Millimeter wave spread spectrum waveguide coaxial converter

Abstract

The utility model discloses a millimeter wave spread spectrum waveguide coaxial converter, and relates to the technical field of waveguide conversion devices. The coaxial converter comprises an upper cavity and a lower cavity, a waveguide cavity is formed between the upper cavity and the lower cavity, and a boss is formed in the waveguide cavity; the converter further comprises a connector, the connector is fixed on the upper cavity, and a coaxial inner conductor of the connector is inserted into a waveguide cavity formed between the upper cavity and the lower cavity. The converter further comprises a tuning screw, the tuning screw is located on the outer side of the lower cavity, the upper side end portion of the tuning screw penetrates through the lower cavity to enter the waveguide cavity, and the upper side end portion of the tuning screw is located between the boss and the lower side end portion of the coaxial inner conductor. The coaxial converter has the advantages of being good in spread spectrum performance, wide in working frequency band and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of waveguide conversion devices, in particular to a millimeter wave spread spectrum waveguide coaxial converter with good spread spectrum performance. Background Art

[0002] Waveguide coaxial converters play an important role in the microwave field, mainly realizing the mutual conversion between coaxial signals and waveguide signals. The coaxial inner conductor (connector extends into the waveguide cavity) can be regarded as a probe in the waveguide. The essence of energy exchange between the probe and the waveguide is the excitation process of the probe in the waveguide. In the waveguide, the insertion of the probe will cause discontinuity, and then generate an infinite number of high-order modes. However, only the main mode can be transmitted in the waveguide, and the high-order modes that cannot be transmitted will gather around the probe to produce a reactance effect, resulting in poor spread spectrum performance. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a millimeter wave spread spectrum waveguide coaxial converter with good spread spectrum performance and wide working frequency band.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a millimeter wave spread spectrum waveguide coaxial converter, comprising an upper cavity and a lower cavity, a waveguide cavity is formed between the upper cavity and the lower cavity, and a boss is formed in the waveguide cavity; the converter also includes a connector, the connector is fixed on the upper cavity, and the coaxial inner conductor of the connector is inserted into the waveguide cavity formed between the upper cavity and the lower cavity; the converter also includes a tuning screw, the tuning screw is located on the outside of the lower cavity, the upper end of the tuning screw passes through the lower cavity into the waveguide cavity, and the upper end of the tuning screw is located between the boss and the lower end of the coaxial inner conductor.

[0005] A further technical solution is that one end of the waveguide cavity is closed and the other end has an opening, and the distance between the lower surface of the upper cavity of the waveguide cavity close to the opening and the upper surface of the lower cavity first remains unchanged, then gradually increases, and then remains unchanged until the opening of the waveguide cavity.

[0006] A further technical solution is that: a first horizontal plane is formed on the lower surface of the upper cavity starting from the inner end, a first inclined plane extending upward is connected to one side of the first horizontal plane, a second horizontal plane is connected to one side of the first inclined plane, and the second horizontal plane extends to the opening of the waveguide cavity; a third horizontal plane is formed on the upper surface of the lower cavity starting from the inner end, a second inclined plane extending downward is connected to one side of the third horizontal plane, a fourth horizontal plane is connected to one side of the second inclined plane, and the fourth horizontal plane extends to the opening of the waveguide cavity.

[0007] A further technical solution is that a semicircular flange connection part is formed at the right end of the upper cavity and the lower cavity, and a positioning hole and a connection hole are formed on the semicircular flange connection part.

[0008] The beneficial effects of adopting the above technical solution are: the converter described in the present application forms a boss in the waveguide cavity for impedance matching, and is provided with a tuning screw with adjustable height. The above setting can effectively adjust the impedance matching and optimize the spread spectrum performance, thereby expanding the operating frequency band and increasing the operating frequency; the waveguide cavity of the converter is provided with an inner surface with a certain slope above and below the transition section between the cavity and the standard output waveguide port, which further optimizes the spread spectrum performance, thereby expanding the operating frequency band and increasing the operating frequency, so that the operating frequency band range of the converter can reach 24-50GHz, which is very suitable for 5G millimeter wave related test applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0010] Figure 1 It is a three-dimensional structural schematic diagram of the converter described in the embodiment of the utility model;

[0011] Figure 2 It is a schematic diagram of the main structure of the converter according to the embodiment of the utility model;

[0012] Figure 3 It is a right side structural schematic diagram of the converter described in the embodiment of the utility model;

[0013] Figure 4 It is a left-side structural schematic diagram of the converter described in the embodiment of the utility model;

[0014] Figure 5 is a schematic cross-sectional structural diagram of the converter according to an embodiment of the utility model;

[0015] Figure 6 It is a schematic diagram of the exploded structure of the converter described in the embodiment of the utility model;

[0016] Figure 7 It is a schematic structural diagram of the upper cavity of the converter according to the embodiment of the utility model;

[0017] Figure 8 It is a structural schematic diagram of the lower cavity of the converter according to the embodiment of the utility model;

[0018] Among them: 1. upper cavity; 2. lower cavity; 3. waveguide cavity; 4. boss; 5. connector; 6. coaxial inner conductor; 7. tuning screw; 8. semicircular flange connection; 9. positioning hole; 10. nut; 11. positioning pin. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] like Figure 1-Figure 8 As shown, an embodiment of the utility model discloses a millimeter-wave spread spectrum waveguide coaxial converter, comprising an upper cavity 1 and a lower cavity 2, wherein the upper cavity 1 and the lower cavity 2 are made of metal materials; the upper cavity 1 and the lower cavity 2 are fixedly connected together by screws and screw holes that cooperate with each other, and after the two are connected together, a waveguide cavity 3 is formed between the upper cavity 1 and the lower cavity 2, wherein one end of the waveguide cavity 3 is closed and the other end has an opening; a boss 4 is formed on the upper surface of the lower cavity 2 in the waveguide cavity 3; the converter also includes a connector 5, and a connecting thread is formed on the outer periphery of the connector 5 for conveniently connecting the coaxial converter to a signal source through the connector 5.

[0022] The connector 5 is fixed on the upper cavity 1, and the coaxial inner conductor 6 of the connector 5 is inserted into the waveguide cavity 3 formed between the upper cavity 1 and the lower cavity 2; the converter also includes a tuning screw 7, which is located on the outside of the lower cavity 2, and the upper end of the tuning screw 7 passes through the lower cavity 2 and enters the waveguide cavity 3, and the upper end of the tuning screw 7 is located between the boss 4 and the lower end of the coaxial inner conductor 6. The outer end of the tuning screw 7 is provided with a nut 10, and the height of the tuning screw 7 in the waveguide cavity 3 can be adjusted by adjusting the nut 10. Figure 5 and 8 As shown, the height of the boss 4 is smaller than the height of the upper end of the tuning screw 7 , and there is a certain gap between the boss 4 , the coaxial inner conductor 6 and the tuning screw 7 .

[0023] Further, such as Figure 5 As shown, one end of the waveguide cavity 3 is closed, and the other end has an opening, and the distance between the lower surface of the upper cavity 1 of the waveguide cavity 3 close to the opening and the upper surface of the lower cavity 2 is first kept constant, then gradually increases, and then remains constant until the opening of the waveguide cavity 3. Furthermore, the lower surface of the upper cavity 1 is formed with a first horizontal plane from the inner end, and a first inclined plane extending upward is connected to one side of the first horizontal plane, and a second horizontal plane is connected to one side of the first inclined plane, and the second horizontal plane extends to the opening of the waveguide cavity 3; the upper surface of the lower cavity 2 is formed with a third horizontal plane from the inner end, and a second inclined plane extending downward is connected to one side of the third horizontal plane, and a fourth horizontal plane is connected to one side of the second inclined plane, and the fourth horizontal plane extends to the opening of the waveguide cavity 3.

[0024] like Figure 7-Figure 8 As shown, a semicircular flange connection part 8 is formed at the right end of the upper cavity 1 and the lower cavity 2, and a positioning hole 9 and a connecting hole are formed on the semicircular flange connection part 8. A positioning pin 11 is arranged in the positioning hole 9. The coaxial converter can be conveniently connected to peripheral equipment through the positioning pin 11 and the semicircular flange connection part 8, and the connecting hole is used to connect the converter to other devices.

[0025] The converter of the present application has a boss formed in the waveguide cavity for impedance matching, and is provided with a tuning screw with adjustable height. The above configuration can effectively adjust the impedance matching, optimize the spread spectrum performance, thereby expanding the working frequency band and increasing the working frequency; the waveguide cavity of the converter is provided with an inner surface with a certain slope above and below the transition section between the cavity and the standard output waveguide port, further optimizing the spread spectrum performance, thereby expanding the working frequency band and increasing the working frequency, so that the working frequency band range of the converter can reach 24-50GHz, which is very suitable for 5G millimeter wave related test applications.

[0026] In addition, the main mode cutoff frequency and low-frequency frequency of the rectangular waveguide are mainly affected by the size of the long side of the rectangular waveguide, that is, the a side. Therefore, the b side is reduced (the short side of the rectangular waveguide is the b side). The narrow b-side structure is achieved by setting inclined surfaces on the upper and lower surfaces of the cavity, which has little effect on the main mode cutoff frequency of the waveguide. At the same time, the narrow b-side structure can reduce the mouth size of the rectangular waveguide, change the aspect ratio of the rectangle, and increase the high-frequency cutoff frequency of the high-order mode to a certain extent, thereby achieving the purpose of expanding the bandwidth.

Claims

1. A millimeter wave spread spectrum waveguide coaxial converter, characterized in that: The converter comprises an upper cavity (1) and a lower cavity (2), wherein a waveguide cavity (3) is formed between the upper cavity (1) and the lower cavity (2), and a boss (4) is formed in the waveguide cavity (3); the converter further comprises a connector (5), wherein the connector (5) is fixed on the upper cavity (1), and a coaxial inner conductor (6) of the connector (5) is inserted into the waveguide cavity (3) formed between the upper cavity (1) and the lower cavity (2); the converter further comprises a tuning screw (7), wherein the tuning screw (7) is located outside the lower cavity (2), and the upper end of the tuning screw (7) passes through the lower cavity (2) and enters into the waveguide cavity (3), and the upper end of the tuning screw (7) is located between the boss (4) and the lower end of the coaxial inner conductor (6).

2. The millimeter-wave spread spectrum waveguide-to-coaxial converter according to claim 1, characterized in that: A nut (10) is provided at the outer end of the tuning screw (7).

3. The millimeter-wave spread spectrum waveguide-to-coaxial converter according to claim 1, characterized in that: The height of the boss (4) is smaller than the height of the upper end of the tuning screw (7).

4. The millimeter-wave spread spectrum waveguide-to-coaxial converter according to claim 1, characterized in that: There is a gap between the boss (4), the coaxial inner conductor (6) and the tuning screw (7).

5. The millimeter-wave spread spectrum waveguide-to-coaxial converter according to claim 1, characterized in that: One end of the waveguide cavity (3) is closed, and the other end has an opening, and the distance between the lower surface of the upper cavity (1) on the side of the waveguide cavity (3) close to the opening and the upper surface of the lower cavity (2) first remains constant, then gradually increases, and then remains constant until the opening of the waveguide cavity (3).

6. The millimeter wave spread spectrum waveguide coaxial converter according to claim 5, characterized in that: The lower surface of the upper cavity (1) is formed with a first horizontal plane starting from the inner end, a first inclined plane extending upward is connected to one side of the first horizontal plane, a second horizontal plane is connected to one side of the first inclined plane, and the second horizontal plane extends to the opening of the waveguide cavity (3); the upper surface of the lower cavity (2) is formed with a third horizontal plane starting from the inner end, a second inclined plane extending downward is connected to one side of the third horizontal plane, a fourth horizontal plane is connected to one side of the second inclined plane, and the fourth horizontal plane extends to the opening of the waveguide cavity (3).

7. The millimeter-wave spread spectrum waveguide-to-coaxial converter according to claim 1, characterized in that: A semicircular flange connection portion (8) is formed at the right end portions of the upper cavity (1) and the lower cavity (2), and a positioning hole (9) and a connection hole are formed on the semicircular flange connection portion (8).

8. The millimeter wave spread spectrum waveguide coaxial converter according to claim 7, characterized in that: A positioning pin (11) is arranged in the positioning hole (9).

9. The millimeter wave spread spectrum waveguide coaxial converter according to claim 1, characterized in that: The upper cavity (1) and the lower cavity (2) are fixedly connected together via screws and screw holes that cooperate with each other.

10. The millimeter wave spread spectrum waveguide coaxial converter according to claim 1, characterized in that: A connecting thread is formed on the outer circumference of the connector (5).

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