CN116565533A - A Miniaturized Ultra-Wideband Antenna - Google Patents

Abstract

The application belongs to the technical field of antennas, and relates to a miniaturized ultra-wideband antenna, which comprises: an antenna unit; the antenna unit includes: a dielectric substrate and two radiating patches; the two radiation patches are arranged on the front surface of the dielectric substrate; the radiation patch is provided with a plurality of slots; the radiation patches and the slots are distributed in an axisymmetric manner about the same central line of the dielectric substrate; the slots are distributed according to current paths with minimum surface current or less than 0.1A/m surface current at the antenna frequency points; the current path is fitted by a cubic polynomial; the antenna unit is a Vivaldi antenna. By adopting the ultra-wideband antenna, the miniaturization can be realized.

Description

A Miniaturized Ultra-Wideband Antenna

technical field

The present application relates to the technical field of antennas, in particular to a miniaturized ultra-wideband antenna.

Background technique

Radar reconnaissance systems usually use antennas to receive various radar signals. With the rapid development of the electronic information field, antennas, as one of the most important components in wireless communication, naturally need to constantly innovate to adapt to more complex and changeable communication systems and environments. In recent years, wireless communication applications have put forward higher requirements for the comprehensive performance of antennas. Antennas are usually required to have multiple advantages, so antennas with excellent comprehensive performance are receiving more and more attention.

Among them, due to the increasingly complex electromagnetic environment, higher requirements are put forward for the sensitivity of radar reconnaissance equipment to receive signals. The research on radar polarization is getting more and more in-depth, and the requirements for antenna miniaturization and ultra-wideband are also increasing. It is urgent, and relevant research has attracted attention.

In the prior art, there are few antennas that can achieve miniaturization and ultra-wideband at the same time, or can achieve miniaturization and ultra-wideband at the same time, but at the expense of antenna gain, the application range of the antenna is narrowed, or the antenna structure is complicated , is not easy to design and process, and the cost is high.

Contents of the invention

Based on this, it is necessary to address the above technical problems and provide a miniaturized ultra-wideband antenna, which can realize a miniaturized ultra-wideband antenna without sacrificing antenna gain.

A miniaturized ultra-wideband antenna, comprising: an antenna unit;

The antenna unit includes: a dielectric substrate and two radiation patches; the two radiation patches are both arranged on the front side of the dielectric substrate;

The radiation patch is provided with a plurality of slots; the radiation patch and the slots are distributed axially symmetrically with respect to the same center line of the dielectric substrate;

The slots are distributed according to the current path where the surface current at the frequency point of the antenna is the smallest or the surface current is less than 0.1A/m.

In one embodiment, the current path is fitted by a cubic polynomial.

In one embodiment, the antenna unit is a Vivaldi antenna.

In one embodiment, the antenna unit further includes: a metasurface lens disposed on the front surface of the dielectric substrate;

The metasurface lens is spaced apart from the two radiation patches, and the metasurface lens is distributed axially symmetrically with respect to a central line of the dielectric substrate.

In one embodiment, the refractive index of the metasurface lens is greater than that of air.

In one embodiment, the metasurface lens includes: a plurality of metasurface mirrors distributed in an array;

The number of the plurality of metasurface mirrors increases along the direction from the edge of the dielectric substrate to the centerline of the dielectric substrate in a Fibonacci sequence.

In one embodiment, the metasurface mirror comprises: a first part and four second parts;

The first part is a square ring structure;

The second part is a bar-shaped structure; one corresponding end of the four second parts is vertically connected to the midpoint of one side of the square ring structure, and the other corresponding end extends away from the first part.

In one embodiment, the number of the antenna units is two;

The two antenna units are cross-connected.

In one embodiment, taking the centerline along the length direction of the dielectric substrate as the axis of symmetry, the antenna unit is further provided with: slots distributed along the axis of symmetry;

The directions of the slots on the two antenna units are opposite, and the bottoms of the slots on the two antenna units are relatively abutted against each other.

In one embodiment, the antenna unit further includes: a feeding structure provided on the back of the dielectric substrate;

The feed structure includes: sequentially connected fan-shaped branches, connection lines and microstrip feed lines to form a balun structure.

The above-mentioned miniaturized ultra-wideband antenna is equipped with curved slots that fit the current path on the radiation patch of the antenna to improve the impedance matching near the corresponding frequency point, and then reduce the S11 at the low frequency in a targeted manner to expand the bandwidth without sacrifice antenna gain.

Description of drawings

Fig. 1 is a front perspective view of an antenna unit in a miniaturized ultra-wideband antenna in one embodiment;

Fig. 2 is a reverse perspective view of the antenna unit in a miniaturized ultra-wideband antenna in one embodiment;

Fig. 3 is a top view of the antenna unit in a miniaturized ultra-wideband antenna in one embodiment;

Fig. 4 is a bottom view of the antenna unit in a miniaturized ultra-wideband antenna in one embodiment;

Fig. 5 is a first schematic diagram of two antenna elements in a miniaturized ultra-wideband antenna in an embodiment;

Fig. 6 is a second schematic diagram of two antenna elements in a miniaturized ultra-wideband antenna in an embodiment;

Fig. 7 is a third schematic diagram of two antenna elements in a miniaturized ultra-wideband antenna in an embodiment;

Figure 8 is a surface current distribution diagram of a miniaturized ultra-wideband antenna in an embodiment, wherein (a) is the surface current distribution at 4GHz, and (b) is the surface current distribution at 5.5GHz;

Fig. 9 is a cubic fitting curve function extraction figure in a kind of miniaturized ultra-wideband antenna in one embodiment, wherein, (a) is the surface current curve figure, (b) is the scatter diagram extracted according to the surface current curve, (c ) is the cubic curve figure fitted according to the scatter plot extracted;

Fig. 10 is a S11 comparison diagram of a fitting curve slot and a rectangular slot in a miniaturized ultra-wideband antenna in one embodiment;

Fig. 11 is a structural diagram of a metasurface sub-mirror in a miniaturized ultra-wideband antenna in an embodiment, wherein (a) is a top view, and (b) is a side view;

Fig. 12 is a comparison diagram of the refractive index of a four-cornered nail type and a cross-shaped metasurface sub-mirror in a miniaturized ultra-wideband antenna in one embodiment;

Fig. 13 is a performance parameter diagram of a metasurface mirror in a miniaturized ultra-wideband antenna in an embodiment;

Fig. 14 is a gain comparison diagram under different arrangements of metasurface mirrors in a miniaturized ultra-wideband antenna in one embodiment;

Fig. 15 is the incident and transmitted waves of a kind of miniaturized ultra-broadband antenna at the interface of metasurface mirror and air in one embodiment;

FIG. 16 is a graph of S11 and S22 of a miniaturized ultra-wideband antenna in an embodiment;

Fig. 17 is an S12 curve diagram of a miniaturized ultra-wideband antenna in an embodiment;

FIG. 18 is a gain curve diagram of a miniaturized ultra-wideband antenna in an embodiment;

Figure 19 is a radiation pattern diagram of two antenna elements at 5 GHz in a miniaturized ultra-wideband antenna in one embodiment, wherein (a) is one antenna element, and (b) is another antenna element;

Fig. 20 is a radiation pattern diagram of two antenna elements in a miniaturized ultra-wideband antenna at 9 GHz in one embodiment, where (a) is one antenna element, and (b) is another antenna element;

Fig. 21 is a radiation pattern at 13 GHz of two antenna units in a miniaturized ultra-wideband antenna in an embodiment, where (a) is one antenna unit, and (b) is another antenna unit.

Explanation of reference signs:

Dielectric substrate 1, radiation patch 2, slot 3, metasurface lens 4;

Fan-shaped branches 51, connection lines 52, and microstrip feed lines 53.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relationship between the components in a certain posture (as shown in the figure). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, descriptions such as "first", "second" and so on in this application are used for description purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "multiple groups" means at least two groups, such as two groups, three groups, etc., unless specifically defined otherwise.

In this application, unless otherwise clearly specified and limited, the terms "connection" and "fixation" should be understood broadly, for example, "fixation" can be a fixed connection, a detachable connection, or an integral body; 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 intermediary, it can be an internal connection between two components or an interaction relationship between two components, unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In addition, the technical solutions of the various embodiments of the present application can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered as a combination of technical solutions. Does not exist, nor is it within the scope of protection required by this application.

The present application provides a miniaturized ultra-wideband antenna, as shown in FIG. 1 to FIG. 7 , and in one embodiment, it includes: an antenna unit.

The antenna unit includes: a dielectric substrate 1 and two radiation patches 2; the two radiation patches are both arranged on the front side of the dielectric substrate.

The material used for the dielectric substrate 1 is Rogers 5880, the dielectric constant is 2.2, the loss tangent is 0.0009, and the thickness of the dielectric substrate is 0.508 mm.

The radiation patch 2 is provided with a plurality of slots 3; the radiation patch and the slots are distributed axially symmetrically with respect to the same central line of the dielectric substrate.

The number, position and shape of the slots 3 are distributed according to the current path with the minimum surface current or a surface current less than 0.1A/m. This slot structure based on the surface current path can be more effectively attached to the radiation patch, making the path of the current flowing along the slot longer, extending the effective path of the current, and confining the energy near the slot. The impedance matching near the corresponding frequency point is well improved, and then the S11 at the low frequency is reduced in a targeted manner, the bandwidth is expanded, and miniaturization is realized.

Specifically, analyze the path of the surface current at the corresponding frequency point of the antenna (at the point where the frequency is to be reduced), and select the current path curve with the smallest surface current or a surface current less than 0.1A/m. Usually, the curve is axisymmetric with respect to the antenna distributed. The number, position and shape of the slots are the same as the number, position and shape of the minimum path of the surface current at the corresponding frequency point of the antenna, or the number, position and shape of the slots are respectively the same as the surface current at the corresponding frequency point of the antenna is less than 0.1A/ The m paths are the same in number, location and shape. It should be noted that when more than one current path at different frequency points overlaps, the number of current paths is not counted repeatedly, and only one slot is required for the corresponding position.

Preferably, the current path is by curve fitting.

Further preferably, the current path is fitted by a cubic polynomial curve, and the cubic polynomial curve is obtained by a cubic polynomial fitting function, so as to maximize the impedance matching near the corresponding frequency point, and the slot structure of this cubic polynomial curve fitting fits better The current path can better expand the bandwidth.

Further preferably, the antenna unit is a Vivaldi antenna, and two radiation patches are used as two radiation arms of the Vivaldi antenna, so as to further expand the bandwidth, improve the gain and directional radiation capability. The traditional Vivaldi antenna requires a large size in order to obtain good performance, which limits the application range of the Vivaldi antenna. However, this application designs a slot on the Vivaldi antenna that fits the current path, so it is equivalent to a further realization on the basis of ultra-wideband miniaturization.

The above-mentioned miniaturized ultra-wideband antenna is equipped with curved slots that fit the current path on the radiation patch of the antenna, so as to improve the impedance matching near the corresponding frequency point to the greatest extent, and then reduce the S11 at low frequencies in a targeted manner without sacrificing Expand the bandwidth under the premise of gain.

In one embodiment, the antenna unit further includes: a metasurface lens 4 arranged on the front side of the dielectric substrate; the metasurface lens is spaced from two radiation patches, and the metasurface lens is distributed axially symmetrically with respect to a center line of the dielectric substrate .

Preferably, the refractive index of the metasurface lens is greater than that of air.

Further preferably, the metasurface lens includes: a plurality of metasurface submirrors distributed in an array at intervals; the number of the plurality of metasurface submirrors increases in a Fibonacci sequence along the direction from the edge of the medium substrate toward the centerline of the medium substrate, to A phase compensation lens structure is formed to enhance the directivity of the beam, thereby increasing the antenna gain, especially at high frequencies.

Still further preferably, the metasurface sub-mirror includes: a first part and four second parts; the first part is a square ring structure; the second part is a strip structure; a corresponding end of the four second parts is respectively connected to the square ring structure The midpoints of one side are vertically connected, and the other corresponding end extends away from the first part. The four-cornered spike-shaped metasurface lens can increase the gain of the antenna without increasing the size of the antenna, thereby achieving miniaturization while increasing the gain. It should be noted that the width of the first part is equal to that of the second part, and the inner ring side length of the first part is equal to the length of the second part, so as to achieve higher gain.

In one embodiment, the number of antenna units is two; the two antenna units are connected in a cross.

Preferably, taking the center line along the length direction of the dielectric substrate as the axis of symmetry, the antenna unit is further provided with: slots distributed along the axis of symmetry; the directions of the slots on the two antenna units are opposite, and the slots on the two antenna units are The groove bottoms of the slots are relatively abutted.

The above settings make the antenna a dual-polarization antenna, which can achieve dual polarization, receive all polarization information, and has strong anti-interference ability, so it can improve the sensitivity of the system and is more suitable for engineering applications such as radar systems.

In one embodiment, the antenna unit further includes: a circular cavity structure arranged on the front of the dielectric substrate and a feeding structure arranged on the back of the dielectric substrate; the feeding structure includes: sequentially connected fan-shaped branches 51, connecting wires 52 And the microstrip feeder 53 to form a balun structure, so as to improve the impedance matching of the antenna.

Preferably, the microstrip feeder adopts a trapezoidal structure to achieve better impedance matching.

It should be noted that the antenna is fed by a balun structure, and the impedance of the feed port is 50 ohms, which matches the SMA interface.

In a specific embodiment, by analyzing the surface current of the target frequency point to be reduced and fitting multiple times, a cubic polynomial fitting curve function is obtained: , where s is a proportionality coefficient, and s=2.76841 is obtained through prior art calculations. The number of slots on each radiation patch is 4, and the slot width is 4 mm. The position of the slots fits the current distribution, and the slot width is selected as 0.65 mm.

Using the electromagnetic full-wave simulation software CST to simulate and optimize the above-mentioned antenna, its structural parameters, S11 parameters, S21 parameters, antenna gain and radiation pattern are studied.

For a single-polarized antenna, its overall dimensions are , the space volume is only 0.3299λ ² (mm ² ), where λ is the wavelength at the lowest frequency within the bandwidth range, the bandwidth range is 2.07-13.86GHz, the bandwidth is 148%, and the gain is 12.32dBi.

As shown in Figure 8, the S11 parameters of the designed antenna at 4GHz and 5.5GHz are greater than -10dB. At this time, the designed antenna does not have good bandwidth characteristics, especially at low frequencies. Given the surface current distribution at 4GHz and 5.5GHz, as shown in Figure 8(a) and Figure 8(b), the ripple treatment is performed on the edge of the antenna, and the slot is designed according to the cubic polynomial curve fitting to change the path of the surface current , to better confine the energy to the vicinity of the slots, and the slots fitted by the cubic polynomial curve fit the current path to maximize the impedance matching characteristics near 4GHz and 5.5GHz, reduce the low-frequency impedance bandwidth, thereby expanding the bandwidth and realizing small size change.

As shown in Figure 9, three fitting curve function extractions are performed, specifically: the current paths that need to be extended at 4GHz and 5.5GHz are converted into curves as shown in Figure 9(a), and obtained through extraction as shown in Figure 9(b) As shown in the scatter diagram, the curves are equivalently converted into data points, and finally the five curves are fitted into a cubic polynomial fitting function curve as shown in Figure 9(c). Fitting curve slot Vivaldi antenna, compared with traditional rectangular slot loading, fitting curve slot can be more effectively attached to the radiation arm structure, making the path of current flowing along the slot longer and extending the effective path of current , improve the impedance matching near a specific frequency point, and then reduce the S11 at the low frequency in a targeted manner, and expand the bandwidth.

As shown in FIG. 10 , a comparison diagram of S11 between a cubic polynomial fitting curve slot based on a current path and a corresponding rectangular slot is given. The simulation results show that the bandwidth range of the rectangular slot is 2.27GHz-13GHz, and the bandwidth range of the fitting curve slot is 2.07GHz-13.86GHz. It can be seen that the fitting curve slot has a more obvious effect on expanding the bandwidth. The bandwidth range is reduced by 0.2 GHz at low frequencies and increased by 0.86 GHz at high frequencies, compared to an increase of 8% in the entire bandwidth.

As shown in Figure 11, a four-cornered nail-shaped phase-compensated metasurface submirror structure is designed, in which the width is 0.15mm, the side length of the square ring structure is 1.2mm, and the length of the nail-shaped (ie, bar-shaped structure) is 0.9mm, with a pitch of 0.1mm, the structure design is integrated on the antenna dielectric substrate as a phase compensation lens structure to maintain the advantages of miniaturization while improving the gain at high frequencies. The refractive indices of the four-cornered nail-shaped metasurface mirror and the cross-shaped metasurface mirror are shown in Fig. 12 .

As shown in Figure 13, the frequency domain simulation of the metasurface submirror in CST is performed to obtain performance parameters. In the bandwidth range of 2-14GHz, , which completely covers the working frequency band of the designed antenna, that is, the increased working bandwidth of the metasurface mirror will not affect the ultra-wideband characteristics of the antenna. The value of S12 is close to 0, indicating that the expected loss of the designed metasurface submirror is almost negligible. At the same time, the refractive index of the metasurface mirror is greater than 4.45, which makes the designed metasurface lens have a refractive index greater than that of air, which can enhance the directivity of the beam.

As shown in Figure 14, the comparison diagram of the arrangement of the metasurface mirrors of the antenna in Fibonacci sequence (solid line) and arithmetic sequence arrangement (dotted line). It can be seen from FIG. 14 that when arranged in an arithmetic sequence, the number of metasurface mirrors is 72; when arranged in a Fibonacci sequence, the number of metasurface mirrors is 66. The Fibonacci sequence arrangement reduces the number of metasurface sub-mirrors by 6, and at the same time, the gain at high frequencies is higher, which can increase by up to 0.2dBi. This arrangement is superior in comparison.

As shown in FIG. 15 , it is a schematic diagram of propagation of electromagnetic waves at the interface between the metasurface lens and air. The main purpose of placing the metasurface mirror between the radiating arms of the antenna is to design an effective refractive index n greater than effective surface. Has a refractive index /> and /> The relationship between the incident wave at the interface between two media and the transmitted wave at the two interfaces can be given by the formula /> express. when /> greater than /> , the angle of refraction in air /> greater than the angle of incidence in the lens /> , so that the electric field is concentrated in the center of the antenna aperture, thereby improving the directivity of the antenna.

As shown in FIG. 16 , the dual-polarization antenna (more specifically, the dual-polarization metasurface lens fitting curve slot Vivaldi antenna) is simulated to obtain a simulation diagram. It can be seen from Figure 16 that the bandwidth of the dual-polarized antenna is 2.17GHz-13.7GHz, and the S11 of the two dual-polarized antenna units is slightly different from that of the single-polarized antenna, which is similar to the effect of the dual-polarized slot on the surface current. A change in the current slightly reduces the antenna bandwidth. Its working bandwidth has reached 145.3%, which belongs to ultra-wideband antenna.

As shown in Fig. 17, the simulation of the dual-polarization metasurface lens fitting curve slot Vivaldi antenna is carried out, and the simulation S12 diagram is obtained. It can be seen that the isolation of the dual-polarized antenna is less than -25dB in the entire bandwidth range, and less than -30dB in more than 80% of the working range, which has good isolation characteristics.

Figure 18 shows the gain curve of the dual-polarized antenna. The two antenna units are simulation unit 1 and simulation unit 2 respectively. It can be seen that the gain of the antenna is between 2GHz and 14GHz, the lowest gain is about 5.25dBi, and the highest gain is It is 12.32dBi. Compared with the antenna without the metasurface lens, the gain of this application is significantly improved at high frequencies, up to 0.81dBi.

Figures 19 to 21 show the radiation pattern of one antenna unit and the radiation pattern of another antenna unit at different frequency points in the working frequency band of the present application. It can be seen from the pattern that one antenna unit and another antenna unit The radiation patterns of the antennas all show directional radiation characteristics, which proves that the radiation performance of the antenna is good. And the pattern of one antenna unit is slightly different from that of the other antenna unit, but the overall difference is not large. The difference is due to the difference in the slots opened when the cross-cross dual-polarized antenna is formed, resulting in a slight difference in the structure of the antenna unit. . However, the overall structure of the antenna is similar, so that the radiation pattern of the antenna has little difference in the main beam.

To sum up, the antenna of this application is designed with a fitting curve slot that fits the current path, and utilizes the corrugated edge structure that fits the surface current path to more effectively reduce the S11 at the corresponding frequency point and improve the S11 at the corresponding frequency point to the greatest extent. Impedance matching, extended bandwidth, the working frequency band is 2.17GHz-13.7GHz, the bandwidth reaches 145.3%, and the overall size is , the space volume is only /> , the antenna gain is 5.25dBi-12.32dBi in the working frequency band, the highest gain reaches 12.32dBi, the isolation is less than -30dB in the entire bandwidth range, and less than -35dB in the bandwidth range of more than 80%, which has good isolation characteristics. The antenna bandwidth is less than -15dB, and S21 is basically 0, so it will not affect the original antenna bandwidth. The refractive index of the metasurface lens is between 4.45-4.55, and has refraction characteristics. At the same time, by adding a phase compensation lens, the gain of the antenna, especially the gain at high frequencies, is increased without increasing the size and affecting the miniaturization of the antenna. In addition, the antenna in this application has high gain and isolation, making the antenna suitable for use in scenarios with high polarization sensitivity, and the spatial size of the antenna is only /> , small in size, easy to process, easy to carry, realizes the miniaturization of the antenna, and can be applied to application scenarios such as radar reconnaissance systems.

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

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims (10)

1. A miniaturized ultra-wideband antenna, characterized in that, comprising: an antenna unit; The antenna unit includes: a dielectric substrate and two radiation patches; the two radiation patches are both arranged on the front side of the dielectric substrate; The radiation patch is provided with a plurality of slots; the radiation patch and the slots are distributed axially symmetrically with respect to the same center line of the dielectric substrate; The slots are distributed according to the current path where the surface current at the frequency point of the antenna is the smallest or the surface current is less than 0.1A/m. 2. The miniaturized ultra-wideband antenna according to claim 1, wherein the current path is fitted by a cubic polynomial. 3. The miniaturized ultra-wideband antenna according to claim 2, wherein the antenna unit is a Vivaldi antenna. 4. The miniaturized ultra-wideband antenna according to any one of claims 1 to 3, wherein the antenna unit further comprises: a metasurface lens arranged on the front side of the dielectric substrate; The metasurface lens is spaced apart from the two radiation patches, and the metasurface lens is distributed axially symmetrically with respect to a central line of the dielectric substrate. 5. The miniaturized ultra-wideband antenna according to claim 4, wherein the refractive index of the metasurface lens is greater than that of air. 6. The miniaturized ultra-wideband antenna according to claim 5, wherein the metasurface lens comprises: a plurality of metasurface mirrors distributed in an array; The number of the plurality of metasurface mirrors increases along the direction from the edge of the dielectric substrate to the centerline of the dielectric substrate in a Fibonacci sequence. 7. The miniaturized ultra-wideband antenna according to claim 6, wherein the metasurface sub-mirror comprises: a first part and four second parts; The first part is a square ring structure; The second part is a bar-shaped structure; one corresponding end of the four second parts is vertically connected to the midpoint of one side of the square ring structure, and the other corresponding end extends away from the first part. 8. The miniaturized ultra-wideband antenna according to any one of claims 1 to 3, wherein the number of said antenna elements is two; The two antenna units are cross-connected. 9. The miniaturized ultra-wideband antenna according to claim 8, characterized in that, taking the center line along the length direction of the dielectric substrate as the axis of symmetry, the antenna unit is also provided with: distributed along the axis of symmetry slot; The directions of the slots on the two antenna units are opposite, and the bottoms of the slots on the two antenna units are relatively abutted against each other. 10. The miniaturized ultra-wideband antenna according to any one of claims 1 to 3, wherein the antenna unit further comprises: a feeding structure arranged on the back side of the dielectric substrate; The feed structure includes: sequentially connected fan-shaped branches, connection lines and microstrip feed lines to form a balun structure.