CN217361871U - Ka-Band Terminated Waveguide-to-Coaxial Converter - Google Patents

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-Band Terminated Waveguide-to-Coaxial Converter

technical field

The utility model relates to the technical field of waveguide coaxial conversion equipment, in particular to a Ka-band termination type waveguide coaxial converter.

Background technique

Ka-band waveguide-coaxial converter is a key transmission line transition structure widely used in various microwave and millimeter-wave systems, especially in active phased array antenna systems, often used for signal interconnection between waveguide array antennas and transceiver modules . With the development of phased array radar, higher requirements are put forward for the operating frequency, bandwidth, and size of the waveguide coaxial conversion. The performance of the existing Ka-band terminated waveguide-coaxial converters will deteriorate sharply due to machining accuracy errors and assembly errors. As shown in Figure 6, the return loss cannot achieve the full-band -20dB target.

Utility model content

The technical problem to be solved by the utility model is: in order to solve the technical problem of the performance deterioration caused by the assembly and processing errors of the traditional terminated waveguide-coaxial converter in the prior art. The utility model provides a Ka-band termination type waveguide coaxial converter, an adjustable waveguide cavity is designed, and a radio frequency insulator is used to replace the traditional metal long needle to connect the coaxial connector and the waveguide, so that the component installation becomes simple It is highly efficient and greatly improves the performance stability of the product, and the performance optimization can be completed only by perturbing the electromagnetic field in the waveguide with a general tuning screw. Greatly improves installation efficiency and reduces performance degradation due to assembly and machining errors.

The technical scheme adopted by the utility model to solve the technical problem is: a Ka-band termination type waveguide coaxial converter, comprising:

a waveguide, the waveguide has a cavity that penetrates through the front and rear, and the front part of the waveguide is provided with a connecting part;

a rear end cover of the waveguide, the rear end cover of the waveguide is fixed on the rear end surface of the waveguide, and the rear end cover of the waveguide is provided with an insulator installation hole corresponding to the cavity position of the waveguide;

a connector, the connector is fixed on the rear end of the waveguide rear end cover;

A radio frequency insulator, one end of the radio frequency insulator is installed in the insulator installation hole, and the other end of the radio frequency insulator is inserted into the connector.

Further, 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 gradually decreases from front to back.

Further, in order to be more suitable for broadband transmission, the stepped cavity has three steps, the first step is close to the rectangular cavity, the second step and the third step are in sequence backward, and the heights of the three steps increase sequentially from front to back. , the parameters of each step are obtained by 3D electromagnetic simulation.

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

Further, the insulator mounting hole includes a large diameter section and a small diameter section, the main body of the radio frequency insulator is inserted into the large diameter section, the long needle of the radio frequency insulator is coaxially arranged in the small hole, and the Short pins are inserted into the conductors.

Further, the upper end face of the waveguide is provided with a through hole, the through hole is connected to the cavity, and a tuning screw is inserted into the through hole, and the general tuning screw can disturb the electromagnetic field in the waveguide to complete the performance. Optimization.

Further, there are three through holes, the three through holes are arranged in sequence along the length direction of the waveguide, and tuning screws are arranged on all the three through holes.

Further, in order to facilitate the installation of the waveguide rear end cap and the waveguide, the waveguide rear end cap and the rear end surface of the waveguide are connected by pins.

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

The beneficial effect of the present invention is that the Ka-band terminated waveguide coaxial converter of the present invention adopts a three-step single-ridge waveguide structure simulated by a full-wave electromagnetic field. This structure and its optimized structural parameters ensure that the Perfect impedance matching between the coaxial end and the waveguide end in the band, so that the Ka-band terminated waveguide-coaxial converter based on the present utility model has outstanding broadband insertion and reflection loss performance; the present utility model uses a radio frequency insulator to replace The traditional metal long pin connects the coaxial connector and the waveguide, which makes the component installation easy and efficient and greatly improves the performance stability of the product. The utility model designs an adjustable waveguide cavity, and the performance optimization can be completed by using a general tuning screw, which greatly improves the installation efficiency, and compensates and reduces the performance deviation and deterioration caused by assembly and processing errors that cannot be completely avoided; The unique mechanical design of the utility model results in the refined size and unique shape of the entire product.

Description of drawings

The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the outline schematic diagram of the Ka-band terminated waveguide-coaxial converter of the present utility model;

Fig. 2 is the Ka-band termination waveguide-coaxial converter assembly drawing of the present utility model;

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

4 is a schematic diagram of the outline of the waveguide rear end cover of the present invention;

Fig. 5 is the outline schematic diagram of the waveguide radio frequency insulator of the present invention;

Fig. 6 is the VSWR and insertion loss test data graph of the prior art;

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

In the picture:

10, waveguide; 11, cavity; 111, rectangular cavity; 112, stepped cavity; 12, through hole; 13, tuning screw; 14, connecting part; 20, waveguide rear cover; 21, insulator mounting hole; 22, pin; 30, connector; 40, radio frequency insulator.

Detailed ways

The present utility model will now be described in further detail in conjunction with the accompanying drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the present invention in a schematic manner, so they only show the structures related to the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial" The orientation or positional relationship indicated by , "radial direction", "circumferential direction", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying the indicated device. Or the elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, features delimited with "first", "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As shown in FIG. 1 to FIG. 3 , a Ka-band terminated waveguide-to-coaxial converter includes: a waveguide 10 , a waveguide rear cover 20 , a connector 30 and a radio frequency insulator 40 , and the waveguide 10 has a cavity that runs through the front and rear. The front part of the waveguide 10 is provided with a connecting part 14; the rear end cover 20 of the waveguide is fixed on the rear end surface of the waveguide 10, and the rear end cover 20 of the waveguide is provided with an insulator mounting hole corresponding to the cavity 11 of the waveguide 10 21. The connector 30 is fixed on the rear end of the waveguide rear end cover 20, one end of the radio frequency insulator 40 is installed in the insulator mounting hole 21, and the other end of the radio frequency insulator 40 is inserted into the connector 30, and the waveguide rear end cover 20 is as shown in FIG. shown in Figure 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 gradually decreases from front to back, the stepped cavity 112 has three steps, and the one close to the rectangular cavity 111 is the first One step is followed by the second step and the third step backwards. The heights of the three steps increase sequentially from the front to the back. The parameters of each step are obtained by 3D electromagnetic simulation.

The connector 30 includes a threaded shell and a conductor disposed in the shell, the insulator mounting hole 21 includes a large diameter section and a small diameter section, the main body of the radio frequency insulator 40 is inserted into the large diameter section, and the long needle of the radio frequency insulator 40 is coaxially arranged in the small diameter section. Inside the hole, the short pins of the radio frequency insulator 40 are inserted into the conductor, and the radio frequency insulator 40 is shown in FIG. 5 .

The upper end surface of the waveguide 10 is provided with a through hole 12 , the through hole 12 communicates with the cavity 11 , the through hole 12 is inserted with a tuning screw 13 , there are three through holes 12 , and the three through holes 12 are along the length direction of the waveguide 10 . Arranged in sequence, the three through holes 12 are all provided with tuning screws 13 .

The rear end surface of the waveguide rear end cover 20 and the waveguide 10 are connected by a pin shaft 22, and the connecting portion 14 is a four-hole flange.

Example 1

The length of the rectangular cavity 111 is 13.76mm, the width is 7.12mm, and the height is 3.56mm, which matches the width and height of the rectangular slot of the standard WR-28 rectangular waveguide. The internal medium is air, and the connecting part 14 is a standard WR-28 four-hole flange.

The stepped cavity 112 has three steps. The length of the first step is 2.59mm, the width is 1.96mm, and the height is 0.28mm. The length of the second step is 2.21mm, the width is 1.96mm, and the height is 1.12mm; It 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 surface of the waveguide 10 is provided with a positioning pin hole, and the pin hole is a positioning pin hole with a diameter of 1mm. For installing positioning pins, it is used for the connection between the rear end cover 20 of the waveguide and the rear end surface of the waveguide 10. The rear end surface of the waveguide 10 is provided with a standard M2.5 threaded hole for threaded connection with the K-type connector 30;

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

The Ka-band termination type waveguide coaxial converter of the present application, the assembly process is as follows:

Step 1, apply the conductive adhesive to the surface of the body of the RF insulator 40, step 2, install the applied RF insulator 40 on the back end cover 20 of the waveguide, put it into a high temperature box to dry and fix it; step 3, insert one end of the standard positioning pin into Dry the waveguide rear end cover 20, and insert the other end of the pin into the pin hole on the waveguide 10; Step 4, install the K-type connector 30 on the other side of the waveguide rear end cover 20 without the pin hole, screw Install the standard screws to fix the K-type connector 30; Step 5, screw the three tuning screws 13 into the through holes 12 at the upper end of the waveguide cavity 11 respectively;

The assembly of the Ka-band-terminated waveguide coaxial converter is achieved through the above five assembly steps: the K-type connector 30 , the waveguide rear cover 20 , the RF insulator 40 and the waveguide 10 are fully matched.

It should be noted that in step 1, the radio frequency insulator 40 adopts the radio frequency insulator 40 commonly used in the market, and the conductive adhesive is evenly applied to the surface of the thick end cylinder of the body of the radio frequency insulator 40, and the coating range is to reach 2/3 of the length of the thick end cylinder. displacement.

In step 2, the rear end cover 20 of the waveguide is provided with an insulator mounting hole 21 matching the RF insulator 40, and the coated RF insulator 40 is slowly put into the insulator mounting hole 21, and the center of the insulator is carefully moved so that the center of the insulator is concentric with the center of the mounting hole , and then put it into a high temperature oven of 120 ° C for 20 minutes to make the insulator firmly fixed on the cover plate.

In step 3, insert one end of two positioning pins with a standard diameter of 1 mm into the pin holes of the dried waveguide rear end cover 20 respectively, and insert the other ends of the pins into the corresponding positioning pin holes on the waveguide cavity 11 respectively, The radio frequency insulator 40, the waveguide cover plate and the waveguide cavity 11 have high assembly precision.

In step 4, insert the exposed thin-end RF probe on the waveguide rear cover 20 into the center of the inner conductor of the K-type connector 30, use 2 standard M2.5 screws, and screw them into the rear cover in sequence with a diameter of 2.6 The mm through hole 12 and the M2.5 standard tightening threaded hole on the waveguide cavity 11 make the K-type connector 30, the waveguide rear end cover 20 and the waveguide cavity 11 connected as a whole.

In step 5, screw three standard M1.6 tuning screws 13 into the tuning threaded holes at the top of the waveguide cavity 11, and optimize the best performance by controlling the screwing depth of the screws.

The test results of this embodiment 1 are shown in Figure 7. The return loss is greater than 20dB in the full frequency range of 26.5-40GHz, and the product performance is far superior to similar products.

The Ka-band end-connected waveguide coaxial converter of the present invention adopts a three-step single-ridge waveguide structure simulated by a full-wave electromagnetic field. This structure and its optimized structural parameters ensure the coaxial end and the waveguide in the full Ka-band. Therefore, the Ka-band terminated waveguide-coaxial converter based on the present invention has excellent broadband insertion and reflection loss performance; the present invention uses the radio frequency insulator 40 to replace the traditional metal long pin to connect the same Shaft joints and waveguides make component installation simple and efficient and greatly improve product performance stability. The utility model designs an adjustable waveguide cavity 11, and the performance optimization can be completed by using a general tuning screw 13, which greatly improves the installation efficiency, and compensates and reduces the performance deviation caused by assembly and processing errors that are difficult to completely avoid. Deterioration; the unique mechanical design of the utility model results in the refined size and unique shape of the entire product.

To sum up, the Ka-band termination type waveguide coaxial converter of the present invention is simple in product installation, and the performance stability, consistency and reliability of the product are effectively improved. Taking the above ideal embodiment according to the present invention as inspiration, through the above description, relevant staff can make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present utility model is not limited to the contents in the description, and the technical scope must be determined according to the scope of the claims.

Claims (9)

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.

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