According to the invention, the auxiliary radiation units are nested between the main radiation units, and each gap is segmented by the radiation line, so that the influence of the main radiation units on the auxiliary radiation units is improved, and a multi-band radiation array is constructed.

Description

Technical Field

[0001] The present invention belongs to the technical field of base station antennas, and in particular relates to a multi-frequency antenna. Background Art

[0002] With the development of the times, base station antennas are usually required to have different frequency bands in order to cope with various scenarios. However, the size of multi-frequency antennas is often larger than that of single-frequency antennas. On the one hand, this increases the weight of the antenna itself, and on the other hand, the operation of multi-frequency radiation units will also cause mutual interference. How to realize miniaturized multi-frequency antennas is an urgent problem to be solved in the current base station antenna field. Summary of the invention

[0003] In order to solve the problem that the multi-frequency antenna described in the background technology increases the weight of the antenna itself on the one hand, and on the other hand, the operation of the radiation units of the multi-frequency bands will cause mutual interference, the present invention proposes the following technical solution:

[0004] A multi-frequency antenna comprises: a plurality of main radiating units and a plurality of secondary radiating units; the main radiating units are arranged in an array on a bottom plate, and each of the secondary radiating units is arranged between the main radiating units at intervals; each of the secondary radiating units comprises: a dielectric substrate, a radiating line and a balun board; the dielectric substrate is recessed to form a slot and a plurality of notches symmetrically arranged about the slot, and the radiating line is fixedly arranged between each of the notches; one end of the balun board is embedded in the slot, and the other end of the balun board is connected to a feeder.

[0005] The slots divide the surface of the dielectric substrate into a plurality of radiation areas, and each of the radiation areas is provided with a pair of the notches.

[0006] Furthermore, each of the notches is arc-shaped, and each pair of the notches forms a circle in each radiated area.

[0007] Furthermore, the radiation circuit diagram includes multiple first parts and multiple second parts; each of the first parts is distributed along the boundary of the corresponding radiation area, and each of the first parts is symmetrical about the slot; in the same radiation area, each of the first parts is respectively connected to the corresponding second part.

[0008] Furthermore, a microstrip line is provided in the balun board, one end of the microstrip line is electrically connected to the radiation line, and the other end of the radiation line is connected to the feeder line.

[0009] Furthermore, a line width of the first portion is greater than a line width of the second portion.

[0010] Furthermore, the operating frequency of the secondary radiation unit is 690Mhz-960Mhz.

[0011] Furthermore, the total length of the microstrip line is equal to one quarter wavelength of the operating frequency of the main radiation unit.

[0012] Beneficial effect: The present invention designs the secondary radiating units to be nested between the main radiating units, and divides each gap by a radiating line to improve the influence of the main radiating unit on the secondary radiating unit, thereby constructing a multi-band radiating array. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of a distributed structure of a multi-frequency antenna according to an embodiment of the present invention;

[0014] Figure 2 is a schematic structural diagram of a secondary radiation unit according to an embodiment of the present invention, wherein the balun board is not shown;

[0015] Figure 3 Schematic diagram of the structure of a balun board according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present application clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0018] Figure 1 The figure is a schematic diagram of a distributed structure of a multi-frequency antenna according to an embodiment of the present invention. Figure 2 Schematic diagram of the structure of a secondary radiation unit according to an embodiment of the present invention.

[0019] Reference Figure 1 According to an embodiment of the present invention, a multi-frequency antenna comprises: a plurality of main radiating units 1 and a plurality of secondary radiating units 2. Each main radiating unit 1 is arranged in an array on a bottom plate 3 to achieve signal radiation of the antenna as a whole in a specific direction and enhance the signal transmission and reception capabilities. Each secondary radiating unit 2 is arranged between the main radiating units 1 at intervals, and the secondary radiating units 2 cooperate with the main radiating units 1 to jointly optimize the radiation performance of the multi-frequency antenna.

[0020] Figure 2 Schematic diagram of the structure of a secondary radiation unit according to an embodiment of the present invention, wherein the balun board 23 is not shown.

[0021] Reference Figure 2 Each secondary radiation unit 2 includes: a dielectric substrate 21, a radiation line 22, and a balun board 23. The surface of the dielectric substrate 21 is recessed to form a slot 211 and a plurality of notches 212 symmetrically arranged about the slot 211. The radiation line 22 is fixedly arranged between each notch 212 to ensure that it maintains a stable position and state during the operation of the antenna. The balun board 23 is used for signal transmission and conversion, wherein one end of the balun board 23 is embedded in the slot 211, and the other end of the balun board 23 is connected to the feeder, thereby constructing a complete signal transmission path from the feeder to the radiation line 22.

[0022] Specifically, the presence of the slot 211 divides the surface of the dielectric substrate 21 into a plurality of radiation areas, each of which is provided with a pair of notches 212. Each notch 212 is arc-shaped, and each pair of notches 212 can form a quasi-circular shape in each radiation area. This unique shape design helps to optimize the signal radiation characteristics of the radiation line 22 in the secondary radiation unit 2, thereby improving the influence of the coupling effect between the main radiation unit 1 and the secondary radiation unit 2, and thus improving the radiation efficiency of the antenna.

[0023] Specifically, the radiation line 22 includes: a plurality of first parts 221 and a plurality of second parts 222. Each first part 221 is distributed along the boundary of the corresponding radiation area, and each first part 221 is symmetrical about the slot 211. In the same radiation area, each first part 221 is respectively connected to the corresponding second part 222 to form a complete radiation line 22 structure. Furthermore, the operating frequency of the entire secondary radiation unit 2 is 690Mhz-960Mhz.

[0024] Figure 3 Schematic diagram of the structure of a balun board according to an embodiment of the present invention.

[0025] Reference Figure 3 Furthermore, a microstrip line 5 is provided inside the balun board 23, and one end of the microstrip line 5 is electrically connected to the radiation line 22 to ensure that the signal can be smoothly transmitted from the radiation line 22 to the microstrip line 5, and the other end of the microstrip line 5 is connected to the feeder to achieve signal reception and transmission. Among them, the line width of the first part 221 is greater than the line width of the second part 222, and the total length of the microstrip line 5 is equal to a quarter wavelength of the operating frequency of the main radiation unit 1, thereby reducing the coupling between the main radiation unit 1 and the secondary radiation unit 2, and then enabling the microstrip line 5 to achieve the best signal transmission and matching effect at a specific frequency, so as to further improve the performance of the multi-frequency antenna in different frequency bands and ensure that it can work stably and efficiently.

[0026] In summary, the present invention designs the secondary radiating units to be nested between the main radiating units, and divides each gap by a radiating line to improve the influence of the main radiating unit on the secondary radiating unit, thereby constructing a multi-band radiating array.

[0027] The foregoing describes certain embodiments of the invention. Other embodiments are within the scope of the following claims.

[0028] The terms "exemplary," "example," and the like used throughout this specification mean "used as an example, instance, or illustration" and do not mean "preferred" or "advantageous" over other embodiments. The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques can be implemented without these specific details. In some instances, in order to avoid obscuring the concepts of the described embodiments, well-known structures and devices are shown in block diagram form.

[0029] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0030] The above description of the contents of this specification is provided to enable any person of ordinary skill in the art to implement or use the contents of this specification. Various modifications to the contents of this specification will be apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of protection of the contents of this specification. Therefore, the contents of this specification are not limited to the examples and designs described herein, but are consistent with the widest range of principles and novel features disclosed herein.

Claims

1. A multi-frequency antenna, characterized in that: include: A plurality of main radiation units (1) and a plurality of secondary radiation units (2); The main radiation units (1) are arranged in an array on a bottom plate (3), and each of the secondary radiation units (2) is arranged at intervals between the main radiation units (1); Each of the secondary radiation units (2) comprises: a dielectric substrate (21), a radiation line (22) and a balun board (23); The dielectric substrate (21) is recessed to form a slot (211) and a plurality of notches (212) symmetrically arranged about the slot (211); the radiation line (22) is fixedly arranged between each of the notches (212); one end of the balun board (23) is embedded in the slot (211), and the other end of the balun board (23) is connected to a feeder line.

2. A multi-frequency antenna according to claim 1, characterized in that: The slots (211) divide the surface of the dielectric substrate (21) into a plurality of radiation areas, and each of the radiation areas is provided with a pair of notches (212).

3. A multi-frequency antenna according to claim 2, characterized in that: Each of the notches (212) is arc-shaped, and each pair of the notches (212) forms a circle in each radiated area.

4. A multi-frequency antenna according to claim 3, characterized in that: Therefore, the radiation line (22) diagram includes multiple first parts (221) and multiple second parts (222); each of the first parts (221) is distributed along the boundary of the corresponding radiation area, and each of the first parts (221) is symmetrical about the slot (211); in the same radiation area, each of the first parts (221) is respectively connected to the corresponding second part (222).

5. A multi-frequency antenna according to claim 4, characterized in that: A microstrip line (5) is provided in the balun plate (23), one end of the microstrip line (5) is electrically connected to the radiation line (22), and the other end of the radiation line (22) is connected to the feeder line.

6. A multi-frequency antenna according to claim 4, characterized in that: The line width of the first portion (221) is greater than the line width of the second portion (222).

7. A multi-frequency antenna according to claim 6, characterized in that: The operating frequency of the secondary radiation unit (2) is 690Mhz-960Mhz.

8. A multi-frequency antenna according to claim 7, characterized in that: The total length of the microstrip line (5) is equal to a quarter wavelength of the operating frequency of the main radiation unit (1).

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