Broadband slot antenna

Abstract

The embodiment of the utility model provides a broadband slot antenna. The broadband slot antenna comprises a first metal layer, a dielectric layer and a second metal layer, the dielectric layer is arranged between the first metal layer and the second metal layer to limit direct contact between the first metal layer and the second metal layer; a metal via hole penetrating through the first metal layer, the dielectric layer and the second metal layer is formed in the broadband slot antenna; the second metal layer comprises a first microstrip line, three parallel lines and a second microstrip line; one end of the parallel three line is connected to the first microstrip line, and the other end of the parallel three line is connected to one end of the second microstrip line; the other end of the second microstrip line is connected with the first metal layer through a metal via hole; the first metal layer can be used as a grounding end of the broadband slot antenna; and a multimode slot radiator is arranged on the first metal layer. By adding the parallel three-wire structure design, compared with a traditional broadband slot antenna, the broadband slot antenna has the filtering characteristic.

Description

Technical Field

[0001] The utility model relates to the technical field of planar antennas, in particular to a broadband slot antenna with filtering characteristics. Background Art

[0002] At present, the application of wireless communication terminals is becoming more and more extensive, which has led to the rapid development of wireless communication technology. Antennas, as the bridge and air interface of wireless communication technology, are bound to be the focus of research.

[0003] Planar broadband slot antennas have received extensive attention and in-depth research from scholars and engineers in the industry due to their advantages such as low profile, small size, light weight, simple design, high data transmission rate, and easy integration with other components.

[0004] In the prior art, traditional broadband slot antennas still have some defects: traditional broadband slot antennas do not have filtering functions, so the RF front end usually needs to add filters to meet practical requirements (for example, adding additional bandpass filters to suppress out-of-band noise). The addition of filters will not only increase the size of the wireless communication terminal, but also bring additional losses, which greatly limits the use of traditional broadband slot antennas in modern wireless communication terminals. Utility Model Content

[0005] The broadband slot antenna provided by the utility model aims to solve at least a part of the defects of the existing broadband slot antenna.

[0006] The utility model provides a broadband slot antenna. The broadband slot antenna comprises:

[0007] A first metal layer, a dielectric layer and a second metal layer; the dielectric layer is arranged between the first metal layer and the second metal layer to limit direct contact between the first metal layer and the second metal layer;

[0008] The broadband slot antenna is provided with a metal via penetrating the first metal layer, the dielectric layer and the second metal layer;

[0009] The second metal layer includes: a first microstrip line, three parallel lines and a second microstrip line; one end of the three parallel lines is connected to the first microstrip line, and the other end of the three parallel lines is connected to one end of the second microstrip line; the other end of the second microstrip line is connected to the first metal layer through the metal via;

[0010] The first metal layer can be used as a ground terminal of the broadband slot antenna; and a multi-mode slot radiator is arranged on the first metal layer.

[0011] In some embodiments, the multi-mode slot radiator is disposed at a central position of the first metal layer.

[0012] In some embodiments, the characteristic impedance of the first microstrip line is equal to the characteristic impedance of the second microstrip line.

[0013] In some embodiments, the first microstrip line has a first length dimension, and the second microstrip line has a second length dimension; the first length dimension is smaller than the second length dimension;

[0014] The first microstrip line has a first width dimension, and the second microstrip line has a second width dimension; the first width dimension is equal to the second width dimension.

[0015] In some embodiments, the first metal layer is rectangular; the first metal layer has a preset length dimension in a length direction, and the first metal layer has a preset width dimension in a width direction.

[0016] In some implementations, the multimode slot radiator includes:

[0017] A horizontal slot radiation portion, a pair of first vertical slot radiation portions, and a pair of second vertical slot radiation portions;

[0018] The horizontal slot radiation portion extends along the length direction and has a first side and a second side that are away from each other in the width direction;

[0019] A pair of the first vertical slot radiation portions are vertically disposed on a first side of the horizontal slot radiation portion, and a pair of the second vertical slot radiation portions are vertically disposed on a second side of the horizontal slot radiation portion.

[0020] In some implementations, the horizontal slot radiation portion has a first end and a second end that are opposite to each other in the length direction;

[0021] One of the first vertical slot radiating portions of the multi-mode slot radiator is close to the first end and has a first preset distance from the first end;

[0022] Another first vertical slot radiating portion of the multi-mode slot radiator is close to the second end and has a second preset distance from the second end;

[0023] Wherein, the first preset distance is equal to the second preset distance.

[0024] In some embodiments, one of the second vertical slot radiating portions of the multi-mode slot radiator is close to the first end and has a first preset distance from the first end;

[0025] Another second vertical slot radiating portion of the multi-mode slot radiator is close to the second end and has a second preset distance from the second end;

[0026] There is a preset gap between a pair of the second vertical slot radiation portions; the first preset spacing is equal to the second preset spacing; and the first preset distance is smaller than the first preset spacing.

[0027] In some embodiments, the horizontal slot radiation portion has a first slot width, the first vertical slot radiation portion has a second slot width, and the second vertical slot radiation portion has a third slot width;

[0028] The first gap width, the second gap width and the third gap width are all equal.

[0029] In some embodiments, the first vertical slot radiation portion has a first slot length, and the second vertical slot radiation portion has a second slot length;

[0030] Wherein, the first gap length is smaller than the second gap length.

[0031] At least one beneficial effect of the broadband slot antenna provided by the embodiment of the utility model is that by adding a parallel three-wire structural design, the broadband slot antenna also has filtering characteristics compared with the traditional broadband slot antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0033] Figure 1 It is a schematic diagram of the structure of a broadband slot antenna provided by an embodiment of the utility model;

[0034] Figure 2 It is a schematic structural diagram of the broadband slot antenna provided by an embodiment of the utility model, and the parts related to the first metal layer and the second metal layer;

[0035] Figure 3 is a schematic structural diagram of the first metal layer provided in an embodiment of the utility model;

[0036] Figure 4 is a schematic structural diagram of the second metal layer provided in an embodiment of the utility model;

[0037] Figure 5 is a schematic layout diagram of the first metal layer provided in an embodiment of the utility model;

[0038] Figure 6 is a schematic layout diagram of the second metal layer provided in an embodiment of the utility model;

[0039] Figure 7 It is a diagram of the reflection coefficient and maximum gain simulation results of the broadband slot antenna provided in the embodiment of the utility model.

[0040] Figure numerals: 100, broadband slot antenna; 1001, length direction; 1002, width direction; 1, first metal layer; 101, multi-mode slot radiator; 1011, horizontal slot radiating portion; 1012, first vertical slot radiating portion; 1013, second vertical slot radiating portion; 2, dielectric layer; 3, second metal layer; 311, first microstrip line; 312, three parallel lines; 313, second microstrip line; 321, metal via. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with specific embodiments. It should be emphasized that the following description is merely illustrative and is not intended to limit the scope and application of the present invention.

[0042] It should be noted that, unless otherwise clearly specified and limited, the terms "vertical", "parallel", "length direction", "width direction", "mutual deviation" and the like used in this specification indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. Terms such as "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated; therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features; "multiple" or "several" means two or more; "and / or" includes any and all combinations of one or more related listed items. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] Figure 1 It is a structural schematic diagram of a broadband slot antenna provided by an embodiment of the utility model. Figure 2It is a structural schematic diagram of the broadband slot antenna provided by an embodiment of the utility model and the parts related to the first metal layer and the second metal layer. Figure 3 It is a schematic diagram of the structure of the first metal layer provided in an embodiment of the utility model. Figure 4 It is a schematic diagram of the structure of the second metal layer provided in an embodiment of the utility model.

[0044] See also Figure 1-Figure 4 The broadband slot antenna 100 includes: a first metal layer 1, a dielectric layer 2 and a second metal layer 3.

[0045] It can be understood that the dielectric layer 2 is disposed between the first metal layer 1 and the second metal layer 3 to limit the direct contact between the first metal layer 1 and the second metal layer 3 .

[0046] Specifically, the dielectric layer 2 can not only achieve antenna isolation, radiation enhancement and impedance matching, but also provide mechanical support, thereby effectively ensuring the normal operation and performance of the broadband slot antenna 100; wherein, the dielectric layer 2, as an isolation layer, can form a certain isolation protection between the first metal layer 1 and the second metal layer 3, prevent the first metal layer 1 and the second metal layer 3 from directly contacting each other and causing a short circuit, and can effectively ensure the normal operation of the broadband slot antenna 100; in addition, the dielectric layer 2 can enhance the radiation effect of the broadband slot antenna 100 by changing the distribution and propagation characteristics of the electromagnetic field, thereby improving the performance and working frequency band of the broadband slot antenna 100; moreover, the selection and design of the dielectric layer 2 can adjust the impedance of the broadband slot antenna 100, so that the impedance of the dielectric layer 2 matches the impedance of the input port and the output port, which can effectively reduce the reflection loss of the signal, thereby improving the transmission efficiency of the antenna; finally, the dielectric layer 2 can also provide mechanical support. Since the dielectric layer 2 is arranged between the first metal layer 1 and the second metal layer 3, the dielectric layer 2 can enhance the structural strength of the broadband slot antenna 100 to ensure the stability and reliability of the broadband slot antenna 100.

[0047] It should be noted that the first metal layer 1, the dielectric layer 2 and the second metal layer 3 are combined to form a microstrip structure; wherein the thickness of the dielectric layer 2 determines the operating frequency range of the broadband slot antenna 100 (the smaller the thickness of the dielectric layer 2, the higher the operating frequency of the broadband slot antenna 100); in addition, the geometric shape of the first metal layer 1 (for example, the shape of the first metal layer 1 can be rectangular, circular, elliptical, etc.) and the multi-mode slot radiator 101 arranged on the first metal layer 1 jointly determine the radiation characteristics of the broadband slot antenna 100; finally, the three parallel lines 312 on the second metal layer 3 and the multi-mode slot radiator 101 arranged on the first metal layer 1 jointly determine the bandwidth of the broadband slot antenna 100.

[0048] The broadband slot antenna 100 is provided with a metal via 321 penetrating the first metal layer 1 , the dielectric layer 2 and the second metal layer 3 .

[0049] In addition, the second metal layer 3 includes: a first microstrip line 311 , three parallel lines 312 , and a second microstrip line 313 .

[0050] Specifically, one end of the three parallel lines 312 is connected to the first microstrip line 311 , and the other end of the three parallel lines 312 is connected to one end of the second microstrip line 313 ; the other end of the second microstrip line 313 is connected to the first metal layer 1 through the metal via 321 .

[0051] Moreover, the first metal layer 1 can be used as a ground terminal of the broadband slot antenna 100 ; a multi-mode slot radiator 101 is disposed on the first metal layer 1 .

[0052] It should be noted that the multi-mode slot radiator 101, as a radiating element of the broadband slot antenna 100, can achieve signal radiation through slot radiation coupling.

[0053] In some embodiments, see Figure 2 and Figure 3 , the multi-mode slot radiator 101 is arranged at the center of the first metal layer 1 .

[0054] In some embodiments, Figure 2 and Figure 4 As shown, the characteristic impedance of the first microstrip line 311 is equal to the characteristic impedance of the second microstrip line 313 .

[0055] In the embodiment of the present application, the characteristic impedance of the first microstrip line 311 and the characteristic impedance of the second microstrip line 313 are both 50Ω.

[0056] Figure 5 It is a schematic layout of the first metal layer provided in an embodiment of the utility model. Figure 6 It is a schematic layout of the second metal layer provided in an embodiment of the utility model.

[0057] In some embodiments, in combination Figure 2 , Figure 4 and Figure 6 It can be seen that the first microstrip line 311 has a first length dimension L F1 The second microstrip line 313 has a second length dimension L F2 ; The first length dimension L F1 Smaller than the second length dimension L F2 .

[0058] It can be understood that the first microstrip line 311 has a first width dimension, and the second microstrip line 313 has a second width dimension; the first width dimension is equal to the second width dimension.

[0059] It should be noted that the size parameter W F denoted by φ(x) are the width dimensions of the first microstrip line 311 and the second microstrip line 313 (the width dimensions include the first width dimension and the second width dimension).

[0060] In some embodiments, according to Figure 3 and Figure 5 It can be seen that the first metal layer 1 is rectangular; the first metal layer 1 has a preset length dimension L in the length direction 1001. G The first metal layer 1 has a preset width dimension W in the width direction 1002. G .

[0061] In some implementations, see Figure 3 The multi-mode slot radiator 101 includes: a horizontal slot radiating portion 1011, a pair of first vertical slot radiating portions 1012 and a pair of second vertical slot radiating portions 1013.

[0062] The horizontal slot radiation portion 1011 extends along the length direction 1001 , and has a first side and a second side that are opposite to each other in the width direction 1002 .

[0063] In addition, a pair of first vertical slot radiation portions 1012 are vertically disposed on a first side of the horizontal slot radiation portion 1011 , and a pair of second vertical slot radiation portions 1013 are vertically disposed on a second side of the horizontal slot radiation portion 1011 .

[0064] In some implementations, such as Figure 3 and Figure 5 As shown, the horizontal slot radiation portion 1011 has a first end and a second end which are opposite to each other in the length direction 1001 .

[0065] Specifically, one of the first vertical slot radiating portions 1012 of the multi-mode slot radiator 101 is close to the first end and has a first preset distance from the first end.

[0066] Moreover, another first vertical slot radiating portion 1012 of the multi-mode slot radiator 101 is close to the second end and has a second preset distance from the second end.

[0067] In the embodiment of the present application, the first preset distance and the second preset distance are equal.

[0068] Specifically, the size parameter D S1 It represents a preset distance between the first vertical slot radiation portion 1012 and the end of the horizontal slot radiation portion 1011 (the preset distance includes a first preset distance and a second preset distance).

[0069] In some embodiments, according to Figure 3 and Figure 5 It can be known that one of the second vertical slot radiating portions 1013 of the multi-mode slot radiator 101 is close to the first end and has a first preset distance from the first end.

[0070] Among them, another second vertical slot radiating portion 1013 of the multi-mode slot radiator 101 is close to the second end and has a second preset distance between it and the second end.

[0071] In addition, there is a preset gap D between a pair of second vertical slot radiation portions 1013. S3 ; The first preset distance is equal to the second preset distance; The first preset distance is smaller than the first preset distance.

[0072] It should be noted that the dimension parameter D S2 It represents a preset distance between the second vertical slot radiation portion 1013 and the end of the horizontal slot radiation portion 1011 (the preset distance includes a first preset distance and a second preset distance).

[0073] In some embodiments, in combination Figure 3 and Figure 5 It can be seen that the horizontal slot radiation portion 1011 has a first slot width, the first vertical slot radiation portion 1012 has a second slot width, and the second vertical slot radiation portion 1013 has a third slot width.

[0074] The first gap width, the second gap width and the third gap width are all equal.

[0075] In addition, the size parameter W S It represents the slot width of the horizontal slot radiation portion 1011, the slot width of the first vertical slot radiation portion 1012 and the slot width of the second vertical slot radiation portion 1013 (the slot width includes the first slot width, the second slot width and the third slot width).

[0076] In some embodiments, the first vertical slot radiation portion 1012 has a first slot length L S1 The second vertical slot radiation portion 1013 has a second slot length L S2 .

[0077] In the embodiment of the present application, the first gap length L S1 Less than the second gap length L S2 .

[0078] In some embodiments, see Figure 4 and Figure 6 The parallel three-line transmission system consists of three transmission lines that are parallel to each other and are spaced at a preset transmission spacing.

[0079] In order to facilitate readers to understand the concept of the present invention, a simulation experiment is performed on the actual broadband slot antenna 100 as follows.

[0080] In this simulation, see Figure 5 and Figure 6 The dielectric constant of the dielectric layer is 3.38, the dielectric loss of the dielectric layer is 0.0022, and the thickness of the dielectric layer is 0.762mm; the first metal layer 1 and the second metal layer 2 are copper-plated, and the thickness of the first metal layer 1 and the second metal layer 2 are both 0.035mm; the size specifications of the first metal layer 1 are: the length dimension is 90mm and the width dimension is 140mm.

[0081] Combine 5 and Figure 6 It can be seen that the optimized size parameters are: L F1 =10mm; L F2 =21.4mm; W F =1.8mm; L G =140mm; W G =90mm; D S1 =16.0mm; D S2 =20.1mm; D S3 =34.1mm; W S =3.9mm; L S1 =15.5mm; L S2 =16.4mm; L P =17.5mm; W P =0.1mm; S P =0.35mm; Φ V =1.4mm.

[0082] Among them, L F1 is the physical length of the first microstrip line 311; L F2 is the physical length of the second microstrip line 313; W F L is the physical width of the first microstrip line 311 and the second microstrip line 313; G is the physical length of the first metal layer 1; W G is the physical width of the first metal layer 1; D S1 is the physical distance between the first vertical slot radiation portion 1012 and the horizontal slot radiation portion 1011; D S2 is the physical distance between the second vertical slot radiation portion 1013 and the horizontal slot radiation portion 1011; D S3 is the physical gap between a pair of second vertical slot radiation portions 1013; W S L is the slot width of the multi-mode slot radiator 101; S1 L is the slot width of the first vertical slot radiation portion 1012; S2L is the slot width of the second vertical slot radiation portion 1013; P is the transmission length of any one of the three parallel lines 312; W P is the transmission width of any one of the three parallel lines 312; S P is the transmission distance between two adjacent transmission lines of the parallel three-line 312; Φ V is the diameter of the metal via 321 (Φ V Not marked in the figure).

[0083] Figure 7 It is a diagram of the reflection coefficient and maximum gain simulation results of the broadband slot antenna provided in the embodiment of the utility model.

[0084] The simulation results of the reflection coefficient and maximum gain of the broadband slot antenna of the utility model are as follows: Figure 7 As shown, the broadband slot antenna has a reflection coefficient less than -10 dB in a bandwidth range of 2.24 GHz to 3.60 GHz, a center frequency of 2.92 GHz, an absolute bandwidth of 1.36 GHz, and a relative bandwidth of 46.6%, showing broadband characteristics.

[0085] The average maximum gain of the broadband slot antenna in the passband is 5.58 dBi, showing the advantage of high gain. It can be determined that the broadband slot antenna has filtering characteristics.

[0086] In the above passband, there are four transmission poles, located at 2.51 GHz, 2.96 GHz, 3.26 GHz, and 3.55 GHz, respectively, thereby ensuring the flatness of the maximum gain in the passband.

[0087] Specifically, some reference methods for judging whether a broadband slot antenna has filtering characteristics through simulation result graphs of reflection coefficient and maximum gain are as follows: judging by observing the graphical trend of the simulation result graph and judging by observing whether the simulation result graph shows a higher maximum gain.

[0088] Among them, if within a certain bandwidth range, the reflection coefficient decreases while the maximum gain increases, it means that the broadband slot antenna has filtering characteristics.

[0089] In addition, if the reflection coefficient is low and the maximum gain is high within a certain bandwidth range, it means that the broadband slot antenna has filtering characteristics.

[0090] In summary, the broadband slot antenna provided by the embodiment of the utility model has a filtering feature compared to the traditional broadband slot antenna by adding a parallel three-wire structural design. Therefore, the topological structure, bandpass filter and communication device provided by the embodiment of the utility model have certain novelty compared to the traditional topological structure, bandpass filter and communication device.

[0091] The above contents are further detailed descriptions of the present invention in combination with specific / preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A broadband slot antenna, characterized in that: include: a first metal layer, a dielectric layer, and a second metal layer; The dielectric layer is disposed between the first metal layer and the second metal layer to limit direct contact between the first metal layer and the second metal layer; The broadband slot antenna is provided with a metal via penetrating the first metal layer, the dielectric layer and the second metal layer; The second metal layer includes: a first microstrip line, three parallel lines and a second microstrip line; one end of the three parallel lines is connected to the first microstrip line, and the other end of the three parallel lines is connected to one end of the second microstrip line; the other end of the second microstrip line is connected to the first metal layer through the metal via; The first metal layer can be used as a ground terminal of the broadband slot antenna; and a multi-mode slot radiator is arranged on the first metal layer.

2. The broadband slot antenna according to claim 1, wherein: The multi-mode slot radiator is arranged at the center of the first metal layer.

3. The broadband slot antenna according to claim 1, wherein: The characteristic impedance of the first microstrip line is equal to the characteristic impedance of the second microstrip line.

4. The broadband slot antenna according to claim 1, wherein: The first microstrip line has a first length dimension, and the second microstrip line has a second length dimension; the first length dimension is smaller than the second length dimension; The first microstrip line has a first width dimension, and the second microstrip line has a second width dimension; the first width dimension is equal to the second width dimension.

5. The broadband slot antenna according to claim 1, wherein: The first metal layer is rectangular; the first metal layer has a preset length dimension in a length direction, and the first metal layer has a preset width dimension in a width direction.

6. The broadband slot antenna according to claim 5, characterized in that: The multi-mode slot radiator comprises: A horizontal slot radiation portion, a pair of first vertical slot radiation portions, and a pair of second vertical slot radiation portions; The horizontal slot radiation portion extends along the length direction and has a first side and a second side that are away from each other in the width direction; A pair of the first vertical slot radiation portions are vertically disposed on a first side of the horizontal slot radiation portion, and a pair of the second vertical slot radiation portions are vertically disposed on a second side of the horizontal slot radiation portion.

7. The broadband slot antenna according to claim 6, wherein: The horizontal slot radiation portion has a first end and a second end which are away from each other in the length direction; One of the first vertical slot radiating portions of the multi-mode slot radiator is close to the first end and has a first preset distance from the first end; Another first vertical slot radiating portion of the multi-mode slot radiator is close to the second end and has a second preset distance from the second end; Wherein, the first preset distance is equal to the second preset distance.

8. The broadband slot antenna according to claim 7, wherein: One of the second vertical slot radiating portions of the multi-mode slot radiator is close to the first end and has a first preset distance from the first end; Another second vertical slot radiating portion of the multi-mode slot radiator is close to the second end and has a second preset distance from the second end; There is a preset gap between a pair of the second vertical slot radiation portions; the first preset spacing is equal to the second preset spacing; The first preset distance is smaller than the first preset spacing.

9. The broadband slot antenna according to claim 6, wherein: The horizontal slot radiation portion has a first slot width, the first vertical slot radiation portion has a second slot width, and the second vertical slot radiation portion has a third slot width; The first gap width, the second gap width and the third gap width are all equal.

10. The broadband slot antenna according to claim 6, wherein: The first vertical slot radiation portion has a first slot length, and the second vertical slot radiation portion has a second slot length; Wherein, the first gap length is smaller than the second gap length.

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