A temperature adaptive waveguide filter and tuning method thereof

Abstract

The present invention discloses a temperature adaptive waveguide filter and a tuning method thereof, wherein the waveguide filter comprises a plurality of resonant cavities, a plurality of tuning structures, a driving component connected to the tuning structure, a driving control component connected to the driving component, and a temperature sensing chip connected to the driving control component, wherein one resonant cavity corresponds to one tuning structure. The temperature sensing chip monitors the temperature of the waveguide filter during operation and reports the temperature to the driving control component in real time; the driving control component calculates the temperature change value of the waveguide filter and controls the driving component to drive the tuning structure to correct the frequency in the resonant cavity according to the temperature change value. Since the temperature drift problem does not need to be considered in the design of the present invention, there is no need to increase the number of stages of the waveguide filter, which reduces the volume and significantly reduces the cost.

Description

Technical Field

[0001] The present invention relates to a waveguide filter, and in particular to a temperature adaptive waveguide filter capable of automatically compensating frequency according to temperature and a tuning method thereof. Background Art

[0002] When traditional waveguide filters are working, their frequency changes greatly due to the large temperature drift. However, in actual design, customers often require a narrow working bandwidth, even only tens of megahertz, and the temperature drift is generally also tens of megahertz. In this way, the frequency is not within the required working bandwidth, making the filter unable to work normally.

[0003] To solve this problem, the traditional design method is to increase the design bandwidth while meeting the customer's insertion loss and suppression indicators over the full temperature range. However, such products often result in many filter stages, large size, and high cost. Summary of the invention

[0004] The object of the present invention is to overcome the defects of the prior art and provide a temperature adaptive waveguide filter and a tuning method thereof which can reduce the number of filter stages and reduce the cost.

[0005] To achieve the above object, the present invention proposes the following technical solution: a temperature adaptive waveguide filter, comprising a plurality of resonant cavities, a tuning structure for tuning the resonant cavities, a driving component connected to the tuning structure, a driving control component connected to the driving component, and a temperature sensing chip connected to the driving control component, wherein one resonant cavity corresponds to one tuning structure, the temperature sensing chip monitors the temperature of the waveguide filter when it is working, and reports the temperature to the driving control component in real time; the driving control component calculates the temperature change value of the waveguide filter, and controls the driving component to drive the tuning structure to correct the frequency in the resonant cavity according to the temperature change value.

[0006] Preferably, the waveguide filter further comprises a box body, an upper cover plate fixed on the box body and a plurality of tuning columns, a plurality of the resonant cavities are arranged in the box body, the tuning columns are fixed on the upper cover plate and extend into the resonant cavities, and one tuning column corresponds to one resonant cavity.

[0007] Preferably, the tuning structure includes a driving plate connected to the driving assembly and a plurality of coupling rods fixed on the driving plate, each coupling rod corresponds to a resonant cavity and a tuning column in the resonant cavity, and the driving plate, when driven by the driving assembly, drives the coupling rod to extend into the resonant cavity to couple with the corresponding resonant cavity and the tuning column.

[0008] Preferably, the drive control component includes a socket, a first circuit board and a second circuit board, the socket is mounted on the first circuit board, the first circuit board is mounted on a box body and electrically connected to the second circuit board, the second circuit board is mounted in the box body and electrically connected to the drive component, and the temperature sensor chip is electrically connected to the second circuit board.

[0009] Preferably, the first circuit board and the second circuit board, and the second circuit board and the driving assembly are all electrically connected via cables, and the temperature sensor chip is arranged on the second circuit board.

[0010] Preferably, the driving assembly comprises a motor, a rotating shaft connected to the motor, and a driving ring movably mounted on the rotating shaft, and the driving ring is connected to the driving plate.

[0011] Preferably, the coupling rod comprises a support rod and metal particles, one end of the support rod is fixed on the driving plate, and the other end is fixed to the metal particles; the metal particles are located at the side ends of the resonant cavity and the tuning column.

[0012] Preferably, the support rod is in an L-shape bent toward the resonance cavity.

[0013] Preferably, the metal particles are provided with grooves.

[0014] Preferably, the grooves on the metal particles are arranged at the front end and both side ends thereof.

[0015] Preferably, the adjustable waveguide filter further comprises a lower cover plate fixed on the lower end surface of the box body.

[0016] The present invention also provides another technical solution: a tuning method based on the above-mentioned temperature adaptive waveguide filter, comprising: the temperature sensor chip monitors the temperature of the waveguide filter during operation, and reports the temperature to the drive control component in real time; the drive control component calculates the temperature change value of the waveguide filter, and controls the drive component to drive the tuning structure to correct the frequency in the resonant cavity according to the temperature change value.

[0017] Preferably, the process in which the drive control component controls the drive component to drive the tuning structure to correct the frequency in the resonant cavity according to the temperature change value includes: the drive control component controls the drive component to drive the coupling rod to extend from the side end of the resonant cavity into the resonant cavity according to the temperature change value, and as the coupling rod moves, the coupling rod couples with the corresponding resonant cavity and the tuning column to correct the frequency in the resonant cavity.

[0018] The beneficial effects of the present invention are as follows: the present invention detects the temperature of the waveguide resonant cavity through a temperature detection chip, controls a motor when the temperature changes, drives the tuning structure in the waveguide filter to tune the frequency automatically, thereby performing frequency compensation, avoiding over-design due to temperature drift, thereby reducing the number of filter stages, reducing the filter volume, and significantly reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention after assembly;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention after the upper cover plate is assembled;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention after the lower cover plate is assembled;

[0022] Figure 4 , Figure 5 It is a schematic diagram of the explosion structure of the present invention in different directions;

[0023] Figure 6 is a cross-sectional schematic diagram of the present invention;

[0024] Figure 7 , Figure 8 They are schematic diagrams of the structure of the coupling rod of the present invention from different viewing angles;

[0025] Fig. 9 It is a principle block diagram of the filter of the present invention.

[0026] Reference numerals:

[0027] 1. Upper cover, 2. Box, 3. Drive plate, 4. Lower cover, 5. Tuning column, 6. Resonant cavity, 7. Socket mounting portion, 8. Motor, 9. Rotating shaft, 10. Drive ring, 11. Motor receiving hole, 12. Connecting portion, 13. Coupling rod, 131. Support rod, 132. Metal particles, 133. Groove, 134. Receiving hole, 14. Through hole, 15. Socket, 16. First circuit board, 17. Second circuit board, 18. Temperature sensor chip. DETAILED DESCRIPTION

[0028] The technical solutions of the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention.

[0029] The present invention discloses a temperature adaptive waveguide filter and a tuning method thereof, which detects the temperature of a waveguide resonant cavity and automatically compensates the frequency when the temperature changes, so that the filter always works at the correct starting frequency.

[0030] Combination Figure 1 to Figure 6As shown, a temperature adaptive waveguide filter disclosed in an embodiment of the present invention includes an upper cover plate 1, a box body 2, two sets of drive components, two drive plates 3, a drive control component, a temperature sensor chip 18 and a lower cover plate 4, wherein the upper cover plate 1 is fixed to the upper end surface of the box body 2, such as by screws, and a plurality of tuning columns 5 perpendicular to the upper cover plate 1 are fixed to the upper cover plate 1 (the tuning columns are fixed to the upper cover plate and cannot move). A plurality of resonant cavities 6 are arranged at the upper end of the box body 2, and the tuning columns 5 on the upper cover plate 1 extend vertically into the resonant cavity 6, and one tuning column 5 corresponds to one resonant cavity 6, and generally the tuning column 5 is located at the axial center position of the resonant cavity 6. In addition, a socket mounting portion 7 is also arranged on the side of the upper end surface of the box body 2.

[0031] Two sets of the above-mentioned drive components are installed at the lower end of the box body 2, and the two sets of drive components are symmetrical along the X-axis of the box body. In this embodiment, the drive component includes a motor 8, a rotating shaft 9 and a drive ring 10. The motor 8 is fixed at the lower end of the box body 2, the rotating shaft 9 is connected to the motor 8, and the drive ring 10 is movably sleeved on the rotating shaft 9. The motor 8 drives the rotating shaft 9 to rotate, and the rotation of the rotating shaft 9 drives the drive ring 10 to move left and right along the X-axis.

[0032] The driving plate 3 is connected to the driving assembly, and it moves left and right along the X-axis synchronously with the driving ring 10 under the drive of the driving assembly. In this embodiment, the driving plate 3 is installed on the lower end surface of the box body 2 and is accommodated in the box body 2. Corresponding to the above-mentioned two groups of driving assemblies, two driving plates 3 are installed in the box body 2, and one group of driving assemblies is electrically connected to one driving plate 3 through a cable, that is, one motor 8 drives one driving plate 3. In this embodiment, a motor receiving hole 11 for the driving assembly to pass through is opened on the driving plate 3. When the driving plate 3 is installed to the lower end of the box body 2, the driving assembly installed at the lower end passes through the motor receiving hole 11.

[0033] like Figure 4 As shown, a connecting portion 12 located on the motor accommodating hole 11 is further extended from the driving plate 3 , and the connecting portion 12 is connected to the motor shaft 9 , thereby realizing the connection between the driving plate 3 and the motor 8 .

[0034] A plurality of coupling rods 13 are fixed on the driving plate 3, and a through hole 14 is provided in the box body 2, which passes through the upper and lower ends thereof. One through hole 14 corresponds to one coupling rod 13. After the driving plate 3 is installed in the box body 2, the coupling rod 13 extends from the lower end to the upper end of the box body 2, and after extending to the upper end, its front end is close to the side end of the resonant cavity 6 in the initial state. The coupling rod 13 can also be directly integrally formed with the driving plate 3, as long as the two are fixedly connected.

[0035] Different from the existing tuning rod structure, combined with Figure 7 and Figure 8As shown, the coupling rod 13 of the present invention includes a low-loss support rod 131 and metal particles 132. One end of the support rod 131 is fixed to the driving plate 3, and the other end is fixed to the metal particles 132. The metal particles 132 can be partially accommodated in the end of the support rod 131, such as the end of the support rod 131 is provided with a receiving hole 134 for accommodating the metal particles 132; it can also be directly fixed to the end of the support rod 131, as long as the support rod 131 supports the metal particles 132 to move.

[0036] Preferably, in order to enhance the holding stability between the support rod 131 and the metal particles 132, grooves 133 are provided at the rear end and both sides of the metal particles 132. When the support rod 131 is formed, a part of the support rod 131 is formed in the above grooves 133, so that the support rod 131 and the metal particles 132 are stably held. The coupling rod 13 of the present invention is formed by using a low-loss medium to support the metal particles, which can effectively reduce the reduction in the Q value of the waveguide resonant cavity. In addition, since the metal particles are small in size, they can be fine-tuned during tuning, so that the accuracy requirements during tuning are reduced, and the reduction in metal materials reduces the cost of the product.

[0037] In this embodiment, the support rod 131 is in an L-shaped structure bent toward the resonant cavity 6 .

[0038] Combination Figure 5 and Fig. 9 As shown, the drive control component is connected to the drive component and is used to control the operation of the drive component. In this embodiment, the control component includes a socket 15, a first circuit board 16 and a second circuit board 17, wherein the socket 15 is mounted on the first circuit board 16. After the two are assembled, the first circuit board 16 is mounted on the above-mentioned socket mounting portion 7 of the box body 2, and the first circuit board 16 is electrically connected to the second circuit board 17 through a cable; the second circuit board 17 is installed in the box body 2 and is located between the drive board 3 and the lower cover plate 4, and the second circuit board 17 is electrically connected to the drive component through a cable.

[0039] The temperature sensor chip 18 is arranged in the housing 2 and connected to the drive control component, and is used to monitor the temperature of the waveguide filter when it is working, and report the temperature to the drive control component in real time. In this embodiment, the temperature sensor chip 18 is arranged on the second circuit board 17, and both the temperature sensor chip 18 and the second circuit board 17 are installed in the housing 2. When the waveguide filter is working, the temperature sensor chip 18 monitors the temperature when it is working, and reports the temperature to the second circuit board 17 in real time. The second circuit board 17 calculates the temperature change value of the waveguide filter, and the second circuit board 117 sends an instruction to the control motor 8 according to the temperature change value, and the control motor 8 starts to work, and the motor 8 drives the rotating shaft 9 to rotate, and the rotating shaft 9 drives the driving ring 10 to move left and right. The driving plate 3 moves synchronously as a whole under the drive of the driving ring 10, thereby driving the coupling rod 13 to gradually extend from the side end of the resonant cavity 6 into the resonant cavity 6. As the coupling rod 13 moves, the coupling rod 13 is coupled with the corresponding resonant cavity 6 and the tuning column 5, and the resonant frequency is adjusted, and the frequency is compensated and corrected, so that the filter always works at a frequency that meets the requirements. In this embodiment, the further the metal particles 132 move into the resonance cavity 6, the smaller the resonance frequency; conversely, the further the metal particles 132 move away from the resonance cavity 6, the larger the resonance frequency. In addition, the first circuit board 16 and the second circuit board 17 are PCB control boards, and the temperature sensor chip 18 is a temperature monitoring IC chip.

[0040] The lower cover plate 4 is fixed on the lower end surface of the box body 2 , such as by screws, and together with the upper cover plate 1 , the other components of the present invention are encapsulated in the box body 2 .

[0041] like Fig. 9 As shown, the present invention is based on a temperature adaptive waveguide filter disclosed in the above embodiment, and also discloses a tuning method of the temperature adaptive waveguide filter, including: the temperature sensor chip 18 monitors the temperature of the waveguide filter when it is working, and reports the monitored temperature to the drive control component in real time; the drive control component calculates the temperature change value of the waveguide filter, and controls the drive component to drive the tuning structure to correct the frequency in the resonant cavity 6 according to the temperature change value.

[0042] Specifically, in this embodiment, when the waveguide filter is working, the temperature sensor chip 18 monitors the temperature during operation and reports the temperature to the second circuit board 17 in real time. The second circuit board 17 calculates the temperature change value of the waveguide filter. The second circuit board 117 sends instructions to the control motor 8 according to the temperature change value. The control motor 8 starts to work, and the motor 8 drives the rotating shaft 9 to rotate. The rotating shaft 9 drives the driving ring 10 to move left and right. The driving plate 3 moves synchronously as a whole under the drive of the driving ring 10, thereby driving the coupling rod 13 to gradually extend from the side end of the resonant cavity 6 into the resonant cavity 6. As the coupling rod 13 moves, the coupling rod 13 is coupled with the corresponding resonant cavity 6 and the tuning column 5, and the resonant frequency is adjusted. The frequency is compensated and corrected, so that the filter always works at a frequency that meets the requirements. In this embodiment, when the metal particles 132 move further into the resonant cavity 6, the resonant frequency is smaller; on the contrary, the further away from the resonant cavity 6, the greater the resonant frequency.

[0043] When the frequency adjustment reaches a desired value, the coupling rod 13 stops moving. Specifically, the socket 15 sends a stop command to the first circuit board 16, and the first circuit board 16 transmits the stop command to the second circuit board 17. After receiving the stop command, the second circuit board 17 controls the motor 8 to stop working, and then controls the driving board 3 to stop moving, and the coupling rod 13 also stops moving.

[0044] The present invention adopts this temperature adaptive design method, and it is no longer necessary to consider the influence of temperature drift on the filter operating frequency in the design, so there is no need to increase the number of filter stages, thereby greatly reducing the cost and having broad application prospects.

[0045] The technical contents and technical features of the present invention have been disclosed as above. However, those skilled in the art may still make various substitutions and modifications based on the teachings and disclosures of the present invention without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should not be limited to the contents disclosed in the embodiments, but should include various substitutions and modifications that do not depart from the present invention and are covered by the claims of this patent application.

Claims

1. A temperature adaptive waveguide filter, comprising a plurality of resonant cavities, a plurality of tuning posts and a tuning structure for tuning the resonant cavities, wherein one resonant cavity corresponds to one tuning structure, characterized in that: The tuning column extends into the resonant cavity from the upper end to the lower end of the resonant cavity, and one tuning column corresponds to one resonant cavity. The temperature adaptive waveguide filter also includes a driving component connected to the tuning structure, a driving control component connected to the driving component, and a temperature sensing chip connected to the driving control component. The temperature sensing chip monitors the temperature of the waveguide filter when it is working, and reports the temperature to the driving control component in real time; the driving control component calculates the temperature change value of the waveguide filter, and controls the driving component to drive the tuning structure to correct the frequency in the resonant cavity according to the temperature change value. The tuning structure includes a driving plate connected to the driving component and a plurality of coupling rods fixed on the driving plate, each coupling rod corresponds to a resonant cavity and a tuning column in the resonant cavity, and the driving plate, driven by the driving component, drives the coupling rod to extend from the side end of the resonant cavity into the resonant cavity to couple with the corresponding resonant cavity and the tuning column.

2. The temperature adaptive waveguide filter according to claim 1, characterized in that: The waveguide filter further comprises a box body and an upper cover plate fixed on the box body. A plurality of the resonant cavities are arranged in the box body. The tuning column is fixed on the upper cover plate and extends into the resonant cavity.

3. The temperature adaptive waveguide filter according to claim 2, characterized in that: The drive control component includes a socket, a first circuit board and a second circuit board, the socket is mounted on the first circuit board, the first circuit board is mounted on a box body and electrically connected to the second circuit board, the second circuit board is mounted in the box body and electrically connected to the drive component, and the temperature sensor chip is electrically connected to the second circuit board.

4. The temperature adaptive waveguide filter according to claim 3, characterized in that: The first circuit board and the second circuit board, as well as the second circuit board and the driving assembly are all electrically connected via cables, and the temperature sensor chip is disposed on the second circuit board.

5. The temperature adaptive waveguide filter according to claim 1, characterized in that: The driving assembly comprises a motor, a rotating shaft connected to the motor, and a driving ring movably sleeved on the rotating shaft, and the driving ring is connected to the driving plate.

6. The temperature adaptive waveguide filter according to claim 1, characterized in that: The coupling rod comprises a supporting rod and a metal particle. One end of the supporting rod is fixed on the driving plate, and the other end is fixed on the metal particle. The metal particle is located at the side ends of the resonant cavity and the tuning column.

7. The temperature adaptive waveguide filter according to claim 6, characterized in that: The support rod is in an L shape bent toward the resonant cavity.

8. A tuning method for the temperature adaptive waveguide filter according to claim 1, characterized in that: The tuning method comprises: the temperature sensor chip monitors the temperature of the waveguide filter when it is working, and reports the temperature to the drive control component in real time; the drive control component calculates the temperature change value of the waveguide filter, and controls the drive component to drive the tuning structure to correct the frequency in the resonant cavity according to the temperature change value.

9. The tuning method of the temperature adaptive waveguide filter according to claim 8, wherein the driving control component controls the driving component to drive the tuning structure to correct the frequency in the resonant cavity according to the temperature change value, comprising: The drive control component controls the drive component to drive the coupling rod to extend from the side end of the resonant cavity into the resonant cavity according to the temperature change value. As the coupling rod moves, the coupling rod couples with the corresponding resonant cavity and tuning column to correct the frequency in the resonant cavity.

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