Resonator structure and filter thereof
By introducing a cross-coupling structure into the ceramic waveguide filter to form a transmission zero, the problem of balancing filter size and suppression performance in the prior art is solved, achieving both size reduction and improved suppression effect, and reducing production costs.
Patent Information
- Application Number
- CN202520564408.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-28
AI Technical Summary
When increasing the order of existing ceramic waveguide filters to improve the suppression effect, the size increases and the manufacturing precision requirements are high, making it difficult to balance size and suppression performance.
Design a resonator structure including first and second resonant cavities and a coupling unit located therebetween. A transmission zero is formed at the low-frequency stopband of the filter passband through a cross-coupling structure, reducing the size and volume of the resonator. The performance of a third-order filter is achieved by adjusting the coupling amount.
While reducing the size and volume of the resonator, the suppression effect of the low-frequency stopband is enhanced, the manufacturing process is simplified, and the cost is reduced.
Smart Images
Figure CN223956797U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to communication equipment technical field especially is to point to a resonator structure and filter thereof. BACKGROUND
[0002] A ceramic waveguide filter is a microwave filter made of ceramic material, mainly used for signal processing in radio frequency and microwave frequency bands. Its high dielectric constant and low loss characteristics make it perform well in high frequency applications. The filter with two-cavity structure is a common microwave filter design, consisting of two resonant cavities, achieving signal filtering through coupling mechanism. This structure is simple and easy to tune, widely used in radio frequency and microwave systems. Due to the inclusion of only two resonant cavities, the design complexity is low; by adjusting the cavity size or coupling mechanism, the frequency response can be flexibly tuned; the two-cavity structure can achieve high frequency selectivity; after optimization, the insertion loss is low. The resonant frequency of each cavity and the coupling degree determine the passband and stopband characteristics of the filter. Although the bandwidth is narrow and the manufacturing precision is high, its excellent performance makes it an ideal choice for many high-frequency signal processing systems. The suppression effect of the filter is usually directly related to the design order of the filter, and the two-cavity structure is equivalent to a two-order filter, which is the minimum order filter structure. In order to increase the effect of the filter on the out-of-band suppression, the passband is increased in order or the cross-coupling is increased without changing the order, and the cross-coupling is increased. Coupling between non-adjacent resonant cavities is required to form a cross-coupled minimum of three resonant cavities.
[0003] However, the deficiency of the prior art is that although the higher the order of the filter, the better the suppression effect, the higher the order, the volume of the filter will also increase. Therefore, it is urgent to design a filter that can simultaneously consider volume, multi-resonant mode and good suppression performance. UTILITY MODEL CONTENT
[0004] Therefore, the utility model wants to solve the technical problem of overcoming the deficiency in the prior art, providing a resonator structure and filter thereof, which can form a transmission zero point that enhances the suppression effect at the low frequency stopband of the filter passband, and can effectively reduce the size and volume of the resonator, and reduce the required installation space.
[0005] To solve the above technical problems, the utility model provides a resonator structure, comprising,
[0006] The body;
[0007] The resonant cavity unit comprises a first resonant cavity and a second resonant cavity arranged in sequence along a first direction on the body, the first resonant cavity comprises a first resonant hole, the second resonant cavity comprises a second resonant hole, the resonant cavity unit further comprises a third resonant hole arranged on a side surface of the body, and the first resonant hole and the second resonant hole are arranged on two opposite surfaces of the body respectively; the first resonant hole, the second resonant hole and the third resonant hole cooperate to form a cross-coupling structure.
[0008] The coupling unit is arranged on the body and is located between the first resonant cavity and the second resonant cavity to adjust the coupling amount of the first resonant cavity and the second resonant cavity; after an input signal enters the first resonant cavity and is transmitted to the second resonant cavity through a coupling mechanism, an output signal is output.
[0009] In an embodiment of the utility model, the coupling unit comprises a coupling groove, and the third resonant hole and the coupling groove are arranged on two opposite side surfaces of the body.
[0010] In an embodiment of the utility model, the body has a first surface and a second surface along a thickness direction; the body has a first side surface and a second side surface opposite to each other, and the first side surface and the second side surface extend along the first direction.
[0011] In an embodiment of the utility model, the first resonant hole is arranged on the first surface, the second resonant hole is arranged on the second surface, the third resonant hole is arranged on the first side surface, and the coupling groove is arranged on the second side surface; the depth direction of the third resonant hole is a second direction.
[0012] In an embodiment of the utility model, a projection of the coupling groove along the second direction and a projection of the third resonant hole along the second direction completely overlap or partially overlap.
[0013] In an embodiment of the utility model, the first resonant hole and the second resonant hole have the same shape in a projection along the thickness direction of the body.
[0014] In an embodiment of the utility model, the first resonant hole and the second resonant hole have a circular shape, a square shape, an elliptical shape or an irregular polygonal shape in a projection along the thickness direction of the body.
[0015] In an embodiment of the utility model, the depth of the first resonant hole is the same as the depth of the second resonant hole.
[0016] In an embodiment of the utility model, the first resonant hole, the second resonant hole and the third resonant hole are all blind holes.
[0017] The utility model also provides a filter, including at least one resonator structure as the above.
[0018] The above technical scheme of the utility model has the following advantages compared with the prior art:
[0019] The resonator structure provided by the utility model has the body, the resonant cavity unit and the coupling unit, the resonant cavity unit includes the first resonant cavity and the second resonant cavity arranged in sequence along the first direction on the body, wherein the first resonant cavity includes the first resonant hole, the second resonant cavity includes the second resonant hole, and it should be noted that the first resonant hole and the second resonant hole are arranged on the opposite two side surfaces of the body, and the coupling unit is arranged on the body and located between the first resonant cavity and the second resonant cavity to adjust the coupling amount of the first resonant cavity and the second resonant cavity; at the same time, the resonant cavity unit also includes the third resonant hole, the third resonant hole is arranged on the side surface of the body, and the third resonant hole is located between the first resonant cavity and the second resonant cavity, so that the transmission zero point for strengthening the suppression effect can be formed at the low-frequency stop band of the filter passband, compared with the prior art, the utility model can effectively reduce the size and volume of the resonator, and then reduce the installation space required, which can also facilitate assembly to a certain extent, in addition, the resonator structure of the utility model is convenient to process, so that the production and processing process can be effectively simplified, the material cost is reduced, and therefore the production and manufacturing cost can also be reduced. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to make the content of the utility model more easily understood, the utility model is further described in detail below according to the specific embodiments of the utility model and in conjunction with the drawings, wherein.
[0021] Figure 1 It is the first perspective schematic view of the overall structure of the preferred embodiment of the utility model.
[0022] Figure 2 It is the second perspective schematic view of the overall structure of the preferred embodiment of the utility model.
[0023] Figure 3 It is the third perspective schematic view of the overall structure of the preferred embodiment of the utility model.
[0024] Figure 4 It is the simulation curve and the theoretical coupling structure diagram of the resonator structure of the preferred embodiment of the utility model in the design of 3000MHz cross coupling.
[0025] The description reference signs are as follows: 100, first surface; 200, second surface; 300, first side surface; 400, second side surface; 1, first resonant cavity; 10, first resonant hole; 2, second resonant cavity; 20, second resonant hole; 30, third resonant hole; 4, coupling unit. DETAILED DESCRIPTION
[0026] The utility model will be further explained in combination with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.
[0027] The ceramic waveguide filter is a kind of filter for realizing frequency selection using the waveguide structure made of ceramic material, which can realize filtering function by the electromagnetic wave propagation characteristics of waveguide.In material selection, according to frequency requirement, suitable dielectric constant, low-loss ceramic material is selected to make waveguide structure by dry pressing forming or precision machining or injection molding, the ceramic body is densified by high-temperature sintering, and the inner wall of ceramic embryo is coated with conductive material to make electromagnetic wave propagate in waveguide cavity, a plurality of resonant cavities are assembled to form complete filter structure, and finally test and tuning are carried out to ensure that the filter performance meets the design requirements. Embodiment one
[0028] Referring to Figures 1 to 4 The utility model discloses a resonator structure, including the body;
[0029] The resonator structure further includes resonant cavity unit, the resonant cavity unit includes the first resonant cavity 1 of the body in the first direction in turn setting, the second resonant cavity 2, the first resonant cavity 1 includes the first resonant hole 10, and the second resonant cavity 2 includes the second resonant hole 20.The first resonant hole 10 and the second resonant hole 20 are arranged at the opposite two surfaces of the body respectively;The resonant cavity unit further includes the third resonant hole 30, and the third resonant hole 30 is arranged at the side surface of the body.Thus, the third resonant mode can be excited in the double-cavity structure, three transmission modes are realized based on the physical form and size structure of two cavities, and the performance of three-order filter is obtained.
[0030] The resonator structure further includes coupling unit 4, the coupling unit 4 is arranged at the body, and the coupling unit 4 is located between the first resonant cavity 1 and the second resonant cavity 2 to adjust the coupling amount of the first resonant cavity 1 and the second resonant cavity 2.
[0031] The first resonant hole 10, the second resonant hole 20 and the third resonant hole 30 form cross-coupling structure in cooperation.Input signal enters the first resonant cavity 1, and after being transmitted to the second resonant cavity 2 by coupling mechanism, output output signal.
[0032] In principle, when there is a third resonant cavity between the first resonant cavity and the second resonant cavity, the transmission of the signal changes from the original simple transmission path from the first resonant cavity to the second resonant cavity to two paths from the first resonant cavity to the second resonant cavity and from the first resonant cavity to the third resonant cavity to the second resonant cavity. Since the transmission from the first resonant cavity to the third resonant cavity to the second resonant cavity is simultaneous, there is also coupling between the first resonant cavity and the second resonant cavity, thereby forming a cross-coupling phenomenon, thereby forming a zero point on the left, i.e. Figure 4 The notch point mentioned in the above can be used to enhance the suppression. Specifically, when the first resonant hole and the second resonant hole are not in the same plane, the first resonant hole and the third resonant hole are coupled, the coupling polarity of the third resonant hole and the second resonant hole is the same, but the coupling polarity of the first resonant hole and the second resonant hole is different, and in this case, the cross-coupling zero point formed on the left (i.e. the low frequency end).
[0033] Therefore, the resonator structure to be protected by the utility model is provided with a body, a resonant cavity unit and a coupling unit. The resonant cavity unit includes a first resonant cavity and a second resonant cavity arranged in the first direction on the body in sequence. The first resonant cavity includes a first resonant hole, and the second resonant cavity includes a second resonant hole. It should be noted that the first resonant hole and the second resonant hole are arranged on the opposite side surfaces of the body. The coupling unit is arranged on the body and located between the first resonant cavity and the second resonant cavity to adjust the coupling amount of the first resonant cavity and the second resonant cavity. At the same time, the resonant cavity unit further includes a third resonant hole arranged on the side surface of the body and located between the first resonant cavity and the second resonant cavity. In this way, a transmission zero point with enhanced suppression effect can be formed at the low frequency stopband of the filter passband. Compared with the prior art, the utility model can effectively reduce the size and volume of the resonator, thereby reducing the required installation space. While reducing the size, the suppression of a certain frequency band or frequency point of the low frequency stopband is enhanced.
[0034] As a preferred embodiment, the body has a first surface 100 and a second surface 200 in the thickness direction. The body has opposite first and second side surfaces 300 and 400 extending in the first direction.
[0035] In detail, the shapes of the first resonant cavity 1 and the second resonant cavity 2 can be polyhedron, cube or irregularly shaped cube.
[0036] In the embodiment, the first resonant cavity 1 and the second resonant cavity 2 are both cuboids for easy processing and assembly.
[0037] Further, the coupling unit 4 comprises a coupling slot, and the third resonant hole 30 and the coupling slot are arranged on opposite sides of the body.
[0038] As a preferred embodiment, the first resonant hole 10 is arranged on the first surface 100, the second resonant hole 20 is arranged on the second surface 200, the third resonant hole 30 is arranged on the first side 300, and the coupling slot 4 is arranged on the second side 400. The depth direction of the third resonant hole 30 is defined as the second direction.
[0039] In detail, the projection of the coupling slot along the second direction completely overlaps or partially overlaps the projection of the third resonant hole 30 along the second direction. Of course, in a preferred embodiment, the coupling slot and the third resonant hole 30 are directly opposite to each other to achieve a better coupling effect.
[0040] As a preferred embodiment, the projections of the first resonant hole 10 and the second resonant hole 20 along the thickness direction of the body are of the same shape.
[0041] Further, the projections of the first resonant hole 10 and the second resonant hole 20 along the thickness direction of the body are circular, square, elliptical or irregular polygonal.
[0042] The shape and size of the third resonant hole 30 are not fixed, and theoretically, the design can meet the specific resonant frequency, and the coupling amount with the first resonant hole 10 and the second resonant hole 20 meets the design of the entire filter.
[0043] The depth of the first resonant hole 10 is not the same as the depth of the second resonant hole 20.
[0044] The first resonant hole 10 and the second resonant hole 20 are blind holes formed by inwardly recessing along the first surface 100 to generate and tune the frequency of the corresponding resonant cavity. The third resonant hole 30 is a blind hole formed by inwardly recessing along the first side 300.
[0045] In detail, the coupling amount between the first resonant hole 10 and the third resonant hole 10, and the coupling amount between the second resonant hole 20 and the third resonant hole 30 can be adjusted by the distance between the third resonant hole 30 and the first resonant hole 10 and the second resonant hole 20 or the size of the hole itself.
[0046] In combination Figure 4As shown, the simulation curve and the theoretical coupling structure diagram of the resonator structure of the utility model at 3000MHz design cross coupling can be seen, and the suppression at 3000MHz can reach-83.4DB.
[0047] The generation of the transmission zero point of the dielectric filter is through the cross-coupling path of the non-adjacent resonant cavity and the signal of the main coupling path to generate opposite phase superposition, so that the signal is blocked at a specific frequency outside the passband, thereby forming a transmission zero point. Embodiment two
[0048] The utility model discloses still a kind of filter, including at least one as described in embodiment one a kind of resonator structure.
[0049] The filter using the above resonator structure can form a transmission zero point at the low-frequency stopband of the filter passband, which enhances the suppression effect. It can effectively reduce the size and volume of the filter, saving materials and reducing manufacturing costs.
[0050] In the description of the utility model, it is understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.
[0051] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and other terms should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated. It can be mechanically connected, or it can be electrically connected. It can be directly connected, or it can be indirectly connected through an intermediate medium. It can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.
[0052] Obviously, the above embodiments are only examples for clear illustration, and not limited to the implementation. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the implementation is not necessary and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the utility model.
Claims
1. A resonator structure, characterized in that: include, ontology; A resonant cavity unit includes a first resonant cavity and a second resonant cavity sequentially disposed along a first direction on the body. The first resonant cavity includes a first resonant aperture, and the second resonant cavity includes a second resonant aperture. The resonant cavity unit also includes a third resonant aperture disposed on the side of the body. The first resonant aperture and the second resonant aperture are respectively disposed on two opposite surfaces of the body. The first resonant aperture, the second resonant aperture, and the third resonant aperture cooperate to form a cross-coupling structure. A coupling unit is disposed on the body, and the coupling unit is located between the first resonant cavity and the second resonant cavity to adjust the coupling amount between the first resonant cavity and the second resonant cavity; the input signal enters the first resonant cavity, is transmitted to the second resonant cavity through the coupling mechanism, and then outputs an output signal.
2. The resonator structure according to claim 1, characterized in that: The coupling unit includes a coupling groove, and the third resonant hole and the coupling groove are disposed on two opposite sides of the body.
3. A resonator structure according to claim 2, characterized in that: The body has a first surface and a second surface along the thickness direction; the body has a first side surface and a second side surface opposite to each other, the first side surface and the second side surface extending along the first direction.
4. A resonator structure according to claim 3, characterized in that: The first resonant hole is disposed on the first surface, the second resonant hole is disposed on the second surface, the third resonant hole is disposed on the first side surface, and the coupling groove is disposed on the second side surface; the depth direction of the third resonant hole is the second direction.
5. A resonator structure according to claim 4, characterized in that: The projection of the coupling groove along the second direction completely overlaps or partially overlaps with the projection of the third resonant hole along the second direction.
6. A resonator structure according to claim 1, characterized in that: The first resonant hole and the second resonant hole have the same shape when projected along the thickness direction of the body.
7. A resonator structure according to claim 1, characterized in that: The projections of the first resonant hole and the second resonant hole along the thickness direction of the body are circular, square, elliptical, or irregular polygonal.
8. A resonator structure according to claim 1, characterized in that: The depth of the first resonant hole is the same as the depth of the second resonant hole.
9. A resonator structure according to any one of claims 1-8, characterized in that: The first resonant hole, the second resonant hole, and the third resonant hole are all blind holes.
10. A filter, characterized in that: It includes at least one resonator structure as described in any one of claims 1-9.