Broadband slot antenna with controllable trapped wave

Abstract

The utility model discloses a broadband slot antenna with a controllable notch, and the antenna comprises a radiation layer which is provided with a radio frequency ground, and the radio frequency ground is provided with a multi-mode slot radiator; a dielectric layer; the feed layer is provided with a microstrip line structure and a resonator structure; the microstrip line structure comprises a microstrip line; the resonant body structure comprises a first resonant body and a second resonant body, a feed hole is formed in the microstrip line, and the feed hole sequentially penetrates through the feed layer, the dielectric layer and the radiation layer; and the standing-wave ratio of the notch frequency and the center frequency can be independently controlled by controlling the parameters of the resonance body, so that the notch controllability of the traditional broadband slot antenna is realized.

Description

Technical Field

[0001] This application relates to the technical field of antennas, and particularly to a broadband slot antenna with controllable notch. 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 of traditional broadband slot planar antennas, they have received extensive attention and in-depth research from scholars and engineers in the industry. However, the existing reported broadband traditional slot antennas often do not have the characteristic of controllable notch in the band, and cannot effectively suppress the in-band noise, which greatly limits their use in modern wireless communication terminals. Utility Model Content

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

[0004] To achieve the above object, the broadband slot antenna with controllable notch 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 and a resonator structure; the microstrip line structure includes a microstrip line; the resonator structure includes a first resonator and a second resonator. A feeding hole is opened on the microstrip line, and the feeding hole sequentially passes through the feeding layer, the dielectric layer, and the radiation layer.

[0008] Optionally, both the first resonator and the second resonator are C-shaped resonators, and the first resonator and the second resonator are symmetrically distributed with respect to the microstrip line.

[0009] Optionally, the multi-mode slot radiator is located at the center of the radio frequency ground. The multi-mode slot radiator includes a first slot, a second slot, and a third slot. Two second slots and two third slots are arranged symmetrically above and below the center of the first slot on the first slot.

[0010] Optionally, the length of the second slot is L S1 , the length of the third slot is L S2 , the distance between the second slot and the tail end of the first slot is D S1 , the distance between the third slot and the tail end of the first slot is D S2, the distance between the two third gaps is D S3 , the width of the multimode slot radiator 12 is W S , the dielectric constant of the dielectric layer is ε r ;

[0011] The broadband slot antenna has three transmission poles and one transmission zero. The frequencies corresponding to the three transmission poles are named f from low to high p1 , f p2 , f p3 , and the frequencies corresponding to these three transmission poles and the parameters L S1 , L S2 , D S1 , D S2 , D S3 The relationship between them is:

[0012]

[0013] Optionally, both the first resonator and the second resonator include a first transverse open stub, a vertical microstrip line, and a second transverse open stub connected in sequence;

[0014] The first transverse open stub and the second transverse open stub are arranged parallel to the microstrip line, and the first transverse open stub is close to the microstrip line, the second transverse open stub is far from the microstrip line, and the vertical microstrip line is arranged perpendicular to the microstrip line.

[0015] Optionally, the length of the first transverse open stub is L1, the length of the vertical microstrip line is L2, the length of the second transverse open stub is L3, and the notch center frequency f of the antenna n The relationship between and the parameters L1, L2, and L3 is:

[0016]

[0017] Optionally, the dielectric layer is a PCB board, the dielectric constant of the dielectric layer is 3.38, the dielectric loss is 0.0022, the thickness is 0.762 mm, and the size of the dielectric layer is 90 mm * 140 mm; the size of the dielectric layer can ensure an excellent radiation pattern of the antenna in the passband.

[0018] Optionally, both the radiation layer and the feeding layer are metal layers, and the metal layer is copper-plated with a thickness of 0.035 mm.

[0019] Optionally, the diameter of the feeding hole Φv = 1.4 mm. The function of the feeding hole is to ensure the short circuit at the end of the microstrip feeder, so that the broadband signal can be transmitted to the multimode slot radiator from the microstrip feeder without mismatch.

[0020] Optionally, the characteristic impedance of the microstrip line is 50 Ω.

[0021] The technical solution of this application adds a microstrip line structure and a resonator structure to the feeding layer of the slot antenna. The microstrip line structure includes a microstrip line with a characteristic impedance of 50 Ω. The resonator structure includes a first resonator and a second resonator, and the first resonator and the second resonator are symmetrically distributed above and below the microstrip line. By controlling the parameters of the C-shaped resonator, the notch frequency and the standing wave ratio at the center frequency can be controlled separately, realizing the notch controllability of the traditional broadband slot antenna, and the structure design is simple, which can ensure excellent radiation performance of the antenna. Description of the Drawings

[0022] 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 for use 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.

[0023] Figure 1 It is a schematic diagram of the hierarchical structure of the broadband slot antenna with controllable notch of this application;

[0024] Figure 2 It is a schematic diagram of the structure of the broadband slot antenna with controllable notch;

[0025] Figure 3 It is a schematic diagram of the feeding layer structure of the broadband slot antenna with controllable notch;

[0026] Figure 4 It is a schematic diagram of the variation of the standing wave ratio of the broadband slot antenna with controllable notch with the parameter L1;

[0027] Figure 5 It is a schematic diagram of the variation of the standing wave ratio of the broadband slot antenna with controllable notch with the parameter L2;

[0028] Figure 6 It is a schematic diagram of the variation of the standing wave ratio of the broadband slot antenna with controllable notch with the parameter L3;

[0029] Figure 7 It is a schematic diagram of the variation of the standing wave ratio of the broadband slot antenna with controllable notch with the parameter W1;

[0030] Figure 8 It is a schematic diagram of the variation of the standing wave ratio of the broadband slot antenna with controllable notch with the parameter D1;

[0031] Figure 9 It is a schematic diagram of the variation of the standing wave ratio of the broadband slot antenna with controllable notch with the parameter D2;

[0032] Figure 10 Schematic diagram of the simulation result of the standing wave of a broadband slot antenna with controllable notch

[0033] Figure 11 Schematic diagram of the simulation results of the maximum gain and radiation efficiency of a broadband slot antenna with controllable notch

[0034] The realization of the purpose of this application, functional features and advantages will be further described in conjunction with the embodiments with reference to the accompanying drawings Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with 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 the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application

[0036] 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

[0037] It should be understood that the orientation or positional relationship indicated by the terms "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 accompanying drawings, and 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 cannot be understood as a limitation to the present application

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, such descriptions of "first", "second", etc. are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating 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, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. 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 protection scope required by the present application

[0039] It should be noted that the structures, ratios, sizes, etc. shown in the attached 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 implementable conditions of this application. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the efficacy that this application can generate and the purpose that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in this application.

[0040] Due to the advantages of low profile, small size, light weight, simple design, high data transmission rate, and easy integration with other components of traditional broadband slot planar antennas, they have received extensive attention and in-depth research from scholars and engineers in the industry. However, the existing reported broadband traditional slot antennas often do not have the characteristic of controllable in-band notch, and cannot effectively suppress in-band noise, which greatly limits their use in modern wireless communication terminals.

[0041] In view of this, this application proposes a broadband slot antenna with controllable notch, including:

[0042] Dielectric layer 2;

[0043] Radiation layer 1, located on the first side of the dielectric layer ( Figure 1 the upper side in it), the radiation layer is provided with a radio frequency ground, and a multi-mode slot radiator is opened on the radio frequency ground;

[0044] Feeding layer 3, located on the second side of the dielectric layer ( Figure 1 the lower side in it), the feeding layer is provided with a microstrip line structure and a resonator structure; the microstrip line structure includes a microstrip line 311; the resonator structure includes a first resonator 312 and a second resonator 313, and a feeding hole 321 is opened on the microstrip line, and the feeding hole 321 sequentially passes through the feeding layer 3, the dielectric layer 2 and the radiation layer 1.

[0045] In the embodiment of this application, referring to Figures 1 to 11 , the above-mentioned broadband slot antenna with controllable notch includes: a radiation layer 1, provided with a radio frequency ground 11, and 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 and a resonator structure.

[0046] Referring to Figure 3, the microstrip line structure includes a microstrip line 311 with a characteristic impedance of 50 Ω; the resonator structure includes a first resonator 312 and a second resonator 313. Both the first resonator 312 and the second resonator 313 are C-shaped resonators. The shapes and sizes of the first resonator 312 and the second resonator 313 are the same, and the first resonator 312 and the second resonator 313 are symmetrically distributed above and below the microstrip line 311. The double C-shaped resonator can effectively increase the notch center frequency isolation degree, and notch is realized through a microstrip line with open ends symmetric about the microstrip line 311. A feeding hole 321 is also provided 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 emitted by the signal source to the multi-mode slot radiator 12 with almost no loss.

[0047] The first resonator 312 and the second resonator 313 determine the center frequency of the notch; the radio frequency ground 11 and the multi-mode slot radiator 12 constitute the radiation performance and bandwidth of the antenna.

[0048] Reference Figure 2 , the multi-mode slot radiator 12 is located at the center of the radio frequency ground 11. The multi-mode slot radiator 12 includes a first slot 121, a second slot 122, and a third slot 123. Two second slots 122 and two third slots 123 are arranged symmetrically above and below the center of the first slot 121 on the first slot 121; specifically, the first slot 121 is vertically distributed, the second slot 122 and the third slot 123 are horizontally distributed, the first slot 121 is located at the center of the multi-mode slot radiator 12, the second slot 122 is located on the right side of the multi-mode slot radiator 12, and the third slot 123 is located on the left side of the multi-mode slot radiator 12.

[0049] Reference Figure 2 , the length of the radio frequency ground 11 is L G , the width of the radio frequency ground 11 is W G , the length of the second slot 122 of the multi-mode slot radiator 12 is L S1 , the length of the third slot 123 of the multi-mode slot radiator 12 is L S2 , the distance between the second slot 122 of the multi-mode slot radiator 12 and the tail end of the vertical first slot 121 is D S1 , the distance between the third slot 123 of the multi-mode slot radiator 12 and the tail end of the vertical first slot 121 is D S2 , the distance between the upper left third slot 123 and the lower left third slot 123 of the multi-mode slot radiator 12 is D S3 , the width of the multi-mode slot radiator 12 is W S .

[0050] Reference Figure 3, both the first resonator 312 and the second resonator 313 include a first transverse open stub, a vertical microstrip line, and a second transverse open stub connected in sequence; the first transverse open stub and the second transverse open stub are arranged parallel to the microstrip line, and the first transverse open stub is close to the microstrip line, the second transverse open stub is far from the microstrip line, and the vertical microstrip line is arranged perpendicular to the microstrip line.

[0051] Reference Figure 3 , the length of the microstrip line 311 is L F , the width of the microstrip line 311 is W F , the length of the first transverse open stub is L1, the length of the vertical microstrip line is L2, the length of the second transverse open stub is L3, the width of the resonator structure is W1, the distance between the resonator structure and the microstrip line 311 is D1, the distance between the resonator structure and the left edge of the RF ground 11 is D2, and the diameter of the feeding hole 321 is Φ V .

[0052] Based on this structure, the designed broadband slot antenna has three transmission poles and one transmission zero. The frequencies corresponding to the three transmission poles are named f from low to high p1 , f p2 , f p3 , and the frequencies corresponding to these three transmission poles and the parameters L S1 , L S2 , D S1 , D S2 , D S3 , and the relationship between them is:

[0053]

[0054] Among them, the dielectric constant of the dielectric layer is ε r , the notch center frequency f of the antenna n and the relationship between the parameters L1, L2, and L3 can be summarized as:

[0055]

[0056] Adding a microstrip line with both ends open near the microstrip line 311 can introduce a transmission zero as a notch, and the relationship between the notch center frequency and the size of the microstrip line with both ends open is as described in the formula.

[0057] Reference Figure 4 , as the parameter L1 increases, its notch center frequency moves down, the standing wave ratio at the center frequency first increases and then decreases, and the bandwidth remains almost unchanged.

[0058] Reference Figure 5 , as the parameter L2 increases, its notch center frequency moves down, the standing wave ratio at the center frequency first increases and then slightly decreases, and the bandwidth remains almost unchanged.

[0059] Reference Figure 6 As the parameter L3 increases, the notch center frequency moves downward, the standing wave ratio at the center frequency first increases and then slightly decreases, and the bandwidth remains almost unchanged.

[0060] Reference Figure 7 As the parameter W1 increases, the notch center frequency slightly moves downward, the standing wave ratio at the center frequency slightly decreases, and the bandwidth remains almost unchanged.

[0061] Reference Figure 8 As the parameter D1 increases, the notch center frequency slightly moves downward, the standing wave at the center frequency first increases and then decreases, and the bandwidth remains almost unchanged.

[0062] Reference Figure 9 As the parameter D2 increases, the notch center frequency slightly moves downward, the standing wave at the center frequency first increases and then decreases, and the bandwidth remains almost unchanged.

[0063] In this example, the dielectric layer 2 is a PCB board, the radiation layer 1 and the feeding layer are both metal layers. The dielectric constant of the dielectric layer 2 is 3.38, the dielectric loss is 0.0022, the thickness is 0.762 mm, the size of the dielectric layer 2 is 90 mm * 140 mm, and the size of the dielectric layer can ensure an excellent radiation pattern of the antenna in the passband; the metal layer is copper-plated with a thickness of 0.035 mm.

[0064] As can be seen from the above simulation, by controlling the parameters of the C-shaped resonator, the notch frequency and the standing wave ratio at the center frequency can be controlled separately. After optimization, a set of design parameters for the example can be obtained: L G = 90 mm, W G = 140 mm, L S1 = 15.5 mm, L S2 = 16.4 mm, D S1 = 16.0 mm, D S2 = 20.1 mm, D S3 = 34.1 mm, W S = 3.9 mm, L F = 50 mm, W F = 1.8 mm, L1 = 15.0 mm, L2 = 0.6 mm, L3 = 20.0 mm, W1 = 0.1 mm, D1 = 0.4 mm, D2 = 10.0 mm, Φ V = 1.4 mm.

[0065] Reference Figure 10, As can be seen from the figure, the antenna has an in-band notch characteristic. The bandwidth range with a standing wave ratio less than 2 is from 2.36 to 3.52 GHz, the center frequency is 2.94 GHz, the absolute bandwidth is 1.16 GHz, and the relative bandwidth is 39.5%, showing broadband characteristics. In the passband, there are also three transmission poles, located at 2.81, 3.2, and 3.42 GHz respectively, ensuring the flatness of the maximum gain in the passband. In addition, there is a notch in the passband, with a center frequency of 3.02 GHz and a standing wave ratio of 19.1 at the center frequency, which can ensure a high isolation degree.

[0066] Reference Figure 11 , As can be seen from the figure, the maximum gain in the passband is not less than 4.38 dBi, and the radiation efficiency in the passband is not less than 85%. It can be seen that the antenna has high gain and high radiation efficiency in the passband. At the center frequency of the notch, the isolation degree is as high as 17.5 dB, showing high isolation characteristics.

[0067] The technical solution of this application adds a microstrip line structure and a resonator structure to the feeding layer of the slot antenna. The microstrip line structure includes a microstrip line with a characteristic impedance of 50 Ω. The resonator structure includes a first resonator and a second resonator, and the first resonator and the second resonator are symmetrically distributed above and below the microstrip line; by controlling the parameters of the C-shaped resonator, the frequency of the notch and the standing wave ratio at the center frequency can be controlled separately, realizing the notch controllability of the traditional broadband slot antenna.

[0068] The above are only optional embodiments of this application, and do not limit the patent scope of this application accordingly. Any equivalent structural transformation made under the inventive concept of this application by using the content of the specification and drawings of this application, or any direct / indirect application in other related technical fields is included in the patent protection scope of this application.

Claims

1. A broadband slot antenna with controllable notch, 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, and the feeding layer is provided with a microstrip line structure and a resonant body structure; the microstrip line structure includes a microstrip line; the resonant body structure includes a first resonator and a second resonator, and a feeding hole is 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 controllable notch according to claim 1, characterized in that: The first resonator and the second resonator are both C-type resonators, and the first resonator and the second resonator are symmetrically distributed about the microstrip line.

3. The broadband slot antenna with controllable notch according to claim 1, characterized in that: The multimode slot radiator is located at the center of the radio frequency ground, and includes a first slot, a second slot and a third slot. The first slot is provided with two second slots and two third slots symmetrically arranged about the center of the first slot.

4. The broadband slot antenna with controllable notch as claimed in claim 3, characterized in that: The length of the second gap is L S1 , the length of the third gap is L S2 , the distance between the second gap and the tail end of the first gap is D S1 , the distance between the third gap and the tail end of the first gap is D S2 , the distance between the two third gaps is D S3 , the width of the multi-mode slot radiator (12) is W S , the dielectric constant of the dielectric layer is ε r ; The broadband slot antenna has three transmission poles and one transmission zero point. The frequencies corresponding to the three transmission poles are named f p1 , f p2 , f p3 , and the frequencies corresponding to these three transmission poles are related to the parameter L S1 , L S2 , D S1 , D S2 , D S3 The relationship between , is:

5. The broadband slot antenna with controllable notch as claimed in claim 4, characterized in that: The first resonator and the second resonator each include a first transverse open-circuit branch, a vertical microstrip line and a second transverse open-circuit branch connected in sequence; The first transverse open branch and the second transverse open branch are arranged parallel to the microstrip line, and the first transverse open branch is close to the microstrip line, the second transverse open branch is far away from the microstrip line, and the vertical microstrip line is arranged perpendicular to the microstrip line.

6. The broadband slot antenna with controllable notch according to claim 5, characterized in that: The length of the first transverse open-circuit branch is L1, the length of the vertical microstrip line is L2, the length of the second transverse open-circuit branch is L3, and the notch center frequency f of the antenna is n The relationship between the parameters L1, L2, and L3 is:

7. The broadband slot antenna with controllable notch according to claim 1, characterized in that: The dielectric layer is a PCB board, the dielectric constant of the dielectric layer is 3.38, the dielectric loss is 0.0022, the thickness is 0.762 mm, and the size of the dielectric layer is 90 mm*140 mm.

8. The broadband slot antenna with controllable notch as claimed in claim 7, characterized in that: The radiation layer and the feed layer are both metal layers, and the metal layers are copper-plated with a thickness of 0.035 mm.

9. The broadband slot antenna with controllable notch according to claim 8, characterized in that: The diameter of the feed hole Φ v =1.4mm.

10. The broadband slot antenna with controllable notch according to claim 1, characterized in that: The characteristic impedance of the microstrip line is 50Ω.

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