Ultra-wideband structure for Wilkinson power divider

Abstract

The invention relates to an ultra-wideband structure for a Wilkinson power divider, which belongs to the field of ultra-wideband power dividers, and comprises an input port, a first output port and a second output port, each port is provided with a microstrip line and is directly connected with an external circuit through the microstrip line; the slow transition between the microstrip line and the coplanar waveguide is realized through the gradual change microstrip line, and the continuity of high-frequency-band signal transmission is improved. According to the ultra-wideband power divider, the first input branch, the first output branch and the second output branch are connected through the trapezoidal ring, impedance matching and signal isolation are achieved, design parameters of the trapezoidal ring are simple, the effects of reducing the size of the power divider and reducing the parasitic effect are achieved, and the performance of the ultra-wideband power divider is directly improved.

Description

Technical Field

[0001] The invention belongs to the field of ultra-wideband power dividers, and in particular relates to an ultra-wideband structure for a Wilkinson power divider. Background Art

[0002] Wilkinson power divider (power divider) is a passive device that divides one input signal into several output signals. Common Wilkinson power dividers include Figure 1 As shown, it is composed of one or more quarter-wavelength impedance transformers cascaded, which can be used in a variety of microwave applications, such as phased antenna arrays and power amplifiers. With the development of millimeter-wave front-end transceiver systems, ultra-wideband devices have become an important part of these systems, and ultra-wideband power dividers also have broad application prospects.

[0003] In recent years, power dividers with ultra-wideband characteristics have gradually emerged, but the various performances of existing Wilkinson power dividers with ultra-wideband characteristics often restrain each other, making it difficult to balance. For example, an existing power divider uses multi-layer microstrip technology to significantly improve the working bandwidth by placing the input port, short stub and output port of the power divider in layers, but its structure is complex, and the design cost and production cost are high. Another power divider structure cascades multiple impedance transformers at the input port and output port respectively, which also has the effect of improving the working bandwidth, but at the same time it will cause the circuit loss to be relatively large. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides an ultra-wideband structure for a Wilkinson power divider. The technical problem to be solved by the present invention is achieved by the following technical solutions:

[0005] The present invention provides an ultra-wideband structure for a Wilkinson power divider, comprising: an input port, a first output port, and a second output port, wherein the input port is provided with an input microstrip line, and the first output port and the second output port are respectively provided with a first output microstrip line and a second output microstrip line; a first gradient microstrip line is respectively connected to the input microstrip line and the first input coplanar waveguide to form a first input branch; the width of the first gradient microstrip line gradually decreases in a direction away from the input microstrip line; a second gradient microstrip line is respectively connected to the first output coplanar waveguide and the first output microstrip line to form a first output branch; the width of the second gradient microstrip line is gradually reduced in a direction away from the input microstrip line; The width of the third gradient microstrip line gradually decreases in the direction away from the first output microstrip line; the third gradient microstrip line is respectively connected to the second output coplanar waveguide and the second output microstrip line to form a second output branch; the width of the third gradient microstrip line gradually decreases in the direction away from the second output microstrip line; the first output branch and the second output branch are symmetrically arranged; the trapezoidal ring is symmetrical about its horizontal center line, and the width of the trapezoidal ring gradually increases in the direction away from the input microstrip line; the trapezoidal ring is respectively connected to the first input coplanar waveguide, the first output coplanar waveguide and the second output coplanar waveguide for impedance matching; an isolation resistor is connected between the first output coplanar waveguide and the second output coplanar waveguide.

[0006] In one embodiment of the present invention, the first tapered microstrip line, the second tapered microstrip line and the third tapered microstrip line have the same structure, and all include: at least two tapered trapezoidal portions, and the maximum widths of all the tapered trapezoidal portions gradually decrease and are connected in sequence.

[0007] In one embodiment of the present invention, the maximum width of all the tapered trapezoidal portions of the first tapered microstrip line is the same as the width of the input microstrip line, and the minimum width is the same as the width of the first input coplanar waveguide; the maximum width of all the tapered trapezoidal portions of the second tapered microstrip line is the same as the width of the first output coplanar waveguide, and the minimum width is the same as the width of the first output microstrip line; the maximum width of all the tapered trapezoidal portions of the third tapered microstrip line is the same as the width of the second output coplanar waveguide, and the minimum width is the same as the width of the second output microstrip line.

[0008] In one embodiment of the present invention, the widths of the first input coplanar waveguide, the first output coplanar waveguide and the second output coplanar waveguide are all the same.

[0009] In one embodiment of the present invention, the trapezoidal ring is an equilateral trapezoid with a waist length of l a for:

[0010] l a =nπ / β;

[0011] Among them, l a is the waist length of the trapezoidal ring; n is a natural number; β is the wave number of the trapezoidal ring, β = 2π / λ, λ is the wavelength of the trapezoidal ring.

[0012] In one embodiment of the present invention, the length of the minimum width d1 of the trapezoidal ring is:

[0013] d1=2w2;

[0014] Wherein, d1 is the minimum width of the trapezoidal ring; w2 is the width of the first input coplanar waveguide, the first output coplanar waveguide or the second output coplanar waveguide.

[0015] In one embodiment of the present invention, the ultra-wideband structure for the Wilkinson power divider further includes: a stub, and stubs are arranged on both sides of the trapezoidal ring close to the input microstrip line. The two stubs are symmetrically arranged, and the maximum length l1 of each stub is:

[0016] l1 = d2 - d1;

[0017] Wherein, l1 is the maximum length of each section; d2 is the maximum width of the trapezoidal ring.

[0018] In one embodiment of the present invention, the resistance value of the isolation resistor is 100Ω.

[0019] In one embodiment of the present invention, the port impedance between the input port and the first output port or the second output port is 50Ω.

[0020] In one embodiment of the present invention, the input port, the first output port and the second output port are all connected to a ground signal plane; a plurality of metal shielding holes are arranged at intervals on the ground signal plane.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The ultra-wideband structure for the Wilkinson power divider of the present invention has microstrip lines at both the input port and the output port, and can be directly connected to an external circuit through the microstrip lines. The microstrip line and the coplanar waveguide are connected through a gradient microstrip line to achieve a smooth transition between the microstrip line and the coplanar waveguide, reduce losses, and improve the continuity of signal transmission in the high-frequency band. At the same time, the two output branches are symmetrically arranged, both connected to the trapezoidal ring through the coplanar waveguide, and impedance matching and good isolation are achieved through the trapezoidal ring. The design parameters are simple, and the size of the power divider and the parasitic effect can be reduced.

[0023] The ultra-wideband structure for the Wilkinson power divider of the present invention also forms a matching network through symmetrical stubs and trapezoidal rings, which is beneficial to increasing the bandwidth of the Wilkinson power divider, thereby directly improving its working performance.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of an existing one-to-two Wilkinson power divider;

[0026] Figure 2 is a schematic diagram of an ultra-wideband structure for a Wilkinson power divider provided by an embodiment of the present invention;

[0027] Figure 3 is a schematic structural diagram of a gradient microstrip line provided by an embodiment of the present invention;

[0028] Figure 4 is a schematic structural diagram of a trapezoidal ring provided in an embodiment of the present invention;

[0029] Figure 5 is a schematic structural diagram of a cut line provided by an embodiment of the present invention;

[0030] Figure 6 It is a simulation result diagram of an ultra-wideband structure for a Wilkinson power divider provided in an embodiment of the present invention.

[0031] Icon: 1-input microstrip line; 2-first gradient microstrip line; 3-first input coplanar waveguide; 4-trapezoidal ring; 5-cut line; 6-first output coplanar waveguide; 7-second gradient microstrip line; 8-first output microstrip line; 9-second output coplanar waveguide; 10-third gradient microstrip line; 11-second output microstrip line; 12-isolation resistor; 13-ground signal plane; 14-metal shielding hole. DETAILED DESCRIPTION

[0032] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, an ultra-wideband structure for a Wilkinson power divider proposed in accordance with the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] The above and other technical contents, features and effects of the present invention are clearly presented in the following detailed description of the specific implementation modes in conjunction with the accompanying drawings. Through the description of the specific implementation modes, the technical means and effects adopted by the present invention to achieve the predetermined purpose can be more deeply and specifically understood. However, the attached drawings are only for reference and explanation purposes and are not used to limit the technical solutions of the present invention.

[0034] Embodiment 1

[0035] like Figure 2 As shown, this embodiment proposes an ultra-wideband structure for a Wilkinson power divider, including: an input port, a first output port, and a second output port, wherein the input port is provided with an input microstrip line 1, and the first output port and the second output port are respectively provided with a first output microstrip line 8 and a second output microstrip line 11; a first gradient microstrip line 2 is respectively connected to the input microstrip line 1 and the first input coplanar waveguide 3 to form a first input branch; the width of the first gradient microstrip line 2 gradually decreases in a direction away from the input microstrip line 1; a second gradient microstrip line 7 is respectively connected to the first output coplanar waveguide 6 and the first output microstrip line 8 to form a first output branch; the width of the second gradient microstrip line 7 is gradually reduced in a direction away from the input microstrip line 1; The width of the third gradient microstrip line 10 gradually decreases in the direction away from the first output microstrip line 8; the third gradient microstrip line 10 is respectively connected to the second output coplanar waveguide 9 and the second output microstrip line 11 to form a second output branch; the width of the third gradient microstrip line 10 gradually decreases in the direction away from the second output microstrip line 11; the first output branch and the second output branch are symmetrically arranged; the trapezoidal ring 4 is symmetrical about its horizontal center line, and the width of the trapezoidal ring 4 gradually increases in the direction away from the input microstrip line 1; the trapezoidal ring 4 is respectively connected to the first input coplanar waveguide 3, the first output coplanar waveguide 6 and the second output coplanar waveguide 9 for impedance matching; an isolation resistor 12 is connected between the first output coplanar waveguide 6 and the second output coplanar waveguide 9.

[0036] It is worth noting that by arranging the input microstrip line 1, the first output microstrip line 8 and the second output microstrip line 11 at the input port, the first output port and the second output port in sequence, the ultra-wideband structure for the Wilkinson power divider of this embodiment can be directly connected to the external circuit through the microstrip line, thereby realizing direct signal transmission with the external circuit or external circuit components.

[0037] In this embodiment, the first tapered microstrip line 2 , the second tapered microstrip line 7 and the third tapered microstrip line 10 have the same structure, and all include: at least two tapered trapezoidal portions, and the maximum widths of all tapered trapezoidal portions gradually decrease and are connected in sequence.

[0038] In an optional embodiment, the maximum width of all the tapered trapezoidal portions of the first tapered microstrip line 2 is the same as the width of the input microstrip line 1, and the minimum width is the same as the width of the first input coplanar waveguide 3; the maximum width of all the tapered trapezoidal portions of the second tapered microstrip line 7 is the same as the width of the first output coplanar waveguide 6, and the minimum width is the same as the width of the first output microstrip line 8; the maximum width of all the tapered trapezoidal portions of the third tapered microstrip line 10 is the same as the width of the second output coplanar waveguide 9, and the minimum width is the same as the width of the second output microstrip line 11. On this basis, the structures of the first tapered microstrip line 2, the second tapered microstrip line 7 and the third tapered microstrip line 10 are all the same, and are all used to connect microstrip lines and coplanar waveguides.

[0039] Furthermore, the widths of the first input coplanar waveguide 3 , the first output coplanar waveguide 6 and the second output coplanar waveguide 9 are all the same.

[0040] Taking the first gradient microstrip line 2 as an example, Figure 3 As shown, the first tapered microstrip line 2 includes two tapered trapezoidal portions, the maximum widths of the two tapered trapezoidal portions gradually decrease and are connected in sequence, wherein w1 is the width of the input microstrip line 1, w2 is the width of the first input coplanar waveguide 3, and w1>w2, that is, the width of the input microstrip line 1 is greater than the width of the first input coplanar waveguide 3.

[0041] Due to the difference in width, when the RF signal is input and transmitted from the input microstrip line 1, the signal transmission will be discontinuous. In view of this, this embodiment realizes a smooth transition from the input microstrip line 1 to the first input coplanar waveguide 3 by reasonably setting the trapezoidal gradient, reduces the loss, and improves the continuity of signal transmission in the high frequency band. In this way, good field matching can also be achieved, so that the ultra-wideband structure used for the Wilkinson power divider of this embodiment also has good broadband performance.

[0042] It is worth noting that Figure 3 As shown, by comprehensively considering the total length h of the two tapered trapezoidal portions, the width w1 of the input microstrip line 1, and the width w2 of the first input coplanar waveguide 3, a smooth transition in width from the input microstrip line 1 to the first input coplanar waveguide 3 is achieved to reduce the loss; wherein, the total length h of the two tapered trapezoidal portions, the width w1 of the input microstrip line 1, and the width w2 of the first input coplanar waveguide 3 are also affected by factors such as process standards, dielectric materials, dielectric thickness, and operating frequency bands.

[0043] In an optional embodiment, the port impedance between the input port and the first output port or the second output port is 50Ω. On this basis, the first output branch and the second output branch are respectively connected through the trapezoidal ring 4, so that impedance matching is achieved for all output ports. In addition, since the ultra-wideband structure for the Wilkinson power divider of this embodiment is based on the equal-proportional output power, it can be seen from the principle of the Wilkinson power divider that the resistance value R of the isolation resistor 12 is also fixed, and the resistance value of the isolation resistor 12 can be set to 100Ω, and good impedance matching and signal isolation are achieved through the isolation resistor 12. Specifically, the isolation resistor 12 is used to prevent load changes from interfering with other branch parts or ports to ensure that each output port works independently.

[0044] In an optional embodiment, if Figure 4As shown, the trapezoidal ring 4 is symmetrical about its horizontal center line, and the trapezoidal ring 4 is an equilateral trapezoid, and its upper base, lower base, height and width are all used to achieve matching between input and output impedances to achieve good return loss characteristics, as well as to achieve good amplitude and phase balance.

[0045] It is worth noting that the trapezoidal ring 4 is set to an equilateral trapezoid, which makes its structure simple, is conducive to design and simulation, and reduces the design cost. At the same time, the size is also smaller, but it can achieve better effects under the premise of a smaller size, reducing the production cost.

[0046] For example, the waist length l of the trapezoidal ring 4 is a for:

[0047] l a =nπ / β (1);

[0048] Among them, l a is the waist length of the trapezoidal ring 4; n is a natural number; β is the wave number of the trapezoidal ring 4, β=2π / λ, λ is the wavelength of the trapezoidal ring 4.

[0049] Exemplarily, the length of the minimum width d1 of the trapezoidal ring 4 is:

[0050] d1=2w2 (2);

[0051] Wherein, d1 is the minimum width of the trapezoidal ring 4 , that is, the length of the upper base; w2 is the width of the first input coplanar waveguide 3 , the first output coplanar waveguide 6 or the second output coplanar waveguide 9 .

[0052] Further, such as Figure 5 As shown, the ultra-wideband structure for the Wilkinson power divider also includes: a stub 5, and stubs 5 are arranged on both sides of the trapezoidal ring 4 close to the input microstrip line 1, and the two stubs 5 are symmetrically arranged.

[0053] In an optional embodiment, each section line 5 is disposed close to the upper bottom of the trapezoidal ring 4 , and one side edge thereof coincides with an extension line of the upper bottom of the trapezoidal ring 4 .

[0054] In an optional embodiment, the maximum length l1 of each section line 5 is:

[0055] l1=d2-d1 (3);

[0056] Wherein, l1 is the maximum length of each section 5; d2 is the maximum width of the trapezoidal ring 4, that is, the length of the lower base.

[0057] It is worth noting that by comprehensively setting the parameters of the trapezoidal ring 4, the stub 5, and the first input coplanar waveguide 3, the first output coplanar waveguide 6 or the second output coplanar waveguide 9, the minimum width of the trapezoidal ring 4 is linked to the width w2 of the coplanar waveguide, and the sum of the minimum width of the trapezoidal ring 4 and the maximum length of the stub 5 is set to be equal to the maximum width of the trapezoidal ring 4, so that the propagation constant on the upper bottom side of the trapezoidal ring 4 is close to the propagation constant on the lower bottom side, and the ultra-wideband structure for the Wilkinson power divider of this embodiment has a symmetrical structure as a whole, that is, the Wilkinson power divider of this embodiment is symmetrically arranged along its horizontal center line as a whole, thereby achieving phase velocity compensation. The bandwidth of the ultra-wideband structure power divider for the Wilkinson power divider of this embodiment is also significantly improved by the stub 5. In addition, by changing the shape, size and position of the gradient microstrip line, the trapezoidal ring 4 and the stub 5, the generation of high-order modes when the input or output microstrip line is connected to the coplanar waveguide is avoided, thereby solving the problem of signal discontinuity, making the characteristic impedance and propagation constant of the odd and even modes equal or close, thereby achieving impedance matching. It also ensures that each port is matched simultaneously in the same frequency band, thereby improving the bandwidth of the power divider.

[0058] In this embodiment, a higher transmission power is achieved by matching the transmission line impedance to a width of about 50Ω. Under the same dielectric material, the width w1 of the first input coplanar waveguide 3, the first output microstrip line 8, and the second output microstrip line 11 are different. Similarly, the width w2 of the first output coplanar waveguide 6 or the second output coplanar waveguide 9 and the width w3 of each stub 5 are set according to the principle of matching input and output impedances. In addition, they are also affected by factors such as transmission structure, dielectric material, and dielectric thickness. Therefore, in this embodiment, no limitation is made on their specific structural dimensions.

[0059] In an optional embodiment, if Figure 2 As shown, the input port, the first output port and the second output port are all connected to the ground signal plane 13; a plurality of metal shielding holes 14 are arranged at intervals on the ground signal plane 13. Optionally, the material of the ground signal plane 13 and the metal shielding holes 14 is copper.

[0060] Specifically, a plurality of metal shielding holes 14 are arranged around the first input branch, the first output branch and the second output branch on both sides, and the input port, the first output port and the second output port have a coplanar circuit structure, which plays a role in constraining electromagnetic field energy so that microwave signals can be effectively propagated, and also has the function of suppressing higher-order modes and improving signal shielding effects.

[0061] It is worth noting that the combined structure of the output or output microstrip line, the gradient microstrip line, the coplanar waveguide and the trapezoidal ring 4 can also be used in an ultra-wideband active power combining system. In addition, the ultra-wideband structure for the Wilkinson power divider of this embodiment can be used for power distribution or synthesis.

[0062] The principle of the ultra-wideband structure for the Wilkinson power divider of this embodiment is that: the input or output port is provided with a microstrip line for direct connection with external components; a microstrip line with a gradient structure is provided for transition between the coplanar waveguide and the microstrip line of the input or output port, so that the signal is transmitted continuously, thereby improving the continuity of the signal. Compared with a stripline power divider without a transition structure, the power divider using the transition structure is more convenient to connect with the next-level circuit; the trapezoidal ring 4 is used for impedance matching; the short stub 5 is used to increase the bandwidth of the power divider and is also used for impedance matching; the isolation resistor 12 is used for signal isolation.

[0063] It is worth noting that the ultra-wideband structure for the Wilkinson power divider of this embodiment has the advantages of wide bandwidth, large single-input dual-output ports, compact and simple design, good input impedance matching, low insertion loss, simple simulation parameters, etc. Through the hybrid structure of microstrip line and coplanar waveguide, the ultra-wideband structure for the Wilkinson power divider of this embodiment is different from the traditional microstrip line connection structure power divider and the single strip structure power divider, and has good application prospects in millimeter wave front-end transceiver modules.

[0064] For example, the minimum width d1 of the trapezoidal ring 4 is set to 0.6 mm, the maximum width d2 of the trapezoidal ring 4 is set to 1.38 mm, the inner height x1 of the trapezoidal ring 4 is set to 0.92 mm, and the waist length l of the trapezoidal ring 4 is set to a 1mm, and the width w of each side of the trapezoidal ring 4 is equal, both are 0.17mm; the maximum length l1 of each stub 5 is 0.39mm, and the width w3 of each stub 5 is 0.16mm; the width w1 of the input microstrip line 1 is 0.6mm, the width w1 of the first input coplanar waveguide 3, the first output microstrip line 8 and the second output microstrip line 11 are 0.6mm, the width w2 of the first output coplanar waveguide 6 or the second output coplanar waveguide 9 is 0.3mm, and the total length h of the two tapered trapezoidal parts is 0.24mm; the resistance value of the isolation resistor 12 is 100Ω. Its operating frequency band is 30 to 40GHz, and the impedance between the input and output ports is 50Ω.

[0065] On this basis, the ultra-wideband structure for the Wilkinson power divider of this embodiment is simulated in a Rogers RO3003 dielectric substrate with a dielectric constant of 3 using the simulation software HFSS. The results are as follows: Figure 6As shown, the return loss (S11, S22) of each port is better than 15.72dB when the frequency range is 30GHz to 40GHz; the output port isolation (S32) is better than 20dB when the frequency range is 30GHz to 40GHz; at the same time, the insertion loss (S21) is better than 3.45dB when the frequency range is 30GHz to 40GHz. Compared with the simulation results of the traditional Wilkinson power divider in the same frequency band, the ultra-wideband structure used for the Wilkinson power divider of this embodiment has a wider bandwidth and better isolation.

[0066] The ultra-wideband structure for the Wilkinson power divider of the present invention has microstrip lines at both the input port and the output port, and can be directly connected to an external circuit through the microstrip lines. The microstrip line and the coplanar waveguide are connected through a gradient microstrip line to achieve a smooth transition between the microstrip line and the coplanar waveguide, reduce losses, and improve the continuity of signal transmission in the high-frequency band. At the same time, the two output branches are symmetrically arranged, both connected to the trapezoidal ring through the coplanar waveguide, and impedance matching and good isolation are achieved through the trapezoidal ring. The design parameters are simple, and the size of the power divider and the parasitic effect can be reduced.

[0067] The ultra-wideband structure for the Wilkinson power divider of the present invention also forms a matching network through symmetrical stubs and trapezoidal rings, which is beneficial to increasing the bandwidth of the Wilkinson power divider, thereby directly improving its working performance.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant is intended to cover non-exclusive inclusion, so that the article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or device including the elements. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The orientation or position relationship indicated by "up", "down", "left", "right", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0069] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An ultra-wideband structure for a Wilkinson power divider, characterized in that: include: An input port, a first output port and a second output port, wherein the input port is provided with an input microstrip line (1), and the first output port and the second output port are respectively provided with a first output microstrip line (8) and a second output microstrip line (11); A first tapered microstrip line (2) is connected to the input microstrip line (1) and the first input coplanar waveguide (3) respectively to form a first input branch; the width of the first tapered microstrip line (2) gradually decreases in a direction away from the input microstrip line (1); A second tapered microstrip line (7) is connected to the first output coplanar waveguide (6) and the first output microstrip line (8) respectively to form a first output branch; the width of the second tapered microstrip line (7) gradually decreases in a direction away from the first output microstrip line (8); A third gradient microstrip line (10) is respectively connected to the second output coplanar waveguide (9) and the second output microstrip line (11) to form a second output branch; the width of the third gradient microstrip line (10) gradually decreases in a direction away from the second output microstrip line (11); the first output branch and the second output branch are symmetrically arranged; A trapezoidal ring (4) is symmetrical about its horizontal center line, and the width of the trapezoidal ring (4) gradually increases in a direction away from the input microstrip line (1); the trapezoidal ring (4) is respectively connected to the first input coplanar waveguide (3), the first output coplanar waveguide (6) and the second output coplanar waveguide (9) for impedance matching; An isolation resistor (12) is connected between the first output coplanar waveguide (6) and the second output coplanar waveguide (9).

2. The ultra-wideband structure for a Wilkinson power divider according to claim 1, characterized in that: The first tapered microstrip line (2), the second tapered microstrip line (7) and the third tapered microstrip line (10) have the same structure and all comprise at least two tapered trapezoidal portions, wherein the maximum widths of all the tapered trapezoidal portions gradually decrease and are connected in sequence.

3. The ultra-wideband structure for a Wilkinson power divider according to claim 2, characterized in that: The maximum width of all the tapered trapezoidal portions of the first tapered microstrip line (2) is the same as the width of the input microstrip line (1), and the minimum width is the same as the width of the first input coplanar waveguide (3); the maximum width of all the tapered trapezoidal portions of the second tapered microstrip line (7) is the same as the width of the first output coplanar waveguide (6), and the minimum width is the same as the width of the first output microstrip line (8); The maximum width of all the tapered trapezoidal portions of the third tapered microstrip line (10) is the same as the width of the second output coplanar waveguide (9), and the minimum width is the same as the width of the second output microstrip line (11).

4. The ultra-wideband structure for a Wilkinson power divider according to claim 1, characterized in that: The widths of the first input coplanar waveguide (3), the first output coplanar waveguide (6) and the second output coplanar waveguide (9) are all the same.

5. The ultra-wideband structure for a Wilkinson power divider according to claim 4, characterized in that: The trapezoidal ring (4) is an equilateral trapezoid with a waist length of l a for: l a ＝nπ / β； Among them, l a is the waist length of the trapezoidal ring (4); n is a natural number; β is the wave number of the trapezoidal ring (4), β=2π / λ, λ is the wavelength of the trapezoidal ring (4).

6. The ultra-wideband structure for a Wilkinson power divider according to claim 5, characterized in that: The length of the minimum width d1 of the trapezoidal ring (4) is: d1=2w2; Wherein, d1 is the minimum width of the trapezoidal ring (4); w2 is the width of the first input coplanar waveguide (3), the first output coplanar waveguide (6) or the second output coplanar waveguide (9).

7. The ultra-wideband structure for a Wilkinson power divider according to claim 6, characterized in that: Also includes: A stub (5), wherein the stub (5) is arranged on both sides of the trapezoidal ring (4) close to the input microstrip line (1), the two stubs (5) are symmetrically arranged, and the maximum length l1 of each stub (5) is: l1 = d2 - d1; Wherein, l1 is the maximum length of each of the sections (5); d2 is the maximum width of the trapezoidal ring (4).

8. The ultra-wideband structure for a Wilkinson power divider according to claim 1, characterized in that: The resistance value of the isolation resistor (12) is 100Ω.

9. The ultra-wideband structure for a Wilkinson power divider according to claim 1, characterized in that: The port impedance between the input port and the first output port or the second output port is 50Ω.

10. The ultra-wideband structure for a Wilkinson power divider according to claim 1, characterized in that: The input port, the first output port and the second output port are all connected to a ground signal plane (13); a plurality of metal shielding holes (14) are arranged at intervals on the ground signal plane (13).

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