High-power threshold duplexer for satellite-borne low-pressure environment

Abstract

The invention discloses a high-power threshold duplexer for a satellite-borne low-air-pressure environment, belongs to the technical field of satellite-borne filters, and solves the problems that the standing wave becomes poor and the loss is increased due to overhigh power of the filter, and the performance of the filter is easily damaged due to high power in the low-air-pressure environment. The radio-frequency connector comprises a cavity, two filters are arranged in the cavity, two single-port radio-frequency connectors and a common port radio-frequency connector are arranged on the cavity, and the two single-port radio-frequency connectors are connected with two single-port side rods; the common port radio frequency connector is connected with the common port side rod; the two single-port side rods are respectively connected with the common port side rod through the two filters to form two paths; the single-port side rod and the common port side rod are both wrapped with wrapping media. According to the invention, the wrapping medium is adopted to wrap the single-port side rod and the common port side rod, so that the power threshold in a low-pressure environment can be improved, the bearable maximum power of the filter can be increased, and the reliability of the filter can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spaceborne filter, and particularly relates to a high-power threshold duplexer for spaceborne low-pressure environment. BACKGROUND

[0002] The duplexer is a kind of radio frequency device capable of realizing the bidirectional communication function of wireless communication equipment, and its core function is to use the filter to completely isolate the frequencies of the transmitting and receiving signals, so as to avoid the interference of the transmitting signal on the receiver, and at the same time ensure that the receiving signal can be correctly processed. The main function of the filter is to allow a specific frequency signal to pass through, suppress or eliminate other frequency components, and there are usually band-pass filters, low-pass filters and high-pass filters.

[0003] With the rapid development of communication technology, the requirement for the power of the filter is also higher and higher, and when designing the filter, the power capacity, passband voltage standing wave ratio and insertion loss and the like need to be considered. When the passband voltage standing wave ratio and the insertion loss are large, problems such as heating, power capacity reduction and system performance deterioration will be caused. The existing cavity filter has the advantages of low loss, high power capacity, strong out-of-band suppression and good temperature stability, but in a low-pressure environment or even a vacuum environment, excessive power can easily cause damage to the filter, resulting in poor standing wave of the filter, increased loss, reduced suppression and affected precision of the filter. SUMMARY

[0004] In view of the problems in the prior art, the present application provides a high-power threshold duplexer for spaceborne low-pressure environment, which solves the problem of poor standing wave, increased loss and reduced suppression of the filter in the existing duplexer due to excessive power, and the problem that in a low-pressure environment, excessive power can easily damage the performance of the filter.

[0005] In the first aspect, in order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: A high-power threshold duplexer for spaceborne low-pressure environment, comprising a cavity, two filters are arranged inside the cavity; two single-port radio frequency connectors and a common-port radio frequency connector are arranged on the cavity, the two single-port radio frequency connectors are respectively connected with two single-port side rods, and the common-port radio frequency connector is connected with a common-port side rod; the two single-port side rods are connected with the common-port side rod through the two filters, forming two paths; the single-port side rod and the common-port side rod are both provided with a wrapping medium.

[0006] In the scheme, the radio frequency signal enters from the common port radio frequency connector, is transmitted to the common port edge pole through the connection of the common port radio frequency connector and the common port edge pole, and is transmitted to the single port edge pole through one of the filters of the common port edge pole. The single port edge pole and the common port edge pole are wrapped with a wrapping medium, which can improve the power threshold in a low pressure environment, increase the maximum power that the filter can withstand, and improve the reliability of the filter.

[0007] Further, the filter includes four dielectric resonators, the common port edge pole is coupled to the first dielectric resonator, the first dielectric resonator is coupled to the second dielectric resonator, the second dielectric resonator is coupled to the third dielectric resonator, and the third dielectric resonator is coupled to the fourth dielectric resonator; and the fourth dielectric resonator is coupled to the single port edge pole.

[0008] In the scheme, the common port edge pole transmits the signal to the first dielectric resonator through coupling, and then adjusts the frequencies of the first, second, third and fourth dielectric resonators and the coupling strength therebetween to ensure that the radio frequency signal is smoothly transmitted to the fourth dielectric resonator, and finally transmitted from the fourth dielectric resonator to the single port edge pole. When simulating in the product design stage, the distance between the common port edge pole and the first dielectric resonator can be adjusted to ensure that the signal can be smoothly transmitted to the first dielectric resonator; the distance between the single port edge pole and the fourth dielectric resonator and the thickness of the wrapping medium wrapping the single port edge pole can also be adjusted to ensure that the radio frequency signal can be transmitted from the fourth dielectric resonator to the single port edge pole.

[0009] Further, the top of the cavity is provided with a cover plate, the cover plate is threadedly connected with a fastening screw, the bottom of the fastening screw abuts against a pressing plate, and the bottom of the pressing plate is provided with a pressing piece; and the bottom of the pressing piece is pressed against the upper surface of the cavity.

[0010] In the scheme, the pressing piece is pressed against the cavity by the fastening screw, which ensures the sealing of the duplexer and prevents signal leakage, so that the insertion loss of the duplexer is guaranteed; meanwhile, the pressing plate is fixed between the cover plate and the pressing piece, which allows the pressing piece to be locally stressed and fully contact the cavity and the dielectric resonator in the cavity.

[0011] Further, the wrapping medium includes an upper half portion and a lower half portion, the upper half portion and the lower half portion wrap the top and bottom of the single port edge pole or the common port edge pole respectively; a through hole is formed at the joint between the upper half portion and the lower half portion, a conductor of the single port radio frequency connector penetrates through the through hole and is welded to the single port edge pole; and a conductor of the common port radio frequency connector penetrates through the through hole and is welded to the common port edge pole.

[0012] In the scheme, the close fit of the upper half of the medium and the lower half of the medium has reliability and consistency, and the assembly process is relatively simple and easy to implement. The single-port radio frequency connector is connected with the single-port edge rod through the welding technology, the welding process is simple and easy to operate, there is no problem of too high operation difficulty and not easy to implement, and the welding point is firm, and the product has good performance.

[0013] Further, the top of the upper half of the medium is higher than the upper surface of the cavity, and the tablet is pressed to fix the high part.

[0014] In the scheme, the tablet is pressed to the upper half of the medium to improve the stability of the wrapped medium, and the close connection of the upper half of the medium and the lower half of the medium is also ensured.

[0015] Further, the bottom of the cavity is provided with a tuning screw corresponding to the medium resonator; the tuning screw penetrates the bottom of the cavity and extends into the interior of the medium resonator. The threaded hole of the cover plate is also provided with a coupling screw, the bottom of the coupling screw penetrates the tablet and extends into the cavity; one coupling screw is arranged between every two adjacent medium resonators.

[0016] In the scheme, by adjusting the depth of the coupling screw inserted into the cavity, the electromagnetic field coupling coefficient between the medium resonators can be adjusted, and then the bandwidth of the signal can be adjusted; by adjusting the length of the tuning screw extending into the cavity, the resonant frequency of the medium resonator can be adjusted, the performance of the diplexer is optimized, and it is ensured that each index meets the demand; here, the tuning screw considers the power aspect, under the premise of ensuring the performance of the diplexer, the shorter the length of the tuning screw extending into the cavity, the higher the power threshold of the diplexer under low air pressure.

[0017] Further, a plurality of ordinary screws are arranged in the screw holes on the cover plate, the bottom of the ordinary screw penetrates the tablet and is threadedly connected to the cavity.

[0018] Further, the bottom of the cavity is also provided with an edge rod fixing screw, the edge rod fixing screw extends from the bottom of the cavity and is connected with the common port edge rod or the single-port edge rod.

[0019] Further, the material of the wrapped medium is polytetrafluoroethylene or polyether ether copper.

[0020] Further, the filter is a four-cavity Chebyshev filter.

[0021] The beneficial effects of the present application are: The high-power threshold duplexer for low-pressure environments on spacecraft provided by this invention incorporates a wrapping medium on both the single-port and common-port side rods. This wrapping medium primarily enhances the power threshold under low-pressure conditions, increasing the maximum power the filter can withstand and providing sufficient assurance for its performance. This results in high power output, high suppression, and low insertion loss. Simultaneously, it strengthens the coupling between the common-port side rod and the first dielectric resonator. Testing showed that during the pressure drop from ambient pressure to a vacuum, the in-band loss of both duplexer paths was less than 0.8 dB, in-band fluctuations were stable, and the in-band VSWR was less than 1.3. The duplexer can withstand a power greater than 30 W during the pressure drop. Compared to filters with sealed covers, this eliminates the welding step, making filter manufacturing and assembly simpler and easier, and facilitating mass production. Attached Figure Description

[0022] Figure 1 This is an exploded view of a high-power threshold duplexer for spaceborne low-pressure environments according to the present invention. Figure 2 This is a top view of the internal structure of the cavity in this invention; Figure 3 This is a schematic diagram of the fastening screws, ordinary screws, and coupling screws on the cover plate in this invention; Figure 4 This is an exploded view of the cavity, the encapsulating medium, the single-port side rod, and the common-port side rod in this invention; Figure 5 This is a cross-sectional view of the cavity in this invention.

[0023] Figure label: 1. Cover plate; 2. Pressure plate; 3. Pressure plate; 4. Encasing medium; 41. Lower half of the medium; 42. Upper half of the medium; 5. Single-port RF connector; 6. Cavity; 7. Tuning screw; 8. Fastening screw; 9. Common port RF connector; 10. Single-port side rod; 11. Common port side rod; 12. Dielectric resonator; 13. General purpose screw; 14. Coupling screw; 15. Side rod fixing screw; Detailed Implementation The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Specific embodiments of the present invention are described below to facilitate understanding by those skilled in the art. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various modifications are obvious as long as they fall within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0024] like Figure 1 and Figure 2As shown, the embodiment provides a high-power threshold duplexer for a spaceborne low-pressure environment, solves the problem of poor standing wave, increased loss and reduced suppression of the filter in the existing duplexer due to excessive power, and the problem of easy damage to the filter performance in a low-pressure environment; it specifically includes: The cover plate 1, the pressing plate 2, the pressing sheet 3, the wrapping medium 4, the cavity 6, the two single-port radio frequency connectors 5, the two single-port edge bars 10, the common port radio frequency connector 9, the common port edge bar 11 and the two filters; Wherein, the top of the cavity 6 is provided with a cover plate 1, the inside of the cavity 6 is provided with two filters, the two sides of the cavity 6 are respectively provided with two single-port radio frequency connectors 5, the two single-port radio frequency connectors 5 are respectively connected with two single-port edge bars 10; the middle of the cavity 6 is provided with a common port radio frequency connector 9, the common port radio frequency connector 9 is connected with a common port edge bar 11; the two single-port edge bars 10 are respectively connected with the common port edge bar 11 through the two filters, forming two paths. The single-port edge bar 10 and the common port edge bar 11 are wrapped with wrapping medium 4, which can improve the power threshold in a low-pressure environment, increase the maximum power that the filter can withstand, and improve the reliability of the filter.

[0025] As Figure 3 As shown, the cover plate 1 is threadedly connected with a fastening screw 8, the bottom of the fastening screw 8 abuts against a pressing plate 2, and the bottom of the pressing plate 2 is provided with a pressing sheet 3; the bottom of the pressing sheet 3 is pressed against the upper surface of the cavity 6. The pressing sheet 3 is pressed against the cavity 6 by the fastening screw 8, ensuring the sealing of the duplexer, preventing signal leakage, and ensuring the insertion loss of the duplexer; at the same time, the pressing plate 2 is fixed between the cover plate 1 and the pressing sheet 3, which can make the pressing sheet 3 locally stressed and fully contact with the cavity 6 and the medium resonator 12 in the cavity.

[0026] The filter comprises four dielectric resonators 12, a common port edge rod 11 is coupled to the first dielectric resonator 12, the first dielectric resonator 12 is coupled to the second dielectric resonator 12, the second dielectric resonator 12 is coupled to the third dielectric resonator 12, and the third dielectric resonator 12 is coupled to the fourth dielectric resonator 12; the fourth dielectric resonator 12 is coupled to the single-port edge rod 10. The common port edge rod 11 transmits signals to the first dielectric resonator 12 through coupling, and then adjusts the frequencies of the first dielectric resonator 12, the second dielectric resonator 12, the third dielectric resonator 12 and the fourth dielectric resonator 12 and the coupling strength therebetween to ensure that the radio frequency signals are smoothly transmitted to the fourth dielectric resonator 12, and finally transmitted from the fourth dielectric resonator 12 to the single-port edge rod 10. During simulation in the product design stage, the distance between the common port edge rod 11 and the first dielectric resonator 12 can be adjusted to ensure that the signals can be smoothly transmitted to the first dielectric resonator 12; the distance between the single-port edge rod 10 and the fourth dielectric resonator 12 and the thickness of the wrapping medium 4 wrapping the single-port edge rod 10 can also be adjusted to ensure that the radio frequency signals can be transmitted from the fourth dielectric resonator 12 to the single-port edge rod 10.

[0027] The bottom of the cavity 6 is provided with a tuning screw 7 corresponding to each dielectric resonator 12; the tuning screw 7 penetrates the bottom of the cavity 6 and extends into the dielectric resonator 12. The threaded hole of the cover plate 1 is also provided with a coupling screw 14, the bottom of the coupling screw 14 penetrates the tablet 3 and extends into the cavity 6; one coupling screw 14 is arranged between every two adjacent dielectric resonators 12. By adjusting the depth of the coupling screw 14 inserted into the cavity 6, the electromagnetic field coupling coefficient between the dielectric resonators 12 can be adjusted, and then the bandwidth of the signal can be adjusted. By adjusting the length of the tuning screw 7 extending into the cavity 6, the resonant frequency of the dielectric resonator 12 can be adjusted, the performance of the duplexer can be optimized, and the indicators can meet the requirements; here, the tuning screw 7 considers the power aspect, and under the premise of ensuring the performance of the duplexer, the shorter the length of the tuning screw 7 extending into the cavity, the higher the power threshold of the duplexer under low air pressure.

[0028] As Figure 4 and Figure 5As shown, the wrapping medium 4 comprises an upper half medium 42 and a lower half medium 41, which are wrapped on the top and bottom of the single-port edge pole 10 or the common-port edge pole 11 respectively; the close fit of the upper half medium 42 and the lower half medium 41 has reliability and consistency, and the assembly process is relatively simple and easy to realize. A through hole is formed at the joint between the upper half medium 42 and the lower half medium 41, the conductor of the single-port RF connector 5 penetrates through the through hole and is welded to the single-port edge pole 10; the conductor of the common-port RF connector 9 penetrates through the through hole and is welded to the common-port edge pole 11. The single-port RF connector 5 is connected with the single-port edge pole 10 through welding technology, the welding process is simple and easy to operate, and there is no problem of high operation difficulty and difficult to realize, and the welding point is firm, and the product has good performance. It should be noted that the amount of soldering tin at the welding connection should be controlled, and the soldering point should not be too large to ensure the close connection of the joint between the upper half medium 42 and the lower half medium 41.

[0029] The top of the upper half medium 42 is higher than the upper surface of the cavity 6 Figure 4 The bottom of the middle cavity 6 is upward, and the pressing plate 3 extrudes and fixes the high part, which improves the stability of the wrapping medium 4 and ensures the close connection of the upper half medium 42 and the lower half medium 41.

[0030] A plurality of ordinary screws 13 are also arranged in the screw holes of the cover plate 1, the bottom of the ordinary screw 13 penetrates through the pressing plate 3 and is threadedly connected to the cavity 6.

[0031] As shown in Figure 4 The bottom of the cavity 6 is also provided with an edge pole fixing screw 15, which extends from the bottom of the cavity 6 and is connected with the common-port edge pole 11 or the single-port edge pole 10.

[0032] As a preferred embodiment of the present embodiment, the material of the wrapping medium 4 is polytetrafluoroethylene or polyether ether copper.

[0033] As a preferred embodiment of the present embodiment, the filter is a four-cavity Chebyshev filter.

[0034] The working principle of the present embodiment is as follows: In the high-power threshold duplexer for spaceborne low-pressure environment of the embodiment, the two-path transmission modes are consistent. Taking the high-frequency end path as an example, the radio frequency signal enters from the common port radio frequency connector 9, is transmitted to the common port edge pole 11 through the welding connection of the common port radio frequency connector 9 and the common port edge pole 11, is transmitted to the first dielectric resonator 12 on the common port edge pole 11, and is transmitted to the single port edge pole 10 in turn through the first dielectric resonator 12, the second dielectric resonator 12, the third dielectric resonator 12 and the fourth dielectric resonator 12. Similarly, the single port edge pole 10 can transmit the signal to the single port radio frequency connector 5 through the welding connection.

[0035] The transmission from the single port radio frequency connector 5 to the common port radio frequency connector 9 can also be used in reverse.

[0036] Those skilled in the art will realize that the embodiments described herein are for the purpose of helping the reader understand the principles of the present application and should be understood as not limiting the scope of protection of the present application to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations according to the technical inspiration of the present application without departing from the essence of the present application, and these modifications and combinations are still within the scope of protection of the present application.

Claims

1. A high-power threshold duplexer for use in low-pressure environments on space, characterized in that: The device includes a cavity (6), inside which two filters are provided; the cavity (6) is provided with two single-port RF connectors (5) and one common port RF connector (9), the two single-port RF connectors (5) are respectively connected to two single-port side rods (10), and the common port RF connector (9) is connected to the common port side rod (11); the two single-port side rods (10) are respectively connected to the common port side rod (11) through two filters, forming two paths; both the single-port side rods (10) and the common port side rod (11) are provided with a wrapping medium (4).

2. The high-power threshold duplexer for spaceborne low-pressure environments according to claim 1, characterized in that: The filter includes four dielectric resonators (12). The common port side rod (11) is coupled to the first dielectric resonator (12), the first dielectric resonator (12) is coupled to the second dielectric resonator (12), the second dielectric resonator (12) is coupled to the third dielectric resonator (12), the third dielectric resonator (12) is coupled to the fourth dielectric resonator (12), and the fourth dielectric resonator (12) is coupled to the single-port side rod (10).

3. The high-power threshold duplexer for spaceborne low-pressure environments according to claim 2, characterized in that: The top of the cavity (6) is provided with a cover plate (1), and a fastening screw (8) is threaded onto the cover plate (1). The bottom of the fastening screw (8) abuts against a pressure plate (2), and a pressure plate (3) is provided at the bottom of the pressure plate (2). The bottom of the pressure plate (3) is pressed against the upper surface of the cavity (6).

4. The high-power threshold duplexer for spaceborne low-pressure environments according to claim 3, characterized in that: The wrapping medium (4) includes an upper half medium (42) and a lower half medium (41), which respectively wrap around the top and bottom of the single-port side rod (10) or the common port side rod (11); a through hole is provided at the joint between the upper half medium (42) and the lower half medium (41), and the conductor of the single-port RF connector (5) is welded to the single-port side rod (10) through the through hole; the conductor of the common port RF connector (9) is welded to the common port side rod (11) through the through hole.

5. The high-power threshold duplexer for spaceborne low-pressure environments according to claim 4, characterized in that: The top of the upper medium (42) is higher than the upper surface of the cavity (6), and the pressure plate (3) squeezes and fixes the higher part.

6. The high-power threshold duplexer for spaceborne low-pressure environments according to claim 3, characterized in that: The bottom of the cavity (6) is equipped with tuning screws (7) that correspond one-to-one with the dielectric resonator (12); the tuning screws (7) penetrate the bottom of the cavity (6) and extend into the interior of the dielectric resonator (12); A coupling screw (14) is also provided in the threaded hole of the cover plate (1). The bottom of the coupling screw (14) passes through the pressure plate (3) and extends into the cavity (6). A coupling screw (14) is provided between each two adjacent dielectric resonators (12).

7. The high-power threshold duplexer for spaceborne low-pressure environments according to claim 3, characterized in that: Several ordinary screws (13) are also provided in the screw holes on the cover plate (1). The bottom of the ordinary screws (13) passes through the pressure plate (3) and is threaded onto the cavity (6).

8. The high-power threshold duplexer for spaceborne low-pressure environments according to any one of claims 1 to 7, characterized in that: The bottom of the cavity (6) is also provided with a side rod fixing screw (15), which extends from the bottom of the cavity (6) and is connected to the common port side rod (11) or the single port side rod (10).

9. The high-power threshold duplexer for spaceborne low-pressure environments according to any one of claims 1 to 7, characterized in that: The material of the encapsulation medium (4) is polytetrafluoroethylene or polyether ether copper.

10. The high-power threshold duplexer for spaceborne low-pressure environments according to any one of claims 1 to 7, characterized in that: The filter is a four-cavity Chebyshev filter.

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