A TM mode dielectric filter

Abstract

The present invention provides a TM mode dielectric filter, comprising a cavity with an open end, a dielectric resonator located within the cavity, and a cover plate mounted to the open end of the cavity. The cover plate includes a pressing portion, a deforming portion, and a peripheral mounting portion. The deforming portion and the pressing portion are configured to contact the dielectric resonator. The peripheral mounting portion surrounds the pressing portion and is configured to mount the cover plate to the open end of the cavity. The deforming portion is connected between the pressing portion and the peripheral mounting portion and can deform to allow the pressing portion to move closer to or further from the bottom of the cavity. The TM mode dielectric filter also includes a pressure block mounted to the pressing portion or the deforming portion to apply pressure to the pressing portion or the deforming portion. The present invention ensures high Q value, high intermodulation, and other performance of the TM mode dielectric filter.

Description

Technical field

[0001] The present invention relates to the field of radio frequency communications, and in particular to a TM (transverse magnetic) mode dielectric filter. [Background Technology]

[0002] TM mode dielectric filters are transceiver filters, key components of the RF front-end of mobile base stations. Their performance directly affects the quality of communication. With the development of mobile communication networks and the approach of 5G technology, dielectric filters have the characteristics of miniaturization and high Q value and are widely used in 5G technology.

[0003] In existing TM mode dielectric filters, the top and bottom surfaces of the dielectric resonator generally cannot achieve good contact with the cover plate and the bottom of the cavity, thereby affecting the Q value and intermodulation of the filter. [Summary of the invention]

[0004] The main purpose of the present invention is to provide a TM mode dielectric filter, which ensures the high Q value, high intermodulation and other performances of the TM mode dielectric filter.

[0005] To achieve the above-mentioned objectives, the technical solution provided by the present invention is to provide a TM mode dielectric filter, comprising a cavity having an open end, a dielectric resonator located in the cavity, and a cover plate mounted to the open end of the cavity, wherein the cover plate comprises a pressing portion, a deforming portion, and a peripheral mounting portion, wherein the deforming portion and the pressing portion are used to contact the dielectric resonator, the peripheral mounting portion surrounds the pressing portion, and is used to mount the cover plate to the open end of the cavity, the deforming portion is connected between the pressing portion and the peripheral mounting portion, and the deforming portion can be deformed to allow the pressing portion to approach or move away from the bottom of the cavity; the TM mode dielectric filter also includes a pressure block, which is mounted to the pressing portion or the deforming portion to apply pressure to the pressing portion or the deforming portion.

[0006] As a preferred technical solution, a recessed area is provided on the top surface of the cover plate to form the deformation portion, and the pressing portion is located in the recessed area.

[0007] As a preferred technical solution, it also includes an elastic member, one end of which is installed on the compression part or the deformation part, and the other end supports the pressure block so as to be compressed by the pressure block, and the pressure block is at least partially accommodated in the recessed area.

[0008] As a preferred technical solution, the elastic member is sleeved onto the outer periphery of the compression portion, and the bottom surface of the pressure block is provided with a receiving cavity at a position corresponding to the compression portion. The elastic member is compressed between the bottom of the receiving cavity and the bottom of the recessed area so that the two ends of the elastic member are respectively pressed against the bottom of the receiving cavity and the bottom of the recessed area, thereby making the deformation portion and the compression portion tightly pressed against the top surface of the dielectric resonator, and making the bottom surface of the dielectric resonator tightly pressed against the bottom of the cavity under the pressure of the deformation portion and the compression portion.

[0009] As a preferred technical solution, there is a gap between the bottom surface of the pressure block and the bottom of the recessed area.

[0010] As a preferred technical solution, the pressure block is installed in the recessed area through threads or screws.

[0011] As a preferred technical solution, a tool positioning hole is provided on the top surface of the pressure block.

[0012] As a preferred technical solution, the elastic member is a spring, and the cross-sectional shape of the spring is circular or rectangular.

[0013] As a preferred technical solution, the thickness of the deformation portion is 0.4-0.6 mm.

[0014] As a preferred technical solution, it also includes a screw and a nut, the pressure block and the compression part respectively have a first mounting hole and a second mounting hole, the nut is located in the first mounting hole, the screw is installed in the second mounting hole, and one end of the screw extends from the top end of the second mounting hole and is installed on the nut, and the other end extends from the bottom end of the second mounting hole and extends into the cavity of the dielectric resonator.

[0015] The TM mode dielectric filter provided by the present invention applies pressure to the deformation portion or the pressing portion through a pressure block, so that the deformation portion and the pressing portion can be tightly pressed against the top surface of the dielectric resonator, and the bottom surface of the dielectric resonator can be tightly pressed against the bottom of the cavity, so that both the top surface and the bottom surface of the dielectric resonator can achieve good contact, ensuring the reliability of the contact between the top surface and the bottom surface of the dielectric resonator, and ensuring the high Q value, high intermodulation and other performance of the TM mode dielectric filter.

Brief Description of the Drawings

[0016] To further explain the specific technical content of this case, please first refer to the attached drawings, in which:

[0017] Figure 1 A schematic structural diagram of a TM mode dielectric filter provided by one embodiment of the present invention;

[0018] Figure 2 for Figure 1Schematic diagram of the exploded view of the TM mode dielectric filter shown;

[0019] Figure 3 for Figure 1 A schematic cross-sectional view of the TM mode dielectric filter shown;

[0020] Figure 4 for Figure 1 A schematic structural diagram of a cover plate of the TM mode dielectric filter shown;

[0021] Figure 5 for Figure 4 A schematic cross-sectional view of the cover plate shown;

[0022] Figure 6 for Figure 1 A schematic structural diagram of a solution of an elastic member of a TM mode dielectric filter is shown;

[0023] Figure 7 for Figure 1 FIG. 1 is a schematic structural diagram of another embodiment of the elastic member of the TM mode dielectric filter.

[0024] Explanation of symbols:

[0025] Cavity 10 Boss 11

[0026] Dielectric resonator 20 Cavity 21

[0027] Cover plate 30 Pressing portion 31

[0028] Second mounting hole 311

[0029] Deformation portion 32 Peripheral mounting portion 33

[0030] Depression area 34

[0031] Pressure block 40 Receiving cavity 41

[0032] Gap 42 First mounting hole 43

[0033] Tooling positioning hole 44

[0034] Elastic member 50

[0035] Screw 60

[0036] Nut 70 [Specific implementation method]

[0037] See also Figures 1 to 5 This embodiment provides a TM mode dielectric filter, including a cavity 10 with an open end, a dielectric resonator 20 located in the cavity 10, a cover plate 30 mounted to the open end of the cavity 10, and a pressure block 40.

[0038] The dielectric resonator 20 is a hollow structure having a cavity 21 extending along its axial direction.

[0039] The cover plate 30 includes a pressing portion 31, a deforming portion 32 and a peripheral mounting portion 33. The deforming portion 32 and the pressing portion 31 are used to contact the top surface of the dielectric resonator 20. The peripheral mounting portion 33 surrounds the pressing portion 31 and is used to mount the cover plate 30 to the open end of the cavity 10. The peripheral mounting portion 33 mounts the cover plate 30 to the open end of the cavity 10 by fasteners such as screws. The deforming portion 32 is connected between the pressing portion 31 and the peripheral mounting portion 33. The deforming portion 32 can be deformed to allow the pressing portion 31 to move closer to or further away from the bottom of the cavity 10. Preferably, the top surface of the cover plate 30 is provided with a recessed area 34 (see FIG. 34 ) at a position corresponding to the dielectric resonator 20. Figure 5 ) to form the deformation portion 32 , and the pressing portion 31 is located in the recessed area 34 .

[0040] The pressure block 40 is mounted on the compression portion 31 or the deformation portion 32 to apply pressure to the compression portion 31 or the deformation portion 32, so that the compression portion 31 and the deformation portion 32 are tightly pressed against the top surface of the dielectric resonator 20, and the bottom surface of the dielectric resonator 20 is tightly pressed against the bottom of the cavity 10 under the pressure of the deformation portion 32 and the compression portion 31, so that both the top and bottom surfaces of the dielectric resonator 20 can achieve good contact. When the pressure block 40 applies pressure to the compression portion 31, the compression portion 31 can drive the deformation portion 32 to deform, so that both can be tightly pressed against the top surface of the dielectric resonator 20. When the pressure block 40 applies pressure to the deformation portion 32, the deformation portion 32 is deformed, thereby driving the compression portion 31 close to the bottom of the cavity 10, so that both can be tightly pressed against the top surface of the dielectric resonator 20.

[0041] Preferably, the TM mode dielectric filter of the present invention further includes an elastic member 50. One end of the elastic member 50 is mounted to the compression portion 31 or the deformable portion 32, and the other end of the elastic member 50 supports the pressure block 40 so as to be compressed by the pressure block 40. The pressure block 40 is at least partially accommodated in the recessed area 34. The pressure block 40 is mounted to the compression portion 31 or the deformable portion 32 via the elastic member 50 to apply pressure to the compression portion 31 or the deformable portion 32.

[0042] The elastic member 50 is sleeved onto the outer periphery of the pressing portion 31. The bottom surface of the pressure block 40 is provided with a receiving cavity 41 at a position corresponding to the pressing portion 31. The elastic member 50 is compressed between the bottom of the receiving cavity 41 and the bottom of the recessed area 34 so that the two ends of the elastic member 50 are pressed against the bottom of the receiving cavity 41 and the bottom of the recessed area 34, respectively. As a result, the deformable portion 32 and the pressing portion 31 are tightly pressed against the top surface of the dielectric resonator 20. Under the pressure of the deformable portion 32 and the pressing portion 31, the bottom surface of the dielectric resonator 20 is tightly pressed against the bottom of the cavity 10, so that both the top and bottom surfaces of the dielectric resonator 20 can achieve good contact.

[0043] Through the above-mentioned structure, the present invention can tightly press the top surface of the dielectric resonator 20 through the deformation portion 32 and the pressing portion 31, and can tightly press the bottom surface of the dielectric resonator 20 into the bottom of the cavity 10, thereby ensuring the reliability of the contact between the top and bottom surfaces of the dielectric resonator 20, ensuring the high Q value, high intermodulation and other performance of the TM mode dielectric filter, and simplifying assembly, facilitating production and improving production efficiency.

[0044] In this embodiment, the thickness of the deformation portion 32 is 0.4-0.6 mm, preferably 0.5 mm, which can ensure that the deformation portion 32 undergoes elastic deformation.

[0045] The top surfaces of the pressure block 40 and the pressing portion 31 respectively have a first mounting hole 43 and a second mounting hole 311. The first mounting hole 43 communicates with the receiving cavity 41, and the second mounting hole 311 communicates with the cavity 21 of the dielectric resonator 20. A nut 70 is positioned within the first mounting hole 43, and a screw 60 is mounted within the second mounting hole 311. One end of the screw 60 extends from the top of the second mounting hole 311 and is mounted to the nut 70, while the other end extends from the bottom of the second mounting hole 311 and extends into the cavity 21 of the dielectric resonator 20 to achieve tuning of the resonant frequency. The depth of the screw 60's penetration into the cavity 21 of the dielectric resonator 20 can be adjusted by the nut 70, thereby achieving tuning of the resonant frequency.

[0046] A boss 11 is formed at the bottom of the cavity 10 . The boss 11 is embedded in the cavity 21 of the dielectric resonator 20 to position and fix the dielectric resonator 20 .

[0047] In this embodiment, the pressure block 40 is threadedly installed in the recessed area 34. Specifically, the outer periphery of the pressure block 40 is provided with an external thread, and the inner wall of the recessed area 34 is provided with an internal thread, and the internal thread and the external thread cooperate with each other, so that the pressure block 40 is threadedly installed in the recessed area 34. The pressure block 40 is installed in the recessed area 34 in a threaded manner, which is convenient for disassembly and replacement of the elastic member 50, etc., and at the same time ensures that the elastic member 50 does not shake and can be pressed to the bottom of the accommodating cavity 41 and the bottom of the recessed area 34. The pressure block 40 is threaded in a manner that can also control the degree of deformation of the deformation part 32 or the compression part 31, that is, the degree of deformation will be greater if the deformation part 32 or the compression part 31 is tightened. It can be understood that the pressure block 40 can also be installed in the recessed area 34 by screws.

[0048] There is a gap 42 between the bottom surface of the pressure block 40 and the bottom of the recessed area 34 (see Figure 3 The provision of the gap 42 can make the elastic force of the elastic member 50 more stable.

[0049] The top surface of the pressure block 40 is provided with a tooling locating hole 44. The tooling locating hole 44 allows the pressure block 40 to be screwed into the recessed area 34 using auxiliary components such as tooling, saving time and effort. It also ensures that the force applied to the pressure block 40 is uniform, ensuring that the pressure applied by the elastic member 50 to the bottom of the recessed area 34 is uniform. There are generally multiple tooling locating holes 44. For example, in this embodiment, there are four tooling locating holes 44, which are evenly distributed on the top surface of the pressure block 40 along its circumference.

[0050] See also Figure 6 In this embodiment, the elastic member 50 is a spring, and the cross-section of the spring is circular. In an alternative solution, as Figure 7 As shown, the cross-sectional shape of the spring can be a rectangle. It is understandable that the cross-sectional shape of the spring can also be other.

[0051] It is understandable that the elastic member 50 may also be made of other elastic materials.

[0052] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A TM mode dielectric filter comprising a cavity having an open end, a dielectric resonator located in the cavity, and a cover plate mounted to the open end of the cavity, characterized in that: The cover plate includes a pressing portion, a deforming portion, and a peripheral mounting portion, wherein the deforming portion and the pressing portion are used to contact the dielectric resonator, the peripheral mounting portion surrounds the pressing portion, and is used to mount the cover plate to the open end of the cavity, the deforming portion is connected between the pressing portion and the peripheral mounting portion, and the deforming portion can be deformed to allow the pressing portion to approach or move away from the bottom of the cavity; The TM mode dielectric filter further includes a pressure block, which is mounted on the pressing portion or the deforming portion to apply pressure to the pressing portion or the deforming portion; The top surface of the cover plate is provided with a recessed area to form the deformation portion, and the pressing portion is located in the recessed area; the pressure block is at least partially accommodated in the recessed area; the pressure block is installed in the recessed area by a thread, and the pressure block can rotate relative to the recessed area; The TM mode dielectric filter further includes an elastic member, one end of which is mounted on the pressing portion or the deforming portion, and the other end of which supports the pressure block so as to be compressed by the pressure block.

2. The TM mode dielectric filter according to claim 1, characterized in that The outer periphery of the pressure block is provided with an external thread, the inner wall of the recessed area is provided with an internal thread, and the internal thread and the external thread are threadably matched.

3. The TM mode dielectric filter according to claim 2, characterized in that The elastic member is sleeved onto the outer periphery of the compression portion, and a receiving cavity is provided on the bottom surface of the pressure block at a position corresponding to the compression portion. The elastic member is compressed between the bottom of the receiving cavity and the bottom of the recessed area so that the two ends of the elastic member are pressed tightly against the bottom of the receiving cavity and the bottom of the recessed area, respectively, so that the deformation portion and the compression portion are tightly pressed against the top surface of the dielectric resonator, and the bottom surface of the dielectric resonator is tightly pressed against the bottom of the cavity under the pressure of the deformation portion and the compression portion.

4. The TM mode dielectric filter according to claim 1, wherein There is a gap between the bottom surface of the pressure block and the bottom of the recessed area.

5. The TM mode dielectric filter according to claim 1, wherein: A tooling positioning hole is provided on the top surface of the pressure block.

6. The TM mode dielectric filter according to claim 2, characterized in that: The elastic member is a spring, and the cross-section of the spring is circular or rectangular.

7. The TM mode dielectric filter according to claim 1, wherein: The thickness of the deformation portion is 0.4-0.6 mm.

8. The TM mode dielectric filter according to claim 1, wherein: It also includes a screw and a nut, the pressure block and the compression part respectively have a first mounting hole and a second mounting hole, the nut is located in the first mounting hole, the screw is installed in the second mounting hole, and one end of the screw extends from the top end of the second mounting hole and is installed on the nut, and the other end extends from the bottom end of the second mounting hole and extends into the cavity of the dielectric resonator.

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