CN217361871U

CN217361871U - Ka wave band terminating type waveguide coaxial converter

Info

Publication number: CN217361871U
Application number: CN202220940360.XU
Authority: CN
Inventors: 肖可成; 陈野驰; 吴凯; 陆凌涛
Original assignee: Jiangsu Trigiant Technology Co ltd
Current assignee: Jiangsu Trigiant Technology Co ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-09-02
Anticipated expiration: 2032-04-22

Abstract

The utility model relates to a coaxial converting equipment technical field of waveguide especially relates to a coaxial converter of Ka wave band termination type waveguide, include: the waveguide tube is provided with a cavity which is penetrated through from front to back, and the front part of the waveguide tube is provided with a connecting part; the waveguide rear end cover is fixedly arranged on the rear end surface of the waveguide tube, and an insulator mounting hole is formed in the waveguide rear end cover corresponding to the cavity of the waveguide tube; the connector is fixedly arranged at the rear end of the waveguide rear end cover; and one end of the radio frequency insulator is arranged in the insulator mounting hole, and the other end of the radio frequency insulator is inserted in the connector. The utility model discloses a coaxial converter of Ka wave band termination type waveguide, the installation is simple easily produces the line workman and operates to can make product property ability stability, uniformity and reliability obtain improving.

Description

Ka wave band terminating type waveguide coaxial converter

Technical Field

The utility model relates to a coaxial converting means technical field of waveguide especially relates to a coaxial converter of Ka wave band termination type waveguide.

Background

The Ka-band waveguide-coaxial converter is a key transmission line transition structure widely used in various microwave and millimeter wave systems, and is particularly used for signal interconnection between a waveguide array antenna and a transceiver module in an active phased array antenna system. With the development of phased array radar, higher requirements are put forward on the working frequency, bandwidth, size and the like of waveguide coaxial conversion. The performance of the existing Ka-band terminating waveguide-coaxial converter is rapidly deteriorated due to processing precision errors and assembly errors, and the return loss can not achieve the index of full band-20 dB as shown in figure 6.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the technical problem that the performance of a traditional terminating waveguide-coaxial converter is deteriorated due to assembly and machining errors in the prior art is solved. The utility model provides a coaxial converter of Ka wave band termination type waveguide has designed the waveguide cavity of adjustable to and replace traditional metal long needle connection coaxial joint and waveguide through radio frequency insulator, make the part installation become simply high-efficient and improve product property ability stability greatly, and only need use general tuning screw to carry out the optimization that the performance can be accomplished in the electromagnetic field disturbance in the waveguide. The mounting efficiency is greatly improved, and the performance deterioration caused by assembly and machining errors is reduced.

The utility model provides a technical scheme that its technical problem adopted is: a Ka-band terminated waveguide coaxial converter comprising:

the waveguide tube is provided with a cavity which is penetrated through from front to back, and the front part of the waveguide tube is provided with a connecting part;

the waveguide rear end cover is fixedly arranged on the rear end face of the waveguide tube, and insulator mounting holes are formed in the waveguide rear end cover corresponding to the cavity of the waveguide tube;

the connector is fixedly arranged at the rear end of the waveguide rear end cover;

and one end of the radio frequency insulator is arranged in the insulator mounting hole, and the other end of the radio frequency insulator is inserted in the connector.

Furthermore, the front end of the cavity is a rectangular cavity, the rear end of the cavity is a stepped cavity, and the longitudinal section of the stepped cavity is gradually reduced from front to back.

Furthermore, in order to be more suitable for broadband transmission, the stepped cavity is provided with three steps, a first step is arranged close to the rectangular cavity, a second step and a third step are sequentially arranged backwards, the heights of the three steps are sequentially increased from the front to the back, and each step parameter is obtained through three-dimensional electromagnetic simulation.

Further, the connector includes a threaded housing and a conductor disposed within the housing.

Further, the insulator mounting hole comprises a large-diameter section and a small-diameter section, the main body of the radio-frequency insulator is connected in the large-diameter section in an inserting mode, the long needle of the radio-frequency insulator is coaxially arranged in the small hole, and the short needle of the radio-frequency insulator is connected in the conductor in an inserting mode.

Furthermore, a through hole is formed in the upper end face of the waveguide tube and communicated with the cavity, a tuning screw is inserted into the through hole, and the performance can be optimized by disturbing the electromagnetic field in the waveguide by the universal tuning screw.

Furthermore, the through holes are three and are sequentially arranged along the length direction of the waveguide tube, and tuning screws are arranged on the three through holes.

Further, in order to facilitate installation of the waveguide rear end cover and the waveguide tube, the waveguide rear end cover is connected with the rear end face of the waveguide tube through a pin shaft.

Further, the connecting part is a four-hole flange.

The beneficial effects of the utility model are that, the utility model discloses a Ka wave band termination type waveguide coaxial converter adopts the three-step single-ridge waveguide structure of full wave electromagnetic field emulation, and this structure and its optimization structure parameter guarantee the perfect impedance match of coaxial end and waveguide end in the full Ka wave band, thereby make based on the Ka wave band termination type waveguide-coaxial converter of the utility model has outstanding broadband insertion and reflection loss performance; the utility model discloses used radio frequency insulator to replace traditional metal long needle to connect coaxial joint and waveguide for the part installation becomes simple high-efficient and improve product property ability stability greatly. The utility model designs an adjustable waveguide cavity, can complete the performance optimization by using a universal tuning screw, greatly improves the installation efficiency, compensates and reduces the performance deviation and deterioration caused by the assembly and processing errors which are difficult to completely avoid; the utility model discloses unique mechanical design, the exquisite size and the unique appearance of the whole product that obtains.

Drawings

The present invention will be further described with reference to the accompanying drawings and examples.

Fig. 1 is a schematic view of the Ka band termination waveguide-coaxial converter of the present invention;

fig. 2 is an assembly view of the Ka band termination waveguide-coaxial converter of the present invention;

fig. 3 is a cross-sectional view and a rear view of the waveguide cavity of the present invention;

fig. 4 is a schematic view of the waveguide rear end cap according to the present invention;

fig. 5 is a schematic external view of the waveguide radio frequency insulator of the present invention;

FIG. 6 is a prior art VSWR and insertion loss test data plot;

fig. 7 is a VSWR and insertion loss test data graph of an embodiment of the invention.

In the figure:

10. a waveguide; 11. a cavity; 111. a rectangular cavity; 112. a stepped cavity; 12. a through hole; 13. a tuning screw; 14. a connecting portion; 20. a waveguide rear end cap; 21. an insulator mounting hole; 22. a pin shaft; 30. a connector; 40. a radio frequency insulator.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 3, a Ka band termination type waveguide coaxial converter includes: the waveguide comprises a waveguide tube 10, a waveguide rear end cover 20, a connector 30 and a radio frequency insulator 40, wherein the waveguide tube 10 is provided with a cavity 11 which penetrates through the front and the back, and the front part of the waveguide tube 10 is provided with a connecting part 14; the waveguide rear end cap 20 is fixedly arranged on the rear end face of the waveguide tube 10, the waveguide rear end cap 20 is provided with an insulator mounting hole 21 corresponding to the cavity 11 of the waveguide tube 10, the connector 30 is fixedly arranged at the rear end of the waveguide rear end cap 20, one end of the radio frequency insulator 40 is arranged in the insulator mounting hole 21, the other end of the radio frequency insulator 40 is inserted in the connector 30, and the waveguide rear end cap 20 is shown in fig. 4.

The front end of the cavity 11 is a rectangular cavity 111, the rear end of the cavity 11 is a stepped cavity 112, the longitudinal section of the stepped cavity 112 is gradually reduced from front to back, the stepped cavity 112 is provided with three steps, a first step is arranged close to the rectangular cavity 111, a second step and a third step are sequentially arranged backwards, the heights of the three steps are sequentially increased from front to back, and each step parameter is obtained by three-dimensional electromagnetic simulation.

The connector 30 comprises a threaded shell and a conductor arranged in the shell, the insulator mounting hole 21 comprises a large-diameter section and a small-diameter section, a main body of the radio-frequency insulator 40 is connected in the large-diameter section in an inserting mode, a long needle of the radio-frequency insulator 40 is coaxially arranged in the small hole, a short needle of the radio-frequency insulator 40 is connected in the conductor in an inserting mode, and the radio-frequency insulator 40 is shown in fig. 5.

The upper end face of the waveguide tube 10 is provided with three through holes 12, the through holes 12 are communicated with the cavity 11, the through holes 12 are inserted with tuning screws 13, the number of the through holes 12 is three, the three through holes 12 are sequentially arranged along the length direction of the waveguide tube 10, and the tuning screws 13 are arranged on the three through holes 12.

The waveguide rear end cover 20 is connected with the rear end face of the waveguide 10 through a pin 22, and the connecting part 14 is a four-hole flange.

Example 1

The rectangular cavity 111 has a length of 13.76mm, a width of 7.12mm, a height of 3.56mm, a width and a height of a rectangular slot matching a standard WR-28 rectangular waveguide, an internal medium of air, a connection part 14 of a standard WR-28 four-hole flange,

the step cavity 112 has three steps, a first step with a length of 2.59mm, a width of 1.96mm and a height of 0.28mm, a second step with a length of 2.21mm, a width of 1.96mm and a height of 1.12 mm; the length of the second-stage step is 1.5mm, the width is 1.96mm, the height is 2.24mm, the three through holes 12 are standard M1.6 threaded holes, the rear end face of the waveguide tube 10 is provided with a positioning pin hole, the pin hole is a positioning pin hole with the diameter of 1mm and used for installing a positioning pin and connecting the rear end cover 20 of the waveguide tube 10 with the rear end face of the waveguide tube 10, and the rear end face of the waveguide tube 10 is provided with a standard M2.5 threaded hole used for being in threaded connection with the K-type connector 30;

the waveguide rear end cover 20 is 15.88mm in length, 7.62mm in width, 2.54mm in thickness, and is provided with a through hole 12 with the diameter of 2.6mm on the end face for mounting the K-type connector 30.

The Ka waveband termination type waveguide coaxial converter has the following assembling process:

coating conductive adhesive on the surface of a body of the radio frequency insulator 40, and installing the coated radio frequency insulator 40 on the waveguide rear end cover 20, and placing the waveguide rear end cover in a high-temperature box for drying and fixing; inserting one end of a standard positioning pin into the dried waveguide rear end cover 20, and inserting the other end of the pin into a pin hole on the waveguide 10; fourthly, mounting the K-shaped connector 30 on the other side of the waveguide rear end cover 20 without the pin hole, screwing a standard screw and fixing the K-shaped connector 30; step five, screwing 3 tuning screws 13 into through holes 12 at the upper end of the waveguide cavity 11 respectively;

the assembly of the Ka-band terminated waveguide coaxial converter is realized through the above 5 assembly steps: the K-type connector 30, the waveguide rear end cover 20 and the radio frequency insulator 40 are completely matched with the waveguide 10.

It should be noted that, in the step one, the radio frequency insulator 40 is a commercially available radio frequency insulator 40, and the conductive adhesive is uniformly applied to the surface of the thick-end cylinder of the body of the radio frequency insulator 40, where the application range reaches 2/3 displacement of the thick-end cylinder.

In the second step, the waveguide rear end cover 20 is provided with an insulator mounting hole 21 matched with the radio frequency insulator 40, the painted radio frequency insulator 40 is slowly placed into the insulator mounting hole 21, the insulator is carefully moved to enable the center of the insulator to be concentric with the center of the mounting hole, and then the insulator is placed into a high-temperature box at 120 ℃ to be dried for 20 minutes, so that the insulator is firmly fixed on the cover plate.

In the third step, one end of each of 2 positioning pins with standard diameter of 1mm is respectively inserted into the pin holes 20 of the dried waveguide rear end cover, and the other end of each positioning pin is respectively inserted into the corresponding positioning pin holes on the waveguide cavity 11, so that the radio frequency insulator 40, the waveguide cover plate and the waveguide cavity 11 have high assembly precision.

In the fourth step, the thin-end radio-frequency probe exposed outside on the waveguide rear end cover 20 is inserted into the center of the conductor in the K-

type connector

30, and 2 standard M2.5 screws are used to be sequentially screwed into the through hole 12 with the diameter of 2.6mm of the rear end cover plate and the M2.5 standard fastening threaded hole on the waveguide cavity 11, so that the K-type connector 30, the waveguide rear end cover 20 and the waveguide cavity 11 are connected into a whole.

In step five, 3 standard M1.6 tuning screws 13 are screwed into tuning threaded holes on the top of the waveguide cavity 11, and the optimum performance is optimized by controlling the screw screwing depth.

The test result of this example 1 is shown in fig. 7, the return loss is greater than 20dB in the full band of 26.5-40GHz, and the product performance is excellent and far superior to that of the same kind of products.

The utility model discloses a Ka wave band termination type waveguide coaxial converter has adopted the three-step type single ridge waveguide structure of full wave electromagnetic field emulation, and this structure and its optimization structure parameter guarantee the perfect impedance match of coaxial end and waveguide end in full Ka wave band, thereby make based on the utility model discloses a Ka wave band termination type waveguide-coaxial converter has outstanding broadband insertion and reflection loss performance; the utility model discloses used radio frequency insulator 40 to replace traditional metal long needle to connect coaxial joint and waveguide for the part installation becomes simple high-efficient and improve product property ability stability greatly. The utility model designs an adjustable waveguide cavity 11, and can complete the performance optimization by using a universal tuning screw 13, thereby greatly improving the installation efficiency, compensating and reducing the performance deviation and deterioration caused by assembly and processing errors which are difficult to completely avoid; the utility model discloses unique mechanical design, the exquisite size and the unique appearance of the whole product that obtains.

To sum up, the utility model discloses a coaxial converter of Ka wave band termination type waveguide, the product installation is simple, and product property can stability, uniformity, reliability effectively be improved. In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined by the scope of the claims.

Claims

1. A Ka-band terminated waveguide coaxial converter, comprising:

the waveguide tube (10), the said waveguide tube (10) has cavity (11) that link up from front to back, the front portion of the said waveguide tube (10) has interconnecting pieces (14);

the waveguide rear end cover (20), the waveguide rear end cover (20) is fixedly arranged on the rear end face of the waveguide tube (10), and insulator mounting holes (21) are formed in the waveguide rear end cover (20) corresponding to the cavity (11) of the waveguide tube (10);

a connector (30), wherein the connector (30) is fixedly arranged at the rear end of the waveguide rear end cover (20);

one end of the radio frequency insulator (40) is installed in the insulator installation hole (21), and the other end of the radio frequency insulator (40) is inserted into the connector (30).

2. The Ka-band termination type waveguide coaxial converter according to claim 1, wherein the front end of the cavity (11) is a rectangular cavity (111), the rear end of the cavity (11) is a stepped cavity (112), and a longitudinal section of the stepped cavity (112) is gradually reduced from front to rear.

3. The Ka-band terminated waveguide coaxial converter according to claim 2, wherein the stepped cavity (112) has three steps, a first step is arranged near the rectangular cavity (111), a second step and a third step are arranged behind the rectangular cavity, the heights of the three steps are increased from front to back, and each step parameter is obtained by three-dimensional electromagnetic simulation.

4. The Ka band termination waveguide coaxial converter of claim 1, wherein the connector (30) comprises a threaded outer shell and a conductor disposed within the outer shell.

5. The Ka band termination waveguide coaxial converter according to claim 4, wherein the insulator mounting hole (21) comprises a large diameter section and a small diameter section, the body of the radio frequency insulator (40) is inserted into the large diameter section, the long pin of the radio frequency insulator (40) is coaxially arranged in the small hole, and the short pin of the radio frequency insulator (40) is inserted into the conductor.

6. The Ka-band termination type waveguide coaxial converter according to claim 1, wherein a through hole (12) is formed in an upper end surface of the waveguide (10), the through hole (12) is communicated with the cavity (11), and a tuning screw (13) is inserted into the through hole (12).

7. The Ka band termination type waveguide coaxial converter according to claim 6, wherein the number of the through holes (12) is three, three through holes (12) are sequentially arranged along the length direction of the waveguide tube (10), and tuning screws (13) are provided on all three through holes (12).

8. The Ka band termination type waveguide coaxial converter according to claim 1, wherein the waveguide rear end cap (20) and the rear end face of the waveguide (10) are connected by a pin (22).

9. The Ka band termination waveguide coaxial converter of claim 1, wherein the connection is a four-hole flange.