Broadband antenna with notch characteristic

Abstract

The invention belongs to the technical field of antennas, and relates to a broadband antenna with a notch characteristic, which comprises a dielectric substrate, a patch layer arranged on the upper surface of the dielectric substrate and a floor layer arranged on the lower surface of the dielectric substrate, the patch layer comprises a microstrip line and a first branch knot; the microstrip line is of a rectangular structure, one short side of the rectangular structure is connected with one short side of the dielectric substrate, and the distances between the two long sides of the rectangular structure and the two long sides of the dielectric substrate are different; the microstrip line is provided with a T-shaped groove. The first branch knot is of an L-shaped structure, and the L-shaped structure is arranged between the microstrip line and one long edge of the dielectric substrate. According to the invention, the bandwidth of the planar slot antenna can be expanded, and the antenna has a wide notch characteristic.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a broadband antenna with notch characteristics. Background Art

[0002] With the continuous development and rapid progress of science and technology, antennas, the core components in the field of wireless communications, are also keeping pace with the times and evolving.

[0003] Among them, slot antenna, also known as slot antenna, is an antenna formed by slotting on the conductor surface. Its typical shape is a long strip with a length of about half a wavelength. Slot antenna radiates electromagnetic waves to the external space through the slot. It has the characteristics of low profile, good flat-mount structure, and easy conformity with the installation object. It is widely used in radar, navigation, electronic countermeasures, communications and other fields, and is an important component in modern wireless communication systems.

[0004] In the prior art, a planar slot antenna is a slot antenna in a specific shape (such as a strip, rectangle, circle, etc.) made on a planar conductor plate or dielectric substrate through precision machining technology. This type of antenna uses the slot on the conductor plate or dielectric substrate as a radiation unit, and effectively transmits electromagnetic wave energy into space through the leakage and radiation principles of electromagnetic waves. Planar slot antennas have the advantages of low profile, easy integration, light weight, and compact structure. They can achieve good conformality with the surrounding environment while maintaining high gain and directivity. Therefore, they have been widely used in wireless communications, radar detection, satellite communications, microwave measurement, electronic countermeasures and other fields. In addition, planar slot antennas also have good frequency stability and anti-interference capabilities, and are one of the indispensable key components in modern wireless communication systems and high-performance electronic devices.

[0005] However, current planar slot antennas mainly face the following problems: 1) Traditional planar slot antennas are narrowband antennas with narrow bandwidth, which can only receive limited signals, thus affecting the normal operation of the communication system. However, in view of the increasing number of wireless communication applications and the increasingly complex communication environment, antennas need to have a wider bandwidth to effectively capture signals; 2) The antenna only has a notch frequency point, or the notch frequency band is narrow and cannot suppress more interference signals, resulting in unstable communication system. Summary of the invention

[0006] Based on this, it is necessary to provide a broadband antenna with a notch characteristic to address the above technical problems, which can expand the bandwidth of the planar slot antenna and have a wide notch characteristic.

[0007] A broadband antenna with a notch characteristic, comprising: a dielectric substrate, a patch layer arranged on the upper surface of the dielectric substrate, and a floor layer arranged on the lower surface of the dielectric substrate; The patch layer includes: a microstrip line and a first branch; The microstrip line is a rectangular structure, one short side of the rectangular structure is connected to one short side of the dielectric substrate, and the distances between the two long sides of the rectangular structure and the two long sides of the dielectric substrate are different; a "T"-shaped groove is provided on the microstrip line; The first branch is an "L"-shaped structure, and the "L"-shaped structure is arranged between the microstrip line and a long side of the dielectric substrate.

[0008] In one embodiment, the “T”-shaped slot is an asymmetric structure.

[0009] In one embodiment, the ratio of the long side to the short side of the “L” shaped structure is greater than 7.

[0010] In one embodiment, the patch layer further includes: a second branch disposed at intervals from the microstrip line; The second branch includes: a first part, a second part, a third part and a fourth part; The first part is an "E"-shaped structure, and the "E"-shaped structure includes: a first side, a second side, a third side and a fourth side; one end, a middle part and the other end of the first side are respectively connected to the second side, the third side and one end of the fourth side; the second side is arranged between the third side and the microstrip line; The second part is a strip-shaped structure, one end of which is connected to the other end of the first side and is colinear with the fourth side, and the other end of which is connected to the third part; The third part is a "convex"-shaped structure lacking a bottom edge; The fourth part is composed of three circular structures of equal size, the first circular structure is connected to the other end of the fourth side, and the second circular structure and the third circular structure are respectively connected to the two ends of the third part.

[0011] In one embodiment, the patch layer further includes: a third branch node spaced apart from the microstrip line and the second branch node; The third branch includes: a first component, a second component, a third component and a fourth component; The first component is a "U"-shaped structure, and the "U"-shaped structure includes: a first line, a second line and a third line; the first line is arranged parallel to the microstrip line and spaced apart, and two ends of the first line are respectively connected to one end of the second line and one end of the third line; The second component is a rectangular structure, one end of which is connected to the other end of the second line; The third component is three strip structures of unequal lengths, and one corresponding end is connected to the other long side of the second component; The fourth component is three equal-sized circular structures connected to the other corresponding end of the third component. In one embodiment, an I-shaped groove is provided on the second component.

[0012] In one embodiment, the third component corresponds to the fourth component one by one, a third component and a corresponding fourth component form a parasitic structure, and each parasitic structure is provided with a strip groove.

[0013] In one embodiment, the floor layer is provided with: a first groove; The first groove includes: a first section, a second section, a third section and a fourth section, all of which are strip-shaped structures; One end of the first section is connected to the middle of a long side of the dielectric substrate, and the other end extends toward the center of the lower surface of the dielectric substrate; One end of the second segment is vertically connected to the other end of the first segment; The third section and the fourth section are arranged in parallel and at intervals, one corresponding end is connected to the middle of the first section, and the other corresponding end extends in the opposite direction of the second section.

[0014] In one embodiment, the floor layer is further provided with: a second groove spaced apart from the first groove; The second groove includes: a first piece, a second piece, a third piece, a fourth piece and a fifth piece; The first sheet is a circular structure and is spaced apart from the first groove; The second sheet is a strip-shaped structure, one end of which is connected to the first sheet, and the other end of which is connected to the middle of the third sheet; The third sheet is a strip-shaped structure, one end of which is connected to the fourth sheet; The fourth piece is two "L"-shaped structures, which are sequentially connected to form a stepped structure, one end of the stepped structure is connected to one end of the third piece, and the other end is spaced apart from the fourth section; The fifth sheet is a strip-shaped structure, one end of which is connected to the intersection of the second sheet and the third sheet, and the other end of which extends toward the other end of the third sheet.

[0015] In one embodiment, the floor layer is further provided with: a third groove spaced apart from the first groove and the second groove; The third groove includes: a first belt, a second belt and a third belt, all of which are strip-shaped structures; One end of the first belt is connected to a long side of the dielectric substrate, and the other end extends along the short side of the dielectric substrate and is spaced apart from the third section and the fourth section; One end of the second belt is connected to the middle of the other long side of the dielectric substrate, and the other end extends along the short side of the dielectric substrate and is spaced apart from the fourth sheet; One end of the third belt is connected to the other long side of the dielectric substrate, and the other end extends along the short side direction of the dielectric substrate and is spaced apart from the third sheet and the fifth sheet.

[0016] The broadband antenna with notch characteristics is designed with a microstrip line and a first branch to realize a notch frequency band and broadband characteristics; the second branch and the third branch are designed to realize notches in three different frequency bands, and expand the bandwidth of the antenna notch frequency band, so that the notches in the three different frequency bands all have wide frequency bands (i.e., wide notches are realized); the first groove and the second groove are designed on the floor to realize ultra-wideband; the third groove is designed on the floor to realize miniaturization. Finally, the present application realizes an ultra-wideband slot antenna with multiple wide notch characteristics. The antenna has a wide working frequency band and ultra-wideband characteristics. It can receive signals in more frequency bands, increase antenna utilization, and expand application scenarios. The antenna has a wide notch frequency band and has three notch characteristics. It can more effectively suppress interference signals in more frequency bands. It has wide notch characteristics, can improve notch frequency band characteristics, and better suppress interference signals. The antenna is small in size and has miniaturization characteristics. It has a simple structure, is easy to make, and has low processing costs. The antenna of the present application is an ultra-wideband antenna with wide notch characteristics. It has the ability to suppress interference signals with a wideband, which is beneficial to the stability of transmission and the operation of the communication system, and realizes high-efficiency and accurate transmission. It can be applied to wireless communication systems, base stations, the Internet of Things, the Internet of Vehicles and other fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional schematic diagram of a broadband antenna with notch characteristics in one embodiment; Figure 2 is another three-dimensional schematic diagram of a broadband antenna with notch characteristics in one embodiment; Figure 3 is a top view of a broadband antenna with notch characteristics in one embodiment; Figure 4 is a bottom view of a broadband antenna with notch characteristics in one embodiment; Figure 5 : S of a broadband antenna with a notch characteristic in an embodiment when the first groove, the second groove and the third groove are not provided on the floor layer 11 Schematic diagram of the curve; Figure 6 1 is a broadband antenna with a notch characteristic in an embodiment, and S is when a first groove, a second groove and a third groove are set in a floor layer. 11 Schematic diagram of the curve; Figure 7 is a schematic diagram of a VSWR curve of a broadband antenna with a notch characteristic in one embodiment; Figure 8 is a schematic diagram of a gain curve of a broadband antenna with a notch characteristic in one embodiment; Fig. 9 is an E-plane radiation pattern of a broadband antenna with notch characteristics at 5.3 GHz in one embodiment; Fig.10 is an E-plane radiation pattern of a broadband antenna with notch characteristics at 7.1 GHz in an embodiment; Fig.11 FIG. 1 is an E-plane radiation pattern of a broadband antenna with notch characteristics at 9.2 GHz in an embodiment.

[0018] Reference numerals: Dielectric substrate 1; Patch layer 2, first branch 21, second branch 22, third branch 23, microstrip line 24; The floor layer 3 has a first groove 31 , a second groove 32 and a third groove 33 . DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0020] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "multiple groups" means at least two groups, such as two groups, three groups, etc., unless otherwise clearly and specifically defined.

[0022] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0024] The present application provides a broadband antenna with notch characteristics, such as Figure 1 and Figure 2 As shown, in one embodiment, it includes: a dielectric substrate, a patch layer and a floor layer. The dielectric substrate is a load-bearing unit, providing a loading space for the patch layer and the floor layer.

[0025] The patch layer is a radiation unit, which is arranged on the upper surface of the dielectric substrate. The patch layer includes: a microstrip line and a first branch, which are coupled to form a notch frequency band; the microstrip line is a rectangular structure, one short side of the rectangular structure is connected to one short side of the dielectric substrate, the other short side of the rectangular structure is spaced apart from the other short side of the dielectric substrate, the two long sides of the rectangular structure are spaced apart from the two long sides of the dielectric substrate, and the distances between the two long sides of the rectangular structure and the two long sides of the dielectric substrate are different, that is, the microstrip line is offset; a "T"-shaped slot is provided on the microstrip line; the first branch is an "L"-shaped structure, and the "L"-shaped structure is arranged between the microstrip line and one long side of the dielectric substrate.

[0026] The floor layer is a grounding unit and is arranged on the lower surface of the dielectric substrate.

[0027] Preferably, the "T"-shaped slot is an asymmetric structure, so that multiple independent resonance areas are formed inside the antenna, each resonance area has a corresponding resonance frequency and radiation characteristics. When these resonance areas are excited at the same time, a superposition effect will occur, thereby forming multiple resonance modes in the total radiation field of the antenna. These resonance modes are superimposed on each other, which can enhance the bandwidth performance of the antenna, increasing the bandwidth by 28% over the previous bandwidth, and achieving ultra-wideband.

[0028] Further preferably, the ratio of the long side to the short side of the "L"-shaped structure is greater than 7, so as to expand the frequency band of the notch and improve the notch characteristics, so that the peak of the notch is closer to 0 and the notch performance is better.

[0029] In one embodiment, the patch layer further includes: a second branch; the second branch is spaced apart from the microstrip line so that the microstrip line is disposed between the first branch and the second branch; the second branch includes: a first part, a second part, a third part and a fourth part.

[0030] The first part is an "E"-shaped structure; the "E"-shaped structure includes: a first side, a second side, a third side and a fourth side; one end, a middle part and the other end of the first side are respectively connected to one end of the second side, the third side and the fourth side; the second side is arranged between the third side and the microstrip line, and the length of the second side is greater than the length of the first side, the third side and the fourth side, and the length of the third side is equal to the fourth side.

[0031] The second part is a strip structure, one end of which is connected to the other end of the first side and is colinear with the fourth side, and the other end of which is connected to the third part.

[0032] The third part is a strip structure that is bent multiple times to form a "convex"-shaped structure that lacks a bottom edge. The steps on both sides of the "convex"-shaped structure are not of the same height to form an asymmetrical structure.

[0033] The fourth part is composed of three circular structures of equal size, the first circular structure is connected to the other end of the fourth side, and the second circular structure and the third circular structure are connected to the two ends of the third part respectively.

[0034] The first side, the second side, the third side, the fourth side, the second portion and the third portion are of equal width.

[0035] In the above setting, coupling is generated between the first part and the microstrip line, so that the current at the notch frequency is concentrated on the first part, and the electromagnetic wave cannot radiate out, forming a new notch; the second and third parts increase the flow path of the current and change the flow direction and distribution of the current, thereby expanding the notch frequency band and suppressing more interference signals; the fourth part allows the current to flow through the edge of the circle, so that the current transitions smoothly at the edge of the circle, thereby further expanding the notch frequency band, and the notch is increased by 8% compared with before.

[0036] Preferably, the patch layer further includes: a third branch; the third branch is spaced apart from the microstrip line, so that the microstrip line is arranged between the first branch and the third branch, and the third branch is also spaced apart from the second branch; the third branch includes: a first component, a second component, a third component and a fourth component.

[0037] The first component is a "U"-shaped structure, and the "U"-shaped structure includes: a first line, a second line and a third line, and the first line, the second line and the third line are of equal width; the first line is arranged in parallel with the microstrip line, and its two ends are respectively vertically connected to one end of the second line and the third line, and the third line is arranged in parallel with a short side of the dielectric substrate.

[0038] The second component is a rectangular structure, one end of which is connected to the other end of the second line, and the other end extends in the opposite direction of the microstrip line and is spaced apart from a long side of the dielectric substrate; a long side of the second component is spaced apart and parallel to the third line; the length of the second component is less than the length of the third line.

[0039] The third component is three strip structures of unequal lengths but equal widths, one corresponding end of which is connected to the other long side of the second component, and the other corresponding end of which extends vertically toward the direction of the second branch.

[0040] The fourth component is three equal-sized circular structures connected to the other corresponding end of the third component. In the above setting, coupling is generated between the first component and the microstrip line, so that the current is concentrated on the first component at the notch frequency point, thereby realizing another new notch; the second component changes the flow direction and path of the current, and forms a new notch frequency point near the notch point generated by the first component. The two are combined to achieve the expansion of the notch frequency band; the third component and the fourth component allow the current to smoothly transition when flowing through the circular edge, thereby achieving the expansion of the notch frequency band.

[0041] Further preferably, an "I"-shaped groove is provided on the second component to further expand the notch frequency band.

[0042] Further preferably, the third component corresponds to the fourth component one by one, and a third component and the corresponding fourth component form a parasitic structure, and each parasitic structure is respectively provided with a strip groove, and the strip groove extends from one end of the third component along the length direction of the third component to the corresponding fourth component, and the widths of the three strip grooves are all smaller than the width of the third component, and the lengths of the three strip grooves are different (specifically: the closer the strip groove is to the microstrip line, the shorter the length; the strip groove in the middle runs through the entire parasitic structure, and the other ends of the strip grooves on both sides extend to the middle of the corresponding fourth component) to further increase the current flow path and improve the notch characteristics of the antenna, which is conducive to the antenna to better suppress interference signals, and can also move the notch frequency band to low frequency, isolate it from other notch frequency points, avoid mutual influence, and the notch is increased by 30% than before.

[0043] In one embodiment, the floor layer is provided with: a first groove; the first groove includes: a first section, a second section, a third section and a fourth section, and the first section, the second section, the third section and the fourth section are all strip structures and have the same width.

[0044] One end of the first section is vertically connected to the middle of a long side of the dielectric substrate, and the other end extends toward the center of the lower surface of the dielectric substrate.

[0045] One end of the second section is vertically connected to the other end of the first section.

[0046] The third section and the fourth section are arranged in parallel and at intervals, one corresponding end is vertically connected to the middle of the first section, and the other corresponding end extends in the opposite direction of the second section.

[0047] In the above configuration, the first section can realize a narrowband resonant frequency of the antenna; the second section, the third section and the fourth section can change the current path, thereby realizing an increase in the resonant frequency and further expanding the bandwidth of the frequency band.

[0048] Preferably, the floor layer is further provided with: a second groove; the second groove is spaced apart from the first groove, and includes: a first piece, a second piece, a third piece, a fourth piece and a fifth piece.

[0049] The first piece is a circular structure and is spaced apart from the first groove.

[0050] The second sheet is a strip structure, one end of which is connected to the first sheet, and the other end of which is vertically connected to the middle of the third sheet. The second sheet is arranged parallel to the short side of the dielectric substrate.

[0051] The third piece is a strip structure, one end of which is connected to the fourth piece, and the other end of which extends in the opposite direction of the fourth piece.

[0052] The fourth piece is two "L" shaped structures, which are connected in sequence and have the same width to form a stepped structure. One end of the stepped structure is connected to one end of the third piece, and the other end is spaced apart from the second section and the fourth section.

[0053] The fifth piece is a strip structure, one end of which is vertically connected to the second piece, and the other end extends in the opposite direction of the fourth piece. The length of the fifth piece is smaller than that of the third piece, and one long side of the fifth piece is collinear with one long side of the third piece.

[0054] It should be noted that the first piece is arranged below the corresponding microstrip line.

[0055] In the above setting, the first piece allows the current to pass through the edge of the circular groove, thereby achieving a smooth transition and further expanding the antenna frequency band; the second piece, the third piece, the fourth piece and the fifth piece can introduce multiple new resonance modes, and these new resonance modes interact with the original resonance modes, thereby further expanding the antenna frequency band and increasing the bandwidth of the ultra-wideband by 330% compared to the narrowband bandwidth of the prior art.

[0056] Further preferably, the floor layer is further provided with: a third groove; the third groove is spaced apart from the first groove and the second groove, and comprises: a first belt, a second belt and a third belt, the first belt, the second belt and the third belt are all strip structures, and are spaced apart and parallel to the short side of the dielectric substrate.

[0057] One end of the first belt is connected to a long side of the dielectric substrate, and the other end extends along the short side of the dielectric substrate and is spaced apart from the third section and the fourth section.

[0058] One end of the second belt is connected to the middle of the other long side of the dielectric substrate, and the other end extends along the short side of the dielectric substrate and is spaced apart from the fourth sheet.

[0059] One end of the third belt is connected to the other long side of the dielectric substrate, and the other end extends along the short side direction of the dielectric substrate and is spaced apart from the third sheet and the fifth sheet.

[0060] The above setting increases the path for current to flow through the edge, thereby miniaturizing the antenna. The size of the antenna is reduced by 20% compared to before.

[0061] The broadband antenna with notch characteristics is designed with a microstrip line and a first branch to achieve a notch frequency band and broadband characteristics; the second branch and the third branch are designed to achieve notches in three different frequency bands, and expand the bandwidth of the antenna notch frequency band, so that the notches in the three different frequency bands all have wide frequency bands (i.e., wide notches are achieved); the first groove and the second groove are designed on the floor to achieve ultra-wideband; the third groove is designed on the floor to achieve miniaturization. Finally, the present application realizes an ultra-wideband slot antenna with multiple wide notch characteristics. The antenna has a wide working frequency band and ultra-wideband characteristics, can receive signals in more frequency bands, increase antenna utilization, and expand application scenarios; the antenna has a wide notch frequency band and has three notch characteristics, which can more effectively suppress interference signals in more frequency bands, has wide notch characteristics, can improve notch frequency band characteristics, and better suppress interference signals; the antenna is small in size, has miniaturization characteristics, has a simple structure, is easy to manufacture, and has low processing costs. The antenna of the present application is an ultra-wideband antenna with wide notch characteristics. It has the ability to suppress interference signals with a wideband, which is beneficial to the stability of transmission and the operation of the communication system, and realizes high-efficiency and accurate transmission. It can be applied to wireless communication systems, base stations, the Internet of Things, the Internet of Vehicles and other fields.

[0062] In a specific embodiment, the material used for the dielectric substrate is Rogers5880, which has a dielectric constant of 2.2, a loss tangent of 0.0009, and a thickness of 0.508 mm; the patch layer and the floor layer are both made of metal materials, and the specific materials are existing technologies; the antenna is fed by a microstrip line, and the input impedance is 50 ohms, which is conducive to connection with the SMA interface for subsequent testing.

[0063] The size of the antenna is Figure 3 and Figure 4 shown.

[0064] The electromagnetic full-wave simulation software CST is used to simulate and optimize the antenna. 11 The parameters, VSWR parameters, antenna gain and radiation pattern are studied.

[0065] like Figure 5 As shown, the antenna operates in a frequency band of 3.8-10.3 GHz, achieving ultra-wideband characteristics.

[0066] like Figure 6 As shown, the antenna's S 11 The parameters are all above -10dB in the three notch bands, and the notch bands cover a wide range, which can suppress more interference signals. Specifically, the first notch band is 5.3-6.5GHz, the second notch band is 7.3-8.7GHz, and the third notch band is 9.4-10.9GHz. It can be seen that each notch band is wide and can suppress more interference signals. In addition to the three notch bands, the antenna is S in the 5.1-11.4GHz band. 11 The values ​​are all less than -10dB, which proves that the antenna has achieved the characteristics of ultra-wideband, which is conducive to the stable operation of the communication system.

[0067] like Figure 7 As shown, the VSWR of the antenna is high in the three notch frequency bands, and the VSWR in other working frequency bands is less than 2, which proves that the antenna can achieve three wide notches while maintaining the ultra-wideband characteristics.

[0068] like Figure 8 As shown in the figure, the antenna gain is less than 0 in the three notch frequency bands, that is, the antenna cannot receive signals in this frequency band, thereby rejecting the reception of interference signals, and the wide notch frequency band can better reject the reception of interference signals. Except for the three notch frequency bands, the antenna gain is greater than 0, proving that the antenna can work normally in the ultra-wideband frequency band except the two notch frequency bands.

[0069] like Figures 9 to 11 As shown, the radiation pattern of the antenna on the E plane is in the shape of an "8", proving that the antenna is omnidirectional and can receive signals from all directions.

[0070] In summary, the antenna works at 5.1-11.4GHz, achieving ultra-wideband characteristics; it has three wide notches in the working frequency band, the first notch frequency band is 5.3-6.5GHz, the second notch frequency band is 7.3-8.7GHz, and the third notch frequency band is 9.4-10.9GHz, which can more strongly suppress the reception of interference signals in the notch frequency band; the overall size of the antenna is 15*10*0.544mm 3 , small size, realizing the miniaturization of the antenna, and the antenna has a low profile, easy to carry and convenient to transport.

[0071] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0072] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A broadband antenna with notch characteristics, characterized in that: include: A dielectric substrate, a patch layer arranged on the upper surface of the dielectric substrate, and a floor layer arranged on the lower surface of the dielectric substrate; The patch layer includes: a microstrip line and a first branch; The microstrip line is a rectangular structure, one short side of the rectangular structure is connected to one short side of the dielectric substrate, and the distances between the two long sides of the rectangular structure and the two long sides of the dielectric substrate are different; a "T"-shaped groove is provided on the microstrip line; The first branch is an "L"-shaped structure, and the "L"-shaped structure is arranged between the microstrip line and a long side of the dielectric substrate.

2. A broadband antenna with notch characteristics according to claim 1, characterized in that: The "T"-shaped groove is an asymmetric structure.

3. A broadband antenna with notch characteristics according to claim 2, characterized in that: The ratio of the long side to the short side of the "L"-shaped structure is greater than 7.

4. A broadband antenna with notch characteristics according to claim 3, characterized in that: The patch layer further includes: a second branch node spaced apart from the microstrip line; The second branch includes: a first part, a second part, a third part and a fourth part; The first part is an "E"-shaped structure, and the "E"-shaped structure includes: a first side, a second side, a third side and a fourth side; one end, a middle part and the other end of the first side are respectively connected to the second side, the third side and one end of the fourth side; the second side is arranged between the third side and the microstrip line; The second part is a strip-shaped structure, one end of which is connected to the other end of the first side and is colinear with the fourth side, and the other end of which is connected to the third part; The third part is a "convex"-shaped structure lacking a bottom edge; The fourth part is composed of three circular structures of equal size, the first circular structure is connected to the other end of the fourth side, and the second circular structure and the third circular structure are respectively connected to the two ends of the third part.

5. The broadband antenna with notch characteristics according to claim 4, characterized in that: The patch layer further includes: a third branch node which is spaced apart from the microstrip line and the second branch node; The third branch includes: a first component, a second component, a third component and a fourth component; The first component is a "U"-shaped structure, and the "U"-shaped structure includes: a first line, a second line and a third line; the first line is arranged parallel to the microstrip line and spaced apart, and two ends of the first line are respectively connected to one end of the second line and one end of the third line; The second component is a rectangular structure, one end of which is connected to the other end of the second line; The third component is three strip structures of unequal lengths, and one corresponding end is connected to the other long side of the second component; The fourth component is three equal-sized circular structures connected to the other corresponding end of the third component.

6. The broadband antenna with notch characteristics according to claim 5, characterized in that: The second component is provided with an I-shaped groove.

7. A broadband antenna with notch characteristics according to claim 6, characterized in that: The third component and the fourth component correspond one to one, and one third component and the corresponding fourth component form a parasitic structure. Each parasitic structure is provided with a strip groove.

8. A broadband antenna with notch characteristics according to any one of claims 1 to 7, characterized in that: The floor layer is provided with: a first groove; The first groove includes: a first section, a second section, a third section and a fourth section, all of which are strip-shaped structures; One end of the first section is connected to the middle of a long side of the dielectric substrate, and the other end extends toward the center of the lower surface of the dielectric substrate; One end of the second segment is vertically connected to the other end of the first segment; The third section and the fourth section are arranged in parallel and at intervals, one corresponding end is connected to the middle of the first section, and the other corresponding end extends in the opposite direction of the second section.

9. The broadband antenna with notch characteristics according to claim 8, characterized in that: The floor layer is also provided with: a second groove spaced apart from the first groove; The second groove includes: a first piece, a second piece, a third piece, a fourth piece and a fifth piece; The first sheet is a circular structure and is spaced apart from the first groove; The second sheet is a strip-shaped structure, one end of which is connected to the first sheet, and the other end of which is connected to the middle of the third sheet; The third sheet is a strip-shaped structure, one end of which is connected to the fourth sheet; The fourth piece is two "L"-shaped structures, the two "L"-shaped structures are sequentially connected to form a step-like structure, one end of the step-like structure is connected to one end of the third piece, and the other end is spaced apart from the fourth section; The fifth sheet is a strip-shaped structure, one end of which is connected to the intersection of the second sheet and the third sheet, and the other end of which extends toward the other end of the third sheet.

10. The broadband antenna with notch characteristics according to claim 9, characterized in that: The floor layer is also provided with: a third groove spaced apart from the first groove and the second groove; The third groove includes: a first belt, a second belt and a third belt, all of which are strip-shaped structures; One end of the first belt is connected to a long side of the dielectric substrate, and the other end extends along the short side of the dielectric substrate and is spaced apart from the third section and the fourth section; One end of the second belt is connected to the middle of the other long side of the dielectric substrate, and the other end extends along the short side of the dielectric substrate and is spaced apart from the fourth sheet; One end of the third belt is connected to the other long side of the dielectric substrate, and the other end extends along the short side direction of the dielectric substrate and is spaced apart from the third sheet and the fifth sheet.

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