Dielectric filters and communication equipment

Abstract

The present invention provides a dielectric filter and communication equipment, which relates to the technical field of wireless communication, wherein the dielectric filter comprises: a dielectric body and a metal cavity; wherein a plurality of frequency blind holes are arranged on the dielectric body, and the plurality of frequency blind holes divide the dielectric body into a plurality of resonant cavities; a metal cavity is loaded at the bottom of the dielectric body and at a position corresponding to each resonant cavity, and the resonant cavity and the corresponding metal cavity form a resonant unit of the dielectric filter; a metal probe is also arranged in the hollow area of ​​the metal cavity, and the axial direction of the metal probe corresponds to the axial direction of the metal cavity; one end of the metal probe is connected to the lower surface of the dielectric body along the longitudinal direction, and the other end is connected to the bottom of the metal cavity. The dielectric filter and communication equipment provided by the embodiment of the present invention can effectively reduce the volume and weight of the filter, which is not only convenient for processing, but also further meets the communication needs for miniaturization on the basis of achieving performance.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communications, and in particular to a dielectric filter and communication equipment. Background Art

[0002] With the rapid development of communication technology, wireless communication equipment is becoming more and more miniaturized, and the requirements for high-sensitivity transmission / reception of signals are becoming higher and higher, making filters more and more important in wireless communication. Compared with conventional cavity resonators, filters have the advantages of low loss, low cost, high temperature stability, and good harmonic suppression.

[0003] However, the filters currently used in low-frequency band communications are mostly large in size, which makes it difficult to meet the communication needs of wireless communication equipment towards miniaturization. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a dielectric filter and a communication device to alleviate the above technical problems.

[0005] In the first aspect, an embodiment of the present invention provides a dielectric filter, comprising: a dielectric body and a metal cavity; wherein the dielectric body is provided with a plurality of frequency blind holes, and the plurality of frequency blind holes divide the dielectric body into a plurality of resonant cavities; the bottom of the resonant cavity is loaded with the metal cavity, and the resonant cavity and the corresponding metal cavity form a resonant unit of the dielectric filter; a metal probe is further provided in the hollow area of ​​the metal cavity, and the axial direction of the metal probe corresponds to the axial direction of the metal cavity; one end of the metal probe is connected to the lower surface of the dielectric body, and the other end is connected to the bottom of the metal cavity.

[0006] Preferably, in a preferred embodiment, the dielectric filter further comprises a connecting groove arranged between two adjacent resonance units, for adjusting the coupling between the resonance units.

[0007] Preferably, in a preferred embodiment, the connection slot is a hollow slot, and the connection slot is connected or not connected to the frequency blind holes of two adjacent resonance units.

[0008] Preferably, in a preferred embodiment, the connection groove is arranged on the top of the frequency blind hole.

[0009] Preferably, in a preferred embodiment, the interlocking portion between the hollow area of ​​the metal cavity and the dielectric body is further provided with a first non-electroplating area and an electroplating area for tuning the frequency of the dielectric filter.

[0010] Preferably, in a preferred embodiment, the dielectric filter further comprises an input and output port; the input and output port comprises a first port and a second port, wherein the first port and the second port are respectively arranged at positions corresponding to the first and last resonant cavities.

[0011] Preferably, in a preferred embodiment, the first port and the second port include a blind hole and a second non-electroplating area arranged at a preset position of the blind hole; wherein the axial direction of the blind hole extends to the interior of the dielectric body.

[0012] Preferably, in a preferred embodiment, the metal cavity and the dielectric body are connected by welding.

[0013] Preferably, in a preferred embodiment, the dielectric filter is further provided with a metallized coating, and the metallized coating is provided on the outer surface of the dielectric body.

[0014] In a second aspect, an embodiment of the present invention further provides a communication device, wherein the communication device is configured with the dielectric filter described in the first aspect.

[0015] The embodiments of the present invention bring the following beneficial effects:

[0016] The dielectric filter and communication device provided by the embodiment of the present invention can divide the dielectric body into multiple resonant cavities by setting multiple frequency blind holes on the dielectric body, and a metal cavity is loaded at the bottom of the dielectric body at a position corresponding to each resonant cavity, and the resonant cavity and the corresponding metal cavity form a resonant unit of the dielectric filter, and a metal probe is also arranged in the metal cavity, which can realize the frequency adjustment of the dielectric filter in the design stage, so that the dielectric filter can achieve the required performance. At the same time, the method of loading the metal cavity can effectively reduce the overall volume and weight of the dielectric filter, which is not only convenient for processing, but also further meets the communication needs of miniaturization on the basis of achieving performance.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of a dielectric filter provided by an embodiment of the present invention;

[0021] Figure 2 A schematic structural diagram of another dielectric filter provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the three-dimensional structure of a dielectric filter provided by an embodiment of the present invention;

[0023] Figure 4 A front view of a dielectric filter provided by an embodiment of the present invention;

[0024] Figure 5 A side view of a dielectric filter provided by an embodiment of the present invention;

[0025] Figure 6 A top view of a dielectric filter provided by an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of a three-dimensional structure of a metal cavity provided in an embodiment of the present invention;

[0027] Figure 8 A frequency response diagram of a dielectric filter provided by an embodiment of the present invention.

[0028] Icon: 100-medium body; 101-frequency blind hole; 200-metal cavity; 201-metal probe; 104-connecting groove; 305-first port; 306-second port; 301-top of the cavity wall of the metal cavity; 302-top of the metal probe; 303-first non-electroplating area; 304-electroplating area; 307-blind hole; 308-second non-electroplating area. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] At present, with the rapid development of communication technology, wireless communication equipment is increasingly tending to be miniaturized, but the filters currently used in low-frequency communication are generally large in size. Therefore, it is very important to seek a filter with small size, light weight, excellent performance and low cost. Based on this, a dielectric filter and communication equipment provided in an embodiment of the present invention can improve the phenomenon of large size that is common in filters in the prior art.

[0031] To facilitate understanding of this embodiment, a dielectric filter disclosed in an embodiment of the present invention is first introduced in detail.

[0032] In a possible implementation manner, an embodiment of the present invention provides a dielectric filter. Specifically, the dielectric filter provided by the embodiment of the present invention includes: a dielectric body and a metal cavity; wherein a plurality of frequency blind holes are provided on the dielectric body, and the plurality of frequency blind holes divide the dielectric body into a plurality of resonant cavities;

[0033] The bottom of the dielectric body and the position corresponding to each resonant cavity are loaded with a metal cavity, and the resonant cavity and the corresponding metal cavity form a resonant unit of the dielectric filter.

[0034] Specifically, the metal cavity is arranged on the lower surface of the dielectric body, and the number of the metal cavities corresponds to the number of the resonance units, so that each resonance unit is loaded with a metal cavity.

[0035] For ease of understanding, Figure 1 A schematic structural diagram of a dielectric filter is shown, and for ease of description, an example in which five resonance units are arranged on the dielectric body is used for description.

[0036] like Figure 1 As shown, it includes a dielectric body 100 and five frequency blind holes 101 arranged on the dielectric body 100, and a metal cavity 200 loaded by each resonance unit.

[0037] Specifically, a metal probe is also provided in the hollow area of ​​the metal cavity 200. Figure 1 What is shown is a front view of the dielectric filter, therefore, the metal probe disposed inside the metal cavity is marked with a dotted line, that is, Figure 1 The metal probe 201 shown by the dotted line has an axial direction corresponding to the axial direction of the metal cavity; wherein one end of the metal probe is connected to the lower surface of the dielectric body, and the other end is connected to the bottom of the metal cavity.

[0038] Specifically, Figure 1 The direction indicated by the Y axis is the longitudinal direction of the dielectric body, that is, the axial direction of the metal probe and the metal cavity.

[0039] Furthermore, the metal cavity is a hollow metal cavity, and therefore, the connection area between the metal cavity and each resonance unit is the top of the cavity wall of the metal cavity, and the area where the top of the metal probe contacts the dielectric body.

[0040] In actual use, the metal cavity may be circular, square or any other shape; and the metal probe in the hollow area inside the metal cavity may be circular, square or any other shape to meet the design requirements of frequency regulation.

[0041] further, Figure 1 In the embodiment, 5 frequency blind holes are included, so 5 resonance units can be formed. It should be understood that Figure 1 The embodiment in which five frequency blind holes are included is only a possible exemplary manner. In other embodiments, the number of resonance units can be set according to actual usage.

[0042] further, Figure 1 In the embodiment, a plurality of frequency blind holes are arranged in sequence. In other embodiments, the plurality of frequency blind holes may be arranged irregularly on the medium body. The arrangement may be made according to actual usage, and the embodiment of the present invention is not limited thereto.

[0043] The dielectric filter provided by the embodiment of the present invention can divide the dielectric body into multiple resonant cavities by setting multiple frequency blind holes on the dielectric body, and a metal cavity is loaded at the bottom of the dielectric body at a position corresponding to each resonant cavity, and the resonant cavity and the corresponding metal cavity form a resonant unit of the dielectric filter, and a metal probe is also set in the metal cavity, which can realize the frequency adjustment of the dielectric filter in the design stage, so that the dielectric filter can achieve the required performance. At the same time, the method of loading the metal cavity can effectively reduce the overall volume and weight of the filter, which is not only convenient for processing, but also further meets the communication needs of miniaturization on the basis of achieving performance.

[0044] In actual use, the dielectric filter further includes a connecting slot disposed between two adjacent resonant units, for adjusting the coupling between the resonant units;

[0045] The connection slot is a hollow slot, and in order to achieve coupling adjustment according to different design requirements, the connection slot is connected or not connected to the frequency blind holes of two adjacent resonant units.

[0046] Furthermore, the connection groove can be configured to be square, circular, trapezoidal or any other shape.

[0047] Furthermore, the above-mentioned frequency blind holes are usually embedded in the interior of the dielectric body to divide the dielectric body into multiple resonant cavities, and two adjacent frequency blind holes are connected through the above-mentioned connecting grooves, and the connecting grooves can also be set in the form of blind grooves, set between two adjacent frequency blind holes, so that the two adjacent frequency blind holes are connected, or not connected, so as to adjust the coupling between the resonant units.

[0048] Further, for ease of understanding, Figure 2 shows a schematic diagram of the structure of another dielectric filter, and Figure 2 In the embodiment, the dielectric body is also provided with 5 resonance units as an example for explanation.

[0049] Specifically, Figure 2 In the example, the frequency blind hole is a circular blind hole, and the shape of the metal cavity is also circular. Multiple resonant units are arranged in sequence to form a resonant array, such as Figure 2 As shown, it includes: a dielectric body 100 , a frequency blind hole 101 , and a metal cavity 200 loaded by each resonant cavity, a metal probe 201 arranged in the hollow area of ​​the metal cavity 200 , and a connecting groove 104 .

[0050] Further, if Figure 2 As shown, the connection groove 104 is arranged at the top of the frequency blind hole along the longitudinal direction, that is, the connection groove is arranged on the dielectric body, and, along the upper surface of the Y axis, wherein, Figure 2 The middle connecting groove is arranged in a square shape and in the form of a blind groove.

[0051] also, Figure 2 A connecting slot is provided between every two adjacent frequency blind holes, and the connecting slot is respectively connected to two adjacent frequency blind holes so that the two adjacent frequency blind holes are connected. In other embodiments, the connecting slot can be set to be disconnected from the frequency blind hole according to the frequency adjustment requirements, that is, the connecting slot is only provided between the two adjacent frequency blind holes at both ends, and does not contact the frequency blind hole.

[0052] Furthermore, the aperture sizes of the connection slots can also be set to the same size or different sizes according to needs. The specific setting form can be set according to actual usage conditions, and the embodiments of the present invention are not limited to this.

[0053] Further, in Figure 2 On the basis of Figure 3 A three-dimensional structural schematic diagram of a dielectric filter is also shown.

[0054] like Figure 3 Shown, including Figure 2 The dielectric body 100 , the frequency blind hole 101 , the metal cavity 200 , the metal probe 201 and the connecting groove 104 are shown.

[0055] Specifically, Figure 3 In the dielectric filter shown in the figure, by setting frequency blind holes on the dielectric body, the dielectric body can be divided into 5 resonant cavities. The resonant units formed by two adjacent frequency blind holes are connected through connecting grooves to adjust the coupling between the resonant units. Each resonant unit is loaded with a metal cavity, which is set on the lower surface of the dielectric body along the longitudinal direction. There is a metal probe in the hollow area inside the metal cavity. The connection area between the metal cavity and each resonant unit is Figure 3 301 and 302, that is, the top 301 of the cavity wall of the metal cavity and the top 302 of the metal probe are in contact with the dielectric body.

[0056] Furthermore, in the dielectric filter provided by the embodiment of the present invention, a first non-electroplating area and an electroplating area are provided in the interlocking portion between the hollow area of ​​the metal cavity and the dielectric body, for tuning the frequency of the dielectric filter.

[0057] Specifically, Figure 3 The first non-electroplating area 303 and the electroplating area 304 are shown, wherein Figure 3 The first non-electroplating area 303 and the electroplating area 304 are arranged to be circular or annular. In other embodiments, the shapes of the first non-electroplating area and the electroplating area can also be any other shapes and any other sizes. They can be further arranged according to actual usage, and the embodiments of the present invention are not limited to this.

[0058] Furthermore, the dielectric filter provided in the embodiment of the present invention further comprises an input / output port; specifically, the input / output port comprises a first port and a second port, such as Figure 2 and Figure 3 The first port 305 and the second port 306 are shown, wherein the first port 305 and the second port 306 are respectively arranged at positions corresponding to the first and last resonant cavities, wherein, Figure 2 and Figure 3 In the embodiment shown, the resonance units are arranged in sequence to form an array. At this time, the head and tail positions of the array, that is, the positions where the first port and the second port are not set, in other embodiments, if multiple frequency blind holes are arranged irregularly on the dielectric body, at this time, the head and tail positions can be specified in the design stage, that is, the head and tail resonant cavities are specified, so as to facilitate the setting of the above-mentioned first port and the second port. The specific settings can be made according to actual usage conditions, and the embodiments of the present invention are not limited to this.

[0059] In a specific implementation, the first port and the second port include a blind hole and a second non-electroplating area arranged at a preset position of the blind hole; wherein, for the convenience of description, Figure 3Only the blind hole 307 of the second port 306 and the second non-electroplating area 308 are shown, wherein the axial direction of the blind hole extends to the inside of the dielectric body. Figure 3 In FIG. 1 , the axial direction of the first port and the second port is consistent with the longitudinal direction of the dielectric body, that is, along the Y axis, thereby forming a miniaturized dielectric filter suitable for a low frequency band.

[0060] The second non-electroplating area 308 is arranged around the blind hole 307. The shape of the blind hole and the second non-electroplating area can be circular, oval, square or any other shape, etc., wherein: Figure 3 Only a circular implementation is shown in the figure. In other implementations, the shapes of the blind hole and the second non-electroplating area can also be set according to actual usage, and the embodiment of the present invention is not limited to this.

[0061] further, Figure 1 to Figure 3 In the embodiment, the resonant cavity divided by the resonant hole corresponds to the metal cavity one by one. However, in actual use, the metal probe of the metal cavity is not required to correspond to the exact center of the bottom of the resonant hole, and can be adjusted according to actual design requirements.

[0062] Furthermore, the frequency adjustment method of the dielectric filter can achieve frequency adjustment by grinding the area of ​​the electroplating area.

[0063] In addition, the metal cavity and the dielectric body may be connected by welding, and the dielectric filter may be provided with a metallized coating, which is provided on the outer surface of the dielectric body to shield signal leakage.

[0064] Further, corresponding to Figure 3 The dielectric filter shown, Figure 4 Also shown is a front view of a dielectric filter, which includes a dielectric body 100 , a frequency blind hole 101 , a metal cavity 200 , a metal probe 201 , a connecting groove 104 , and a first port 305 and a second port 306 .

[0065] Further, corresponding to Figure 4 The front view of the dielectric filter shown, Figure 5 A side view of the dielectric filter is also shown, and Figure 6 A top view of the dielectric filter is shown. Further, Figure 7 A schematic diagram of the three-dimensional structure of a metal cavity is also shown, and Figure 7 Also shown is a metal probe 201 in the inner hollow area.

[0066] The dielectric filter shown in the above-mentioned figures in the embodiment of the present invention is described by taking the dielectric body provided with 5 resonant units as an example, and, Figure 8A frequency response diagram of a dielectric filter including five resonant units is also shown.

[0067] It should be understood that the dielectric filter provided in the embodiment of the present invention is not limited to the implementation method including 5 resonant units shown in the above-mentioned drawings. In other embodiments, the number of resonant units, as well as the shapes or parameters of structures such as frequency blind holes, metal cavities, connecting grooves, non-electroplating areas and electroplating areas, may be set in other ways, which shall be subject to actual usage, and the embodiment of the present invention is not limited to this.

[0068] In summary, the dielectric filter provided in the embodiment of the present invention can realize a miniaturized dielectric filter in the low-frequency band. The required performance can be achieved by making certain settings and adjustments on a small piece of dielectric body and loading a certain metal cavity. At the same time, the above-mentioned new dielectric filter has the characteristics of simple adjustment method, convenient processing and flexible operation, which provides a new direction for the miniaturization development of current low-frequency band dielectric filters.

[0069] Furthermore, based on the dielectric filter provided in the above embodiment, an embodiment of the present invention further provides a communication device, and the communication device is equipped with the above dielectric filter.

[0070] The communication device provided in the embodiment of the present invention has the same technical features as the dielectric filter provided in the above embodiment, and can therefore solve the same technical problems and achieve the same technical effects.

[0071] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the communication device described above can refer to the corresponding process in the aforementioned embodiment, and will not be repeated here.

[0072] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0074] Finally, it should be noted that the above embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A dielectric filter, characterized in that: include: Dielectric body and metal cavity; Wherein, a plurality of frequency blind holes are arranged on the dielectric body, and the plurality of frequency blind holes divide the dielectric body into a plurality of resonant cavities; The bottom of the dielectric body and the position corresponding to each of the resonant cavities are loaded with the metal cavity, and the resonant cavity and the corresponding metal cavity form a resonant unit of the dielectric filter; wherein the metal cavity is connected to the dielectric body by welding; A metal probe is also disposed in the hollow area of ​​the metal cavity, and the axial direction of the metal probe corresponds to the axial direction of the metal cavity; One end of the metal probe is connected to the lower surface of the dielectric body, and the other end is connected to the bottom of the metal cavity; The dielectric filter further comprises a connecting groove arranged between two adjacent resonance units for adjusting the coupling between the resonance units, and the connecting groove is arranged at the top of the frequency blind hole.

2. The dielectric filter according to claim 1, characterized in that: The connecting slot is a hollow slot, and the connecting slot is connected to or not connected to the frequency blind holes of two adjacent resonant units.

3. The dielectric filter according to claim 1, characterized in that The interlocking portion between the hollow area of ​​the metal cavity and the dielectric body is also provided with a first non-electroplating area and an electroplating area for tuning the frequency of the dielectric filter.

4. The dielectric filter according to claim 1, characterized in that: The dielectric filter also includes input and output ports; The input and output ports include a first port and a second port, wherein the first port and the second port are respectively arranged at positions corresponding to the first and last resonant cavities.

5. The dielectric filter according to claim 4, characterized in that: The first port and the second port include a blind hole and a second non-electroplating area arranged at a preset position of the blind hole; Wherein, the axial direction of the blind hole extends to the interior of the medium body.

6. The dielectric filter according to any one of claims 1 to 5, characterized in that: The dielectric filter is also provided with a metallized coating, and the metallized coating is provided on the outer surface of the dielectric body.

7. A communication device, characterized in that: The communication device is provided with the dielectric filter according to any one of claims 1 to 6.

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