CN217881834U - Tunable capacitively coupled filter - Google Patents
Tunable capacitively coupled filter Download PDFInfo
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- CN217881834U CN217881834U CN202221894877.6U CN202221894877U CN217881834U CN 217881834 U CN217881834 U CN 217881834U CN 202221894877 U CN202221894877 U CN 202221894877U CN 217881834 U CN217881834 U CN 217881834U
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Abstract
The utility model discloses a filter capable of adjusting capacitive coupling, which comprises a cavity, a capacitive coupling device and a first adjusting device, wherein the opening end of the cavity is fixedly provided with a cover plate, at least two adjacent resonant cavities are arranged in the cavity, and resonators are respectively arranged in the resonant cavities; the capacitive coupling device comprises a coupling rod, the coupling rod is fixed between the adjacent resonant cavities through an insulating support piece, and two ends of the coupling rod are respectively positioned in the adjacent coupling cavities; the first adjusting device is used for adjusting the capacitive coupling size, the first adjusting device comprises first screws which are arranged at two ends of the corresponding coupling rod respectively, the outer ends of the first screws are rotatably and fixedly arranged outside the cover plate, the bottom ends of the first screws penetrate through the cover plate and extend into the coupling cavity, the bottom ends of the first screws are aligned with one ends of the coupling rod, the cover plate does not need to be opened when the capacitive coupling is adjusted, time and labor are saved, the internal structure cannot be damaged, and the performance of a product cannot be influenced.
Description
Technical Field
The utility model relates to a wave filter technical field especially relates to a wave filter of tunable capacitive coupling.
Background
With the development of the mobile communication industry, radio frequency resources are more and more tense, frequency bands used by all communication systems are more and more close, mutual interference is easy to happen, and communication equipment cannot work normally, which requires that the passband of a resonant cavity filter has high out-of-band rejection requirements on adjacent channels. While achieving high out-of-band rejection is achieved by creating multiple transmission zeros by introducing capacitive or inductive coupling between multiple non-adjacent resonators.
The capacitive coupling is widely applied to a coaxial cavity band-pass filter, a transmission zero point is generated at an out-of-band rejection end close to a pass band, an out-of-band rejection curve becomes steep, and the out-of-band rejection capability is improved. Common capacitive coupling devices are: a window is arranged between the resonators of the cavity, a metal coupling rod is arranged in the middle of the window to form capacitive coupling, and the metal coupling rod is fixed on the windows of the two adjacent resonators through a supporting piece made of insulating materials.
In actual production, due to the influence of factors such as material processing precision and assembly error, capacitive coupling generally needs to be adjusted to a certain extent to be matched with actual requirements. The capacitive coupling has high requirements on the capacitive coupling device, and the capacitive coupling is generally adjustable by replacing the metal coupling rod, so that the cover plate and the capacitive coupling device need to be repeatedly disassembled and assembled, time and labor are consumed, and the product performance is influenced. Especially, in the sample manufacturing period, the difference between the final capacitive coupling device and the sample simulation is large, so that the sample preparation is often performed for many times, and the sample preparation is very inconvenient. The cover plate is disassembled and then debugged and assembled, which is very troublesome and may cause material waste.
Therefore, the above prior art has at least the following technical problems: in the prior art, the capacitive coupling device of the filter realizes the adjustability of capacitive coupling by replacing the metal coupling rod, the cover plate and the capacitive coupling device need to be repeatedly disassembled and assembled, time and labor are consumed, and the product performance is influenced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a filter of adjustable capacitive coupling, has solved among the prior art filter capacitive coupling device and has realized the adjustability of capacitive coupling through changing metal coupling pole, needs dismouting apron and capacitive coupling device repeatedly, and is consuming time hard, and influences the technical problem of producing the performance of products.
To solve the above technical problem, an embodiment of the present application provides an adjustable capacitive coupled filter, where the filter includes:
the device comprises a cavity, a sealing cover plate is fixedly arranged at an opening end of the cavity, at least two adjacent resonant cavities are arranged in the cavity, and resonators are arranged in the resonant cavities respectively;
the capacitive coupling device comprises coupling rods, the coupling rods are fixed between the adjacent resonant cavities through insulating supporting pieces, and the ends of the coupling rods are respectively positioned in the adjacent coupling cavities;
the first adjusting device is used for adjusting the capacitive coupling size and comprises first screws which are arranged corresponding to the ends of the coupling rods respectively, the outer ends of the first screws are rotatably and fixedly arranged outside the cover plate, and the bottom ends of the first screws penetrate through the cover plate to extend into the coupling cavity and are aligned with one corresponding ends of the coupling rods.
Furthermore, the coupling rod includes the body of rod and sets up at the body of rod both ends the end, just the end is the inflation head, and to two terminal surfaces that inflation head and first screw set up relatively, the terminal surface area of inflation head is greater than the terminal surface area of first screw.
Further, the expansion head is cuboid.
Furthermore, a window communicated with the two resonant cavities is formed in the partition wall between every two adjacent resonant cavities, the capacitive coupling device is arranged in the window, the supporting piece is fixedly arranged on the window in a penetrating mode, and the coupling rod is fixedly arranged on the supporting piece in a penetrating mode.
Furthermore, the support piece and the window are in interference fit, a through hole is formed in the support piece, and the coupling rod and the through hole are in interference fit.
Furthermore, the first screw is a first screw, the first screw is rotatably arranged on the cover plate in a penetrating mode, the outer end of the first screw is screwed on the cover plate through a first nut, and the inner end of the first screw extends into the coupling cavity and is aligned with the corresponding expansion head up and down.
Furthermore, the filter further comprises a second adjusting device used for adjusting the resonant frequency of the resonator, the second adjusting device comprises two second screws respectively arranged corresponding to the resonator, the second screws vertically penetrate through the cover plate, the outer ends of the second screws are rotatably and fixedly arranged outside the cover plate, and the inner ends of the second screws extend into the corresponding resonant cavities and are aligned with the resonators.
Further, the second screw is a second screw, and the outer end of the second screw is screwed on the cover plate through a second nut.
Further, the cover plate is fixed on the cavity through a fixing screw.
Furthermore, two sides of the cavity are fixedly connected with joints respectively.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
(1) The filter of this application embodiment is including the first adjusting device who is used for adjusting the capacitive coupling size, and this first adjusting device includes the first screw that the inflation head that corresponds coupling rod both ends set up respectively, and vertical run through the apron about the first screw, and rotationally set up on the apron, and the outer end of first screw is screwed up on the apron through first nut, and the inner of first screw extends to the expansion head that corresponds in the resonant cavity and aim at the coupling rod. The first nut is loosened, and the distance between the inner end of the first screw and the expansion head can be adjusted by rotating the outer end of the first screw, so that the size of capacitive coupling can be adjusted. Therefore, when the capacitive coupling is adjusted, the filter does not need to open the cover plate, the phenomenon that the capacitive coupling is adjusted by opening the cover plate for multiple times to adjust the length of the coupling rod 210 in the prior art is avoided, time and labor are saved, the internal structure is not damaged, and the performance of a product is not influenced. The filter capacitive coupling device effectively solves the technical problems that the filter capacitive coupling device in the prior art is adjustable in capacitive coupling by replacing the metal coupling rod, the cover plate and the capacitive coupling device need to be repeatedly disassembled and assembled, time and labor are consumed, and the product performance is influenced, and has the beneficial effects of simple structure, easiness in assembly, stability and reliability.
(2) Capacitive coupling device's simple structure only need in traditional coupling structure increase first screw and first nut can, saved loaded down with trivial details structural design, have great spreading value.
(3) The expansion head and the two end faces of the first screw are arranged oppositely, the end face area of the expansion head is larger than that of the first screw, the relative area of the first screw and the expansion head is large, the debugging effect is obvious, and the coupling size between the coupling rod and the first screw is enhanced.
Drawings
Fig. 1 is a schematic structural diagram of a tunable capacitive coupled filter according to an embodiment of the present application;
fig. 2 is a diagram illustrating simulation results of a tunable capacitive coupled filter according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a filter of adjustable capacitive coupling, has solved among the prior art filter capacitive coupling device and has realized the adjustability of capacitive coupling through changing metal coupling pole, needs dismouting apron and capacitive coupling device repeatedly, and is consuming time hard, and influences the technical problem of producing the performance.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the filter of this application embodiment is including the first adjusting device who is used for adjusting the capacitive coupling size, and this first adjusting device includes the first screw that the inflation head that corresponds coupling rod both ends set up respectively, and vertical run through the apron about the first screw, and rotationally set up at the apron, and the outer end of first screw is screwed up on the apron through first nut, and the inner of first screw extends to the expansion head that corresponds in the resonant cavity and aim at the coupling rod. Loosening the first nut, and adjusting the distance between the inner end of the first screw and the expansion head by rotating the outer end of the first screw, namely adjusting the size of capacitive coupling;
therefore, when the capacitive coupling is adjusted, the filter does not need to be opened, the phenomenon that the capacitive coupling is adjusted by opening the cover plate for multiple times to adjust the length of the coupling rod in the prior art is avoided, time and labor are saved, the internal structure cannot be damaged, and the performance of a product cannot be influenced. The filter capacitive coupling device effectively solves the technical problems that the filter capacitive coupling device in the prior art is adjustable in capacitive coupling by replacing the metal coupling rod, the cover plate and the capacitive coupling device need to be repeatedly disassembled and assembled, time and labor are consumed, and the product performance is influenced, and has the beneficial effects of simple structure, easiness in assembly, stability and reliability.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Fig. 1 is a schematic structural diagram of an adjustable capacitive coupling filter according to an embodiment of the present invention, as shown in fig. 1, the filter includes a cavity 100, the top surface of the cavity 100 is open and provided with a sealing cover plate 300, and the cover plate 300 is fixed on the open end of the cavity 100 by fixing screws.
The chamber 100 is integrally formed of aluminum alloy, and has a rectangular block structure with an electroplated surface. Two resonant cavities 110 with substantially the same size are opened inside the cavity 100, the resonant cavity 1 is of a coaxial structure, and the resonant cavities 110 face the opening of the opening end of the cavity 100. The resonant cavities 110 do not penetrate the cavity 100, and each resonant cavity is provided with a resonator 111 therein. A window for communicating the two resonant cavities 110 is formed on the partition wall between the two resonant cavities 110, and the capacitive coupling device 200 is inserted into the window.
The capacitive coupling device 200 generates a transmission zero at the out-of-band rejection end near the passband, and the out-of-band rejection curve becomes steep, thereby improving the out-of-band rejection capability. The capacitive coupling device 200 includes a coupling rod 210 made of a metal material, and due to the capacitive coupling, the coupling rod 210 must be insulated from the chamber 100, and therefore, the coupling rod 210 is fixed on the window by a support 230 made of an insulating material, which is as follows:
the supporting member 230 is fixedly disposed through the window, and the supporting member 230 may be fixed in the window in an interference fit manner, or may be fixed in the window in other manners, so as to support the coupling rod 210. The coupling rod 210 includes a rod body penetrating through the supporting member 230 and expansion heads 220 disposed at two ends of the rod body, so that the coupling rod 210 is overall dumbbell-shaped, and the two expansion heads 220 are respectively located in the two resonant cavities 110. Specifically, in an embodiment of the present invention, the coupling rod 210 is made of copper silver plating, and the supporting member 230 is made of Polytetrafluoroethylene (PTFE). The capacitive coupling device 200 is fixed in the chamber 100 by the supporting member 230, and is safe and reliable.
The filter of the embodiment of the present application includes a first adjusting device for adjusting the size of the capacitive coupling, the first adjusting device includes first screws 410 respectively disposed corresponding to the expansion heads 220 at the two ends of the coupling rod 210, the first screws 410 vertically penetrate the cover plate 300 up and down and are rotatably disposed on the cover plate 300, the outer ends of the first screws 410 are screwed on the cover plate 300 through first nuts 420, and the inner ends of the first screws 410 extend into the corresponding resonant cavities 110 and are aligned with the expansion heads 220 of the coupling rod 210.
Specifically, by loosening the first nut 420, the distance between the inner end of the first screw 410 and the expansion head 220 can be adjusted by rotating the outer end of the first screw 410, and when the distance between the first screw 410 and the coupling rod 210 is smaller, more capacitive coupling is transmitted to the ground (i.e., the cavity 100 and the cover plate 300), so that the capacitive coupling transmitted from the resonant cavity 110 to the resonator 120 is correspondingly reduced, and therefore, the capacitive coupling of two adjacent resonant cavities 110 is reduced, and conversely, the capacitive coupling of two adjacent resonant cavities 110 is increased. Therefore, when the capacitive coupling is adjusted, the filter of the embodiment of the application does not need to open the cover plate 300, the condition that the capacitive coupling is adjusted by opening the cover plate 300 for multiple times and adjusting the length of the coupling rod 210 in the prior art is avoided, time and labor are saved, the internal structure is not damaged, and the performance of a product is not influenced. The filter capacitive coupling device effectively solves the technical problems that the filter capacitive coupling device in the prior art is adjustable in capacitive coupling by replacing the metal coupling rod, the cover plate and the capacitive coupling device need to be repeatedly disassembled and assembled, time and labor are consumed, and the product performance is influenced, and has the beneficial effects of simple structure, easiness in assembly, stability and reliability.
Fig. 2 shows a schematic diagram of the frequency (in GHz) versus the S-parameter (in amplitude, in dB) for different lengths of the first screw 410 entering the cavity 100, where hred is the length of the first screw 410 entering the cavity 100. As can be seen from fig. 2, from hred =5 to hred =7, the greater the length of the first screw 410 entering the cavity 100, the smaller the distance of the two peaks, and the smaller the capacitive coupling.
In addition, the capacitive coupling device 200 has a simple structure, and only the first screw 410 and the first nut 420 need to be added to the traditional coupling structure, so that the complex structural design is omitted, and the capacitive coupling device has a great popularization value.
In an embodiment of the present application, the expansion head 220 is rectangular, and for two end surfaces of the expansion head 220 opposite to the first screw 410, an area of the end surface of the expansion head 220 is larger than an area of the end surface of the first screw 410, so that the opposite areas of the first screw 410 and the expansion head 220 are large, and the debugging effect is obvious, so as to enhance the coupling size between the coupling rod 210 and the first screw 410. Specifically, the end surface of the first screw 410 is circular, the end surface of the expansion head 220 is rectangular,
in other embodiments of the present application, the first screw 410 may be a bolt, a screw, or other screw structures that cooperate with the cover plate 300.
The filter of the embodiment of the present application further includes a second adjusting device 500 for adjusting the resonant frequency of the resonator 111, the second adjusting device 500 includes two second screws 510 respectively disposed corresponding to the resonators 111, the second screws 510 vertically penetrate through the cover plate 300, outer ends of the second screws 510 are screwed to the cover plate 300 by second nuts 520, and inner ends of the second screws 510 extend into the corresponding resonant cavities 110 and are aligned with the resonators 111.
Specifically, the second nut 520 is loosened, and the distance between the inner end of the second screw 510 and the resonator 111 can be adjusted by rotating the outer end of the second screw 510, so that the cover plate 300 does not need to be disassembled and assembled when the resonant frequency of the resonator 111 is adjusted, and great convenience is brought to subsequent production. Specifically, the smaller the distance between the second screw 510 and the resonator 111, the lower the resonance frequency, and conversely, the higher the resonance frequency.
The left side and the right side of the cavity 100 are respectively and fixedly connected with a connector 130, and the connectors 130 are used for connecting a test instrument, and the test instrument is used for measuring the S parameter (the S parameter is also a scattering parameter, and is an important parameter in microwave transmission) of the filter.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
(1) The filter of this application embodiment is including the first adjusting device who is used for adjusting the capacitive coupling size, and this first adjusting device includes the first screw that the inflation head that corresponds coupling rod both ends set up respectively, and vertical run through the apron about the first screw, and rotationally set up on the apron, and the outer end of first screw is screwed up on the apron through first nut, and the inner of first screw extends to the expansion head that corresponds in the resonant cavity and aim at the coupling rod. The first nut is loosened, and the distance between the inner end of the first screw and the expansion head can be adjusted by rotating the outer end of the first screw, so that the size of capacitive coupling can be adjusted. Therefore, when the capacitive coupling is adjusted, the filter does not need to open the cover plate, the condition that the capacitive coupling size is adjusted by opening the cover plate for multiple times to adjust the length of the coupling rod 210 in the prior art is avoided, time and labor are saved, the internal structure cannot be damaged, and the product performance cannot be influenced. The filter capacitive coupling device effectively solves the technical problems that the filter capacitive coupling device in the prior art is adjustable in capacitive coupling by replacing the metal coupling rod, the cover plate and the capacitive coupling device need to be repeatedly disassembled and assembled, time and labor are consumed, and the product performance is influenced, and has the beneficial effects of simple structure, easiness in assembly, stability and reliability.
(2) Capacitive coupling device's simple structure only need in traditional coupling structure increase first screw and first nut can, saved loaded down with trivial details structural design, have great spreading value.
(3) The expansion head and the two end faces of the first screw are arranged oppositely, the end face area of the expansion head is larger than that of the first screw, the relative area of the first screw and the expansion head is large, the debugging effect is obvious, and the coupling size between the coupling rod and the first screw is enhanced.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be termed a second element, and, similarly, a second element may be termed a first element, without departing from the scope of example embodiments.
The terms of orientation, outer, intermediate, inner, etc., as referred to or as may be referred to in the specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed according to the position and the use state of the structure. Therefore, these and other directional terms should not be construed as limiting terms.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. Those skilled in the art can make various changes, modifications and equivalent arrangements to those skilled in the art without departing from the spirit and scope of the present application; moreover, any equivalent alterations, modifications and variations of the above-described embodiments according to the spirit and techniques of this application are intended to be within the scope of the claims of this application.
Claims (10)
1. An adjustable capacitively coupled filter, said filter comprising:
the device comprises a cavity, a sealing cover plate is fixedly arranged at an opening end of the cavity, at least two adjacent resonant cavities are arranged in the cavity, and resonators are arranged in the resonant cavities respectively;
the capacitive coupling device comprises coupling rods, the coupling rods are fixed between the adjacent resonant cavities through insulating supporting pieces, and the ends of the coupling rods are respectively positioned in the adjacent coupling cavities;
the first adjusting device is used for adjusting the capacitive coupling size and comprises first screws which are arranged corresponding to the ends of the coupling rods respectively, the outer ends of the first screws are rotatably and fixedly arranged outside the cover plate, and the bottom ends of the first screws penetrate through the cover plate to extend into the coupling cavity and are aligned with one corresponding ends of the coupling rods.
2. The tunable capacitively coupled filter of claim 1, wherein said coupling rod includes a rod body and said ends disposed at both ends of the rod body, and said ends are expansion heads; and for two end faces of the expansion head, which are opposite to the first screw, the area of the end face of the expansion head is larger than that of the end face of the first screw.
3. An adjustable capacitive coupled filter according to claim 2, wherein said expansion head is rectangular.
4. The tunable capacitively coupled filter according to claim 2, wherein a window is formed in the partition wall between two adjacent resonators to connect the two resonators, the capacitive coupling device is disposed in the window, the support member is fixedly disposed on the window, and the coupling rod is fixedly disposed on the support member.
5. The tunable capacitively coupled filter of claim 4, wherein said support member is in interference fit with said window, said support member having a through hole, said coupling rod being in interference fit with said through hole.
6. The tunable capacitively coupled filter of claim 4, wherein said first screw is a first screw rotatably disposed through said cover plate, and an outer end of said first screw is fastened to said cover plate by a first nut, and an inner end of said first screw extends into said coupling cavity and is aligned up and down with a corresponding expansion head.
7. The tunable capacitively coupled filter of claim 1, further comprising a second adjusting device for adjusting the resonant frequencies of the resonators, wherein the second adjusting device includes two second screws respectively disposed corresponding to the resonators, the second screws vertically penetrate through the cover plate, outer ends of the second screws are rotatably and fixedly disposed outside the cover plate, and inner ends of the second screws extend into the corresponding resonator cavities and are aligned with the resonators.
8. An adjustable capacitive coupled filter according to claim 7, wherein the second screw is a second screw, the outer end of said second screw being screwed to said cover plate by a second nut.
9. The tunable capacitive coupled filter of claim 1, wherein the cover plate is secured to the cavity by a set screw.
10. The tunable capacitively coupled filter of claim 1, wherein a connector is fixedly connected to each side of the cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221894877.6U CN217881834U (en) | 2022-07-21 | 2022-07-21 | Tunable capacitively coupled filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221894877.6U CN217881834U (en) | 2022-07-21 | 2022-07-21 | Tunable capacitively coupled filter |
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| Publication Number | Publication Date |
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| CN217881834U true CN217881834U (en) | 2022-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221894877.6U Active CN217881834U (en) | 2022-07-21 | 2022-07-21 | Tunable capacitively coupled filter |
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| CN (1) | CN217881834U (en) |
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- 2022-07-21 CN CN202221894877.6U patent/CN217881834U/en active Active
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