CN112234327A - Waveguide microwave switch - Google Patents

Abstract

The invention provides a waveguide microwave switch, comprising: a radio frequency device and a protective film; wherein, a limiting structure for limiting the protective film in the channel direction is provided at a position associated with a waveguide channel of the radio frequency device; The protective film is fixedly connected with the limiting structure to seal the waveguide channel. The invention can effectively eliminate the window resonance, expand the operating frequency of the waveguide switch, and has a simple structure and easy processing.

Description

A waveguide microwave switch

technical field

The invention relates to the technical field of microwave products, in particular to a waveguide microwave switch.

Background technique

As an indispensable part of satellite payloads, microwave switches appear in almost all types of satellite payloads such as communication, navigation, data transmission, measurement and control, and the number is large.

At present, the mechanical waveguide microwave switch produced by the manufacturer is composed of a radio frequency device, a driving device and a control circuit. The control circuit sends a control signal to the driving device, and the driving device drives the radio frequency shaft to move in a circular direction, and the corresponding radio frequency channel is turned on. Among them, the radio frequency device of the mechanical waveguide microwave switch undertakes the task of transmitting radio frequency signals and is an important part of the microwave switch. The radio frequency device is composed of a rotating shaft and a base. The waveguide port of the radio frequency device is an important external interface of the microwave switch. In order to avoid the risk of switching failure of the switch and the risk of radio frequency channel discharge, the traditional mechanical waveguide switch is designed with a dust-proof window at the waveguide port.

In the prior art solution, a waveguide port pressing sheet is usually added to the waveguide port of the radio frequency device, and the waveguide port pressing sheet is covered by a protective film to seal the waveguide port, which may cause in-band clutter. , which in turn leads to the degradation of the in-band standing wave and insertion loss performance, and reduces the working bandwidth of the microwave switch.

SUMMARY OF THE INVENTION

The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a waveguide microwave switch.

In order to solve the above technical problem, an embodiment of the present invention provides a waveguide microwave switch, the waveguide microwave switch includes: a radio frequency device and a protective film; wherein,

A limiting structure for limiting the protective film in the channel direction is provided at a position associated with the waveguide channel of the radio frequency device;

The protective film is fixedly connected with the limiting structure to seal the waveguide channel.

Optionally, the waveguide microwave switch further includes: a control circuit and a driving device,

Wherein, one end of the driving device is connected to the control circuit, and the other end of the driving device is connected to the radio frequency device;

the control circuit configured to generate a control signal and send the control signal to the driving device;

The driving device is configured to receive the control signal and drive the radio frequency device to rotate in the circumferential direction according to the control signal;

The radio frequency device is configured to transmit radio frequency signals during rotation.

Optionally, the radio frequency device includes a rotating shaft and a base, wherein,

One end of the rotating shaft is connected with the driving device;

The base is arranged on the other end of the rotating shaft and is fixedly connected with the rotating shaft to support the rotating shaft.

Optionally, the limiting structure is a stepped limiting structure.

Optionally, the waveguide channel includes a first waveguide port close to the outer side,

A step-shaped limiting structure with an empty center is disposed in the waveguide channel at a position at a first preset distance from the first waveguide port.

Optionally, the waveguide channel includes a second waveguide port close to the inner side,

A stepped limiting structure with an empty center is provided at a position within the waveguide channel at a second preset distance from the second waveguide port.

Optionally, the limiting structure is a groove-shaped limiting structure.

Optionally, the waveguide channel includes a first waveguide port close to the outer side,

Two of the groove-shaped limiting structures are arranged in the waveguide channel at a third preset distance from the first waveguide port;

Wherein, the connecting planes of the two groove-shaped limiting structures are parallel to the transverse section of the waveguide channel.

Optionally, the waveguide channel includes a second waveguide port close to the inner side,

Two of the groove-shaped limiting structures are arranged in the waveguide channel at a fourth preset distance from the second waveguide port;

Wherein, the connecting planes of the two groove-shaped limiting structures are parallel to the transverse section of the waveguide channel.

Optionally, the protective film is a film made of polyimide.

Optionally, the protective film and the limiting structure are fixedly connected by a sealant.

The advantages of the present invention compared with the prior art are:

In the embodiment of the present invention, a limit structure is provided at the position associated with the wave channel to realize the limit of the protective film, and the traditional wave guide port pressing sheet is abandoned. This protective film fixing method can effectively eliminate the dust-proof window caused by The in-band clutter improves the in-band standing wave and insertion loss performance and expands the operating bandwidth of the switch.

Description of drawings

FIG. 1 is a schematic structural diagram of a waveguide microwave switch according to an embodiment of the present invention;

2 is a schematic structural diagram of a dust-proof device according to an embodiment of the present invention;

3 is a schematic structural diagram of another dustproof device provided by an embodiment of the present invention;

4 is a schematic structural diagram of another dustproof device provided by an embodiment of the present invention;

5 is a schematic diagram of a straight channel standing wave measured curve according to an embodiment of the present invention;

6 is a schematic diagram of a straight channel insertion loss measured curve according to an embodiment of the present invention;

7 is a schematic diagram of a curved channel standing wave measured curve according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of an actual measurement curve of insertion loss of a curved channel according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1 , a schematic structural diagram of a waveguide microwave switch provided by an embodiment of the present invention is shown. As shown in FIG. 1 , the waveguide microwave switch may include a radio frequency device 10 and a protective film 4 .

Wherein, a limiting structure 3 for limiting the protective film in the channel direction is provided at the position associated with the waveguide channel of the radio frequency device, and the protective film 4 can be fixedly connected with the limiting structure 3 to seal the waveguide channel.

In a specific implementation, the protective film 4 and the limiting structure 3 may be fixedly connected by a sealant, so as to realize the sealing of the waveguide channel.

In the embodiment of the present invention, the limiting structure is arranged at the position associated with the waveguide channel, and the waveguide channel is sealed by a protective film. Compared with the traditional dust-proof window setting method, the waveguide port pressing sheet is abandoned, and a new protective film is adopted. As for the fixing method, it is obtained through experiments that the protective film fixing method provided by the present invention eliminates the in-band clutter caused by the traditional dustproof window, improves the in-band standing wave and insertion loss performance, and expands the working bandwidth of the switch.

In a specific implementation manner of the present invention, the waveguide microwave switch may further include: a control circuit 1 and a driving device 2, wherein,

The control circuit 1 may be configured to generate a control signal and send the control signal to the driving device in the case of entering an operating state.

The driving device 2 can be configured to receive the control signal sent by the control circuit 1, and drive the magic device to rotate in the circumferential direction according to the control signal.

The radio frequency device may be configured to transmit radio frequency signals during rotation. The control circuit and the driving device are both existing structures, and details are not described herein again in the embodiment of the present invention.

In another specific implementation of the present invention, the radio frequency device may further include a rotating shaft and a base (not shown in the figure), wherein one end of the rotating shaft is connected to the driving device, and during the rotation of the driving device, the rotating shaft can be driven to move Rotate in the circumferential direction. The base is arranged on the other end of the rotating shaft and is fixedly connected with the rotating shaft to support the rotating shaft, the driving device and the control circuit.

In this embodiment, the set limiting structure may be a stepped limiting structure, and specifically, it may be described in detail with reference to the following specific implementation manner.

In a specific implementation of the present invention, as shown in FIG. 1 and FIG. 4 , the limiting structure may be a stepped limiting structure, such as the stepped limiting structure 3 in FIG. 1 and the stepped limiting structure in FIG. 4 . Limiting structure 7.

The waveguide channel may include a first waveguide port near the outer side and a second waveguide port near the inner side.

When the limiting structure is a stepped limiting structure, a stepped limiting structure with an empty center may be set at a position within the waveguide channel at a first preset distance from the first waveguide port, as shown in FIG. 1 , A stepped limit structure 3 can be provided at the outer interface of the waveguide channel, and the protective film 4 can be limited. When the protective film 4 and the limit structure 3 are fixedly connected, the edge of the protective film 4 can be coated sealant, and move the side coated with the sealant toward the limiting structure 3 , so as to realize the fixing of the protective film 4 and the limiting structure 3 .

A stepped limit structure with an empty center can also be set at the position of the waveguide channel at the second preset distance from the second waveguide port. As shown in FIG. 4 , a stepped limit structure can be set at the inner diameter interface of the waveguide channel. The position structure 7 is used to realize the position limit of the protective film 4 . When the protective film 4 and the limiting structure 7 are fixedly connected, the edge of the protective film 4 can be coated with sealant, and the side coated with the sealant can be moved to the limiting structure 7, so as to realize the protective film 4 and the limiting structure. Fixed connection of structure 7.

In this embodiment, the set limiting structure may be a groove-shaped limiting structure, and specifically, it may be described in detail with reference to the following specific implementation manners.

In another specific implementation of the present invention, as shown in FIG. 2 and FIG. 3 , the limiting structure may be a groove-shaped limiting structure, such as the groove-shaped limiting structure 5 in FIG. 2 and FIG. 3 . The groove-shaped limiting structure 6.

When the limiting structure is a groove-shaped limiting structure, two groove-shaped limiting structures may be provided in the waveguide channel at a third preset distance from the first waveguide port, wherein the two grooves The connection plane of the shaped limiting structure is parallel to the cross section of the waveguide channel. As shown in Figure 2, two groove-shaped limiting structures 5 can be arranged at the outer interface of the waveguide channel, that is, at the opposite position of the waveguide channel. Two grooves are provided to limit the protective film 4. When the protective film 4 and the limiting structure 5 are fixedly connected, a sealant can be applied to the edge of the protective film 4, and the side where the sealant is applied When moving to the limiting structure 5 , when the protective film 4 is moved into the groove-shaped limiting structure 5 , the fixing of the protective film 4 and the limiting structure 3 can be realized by the sealant.

It is also possible to set two groove-shaped limiting structures at the position of the fourth preset distance from the second waveguide port in the waveguide channel. As shown in FIG. 3 , two grooves can be set at the inner diameter interface of the waveguide channel. 6 (two grooves arranged at opposite positions of the wave channel as shown in FIG. 3 ), wherein the connecting planes of the two groove-shaped limiting structures are parallel to the cross section of the waveguide channel, so as to The limit of the protective film 4 is realized. When fixing the protective film 4 and the limiting structure 6, sealant can be applied to the edge of the protective film 4, and the side coated with the sealant can be moved to the limiting structure 6, and the protective film 4 can be moved to the concave When inside the groove-shaped limiting structure 6 , the protective film 4 and the limiting structure 6 can be fixedly connected by a sealant.

It can be understood that the values of the first preset distance, the second preset distance, the third preset distance and the fourth preset distance mentioned in the above solution may be the same or different. Specifically, It may be determined according to service requirements, which is not limited in this embodiment.

It should be understood that the two types of limiting structures mentioned in the embodiments of the present invention are provided with an inner interface or an outer interface to achieve a limiting effect on the protective film, and on this basis, the first preset distance The values of , the second preset distance, the third preset distance and the fourth preset distance should be less than half of the length of the waveguide channel.

In this embodiment, the protective film may be a film made of polyimide. Of course, in a specific implementation, the protective film may also be made of other materials. Specifically, it may be determined according to business requirements. In this embodiment, This is not restricted.

The technical effect of using the protective film fixing method provided by the embodiment of the present invention is described below in combination with experiments.

It has been proved by experiments that using the waveguide microwave switch mentioned in the prior art solution, whether it is a straight channel or a curved channel, the insertion loss in the operating frequency range of 37-39Hz is significantly reduced, and the actual measurement is about 2-3dB. This phenomenon is in The transmission performance of the straight channel and the curved channel exists simultaneously, which is caused by the clutter excited at the dustproof window.

Using the structure of the present invention, a BJ400 waveguide switch is designed, and the specific dimensions of the stepped surface of the waveguide port are as follows: the broad side of the waveguide=6.8mm, and the narrow side of the waveguide=3.3mm. The test results can be shown in Figure 5 to Figure 8:

Referring to FIG. 5 , a schematic diagram of an actual measurement curve of a straight channel standing wave provided by an embodiment of the present invention is shown. As shown in FIG. 5 , when a stepped limit structure is used, the curve is continuous in the frequency band of 37-42.5 GHz , the maximum value of the standing wave is 1.34, and there is no abnormal curve caused by resonance.

Referring to FIG. 6 , a schematic diagram of a straight channel insertion loss measured curve provided by an embodiment of the present invention is shown. As shown in FIG. 6 , when a stepped limit structure is adopted, the curve is continuous in the frequency band of 37-42.5 GHz. , the maximum insertion loss is -0.28dB, the insertion loss fluctuates 0.15dB, and there is no abnormal curve caused by resonance.

Referring to FIG. 7 , a schematic diagram of an actual measurement curve of a standing wave in a curved channel provided by an embodiment of the present invention is shown. As shown in FIG. 7 , when a groove-shaped limiting structure is used, the curve in the frequency band of 37-42.5 GHz is Continuous, the maximum value of the standing wave is 1.13, and there is no abnormal curve caused by resonance.

Referring to FIG. 8 , a schematic diagram of a curved channel query actual curve provided by an embodiment of the present invention is shown. As shown in FIG. 8 , when a groove-shaped limit structure is used, the curve is continuous in the frequency band of 37-42.5 GHz , the maximum insertion loss is -0.22dB, the insertion loss fluctuation is 0.14dB, and there is no abnormal curve caused by resonance.

To sum up, after using the waveguide microwave switch provided by the embodiment of the present invention, the resonant frequency in the operating frequency band of the switch completely disappears; while using the traditional dust-proof window method, there is resonance near 37.8GHz, the insertion loss is -2.3dB, and the standing wave is the largest The value of 1.63 (-12.352dB), the in-band resonance seriously affects the in-band transmission characteristics. The improvement effect of the waveguide microwave switch in the embodiment of the present invention is obvious, and the operating frequency of the waveguide switch can be realized at 37-42.5 GHz. .

In the waveguide microwave switch provided by the embodiment of the present invention, the limiting structure is provided at the position associated with the wave channel, so as to realize the limiting of the protective film, and the traditional waveguide port pressing sheet is abandoned. This protective film fixing method can It can effectively eliminate the in-band clutter caused by the dust-proof window, improve the in-band standing wave and insertion loss performance, and expand the working bandwidth of the switch.

The embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of this application, without departing from the spirit of the present invention and the scope protected by the claims, many forms can be made, which all fall within the protection of the present invention.

The content not described in detail in the specification of the present invention belongs to the well-known technology of those skilled in the art.

Claims (11)

1. A waveguide microwave switch, wherein the waveguide microwave switch comprises: a radio frequency device and a protective film; wherein, A limiting structure for limiting the protective film in the channel direction is provided at a position associated with the waveguide channel of the radio frequency device; The protective film is fixedly connected with the limiting structure to seal the waveguide channel. 2 . The waveguide microwave switch according to claim 1 , wherein the waveguide microwave switch further comprises: a control circuit and a driving device, 3 . Wherein, one end of the driving device is connected to the control circuit, and the other end of the driving device is connected to the radio frequency device; The control circuit is configured to generate a control signal and send the control signal to the driving device when entering a working state; The driving device is configured to receive the control signal and drive the radio frequency device to rotate in the circumferential direction according to the control signal; The radio frequency device is configured to transmit radio frequency signals during rotation. 3. The waveguide microwave switch according to claim 2, wherein the radio frequency device comprises a rotating shaft and a base, wherein, One end of the rotating shaft is connected with the driving device; The base is arranged on the other end of the rotating shaft and is fixedly connected with the rotating shaft to support the rotating shaft. 4 . The waveguide microwave switch according to claim 1 , wherein the limiting structure is a stepped limiting structure. 5 . 5 . The waveguide microwave switch according to claim 4 , wherein the waveguide channel comprises a first waveguide port close to the outside, A step-shaped limiting structure with an empty center is disposed in the waveguide channel at a position at a first preset distance from the first waveguide port. 6 . The waveguide microwave switch according to claim 4 , wherein the waveguide channel comprises a second waveguide port close to the inner side, A step-shaped limiting structure with an empty center is disposed in the waveguide channel at a position at a second preset distance from the second waveguide port. 7 . The waveguide microwave switch according to claim 1 , wherein the limiting structure is a groove-shaped limiting structure. 8 . 8 . The waveguide microwave switch according to claim 7 , wherein the waveguide channel comprises a first waveguide port close to the outside, Two of the groove-shaped limiting structures are arranged in the waveguide channel at a third preset distance from the first waveguide port; Wherein, the connecting planes of the two groove-shaped limiting structures are parallel to the transverse section of the waveguide channel. 9 . The waveguide microwave switch according to claim 7 , wherein the waveguide channel comprises a second waveguide port close to the inner side, Two of the groove-shaped limiting structures are arranged in the waveguide channel at a fourth preset distance from the second waveguide port; Wherein, the connecting planes of the two groove-shaped limiting structures are parallel to the transverse section of the waveguide channel. 10 . The waveguide microwave switch according to claim 1 , wherein the protective film is a film made of polyimide. 11 . 11 . The waveguide microwave switch according to claim 1 , wherein the protective film and the limiting structure are fixedly connected by a sealant. 12 .

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