Antenna and communication equipment

Abstract

The embodiment of the utility model relates to the technical field of antennas, and particularly discloses an antenna and communication equipment, and the antenna comprises a dielectric layer, a radiation layer, a feed layer and a radio frequency ground layer. The dielectric layer comprises a first surface and a second surface which are oppositely arranged; the radiation layer is arranged on the first surface, the radiation layer is provided with a first gap and a second gap, and the first gap and the second gap are oppositely arranged; the feed layer is arranged on the first surface, and the feed layer is connected with the radiation layer; the radio frequency ground layer is arranged on the second surface, and the radio frequency ground layer is coupled with the radiation layer and the feed layer. Through the first slot and the second slot in the mode, the embodiment of the utility model can introduce a notch in a specific frequency, so that the antenna has the characteristic of in-band notch, the in-band interference of the antenna in the frequency band is effectively inhibited, the signal quality is improved, the signal coverage range is expanded, and the compatibility is improved.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of antennas, and particularly to an antenna and a communication device. Background Art

[0002] A planar ultra-wideband antenna is an antenna that can operate within an extremely wide frequency range. The planar ultra-wideband antenna is generally designed as a planar structure, which is convenient for integration into different devices. The planar ultra-wideband antenna has characteristics such as high transmission rate, low cost, light weight, simple structure, and easy integration, and is widely used in wireless communication devices.

[0003] In the implementation process of this application, the inventors found that: currently, the planar ultra-wideband antenna does not have the characteristic of in-band notch, and cannot effectively suppress in-band interference, which easily leads to a decrease in signal quality, a reduction in signal coverage, and a decrease in compatibility, restricting its use in wireless communication devices. Summary of the Utility Model

[0004] The main technical problem to be solved by the embodiments of the present utility model is to provide an antenna and a communication device that can overcome or at least partially solve the above problems.

[0005] To solve the above technical problem, one technical solution adopted by the embodiments of the present utility model is: to provide an antenna, including a dielectric layer, a radiation layer, a feeding layer, and a radio frequency ground layer; the dielectric layer includes a first surface and a second surface arranged opposite to each other; the radiation layer is arranged on the first surface, the radiation layer is provided with a first slit and a second slit, and the first slit and the second slit are arranged opposite to each other; the feeding layer is arranged on the first surface, and the feeding layer is connected to the radiation layer; the radio frequency ground layer is arranged on the second surface, and the radio frequency ground layer is coupled to the radiation layer and the feeding layer respectively.

[0006] In some embodiments, the radiation layer has a first edge, a second edge, and a third edge connected in sequence, the second edge is connected to the feeding layer, the first slit extends obliquely from the first edge, and the first slit forms a first opening at the first edge, the second slit extends obliquely from the third edge, and the second slit forms a second opening at the third edge, and the first slit and the second slit are symmetrically arranged with respect to the feeding layer.

[0007] In some embodiments, the radiation layer includes a first radiation patch, a second radiation patch, and a third radiation patch connected in sequence. The first radiation patch and the third radiation patch are symmetrically arranged with respect to the second radiation patch. The first edge is located on the first radiation patch, the second edge is located on the second radiation patch, the third edge is located on the third radiation patch. The first gap extends from the first radiation patch to the second radiation patch, and the second gap extends from the third radiation patch to the second radiation patch.

[0008] In some embodiments, both the first radiation patch and the third radiation patch are trapezoidally arranged, and the second radiation patch is rectangularly arranged.

[0009] In some embodiments, along a first direction, the first gap has a first tilt angle of 135°, the second gap has a second tilt angle of 45°, and the first direction is the direction from the feeding layer to the radiation layer.

[0010] In some embodiments, both the first gap and the second gap are rectangularly arranged.

[0011] In some embodiments, along the first direction, one side of the feeding layer is flush with one side of the dielectric layer, the other side of the feeding layer is connected to the radiation layer, and the side of the radiation layer away from the feeding layer is spaced from the opposite side of the dielectric layer; the feeding layer is symmetrically arranged with respect to the center line of the first surface along a second direction, and the radiation layer is symmetrically arranged with respect to the center line of the dielectric layer along the second direction, and the second direction is perpendicular to the first direction.

[0012] In some embodiments, along the first direction, one side of the RF ground layer is flush with one side of the dielectric layer, and the opposite side of the RF ground layer is spaced from the opposite side of the dielectric layer; along the second direction, the RF ground layer is symmetrically arranged with respect to the center line of the dielectric layer.

[0013] In some embodiments, the antenna has a notch center frequency, and the relationship between the notch center frequency and the first gap is:

[0014]

[0015]

[0016] where f N is the notch center frequency, C is the speed of light in a vacuum, ε r is the dielectric constant of the medium, and L S is the length of the first gap.

[0017] To solve the above technical problems, another technical solution adopted in the embodiments of the present utility model is: to provide a communication device including the above antenna.

[0018] The beneficial effects of the embodiments of the present utility model are as follows: Different from the prior art, the embodiments of the present utility model provide an antenna, which includes a dielectric layer, a radiation layer, a feeding layer, and a radio frequency ground layer; the dielectric layer includes a first surface and a second surface arranged opposite to each other; the radiation layer is disposed on the first surface, and the radiation layer is provided with a first slit and a second slit, and the first slit and the second slit are arranged opposite to each other; the feeding layer is disposed on the first surface, and the feeding layer is connected to the radiation layer; the radio frequency ground layer is disposed on the second surface, and the radio frequency ground layer is coupled to the radiation layer and the feeding layer respectively. Through the first slit and the second slit in the above manner, the embodiments of the present utility model can introduce a notch within a specific frequency, making it have the characteristic of in-band notch, effectively suppressing the in-band interference within this frequency band, improving the signal quality, expanding the signal coverage range, and improving the compatibility. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the specific embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0020] Figure 1 is the overall structural schematic diagram of the antenna provided by the embodiments of the present utility model Figure 1 ;

[0021] Figure 2 is the overall structural schematic diagram of the antenna provided by the embodiments of the present utility model Figure 2 ;

[0022] Figure 3 is the overall structural schematic diagram of the antenna provided by the embodiments of the present utility model Figure 3 ;

[0023] Figure 4 is the parameter schematic diagram of the simulation example of the antenna provided by the embodiments of the present utility model Figure 1 ;

[0024] Figure 5 is the parameter schematic diagram of the simulation example of the antenna provided by the embodiments of the present utility model Figure 2 ;

[0025] Figure 6 is the relationship diagram of the standing wave ratio of the simulation example of the antenna provided by the embodiments of the present utility model changing with different L S ;

[0026] Figure 7 is the graph of the relationship between the standing wave ratio and different W of the simulation example of the antenna provided by the embodiment of the present utility model; S ;

[0027] Figure 8 is the graph of the relationship between the standing wave ratio and different L of the simulation example of the antenna provided by the embodiment of the present utility model; G ;

[0028] Figure 9 is the graph of the simulation result of the standing wave ratio of the preferred simulation example of the antenna provided by the embodiment of the present utility model;

[0029] Figure 10 is the graph of the simulation results of the maximum gain and radiation efficiency of the preferred simulation example of the antenna provided by the embodiment of the present utility model;

[0030] Figure 11 is the radiation pattern of the preferred simulation example of the antenna provided by the embodiment of the present utility model at 4.5 GHz;

[0031] Figure 12 is the radiation pattern of the preferred simulation example of the antenna provided by the embodiment of the present utility model at 8.5 GHz;

[0032] Figure 13 is the radiation pattern of the preferred simulation example of the antenna provided by the embodiment of the present utility model at 12.5 GHz.

[0033] Description of reference numerals:

[0034] 1 dielectric layer, 11 first surface, 12 second surface;

[0035] 2 radiation layer, 21 first slit, 211 first opening, 22 second slit, 221 second opening, 23 first edge, 24 second edge, 25 third edge, 26 first radiation patch, 27 second radiation patch, 28 third radiation patch;

[0036] 3 feeding layer;

[0037] 4 RF ground layer;

[0038] X first direction, Y second direction. Detailed implementation manners

[0039] For the convenience of understanding the present utility model, the present utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is expressed as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0040] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in this specification in the description of the present utility model are only for the purpose of describing specific embodiments and are not used to limit the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0041] A planar ultra-wideband antenna is an antenna that can operate within an extremely wide frequency range. The planar ultra-wideband antenna is generally designed as a planar structure, which is convenient for integration into different devices. The planar ultra-wideband antenna has the characteristics of high transmission rate, low cost, light weight, simple structure, and easy integration, and is widely used in wireless communication devices.

[0042] During the implementation of this application, the inventors found that: currently, the planar ultra-wideband antenna does not have the characteristic of in-band notch, and cannot effectively suppress in-band interference, which easily leads to a decrease in signal quality, a reduction in signal coverage, and a decrease in compatibility, restricting its use in wireless communication devices.

[0043] In view of this, the present utility model provides an embodiment of an antenna, which can have the characteristic of in-band notch, effectively suppress in-band interference within this frequency band, improve signal quality, expand signal coverage, and improve compatibility.

[0044] For the above antenna, please refer to Figures 1 to 3, the antenna includes a dielectric layer 1, a radiation layer 2, a feeding layer 3, and a radio frequency ground layer 4; the dielectric layer 1 includes a first surface 11 and a second surface 12 arranged oppositely; the radiation layer 2 is arranged on the first surface 11, the radiation layer 2 is provided with a first slot 21 and a second slot 22, and the first slot 21 and the second slot 22 are arranged oppositely; the feeding layer 3 is arranged on the first surface 11, and the feeding layer 3 is connected to the radiation layer 2; the radio frequency ground layer 4 is arranged on the second surface 12, and the radio frequency ground layer 4 is coupled to the radiation layer 2 and the feeding layer 3 respectively. Through the arrangement of the above-mentioned first slot 21 and second slot 22, resonance can be formed at a specific frequency of the antenna, and then a notch can be introduced within the specific frequency of the antenna, so that the antenna has the characteristic of notch in the band.

[0045] Specifically, along the first direction X, one side of the feeding layer 3 is flush with one side of the dielectric layer 1, the other side of the feeding layer 3 is connected to the radiation layer 2, the side of the radiation layer 2 away from the feeding layer 3 is spaced from the opposite side of the dielectric layer 1, the feeding layer 3 is symmetrically arranged about the center line of the first surface 11 along the second direction Y, the radiation layer 2 is symmetrically arranged about the center line of the dielectric layer 1 along the second direction Y, the first direction X is the direction from the feeding layer 3 to the radiation layer 2, and the second direction Y is perpendicular to the first direction X; along the first direction X, one side of the radio frequency ground layer 4 is flush with one side of the dielectric layer 1, and the opposite side of the radio frequency ground layer 4 is spaced from the opposite side of the dielectric layer 1; along the second direction Y, the radio frequency ground layer 4 is symmetrically arranged about the center line of the dielectric layer 1.

[0046] It should be noted that the radiation performance of the above antenna is determined by the size parameters of the radiation layer 2, the bandwidth and reflection coefficient of the above antenna are jointly determined by the length of the radio frequency ground layer 4 and the size parameters of the radiation layer 2, and the center frequency of the notch in the band and the isolation degree at the center frequency of the notch in the band are jointly determined by the size parameters of the first slot 21 and the second slot 22 and the length of the radio frequency ground layer 4. It should also be noted that the feeding layer 3 includes but is not limited to a 50Ω microstrip feeder, the radiation layer 2 includes but is not limited to a radiation patch, and the radio frequency ground layer 4 includes but is not limited to a metal patch.

[0047] Please refer to Figures 1 to 3 , the radiation layer 2 has a first edge 23, a second edge 24, and a third edge 25 connected in sequence, the second edge 24 is connected to the feeding layer 3, the first slot 21 extends obliquely from the first edge 23, and the first slot 21 forms a first opening 211 at the first edge 23, the second slot 22 extends obliquely from the third edge 25, and the second slot 22 forms a second opening 221 at the third edge 25, and the first slot 21 and the second slot 22 are symmetrically arranged about the feeding layer 3.

[0048] Among them, the first slot 21 and the second slot 22 are symmetrically arranged with respect to the feeding layer 3, which helps to make the characteristics of the in-band notch formed by the first slot 21 and the second slot 22 more stable and controllable. In addition, through the settings of the first opening 211 and the second opening 221, not only can the propagation of electromagnetic waves in the radiation layer 2 be guided, thereby changing the distribution of the electric field, so that resonance at a specific frequency is generated in the first slot 21 and the second slot 22 through the concentration and scattering effects of the electric field to achieve the notch effect, but also the two ends of the first slot 21 and the second slot 22 can effectively interrupt or adjust the current path, and then a strong electromagnetic resonance effect is formed at the first slot 21 and the second slot 22, which helps to generate an obvious in-band notch.

[0049] Please refer to Figures 1 to 3 , the radiation layer 2 includes a first radiation patch 26, a second radiation patch 27, and a third radiation patch 28 connected in sequence. The first radiation patch 26 and the third radiation patch 28 are symmetrically arranged with respect to the second radiation patch 27. The first edge 23 is located on the first radiation patch 26, the second edge 24 is located on the second radiation patch 27, the second radiation patch is symmetrically arranged with respect to the feeding layer 3, the third edge 25 is located on the third radiation patch 28, the first slot 21 extends from the first radiation patch 26 to the second radiation patch 27, and the second slot 22 extends from the third radiation patch 28 to the second radiation patch 27.

[0050] Among them, through the symmetric arrangement of the first radiation patch 26 and the third radiation patch 28 with respect to the second radiation patch 27, and the symmetric arrangement of the second radiation patch with respect to the feeding layer 3, the electromagnetic coupling of the first radiation patch 26, the second radiation patch 27, and the third radiation patch 28 can be enhanced, making the resonance effect stronger, thereby deepening the notch characteristics.

[0051] In some embodiments, please refer to Figures 1 to 3 , both the first radiation patch 26 and the third radiation patch 28 are trapezoidally arranged, the second radiation patch is rectangularly arranged, and both the first slot 21 and the second slot 22 are rectangularly arranged. By the above method, the resonance characteristics of the first slot 21 and the second slot 22 can be optimized, and then the position and depth of the notch frequency can be affected.

[0052] In some embodiments, please refer to Figures 1 to 3 , along the first direction X, the first slot 21 has a first inclination angle of 135°, the second slot 22 has a second inclination angle of 45°. By the above method, the resonance characteristics of the first slot 21 and the second slot 22 can be further optimized, and then the position and depth of the notch frequency can be affected.

[0053] For the above antenna, the antenna has an in-band notch center frequency, and the relationship between the in-band notch center frequency and the first slot 21 / second slot 22 is as follows:

[0054]

[0055]

[0056] where f N is the notch center frequency, C is the speed of light in a vacuum, ε r is the dielectric constant of dielectric layer 1, and L S is the length of the first slot 21 / second slot 22.

[0057] To verify the concept of the antenna of the embodiment of the present invention, the following simulation examples are provided:

[0058] Please refer to Figure 4 and Figure 5 , which show the layout size parameter description of the simulation example. Among them, the dielectric constant of dielectric layer 1 is 3.38, the dielectric loss is 0.0022, and the thickness is 0.762 mm; the RF ground layer 4 is copper-plated with a thickness of 0.035 mm. In addition, L P is the length of dielectric layer 1, W P is the width of dielectric layer 1 or RF ground layer 4, L G is the length of RF ground layer 4, H R is the height of the rectangular radiation patch (i.e., the second radiation patch 27), H T is the height of the trapezoidal radiation patch (i.e., the first radiation patch 26 or the second radiation patch 27), L R is the length of the rectangular radiation patch (i.e., the second radiation patch 27) or the long side length of the trapezoidal radiation patch (i.e., the first radiation patch 26 or the second radiation patch 27), L T is the short side length of the trapezoidal radiation patch (i.e., the first radiation patch 26 or the second radiation patch 27), L S is the length of the narrow rectangular slot (i.e., the first slot 21 or the second slot 22), W S is the width of the narrow rectangular slot (i.e., the first slot 21 or the second slot 22), L F is the length of the microstrip feeder with a characteristic impedance of 50 Ω (i.e., the feeding layer 3), W F is the width of the microstrip feeder with a characteristic impedance of 50 Ω (i.e., the feeding layer 3).

[0059] Please refer to Figures 6 to 8 , which shows the size parameters of the narrow rectangular slot (i.e., the first slot 21 or the second slot 22) (i.e., L S and W S ) and the length of the RF ground layer 4 (i.e., L G) Influence on the center frequency of the in-band notch and the isolation at the center frequency of the in-band notch. In addition, the figure shows that the above antenna has the characteristic of in-band notch.

[0060] Specifically: First, from Figure 6 it can be seen that as the parameter L S increases, near the frequency less than the notch center frequency, its voltage standing wave ratio (VSWR) increases; near the frequency greater than the notch center frequency, its VSWR decreases; the passband bandwidth decreases; the notch center frequency shifts downward, and the isolation at the notch center frequency increases. Second, from Figure 7 it can be seen that as the parameter W S increases, in the passband with a frequency less than the notch center frequency, its VSWR slightly increases; in the passband with a frequency greater than the notch center frequency, its VSWR slightly decreases; the passband bandwidth slightly increases; the notch center frequency slightly shifts downward, and the isolation at the notch center frequency slightly increases. Third, from Figure 8 it can be seen that as the parameter L G increases, in the passband, the VSWR decreases; the passband bandwidth increases; the notch center frequency remains almost unchanged, and the isolation at the notch center frequency increases.

[0061] According to the influence of the size parameters (i.e., L Figures 6 to 8 and W S ) of the narrow rectangular slot (i.e., the first slot 21 or the second slot 22) shown above and the length of the RF ground layer 4 (i.e., L S ) on the center frequency of the in-band notch and the isolation at the center frequency of the in-band notch, by optimizing the antenna parameters, the preferred simulation examples of the antenna can be obtained, and the parameters are as follows: L G = 30.0 mm, W P = 30.0 mm, L P = 9.5 mm, H R = 12.0 mm, H T = 8.0 mm, L R = 19.0 mm, L T = 3.0 mm, L S = 8.0 mm, W S = 0.4 mm, L F = 10.0 mm, W F = 1.8 mm.

[0062] Figure 9 Figure 9 shows the reflection coefficient of the preferred simulation example of the antenna. From Figure 9It can be seen that the bandwidth range with a standing wave ratio less than 2 is 3.22 GHz - 13.58 GHz, the center frequency is 8.4 GHz, the absolute bandwidth is 10.38 GHz, and the relative bandwidth is 123.3%, showing ultra-wideband characteristics; within the passband, there are also three transmission poles located at 3.81 GHz, 9.25 GHz, and 11.59 GHz respectively, ensuring the flatness of the maximum gain and radiation efficiency within the passband; there is also a transmission zero at the notch, located at 6.9 GHz, which can effectively suppress the in-band interference at this frequency.

[0063] Figure 10 The figure shows the simulation results of the maximum gain and radiation efficiency of the preferred simulation example of the antenna. From Figure 10 It can be seen that within the passband, its average maximum gain is 4.04 dBi, showing the advantage of high maximum gain; within the passband, its average radiation efficiency is 97.2%, showing the advantage of high radiation efficiency; there is a notch at 6.9 GHz, and the maximum gain at the center frequency of the notch is only -3.96 dB, and the radiation efficiency is 21%, indicating the characteristic of high isolation.

[0064] Figure 11 、 Figure 12 and Figure 13 The figure shows the radiation patterns of the preferred simulation example of the antenna at 4.5 GHz, 8.5 GHz, and 12.5 GHz. From Figure 11 、 Figure 12 and Figure 13 It can be seen that the preferred simulation example of the antenna is an omnidirectional antenna.

[0065] An embodiment of the present invention provides an antenna, including a dielectric layer 1, a radiation layer 2, a feeding layer 3, and a radio frequency ground layer 4; the dielectric layer 1 includes a first surface 11 and a second surface 12 arranged opposite to each other; the radiation layer 2 is arranged on the first surface 11, and the radiation layer 2 is provided with a first slot 21 and a second slot 22, and the first slot 21 and the second slot 22 are arranged opposite to each other; the feeding layer 3 is arranged on the first surface 11, and the feeding layer 3 is connected to the radiation layer 2; the radio frequency ground layer 4 is arranged on the second surface 12, and the radio frequency ground layer 4 is coupled to the radiation layer 2 and the feeding layer 3 respectively. Through the first slot 21 and the second slot 22 in the above manner, the embodiment of the present invention can introduce a notch within a specific frequency, making it have the characteristic of in-band notch, effectively suppressing the in-band interference within this frequency band, improving the signal quality, expanding the signal coverage range, and improving the compatibility.

[0066] The embodiment of the present invention further provides an embodiment of a communication device, including the above antenna. For the specific structure and function of the above antenna, reference can be made to the above embodiment, and details will not be repeated here.

[0067] The above are only embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present utility model.

Claims

1. An antenna, characterized in that, Comprising: A dielectric layer including a first surface and a second surface disposed opposite to each other; A radiation layer disposed on the first surface, the radiation layer being provided with a first slot and a second slot, the first slot and the second slot being disposed opposite to each other; A feeding layer disposed on the first surface, the feeding layer being connected to the radiation layer; A radio frequency ground layer disposed on the second surface, the radio frequency ground layer being coupled to the radiation layer and the feeding layer respectively.

2. The antenna according to claim 1, wherein: The radiation layer has a first edge, a second edge and a third edge connected in sequence, the second edge is connected to the feeding layer, the first slot extends obliquely from the first edge, and the first slot forms a first opening at the first edge, the second slot extends obliquely from the third edge, and the second slot forms a second opening at the third edge, the first slot and the second slot are symmetrically disposed with respect to the feeding layer.

3. The antenna according to claim 2, wherein: The radiation layer includes a first radiation patch, a second radiation patch and a third radiation patch connected in sequence, the first radiation patch and the third radiation patch are symmetrically disposed with respect to the second radiation patch, the first edge is located on the first radiation patch, the second edge is located on the second radiation patch, the third edge is located on the third radiation patch, the first slot extends from the first radiation patch to the second radiation patch, the second slot extends from the third radiation patch to the second radiation patch.

4. The antenna according to claim 3, wherein: Both the first radiation patch and the third radiation patch are trapezoidally arranged, and the second radiation patch is rectangularly arranged.

5. The antenna according to claim 4, wherein: Along a first direction, the first slot has a first inclination angle of 135°, the second slot has a second inclination angle of 45°, and the first direction is the direction from the feeding layer to the radiation layer.

6. The antenna according to claim 5, wherein: Both the first slot and the second slot are rectangularly arranged.

7. The antenna according to claim 6, wherein: Along the first direction, one side of the feeding layer is flush with one side of the dielectric layer, the other side of the feeding layer is connected to the radiation layer, and the side of the radiation layer away from the feeding layer is spaced from the opposite side of the dielectric layer; The feeding layer is symmetrically disposed about the center line of the first surface in a second direction, and the radiation layer is symmetrically disposed about the center line of the dielectric layer in the second direction, and the second direction is perpendicular to the first direction.

8. The antenna according to claim 7, wherein: Along the first direction, one side of the radio frequency ground layer is flush with one side of the dielectric layer, and the opposite side of the radio frequency ground layer is spaced from the opposite side of the dielectric layer; Along the second direction, the radio frequency ground layer is symmetrically disposed about the center line of the dielectric layer.

9. The antenna according to claim 8, wherein the antenna has a notch center frequency, and the relationship between the notch center frequency and the first slot is: where f N is the notch center frequency, C is the speed of light in vacuum, ε r is the dielectric constant of the medium, L S is the length of the first slit.

10. A communication device, characterized in that, Comprising the antenna according to any one of claims 1-9.

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