Microwave four-path power combiner based on sling

Abstract

The utility model discloses a microwave four-path power combiner based on a sling, which comprises an aluminum cavity and a copper strip conductor erected in the aluminum cavity, one end of the copper strip conductor is provided with four sections of symmetrically distributed input copper strips and a section of grounding copper strip connected with the aluminum cavity, the grounding copper strip is a 1 / 4 wavelength impedance line, and the other end of the copper strip conductor is connected with the aluminum cavity. The other end of the copper strip conductor is provided with an output copper strip. According to the utility model, the 1 / 4 wavelength impedance line is short-circuited and grounded, and the heat is conducted away while the synthetic transmission index is not influenced as much as possible, thereby improving the power capacity and stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to power amplifier technical field, specifically relates to a microwave four -way power combiner based on the suspension band. BACKGROUND

[0002] In the current microwave solid state source application field, as a key component, the performance of power combiner plays a decisive role in the operation effect of the whole system. As for the current common technical scheme, the power combiner adopted by the traditional microwave solid state source is mostly of the type based on printed circuit board (PCB), specifically including microstrip Wilkinson combiner on PCB and microstrip T-type impedance transformation combiner on PCB.

[0003] However, this combiner scheme based on PCB has many significant disadvantages. From the aspect of loss, due to the limitation of PCB material properties and microstrip line structure, a large amount of energy loss will be generated in the transmission process of signals, which not only reduces the efficiency of power combination, but also leads to energy waste. In terms of power capacity, the performance of such combiner is also unsatisfactory, and its power capacity is relatively low. Through actual test and application verification, it cannot meet the use demand of more than 1000W actual power. This limitation makes the power combiner based on PCB difficult to play an ideal performance in some occasions with higher power requirements, such as high-power radar, communication base station and other application scenarios, and even cannot work normally.

[0004] In order to overcome the limitations of the above-mentioned combiner based on PCB, the industry has developed a cavity combiner based on suspension band. This scheme can be regarded as a special strip line structure in principle, which uses copper band as transmission inner conductor, uses air as medium (the relative dielectric constant of air Er=1.001), and uses aluminum cavity as ground layer. This design improves the performance of power combiner to some extent, and compared with the traditional PCB scheme, it has certain improvement in power capacity.

[0005] However, through a large number of tests and long-term operation observation in actual application scenarios, it is found that the cavity combiner based on suspension band still exposes serious problems when facing actual use of larger power. Since in the high-power running state, the copper band inner conductor transmits large-power signals to generate more heat, and the heat dissipation capacity of air medium is relatively limited, although the aluminum cavity ground layer can assist heat dissipation, the overall heat dissipation effect is still not ideal, resulting in the gradual accumulation of heat inside the combiner. This heat accumulation phenomenon will trigger a series of chain reactions, first causing the performance of electronic components inside the combiner to change, and then affecting the stability of the whole combiner work. In the extreme case, the high temperature caused by heat accumulation may even cause the electronic components to burn out, making the combiner completely ineffective, and bringing serious failure to the whole microwave solid state source system. UTILITY MODEL CONTENT

[0006] In order to overcome the problem of heat accumulation leading to instability and even burning in the practical use of the suspension band impedance conversion combiner in the prior art, the utility model provides a microwave four-way power combiner based on suspension band, uses 1 / 4 wavelength impedance line short circuit ground, removes heat while trying not to affect the synthesis transmission index, thereby improving the power capacity and stability.

[0007] The utility model technical scheme is as follows:

[0008] A microwave four-way power combiner based on suspension band, including aluminium cavity and the copper band conductor of erecting in aluminium cavity, one end of copper band conductor is provided with four symmetrical distribution input copper bands and a ground copper band connected with aluminium cavity, the ground copper band is 1 / 4 wavelength impedance line, the other end of copper band conductor is provided with an output copper band.

[0009] As a preferred scheme of the utility model, the aluminium cavity and the copper band conductor are both symmetrical structures.

[0010] As a preferred scheme of the utility model, the ground copper band is arranged in the middle part of one end of the copper band conductor.

[0011] As a preferred scheme of the utility model, the copper band conductor is suspended and erected in the center of the vertical position of the aluminium cavity through the PTFE insulating support column.

[0012] As a preferred scheme of the utility model, the middle part of the copper band conductor is provided with two first copper bands which are symmetrically distributed with the ground copper band as the center point, one end of the first copper band is connected with two input copper bands respectively through a second copper band, the other end of the first copper band is connected with the ground copper band, and the ground copper band is also connected with the output copper band through a third copper band.

[0013] As a preferred scheme of the utility model, the input copper band, the output copper band and the first copper band have the same width, and the impedance is 50 ohms, the ground copper band, the second copper band and the third copper band have the same width, and the impedance is Ohm.

[0014] As a preferred scheme of the utility model, the input copper band, the output copper band, the ground copper band, the first copper band, the second copper band and the third copper band have the same thickness.

[0015] As a preferred scheme of the utility model, the end of four input copper bands is respectively connected with four input ports.

[0016] As a preferred scheme of the utility model, the end of the output copper band is connected with an output port.

[0017] As a preferred scheme of the utility model, the output port is a 7 / 16 joint.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] The microwave four-way power combiner based on the suspension band increases a 1 / 4 wavelength impedance line (namely, the ground copper band) ground, according to the 1 / 4 wavelength impedance transformation principle, the impedance is infinite in the direction of the ground for the signal in the target frequency band, so the synthesis and transmission of the microwave signal are not affected, but the copper band conductor is grounded in a large area here, so that the heat can be conducted away, greatly reducing the temperature of the copper band conductor, thereby improving the power capacity and stability of the combiner. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0021] Figure 1 It is the structure schematic view of the microwave four-way power combiner based on the suspension band in an embodiment of the utility model;

[0022] Figure 2 It is the structure schematic view of the copper band conductor in an embodiment of the utility model;

[0023] Figure 3 It is the impedance schematic view of the copper band conductor in an embodiment of the utility model.

[0024] In the drawings,

[0025] 1, aluminum cavity;2, copper band conductor;21, input copper band;22, ground copper band;221, ground copper sheet;2211, screw hole;23, output copper band;24, first copper band;25, second copper band;26, third copper band;3, input port;4, output port;5, PTFE insulating support column. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. It is declared at the same time that the examples described below are only used to explain the utility model and do not limit the utility model.

[0027] It should be noted that the terms "arrangement", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise explicitly limited. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship commonly placed when the product of the application is used, which is only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, structure and operation, so it cannot be understood as limiting the application. The terms "first", "second", "third" are only used for the purpose of convenience, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features.

[0028] Please refer to Figures 1 to 3 The embodiment provides a microwave four-way power combiner based on a suspension belt, which comprises an aluminum cavity 1 and a copper belt conductor 2 arranged in the aluminum cavity 1. One end of the copper belt conductor 2 is provided with four symmetrical input copper belts 21 and one ground copper belt 22 connected with the aluminum cavity 1. The four input copper belts 21 are respectively connected with four input ports 3. The ground copper belt 22 is arranged at the middle part of the end of the copper belt conductor 2, and the ground copper belt 22 is a 1 / 4 wavelength impedance line. The other end of the copper belt conductor 2 is provided with one output copper belt 23, and the end of the output copper belt 23 is connected with an output port 4. The output port 4 preferably adopts a 7 / 16 connector. By arranging the ground copper belt 22 at the middle part of one end of the copper belt conductor 2, and the ground copper belt 22 being a 1 / 4 wavelength impedance line, large-area grounding is realized. Due to the good heat conductivity of copper, the heat generated by the copper belt conductor 2 during the transmission of microwave signals can be effectively conducted out, greatly reducing the temperature of the copper belt conductor 2.

[0029] Compared with other suspension impedance transformation combiners, the above-mentioned suspension-based microwave four-way power combiner is additionally provided with a 1 / 4 wavelength impedance line (i.e., the ground copper strip 22) for grounding. According to the 1 / 4 wavelength impedance transformation principle, the impedance of the signal in the target frequency band to the ground is infinite, so the synthesis and transmission of the microwave signal will not be affected. However, the copper conductor 2 is grounded at a large area at this position, so the heat can be conducted away, greatly reducing the temperature of the copper conductor 2, thereby improving the power capacity and stability of the combiner.

[0030] Referring to Figure 1 , Figure 2 In an embodiment, the aluminum cavity 1 and the copper conductor 2 are both symmetrical structures. The symmetrical structure can make the electrical characteristics of each path more uniform during the transmission of the microwave signal, which helps to ensure that the phase change of each path during the transmission of the signal remains consistent, reduces signal reflection caused by differences in transmission paths, and enables the signal to propagate more smoothly in the copper conductor 2, thereby improving the efficiency of power synthesis. In addition, the symmetrical structure of the aluminum cavity 1 and the copper conductor 2 makes the path of heat transfer from the copper conductor 2 to the aluminum cavity 1 and then to the outside more regular and optimized.

[0031] Referring to Figure 1 In an embodiment, the copper conductor 2 is suspended by the PTFE insulating support column 5 at the center of the vertical position of the aluminum cavity 1. The PTFE insulating support column 5 has excellent electrical insulation performance, with low and stable relative dielectric constant, which can effectively isolate the connection between the copper conductor 2 (except for the ground copper strip 22) and the aluminum cavity 1, prevent short circuit, and ensure the stability and purity of the microwave signal during transmission in the copper conductor 2, ensuring that the power synthesis process is not adversely affected by external electrical factors. By suspending the copper conductor 2 at the center of the vertical position of the aluminum cavity 1, the heat dissipation of the copper conductor 2 to the surrounding aluminum cavity 1 is more uniform, and local overheating does not occur, which helps to maintain the thermal stability of the entire power combiner and prolong the service life of the equipment.

[0032] In an embodiment, the end of the ground copper strip 22 is provided with a ground copper sheet 221, which is connected to the bottom of the aluminum cavity 1 by a screw, and the ground copper sheet 221 is provided with a screw hole 2211 matched with the screw. The ground copper sheet 221 increases the contact area between the ground copper strip 22 and the bottom of the aluminum cavity 1, making the grounding connection more stable and ensuring the reliability of the large-area grounding, thereby ensuring that the heat generated by the copper conductor 2 can be effectively conducted away, maintaining a low temperature of the copper conductor 2 and improving the power capacity and stability of the combiner. The screw connection method facilitates accurate installation of the ground copper sheet 221 to the bottom of the aluminum cavity 1 during equipment assembly, and also facilitates disassembly and replacement of related components during later maintenance or repair of the equipment, improving the maintainability of the equipment.

[0033] Please refer to Figures 1 to 3 In one embodiment, the middle part of the copper strip conductor 2 is provided with two first copper strips 24 which are symmetrically distributed with the ground copper strip 22 as the center point, one end of the first copper strip 24 is connected with the two input copper strips 21 through a second copper strip 25 respectively, the other end of the first copper strip 24 is connected with the ground copper strip 22, and the ground copper strip 22 is further connected with the output copper strip 23 through a third copper strip 26. The thickness of the input copper strip 21, the output copper strip 23, the ground copper strip 22, the first copper strip 24, the second copper strip 25 and the third copper strip 26 is the same. The width of the input copper strip 21, the output copper strip 23 and the first copper strip 24 is W1, and the impedance is 50 ohms, the width of the ground copper strip 22, the second copper strip 25 and the third copper strip 26 is W2, and the impedance is ohms. The length L of the ground copper strip 22, the second copper strip 25 and the third copper strip 26 is the actual length corresponding to 90 degrees of electrical length, which can be calculated by Er and frequency. In radio frequency and microwave systems, 50 ohms is a common standard impedance, which can be well matched with most radio frequency devices and transmission lines, reducing signal reflection and improving signal transmission efficiency. While The impedance of 50 ohms is usually used to realize specific impedance transformation function, which helps to allocate and match power in the process of signal synthesis, so that each signal can be better synthesized at the output end, improving the effect of power synthesis.

[0034] The impedance formula of the copper strip impedance Z is:

[0035]

[0036] Wherein, the air Er = 1.001, T is the thickness of the copper strip, W is the width of the copper strip, and H is the height of the cavity (the height from the upper and lower edges of the aluminum cavity 1 to the copper strip conductor).

[0037] In actual application, H and T are generally determined according to the required power capacity, then W1 and W2 are calculated according to the above impedance formula, and finally the modeling simulation is carried out in the simulation software to correct the above parameters. Due to the influence of actual electromagnetic environment and manufacturing process, etc., the parameters obtained by theoretical calculation may have certain deviation from the actual situation. Through modeling simulation by simulation software, the performance of power synthesizer in actual work can be simulated, and the deficiencies in parameter design can be found and corrected, so as to improve the actual performance and reliability of power synthesizer.

[0038] For other parameters, such as the length of the 50 ohm copper strip of each section 50, the width of the aluminum cavity 1, the size and shape of the PTFE insulating support column 5, etc. will also affect the simulation result index in the simulation, but the influence is relatively subtle and theoretically cannot be quantified by formula, so the utility model does not discuss it here.

[0039] It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the utility model.

[0040] The utility model patent has been exemplarily described above in combination with the drawings, and obviously the implementation of the utility model patent is not limited by the above-mentioned mode, as long as various improvements are made by adopting the method concept and technical scheme of the utility model patent, or the concept and technical scheme of the utility model patent is directly applied to other occasions without improvement, all of which are within the protection scope of the utility model.

Claims

1. A suspension-based microwave four-way power combiner comprising an aluminum cavity and a copper strap conductor mounted within the aluminum cavity, characterized in that, One end of the copper band conductor is provided with four input copper bands symmetrically distributed and one ground copper band connected with the aluminum cavity, the ground copper band is a 1 / 4 wavelength impedance line, the other end of the copper band conductor is provided with one output copper band.

2. The strapline-based microwave four-way power combiner of claim 1, wherein, The aluminum cavity and the copper band conductor are both symmetric structures.

3. The strapline-based microwave four-way power combiner of claim 1, wherein, The ground copper band is arranged in the middle of one end of the copper band conductor.

4. The strapline-based microwave four-way power combiner of claim 1, wherein, The copper band conductor is suspended and erected in the center of the vertical position of the aluminum cavity through a PTFE insulation support column.

5. The strapline-based microwave four-way power combiner of claim 1, wherein, The middle of the copper band conductor is provided with two first copper bands symmetrically distributed with the ground copper band as the center point, one end of the first copper band is connected with two input copper bands respectively through a second copper band, the other end of the first copper band is connected with the ground copper band, and the ground copper band is further connected with the output copper band through a third copper band.

6. The strapline-based microwave four-way power combiner of claim 5, wherein, The input copper strip, the output copper strip and the first copper strip have the same width and the same impedance of 50 ohms, the ground copper strip, the second copper strip and the third copper strip have the same width and the same impedance of ohms.

7. The strapline-based microwave four-way power combiner of claim 5 or 6, wherein, The input copper band, the output copper band, the ground copper band, the first copper band, the second copper band and the third copper band have the same thickness.

8. The strapline-based microwave four-way power combiner of claim 1, wherein, The end of each of the four input copper bands is connected with an input port.

9. The strapline-based microwave four-way power combiner of claim 1, wherein, The end of the output copper band is connected with an output port.

10. The strapline-based microwave four-way power combiner of claim 9, wherein, The output port is a 7 / 16 connector.

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