Spatial field power combiner with coaxial to planar transmission line conversion

Abstract

The utility model discloses a space field power combiner with coaxial transmission line to planar transmission line conversion, which comprises an output terminal and a plurality of input terminals, the input part is used for being connected with the plurality of input terminals; the transmission part is connected with the input part so as to match impedance of the plurality of input terminals to the inside; the output terminal is connected between the transmission part and the output terminal; and a stepped transmission portion for implementing impedance conversion and merging of the input terminals and impedance matching with a single output terminal. According to the utility model, through the arrangement of the input part, the transmission part and the step transmission part, impedance conversion of a plurality of input terminals can be realized, then the input terminals are combined, and impedance matching with a single output terminal is realized, so that the power combiner works in a higher microwave frequency band, namely, the bandwidth of the power combiner is fully broadened, and the power combiner has a wide application range. And multiple octaves can be covered.

Description

Technical Field

[0001] The utility model relates to the technical field of power synthesizers, in particular to a space field power synthesizer with coaxial to planar transmission line conversion. Background Art

[0002] A power combiner is a device that can effectively add the output power of multiple units to obtain a higher output power. The larger the number of paths that can be combined, the higher the output power can be obtained at the combined end. Current power combiners have various structures and are suitable for various occasions. However, in general, traditional planar-based combiners are relatively complex in structural implementation, and it is difficult to reduce losses and effectively dissipate heat. Therefore, the synthesis efficiency and combined power are not ideal, and there is no means to optimize the parasitic effects at the high-frequency end. It has the disadvantages of large losses, narrow transmission bandwidth, and low power handling capacity, and is not suitable for high-power synthesis and high-frequency applications. Although the current waveguide-based rectangular waveguide combiner makes up for some of the shortcomings of the planar combiner and has a higher power handling capacity, it cannot cover multiple octaves due to its narrow bandwidth. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a space field power synthesizer with coaxial to planar transmission line conversion, which can fully broaden the bandwidth of the power synthesizer and achieve coverage of multiple octaves.

[0004] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows.

[0005] A space field power synthesizer with coaxial to planar transmission line conversion includes an output terminal and a plurality of input terminals, wherein the space field power synthesizer further includes an input portion for connecting to the plurality of input terminals, a transmission portion connected to the input portion for matching the impedance of the plurality of input terminals to the inside, and a step transmission portion connected between the transmission portion and the output terminal for realizing impedance conversion and merging of the input terminals and impedance matching with a single output terminal;

[0006] The transmission part comprises a cylindrical inner conductor and a cylindrical outer conductor which is sleeved outside the cylindrical inner conductor and coaxially arranged with the cylindrical inner conductor and has a gap; the end of the cylindrical outer conductor away from the input part exceeds the end of the cylindrical inner conductor away from the input part, and the cylindrical inner conductor and the cylindrical outer conductor are uniformly provided with grooves in the circumferential direction, the number of which is the same as the number of input terminals and which are longitudinally arranged, and the physical parts of the cylindrical inner conductor and the cylindrical outer conductor are arranged one by one and form transmission lines therebetween, the number of which is the same as the number of input terminals, for transmitting the radio frequency energy provided by the input terminals to the step transmission part;

[0007] The step transmission part includes a step inner conductor connected to the end of the cylindrical inner conductor and having a diameter gradually decreasing in a direction away from the cylindrical inner conductor, and a step outer conductor connected to the end of the cylindrical outer conductor and having a diameter gradually decreasing in a direction away from the cylindrical outer conductor; the step outer conductor is sleeved on the outside of the step inner conductor and is coaxially arranged with the step inner conductor, and a gap is formed between them to form a step transmission line for realizing impedance conversion and merging of input terminals to match the impedance of a single output terminal.

[0008] Preferably, the input part includes an end support, on the side wall of which a plurality of coaxial conductors are arranged in an array along the circumferential direction and correspond to the transmission lines one by one and protrude from the side wall of the end support; each of the input terminals is connected to the inner conductor of the cylinder via a coaxial conductor.

[0009] Preferably, the side wall of the end support is circumferentially equiangularly distributed with through holes the same in number as the coaxial conductor for passing the coaxial conductor; the coaxial conductor includes an input outer conductor, an insulator is passed through the interior of the input outer conductor, a metal sleeve is passed through the interior of the insulator, and a center conductor is passed through the interior of the metal sleeve; the top end of the center conductor is connected to the input terminal, and the bottom end of the center conductor extends beyond the inner wall of the end support and is connected to one end of the cylindrical inner conductor away from the step inner conductor; the metal sleeve extends beyond the center conductor and is connected to one end of the cylindrical inner conductor away from the step inner conductor.

[0010] Preferably, the input part also includes a conductive cylinder, which includes a large head end whose diameter is adapted to the inner diameter of the cylindrical inner conductor and smaller than the inner diameter of the end support, and a small head end whose diameter is smaller than the large head end; the conductive cylinder is arranged inside the end support and coaxially with the end support, the small head end of the conductive cylinder penetrates into the cylindrical inner conductor, and the outer wall of the large head end of the conductive cylinder is spaced apart from the inner wall of the end support to form a cavity for tuning the stray mode to a frequency above the operating band of the equipment.

[0011] Preferably, the transmission part also includes an inner microwave absorbing material cylinder arranged inside the cylindrical inner conductor and the outer wall of which is closely arranged against the inner wall of the cylindrical inner conductor; the end of the inner microwave absorbing material cylinder close to the input part is inserted into the space formed between the cylindrical inner conductor and the small head end of the conductive cylinder, and the end of the inner microwave absorbing material cylinder away from the input part extends at least to the end of the cylindrical inner conductor.

[0012] Preferably, the transmission part also includes an outer microwave absorbing material cylinder wrapped around the cylindrical outer conductor, the outer microwave absorbing material cylinder is divided into two halves along the longitudinal direction, and one end of the outer microwave absorbing material cylinder away from the input part extends at least to the end of the cylindrical outer conductor.

[0013] Preferably, the power combiner further comprises a shell for connecting with the stepped outer conductor, the outer microwave absorbing material cylinder and the outer wall of the end support so as to enclose the stepped outer conductor, the outer microwave absorbing material cylinder and the end support and expose the coaxial conductor.

[0014] Preferably, the stepped inner conductor includes a first outer conical surface of the stepped inner conductor connected to the end of the cylindrical inner conductor and whose diameter gradually decreases in a direction away from the cylindrical inner conductor, and a second outer conical surface of the stepped inner conductor connected to the end of the first outer conical surface of the stepped inner conductor and whose diameter gradually decreases in a direction away from the first outer conical surface of the stepped inner conductor; the inclination angle of the first outer conical surface of the stepped inner conductor is greater than the inclination angle of the second outer conical surface of the stepped inner conductor.

[0015] Preferably, the stepped outer conductor includes a first inner conical surface of the stepped outer conductor connected to the end of the cylindrical outer conductor and whose diameter gradually decreases in a direction away from the cylindrical outer conductor, and a second inner conical surface of the stepped outer conductor connected to the end of the first inner conical surface of the stepped outer conductor and whose diameter gradually decreases in a direction away from the first inner conical surface of the stepped outer conductor; the inclination angle of the first inner conical surface of the stepped outer conductor is smaller than the inclination angle of the second inner conical surface of the stepped outer conductor, the end of the first inner conical surface of the stepped outer conductor exceeds the end of the first outer conical surface of the stepped inner conductor, and the end of the second inner conical surface of the stepped outer conductor is flush with the end of the second outer conical surface of the stepped inner conductor.

[0016] Preferably, the stepped inner conductor also includes a stepped inner conductor outer cylindrical surface connected to the end of the second outer conical surface of the stepped inner conductor, and the stepped outer conductor also includes a stepped outer conductor inner stepped cylindrical surface connected to the end of the second inner conical surface of the stepped outer conductor; the stepped inner conductor and the stepped outer conductor form an output connector for connecting the output terminal through the stepped inner conductor outer cylindrical surface and the stepped outer conductor inner stepped cylindrical surface.

[0017] Due to the adoption of the above technical scheme, the technical progress achieved by the utility model is as follows.

[0018] The utility model can realize impedance conversion of multiple input terminals by setting the input part, transmission part and step transmission part, and then merge and match the impedance with a single output terminal, so that the power synthesizer can work in a higher microwave frequency band, that is, the bandwidth of the power synthesizer is fully widened to cover multiple octaves. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 It is a split diagram of the utility model;

[0021] Figure 3 For the utility model Figure 1 AA view;

[0022] Figure 4 For the utility model Figure 1 BB view.

[0023] Wherein: 1. Input terminal, 2. End support, 3. Coaxial conductor, 31. Input outer conductor, 32. Insulator, 33. Center conductor, 4. Conductive cylinder, 5. Cylindrical inner conductor, 6. Cylindrical outer conductor, 7. Transmission line, 8. Inner microwave absorbing material cylinder, 9. Outer microwave absorbing material cylinder, 10. Stepped inner conductor, 101. First outer cone surface of the stepped inner conductor, 102. Second outer cone surface of the stepped inner conductor, 103. Outer cylindrical surface of the stepped inner conductor, 11. Stepped outer conductor, 111. First inner cone surface of the stepped outer conductor, 112. Second inner cone surface of the stepped outer conductor, 113. Inner stepped cylindrical surface of the stepped outer conductor, 12. Stepped transmission line, 13. Casing. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] A spatial field power combiner with coaxial to planar transmission line conversion, combined with Figures 1 to 4 As shown, it includes an output terminal, several input terminals 1, an input part, a transmission part and a step transmission part, wherein the input part is used to connect with the several input terminals 1; the transmission part is connected to the input part, so as to match the impedance of the several input terminals 1 to the inside; the step transmission part is connected between the transmission part and the output terminal, and the step transmission part is used to first convert the impedance of the input terminal 1, and then merge and match it with the impedance of a single output terminal.

[0026] The transmission part includes a cylindrical inner conductor 5 and a cylindrical outer conductor 6. The cylindrical outer conductor 6 is sleeved outside the cylindrical inner conductor 5 and is coaxially arranged with the cylindrical inner conductor 5. There is a gap between the cylindrical inner conductor 5 and the cylindrical outer conductor 6 to maintain a uniform spacing. The end of the cylindrical outer conductor 6 away from the input part exceeds the end of the cylindrical inner conductor 5 away from the input part. The cylindrical inner conductor 5 and the cylindrical outer conductor 6 are uniformly provided with slots in the circumferential direction, the same number as the input terminal 1 and longitudinally provided. The cylindrical inner conductor 5 and the cylindrical outer conductor 6 are divided into adjacent pairs of physical parts by the slots provided. The physical parts of the cylindrical inner conductor 5 and the cylindrical outer conductor 6 are arranged one by one and form transmission lines 7, the same number as the input terminal 1, between them. The transmission lines 7 are used to transmit the radio frequency energy provided by the input terminal 1 to the step transmission part.

[0027] The step transmission part includes a step inner conductor 10 and a step outer conductor 11, wherein the step inner conductor 10 is connected to the end of the cylindrical inner conductor 5 by screws, and the diameter of the step inner conductor 10 gradually decreases in the direction away from the cylindrical inner conductor 5; the step outer conductor 11 is connected to the end of the cylindrical outer conductor 6 by screws, and the diameter of the step outer conductor 11 gradually decreases in the direction away from the cylindrical outer conductor 6. The step outer conductor 11 is sleeved on the outside of the step inner conductor 10 and is coaxially arranged with the step inner conductor 10. A step transmission line 12 is formed by a gap between the step inner conductor 10 and the step outer conductor 11. The step transmission line 12 is used to first convert the impedance of the input terminal 1, then merge, and match the impedance of a single output terminal.

[0028] The input part includes an end support 2, and a plurality of coaxial conductors 3 protruding from the side wall of the end support 2 are arranged in an array along the circumferential direction on the side wall of the end support 2, and each input terminal 1 is connected to the coaxial conductor 3 in a one-to-one correspondence. Specifically, the side wall of the end support 2 is equiangularly distributed along the circumferential direction with through holes having the same number as the coaxial conductor 3, and the through holes are used to pass the coaxial conductor 3, so that the coaxial conductor 3 is supported by the end support 2.

[0029] The coaxial conductor 3 includes an input outer conductor 31, an insulator 32 is inserted into the input outer conductor 31, a metal sleeve is inserted into the insulator 32, and a center conductor 33 is inserted into the metal sleeve. The bottom ends of the input outer conductor 31 and the insulator 32 are flush with the inner wall of the end support 2. The top end of the center conductor 33 is connected to the input terminal 1; the bottom end of the center conductor 33 extends beyond the inner wall of the end support 2 and is connected to the end of the cylindrical inner conductor 5 away from the step inner conductor 10, providing matching between the impedance of the coaxial conductor 3 and the impedance of the transmission line 7; the metal sleeve extends beyond the center conductor 33 and is connected to the end of the cylindrical inner conductor 5 away from the step inner conductor 10 to achieve electrical and mechanical connection.

[0030] The input part also includes a conductive cylinder 4, which includes a large end and a small end. The diameter of the large end of the conductive cylinder 4 is adapted to the inner diameter of the cylindrical inner conductor 5 and is smaller than the inner diameter of the end support 2; the diameter of the small end of the conductive cylinder 4 is smaller than the diameter of the large end. The conductive cylinder 4 is arranged inside the end support 2 and coaxially arranged with the end support 2, and the conductive cylinder 4 is connected to the end support 2 by screws. The small end of the conductive cylinder 4 penetrates the cylindrical inner conductor 5, and the outer wall of the large end of the conductive cylinder 4 is spaced apart from the inner wall of the end support 2, thereby forming a cavity, the function of which is to tune the stray mode to a frequency above the operating band of the device. The axial length of the conductive cylinder 4 is set to provide short-circuit impedance.

[0031] The transmission part also includes an inner microwave absorbing material cylinder 8 and an outer microwave absorbing material cylinder 9, both of which are non-conductors. The inner microwave absorbing material cylinder 8 is arranged inside the cylindrical inner conductor 5, and the outer wall of the inner microwave absorbing material cylinder 8 is arranged closely to the inner wall of the cylindrical inner conductor 5. The end of the inner microwave absorbing material cylinder 8 close to the input part is inserted into the space formed between the cylindrical inner conductor 5 and the small end of the conductive cylinder 4; the end of the inner microwave absorbing material cylinder 8 away from the input part at least extends to the end of the cylindrical inner conductor 5. The outer microwave absorbing material cylinder 9 is wrapped around the outside of the cylindrical outer conductor 6, and the end of the outer microwave absorbing material cylinder 9 away from the input part at least extends to the end of the cylindrical outer conductor 6. Specifically, the outer microwave absorbing material cylinder 9 is divided into two halves along the longitudinal direction, so as to facilitate the arrangement around the circumference of the cylindrical outer conductor 6. When a source failure occurs, the unbalanced mode generated will cause its field to expand to the inner microwave absorbing material cylinder 8 and the outer microwave absorbing material cylinder 9 and be damped, thereby not affecting the output of other sources that are still in operation, thereby improving reliability.

[0032] The inner microwave absorbing material cylinder 8 is also thermally connected to the conductive cylinder 4, thereby providing a heat dissipation path for the inner microwave absorbing material cylinder 8 to the external environment through the end support 2, thereby improving reliability. The axial length of the conductive cylinder 4 presents a short-circuit impedance from the perspective of the cavity area composed of the inner microwave absorbing material cylinder 8, the cylindrical inner conductor 5 and the conductive cylinder 4.

[0033] The step inner conductor 10 comprises a first outer conical surface 101 of the step inner conductor and a second outer conical surface 102 of the step inner conductor, wherein the first outer conical surface 101 of the step inner conductor is connected to the end of the cylindrical inner conductor 5, and the diameter of the first outer conical surface 101 of the step inner conductor gradually decreases in the direction away from the cylindrical inner conductor 5; the second outer conical surface 102 of the step inner conductor is connected to the end of the first outer conical surface 101 of the step inner conductor, and the diameter of the second outer conical surface 102 of the step inner conductor gradually decreases in the direction away from the first outer conical surface 101 of the step inner conductor. At the same time, the inclination angle of the first outer conical surface 101 of the step inner conductor is greater than the inclination angle of the second outer conical surface 102 of the step inner conductor.

[0034] The step outer conductor 11 includes a step outer conductor first inner conical surface 111 and a step outer conductor second inner conical surface 112, wherein the step outer conductor first inner conical surface 111 is connected to the end of the cylindrical outer conductor 6, and the diameter of the step outer conductor first inner conical surface 111 gradually decreases in the direction away from the cylindrical outer conductor 6; the step outer conductor second inner conical surface 112 is connected to the end of the step outer conductor first inner conical surface 111, and the diameter of the step outer conductor second inner conical surface 112 gradually decreases in the direction away from the step outer conductor first inner conical surface 111. At the same time, the inclination angle of the step outer conductor first inner conical surface 111 is smaller than the inclination angle of the step outer conductor second inner conical surface 112, the end of the step outer conductor first inner conical surface 111 exceeds the end of the step inner conductor first outer conical surface 101, and the end of the step outer conductor second inner conical surface 112 is flush with the end of the step inner conductor second outer conical surface 102.

[0035] The stepped inner conductor 10 further includes a stepped inner conductor outer cylindrical surface 103, and the stepped outer conductor 11 further includes a stepped outer conductor inner stepped cylindrical surface 113. The inner conductor outer cylindrical surface 103 is connected to the end of the stepped inner conductor second outer conical surface 102; the stepped outer conductor inner stepped cylindrical surface 113 is connected to the end of the stepped outer conductor second inner conical surface 112. The stepped inner conductor 10 and the stepped outer conductor 11 form an output connector through the stepped inner conductor outer cylindrical surface 103 and the stepped outer conductor inner stepped cylindrical surface 113, and the output connector is used to connect the output terminal.

[0036] The first outer conical surface 101 of the inner conductor, the second outer conical surface 102 of the stepped inner conductor and the outer cylindrical surface 103 of the stepped inner conductor form a first step surface, and the first inner conical surface 111 of the stepped outer conductor, the second inner conical surface 112 of the stepped outer conductor and the inner step cylindrical surface 113 of the stepped outer conductor form a second step surface. The stepped transmission line 12 is formed by the step gap between the first step surface and the second step surface, and the impedance of several input terminals 1 can be increased through impedance conversion, so that the impedance after parallel connection matches the impedance of a single output terminal.

[0037] When the utility model is used, the following settings can be made: Figures 1 to 4 The eight coaxial conductors 3 shown are used to connect eight input terminals 1, and the impedance of the eight input terminals 1 is fifty ohms. In order to avoid the impedance of the input terminal 1 being eight times different from the impedance of the output terminal after the eight-way parallel connection, which would prevent the energy from being transmitted normally, the impedance of the eight input terminals 1 is matched to the inside through the transmission line 7, and then the impedance conversion is achieved through the multiple steps of the step transmission line 12, so that the impedance of each transmission line 7 is four hundred ohms, and finally they are combined to output a single fifty-ohm impedance that matches the impedance of a single output terminal, thereby enabling the power combiner to operate in a higher microwave frequency band, that is, the bandwidth of the power combiner is fully widened to cover multiple octaves.

[0038] The structure of the present power combiner can also be used as a power divider for obtaining multiple identical microwave energy sources from one source connected to the output terminal, and the output load is connected to the input terminal 1, and the obtained microwave energy sources will have the same amplitude and phase within a wide frequency band.

Claims

1. A space field power synthesizer with coaxial to planar transmission line conversion, comprising an output terminal and a plurality of input terminals (1), characterized in that: It also includes an input part for connecting to a plurality of input terminals (1), a transmission part connected to the input part to match the impedance of the plurality of input terminals (1) to the inside, and a step transmission part connected between the transmission part and the output terminal to achieve impedance conversion and merging of the input terminals (1) and impedance matching with a single output terminal; The transmission part comprises a cylindrical inner conductor (5) and a cylindrical outer conductor (6) which is sleeved outside the cylindrical inner conductor (5) and is coaxially arranged with the cylindrical inner conductor (5) and has a gap; the end of the cylindrical outer conductor (6) away from the input part exceeds the end of the cylindrical inner conductor (5) away from the input part; the cylindrical inner conductor (5) and the cylindrical outer conductor (6) are uniformly provided with slots in the circumferential direction, the same number as the input terminal (1) and longitudinally provided; the various physical parts of the cylindrical inner conductor (5) and the cylindrical outer conductor (6) are arranged one by one and form transmission lines (7) therebetween, the same number as the input terminal (1) and used to transmit radio frequency energy provided by the input terminal (1) to the step transmission part; The step transmission part comprises a step inner conductor (10) connected to the end of the cylindrical inner conductor (5) and having a diameter gradually decreasing in a direction away from the cylindrical inner conductor (5), and a step outer conductor (11) connected to the end of the cylindrical outer conductor (6) and having a diameter gradually decreasing in a direction away from the cylindrical outer conductor (6); the step outer conductor (11) is sleeved outside the step inner conductor (10) and is coaxially arranged with the step inner conductor (10), and a gap is formed between them to form a step transmission line (12) for realizing impedance conversion and merging of the input terminal (1) to match the impedance of a single output terminal.

2. The spatial field power combiner with coaxial to planar transmission line conversion according to claim 1, characterized in that: The input part comprises an end support (2), on the side wall of the end support (2) a plurality of coaxial conductors (3) are arranged in an array along the circumferential direction and are arranged in a one-to-one correspondence with the transmission lines (7) and protrude from the side wall of the end support (2); each of the input terminals (1) is connected to the cylindrical inner conductor (5) via the coaxial conductor (3).

3. The spatial field power combiner with coaxial to planar transmission line conversion according to claim 2, characterized in that: The side wall of the end support (2) is provided with through holes, which are distributed equiangularly in the circumferential direction and are the same in number as the coaxial conductor (3) and are used to pass the coaxial conductor (3); the coaxial conductor (3) comprises an input outer conductor (31), an insulator (32) is passed through the interior of the input outer conductor (31), a metal sleeve is passed through the interior of the insulator (32), and a center conductor (33) is passed through the interior of the metal sleeve; the top end of the center conductor (33) is connected to the input terminal (1), and the bottom end of the center conductor (33) extends beyond the inner wall of the end support (2) and is connected to an end of the cylindrical inner conductor (5) away from the step inner conductor (10); the metal sleeve extends beyond the center conductor (33) and is connected to an end of the cylindrical inner conductor (5) away from the step inner conductor (10).

4. The spatial field power combiner with coaxial to planar transmission line conversion according to claim 3, characterized in that: The input part also includes a conductive cylinder (4), the conductive cylinder (4) including a large end whose diameter matches the inner diameter of the cylindrical inner conductor (5) and is smaller than the inner diameter of the end support (2), and a small end whose diameter is smaller than the large end; the conductive cylinder (4) is arranged inside the end support (2) and is coaxially arranged with the end support (2), the small end of the conductive cylinder (4) penetrates the cylindrical inner conductor (5), and the outer wall of the large end of the conductive cylinder (4) is spaced apart from the inner wall of the end support (2) to form a cavity for tuning the stray mode to a frequency above the device operation band.

5. The spatial field power combiner with coaxial to planar transmission line conversion according to claim 4, characterized in that: The transmission part further comprises an inner microwave absorbing material cylinder (8) which is arranged inside the cylindrical inner conductor (5) and whose outer wall is closely arranged with the inner wall of the cylindrical inner conductor (5); an end of the inner microwave absorbing material cylinder (8) close to the input part is inserted into the space formed between the cylindrical inner conductor (5) and the small end of the conductive cylinder (4), and an end of the inner microwave absorbing material cylinder (8) far from the input part extends at least to the end of the cylindrical inner conductor (5).

6. The spatial field power combiner with coaxial to planar transmission line conversion according to claim 1, characterized in that: The transmission part also includes an outer microwave absorbing material cylinder (9) wrapped around the cylindrical outer conductor (6), the outer microwave absorbing material cylinder (9) being divided into two halves along the longitudinal direction, and an end of the outer microwave absorbing material cylinder (9) away from the input part at least extending to the end of the cylindrical outer conductor (6).

7. The spatial field power combiner with coaxial to planar transmission line conversion according to claim 6, characterized in that: The power combiner also includes a housing (13) for connecting to the outer wall of the stepped outer conductor (11), the outer microwave absorbing material cylinder (9) and the end support (2) so as to enclose the stepped outer conductor (11), the outer microwave absorbing material cylinder (9) and the end support (2) and expose the coaxial conductor (3).

8. The spatial field power combiner with coaxial to planar transmission line conversion according to claim 1, characterized in that: The step inner conductor (10) comprises a first outer conical surface (101) of the step inner conductor connected to the end of the cylindrical inner conductor (5) and whose diameter gradually decreases in a direction away from the cylindrical inner conductor (5), and a second outer conical surface (102) of the step inner conductor connected to the end of the first outer conical surface (101) of the step inner conductor and whose diameter gradually decreases in a direction away from the first outer conical surface (101) of the step inner conductor; the inclination angle of the first outer conical surface (101) of the step inner conductor is greater than the inclination angle of the second outer conical surface (102) of the step inner conductor.

9. The spatial field power combiner with coaxial to planar transmission line conversion according to claim 8, characterized in that: The step outer conductor (11) comprises a first inner conical surface (111) of the step outer conductor connected to the end of the cylindrical outer conductor (6) and whose diameter gradually decreases in a direction away from the cylindrical outer conductor (6), and a second inner conical surface (112) of the step outer conductor connected to the end of the first inner conical surface (111) of the step outer conductor and whose diameter gradually decreases in a direction away from the first inner conical surface (111) of the step outer conductor; the inclination angle of the first inner conical surface (111) of the step outer conductor is smaller than the inclination angle of the second inner conical surface (112) of the step outer conductor, the end of the first inner conical surface (111) of the step outer conductor exceeds the end of the first outer conical surface (101) of the step inner conductor, and the end of the second inner conical surface (112) of the step outer conductor is flush with the end of the second outer conical surface (102) of the step inner conductor.

10. The spatial field power combiner with coaxial to planar transmission line conversion according to claim 9, characterized in that: The step inner conductor (10) further comprises a step inner conductor outer cylindrical surface (103) connected to the end of the second outer conical surface (102) of the step inner conductor, and the step outer conductor (11) further comprises a step outer conductor inner stepped cylindrical surface (113) connected to the end of the second inner conical surface (112) of the step outer conductor; the step inner conductor (10) and the step outer conductor (11) form an output connector for connecting an output terminal through the step inner conductor outer cylindrical surface (103) and the step outer conductor inner stepped cylindrical surface (113).

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