Capacitance adjusting structure and filter
The capacitance adjustment structure composed of dielectric strips and dielectric sheets solves the problems of small adjustment range of flying rod capacitance and insensitive frequency adjustment in the filter, achieves a larger adjustment range and more sensitive frequency adjustment, and meets the needs of RF integrated products.
Patent Information
- Application Number
- CN202510631678.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-15
- Publication Date
- 2025-09-26
AI Technical Summary
The adjustment range of the flying rod capacitor in the filter is small and the frequency adjustment is insensitive, which makes it difficult to meet customers' demand for RF integrated products.
The capacitance adjustment structure consists of dielectric strips and dielectric sheets. By moving the adjustment member between the dielectric strips and the dielectric sheet, the spacing and relative area are changed to adjust the capacitance value. Combined with the spacing distribution and concave design of the dielectric sheet, the adjustment range and frequency adjustment sensitivity are increased.
It achieves a wider capacitance adjustment range, more sensitive frequency adjustment, and easy debris cleaning without affecting product performance, meeting the needs of RF integrated products.
Smart Images
Figure CN120709693A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of communication devices, and in particular to a capacitance adjustment structure and a filter. Background Art
[0002] With the rapid development of the communications industry, filters are trending towards integration and miniaturization. Customers often require the use of a direct-discharge cavity for RF integration. This requires adding a transmission zero at the low end of the frequency range to achieve full suppression, which requires adding capacitors across the cavity.
[0003] In related art, the flying rod capacitor in a filter is a component whose capacitance is mechanically adjusted by varying the relative position or overlapping area of the capacitor plates. The filter consists of a cavity and a flying rod positioned within it. Capacitance adjustment can only be achieved by changing the rod's length, resulting in a narrow adjustment range and insensitive frequency control. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to provide a capacitance adjustment structure and a filter, aiming to solve the problem in the related art that the adjustment range of the flying rod capacitor in the filter is small and the frequency adjustment is insensitive.
[0005] To solve the above technical problems, the present invention provides a capacitance adjustment structure in a first aspect, comprising:
[0006] A housing having a receiving cavity;
[0007] a dielectric strip, disposed in the accommodating cavity and electrically insulated from the housing, wherein the dielectric strip extends along the length direction of the accommodating cavity;
[0008] a dielectric sheet, disposed on the dielectric strip and electrically connected to the dielectric strip, wherein a plurality of dielectric sheets are provided, the plurality of dielectric sheets are spaced apart and enclose the dielectric strip together to form a tuning cavity; and
[0009] An adjusting member is movably assembled on the housing. The adjusting member can move toward or away from the tuning cavity. The adjusting member and the dielectric strip, as well as the adjusting member and the dielectric sheet, all constitute capacitors.
[0010] Optionally, two dielectric sheets are provided, and the two dielectric sheets are respectively distributed on two opposite sides in 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 depression depth of the tuning cavity ranges from 0 to 50 mm.
[0013] Optionally, the dielectric strip includes:
[0014] a first connecting section, one end of which is connected to the housing;
[0015] a first bending section, one end of which is connected to the other end of the first connecting section, and the first bending section is bent relative to the first connecting section in a direction away from the adjusting member;
[0016] A bottom section, one end of which is connected to the other end of the first bending section, and the adjusting member is arranged opposite to the bottom section;
[0017] A second bending section, one end of which is connected to the other end of the bottom section; and
[0018] a second connecting section, one end of which is connected to the other end of the second bending section and the other end of which is connected to the housing, wherein the second bending section is bent relative to the second connecting section in a direction away from the adjusting member;
[0019] The first bending section, the bottom section, the second bending section and the dielectric sheet together enclose the tuning cavity.
[0020] Optionally, the dielectric sheet and the dielectric strip are connected into one body.
[0021] Optionally, the length of the dielectric sheet ranges from 0 to 50 mm, and the width of the dielectric sheet ranges from 0 to 50 mm.
[0022] Optionally, the capacitance adjustment structure further includes:
[0023] an insulator, disposed on the housing and located in the accommodating cavity; and
[0024] A locking member is connected to the dielectric strip and the insulator respectively, and the locking member is used to fix the dielectric strip on the insulator.
[0025] Optionally, the housing comprises:
[0026] a base, provided with the accommodating cavity; and
[0027] A cover plate is arranged on the base and covers the accommodating 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 capacitance adjustment structure as described above.
[0029] Compared to related technologies, the capacitor adjustment structure and filter disclosed herein offer the following advantages: as the adjustment member moves toward or away from the tuning cavity, the spacing between the adjustment member and the dielectric strip, as well as the relative area between the adjustment member and the dielectric sheet, changes. This allows for a wider adjustment range and more sensitive frequency adjustment, compared to related technologies where capacitance adjustment can be achieved solely by changing the length of the flybar. Furthermore, because the multiple dielectric sheets are spaced apart, debris generated by friction during the relative movement of the adjustment member relative to the housing that falls into the tuning cavity can be removed through the gaps between the sheets, minimizing the impact on product performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. 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 work.
[0031] Figure 1 is a schematic structural diagram of a filter provided by an embodiment of the present invention;
[0032] Figure 2 1 is a schematic structural diagram of a filter provided by an embodiment of the present invention with the cover plate removed;
[0033] Figure 3 1 is a schematic diagram of the assembly of a dielectric strip and a dielectric sheet provided by an embodiment of the present invention;
[0034] Figure 4 This is a simulation diagram of cross-cavity capacitance coupling of a traditional filter;
[0035] Figure 5 This is a simulation diagram of the cross-cavity capacitance coupling of the filter provided by an embodiment of the present invention.
[0036] In the accompanying drawings, the various reference numerals represent: 1. outer shell; 11. base; 111. accommodating 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 member; 5. tuning cavity; 6. insulator; 7. locking member; 8. tuning group; 81. resonant column; 82. tuning rod. DETAILED DESCRIPTION
[0037] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present 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 the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.
[0040] Example:
[0041] See also Figure 1 、 Figure 2 and Figure 3 An embodiment of the present invention provides a filter, including a capacitance adjustment structure, which includes a housing 1, a dielectric strip 2, a dielectric sheet 3, and an adjustment member 4. The housing 1 is provided with a housing cavity 111; the dielectric strip 2 is disposed in the housing cavity 111 and is electrically insulated from the housing 1, and the length of the dielectric strip 2 extends along the length direction of the housing cavity 111; the dielectric sheet 3 is disposed on the dielectric strip 2 and is electrically conductive with the dielectric strip 2, and a plurality of dielectric sheets 3 are provided. The plurality of dielectric sheets 3 are spaced apart and enclosed together with the dielectric strip 2 to form a tuning cavity 5; the adjustment member 4 is movably assembled on the housing 1, and the adjustment member 4 can move toward 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 capacitors.
[0042] As the adjusting member 4 moves toward or away from the tuning cavity 5, the spacing between the adjusting member 4 and the dielectric strip 2, as well as the relative area between the adjusting member 4 and the dielectric sheet 3, changes. This allows for a wider adjustment range and more sensitive frequency adjustment compared to related art methods where capacitance adjustment can only be achieved by changing the length of the flybar. Furthermore, because the multiple dielectric sheets 3 are spaced apart, debris generated by friction during the relative movement of the adjusting member 4 relative to the housing 1 and falling into the tuning cavity 5 can be removed through the gaps between the sheets, minimizing the impact on product performance.
[0043] It should be noted that, since the plurality of dielectric sheets 3 are distributed at intervals and enclose together with the dielectric strip 2 to form the tuning cavity 5 , the tuning cavity 5 is a semi-enclosed cavity.
[0044] See also Figure 1 and Figure 2 In some embodiments, a plurality of resonant cavities are provided in the accommodating cavity 111, and the dielectric strip 2 spans across the plurality of 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 accommodating cavity 111, which can reasonably utilize the space in the housing 1 and occupy a small cavity space.
[0045] See also Figure 2 and Figure 3 In some embodiments, two dielectric sheets 3 are provided, one on each side of the dielectric strip 2 in the longitudinal direction. This maximizes the surface area of the dielectric sheet 3 within the limited space of the accommodating cavity 111. Furthermore, when the adjusting member 4 is located within the tuning cavity 5, it is positioned between the two dielectric sheets 3. This increases the relative area between the adjusting member 4 and the dielectric sheet 3, broadening the capacitance adjustment range and enhancing frequency sensitivity.
[0046] In some embodiments, the number of dielectric sheets 3 is set according to actual needs, such as three, four, five, etc., and the dielectric sheets 3 are spaced apart along the circumference. The dielectric sheets 3 can be in the shape of a sheet, an arc, etc.
[0047] See also Figure 2 and Figure 3 In some embodiments, the bottom of the tuning cavity 5 is recessed away from the adjustment member 4. This creates a concave cavity relative to the dielectric strip 2, with portions of the dielectric strip 2 serving as the cavity wall of the tuning cavity 5. Consequently, as the adjustment member 4 moves toward or away from the tuning cavity 5, the spacing and relative area between the adjustment member 4 and the dielectric strip 2 change, resulting in a wider adjustment range and more sensitive frequency adjustment for the capacitance adjustment structure. Furthermore, the concave cavity can be formed by stamping, making its fabrication relatively simple.
[0048] In some embodiments, the depression depth of the tuning cavity 5 ranges from 0 to 50 mm, such as 1 mm, 10 mm, 25 mm, 30 mm, 40 mm, 50 mm, etc., so that the distance between the adjusting member 4 and the dielectric strip 2 can be adjusted in a moderate range and is easy to adjust.
[0049] In some embodiments, the tuning cavity 5 may be a convex cavity relative to the dielectric strip 2 . In this case, the peripheral walls of the tuning cavity 5 are all formed by the dielectric sheet 3 .
[0050] See also Figure 2 and Figure 3 In some embodiments, the dielectric strip 2 includes a first connecting section 21, a first bent section 22, a bottom section 23, a second bent section 24, and a second connecting section 25. One end of the first connecting section 21 is connected to the housing 1; one end of the first bent section 22 is connected to the other end of the first connecting section 21, and the first bent section 22 is bent relative to the first connecting section 21 in a direction away from the adjusting member 4; one end of the bottom section 23 is connected to the other end of the first bent section 22, and the adjusting member 4 is disposed opposite the bottom section 23; one end of the second bent section 24 is connected to the other end of the bottom section 23; one end of the second connecting section 25 is connected to the other end of the second bent section 24 and the other end is connected to the housing 1, and the second bent section 24 is bent relative to the second connecting section 25 in a direction away from the adjusting member 4. The first bent section 22, the bottom section 23, the second bent section 24, and the dielectric sheet 3 collectively enclose a tuning cavity 5. In this manner, the dielectric strip 2 can be fixed to the housing 1, and the dielectric strip 2 has a simple structure, making it easy to prepare and form.
[0051] In some embodiments, the dielectric sheet 3 and the dielectric strip 2 are connected as one body, so that the dielectric sheet 3 and the dielectric strip 2 can be integrally formed, for example, by stamping, which is a simple forming method.
[0052] In some embodiments, the dielectric sheet 3 and the dielectric strip 2 can also be set separately, 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 are connected by screws, or the dielectric sheet 3 and the dielectric strip 2 are fixed by welding.
[0053] It should be noted that the dielectric sheet 3 and the dielectric strip 2 are both made of metal materials.
[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, and 50 mm; 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, and 50 mm. Thus, the relative area between the adjustment member 4 and the dielectric sheet 3 is larger, thereby increasing the adjustment range of the capacitance adjustment structure.
[0055] See also Figure 1 and Figure 2 In some embodiments, the capacitance 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 accommodating cavity 111. The locking member 7 is connected to the dielectric strip 2 and the insulator 6, respectively, and is used to secure the dielectric strip 2 to the insulator 6. Thus, the dielectric strip 2 is secured within the housing 1 via the locking member 7 and the insulator 6, making the securing method for the dielectric strip 2 relatively simple and providing electrical insulation between the dielectric strip 2 and the housing 1.
[0056] See also Figure 1 and Figure 2 In some embodiments, two insulators 6 and two locking members 7 may be provided, and the two ends of the dielectric strip 2 are fixed to the two insulators 6 by two locking members 7 respectively, so as to improve the firmness of the fixation of the dielectric strip 2; moreover, it is conducive to realizing that the dielectric strip 2 spans multiple resonant cavities.
[0057] It should be noted that the insulator 6 may be an insulating column, and the locking member 7 may be a screw.
[0058] See also Figure 1 and Figure 2 In some embodiments, the housing 1 includes a base 11 and a cover 12. The base 11 defines a receiving cavity 111. The cover 12 is disposed on the base 11 and covers the receiving cavity 111. The adjustment member 4 is movably mounted on the cover 12. This ensures the sealing of the housing 1 and allows the adjustment member 4 to move toward or away from the tuning cavity 5.
[0059] See also Figure 1 and Figure 2 In some embodiments, the adjusting member 4 is threadedly connected to the cover 12, so that the adjusting member 4 can be rotated to move toward or away from the tuning cavity 5. The adjusting member 4 is a screw, which is assembled on the cover 12 and extends into the accommodating cavity 111.
[0060] See also Figure 1 and Figure 2 In some embodiments, the filter further includes a plurality of tuning groups 8 disposed within the accommodating cavity 111. Each tuning group 8 forms a resonant cavity within the accommodating cavity 111. The tuning group 8 includes a resonant column 81 and a tuning rod 82. The resonant column 81 is fixed to the base 11. The tuning rod 82 is threadedly connected to the cover, and one end of the tuning rod 82 extends into the resonant column 81. Thus, when the tuning rod 82 rotates, the tuning rod 82 moves up and down, thereby adjusting the distance and relative area between the tuning rod 82 and the resonant column 81, thereby adjusting the capacitance.
[0061] See also Figure 4 and Figure 5 , Figure 4This is a simulation diagram of the cross-cavity capacitance coupling of a traditional filter. Figure 5 This is a simulation diagram of the cross-cavity capacitance coupling of the filter provided by the embodiment of the present invention; wherein the horizontal axis is the F frequency range (GHz), and the vertical axis is the absolute value of the coupling (dB). Figure 4 and Figure 5 It can be seen that in the embodiment of the present invention, the filter has a wider capacitance adjustment range and more sensitive frequency adjustment by adjusting the capacitance between the adjusting member 4 and the dielectric strip 2, and between the adjusting member 4 and the dielectric sheet 3.
[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 in the scope of protection of the present invention.
Claims
1. A capacitance adjustment structure, characterized in that: include: A housing having a receiving cavity; a dielectric strip, disposed in the accommodating cavity and electrically insulated from the housing, wherein the dielectric strip extends along the length direction of the accommodating cavity; a dielectric sheet, disposed on the dielectric strip and electrically connected to the dielectric strip, wherein a plurality of dielectric sheets are provided, the plurality of dielectric sheets are spaced apart and enclose the dielectric strip together to form a tuning cavity; as well as, An adjusting member is movably assembled on the housing. The adjusting member can move toward or away from the tuning cavity. The adjusting member and the dielectric strip, as well as the adjusting member and the dielectric sheet, all constitute capacitors.
2. The capacitance adjustment structure according to claim 1, wherein: There are two dielectric sheets, and the two dielectric sheets are respectively distributed on two opposite sides in the length direction of the dielectric strip.
3. The capacitance adjustment structure according to claim 1, wherein: The bottom of the tuning cavity is recessed in a direction away from the adjusting member.
4. The capacitance adjustment structure according to claim 3, characterized in that: The depression depth of the tuning cavity ranges from 0 to 50 mm.
5. The capacitance adjustment structure according to claim 3, characterized in that: The dielectric strip comprises: a first connecting section, one end of which is connected to the housing; a first bending section, one end of which is connected to the other end of the first connecting section, and the first bending section is bent relative to the first connecting section in a direction away from the adjusting member; A bottom section, one end of which is connected to the other end of the first bending section, and the adjusting member is arranged opposite to the bottom section; A second bending section, one end of which is connected to the other end of the bottom section; and a second connecting section, one end of which is connected to the other end of the second bending section and the other end of which is connected to the housing, wherein the second bending section is bent relative to the second connecting section in a direction away from the adjusting member; The first bending section, the bottom section, the second bending section and the dielectric sheet together enclose the tuning cavity.
6. The capacitance adjustment structure according to claim 1, wherein: The dielectric sheet and the dielectric strip are connected into one body.
7. The capacitance adjustment structure according to claim 1, wherein: The length of the dielectric sheet ranges from 0 to 50 mm, and the width of the dielectric sheet ranges from 0 to 50 mm.
8. The capacitance adjustment structure according to claim 1, wherein: The capacitance adjustment structure further includes: an insulator, disposed on the housing and located in the accommodating cavity; and A locking member is connected to the dielectric strip and the insulator respectively, and the locking member is used to fix the dielectric strip on the insulator.
9. The capacitance adjustment structure according to claim 1, wherein: The housing comprises: a base, provided with the accommodating cavity; and A cover plate is arranged on the base and covers the accommodating cavity, and the adjusting member is movably assembled on the cover plate.
10. A filter, characterized in that: The method comprises the capacitance adjustment structure according to any one of claims 1 to 9.