Broadband slot antenna with notch feature

Abstract

The utility model discloses a broadband slot antenna with a notch characteristic. The broadband slot antenna comprises a dielectric layer; the radiation layer is located on the first side of the dielectric layer, the radiation layer is provided with a radio frequency ground, and the radio frequency ground is provided with a multimode slot radiator; the feed layer is located on the second side of the dielectric layer, the feed layer is provided with a microstrip line structure, the microstrip line structure comprises a microstrip line, a narrow gap is formed in the microstrip line, a feed hole is further formed in the microstrip line, and the feed hole sequentially penetrates through the feed layer, the dielectric layer and the radiation layer; the device is simple in structural design, can ensure that the antenna has excellent radiation performance, has in-band notch characteristics, and can effectively suppress in-band interference.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and particularly to a broadband slot antenna with notch characteristics. Background Art

[0002] Due to the advantages of low profile, small size, light weight, simple design, high data transmission rate, and easy integration with other components, planar broadband slot antennas have received extensive attention and in-depth research from scholars and engineers in the industry. However, the existing reported planar broadband slot antennas often do not have notch characteristics and cannot effectively suppress in-band interference, severely limiting their use in modern wireless communication terminals. Summary of the Utility Model

[0003] The main purpose of this application is to propose a broadband slot antenna with notch characteristics, aiming to solve the problem that the existing planar broadband slot antennas do not have notch characteristics and cannot effectively suppress in-band interference.

[0004] To achieve the above object, the broadband slot antenna with notch characteristics proposed in this application includes:

[0005] A dielectric layer;

[0006] A radiation layer located on the first side of the dielectric layer. The radiation layer is provided with a radio frequency ground, and a multi-mode slot radiator is opened on the radio frequency ground;

[0007] A feeding layer located on the second side of the dielectric layer. The feeding layer is provided with a microstrip line structure. The microstrip line structure includes a microstrip line. A narrow slot is provided on the microstrip line, and a feeding hole is also opened on the microstrip line. The feeding hole sequentially passes through the feeding layer, the dielectric layer, and the radiation layer.

[0008] Optionally, the narrow slot is a π-shaped slot, which sequentially includes a first vertical slot, a horizontal slot, and a second vertical slot. The first vertical slot and the second vertical slot are arranged parallel to the microstrip line, the horizontal slot is arranged perpendicular to the microstrip line, and the length of the first vertical slot is greater than the length of the second vertical slot.

[0009] Optionally, the length of the second vertical slot is L S1 , the length of the horizontal slot is L S2 , and the length of the first vertical slot is L S3 .

[0010] Optionally, the relationship between the parameters L S1 , L S2 , L S3 of the narrow slot and the notch center frequency f N is

[0011]

[0012] Among them, ε r is the dielectric constant of the dielectric layer.

[0013] Optionally, the multimode slot radiator is located at the center of the RF ground, and the multimode slot radiator is symmetrically distributed about the microstrip line left and right.

[0014] Optionally, the multimode slot radiator includes a first slot and a second slot, and two second slots symmetrically arranged about the center of the first slot are arranged on the first slot.

[0015] Optionally, the length of the RF ground 11 is L G , and the width of the RF ground 11 is W G .

[0016] Optionally, the length of the first slot is L S4 , the length of the second slot is L S5 , the width of the narrow slot is W S1 , the width of the multimode slot radiator is W S2 , the distance from the narrow slot to the edge of the RF ground is D1, the distance between the two second slots is D2, the length of the microstrip line is L F , the width of the microstrip line is W F , and the diameter of the feeding hole is Φ V .

[0017] Optionally, the characteristic impedance of the microstrip line is 50 Ω.

[0018] The technical solution of this application adds a microstrip line structure to the feeding layer of the slot antenna. The microstrip line structure includes a microstrip line with a characteristic impedance of 50 Ω, and a π-shaped narrow slot is provided on the microstrip line; among them, the parameters of the π-shaped narrow slot determine the center frequency of the notch and the isolation degree at the notch center frequency. The structure of this device is simply designed, which can ensure that the antenna has excellent radiation performance and has an in-band notch characteristic, and can effectively suppress in-band interference. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0020] Figure 1Schematic diagram of the hierarchical structure of the broadband slot antenna with notch characteristics of the present application;

[0021] Figure 2 Schematic diagram of the structure of the broadband slot antenna with notch characteristics;

[0022] Figure 3 Schematic diagram of the feed layer structure of the broadband slot antenna with notch characteristics;

[0023] Figure 4 SWR of the broadband slot antenna with notch characteristics vs. parameter L S1 Variation schematic diagram;

[0024] Figure 5 SWR of the broadband slot antenna with notch characteristics vs. parameter L S2 Variation schematic diagram;

[0025] Figure 6 SWR of the broadband slot antenna with notch characteristics vs. parameter L S3 Variation schematic diagram;

[0026] Figure 7 SWR of the broadband slot antenna with notch characteristics vs. parameter W S1 Variation schematic diagram;

[0027] Figure 8 SWR of the broadband slot antenna with notch characteristics vs. parameter D1 variation schematic diagram;

[0028] Figure 9 Schematic diagram of the simulation result of the standing wave of the broadband slot antenna with notch characteristics;

[0029] Figure 10 Schematic diagram of the simulation results of the maximum gain and radiation efficiency of the broadband slot antenna with notch characteristics.

[0030] The realization of the purpose, functional characteristics and advantages of the present application will be further described with reference to the accompanying drawings in combination with the embodiments. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly disposed on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0033] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0035] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present application can be implemented. Therefore, they do not have a technical essence. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the efficacy that the present application can produce and the purpose that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present application.

[0036] Due to the advantages of low profile, small size, light weight, simple design, high data transmission rate, and easy integration with other components, planar broadband slot antennas have received extensive attention and in-depth research from scholars and engineers in the industry. However, the existing reported planar broadband slot antennas often do not have notch characteristics and cannot effectively suppress in-band interference, severely limiting their use in modern wireless communication terminals.

[0037] In view of this, the present application proposes a broadband slot antenna with notch characteristics, including:

[0038] Dielectric layer 2;

[0039] Radiation layer 1, located on the first side of the dielectric layer 2, the radiation layer 1 is provided with a radio frequency ground 11, and a multi-mode slot radiator 12 is opened on the radio frequency ground 11;

[0040] Feeding layer 3, located on the second side of the dielectric layer 2, the feeding layer 3 is provided with a microstrip line structure, the microstrip line structure includes a microstrip line 311, a narrow slot 330 is provided on the microstrip line 311, and a feeding hole 321 is also opened on the microstrip line 311, and the feeding hole 321 sequentially passes through the feeding layer 3, the dielectric layer 2 and the radiation layer 1.

[0041] In the embodiment of the present application, with reference to Figures 1 to 3 , the broadband slot antenna with notch characteristics described above includes: a radiation layer 1, provided with a radio frequency ground 11, a multi-mode slot radiator 12 is opened at the central position of the radio frequency ground 11; a dielectric layer 2; a feeding layer 3, provided with a microstrip line structure.

[0042] With reference to Figure 3 , the microstrip line structure includes a microstrip line 311 with a characteristic impedance of 50Ω, a π-shaped narrow slot 330 is provided on the microstrip line 311, and a feeding hole 321 is also opened on the microstrip line 311. The feeding hole 321 sequentially passes through the feeding layer 3, the dielectric layer 2 and the radiation layer 1. The feeding hole 321 connects the radiation layer 1 and the feeding layer 3, short-circuits the tail end of the microstrip line 311, and can transmit the radio frequency signal sent by the signal source to the multi-mode slot radiator 12 with almost no loss. This structure forms a notch by loading a narrow slot 330 with a short-circuited tail end on the microstrip line 311.

[0043] With reference to Figure 3 , the narrow slot 330 sequentially includes a first vertical slot 331, a horizontal slot 333 and a second vertical slot 332. The first vertical slot 331 and the second vertical slot 332 are arranged parallel to the microstrip line 311, the horizontal slot 333 is arranged perpendicular to the microstrip line 331, the length of the first vertical slot 331 is greater than the length of the second vertical slot 332, the first vertical slot 331 is located on the right side of the horizontal slot 333, and the second vertical slot 332 is located on the left side of the horizontal slot 333.

[0044] With reference to Figure 2, the multi-mode slot radiator 12 is located at the center of the RF ground 11. The multi-mode slot radiator 12 is symmetrically distributed about the microstrip line 311 in the left-right direction. The multi-mode slot radiator 12 includes a first slot 121 and a second slot 122. Two second slots 122 that are symmetric about the center of the first slot are arranged on the first slot 121. Specifically, the first slot 121 is horizontally distributed, and the second slot 122 is vertically distributed. Both of the two second slots 122 are located above the first slot 121, and both of the two second slots 122 are perpendicular to the first slot 121.

[0045] Reference Figure 2 , the length of the RF ground 11 is L G , the width of the RF ground 11 is W G , the length of the second vertical slot 332 is L S1 , the length of the horizontal slot 333 is L S2 , the length of the first vertical slot 331 is L S3 , the length of the first slot 121 of the multi-mode slot radiator 12 is L S4 , the length of the second slot 122 of the multi-mode slot radiator 12 is L S5 , the width of the narrow slot 330 is W S1 , the width of the multi-mode slot radiator 12 is W S2 , the distance from the narrow slot 330 to the edge of the RF ground 11 is D1, the distance between the two second slots 122 is D2, and the length of the microstrip line 311 is L F , the width of the microstrip line 311 is W F , the diameter of the feeding hole 321 is Φ V .

[0046] For this antenna, its controllable notch is introduced by the π-shaped narrow slot 330, and the parameter L of the narrow slot 330 S1 、L S2 、L S3 and the relationship between the notch center frequency f N is

[0047]

[0048] where, ε r is the dielectric constant of the dielectric layer.

[0049] The notch performance of the broadband slot antenna is mainly determined by the parameters L S1 、L S2 、L S3 、W S1 、D1, as Figures 7 - 10 shown, this solution gives the simulation results to illustrate the influence of these parameters on the notch performance, specifically as follows:

[0050] Reference Figure 4 , as the parameter L S1 increases, the VSWR in the passband slightly decreases, the passband slightly widens, the notch center frequency shifts downward, and the VSWR at the notch center frequency first increases and then decreases.

[0051] Reference Figure 5 , as the parameter L S2 increases, the VSWR in the passband slightly decreases, the bandwidth slightly widens, the notch center frequency shifts downward, and the VSWR at the notch center frequency increases.

[0052] Reference Figure 6 , as the parameter L S3 increases, the VSWR in the passband increases, the passband bandwidth is maximum when L S3 = 28.0 mm; the notch center frequency shifts downward, and the VSWR at the notch center frequency first increases and then decreases.

[0053] Reference Figure 7 , as the parameter W S1 increases, the VSWR in the passband decreases, the passband bandwidth increases; the notch center frequency remains unchanged, and the VSWR at the notch center increases.

[0054] Reference Figure 8 , as the parameter D1 increases, the VSWR in the passband decreases, the bandwidth widens; the notch center frequency remains unchanged, and the VSWR at the notch center frequency remains almost unchanged.

[0055] It can be seen from Figures 4 - 8 that the notch center frequency is mainly determined by the parameters L S1 , L S2 and L S3 , and the isolation at the notch center frequency is mainly determined by the parameters L S2 and W S1 ; by appropriately optimizing these parameters, a broadband slot antenna with notch characteristics can be obtained.

[0056] One set of optimized parameters is: L G = 140 mm, W G = 90 mm, L S1 = 13.0 mm, L S2 = 0.6 mm, L S3 = 28.0 mm, L S4 = 88.0 mm, L S5 = 17.0 mm, W S1 = 0.1 mm, W S2 = 4.0 mm, D1 = 10.0 mm, D2 = 38.0 mm, L F = 50 mm, W F = 1.8 mm, Φ V= 1.1 mm.

[0057] Reference Figure 9 , for the broadband slot antenna with optimized parameters, the bandwidth range with a standing wave ratio less than 2 is from 2.2 to 3.18 GHz, the center frequency is 2.69 GHz, the absolute bandwidth is 0.98 GHz, and the relative bandwidth is 36.4%, showing broadband characteristics; within the passband, there are also three transmission poles, located at 2.4, 2.73, and 3.07 GHz respectively, ensuring the flatness of the maximum gain within the passband; within the passband, there is also a notch at 2.61 GHz, and the standing wave ratio at the center frequency of the notch is as high as 22, which can effectively ensure the isolation at the notch.

[0058] Reference Figure 10 , this antenna not only has high gain and high radiation efficiency, but also has a notch with high isolation. At the center frequency of the notch, its isolation can be as high as 19 dB, showing high isolation characteristics.

[0059] The technical solution of this application adds a microstrip line structure to the feeding layer of the slot antenna. The microstrip line structure includes a microstrip line with a characteristic impedance of 50 Ω, and a π-shaped narrow slot is provided on the microstrip line; the parameters of the π-shaped narrow slot determine the center frequency of the notch and the isolation at the center frequency of the notch. The structure design of this device is simple, which can ensure excellent radiation performance of the antenna and has the in-band notch characteristic, and can effectively suppress in-band interference.

[0060] The above are only optional embodiments of this application, and do not limit the patent scope of this application. All equivalent structural transformations made under the inventive concept of this application by using the content of the specification and drawings of this application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of this application.

Claims

1. A broadband slot antenna with notch characteristics, characterized in that: include: dielectric layer; A radiation layer, located on the first side of the dielectric layer, the radiation layer is provided with a radio frequency ground, and the radio frequency ground is provided with a multi-mode slot radiator; A feeding layer is located on the second side of the dielectric layer, the feeding layer is provided with a microstrip line structure, the microstrip line structure includes a microstrip line, a narrow gap is provided on the microstrip line, and a feeding hole is also opened on the microstrip line, and the feeding hole passes through the feeding layer, the dielectric layer and the radiation layer in sequence.

2. The broadband slot antenna with notch characteristics as claimed in claim 1, characterized in that: The narrow gap is a π-shaped gap, and the narrow gap includes a first vertical gap, a transverse gap and a second vertical gap in sequence. The first vertical gap and the second vertical gap are arranged parallel to the microstrip line, the transverse gap is arranged perpendicular to the microstrip line, and the length of the first vertical gap is greater than the length of the second vertical gap.

3. The broadband slot antenna with notch characteristics as claimed in claim 2, characterized in that: The length of the second vertical gap is L S1 , the length of the transverse gap is L S2 , the length of the first vertical gap is L S3 .

4. The broadband slot antenna with notch characteristics as claimed in claim 3, characterized in that: The parameter L of the narrow gap S1 , L S2 , L S3 and the notch center frequency f N The relationship between Among them, ε r is the dielectric constant of the dielectric layer.

5. The broadband slot antenna with notch characteristics according to claim 1, characterized in that: The multi-mode slot radiator is located at the center of the radio frequency ground, and the multi-mode slot radiator is symmetrically distributed about the microstrip line.

6. The broadband slot antenna with notch characteristics as claimed in claim 5, characterized in that: The multi-mode slot radiator includes a first slot and a second slot, and two second slots are arranged on the first slot symmetrically with respect to the center of the first slot.

7. The broadband slot antenna with notch characteristics as claimed in claim 6, characterized in that: The length of the radio frequency ground is L G , the width of the RF ground is W G .

8. The broadband slot antenna with notch characteristics as claimed in claim 7, characterized in that: The length of the first gap is L S4 , the length of the second gap is L S5 , the width of the narrow gap is W S1 , the width of the multi-mode slot radiator is W S2 , the distance from the narrow gap to the edge of the radio frequency ground is D1, the distance between the two second gaps is D2, and the length of the microstrip line is L F , the width of the microstrip line is W F , the diameter of the feed hole is Φ V .

9. The broadband slot antenna with notch characteristics as claimed in claim 1, characterized in that: The characteristic impedance of the microstrip line is 50Ω.

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