Dielectric resonators, dielectric filters and communication equipment

Abstract

The present application provides a dielectric resonator, a dielectric filter, and a communication device. The dielectric resonator includes a dielectric body and a conductor surface layer. The dielectric body is provided with at least one blind hole, which extends from the surface of the dielectric body toward the interior of the dielectric body along the axial direction, and the blind hole forms an opening on the surface of the dielectric body. The conductor surface layer covers the surface of the dielectric body. The blind hole includes a first hole segment and a second hole segment arranged along the axial direction, the first hole segment being close to the opening and the second hole segment being away from the opening. Perpendicular to the axial direction, the cross-sectional area of ​​the first hole segment is smaller than the cross-sectional area of ​​the second hole segment. This dielectric resonator can correspond to a lower filtering frequency based on a smaller volume.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a dielectric resonator, a dielectric filter and a communication device. Background Art

[0002] With the rapid development of wireless communication technology, wireless communication systems require high-performance dielectric filters. The main performance of dielectric filters is frequency selection and filtering. The filtering frequency of dielectric filters is adjusted by dielectric resonators.

[0003] When existing dielectric resonators require lower filtering frequencies, this is typically achieved by increasing the cross-sectional area of ​​blind holes in the dielectric body. However, this increased blind hole cross-sectional area increases the volume occupied by the holes, resulting in a larger overall dielectric resonator size, hindering the miniaturization of communication devices using these dielectric resonators. Summary of the Invention

[0004] The present application provides a dielectric resonator, a dielectric filter, and a communication device, which can reduce the volume of a low-frequency dielectric resonator.

[0005] A first aspect of an embodiment of the present application provides a dielectric resonator comprising a dielectric body. The dielectric body is provided with at least one blind hole, the blind hole extending from the surface of the dielectric body toward the interior of the dielectric body along an axial direction, the blind hole forming an opening on the surface of the dielectric body. A conductor surface layer, the conductor surface layer covering the surface of the dielectric body. The blind hole includes a first hole segment and a second hole segment arranged along the axial direction, the first hole segment being closer to the opening, and the second hole segment being farther away from the opening. The cross-sectional area of ​​the first hole segment, perpendicular to the axial direction, is smaller than the cross-sectional area of ​​the second hole segment.

[0006] In this dielectric resonator, a conductor surface layer covers the surface of the dielectric body, acting as a shield, confining the capacitive and inductive electric fields within the dielectric body, thereby forming standing waves. The conductor surface layer can be formed of metal, such as a silver or copper layer plated on the surface of the dielectric body. The provision of a first hole segment and a second hole segment can reduce the filtering frequency. Based on the electromagnetic field distribution, a capacitive electric field approximately parallel to the axis is formed at the bottom of the blind hole, i.e., the bottom of the second hole segment. Meanwhile, an inductive electric field approximately perpendicular to the axis is formed at the periphery of the blind hole. Compared to a single-hole segment blind hole with a cross-sectional area perpendicular to the axis equal to the second hole segment, the two have the same capacitance, but the blind hole with the first hole segment has a smaller inductive volume and a stronger inductive electric field, significantly reducing the filtering frequency. Compared to simply increasing the cross-sectional area of ​​the blind hole perpendicular to the axis or increasing the depth of the blind hole along the axis to reduce the filtering frequency of the dielectric resonator, this blind hole with the first and second hole segments can reduce the volume occupied by the blind hole, thereby reducing the overall volume of the dielectric body.

[0007] Based on the first aspect, in a possible implementation manner, on a projection plane perpendicular to the axial direction, the projection of the first hole segment is located within the projection of the second hole segment.

[0008] The end of the first hole section of the dielectric resonator away from the opening can be completely open and connected to the second hole section without being partially closed. On the one hand, the dielectric resonator is easy to manufacture and improves the production yield. On the other hand, the filtering effect is more stable.

[0009] Based on the first aspect, in a possible implementation, along the axial direction, a size of the first hole segment is larger than a size of the second hole segment.

[0010] In this dielectric resonator, the size of the second hole segment in the axial direction is relatively small, and the second hole segment only needs to be able to maintain the capacitance.

[0011] Based on the first aspect, in a possible implementation manner, the first hole segment is a cylindrical hole, the second hole segment is a cylindrical hole, and the first hole segment and the second hole segment are coaxial.

[0012] In this dielectric resonator, both the first and second hole segments are cylindrical, making it easier to form standing waves, thus achieving resonant filtering. Furthermore, cylindrical holes require fewer adjustment parameters, requiring only diameter and depth, making it easier to design the dimensions of the cylindrical holes to accommodate different filtering frequencies.

[0013] Based on the first aspect, in a possible implementation manner, the blind hole further includes a third hole segment, and the third hole segment is directly connected to the second hole segment.

[0014] In this dielectric resonator, the inductive electric field formed around the third hole segment and the inductive electric field formed around the second hole segment or the first hole segment work together to increase the inductive electric field strength and further reduce the filtering frequency.

[0015] Based on the first aspect, in a possible implementation, the third hole segment extends in a direction approaching or away from the opening in an outer circumference of the second hole segment.

[0016] In this dielectric resonator, the third hole section can fully utilize the internal space of the dielectric body.

[0017] Based on the first aspect, in a possible implementation manner, the blind hole further includes a fourth hole segment, and the fourth hole segment radially extends from an outer periphery of the third hole segment.

[0018] In this dielectric resonator, the fourth hole segment increases the cross-sectional area of ​​the blind hole perpendicular to the axis, thereby increasing the capacitance and playing a role in reducing the filtering frequency.

[0019] Based on the first aspect, in a possible implementation, the third hole segment extends parallel to the axial direction.

[0020] In this dielectric resonator, the third hole segment extending parallel to the axis can be: parallel to the axis and away from the opening, or parallel to the axis and close to the opening. This makes the blind hole shape more regular and facilitates the size design of the blind hole to cope with different filtering frequencies.

[0021] Based on the first aspect, in a possible implementation, the dielectric body is made of a ceramic material, and the relative dielectric constant of the ceramic material is less than 20.

[0022] In this type of dielectric resonator, the greater the relative dielectric constant, the smaller the quality factor Q of the dielectric resonator. When the relative dielectric constant of the ceramic material is controlled within 20, the dielectric resonator has a higher quality factor Q, thereby reducing energy loss.

[0023] A second aspect of the present application provides a dielectric filter comprising a substrate and at least two dielectric resonators according to any implementation of the first aspect, wherein the at least two dielectric resonators are disposed on the substrate and coupled via the substrate.

[0024] In this dielectric filter, the dielectric resonator for the lower filtering frequency should have a smaller volume. By reducing the volume of the dielectric resonator, the volume of the dielectric filter can also be reduced.

[0025] A third aspect of the embodiments of the present application provides a communication device, comprising an antenna and the dielectric filter provided by the second aspect, wherein the antenna is coupled to the dielectric filter.

[0026] In such communication equipment, the dielectric filter for lower filtering frequencies should be smaller. By reducing the size of the dielectric filter, the communication equipment can be reduced in size, and the space occupied by the dielectric filter within the communication equipment can be reduced, thus providing space for other components within the communication equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of a dielectric resonator.

[0028] Figure 2 This is a cross-sectional view of a dielectric resonator provided in one embodiment of the present application.

[0029] Figure 3 It is a cross-sectional view of a dielectric resonator.

[0030] Figure 4 This is a cross-sectional view of a dielectric resonator provided in one embodiment of the present application.

[0031] Figure 5 This is a cross-sectional view of a dielectric resonator provided in one embodiment of the present application.

[0032] Description of main component symbols

[0033] Medium body 100

[0034] First side 101

[0035] Second side 103

[0036] Outer surface 105

[0037] Blind hole 110

[0038] Opening 1101

[0039] First hole section 111

[0040] Second hole section 113

[0041] The third hole section 115

[0042] Fourth hole section 117

[0043] Through hole 130

[0044] Conductor surface layer 200

[0045] Diameters a, a1, a2

[0046] Depth b, b1, b2

[0047] Axis direction X

[0048] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0049] The following specific embodiments illustrate the implementation of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Although the description of the present application will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this application are limited to this implementation. On the contrary, the purpose of introducing the application in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present application. In order to provide an in-depth understanding of the present application, the following description will contain many specific details. The present application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other unless there is a conflict.

[0050] Hereinafter, if used, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more. Directional terms such as "upper", "lower", "left", and "right" are defined relative to the orientation of the components schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for description and clarification relative to each other, and may change accordingly according to changes in the orientation of the components placed in the drawings.

[0051] In this application, if used, unless otherwise specified or limited, the term "connected" should be understood in a broad sense. For example, "connected" can mean fixed connection, detachable connection, or integration; it can be directly connected or indirectly connected through an intermediary. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0052] When the following embodiments are described in detail with reference to schematic diagrams, for ease of explanation, the diagrams showing local structures of the devices will not be partially enlarged according to general proportions, and the schematic diagrams are only examples and should not limit the scope of protection of this application.

[0053] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0054] Figure 1 A cross-sectional view of a dielectric resonator is shown.

[0055] See also Figure 1 This dielectric resonator includes a dielectric body 100. A blind hole 110 is provided in the dielectric body 100. Blind hole 110 is generally cylindrical. By changing the shape and size of blind hole 110, the structure of the dielectric body 100 is modified. When the dielectric body 100 receives a signal, the electromagnetic field within the dielectric body 100 changes, thereby altering the filtering frequency of the dielectric resonator.

[0056] When the filtering frequency of this dielectric resonator needs to be lowered, this can be achieved by increasing the diameter a of the blind hole 110. Increasing the diameter a of the blind hole 110 increases the bottom wall area of ​​the blind hole 110 and the strength of the capacitive electric field, thereby lowering the filtering frequency of the dielectric body 100. This method of lowering the filtering frequency by increasing the diameter a of the blind hole 110 significantly increases the space occupied by the blind hole 110 within the dielectric body 100. When the required filtering frequency is too low, the volume of the dielectric body 100 must be increased to accommodate the size of the blind hole 110.

[0057] Figure 2 A cross-sectional view of a dielectric resonator provided by the present application is shown.

[0058] See also Figure 2 This dielectric resonator includes a dielectric body 100, which is generally block-shaped. A blind hole 110 is disposed within the dielectric body 100. The blind hole 110 extends from a surface of the dielectric body 100 toward the interior of the dielectric body 100. The extension direction of the blind hole 110 is also the axial direction X of the blind hole 110. The blind hole 110 forms an opening 1101 on the surface of the dielectric body 100. The axial direction X of the blind hole 110 is generally perpendicular to the surface of the dielectric body 100 having the opening 1101.

[0059] The dielectric resonator further includes a conductor surface layer 200 , which covers the surface of the dielectric body 100 . The conductor surface layer 200 controls the distribution of the electric field so that the electromagnetic wave generated after the signal enters the dielectric resonator is confined within the dielectric body 100 , forming a standing wave within the dielectric body 100 .

[0060] The conductive surface layer 200 can be formed of metal. For example, metal can be electrosprayed onto the surface of the dielectric body 100 to shield the opening 1101 of the blind hole 110. In this case, the inner wall of the blind hole 110 does not have the conductive surface layer 200, while the outer surface of the dielectric body 100 does. Depending on the actual situation, a portion of the conductive surface layer can also be provided on the inner wall of the blind hole 110. The metal can be a highly conductive metal such as silver or copper. Alternatively, the entire dielectric body 100 including the blind hole 110 can be electrosprayed to form the conductive surface layer 200 on both the outer surface of the dielectric body 100 and the inner wall of the blind hole 110. The conductive surface layer 200 can then be removed from the portion of the conductive surface layer 200 within the blind hole 110 as needed.

[0061] The blind hole 110 includes a first hole segment 111 and a second hole segment 113 arranged sequentially along the axial direction X. An opening 1101 of the blind hole 110 is located at an end of the first hole segment 111 away from the second hole segment 113 .

[0062] The first hole section 111 and the second hole section 113 are both cylindrical holes and are coaxially arranged. The diameter a1 of the first hole section 111 is greater than the diameter a2 of the second hole section 113. That is, in a cross section perpendicular to the axial direction X, the cross-sectional area of ​​the first hole section 111 is smaller than the cross-sectional area of ​​the second hole section 113. Similarly, in a projection plane perpendicular to the axial direction X, the projection of the first hole section 111 lies within the projection of the second hole section 113.

[0063] The cylindrical hole has two adjustable dimensions: diameter and depth. To adapt the dielectric resonator to different filtering frequencies, only the diameter and depth need to be adjusted. Furthermore, both the first hole segment 111 and the second hole segment 113 are cylindrical, which enables the dielectric resonator to have a higher quality factor and reduce energy loss.

[0064] The surface of the dielectric body 100 corresponding to the opening 1101 of the blind hole 110 is the first surface 101, and the surface opposite to the first surface 101 is the second surface 103. The second surface 103 is close to the bottom wall of the blind hole 110. The other surfaces of the dielectric body 100 are peripheral surfaces 105.

[0065] When this dielectric resonator receives a signal, an inductive electric field is formed between the sidewalls of the blind hole 110 and the outer circumferential surface 105 of the dielectric body 100. A capacitive electric field is formed between the bottom wall of the blind hole 110 and the second surface 103 of the dielectric body 100. The sidewalls of the blind hole 110 and the outer circumferential surface 105 of the dielectric body 100 form multiple parallel inductors, while a capacitor is formed between the bottom wall of the blind hole 110 and the bottom surface of the dielectric body 100. This dielectric resonator essentially forms an LC circuit, enabling the dielectric resonator to function as a filter.

[0066] The filtering frequency of the dielectric resonator is related to the strength of the inductor electric field and the strength of the capacitor electric field. The frequency calculation formula of the dielectric resonator corresponds to:

[0067]

[0068] In formula 1, f is the filter frequency, L is the inductance, and C is the capacitance.

[0069] Increasing the capacitance electric field and the inductance electric field in the dielectric resonator can effectively reduce the filtering frequency of the dielectric resonator.

[0070] It is understood that the first hole segment 111 and the second hole segment 113 of the blind hole 110 can also be configured in other shapes. For example, the first hole segment 111 and the second hole segment 113 can both be square holes. A capacitive electric field can also be formed between the bottom wall of the second hole segment 113 and the second surface 103, and an inductive electric field can also be formed between the side walls of the first hole segment 111 and the second hole segment 113 and the outer peripheral surface 105 of the dielectric body 100. Moreover, both the capacitive electric field and the inductive electric field have high intensities, thereby reducing the filtering frequency.

[0071] It is understood that, on a projection plane perpendicular to the axis, the projection of the first hole segment 111 may not partially lie within the projection of the second hole segment 113. That is, the projection of the first hole segment 111 and the projection of the second hole segment 113 may be partially offset. A capacitive electric field can also be formed between the bottom wall of the second hole segment 113 and the second surface 103, and an inductive electric field can also be formed between the sidewalls of the first and second hole segments 111, 113, and the outer peripheral surface 105 of the dielectric body 100. Furthermore, both the capacitive and inductive electric fields have high intensities, thereby reducing the filtering frequency.

[0072] See also Figure 1 This type of dielectric resonator is named as the first type dielectric resonator. The blind hole 110 in the dielectric body 100 is a cylindrical hole with two parameters: diameter a and depth b. The dielectric body 100 has three dimensions: length, width, and thickness. The length and width of the dielectric body 100 correspond to the diameter a of the blind hole 110, and the thickness of the dielectric body 100 corresponds to the depth b of the blind hole 110. Figure 2 This type of dielectric resonator is designated as a second-type dielectric resonator. The blind hole 110 in the dielectric body 100 includes a first hole segment 111 and a second hole segment 113. The first hole segment 111 has two parameters: a diameter a1 and a depth b1, and the second hole segment 113 has two parameters: a diameter a2 and a depth b2. The dielectric body 100 has three dimensions: length, width, and thickness. The length and width of the dielectric body 100 correspond to the diameter of the blind hole 110, and the thickness of the dielectric body 100 corresponds to the depth of the blind hole 110.

[0073] By determining the parameters of the two dielectric resonators, their filtering frequencies can be obtained. The dielectric bodies 100 in the two dielectric resonators are both made of a material with a relative dielectric constant of 20. The filtering frequencies of the two dielectric resonators are shown in Table 1.

[0074] It can be seen from the data in Table 1 that, when the total depth of the blind hole 110 remains unchanged, the filtering frequency of the second type dielectric resonator is significantly lower than that of the first type dielectric resonator.

[0075] Table 1 Comparison of the first type dielectric filter and the second type dielectric filter

[0076]

[0077] Compared with the second type dielectric resonator with a diameter a1 of 5 mm for the first hole section 111 and a diameter a2 of 10 mm for the second hole section 113, the first type dielectric resonator with a diameter a of 10 mm for the blind hole 110 has the same bottom wall area of ​​the blind hole 110. The capacitance electric field of the two is roughly the same. However, the first hole section 111 of the second type dielectric resonator has a smaller diameter and a smaller volume, which makes the inductive electric field of the second type dielectric resonator stronger. Therefore, the second type dielectric resonator with a diameter a1 of 5 mm for the first hole section 111 and a diameter a2 of 10 mm for the second hole section 113 has a lower filtering frequency than the first type dielectric resonator with a diameter a of 10 mm for the blind hole 110.

[0078] Compared with the second type dielectric resonator with a diameter a1 of 5 mm for the first hole section 111 and a diameter a2 of 10 mm for the second hole section 113, the first type dielectric resonator with a diameter a of 5 mm for the blind hole 110 has an inductive electric field that is approximately the same as that of the first hole section 111 of the second type dielectric resonator. However, the second hole section 113 of the second type dielectric resonator has a larger diameter, that is, the bottom wall of the blind hole 110 of the second type dielectric resonator has a larger area, which makes the capacitive electric field of the second type dielectric resonator stronger. Therefore, the second type dielectric resonator with a diameter a1 of 5 mm for the first hole section 111 and a diameter a2 of 10 mm for the second hole section 113 has a lower filtering frequency than the first type dielectric resonator with a diameter a of 5 mm for the blind hole 110.

[0079] The second-type dielectric resonator adjusts the inductive and capacitive electric fields through the first hole segment 111 and the second hole segment 113, allowing the blind hole 110 of the dielectric resonator to occupy a smaller volume overall while still supporting a lower filtering frequency. Therefore, for the same filtering frequency, the blind hole 110 of the second-type dielectric resonator occupies a smaller volume, and accordingly, the dielectric body 100 can also adopt a smaller volume.

[0080] The bottom wall of the blind hole 110 and the second surface 103 of the dielectric body 100 form a capacitive electric field and an inductive electric field that couple to filter, which can correspond to a lower filtering frequency. If a through hole 130 is formed in the dielectric body 100, the dielectric resonator will correspond to a higher filtering frequency.

[0081] Figure 3 A cross-sectional view of a dielectric resonator is shown.

[0082] See also Figure 3This dielectric resonator includes a dielectric body 100, which is generally block-shaped and has a through hole 130 disposed therein. The through hole 130 extends through two opposing surfaces of the dielectric body 100. The through hole 130 extends in the axial direction X of the through hole 130. The through hole 130 includes a first hole section 111 and a second hole section 113 disposed sequentially along the axial direction X.

[0083] The first hole section 111 and the second hole section 113 are both cylindrical holes and are coaxially arranged. The diameter a1 of the first hole section 111 is greater than the diameter a2 of the second hole section 113. That is, in a cross section perpendicular to the axial direction X, the cross-sectional area of ​​the first hole section 111 is smaller than the cross-sectional area of ​​the second hole section 113. Similarly, in a projection plane perpendicular to the axial direction X, the projection of the first hole section 111 lies within the projection of the second hole section 113.

[0084] This type of dielectric resonator is designated a third-type dielectric resonator. The through hole 130 in the dielectric body 100 includes a first hole segment 111 and a second hole segment 113. The first hole segment 111 has two parameters: a diameter a1 and a depth b1, while the second hole segment 113 has two parameters: a diameter a2 and a depth b2. The dielectric body 100 has three dimensions: length, width, and thickness. The length and width of the dielectric body 100 correspond to the diameter of the blind hole 110, and the thickness of the dielectric body 100 corresponds to the depth of the through hole 130.

[0085] By determining the parameters of the second and third type dielectric resonators, their filtering frequencies can be obtained. The dielectric bodies 100 in both dielectric resonators are made of a material with a relative dielectric constant of 20. The filtering frequencies of the two dielectric resonators are compared as shown in Table 2.

[0086] As can be seen from Table 2, the filtering frequencies of the two dielectric resonators differ greatly. The second type of dielectric resonator can reduce the filtering frequency of the dielectric resonator, while the filtering frequency of the dielectric resonator in the third type of dielectric resonator is significantly increased.

[0087] Table 2 Comparison of the second type dielectric filter and the third type dielectric filter

[0088]

[0089] For Type II dielectric resonators, the material of dielectric body 100 also affects the filtering frequency. For ceramic dielectric body 100, as the relative permittivity increases, the filtering frequency of the dielectric resonator decreases, but the quality factor of the dielectric filter also decreases accordingly. Table 3 shows the filtering frequencies of Type II dielectric resonators for different relative permittivity values.

[0090] Table 3 The influence of relative dielectric constant of the second type dielectric filter on the filtering frequency

[0091]

[0092] To maintain the quality factor of the dielectric filter at a high level and reduce signal energy loss, the dielectric body 100 can be made of a ceramic material with a relative dielectric constant of less than 20. Depending on the actual use scenario, the dielectric body 100 can also be made of a material with a relative dielectric constant greater than 20. For example, when the dielectric filter corresponds to a higher filtering frequency, the dielectric body 100 can also be made of a ceramic material with a relative dielectric constant greater than 20.

[0093] Figure 4 A cross-sectional view of a dielectric resonator provided by the present application is shown.

[0094] like Figure 4 As shown, in the second type dielectric resonator, the blind hole 110 may further include a third hole segment 115 in addition to the first hole segment 111 and the second hole segment 113 .

[0095] The third hole segment 115 extends from the outer periphery of the second hole segment 113 close to the opening 1101. The extension direction of the third hole segment 115 is parallel to the axial direction X of the blind hole 110, and the third hole segment 115 is substantially annular.

[0096] The first hole segment 111, the second hole segment 113, and the third hole segment 115 work together to form an inductive electric field with the outer peripheral surface 105 of the dielectric body 100. A capacitive electric field is formed between the bottom wall of the second hole segment 113 and the second surface 103. The coupling of the inductive and capacitive electric fields enables the dielectric resonator to filter signals.

[0097] Because the bottom wall area of ​​the second hole segment 113 is relatively large, it produces a strong capacitive electric field. Furthermore, the inductive electric field strengths formed between the first hole segment 111 and the third hole segment 115, between the first hole segment 111 and the outer peripheral surface 105, and between the third hole segment 115 and the outer peripheral surface 105 are also relatively high. This results in a relatively low filtering frequency for this dielectric resonator.

[0098] It is understandable that the third hole segment 115 may also extend in other directions from the second hole segment 113. The dielectric resonator having the third hole segment 115 further adjusts the filtering frequency based on the dielectric resonator composed of the first hole segment 111 and the second hole segment 113 in the blind hole 110. The filtering frequency of this dielectric resonator is still relatively low.

[0099] Figure 5 A cross-sectional view of a dielectric resonator provided by the present application is shown.

[0100] like Figure 5As shown, the blind hole 110 further includes a fourth hole segment 117, which radially extends from the outer periphery of the third hole segment 115. A capacitive electric field is also formed between the bottom wall of the fourth hole segment 117 and the second surface 103.

[0101] It is understood that the fourth hole segment 117 may also extend in other directions from the third hole segment 115. The dielectric resonator having the fourth hole segment 117 further adjusts the filtering frequency based on the dielectric resonator composed of the first hole segment 111 and the second hole segment 113 in the blind hole 110. The filtering frequency of this dielectric resonator is still relatively low.

[0102] In the dielectric resonator provided in the present application, the blind hole 110 includes a first hole section 111 and a second hole section 113. The first hole section 111 is relatively small in volume, and a relatively strong inductive electric field is formed between the side wall of the first hole section 111 and the outer peripheral surface 105 of the dielectric body 100. The second hole section 113 has a bottom wall with a relatively large area, and a relatively strong capacitive electric field is formed between the bottom wall of the second hole section 113 and the second surface 103 of the dielectric body 100. Both the inductive electric field and the capacitive electric field have relatively high intensities, which reduces the filtering frequency. That is, when corresponding to a lower filtering frequency, that is, when the dielectric resonator is a low-frequency dielectric resonator, this form of dielectric resonator can be designed with a blind hole 110 that occupies a relatively small volume, so that the overall volume of the dielectric resonator is relatively small.

[0103] The present application also provides a dielectric filter comprising a substrate and two second-type dielectric resonators. The two resonators are disposed on the substrate, and a coupling slot is provided on the substrate. The two resonators are coupled via the coupling slot on the substrate. The coupling slot can be a capacitive coupling slot or an inductive coupling slot.

[0104] The present application also provides a communication device, including an antenna and a dielectric filter. The antenna is coupled to the dielectric filter. The antenna receives or sends signals, enabling the communication device to communicate with other communication devices.

[0105] The above description is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application should be included in the disclosure scope of the present application.

Claims

1. A dielectric resonator, characterized in that: include: The dielectric body is provided with at least one blind hole, wherein the blind hole extends from the surface of the dielectric body toward the interior of the dielectric body along the axial direction, and the blind hole forms an opening on the surface of the dielectric body; A conductor surface layer, the conductor surface layer covering the surface of the dielectric body; Each of the at least one blind hole comprises a first hole segment and a second hole segment arranged along the axis direction, wherein the first hole segment is close to the opening and the second hole segment is far from the opening; Perpendicular to the axial direction, a cross-sectional area of ​​the first hole segment of each of the at least one blind hole is smaller than a cross-sectional area of ​​the second hole segment.

2. The dielectric resonator according to claim 1, wherein On a projection plane perpendicular to the axial direction, the projection of the first hole segment is located within the projection of the second hole segment.

3. The dielectric resonator according to claim 1, wherein Along the axial direction, the size of the first hole segment is larger than the size of the second hole segment.

4. The dielectric resonator according to claim 1, wherein The first hole segment is a cylindrical hole, the second hole segment is a cylindrical hole, and the first hole segment and the second hole segment are coaxial.

5. The dielectric resonator according to claim 1, wherein The blind hole further includes a third hole segment, and the third hole segment is directly connected to the second hole segment.

6. The dielectric resonator according to claim 5, wherein The third hole segment extends in a direction approaching or away from the opening on the outer circumference of the second hole segment.

7. The dielectric resonator according to claim 5 or 6, wherein: The blind hole further includes a fourth hole segment radially extending from an outer periphery of the third hole segment.

8. The dielectric resonator according to claim 5, wherein The third hole section extends parallel to the axial direction.

9. The dielectric resonator according to claim 1, wherein The dielectric body is made of ceramic material, and the relative dielectric constant of the ceramic material is less than 20.

10. A dielectric filter, characterized in that: comprising a substrate and at least two dielectric resonators according to any one of claims 1 to 9; The at least two dielectric resonators are arranged on the substrate, and the at least two dielectric resonators are coupled through the substrate.

11. A communication device, characterized in that: comprising an antenna and a dielectric filter as claimed in claim 10; The antenna is coupled to the dielectric filter.

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