A multi-channel rotary joint with a profiled rotary absorption ring

Abstract

The application discloses a multi-channel rotary joint with special-shaped rotary absorption rings, wherein a through inner hole is arranged at the center of an S-band channel, and C-band channels and L-band channels are arranged through the inner hole; meanwhile, L / C and L / S-band rotary absorption rings for absorbing microwave leakage signals are arranged at the gaps of the L-band channels, and S / C-band rotary absorption rings for absorbing microwave leakage signals are arranged at the gaps between the S-band channels and the C-band channels. In the scheme, the improved rotary absorption ring design can realize a multi-channel rotary joint with high power and high isolation under the condition of allowing a large rotary gap and low processing requirement, the rotary absorption rings are arranged in a stepped type and a groove type respectively, the absorption efficiency is high, the isolation is high, and the microwave energy leakage can be effectively prevented.

Description

Technical Field

[0001] This invention belongs to the field of antenna microwaves, and specifically relates to a multi-channel rotary joint with an irregularly shaped rotating absorption ring. Background Technology

[0002] With the widespread application of modern electronic information technologies such as microwave radar, communication, measurement, and environmental monitoring in various fields, multi-band, multi-channel microwave signal transmission systems have become an indispensable and important component. When operating, radar and other electronic equipment typically employ antenna rotation scanning to acquire information across a 360° omnidirectional airspace. Therefore, a multi-channel rotating joint must be used between the antenna and the fixed transceiver device for multi-band microwave signal transmission.

[0003] Commonly used multi-channel rotary joints internally convert an external rectangular waveguide into a circular coaxial rotating component, and use choke slots to achieve electrical contact between the moving and stationary components with a rotational gap, enabling multi-channel microwave signal transmission. Some multi-channel rotary joints are simply combinations of multiple single-channel rotary joints through external structures; the disadvantage of this combination is that it cannot achieve 360° rotation.

[0004] Using microwave absorbing materials to create microwave absorbing rings to absorb leaked microwave signals is a common practice. Even in rotating joints, microwave absorbing rings are used for filling. Since rotating joints need to rotate 360°, a certain gap must be maintained between the rotating and stationary parts to prevent mechanical friction. This gap inevitably affects the absorption effect of the microwave absorbing ring.

[0005] To date, most multi-channel high-power microwave rotary joints, both domestically and internationally, use only a single high-power channel, while the other channels use medium or low power channels, and the isolation between channels is only around -50dB. Summary of the Invention

[0006] To address the above problems, the present invention aims to provide a multi-channel rotary joint with an irregularly shaped rotary absorption ring.

[0007] The specific technical solution for achieving the objective of this invention is as follows:

[0008] A multi-channel rotary joint with an irregularly shaped rotary absorption ring includes an L-band coaxial microwave signal rotary transmission channel, an S-band waveguide microwave signal rotary transmission channel, a C-band waveguide microwave signal rotary transmission channel, L / C and L / S band rotary absorption rings for absorbing microwave leakage signals, and an S / C band rotary absorption ring for absorbing microwave leakage signals.

[0009] A through-hole is provided at the center of the S-band waveguide-type microwave signal rotating transmission channel, and the C-band waveguide-type microwave signal rotating transmission channel and the L-band coaxial-type microwave signal rotating transmission channel respectively pass through the through-hole;

[0010] A rotating absorption ring for absorbing microwave leakage signals in the L / C and L / S bands is provided at the gap of the L-band coaxial microwave signal rotating transmission channel.

[0011] A rotating absorption ring for absorbing microwave leakage signals in the S / C band is provided at the gap between the S-band waveguide type microwave signal rotating transmission channel and the C-band waveguide type microwave signal rotating transmission channel.

[0012] Furthermore, the diameters d1 and d2 of the inner and outer conductors of the coaxial line in the S-band waveguide type microwave signal rotating transmission channel and the C-band waveguide type microwave signal rotating transmission channel are set according to the characteristic impedance formula of the coaxial line to maximize its power handling.

[0013] Furthermore, the intersection of the waveguide and the coaxial line of the S-band waveguide type microwave signal rotating transmission channel and the C-band waveguide type microwave signal rotating transmission channel is rounded.

[0014] Furthermore, the waveguide of the S-band waveguide type microwave signal rotating transmission channel is a BJ32 waveguide, and the waveguide of the C-band waveguide type microwave signal rotating transmission channel is a BJ48 waveguide.

[0015] Furthermore, the waveguide transmission channels of the S-band waveguide type microwave signal rotating transmission channel and the C-band waveguide type microwave signal rotating transmission channel are respectively provided with double door buttons. The outer surface of the door button is double-arc, and its arcs R1 and R2 are geometrically tangent to the inner diameter d2 of the coaxial line of the S-band waveguide type microwave signal rotating transmission channel and the C-band waveguide type microwave signal rotating transmission channel and the door button diameter D. The dimensions of the door button are set as follows:

[0016] D = 0.8L

[0017] H < 0.65b

[0018] Where D represents the gate diameter, L represents the waveguide width, H represents the gate height, and b represents the waveguide height.

[0019] Furthermore, the rotating absorption ring for absorbing microwave leakage signals in the S / C band is made of microwave absorbing material, and its inner ring thickness is greater than its outer ring thickness.

[0020] Furthermore, the signal leakage point of the coaxial channel of the L-band coaxial microwave signal rotating transmission channel is located at the bottom of the channel, and the signal leakage point at the bottom of the channel is set as a sawtooth groove. The rotating absorption rings for absorbing microwave leakage signals in the L / C and L / S bands are set as corresponding groove structures.

[0021] Furthermore, the preparation process of the absorbing material is as follows:

[0022] Carbonyl iron powder and epoxy resin are thoroughly mixed in a certain proportion to prepare microwave absorbing raw materials. Then, according to the gap size between the S-band waveguide type microwave signal rotating transmission channel and the C-band waveguide type microwave signal rotating transmission channel, the materials are pressed into shape, baked at high temperature in an oven, and then naturally cooled in the oven to obtain rigid microwave absorbing materials.

[0023] Furthermore, the ratio of carbonyl iron powder to epoxy resin is 20:3.

[0024] Furthermore, the microwave-absorbing raw material is baked at a temperature of 80±3℃ in the oven for a time of 5±0.5 hours.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] (1) The rotary joint of the present invention can withstand large microwave power; for S and C bands, the peak power is not less than 200kW, the average power is not less than 10kW, and the input voltage standing wave ratio is small, thus resulting in low insertion loss; the improvement of the absorption ring makes the isolation between the two channels reach below -90dB.

[0027] (2) The solution of the present invention, through the application of a rotating absorption ring, can realize a multi-channel rotating joint with high power and high isolation under the condition of allowing large rotational clearance and low processing requirements;

[0028] (3) In the present invention, the rotating absorption ring for absorbing microwave leakage signals in the L / C and L / S bands is set as a groove structure. Without generating rotational friction, the rotating absorption ring can cover its rotation gap, ensuring the normal rotation of the machine, and effectively absorbing the leakage microwave energy.

[0029] (4) The solution of the present invention can meet the transmission requirements of two (C / S band) high-power microwave signals and one (L band) medium-power microwave signal, can achieve 360° rotation, and the isolation between channels can reach below -90dB. The manufacturing process of the rotating absorption ring does not require vacuuming and high-temperature curing, and the processing is simple and easy to manufacture.

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the multi-channel rotary joint structure with an irregularly shaped rotary absorption ring of the present invention.

[0032] Figure 2 This is a schematic diagram of the gate button structure in the waveguide transmission channel of the present invention.

[0033] Figure 3 This is a schematic diagram of the S-band waveguide-type microwave signal rotating transmission channel of the present invention.

[0034] Figure 4 This is a schematic diagram of the C-band waveguide-type microwave signal rotating transmission channel of the present invention.

[0035] Figure 5 This is a schematic diagram of the rotating absorption ring for absorbing microwave leakage signals in the S / C band according to the present invention.

[0036] Figure 6 This is a schematic diagram of the improved L-band coaxial microwave signal rotating transmission channel of the present invention, wherein... Figure 6 (a) is a schematic diagram of the coaxial channel structure of a traditional L-band channel. Figure 6 (b) is a schematic diagram of the coaxial channel structure of the L-band channel of the present invention.

[0037] Figure 7 This is a schematic diagram of the rotating absorption structure for absorbing microwave leakage signals in the L / C and L / S bands of the present invention. Detailed Implementation

[0038] A multi-channel rotary joint with an irregularly shaped rotary absorption ring includes an L-band coaxial microwave signal rotary transmission channel 1, an S-band waveguide microwave signal rotary transmission channel 2, a C-band waveguide microwave signal rotary transmission channel 3, a rotary absorption ring 4 for absorbing microwave leakage signals in the L / C and L / S bands, and a rotary absorption ring 5 for absorbing microwave leakage signals in the S / C band.

[0039] The S-band waveguide type microwave signal rotating transmission channel 2 has a through-hole at its center, and the C-band waveguide type microwave signal rotating transmission channel 3 and the L-band coaxial type microwave signal rotating transmission channel 1 are respectively arranged through the through-hole.

[0040] A rotating absorption ring 4 for absorbing microwave leakage signals in the L / C and L / S bands is provided at the gap of the L-band coaxial microwave signal rotating transmission channel 1.

[0041] A rotating absorption ring 5 for absorbing microwave leakage signals in the S / C band is provided in the gap between the S-band waveguide type microwave signal rotating transmission channel 2 and the C-band waveguide type microwave signal rotating transmission channel 3.

[0042] In the high-power channel (S / C), based on the actual situation of the structural space, the diameters d1 and d2 of the inner and outer conductors of the coaxial line of the S-band waveguide type microwave signal rotating transmission channel 2 and the C-band waveguide type microwave signal rotating transmission channel 3 are set according to the characteristic impedance formula of the coaxial line. The characteristic impedance of the coaxial line is as close as possible to 30Ω to maximize its power handling capacity.

[0043] Furthermore, the intersection of the waveguide and the coaxial line of the S-band waveguide type microwave signal rotating transmission channel 2 and the C-band waveguide type microwave signal rotating transmission channel 3 is rounded.

[0044] Based on the operating frequency and power capacity requirements of C-band and S-band, the waveguide of the S-band waveguide-type microwave signal rotating transmission channel 2 in this scheme adopts the BJ32 waveguide, and the waveguide of the C-band waveguide-type microwave signal rotating transmission channel 3 adopts the BJ48 waveguide.

[0045] Furthermore, the waveguide transmission channels of the S-band waveguide type microwave signal rotating transmission channel 2 and the C-band waveguide type microwave signal rotating transmission channel 3 are respectively equipped with double gate buttons as mode conversion devices. The outer surface of the gate button is double-arc, and its arcs R1 and R2 are geometrically tangent to the inner diameter d2 of the coaxial line of the S-band waveguide type microwave signal rotating transmission channel 2 and the C-band waveguide type microwave signal rotating transmission channel 3 and the gate button diameter D. The dimensions of the gate button are set as follows:

[0046] D = 0.8L

[0047] H < 0.65b

[0048] Where D represents the gate diameter, L represents the waveguide width, H represents the gate height, and b represents the waveguide height.

[0049] The rotating absorption ring 5 for absorbing microwave leakage signals in the S / C band is made of microwave absorbing material. The rotation gap between the S-band and C-band channels is originally a plane with an inner thickness greater than the outer thickness, i.e., it is designed as a plane with a certain height difference. Alternatively, a step with a height and thickness difference can be further set. The step on the rotating absorption ring can effectively block the transmission of microwave signal energy. Compared with the previous case without the step, the isolation between the two channels has changed from -50dB to below -90dB, and the absorption efficiency has increased by more than 10,000 times.

[0050] In a typical L-band coaxial microwave signal rotating transmission channel structure, the microwave leakage path is located above the channel, close to the C-band channel, and short, resulting in an isolation of only -50dB between the two channels. To achieve better absorption, this design places the signal leakage point of the coaxial channel 1 below the channel, increasing the number of folds in the leakage signal path, altering the transmission path of the microwave leakage signal, and lengthening its transmission path to the C-band channel. Simultaneously, the signal leakage point below the channel is designed as a sawtooth groove, representing the outermost layer of the folds. Correspondingly, the rotating absorption ring 4 for absorbing microwave leakage signals in the L / C and L / S bands is designed with a corresponding groove structure. Compared to the previous design, the isolation has increased from -50dB to below -90dB, and the absorption efficiency has improved by more than 10,000 times.

[0051] The preparation process of the microwave absorbing material of the rotating absorption ring 5 for absorbing microwave leakage signals in the S / C band is as follows:

[0052] Carbonyl iron powder and epoxy resin are thoroughly mixed in a ratio of 20:3 to prepare microwave absorbing raw materials. Then, according to the gap size between the S-band waveguide type microwave signal rotating transmission channel 2 and the C-band waveguide type microwave signal rotating transmission channel 3, the materials are pressed into shape and baked in an oven at a temperature of 80±3℃ for 5±0.5 hours. After natural cooling in the oven, a rigid microwave absorbing material is obtained.

[0053] Example

[0054] Combination Figures 1 to 4 A multi-channel rotary joint with an irregularly shaped rotary absorption ring includes an L-band coaxial microwave signal rotary transmission channel 1, an S-band waveguide microwave signal rotary transmission channel 2, a C-band waveguide microwave signal rotary transmission channel 3, a rotary absorption ring 4 for absorbing microwave leakage signals in the L / C and L / S bands, and a rotary absorption ring 5 for absorbing microwave leakage signals in the S / C band.

[0055] The S-band waveguide type microwave signal rotating transmission channel 2 has a through-hole at its center, and the C-band waveguide type microwave signal rotating transmission channel 3 and the L-band coaxial type microwave signal rotating transmission channel 1 are respectively arranged through the through-hole.

[0056] A rotating absorption ring 4 for absorbing microwave leakage signals in the L / C and L / S bands is provided at the gap of the L-band coaxial microwave signal rotating transmission channel 1.

[0057] A rotating absorption ring 5 for absorbing microwave leakage signals in the S / C band is provided in the gap between the S-band waveguide type microwave signal rotating transmission channel 2 and the C-band waveguide type microwave signal rotating transmission channel 3.

[0058] In the high-power channel (S / C), based on the actual situation of the structural space, the diameters d1 and d2 of the inner and outer conductors of the coaxial line of the S-band waveguide type microwave signal rotating transmission channel 2 and the C-band waveguide type microwave signal rotating transmission channel 3 are set according to the characteristic impedance formula of the coaxial line. The characteristic impedance of the coaxial line is as close as possible to 30Ω to maximize its power handling capacity.

[0059] Based on the operating frequency and power capacity requirements of C-band and S-band, the waveguide of the S-band waveguide-type microwave signal rotating transmission channel 2 in this scheme adopts the BJ32 waveguide, and the waveguide of the C-band waveguide-type microwave signal rotating transmission channel 3 adopts the BJ48 waveguide.

[0060] Combination Figure 2 The intersection of the waveguide and the coaxial line of the S-band waveguide type microwave signal rotating transmission channel 2 and the C-band waveguide type microwave signal rotating transmission channel 3 is rounded.

[0061] Furthermore, the waveguide transmission channels of the S-band waveguide type microwave signal rotating transmission channel 2 and the C-band waveguide type microwave signal rotating transmission channel 3 are respectively equipped with double gate buttons as mode conversion devices. The outer surface of the gate button is double-arc, and its arcs R1 and R2 are geometrically tangent to the inner diameter d2 of the coaxial line of the S-band waveguide type microwave signal rotating transmission channel 2 and the C-band waveguide type microwave signal rotating transmission channel 3 and the gate button diameter D. The dimensions of the gate button are set as follows:

[0062] D = 0.8L

[0063] H < 0.65b

[0064] Where D represents the gate diameter, L represents the waveguide width, H represents the gate height, and b represents the waveguide height.

[0065] Combination Figure 5 The rotating absorption ring 5 for absorbing microwave leakage signals in the S / C band is made of microwave absorbing material. The rotation gap between the S-band and C-band channels is originally a plane with an inner thickness greater than the outer thickness, i.e., it is designed as a plane with a certain height difference. Alternatively, a step with a height and thickness difference can be further set. In this embodiment, the height difference is set to 0.4mm. The step on the rotating absorption ring can effectively block the transmission of microwave signal energy. Compared with the previous case without the step, the isolation between the two channels has changed from -50dB to below -90dB, and the absorption efficiency has been improved by more than 10,000 times.

[0066] Combination Figure 6a. In a typical L-band coaxial microwave signal rotating transmission channel structure, the microwave leakage path is located above the channel, close to the C-band channel, and short, resulting in an isolation of only -50dB between the two channels. To achieve better absorption, in this scheme, the signal leakage point of the coaxial channel in the L-band coaxial microwave signal rotating transmission channel 1 is located below the channel. This increases the number of folds in the leakage signal path, alters the transmission path of the microwave leakage signal, and lengthens its transmission path to the C-band channel. For example... Figure 6 b; Simultaneously, the signal leakage point below the channel is designed as a sawtooth groove, i.e., the outermost layer of the folded layers. Correspondingly, the rotating absorption ring 4 for absorbing microwave leakage signals in the L / C and L / S bands is designed as a corresponding groove structure. Compared to before, the isolation has also changed from -50dB to below -90dB, and the absorption efficiency has increased by more than 10,000 times. Figure 7 As shown.

[0067] The preparation process of the microwave absorbing material of the rotating absorption ring 5 for absorbing microwave leakage signals in the S / C band is as follows:

[0068] Carbonyl iron powder and epoxy resin are thoroughly mixed in a ratio of 20:3 to prepare microwave absorbing raw materials. Then, according to the gap size between the S-band waveguide type microwave signal rotating transmission channel 2 and the C-band waveguide type microwave signal rotating transmission channel 3, the materials are pressed into shape and baked in an oven at a temperature of 80±3℃ for 5±0.5 hours. After natural cooling in the oven, a rigid microwave absorbing material is obtained.

[0069] The multi-channel rotary joint with irregularly shaped rotating absorption ring in this solution has a peak power of not less than 200kW, an average power of not less than 10kW, an input voltage standing wave ratio of not more than 1.20, and an insertion loss of less than 0.2dB in the S and C bands; and a peak power of not less than 10.0kW, an average power of not less than 500W, an input voltage standing wave ratio of less than 1.35, and an insertion loss of less than 0.35dB in the L band. The isolation between channels is below -90dB.

[0070] The above embodiments illustrate and describe the basic principles and main features of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A multi-channel rotary joint with an irregularly shaped rotary absorption ring, characterized in that, Including L-band coaxial microwave signal rotating transmission channel (1), S-band waveguide microwave signal rotating transmission channel (2), C-band waveguide microwave signal rotating transmission channel (3), L / C and L / S band rotating absorption rings for absorbing microwave leakage signals (4), and S / C band rotating absorption rings for absorbing microwave leakage signals (5). The S-band waveguide type microwave signal rotating transmission channel (2) has a through-hole at its center, and the C-band waveguide type microwave signal rotating transmission channel (3) and the L-band coaxial type microwave signal rotating transmission channel (1) respectively pass through the through-hole. A rotating absorption ring (4) for absorbing microwave leakage signals in the L / C and L / S bands is set at the gap of the L-band coaxial microwave signal rotating transmission channel (1). A rotating absorption ring (5) for absorbing microwave leakage signals in the S / C band is set in the gap between the S-band waveguide type microwave signal rotating transmission channel (2) and the C-band waveguide type microwave signal rotating transmission channel (3). The rotating absorption ring (5) for absorbing microwave leakage signals in the S / C band is made of microwave absorbing material, and its inner ring thickness is greater than its outer ring thickness. The signal leakage point of the coaxial channel of the L-band coaxial microwave signal rotating transmission channel (1) is located at one end away from the C-band waveguide microwave signal rotating transmission channel (3). At the same time, the signal leakage point is set as a sawtooth groove, and the rotating absorption ring (4) of the L / C and L / S bands that absorbs microwave leakage signals is set as a corresponding groove structure.

2. The multi-channel rotary joint with an irregularly shaped rotary absorption ring according to claim 1, characterized in that, The diameters d1 and d2 of the inner and outer conductors of the channel coaxial line of the S-band waveguide type microwave signal rotating transmission channel (2) and the C-band waveguide type microwave signal rotating transmission channel (3) are set according to the characteristic impedance formula of the coaxial line.

3. The multi-channel rotary joint with an irregularly shaped rotary absorption ring according to claim 2, characterized in that, The intersection of the waveguide and the coaxial line of the S-band waveguide type microwave signal rotating transmission channel (2) and the C-band waveguide type microwave signal rotating transmission channel (3) is rounded.

4. The multi-channel rotary joint with an irregularly shaped rotary absorption ring according to claim 1, characterized in that, The waveguide of the S-band waveguide type microwave signal rotating transmission channel (2) is a BJ32 waveguide, and the waveguide of the C-band waveguide type microwave signal rotating transmission channel (3) is a BJ48 waveguide.

5. The multi-channel rotary joint with an irregularly shaped rotary absorption ring according to claim 4, characterized in that, The waveguide transmission channels of the S-band waveguide type microwave signal rotating transmission channel (2) and the C-band waveguide type microwave signal rotating transmission channel (3) are respectively provided with double door buttons. The outer surface of the door button is double arc-shaped, and the double arc-shaped is tangent to the inner diameter of the coaxial line of the corresponding microwave signal rotating transmission channel and the diameter of the door button, respectively. The dimensions of the door button are set as follows: D=0.8L; H < 0.65b; Where D represents the gate diameter, L represents the waveguide width, H represents the gate height, and b represents the waveguide height.

6. The multi-channel rotary joint with an irregularly shaped rotary absorption ring according to claim 1, characterized in that, The preparation process of the microwave absorbing material is as follows: Carbonyl iron powder and epoxy resin are thoroughly mixed in a certain proportion to make microwave absorbing raw materials. Then, according to the gap size between the S-band waveguide type microwave signal rotating transmission channel (2) and the C-band waveguide type microwave signal rotating transmission channel (3), the materials are pressed into shape, baked at high temperature in an oven, and then naturally cooled in the oven to obtain rigid microwave absorbing materials.

7. The multi-channel rotary joint with an irregularly shaped rotary absorption ring according to claim 6, characterized in that, The ratio of carbonyl iron powder to epoxy resin is 20:

3.

8. The multi-channel rotary joint with an irregularly shaped rotary absorption ring according to claim 6, characterized in that, The microwave-absorbing raw material is baked at a temperature of 80±3℃ in the oven for 5±0.5 hours.

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