Multi-frequency monopole antenna loaded with asymmetric metamaterial unit

Abstract

The utility model relates to the field of multi-frequency monopole antennas, and particularly discloses a multi-frequency monopole antenna loaded with an asymmetric metamaterial unit, which comprises a monopole antenna unit and a branch knot formed by a grounding plate and at least two radiation patches and used for generating resonance in a specific frequency band; the asymmetric metamaterial unit comprises split-ring resonator structures and closed-ring resonator structures, the split-ring resonator structures and the closed-ring resonator structures are arranged at the bottom of the monopole antenna unit at certain intervals, and the split-ring resonator structures and the closed-ring resonator structures do not form a symmetric relationship; by combining the monopole antenna unit and the asymmetric metamaterial unit, the antenna can generate resonance in a plurality of frequency bands, such as 2.4 GHz, 3.5 GHz and 5.8 GHz, so that the antenna can be widely applied to a plurality of communication systems through the multi-frequency working capability, and the requirements of different frequency bands are met; through the introduction of the asymmetric metamaterial unit, the performance indexes such as gain, directivity and efficiency of the antenna are improved, so that the overall performance of a communication system is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of multi -frequency monopole antenna, concretely is a kind of multi -frequency monopole antenna of loading asymmetric metamaterial unit. BACKGROUND

[0002] Under the rapid development of wireless communication technology, as the key component in communication system, the optimization and diversification design of its performance become particularly important.

[0003] Traditional antenna design is often limited to specific frequency band, it is difficult to meet the demand of modern communication to multi -frequency band, wide frequency band.For solving this problem, researchers have proposed a variety of methods to realize the multi -frequency of antenna, such as multi -branch method, multi -slot method etc.

[0004] However, the existing antenna design method has some defects, such as branch or slot is easy to mutually couple, leading to complex antenna structure, size is larger, and not easy to process and practical application. UTILITY MODEL CONTENT

[0005] In order to solve the above technical problems, the utility model provides a kind of multi -frequency monopole antenna of loading asymmetric metamaterial unit, to solve the problem that the antenna design method in prior art has some defects, such as branch or slot is easy to mutually couple, leading to complex antenna structure, size is larger, and not easy to process and practical application.

[0006] A kind of multi -frequency monopole antenna of loading asymmetric metamaterial unit, comprising:

[0007] Monopole antenna unit, branch consisting of ground plate and at least two radiating patches, for generating resonance at specific frequency band;

[0008] Asymmetric metamaterial unit, including open resonant ring structure and closed resonant ring structure, arranged at the bottom of monopole antenna unit with certain interval, and open resonant ring structure and closed resonant ring structure do not constitute symmetric relation;

[0009] Dielectric substrate, for supporting and separating monopole antenna unit and asymmetric metamaterial unit;Wherein, asymmetric metamaterial unit realizes resonance at 3.5GHz frequency band, and monopole antenna unit cooperatively acts, so that antenna can provide stable and high-quality communication service in 2.4GHz, 3.5GHz and 5.8GHz frequency band.

[0010] Preferably, the equivalent permeability of the asymmetric metamaterial unit is negative at 3.5GHz frequency band, and the equivalent dielectric constant is positive, forming magnetic single-negative metamaterial characteristics.

[0011] Preferably, the two radiating patches of the monopole antenna unit form branches, and by adjusting the shape, size and position of the radiating patches, the antenna can be resonated at 2.4GHz and 5.8GHz frequency bands.

[0012] Preferably, the asymmetric metamaterial unit is loaded on the bottom of the monopole antenna unit in a certain interval and arrangement, and by adjusting the number, shape, size and interval of the metamaterial unit, the multi-frequency performance and gain uniformity of the antenna are optimized.

[0013] Preferably, the dielectric substrate is used to support and separate the monopole antenna unit and the asymmetric metamaterial unit, while maintaining the stability and reliability of the antenna structure.

[0014] Preferably, the dielectric substrate adopts a rectangular dielectric substrate, the length Wg of the rectangular dielectric substrate is 38mm, the width Wg1 is 35mm, the thickness h is 1.7mm, the relative dielectric constant is 4.4, and the loss tangent is 0.02.

[0015] Preferably, the outer ring of the open resonant ring structure has a length and a width of A=6.28mm, the inner ring has a length and a width of B=3.34mm, and the opening has a length C=0.48mm, the outer ring and the inner ring of the closed resonant ring structure have the same size as the open resonant ring structure, and the closed resonant ring structure has no opening.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] By combining the monopole antenna unit and the asymmetric metamaterial unit, the antenna can be resonated in multiple frequency bands, such as 2.4GHz, 3.5GHz and 5.8GHz, etc. This multi-frequency working capability enables the antenna to be widely used in various communication systems and meets the needs of different frequency bands.

[0018] By introducing the asymmetric metamaterial unit, the gain, directivity and efficiency of the antenna are improved, thereby improving the overall performance of the communication system. Since the metamaterial has negative refractive index and strong magnetism, it can create a structure smaller than the free space wavelength. Therefore, the antenna loaded with the asymmetric metamaterial unit can be miniaturized and lightweight, which is convenient for installation and use in limited space. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 It is a metamaterial single model schematic diagram of the utility model;

[0021] Figure 3 It is a monopole antenna model schematic diagram of the utility model;

[0022] Figure 4 Figure is a schematic diagram of a resonance point of S21 of the metamaterial unit of the utility model at 3.5GHz due to magnetic resonance;

[0023] Figure 5 Figure is a schematic diagram of the equivalent permittivity of the metamaterial of the utility model;

[0024] Figure 6 Figure is a schematic diagram of the equivalent permeability of the metamaterial of the utility model;

[0025] Figure 7 Figure is a schematic diagram of the monopole antenna reflection of the utility model;

[0026] Figure 8 Figure is a schematic diagram of the multi-frequency working resonance point of the utility model.

[0027] In the figure: 1, ground plate; 2, radiation patch; 3, open resonant ring structure; 4, closed resonant ring structure; 5, dielectric substrate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0029] As shown in Figure 1 :

[0030] Embodiment one: the utility model provides a kind of multi-frequency monopole antenna of loading asymmetric metamaterial unit, comprising:

[0031] Monopole antenna unit, branch that is made of ground plate 1 and at least two radiation patches 2, for producing resonance at specific frequency band;

[0032] As shown in Figure 1 、 Figure 3 And Figure 7 The antenna used in the application is ordinary monopole antenna, which is composed of branch made of ground plate and two radiation patches, so that the antenna can produce resonance at 2.4GHz and 5.8GHz.

[0033] Asymmetric metamaterial unit, including open resonant ring structure 3 and closed resonant ring structure 4, arranged at the bottom of monopole antenna unit at certain interval, and open resonant ring structure 3 and closed resonant ring structure 4 do not constitute symmetric relationship;

[0034] a dielectric substrate 5 for supporting and separating the monopole antenna unit and the asymmetric metamaterial unit; wherein the asymmetric metamaterial unit resonates at the 3.5 GHz frequency band and works together with the monopole antenna unit to enable the antenna to provide stable and high-quality communication services in the 2.4 GHz, 3.5 GHz, and 5.8 GHz frequency bands;

[0035] like Figure 2 and Figure 4 As shown in the figure, the metamaterial unit used in the present invention is a split-ring resonant structure that can achieve resonance at 3.5 GHz. The metamaterial unit is placed in a waveguide environment for simulation. The waveguide model is a cube with a side length of 4.5 mm. According to the HFSS software simulation, it can be seen that the S21 of the designed metamaterial unit has a resonance point at 3.5 GHz due to magnetic resonance.

[0036] like Figure 1 As shown, the multi-frequency monopole antenna loaded with metamaterial units in the present invention is composed of a monopole antenna and a metamaterial unit loaded thereon. The monopole antenna is composed of two rectangular radiating patches forming branches and a ground plane, while the metamaterial units are arranged at a certain interval at the bottom of the antenna. The designed metamaterial unit and ground plane are placed on the lower surface of the dielectric substrate, and the monopole antenna is placed on the upper surface of the dielectric substrate to form a complete metamaterial antenna. There is no gap in the loop of the metamaterial unit on the right, and it is not symmetrical with the metamaterial on the left.

[0037] The asymmetric monopole antenna loaded with metamaterials is based on the original monopole antenna. An open metamaterial loop is added on the left side and a closed metamaterial loop is added on the right side. The two metamaterials jointly generate a resonance point at 3.5GHz, thus realizing multi-frequency operation of the antenna.

[0038] As can be seen from the above, the antenna in the present invention is composed of a monopole antenna unit and an asymmetric metamaterial unit, wherein the monopole antenna unit is a branch consisting of a ground plate and at least two radiating patches, which can resonate at 2.4 GHz and 5.8 GHz. The asymmetric metamaterial unit includes an open resonant ring structure and a closed resonant ring structure, which are arranged at the bottom of the monopole antenna unit at a certain interval and do not form a symmetrical relationship. The dielectric substrate is used to support and separate the two units. Through HFSS software simulation, it is found that the metamaterial unit resonates at the 3.5 GHz frequency band and works together with the monopole antenna unit to enable the antenna to provide stable and high-quality communication services in the 2.4 GHz, 3.5 GHz and 5.8 GHz frequency bands. This asymmetric monopole antenna loaded with metamaterial, on the basis of the original monopole antenna, realizes multi-frequency operation of the antenna by adding open and closed metamaterial loops. It has the advantages of simple structure, small size, easy processing and stable performance.

[0039] As shown in Figures 2 to 8

[0040] Embodiment two: this embodiment is basically the same as the last embodiment, the difference is that the equivalent permeability of the asymmetric metamaterial unit is negative at 3.5GHz frequency band, and the equivalent dielectric constant is positive, forming a magnetic single negative metamaterial characteristic;

[0041] As shown in Figure 4 The equivalent electromagnetic parameters of the metamaterial unit can be calculated by writing operation and checking and correcting program codes through MATLAB software. The results show that the equivalent permeability of the metamaterial is negative at 3.5GHz, and the equivalent dielectric constant is positive, so the metamaterial is a magnetic single negative metamaterial.

[0042] Specifically, the two radiation patches 2 of the monopole antenna unit form a branch, and by adjusting the shape, size and position of the radiation patch 2, the antenna can resonate at 2.4GHz and 5.8GHz frequency bands.

[0043] Specifically, the asymmetric metamaterial unit is loaded at the bottom of the monopole antenna unit according to a certain spacing and arrangement, and by adjusting the number, shape, size and spacing of the metamaterial unit, the multi-frequency performance and gain uniformity of the antenna are optimized.

[0044] Specifically, the dielectric substrate 5 is used to support and separate the monopole antenna unit and the asymmetric metamaterial unit, while maintaining the stability and reliability of the antenna structure.

[0045] Specifically, the dielectric substrate is a rectangular dielectric substrate, the length of the rectangular dielectric substrate is Wg=38mm, the width is Wg1=35mm, the thickness is h=1.7mm, the relative dielectric constant is 4.4, and the loss tangent is 0.02.

[0046] Specifically, the outer ring of the open resonant ring structure 3 is A=6.28mm in length and width, the inner ring is B=3.34mm in length and width, and the opening is C=0.48mm in length. The outer ring and inner ring of the closed resonant ring structure 4 are the same as those of the open resonant ring structure 3, and there is no opening.

[0047] ​As can be seen from the above, the asymmetric metamaterial unit exhibits unique magnetic single-negative characteristics at a 3.5GHz frequency band, i.e. the equivalent permeability is negative and the equivalent permittivity is positive, and the characteristics are verified through accurate calculation of MATLAB software. The antenna unit is composed of a branch formed by two radiation patches and a ground plate, and can produce resonance at 2.4GHz and 5.8GHz frequency bands, the asymmetric metamaterial unit is loaded at the bottom of the antenna in a certain spacing and arrangement mode, and the multi-frequency performance and gain uniformity of the antenna can be optimized by adjusting the number, shape, size and spacing of the asymmetric metamaterial unit, the medium substrate adopts a rectangular design and has specific size, relative permittivity and loss tangent value, so that the stability and reliability of the antenna structure are ensured.

[0048] The standard parts used in the utility model can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings, the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the mechanical parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail herein. The contents not described in detail in the description belong to the prior art known to those skilled in the art.

[0049] In the description of the utility model, the terms "first", "second" are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. The meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0050] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0051] In the utility model, unless another definite provision and limitation, first feature is on second feature "on" or "under" can be first and second feature direct contact, or first and second feature indirect contact through intermediate medium. Moreover, first feature is on second feature "on", "above" and "on" can be first feature is on second feature directly above or obliquely above, or just indicate first feature horizontal height is higher than second feature. First feature is on second feature "under", "below" and "under" can be first feature is on second feature directly below or obliquely below, or just indicate first feature horizontal height is less than second feature.

[0052] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0053] The utility model discloses the embodiment in the drawing, only relate to the structure involved in the embodiment of the present disclosure, other structures can refer to the usual design, under the condition of not conflict, the same embodiment and different embodiments of the present application can be combined mutually.

[0054] Although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical scheme recorded in the foregoing embodiments can be modified, or part of the technical features can be replaced, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A multi-frequency monopole antenna loaded with an asymmetric metamaterial unit, characterized in that: include: A monopole antenna unit, comprising a branch consisting of a ground plane (1) and at least two radiating patches (2), is used to generate resonance in a specific frequency band; The asymmetric metamaterial unit includes an open resonant ring structure (3) and a closed resonant ring structure (4), which are arranged at a certain interval at the bottom of the monopole antenna unit, and the open resonant ring structure (3) and the closed resonant ring structure (4) do not form a symmetrical relationship; A dielectric substrate (5) is used to support and separate the monopole antenna unit and the asymmetric metamaterial unit; wherein the asymmetric metamaterial unit resonates at the 3.5 GHz frequency band and works together with the monopole antenna unit to enable the antenna to provide stable and high-quality communication services in the 2.4 GHz, 3.5 GHz and 5.8 GHz frequency bands.

2. A multi-frequency monopole antenna loaded with an asymmetric metamaterial unit according to claim 1, characterized in that: The equivalent magnetic permeability of the asymmetric metamaterial unit is negative in the 3.5 GHz frequency band, and the equivalent dielectric constant is positive, forming a magnetic single negative metamaterial characteristic.

3. The multi-frequency monopole antenna loaded with an asymmetric metamaterial unit according to claim 2, characterized in that: The two radiation patches (2) of the monopole antenna unit form branches, and by adjusting the shape, size and position of the radiation patches (2), the antenna can resonate at the 2.4 GHz and 5.8 GHz frequency bands.

4. A multi-frequency monopole antenna loaded with an asymmetric metamaterial unit as claimed in claim 3, characterized in that: The asymmetric metamaterial units are loaded at the bottom of the monopole antenna unit according to a certain spacing and arrangement. By adjusting the number, shape, size and spacing of the metamaterial units, the multi-frequency performance and gain uniformity of the antenna are optimized.

5. The multi-frequency monopole antenna loaded with an asymmetric metamaterial unit according to claim 4, characterized in that: The dielectric substrate (5) is used to support and separate the monopole antenna unit and the asymmetric metamaterial unit, while maintaining the stability and reliability of the antenna structure.

6. The multi-frequency monopole antenna loaded with an asymmetric metamaterial unit according to claim 1, characterized in that: The dielectric substrate is a rectangular dielectric substrate with a length Wg=38 mm, a width Wg1=35 mm, a thickness h=1.7 mm, a relative dielectric constant of 4.4, and a loss tangent value of 0.

02.

7. The multi-frequency monopole antenna loaded with an asymmetric metamaterial unit according to claim 1, characterized in that: The outer ring length and width of the open resonant ring structure (3) are both A=6.28mm, the inner ring length and width are both B=3.34mm, and the opening length C=0.48mm. The outer ring and inner ring dimensions of the closed resonant ring structure (4) are the same as those of the open resonant ring structure (3), and there is no opening.

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