Capacitance adjusting structure and filter

Abstract

The application provides a capacitance adjusting structure and a filter. The capacitance adjusting structure comprises: a shell provided with a containing cavity; a dielectric strip arranged in the containing cavity and electrically insulated from the shell, the length of the dielectric strip extending along the length direction of the containing cavity; a plurality of dielectric sheets arranged on the dielectric strip and electrically connected with the dielectric strip, the plurality of dielectric sheets being spaced apart and jointly enclosing the dielectric strip to form a tuning cavity; and an adjusting member movably arranged on the shell, the adjusting member being movable towards the direction of approaching or moving away from the tuning cavity, and the adjusting member and the dielectric strip and the adjusting member and the dielectric sheet both constituting capacitors. When the adjusting member moves towards the direction of approaching or moving away from the tuning cavity, the spacing between the adjusting member and the dielectric strip and the relative area between the adjusting member and the dielectric sheet both change. Compared with the related art in which the strength of the capacitance can only be adjusted by changing the length of a flying rod, the adjusting range of the capacitance adjusting structure is larger and the frequency adjustment is more sensitive.

Description

Technical Field

[0001] This invention relates to the field of communication device technology, and in particular to a capacitor regulation structure and filter. Background Technology

[0002] With the rapid development of the communications industry, filters are trending towards integration and miniaturization. Customers often require the use of a straight-cavity design for RF integration in their products, necessitating the addition of transmission zeros and full-scale rejection at the low-frequency end. This requires the addition of capacitors across the cavities to achieve these requirements.

[0003] In related technologies, a flying rod capacitor in a filter is a component whose capacitance value is adjusted mechanically. Its adjustment principle is based on changing the relative position or overlapping area of ​​the capacitor plates, thereby adjusting the capacitance value. A filter includes a cavity and a flying rod disposed within the cavity. The capacitance strength can only be adjusted by changing the length of the flying rod, resulting in a small adjustment range and insensitivity to frequency regulation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a capacitor adjustment structure and filter, which aims to solve the problems of small adjustment range and insensitive frequency adjustment of the flying rod capacitor in the filter in the related art.

[0005] To solve the above-mentioned technical problems, the first aspect of the present invention provides a capacitor regulation structure, comprising:

[0006] The outer casing has a receiving cavity;

[0007] A dielectric strip is disposed within the receiving cavity and electrically insulated from the outer casing, the length of the dielectric strip extending along the length direction of the receiving cavity;

[0008] A dielectric sheet, disposed on and electrically connected to the dielectric strip, wherein multiple dielectric sheets are provided, and the multiple dielectric sheets are spaced apart and together with the dielectric strip form a tuning cavity; and...

[0009] An adjusting member is movably mounted on the housing. The adjusting member can move toward or away from the tuning cavity, and the adjusting member, the dielectric strip, and the adjusting member and the dielectric sheet all constitute a capacitor.

[0010] Optionally, two dielectric sheets are provided, and the two dielectric sheets are respectively distributed on opposite sides of the length direction of the dielectric strip.

[0011] Optionally, the bottom of the tuning cavity is recessed in a direction away from the adjusting member.

[0012] Optionally, the recess depth of the tuning cavity ranges from 0 to 50 mm.

[0013] Optionally, the medium strip includes:

[0014] The first connecting section is connected at one end to the outer casing;

[0015] The first bending segment has one end connected to the other end of the first connecting segment, and the first bending segment is bent away from the first connecting segment in a direction away from the adjusting member.

[0016] The bottom section is connected at one end to the other end of the first bent section, and the adjusting member is positioned directly opposite the bottom section;

[0017] The second bend segment, one end of which is connected to the other end of the bottom segment; and,

[0018] The second connecting section has one end connected to the other end of the second bent section and the other end connected to the outer casing. The second bent section is bent away from the adjustment member relative to the second connecting section.

[0019] The first bent section, the bottom section, the second bent section, and the dielectric sheet together form the tuning cavity.

[0020] Optionally, the dielectric sheet and the dielectric strip are connected as a single unit.

[0021] Optionally, the length of the dielectric sheet is in the range of 0-50mm, and the width of the dielectric sheet is in the range of 0-50mm.

[0022] Optionally, the capacitor regulation structure further includes:

[0023] An insulator, disposed on the housing and located within the receiving cavity; and,

[0024] A locking element is connected to the medium strip and the insulator respectively, and the locking element is used to fix the medium strip to the insulator.

[0025] Optionally, the housing includes:

[0026] The base, having the receiving cavity; and,

[0027] A cover plate is disposed on the base and covers the receiving cavity, and the adjusting member is movably assembled on the cover plate.

[0028] A second aspect of the present invention provides a filter comprising the capacitor adjustment structure as described in any one of the above descriptions.

[0029] Compared with related technologies, the capacitor adjustment structure and filter of this invention have the following advantages: When the adjustment element moves towards or away from the tuning cavity, the distance between the adjustment element and the dielectric strip, as well as the relative area between the adjustment element and the dielectric sheet, will change. Compared to related technologies where capacitor strength adjustment can only be achieved by changing the length of the fly rod, the capacitor adjustment structure has a wider adjustment range and is more sensitive to frequency adjustment. Furthermore, because multiple dielectric sheets are spaced apart, debris generated by friction during the movement of the adjustment element relative to the outer shell can be cleaned out through the gaps between the dielectric sheets after falling into the tuning cavity, thus minimizing its impact on product performance. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the filter structure provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the filter structure after removing the cover plate according to an embodiment of the present invention;

[0033] Figure 3 This is an assembly diagram of the dielectric strip and dielectric sheet provided in an embodiment of the present invention;

[0034] Figure 4 This is a simulation diagram of cross-cavity capacitance coupling in a traditional filter;

[0035] Figure 5 This is a simulation diagram of the filter cross-cavity capacitance coupling provided in an embodiment of the present invention.

[0036] In the accompanying drawings, the reference numerals denote: 1. outer casing; 11. base; 111. receiving cavity; 12. cover plate; 2. dielectric strip; 21. first connecting section; 22. first bending section; 23. bottom section; 24. second bending section; 25. second connecting section; 3. dielectric sheet; 4. adjusting element; 5. tuning cavity; 6. insulator; 7. locking element; 8. tuning group; 81. resonant column; 82. tuning rod. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," and "radial," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] Example:

[0041] Please see Figure 1 , Figure 2 and Figure 3 This invention provides a filter, including a capacitor adjustment structure. The capacitor adjustment structure includes a housing 1, a dielectric strip 2, a dielectric sheet 3, and an adjustment member 4. The housing 1 has a receiving cavity 111. The dielectric strip 2 is disposed in the receiving cavity 111 and is electrically insulated from the housing 1. The length of the dielectric strip 2 extends along the length direction of the receiving cavity 111. The dielectric sheet 3 is disposed on the dielectric strip 2 and is electrically connected to the dielectric strip 2. Multiple dielectric sheets 3 are provided, and the multiple dielectric sheets 3 are spaced apart and together with the dielectric strip 2 to form a tuning cavity 5. The adjustment member 4 is movably assembled on the housing 1. The adjustment member 4 can move towards or away from the tuning cavity 5, and the adjustment member 4 and the dielectric strip 2, as well as the adjustment member 4 and the dielectric sheet 3, all constitute a capacitor.

[0042] As the adjusting element 4 moves closer to or further away from the tuning cavity 5, the distance between the adjusting element 4 and the dielectric strip 2, as well as the relative area between the adjusting element 4 and the dielectric sheet 3, changes. Compared to related technologies where capacitor strength adjustment can only be achieved by changing the length of the fly rod, the capacitor adjustment structure offers a wider adjustment range and more sensitive frequency adjustment. Furthermore, because the multiple dielectric sheets 3 are spaced apart, debris generated by friction when the adjusting element 4 moves relative to the housing 1 falls into the tuning cavity 5. This debris can be easily cleared through the gaps between the dielectric sheets 3, minimizing its impact on the product's performance.

[0043] It should be noted that, since multiple dielectric sheets 3 are distributed at intervals and together with the dielectric strip 2 to form a tuning cavity 5, the tuning cavity 5 is a semi-enclosed cavity.

[0044] Please see Figure 1 and Figure 2 In some embodiments, the receiving cavity 111 is provided with multiple resonant cavities, and the dielectric strip 2 spans multiple resonant cavities, thereby forming a transmission zero point across the cavities; moreover, the length of the dielectric strip 2 extends along the length direction of the receiving cavity 111, which can make reasonable use of the space inside the outer shell 1 and occupy a small cavity space.

[0045] Please see Figure 2 and Figure 3 In some embodiments, two dielectric sheets 3 are provided, which are respectively distributed on opposite sides of the dielectric strip 2 along its length. In this way, the surface area of ​​the dielectric sheets 3 can be maximized within the limited space of the receiving cavity 111, and the adjusting member 4 is located between the two dielectric sheets 3 when it is located in the tuning cavity 5. This helps to increase the relative area between the adjusting member 4 and the dielectric sheets 3, so that the adjustment range of the capacitor adjustment structure is larger and the frequency adjustment is more sensitive.

[0046] In some embodiments, the number of dielectric sheets 3 is set according to actual needs, such as three, four, five, etc., and the multiple dielectric sheets 3 are distributed at intervals along the circumference. The shape of the dielectric sheets 3 can be sheet-like, arc-shaped, etc.

[0047] Please see Figure 2 and Figure 3 In some embodiments, the bottom of the tuning cavity 5 is recessed away from the adjusting member 4. Thus, the tuning cavity 5 is a concave cavity relative to the dielectric strip 2, making a portion of the dielectric strip 2 the cavity wall of the tuning cavity 5. This causes the distance and relative area between the adjusting member 4 and the dielectric strip 2 to change as the adjusting member 4 moves closer to or away from the tuning cavity 5, resulting in a wider adjustment range and more sensitive frequency adjustment of the capacitor adjustment structure. Furthermore, the concave cavity can be formed by stamping, making its fabrication relatively simple.

[0048] In some embodiments, the recess depth of the tuning cavity 5 is in the range of 0-50mm, such as 1mm, 10mm, 25mm, 30mm, 40mm, 50mm, etc., so that the distance between the adjusting member 4 and the medium strip 2 can be adjusted within a moderate range and is easy to adjust.

[0049] In some embodiments, the tuning cavity 5 can be a convex cavity relative to the dielectric strip 2, in which case the peripheral walls of the tuning cavity 5 are all composed of dielectric sheets 3.

[0050] Please see Figure 2 and Figure 3 In some embodiments, the medium strip 2 includes a first connecting segment 21, a first bent segment 22, a bottom segment 23, a second bent segment 24, and a second connecting segment 25. One end of the first connecting segment 21 is connected to the outer shell 1; one end of the first bent segment 22 is connected to the other end of the first connecting segment 21, and the first bent segment 22 is bent away from the adjusting member 4 relative to the first connecting segment 21; one end of the bottom segment 23 is connected to the other end of the first bent segment 22, and the adjusting member 4 is positioned opposite the bottom segment 23; one end of the second bent segment 24 is connected to the other end of the bottom segment 23; one end of the second connecting segment 25 is connected to the other end of the second bent segment 24, and the other end is connected to the outer shell 1, and the second bent segment 24 is bent away from the adjusting member 4 relative to the second connecting segment 25; wherein, the first bent segment 22, the bottom segment 23, the second bent segment 24, and the medium sheet 3 together form a tuning cavity 5. In this way, the medium strip 2 can be fixed to the outer shell 1, and the structure of the medium strip 2 is simple and easy to manufacture.

[0051] In some embodiments, the dielectric sheet 3 and the dielectric strip 2 are connected as a single unit. Thus, the dielectric sheet 3 and the dielectric strip 2 can be integrally formed, for example, by stamping, a simple forming method.

[0052] In some embodiments, the dielectric sheet 3 and the dielectric strip 2 can also be separately arranged, and the dielectric sheet 3 and the dielectric strip 2 can be detachably connected or fixedly connected. For example, the dielectric sheet 3 and the dielectric strip 2 can be connected by screws, or the dielectric sheet 3 and the dielectric strip 2 can be fixed by welding.

[0053] It should be noted that both the dielectric sheet 3 and the dielectric strip 2 are made of metal.

[0054] In some embodiments, the length of the dielectric sheet 3 ranges from 0 to 50 mm, such as 1 mm, 10 mm, 25 mm, 30 mm, 40 mm, 50 mm, etc.; the width of the dielectric sheet 3 ranges from 0 to 50 mm, such as 1 mm, 10 mm, 25 mm, 30 mm, 40 mm, 50 mm, etc. Thus, the relative area between the adjusting member 4 and the dielectric sheet 3 is relatively large, resulting in a large adjustment range for the capacitor adjustment structure.

[0055] Please see Figure 1 and Figure 2 In some embodiments, the capacitor adjustment structure further includes an insulator 6 and a locking member 7. The insulator 6 is disposed on the housing 1 and located within the receiving cavity 111. The locking member 7 is connected to both the dielectric strip 2 and the insulator 6, and is used to fix the dielectric strip 2 onto the insulator 6. In this way, the dielectric strip 2 is fixed within the housing 1 by the locking member 7 and the insulator 6, making the fixing method of the dielectric strip 2 relatively simple, and the dielectric strip 2 and the housing 1 are electrically insulated.

[0056] Please see Figure 1 and Figure 2 In some embodiments, there may be two insulators 6 and two locking members 7. The two ends of the dielectric strip 2 are respectively fixed to the two insulators 6 by the two locking members 7, so as to improve the firmness of the dielectric strip 2; moreover, it is beneficial to realize the dielectric strip 2 across multiple resonant cavities.

[0057] It should be noted that the insulator 6 can be an insulating post, and the locking element 7 can be a screw.

[0058] Please see Figure 1 and Figure 2 In some embodiments, the housing 1 includes a base 11 and a cover plate 12. The base 11 has a receiving cavity 111; the cover plate 12 is disposed on the base 11 and covers the receiving cavity 111, and the adjusting member 4 is movably mounted on the cover plate 12. In this way, the sealing of the housing 1 can be ensured, and the adjusting member 4 can be moved toward or away from the tuning cavity 5.

[0059] Please see Figure 1 and Figure 2 In some embodiments, the adjusting member 4 is threadedly connected to the cover plate 12, so that the adjusting member 4 can be moved toward or away from the tuning cavity 5 by rotating the adjusting member 4. The adjusting member 4 is a screw, mounted on the cover plate 12 and extending into the receiving cavity 111.

[0060] Please see Figure 1 and Figure 2 In some embodiments, the filter further includes multiple tuning groups 8 disposed within the receiving cavity 111. Each tuning group 8 forms a resonant cavity within the receiving cavity 111. Each tuning group 8 includes a resonant post 81 and a tuning rod 82. The resonant post 81 is fixed to the base 11, and the tuning rod 82 is threadedly connected to the cover. One end of the tuning rod 82 extends into the resonant post 81. Thus, when the tuning rod 82 rotates, it moves up and down, thereby adjusting the distance and relative area between the tuning rod 82 and the resonant post 81, achieving adjustment of the capacitance.

[0061] Please see Figure 4 and Figure 5 , Figure 4This is a simulation diagram of cross-cavity capacitance coupling in a traditional filter. Figure 5 This is a simulation diagram of the cross-cavity capacitance coupling of the filter provided in an embodiment of the present invention; wherein, the horizontal axis represents the F frequency range (GHz), and the vertical axis represents the absolute value of the coupling (dB). (Comparison) Figure 4 and Figure 5 As can be seen, in this embodiment of the invention, the filter adjusts the capacitance between the adjustment element 4 and the dielectric strip 2, and between the adjustment element 4 and the dielectric sheet 3, resulting in a wider capacitance adjustment range and more sensitive frequency adjustment.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A capacitor regulation structure, characterized in that, include: The outer casing has a receiving cavity; A dielectric strip is disposed within the receiving cavity and electrically insulated from the outer casing, the length of the dielectric strip extending along the length direction of the receiving cavity; A dielectric sheet is disposed on the dielectric strip and is electrically connected to the dielectric strip. Multiple dielectric sheets are provided, and the multiple dielectric sheets are distributed at intervals and together with the dielectric strip to form a tuning cavity. as well as, An adjusting member is movably mounted on the housing. The adjusting member can move toward or away from the tuning cavity, and the adjusting member, the dielectric strip, and the adjusting member and the dielectric sheet all constitute a capacitor. The medium strip includes: The first connecting section is connected at one end to the outer casing; The first bending segment has one end connected to the other end of the first connecting segment, and the first bending segment is bent away from the first connecting segment in a direction away from the adjusting member. The bottom section is connected at one end to the other end of the first bent section, and the adjusting member is positioned directly opposite the bottom section; The second bend segment, one end of which is connected to the other end of the bottom segment; and, The second connecting section has one end connected to the other end of the second bent section and the other end connected to the outer casing. The second bent section is bent away from the adjustment member relative to the second connecting section. The first bent section, the bottom section, the second bent section, and the dielectric sheet together form the tuning cavity.

2. The capacitor regulation structure according to claim 1, characterized in that, The medium sheet is provided in two parts, and the two medium sheets are respectively distributed on opposite sides of the length direction of the medium strip.

3. The capacitor regulation structure according to claim 1, characterized in that, The bottom of the tuning cavity is recessed in a direction away from the adjustment member.

4. The capacitor adjustment structure according to claim 3, characterized in that, The depth of the tuning cavity ranges from 0 to 50 mm.

5. The capacitor regulation structure according to claim 1, characterized in that, The dielectric sheet and the dielectric strip are connected as one unit.

6. The capacitor adjustment structure according to claim 1, characterized in that, The length of the dielectric sheet is in the range of 0-50mm, and the width of the dielectric sheet is in the range of 0-50mm.

7. The capacitor regulation structure according to claim 1, characterized in that, The capacitor regulation structure further includes: An insulator, disposed on the housing and located within the receiving cavity; and, A locking element is connected to the medium strip and the insulator respectively, and the locking element is used to fix the medium strip to the insulator.

8. The capacitor regulation structure according to claim 1, characterized in that, The outer casing includes: The base, having the receiving cavity; and, A cover plate is disposed on the base and covers the receiving cavity, and the adjusting member is movably assembled on the cover plate.

9. A filter, characterized in that, Includes the capacitor regulation structure as described in any one of claims 1-8.

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