A broadband antenna with notched-band characteristics

Abstract

This application belongs to the field of antenna technology and relates to a broadband antenna with a notched-band characteristic, comprising: a dielectric substrate, a patch layer disposed on the upper surface of the dielectric substrate, and a floor layer disposed on the lower surface of the dielectric substrate; the patch layer comprises: a microstrip line and a first branch; the microstrip line is a rectangular structure, one short side of the rectangular structure is connected to a short side of the dielectric substrate, and the two long sides of the rectangular structure are at different distances from the two long sides of the dielectric substrate; the microstrip line is provided with a "T"-shaped slot; the first branch is an "L"-shaped structure, and the "L"-shaped structure is disposed between the microstrip line and a long side of the dielectric substrate. The application can expand the bandwidth of a planar slot antenna while providing a wide notched-band characteristic.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a broadband antenna with notched-band 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] Slot antennas, also known as slot antennas, are antennas formed by slots cut into a conductive surface. They are typically long strips, approximately half a wavelength in length. Slot antennas radiate electromagnetic waves through the slots. They feature a low profile, a well-designed flush-mount structure, and conformability to the object they are mounted on. They are widely used in radar, navigation, electronic countermeasures, communications, and other fields, and are crucial components in modern wireless communication systems.

[0004] In existing technology, a planar slot antenna is a slot antenna formed into a specific shape (such as a strip, rectangle, or circle) on a flat conductive plate or dielectric substrate using precision machining techniques. This antenna utilizes the slots in the conductive plate or dielectric substrate as radiating elements, effectively transmitting electromagnetic wave energy into space through the principles of electromagnetic wave leakage and radiation. Planar slot antennas offer advantages such as low profile, ease of integration, light weight, and compact structure. They maintain high gain and directivity while achieving good conformality with the surrounding environment. Therefore, they have found widespread application in a variety of fields, including wireless communications, radar detection, satellite communications, microwave measurement, and electronic countermeasures. Furthermore, planar slot antennas offer excellent frequency stability and anti-interference capabilities, making them an indispensable key component in modern wireless communication systems and high-performance electronic devices.

[0005] However, current planar slot antennas mainly face the following problems:

[0006] 1) Traditional planar slot antennas are narrowband antennas with a narrow bandwidth, which can only receive limited signals, thus affecting the normal operation of the communication system. However, given the increasing number of wireless communication applications and the increasingly complex communication environment, antennas need to have a wider bandwidth to effectively capture signals.

[0007] 2) The antenna only has a notch frequency point, or the notch frequency band is narrow, which cannot suppress more interference signals, resulting in unstable communication system. Summary of the Invention

[0008] 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.

[0009] A broadband antenna with a notched band characteristic 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;

[0010] The patch layer includes: a microstrip line and a first branch;

[0011] 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 slot is provided on the microstrip line;

[0012] 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.

[0013] In one embodiment, the “T”-shaped slot is an asymmetrical structure.

[0014] In one embodiment, the ratio of the long side to the short side of the "L"-shaped structure is greater than 7.

[0015] In one embodiment, the patch layer further includes: a second branch disposed spaced apart from the microstrip line;

[0016] The second branch includes: a first part, a second part, a third part and a fourth part;

[0017] The first portion is an "E"-shaped structure, comprising: a first side, a second side, a third side, and a fourth side; one end, a middle portion, 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 provided between the third side and the microstrip line;

[0018] The second portion is a strip-shaped structure, one end of which is connected to the other end of the first side and collinear with the fourth side, and the other end of which is connected to the third portion;

[0019] The third part is a "convex"-shaped structure lacking a bottom edge;

[0020] 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.

[0021] In one embodiment, the patch layer further includes: a third branch node spaced apart from the microstrip line and the second branch node;

[0022] The third branch includes: a first component, a second component, a third component and a fourth component;

[0023] 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 its two ends are respectively connected to one end of the second line and one end of the third line;

[0024] The second component is a rectangular structure, one end of which is connected to the other end of the second line;

[0025] The third component is a strip structure of three unequal lengths, with one corresponding end connected to the other long side of the second component;

[0026] The fourth component is three equal-sized circular structures connected to the other corresponding end of the third component.

[0027] In one embodiment, an I-shaped groove is provided on the second component.

[0028] In one embodiment, the third component and the fourth component correspond one to one, and one third component and the corresponding fourth component form a parasitic structure, and each parasitic structure is provided with a strip groove.

[0029] In one embodiment, the floor layer is provided with: a first groove;

[0030] The first groove includes a first section, a second section, a third section, and a fourth section, all of which are strip-shaped structures;

[0031] 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;

[0032] One end of the second segment is vertically connected to the other end of the first segment;

[0033] The third section and the fourth section are arranged in parallel and spaced apart, 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.

[0034] In one embodiment, the floor layer is further provided with: a second groove spaced apart from the first groove;

[0035] The second groove includes: a first piece, a second piece, a third piece, a fourth piece and a fifth piece;

[0036] The first piece is a circular structure and is spaced apart from the first groove;

[0037] The second piece is a strip-shaped structure, one end of which is connected to the first piece, and the other end is connected to the middle of the third piece;

[0038] The third piece is a strip-shaped structure, one end of which is connected to the fourth piece;

[0039] The fourth piece is composed of 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;

[0040] The fifth piece is a strip structure, one end of which is connected to the intersection of the second piece and the third piece, and the other end of which extends toward the other end of the third piece.

[0041] In one embodiment, the floor layer is further provided with: a third groove spaced apart from the first groove and the second groove;

[0042] The third groove includes: a first belt, a second belt and a third belt, all of which are strip-shaped structures;

[0043] One end of the first strip 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.

[0044] One end of the second strip 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.

[0045] 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 of the dielectric substrate and is spaced apart from the third sheet and the fifth sheet.

[0046] 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 and third branches 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 and second grooves are designed on the floor to achieve ultra-wideband; and the third groove is designed on the floor to achieve miniaturization. Ultimately, this application realizes an ultra-wideband slot antenna with multiple wide notch characteristics. The antenna has a wide operating frequency band and ultra-wideband characteristics, can receive signals from more frequency bands, increase antenna utilization, and expand application scenarios. The antenna has a wide notch frequency band and three notch characteristics, 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 and has miniaturization characteristics, a simple structure, easy to manufacture, and low processing cost. The antenna of the present application is an ultra-wideband antenna with wide notch characteristics. It has the ability to suppress interference signals with 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

[0047] Figure 1 is a three-dimensional schematic diagram of a broadband antenna with notched band characteristics in one embodiment;

[0048] Figure 2 is another perspective schematic diagram of a broadband antenna with notched band characteristics according to an embodiment;

[0049] Figure 3 FIG1 is a top view of a broadband antenna with notched band characteristics according to an embodiment;

[0050] Figure 4 is a bottom view of a broadband antenna with notched band characteristics according to one embodiment;

[0051] 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;

[0052] Figure 6 The S when a broadband antenna with a notch characteristic is provided with a first groove, a second groove and a third groove on a floor layer in an embodiment. 11 Schematic diagram of the curve;

[0053] Figure 7 FIG1 is a schematic diagram of a VSWR curve of a broadband antenna with notch characteristics in one embodiment;

[0054] Figure 8 FIG1 is a schematic diagram of a gain curve of a broadband antenna with a notch characteristic in one embodiment;

[0055] Figure 9 1 is an E-plane radiation pattern of a broadband antenna with notched characteristics at 5.3 GHz in one embodiment;

[0056] Figure 10 1 is an E-plane radiation pattern of a broadband antenna with notched band characteristics at 7.1 GHz in one embodiment;

[0057] Figure 11 FIG. 1 is an E-plane radiation pattern of a broadband antenna with notched band characteristics at 9.2 GHz in one embodiment.

[0058] Reference numerals:

[0059] Dielectric substrate 1;

[0060] Patch layer 2, first branch 21, second branch 22, third branch 23, microstrip line 24;

[0061] The floor layer 3 has a first groove 31 , a second groove 32 and a third groove 33 . DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application without creative work are within the scope of protection of this application.

[0063] 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 various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0064] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "multiple groups" means at least two groups, such as two groups, three groups, and so on, unless otherwise specifically defined.

[0065] In this application, unless otherwise specified or limited, the terms "connect," "fix," etc. should be understood in a broad sense. For example, "fix" can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two elements or an interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0066] 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 this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0067] The present application provides a broadband antenna with notched band 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.

[0068] The dielectric substrate is a load-bearing unit that provides loading space for the patch layer and the floor layer.

[0069] The patch layer is a radiating element, located 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 notched frequency band. The microstrip line is a rectangular structure, with one short side connected to a short side of the dielectric substrate, the other short side of the rectangular structure spaced apart from the other short side of the dielectric substrate, and the two long sides of the rectangular structure spaced apart from the two long sides of the dielectric substrate, respectively. The distances between the two long sides of the rectangular structure and the two long sides of the dielectric substrate are different, meaning that the microstrip line is offset. The microstrip line is provided with a T-shaped slot. The first branch is an L-shaped structure, located between the microstrip line and one long side of the dielectric substrate.

[0070] The floor layer is a grounding unit and is provided on the lower surface of the dielectric substrate.

[0071] 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% compared with the previous bandwidth, and achieving ultra-wideband.

[0072] 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.

[0073] 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 arranged 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.

[0074] 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 that of the fourth side.

[0075] The second part is a strip structure, one end of which is connected to the other end of the first side and is collinear with the fourth side, and the other end is connected to the third part.

[0076] 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 of different heights to form an asymmetrical structure.

[0077] 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.

[0078] The first side, the second side, the third side, the fourth side, the second portion and the third portion have the same width.

[0079] In the above setting, coupling is generated between the first part and the microstrip line, so that the current at the notch frequency point is concentrated on the first part, and the electromagnetic wave cannot be radiated 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.

[0080] 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.

[0081] The first component is a "U"-shaped structure. The "U"-shaped structure includes: a first line, a second line, and a third line. The first line, the second line, and the third line are of equal width. The first line is arranged parallel to the microstrip line and spaced apart. The two ends of the first line are respectively perpendicularly connected to one end of the second line and the third line. The third line is arranged parallel to a short side of the dielectric substrate and spaced apart.

[0082] 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 arranged at a distance from a long side of the dielectric substrate; one long side of the second component is arranged at a distance and parallel to the third line; the length of the second component is less than the length of the third line.

[0083] The third component is three strip structures of unequal length but equal width, 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 second branch.

[0084] The fourth component is three circular structures of equal size and is connected to the other corresponding end of the third component.

[0085] 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, forming a new notch frequency point near the notch point generated by the first component, and the two are combined to achieve the expansion of the notch frequency band; the third component and the fourth component enable a smooth transition of the current when flowing through the circular edge, thereby achieving the expansion of the notch frequency band.

[0086] Further preferably, an I-shaped slot is provided on the second component to further expand the notch frequency band.

[0087] Further preferably, the third component and the fourth component correspond one to one, and a third component and the corresponding fourth component form a parasitic structure. Each parasitic structure is 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. 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), so as 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.

[0088] 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.

[0089] 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.

[0090] One end of the second segment is vertically connected to the other end of the first segment.

[0091] The third section and the fourth section are arranged in parallel and spaced apart, 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.

[0092] In the above configuration, the first section can realize a narrowband resonant frequency of the antenna; the second, third, and fourth sections can change the current path, thereby increasing the resonant frequency and further expanding the bandwidth of the frequency band.

[0093] Preferably, the floor layer is further provided with a second groove, which 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.

[0094] The first piece is a circular structure and is spaced apart from the first groove.

[0095] The second piece is a strip structure, one end of which is connected to the first piece, and the other end of which is vertically connected to the middle of the third piece. The second piece is arranged parallel to the short side of the dielectric substrate.

[0096] 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.

[0097] 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 and fourth sections.

[0098] 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 shorter than that of the third piece, and one long side of the fifth piece is collinear with one long side of the third piece.

[0099] It should be noted that the first piece is located below the corresponding microstrip line.

[0100] In the above configuration, 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, third, fourth and fifth pieces can introduce multiple new resonant modes, which interact with the original resonant modes to further expand the antenna frequency band, increasing the ultra-wideband bandwidth by 330% compared to the narrowband bandwidth of the existing technology.

[0101] 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 includes: 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 all spaced apart and parallel to the short side of the dielectric substrate.

[0102] One end of the first strip 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.

[0103] One end of the second strip 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 piece.

[0104] One end of the third strip is connected to 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 third sheet and the fifth sheet.

[0105] The above setting increases the path for current to flow through the edge, thereby miniaturizing the antenna, and the size of the antenna is reduced by 20% compared to before.

[0106] 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 and third branches 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 and second grooves are designed on the floor to achieve ultra-wideband; and the third groove is designed on the floor to achieve miniaturization. Ultimately, this application realizes an ultra-wideband slot antenna with multiple wide notch characteristics. The antenna has a wide operating 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, 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 and has miniaturization characteristics, 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 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.

[0107] 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, the specific materials of which 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.

[0108] The size of the antenna is Figure 3 and Figure 4 shown.

[0109] The electromagnetic full-wave simulation software CST was used to simulate and optimize the antenna. 11 The parameters, VSWR parameters, antenna gain and radiation pattern are studied.

[0110] like Figure 5 As shown, the antenna operates in a frequency band of 3.8-10.3 GHz, achieving ultra-wideband characteristics.

[0111] like Figure 6 As shown, the antenna's S 11The 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-band in the 5.1-11.4GHz band. 11 The values ​​are all less than -10dB, proving that the antenna achieves ultra-wideband characteristics, which is beneficial to the stable operation of the communication system.

[0112] like Figure 7 As shown in the figure, 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.

[0113] like Figure 8 As shown, the antenna's gain is less than 0 in all three notched frequency bands, meaning the antenna cannot receive signals within these bands, thus rejecting interference signals. Furthermore, the wide notched frequency bands provide better rejection of interference signals. Outside of the three notched frequency bands, the antenna's gain is greater than 0, demonstrating that the antenna operates normally within the ultra-wideband frequency range, excluding the two notched frequency bands.

[0114] like Figures 9 to 11 As shown in the figure, the radiation pattern of the antenna on the E plane is in the shape of an "8", which proves that the antenna is omnidirectional and can receive signals from all directions.

[0115] In summary, the antenna operates at 5.1-11.4GHz, achieving ultra-wideband characteristics; it has three wide notches within the operating frequency band, 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, which can better suppress the reception of interference signals within the notch bands; 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, which is easy to carry and convenient to transport.

[0116] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0117] The technical features of the above embodiments can 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.

[0118] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A broadband antenna with notch characteristics, characterized in that: include: A dielectric substrate, a patch layer provided on the upper surface of the dielectric substrate, and a floor layer provided 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 a 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 slot is provided on the microstrip line; The first branch is an "L"-shaped structure, and the "L"-shaped structure is provided between the microstrip line and a long side of the dielectric substrate; The "T"-shaped groove is an asymmetric structure; The ratio of the long side to the short side of the "L"-shaped structure is greater than 7; The patch layer further includes: a second branch disposed 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 portion is an "E"-shaped structure, comprising: a first side, a second side, a third side, and a fourth side; one end, a middle portion, and the other end of the first side are connected to the second side, the third side, and one end of the fourth side, respectively; the second side is provided between the third side and the microstrip line; The second portion is a strip-shaped structure, one end of which is connected to the other end of the first side and collinear with the fourth side, and the other end of which is connected to the third portion; 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.

2. The broadband antenna with notched band characteristics according to claim 1, characterized in that: 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 its two ends 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 a strip structure of three unequal lengths, with one corresponding end 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.

3. The broadband antenna with notched band characteristics according to claim 2, characterized in that: The second component is provided with an "I"-shaped groove.

4. The broadband antenna with notched band characteristics according to claim 3, characterized in that: The third component and the fourth component correspond to each other one by one. One third component and the corresponding fourth component form a parasitic structure. Each parasitic structure is provided with a strip-shaped groove.

5. The broadband antenna with notch characteristics according to any one of claims 1 to 4, 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 spaced apart, 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.

6. The broadband antenna with notch characteristics according to claim 5, characterized in that: 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 piece is a circular structure and is spaced apart from the first groove; The second piece is a strip-shaped structure, one end of which is connected to the first piece, and the other end is connected to the middle of the third piece; The third piece is a strip-shaped structure, one end of which is connected to the fourth piece; The fourth piece is composed of 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 piece is a strip structure, one end of which is connected to the intersection of the second piece and the third piece, and the other end of which extends toward the other end of the third piece.

7. The broadband antenna with notch characteristics according to claim 6, characterized in that: 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 strip 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 strip 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 of the dielectric substrate and is spaced apart from the third sheet and the fifth sheet.

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