Broadband omnidirectional conformal long-slot antenna and wireless communication equipment

Abstract

The invention discloses a broadband omnidirectional conformal long-slot antenna and a wireless communication device, the antenna comprises two antenna units which are arranged up and down, and the two antenna units relatively rotate around the center at an angle of 45 degrees. Each antenna unit comprises an annular metal resonant cavity, a first annular dielectric substrate, a metal ring, a second annular dielectric substrate and a microstrip metal feeder which are sequentially arranged from inside to outside, and a circle of annular long seam is formed in the center of the metal ring. According to the antenna, the slot is used for providing low-frequency resonance points, the microstrip open-circuit line is used for providing high-frequency resonance points, the antenna achieves double working frequency bands, the working bandwidth of the antenna is greatly expanded through the design, the problem that the bandwidth of the antenna is insufficient is solved, the antenna is designed in a circular ring shape, a double-layer directional diagram compensation design method is applied, and the antenna performance is improved. Therefore, the antenna can achieve the omnidirectional radiation performance, and the problem that a traditional cavity-backed slot antenna is difficult to radiate in an omnidirectional manner is solved.

Description

Technical Field

[0001] The invention relates to a broadband omnidirectional conformal long slot antenna and wireless communication equipment, belonging to the technical field of wireless communication. Background Art

[0002] Omnidirectional antennas are widely used in the communications field, including cellular base stations, mobile communications, etc., because of their ability to receive or transmit signals in all directions, providing all-round signal coverage for device terminals. With the rapid development of communication technology, the demand for omnidirectional antennas has increased significantly, and the design of products has developed towards more compactness, large bandwidth, and easy conformality. However, traditional omnidirectional antennas often use microstrip antenna technology, printed circuit board technology and other technologies. Although this improves the performance and reliability of the antenna, its installation and maintenance costs are high in specific scenarios, and it is difficult to conform to the cylindrical shape. These shortcomings limit its application in many fields. To this end, it is necessary to design an omnidirectional antenna that takes into account both broadband and conformality. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a broadband omnidirectional conformal long slot antenna. The circular ring structure adopted by the antenna can be perfectly conformal to the cylindrical shape, so that the radiation pattern can achieve an omnidirectional radiation effect and can produce double resonance, so that the antenna has a larger bandwidth and has the advantages of large bandwidth, omnidirectionality, and easy conformality.

[0004] Another object of the present invention is to provide a wireless communication device including the above antenna.

[0005] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0006] A broadband omnidirectional conformal long slot antenna comprises two antenna units arranged one above the other. The two antenna units are relatively rotated 45 degrees along the center. Each antenna unit comprises a circular metal resonant cavity, a first circular ring-shaped dielectric substrate, a metal ring, a second circular ring-shaped dielectric substrate and a microstrip metal feeder arranged in sequence from the inside to the outside. A circle of circular long slots is opened at the center of the metal ring.

[0007] Furthermore, a ring-shaped cross-section groove is opened at the center of the annular metal resonant cavity, and the first annular dielectric substrate is embedded in the annular cross-section groove.

[0008] Furthermore, the metal ring is placed around the outer surface of the first annular dielectric substrate.

[0009] Furthermore, the microstrip metal feed line is etched on the outer surface of the second annular dielectric substrate.

[0010] Further, one end of the microstrip metal feeder is located at the lower edge of the second circular dielectric substrate as a feeding port, and the other end of the microstrip metal feeder is close to the upper edge of the second circular dielectric substrate.

[0011] Further, the number of microstrip metal feeders for each antenna unit is N, and the N microstrip metal feeders are arranged in a rotational pattern around the center of the second circular dielectric substrate.

[0012] Further, the number of microstrip metal feeders for each antenna unit is four, and the four microstrip metal feeders are arranged in a rotational pattern by 90 degrees around the center of the second circular dielectric substrate.

[0013] Further, there is a gap between two antenna units.

[0014] Further, both the first circular dielectric substrate and the second circular dielectric substrate are formed by conformally bending a planar microwave dielectric board along a circular ring.

[0015] Further, both the first circular dielectric substrate and the second circular dielectric substrate adopt Rogers RT / duroid 5880 material with a dielectric constant of 2.2, or other microwave dielectric board materials with similar dielectric constants.

[0016] Another object of the present invention can be achieved by adopting the following technical solutions:

[0017] A wireless communication device includes the above-mentioned broadband omnidirectional conformal slot antenna.

[0018] The present invention has the following beneficial effects compared with the prior art:

[0019] The antenna of the present invention uses a slot to provide a low-frequency resonance point and a microstrip open circuit line to provide a high-frequency resonance point, enabling the antenna to achieve a dual operating frequency band. This design greatly expands the operating bandwidth of the antenna and overcomes the problem of insufficient antenna bandwidth. The antenna adopts a circular ring design and applies a double-layer radiation pattern compensation design method, enabling the antenna to achieve omnidirectional radiation performance and overcoming the difficulty of omnidirectional radiation of traditional back cavity slot antennas. The antenna can also be perfectly conformal with the cylindrical shape and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0021] Figure 1Schematic diagram of the broadband omnidirectional conformal slot antenna provided by the embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the annular metal resonant cavity structure of the broadband omnidirectional conformal slot antenna provided by the embodiment of the present invention.

[0023] Figure 3 Schematic diagram of the first circular dielectric substrate of the broadband omnidirectional conformal slot antenna provided by the embodiment of the present invention.

[0024] Figure 4 Schematic diagram of the metal ring of the broadband omnidirectional conformal slot antenna provided by the embodiment of the present invention.

[0025] Figure 5 Schematic diagram of the second circular dielectric substrate and the microstrip metal feeder of the broadband omnidirectional conformal slot antenna provided by the embodiment of the present invention.

[0026] Figure 6 Reflection coefficient curve graph of the broadband omnidirectional conformal slot antenna provided by the embodiment of the present invention.

[0027] Figure 7 Radiation pattern in the xoy plane of the broadband omnidirectional conformal slot antenna provided by the embodiment of the present invention.

[0028] Figure 8 Radiation pattern in the xoz plane of the broadband omnidirectional conformal slot antenna provided by the embodiment of the present invention.

[0029] Figure 9 Gain curve graph of the broadband omnidirectional conformal slot antenna provided by the embodiment of the present invention.

[0030] Wherein, 1 - annular metal resonant cavity, 2 - first circular dielectric substrate, 3 - metal ring, 4 - second circular dielectric substrate, 5 - microstrip metal feeder, 6 - annular slot, 7 - feeding port. Specific embodiments

[0031] For the convenience of clearly describing the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and effects. For example, the first threshold and the second threshold are only used to distinguish different thresholds, and do not limit their sequence. Those skilled in the art can understand that the terms "first" and "second" do not limit the quantity and execution order, and the terms "first" and "second" do not necessarily limit being different.

[0032] It should be noted that in the embodiments of the present invention, words such as "for example" are used to give examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the present invention should not be construed as being more preferred or having more advantages than other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0033] In the embodiments of the present invention, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b, and c can represent: a, b, c, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b, and c, where a, b, and c can be single or multiple.

[0034] Embodiment:

[0035] As Figure 1 shown, this embodiment provides a broadband omnidirectional conformal slot antenna, which can be applied to various wireless communication devices. It includes two antenna units arranged up and down, with a certain interval between the two antenna units, and they are relatively rotated by 45 degrees along the center, so that the overall radiation pattern of the antenna presents an omnidirectional effect, realizing horizontal omnidirectional radiation performance. Each antenna unit includes a circular metal resonator 1, a first circular dielectric substrate 2, a metal ring 3, a second circular dielectric substrate 4, and a microstrip metal feeder 5 arranged in sequence from inside to outside.

[0036] As Figures 1 to 3 shown, an annular cross-section groove is opened at the center of the circular metal resonator 1, and the first circular dielectric substrate 2 is embedded in the annular cross-section groove.

[0037] As Figures 1 to 4 shown, the metal ring 3 is placed around the outer surface of the first circular dielectric substrate 4, and an annular slot 6 is opened at the center position of the metal ring 3. The annular slot 6 provides a low-frequency resonance point for the antenna.

[0038] As Figures 1 to 5 shown, the microstrip metal feeder 5 is etched on the outer surface of the second circular dielectric substrate 4. The microstrip metal feeder 5 is used to feed the antenna and provide a high-frequency resonance point for the antenna.

[0039] Furthermore, there are N microstrip metal feeders 5 for each antenna element. The N microstrip metal feeders 5 are arranged in a rotational pattern around the center of the second circular dielectric substrate 4. In this embodiment, N = 4 is selected, that is, there are a total of eight microstrip metal feeders 5. The four microstrip metal feeders 5 of each antenna element are arranged in a 90-degree rotation around the center of the second circular dielectric substrate 4. For each microstrip metal feeder 5, one end is located at the lower edge of the second circular dielectric substrate 4 and serves as the feeding port 7, and the other end is close to the upper edge of the second circular dielectric substrate 4. That is, the antenna in this embodiment has a total of eight feeding ports.

[0040] In this embodiment, both the first circular dielectric substrate 2 and the second circular dielectric substrate 4 can be formed by conformally bending a planar microwave dielectric plate along a circular ring. The planar microwave dielectric plate can use Rogers RT / duroid5880 material with a dielectric constant of 2.2. By enlarging or reducing the antenna size, the operating frequency band can be adjusted so that the antenna operates in the microwave, millimeter-wave, or terahertz frequency band. The antenna adopts a circular ring design and applies a double-layer pattern compensation design method, enabling the antenna to achieve omnidirectional radiation performance and can also be perfectly conformal with the cylindrical shape.

[0041] As Figure 6 shown, it is the reflection coefficient curve graph of the broadband omnidirectional conformal slotted antenna of this embodiment. The reflection coefficients of each port can be seen. All eight ports operate in the range of 3.5 - 5.3 GHz, and it has the characteristic of broadband. As Figure 7 shown, it is the radiation pattern in the xoy plane of the broadband omnidirectional conformal slotted antenna of this embodiment. It can be seen that the antenna can achieve good omnidirectional radiation effect within the operating frequency band, and the cross polarization is extremely small. As Figure 8 shown, it is the radiation pattern in the xoz plane of the broadband omnidirectional conformal slotted antenna of this embodiment. It can be seen that the gain of the antenna in the vertical plane is relatively stable, and the cross polarization is small. As Figure 9 shown, it is the gain curve graph of the broadband omnidirectional conformal slotted antenna of this embodiment. It can be seen that the gain of the antenna in the horizontal plane remains stable within the operating frequency band, and good radiation effect can be achieved.

[0042] In summary, the antenna of the present invention uses slots to provide low-frequency resonance points and microstrip open circuits to provide high-frequency resonance points, enabling the antenna to achieve dual operating frequency bands. This design greatly expands the operating bandwidth of the antenna and overcomes the problem of insufficient antenna bandwidth. The antenna adopts a circular ring design and applies a double-layer pattern compensation design method, enabling the antenna to achieve omnidirectional radiation performance and overcoming the difficulty of omnidirectional radiation of traditional back cavity slotted antennas. The antenna can also be perfectly conformal with the cylindrical shape and has broad application prospects.

[0043] Although the present invention has been described in connection with the embodiments, however, in the process of implementing the claimed invention, those skilled in the art can understand and realize other variations of the disclosed embodiments by viewing the drawings, the disclosure content, and the like. In the specification, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit can implement several functions listed in the specification. Certain measures are recited in different embodiments, but this does not mean that these measures cannot be combined to produce good results.

[0044] Although the present invention has been described in connection with specific features and their embodiments, it is obvious that various modifications and combinations can be made without departing from the spirit and scope of the present invention. Accordingly, the present specification and the drawings are merely exemplary descriptions of the present invention and are considered to have covered any and all modifications, variations, combinations, or equivalents within the scope of the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the present invention and its equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A broadband omnidirectional conformal long slot antenna, characterized in that: The invention comprises two antenna units arranged in an upper and lower position, and the two antenna units are rotated relative to each other along the center with a difference of 45 degrees. Each antenna unit comprises a circular metal resonant cavity, a first circular dielectric substrate, a metal ring, a second circular dielectric substrate and a microstrip metal feed line arranged in sequence from the inside to the outside, and a long circular slit is opened at the center of the metal ring.

2. The broadband omnidirectional conformal long slot antenna according to claim 1, characterized in that: A circular cross-section groove is opened at the center of the circular ring-shaped metal resonant cavity, and the first circular ring-shaped dielectric substrate is embedded in the circular cross-section groove.

3. The broadband omnidirectional conformal long slot antenna according to claim 1, characterized in that: The metal ring is placed around the outer surface of the first annular dielectric substrate.

4. The broadband omnidirectional conformal long slot antenna according to claim 1, characterized in that: The microstrip metal feed line is etched on the outer surface of the second annular dielectric substrate.

5. The broadband omnidirectional conformal long slot antenna according to claim 1, characterized in that: One end of the microstrip metal feed line is located at the lower edge of the second annular dielectric substrate as a feeding port, and the other end of the microstrip metal feed line is close to the upper edge of the second annular dielectric substrate.

6. The broadband omnidirectional conformal long slot antenna according to claim 1, characterized in that: Each antenna unit has N microstrip metal feed lines, and the N microstrip metal feed lines are arranged in a rotational manner along the center of the second annular dielectric substrate.

7. The broadband omnidirectional conformal long slot antenna according to claim 6, characterized in that: Each antenna unit has four microstrip metal feed lines, and the four microstrip metal feed lines are arranged along the center of the second annular dielectric substrate rotated by 90 degrees.

8. The broadband omnidirectional conformal long slot antenna according to any one of claims 1 to 7, characterized in that: There is a gap between the two antenna units.

9. The broadband omnidirectional conformal long slot antenna according to any one of claims 1 to 7, characterized in that: The first annular dielectric substrate and the second annular dielectric substrate are both formed by conformally bending a planar microwave dielectric plate along an annular ring.

10. A wireless communication device, characterized in that: It comprises the broadband omnidirectional conformal long slot antenna as described in any one of claims 1 to 9.

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