Dielectric filters, transceivers and base stations

Abstract

The present application provides a dielectric filter, a transceiver, and a base station, which can solve the problems of a single cavity arrangement and poor out-of-band suppression capability of a dielectric filter, thereby achieving a flexible cavity arrangement and improving the suppression capability of the dielectric filter. The dielectric filter includes a dielectric body, an input port, an output port, a built-in dielectric resonator, and an external dielectric resonator arranged on the dielectric body. A plurality of built-in dielectric resonators are arranged between the input port and the output port, and the plurality of built-in dielectric resonators form a coupled main channel cascade resonator. Two external dielectric resonators are arranged on one side of the input port, and the coupling between the external dielectric resonator and the input port is greater than the coupling between the external dielectric resonator and any of the built-in dielectric resonators; and / or two external dielectric resonators are arranged on one side of the output port, and the coupling between the external dielectric resonator and the output port is greater than the coupling between the external dielectric resonator and any of the built-in dielectric resonators.

Description

Technical Field

[0001] The present application relates to the field of communication equipment components, and in particular to a dielectric filter, a transceiver and a base station. Background Art

[0002] With the rapid development of wireless communication base station equipment, especially the widespread application of 5G massive MIMO (Massive Multiple-Input Multiple-Output) base stations, dielectric waveguide filters, as a form of miniaturization and integration with better performance, are increasingly attracting widespread attention and research in the industry.

[0003] Dielectric filters are generally formed by multiple resonators and the coupling between each resonator. The coupling between each resonator can be divided into inductive coupling (also known as positive coupling) and capacitive coupling (also known as negative coupling) according to polarity. Based on the coupling polarity between each resonator, a transmission zero point can be formed. The transmission zero point, also known as the attenuation pole or notch point, refers to a frequency point outside the filter's passband at which the filter's suppression of the signal at that frequency point is theoretically infinite.

[0004] In the prior art, dielectric filters generally achieve transmission zero characteristics of dielectric filters by adding cross-coupling to the main transmission channel of the dielectric filter. However, this approach has a complex structure and poor out-of-band suppression characteristics. Summary of the Invention

[0005] The embodiments of the present application provide a dielectric filter, a transceiver, and a base station, which can solve the problem of poor out-of-band suppression capability of the dielectric filter and improve the out-of-band suppression capability of the dielectric filter.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, a dielectric filter is provided. The dielectric filter includes a dielectric body, an input port, an output port, an internal dielectric resonator, and an external dielectric resonator disposed on the dielectric body. A plurality of internal dielectric resonators are disposed between the input port and the output port, the plurality of internal dielectric resonators forming a coupled main channel cascade resonator. Two external dielectric resonators are disposed on one side of the input port, and the coupling between the external dielectric resonator and the input port is greater than the coupling between the external dielectric resonator and any of the internal dielectric resonators. Furthermore, two external dielectric resonators are disposed on one side of the output port, and the coupling between the external dielectric resonator and the output port is greater than the coupling between the external dielectric resonator and any of the internal dielectric resonators.

[0008] The built-in dielectric resonator is used to transmit radio frequency signals. Multiple built-in dielectric resonators can be provided, and the specific number of settings can be determined based on factors such as the transmission requirements of the radio frequency signal and the size of the dielectric filter. The multiple built-in dielectric resonators provided between the input port and the output port are coupled to form a coupling main channel, and the radio frequency signal is transmitted along this coupling main channel. By providing two external dielectric resonators on one side of the input port, and the coupling between the external dielectric resonator and the input port is greater than the coupling between the external dielectric resonator and any built-in dielectric resonator; or by providing two external dielectric resonators on one side of the output port, and the coupling between the external dielectric resonator and the output port is greater than the coupling between the external dielectric resonator and any built-in dielectric resonator, a pair of transmission zeros can be obtained, with the two transmission zeros being located on either side of the filter passband. If the above conditions are met and two external dielectric resonators are provided on both the input port and the output port, two pairs of transmission zeros can be obtained. In this embodiment, the "side" of the input port or output port refers to any side of the input port or output port. Since the coupling between the external dielectric resonator and the input port or output port must be greater than the coupling between the external dielectric resonator and any built-in dielectric resonator, the built-in dielectric resonator and the external dielectric resonator are preferably located on either side of the input port or output port, respectively. By attaching two external dielectric resonators to the input port or output port, two transmission zeros can be achieved, thereby improving the out-of-band suppression capability of the dielectric filter. Furthermore, the internal layout of the dielectric filter can be flexible, and either cascade resonators with an interleaved topology or a linear topology can be used. The structure is simple, molded, low-cost, reliable, and easy to mass-produce.

[0009] In a possible implementation manner of the first aspect, the angle between the first connecting line and the second connecting line is greater than or equal to 90°; and / or the angle between the third connecting line and the fourth connecting line is greater than or equal to 90°.

[0010] Among them, the first connecting line is the line connecting the center of the external dielectric resonator and the center of the input port, the second connecting line is the line connecting the center of the built-in dielectric resonator closest to the input port and the center of the input port, the third connecting line is the line connecting the center of the external dielectric resonator and the center of the output port, and the fourth connecting line is the line connecting the center of the built-in dielectric resonator closest to the output port and the center of the output port.

[0011] In this case, the position of the external dielectric resonator is set by setting the angle between the first and second connecting lines and the angle between the third and fourth connecting lines, so that the coupling between the external dielectric resonator and the input port or the output port is greater than the coupling between the external dielectric resonator and any internal dielectric resonator, thereby obtaining a pair of transmission zeros or two pairs of transmission zeros.

[0012] In one possible implementation of the first aspect, two external dielectric resonators are coupled, wherein one external dielectric resonator located near an input port or an output port is a first external dielectric resonator, and the other external dielectric resonator is a second external dielectric resonator; the first external dielectric resonator is coupled to the input port or the output port. In this case, coupling the first external dielectric resonator to the input port or the output port, and coupling the second external dielectric resonator to the first external dielectric resonator, is achieved through a cascaded arrangement. This facilitates flexible layout of the external dielectric resonators and facilitates obtaining transmission zeros.

[0013] In one possible implementation of the first aspect, the coupled main channel cascade resonators include cascade resonators with a linear topology and cascade resonators with an interleaved topology. In this case, the cascade resonators with a linear topology can simplify the structural design of the dielectric filter, allowing multiple dielectric resonators to be designed in a straight line, resulting in a simple structure and convenient layout of the dielectric filter. The cascade resonators with an interleaved topology can form cross-coupling between multiple adjacent internal dielectric resonators. This cross-coupling facilitates the transmission zero characteristics of the dielectric filter. Furthermore, the transmission zeros obtained by providing external dielectric resonators can enhance the out-of-band suppression characteristics of the dielectric filter.

[0014] When the coupled main channel cascade resonator is a non-linear cascade resonator, a first coupling slot is provided between two adjacent built-in dielectric resonators. In this case, by providing the first coupling slot, the amount of dielectric between the two adjacent built-in dielectric resonators can be controlled. By controlling the size of the first coupling slot, the amount of dielectric can be controlled, thereby controlling the amount of coupling between the two built-in dielectric resonators. By controlling the amount of coupling between the built-in dielectric resonators, the formation of the coupled main channel can be controlled. The coupled main channel cascade resonator can adopt different forms, and in practical applications, the layout of the coupled main channel cascade resonator can be flexibly adjusted, facilitating the overall layout of the dielectric filter.

[0015] In one possible implementation of the first aspect, the external dielectric resonator includes a resonator body formed by a portion of a dielectric body and a debugging hole located on the resonator body, where the debugging hole is a blind hole or a through hole. In this case, by configuring the debugging hole as a blind hole or a through hole, design flexibility of the external dielectric resonator can be maintained.

[0016] In the embodiments of the present application, the shape of the first coupling slot is related to the coupling between the built-in dielectric resonators in the cascaded resonator with a staggered topology. Because the first coupling slot can control the coupling between the two built-in dielectric resonators by controlling the amount of dielectric between them, the first coupling slot can also control the amount of dielectric between different built-in dielectric resonators by setting the amount of coupling between the two built-in dielectric resonators, thereby determining the corresponding shape of the first coupling slot.

[0017] In a possible implementation of the first aspect, the second external dielectric resonator is coupled to a proximal built-in dielectric resonator, which is a built-in dielectric resonator adjacent to a port on the side where the second external dielectric resonator is located. In this case, since the first external dielectric resonator is already coupled to the input port or the output port, and the input port is coupled to the adjacent built-in dielectric resonator, and the output port is coupled to the adjacent built-in dielectric resonator, by additionally coupling the second external dielectric resonator to the proximal built-in dielectric resonator, when the external dielectric resonator and the proximal built-in dielectric resonator are additionally coupled, a staggered layout can be adopted in the cavity arrangement, that is, the two external dielectric resonators and the proximal built-in dielectric resonator are arranged in a triangular layout. In this layout, cross-coupling is more likely to occur between the two external dielectric resonators and the proximal built-in dielectric resonator, achieving a better out-of-band suppression effect.

[0018] In a possible implementation of the first aspect, a coupling hole and / or a coupling slot is provided between the external dielectric resonator and the proximal built-in dielectric resonator, and the proximal built-in dielectric resonator is a built-in dielectric resonator adjacent to the port on the side where the external dielectric resonator is located.

[0019] In this case, by providing a coupling hole or a second coupling slot, the provided coupling hole or second coupling slot can adjust the coupling between the input port and the built-in dielectric resonator and the external dielectric resonator located on both sides of the input port, and can also adjust the coupling between the output port and the built-in dielectric resonator and the external dielectric resonator located on both sides of the output port. The coupling hole and the second coupling slot are different forms of adjusting the coupling between the input port and the built-in dielectric resonator and the external dielectric resonator, and adjusting the coupling between the output port and the built-in dielectric resonator and the external dielectric resonator. In practical applications, corresponding coupling holes or second coupling slots can be designed according to the required coupling between the input port or the output port and the built-in dielectric resonator and the external dielectric resonator. The coupling hole and the second coupling slot can be used in conjunction to achieve diversified design options and flexible adjustment of the coupling between the built-in dielectric resonator and the external dielectric resonator.

[0020] In one possible implementation of the first aspect, the coupling hole is a blind hole or a through hole, and the second coupling slot is a blind slot. In this case, by configuring the coupling hole as a through hole or a blind hole, the through hole or the blind hole has different effects on adjusting the coupling between the input port or the output port and the dielectric resonator of the corresponding port. Depending on the coupling adjustment requirements, a through hole or a blind hole can be selected to achieve a simpler adjustment method for adjusting the coupling between the input port or the output port and different dielectric resonators. This simple adjustment method also facilitates the production and processing of dielectric filters.

[0021] In a possible implementation of the first aspect, a second coupling slot is provided between the built-in dielectric resonator and the external dielectric resonator adjacent to the input port or the output port, and the second coupling slot is not connected to the built-in dielectric resonator located at one end of the second coupling slot or the external dielectric resonator located at the other end of the second coupling slot.

[0022] In this case, the built-in dielectric resonator and the external dielectric resonator are both adjacent to the input port or both adjacent to the output port. By disposing the second coupling slot so as to be disconnected from the built-in dielectric resonator and the external dielectric resonator, it is possible to reduce the coupling amount between the input port and the built-in dielectric resonator, as well as the coupling amount between the input port and the external dielectric resonator; and / or it is possible to reduce the coupling amount between the output port and the built-in dielectric resonator, as well as the coupling amount between the output port and the external dielectric resonator.

[0023] In a possible implementation of the first aspect, a second coupling slot is provided between the built-in dielectric resonator and the external dielectric resonator adjacent to the input port or the output port, and one end of the second coupling slot is connected to the built-in dielectric resonator located at one end of the second coupling slot or the external dielectric resonator located at the other end of the second coupling slot.

[0024] In this case, the built-in dielectric resonator and the external dielectric resonator are both adjacent to the input port or the output port. By providing one end of the second coupling slot to communicate with the built-in dielectric resonator located at one end of the second coupling slot or the external dielectric resonator located at one end of the second coupling slot, the coupling between the input port or the output port and the built-in dielectric resonator or the external dielectric resonator connected to one end of the second coupling slot can be enhanced, while the coupling between the built-in dielectric resonator or the external dielectric resonator not connected to the second coupling slot and the input port or the output port can be reduced, thereby regulating the coupling between the input port or the output port of the dielectric resonator and the built-in dielectric resonator or the external dielectric resonator.

[0025] In a possible implementation of the first aspect, a second coupling slot is provided between the built-in dielectric resonator and the external dielectric resonator adjacent to the input port or the output port, and two ends of the second coupling slot are respectively connected to the built-in dielectric resonator located at one end of the second coupling slot and the external dielectric resonator located at the other end of the second coupling slot.

[0026] In this case, the built-in dielectric resonator and the external dielectric resonator are both adjacent to the input port or are both adjacent to the output port. By providing a second coupling slot with both ends connected to the built-in dielectric resonator located at one end of the second coupling slot and the external dielectric resonator located at one end of the second coupling slot, respectively, the coupling between the input port and the built-in dielectric resonator and the coupling between the input port and the external dielectric resonator can be increased, and / or the coupling between the output port and the built-in dielectric resonator and the coupling between the output port and the external dielectric resonator can be increased.

[0027] In a possible implementation of the first aspect, a coupling hole is provided between the built-in dielectric resonator and the external dielectric resonator adjacent to the input port or the output port, and an axis of the coupling hole, an axis of the built-in dielectric resonator, and an axis of the external dielectric resonator are parallel to each other.

[0028] In this case, arranging the axis of the coupling hole parallel to the axis of the internal dielectric resonator and the axis of the external dielectric resonator facilitates manufacturing and processing. Furthermore, adjusting the distance between the axis of the coupling hole and the axis of the internal dielectric resonator can adjust the coupling between the input port or output port and the internal dielectric resonator, or adjusting the distance between the axis of the coupling hole and the axis of the external dielectric resonator can adjust the coupling between the input port or output port and the external dielectric resonator.

[0029] In one possible implementation of the first aspect, both the outer and inner surfaces of the dielectric body are metallized. The inner surface of the dielectric body includes all inner surfaces of through holes provided in the dielectric body, the inner surfaces and bottom surfaces of blind holes, and the inner surfaces and bottom surfaces of blind grooves. Both the outer and inner surfaces of the dielectric body are metallized to form metal walls on the outer and inner surfaces of the dielectric body, thereby forming a resonant system within the dielectric body.

[0030] In a second aspect, a transceiver is provided, comprising a receiver, a transmitter, an amplification unit, and a dielectric filter as provided in the first aspect or any possible implementation of the first aspect. This transceiver has the same technical effects as the dielectric filter provided in the aforementioned embodiment and is not further described here.

[0031] In a third aspect, a base station is provided, comprising an antenna feed component, a control component, and the transceiver provided in the second aspect. The base station has the same technical effects as the transceiver provided in the above embodiment, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is one of the schematic diagrams of a dielectric filter provided in an embodiment of the present application;

[0033] Figure 2 A second schematic diagram of a dielectric filter provided in an embodiment of the present application;

[0034] Figure 3 for Figure 1 and Figure 2 Schematic diagram of the topological structure of the dielectric filter shown;

[0035] Figure 4 for Figure 1 Response curve of the dielectric filter shown;

[0036] Figure 5 A schematic diagram of a topological structure provided in an embodiment of the present application;

[0037] Figure 6 for Figure 5 Input impedance equivalent circuit diagram of the topology shown;

[0038] Figure 7 A third schematic diagram of a dielectric filter provided in an embodiment of the present application;

[0039] Figure 8 for Figure 7 Schematic diagram of the topological structure of the dielectric filter shown;

[0040] Figure 9 for Figure 7 Response curve of the dielectric filter shown;

[0041] Figure 10 This is a schematic diagram of coupling between an input port and a built-in dielectric resonator and an external dielectric resonator in a dielectric filter provided in an embodiment of the present application;

[0042] Figure 11 for Figure 10 a cross-sectional view of one of the schematic diagrams showing coupling between the port and the internal dielectric resonator and the external dielectric resonator;

[0043] Figure 12 This is a second schematic diagram of coupling between an input port and a built-in dielectric resonator and an external dielectric resonator in a dielectric filter provided in an embodiment of the present application;

[0044] Figure 13 for Figure 12 A cross-sectional view of a second schematic diagram of coupling between the port and the built-in dielectric resonator and the external dielectric resonator;

[0045] Figure 14 This is a third schematic diagram of coupling between an input port and a built-in dielectric resonator and an external dielectric resonator in a dielectric filter provided in an embodiment of the present application;

[0046] Figure 15 for Figure 14 A cross-sectional view of a third schematic diagram of coupling between the port and the internal dielectric resonator and the external dielectric resonator;

[0047] Figure 16 A fourth schematic diagram of coupling between an input port and a built-in dielectric resonator and an external dielectric resonator in a dielectric filter provided in an embodiment of the present application;

[0048] Figure 17 Schematic diagram 5 of coupling between an input port and a built-in dielectric resonator and an external dielectric resonator in a dielectric filter provided in an embodiment of the present application;

[0049] Figure 18 Schematic diagram six of coupling between an input port and a built-in dielectric resonator and an external dielectric resonator in a dielectric filter provided in an embodiment of the present application;

[0050] Figure 19 for Figure 18 a cross-sectional view of a sixth schematic diagram of coupling between the port and the internal dielectric resonator and the external dielectric resonator;

[0051] Figure 20 A fourth schematic diagram of a dielectric filter provided in an embodiment of the present application;

[0052] Figure 21 for Figure 20 Schematic diagram of the topological structure of the dielectric filter shown;

[0053] Figure 22 A fifth schematic diagram of a dielectric filter provided in an embodiment of the present application;

[0054] Figure 23 for Figure 22 Schematic diagram of the topological structure of the dielectric filter shown.

[0055] In the figure: 10 - input port; 11, 12, 13, 14, 15 - built-in dielectric resonators; 20 - output port; 21, 22 - external dielectric resonator B; 31, 32 - external dielectric resonator A; 30, 40 - coupling slots; 50 - coupling hole; 100 - port through hole; 101 - connector. DETAILED DESCRIPTION

[0056] The technical solution in this application will be described below with reference to the accompanying drawings.

[0057] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0058] In the embodiments of the present application, sometimes a subscript such as W1 may be mistakenly written as a non-subscript form such as W1. When the difference is not emphasized, the meanings to be expressed are the same.

[0059] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of the features.

[0060] It should be understood that the terminology used in the description of the various examples herein is for the purpose of describing particular examples only and is not intended to be limiting. As used in the description of the various examples and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0061] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or plural.

[0062] It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the listed items. The term "and / or" describes an association between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this application generally indicates that the associated objects are in an "or" relationship.

[0063] It should be understood that determining B based on A does not mean determining B based solely on A. B can also be determined based on A and / or other information.

[0064] It will also be understood that the term “comprise” (also known as “includes,” “including,” “comprises,” and / or “comprising”) when used in this specification specifies the presence of stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0065] It should be understood that references throughout this specification to "one embodiment," "an embodiment," or "one possible implementation" mean that specific features, structures, or characteristics associated with that embodiment or implementation are included in at least one embodiment of the present application. Therefore, the appearance of "in one embodiment," "in an embodiment of the present application," or "one possible implementation" throughout this specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0066] refer to Figure 1 , Figure 1 This is one of the schematic diagrams of a dielectric filter provided in an embodiment of the present application. Figure 1 As shown, the dielectric filter includes a dielectric body and an input port 10, an output port 20, a built-in dielectric resonator, and an external dielectric resonator arranged on the dielectric body. A plurality of built-in dielectric resonators are arranged between the input port 10 and the output port 20. The plurality of built-in dielectric resonators form a coupled main channel cascade resonator. Two external dielectric resonators are arranged outside the input port 10; and / or two external dielectric resonators are arranged outside the output port 20.

[0067] In the embodiment of the present application, the outside of the input port 10 refers to the other side of the input port 10 relative to the output port 20, and the outside of the output port 20 refers to the other side relative to the input port 10. The coupled main channel cascade resonator refers to a plurality of built-in dielectric resonators cascaded together, and the channel formed by sequentially connecting the channels with strong coupling effect between two adjacent built-in dielectric resonators in the plurality of built-in dielectric resonators is the coupled main channel. Figure 7 As shown, the main coupling channels between the built-in dielectric resonator 11, the built-in dielectric resonator 12, the built-in dielectric resonator 13 and the built-in dielectric resonator 14 are as shown in FIG. Figure 7 As shown by the dotted line in .

[0068] On this basis, a built-in dielectric resonator is provided between the input port 10 and the output port 20. The built-in dielectric resonator is used to transmit radio frequency signals. Multiple built-in dielectric resonators can be provided, and the specific number of built-in dielectric resonators can be determined based on factors such as the transmission requirements of the radio frequency signal and the size of the dielectric filter. The multiple built-in dielectric resonators provided between the input port 10 and the output port 20 are coupled to form a main coupling channel, along which the radio frequency signal is transmitted. By providing two external dielectric resonators on the outside of the input port 10 or the output port 20, a pair of transmission zeros can be obtained, with the two transmission zeros being located on either side of the filter passband. If two external dielectric resonators are provided on the outside of both the input port 10 and the output port 20, two pairs of transmission zeros can be obtained.

[0069] By attaching two external dielectric resonators to the input port 10 or output port 20, two transmission zeros can be achieved without being affected by the internal dielectric resonator cavity layout, thereby improving the out-of-band suppression capability of the dielectric filter. Furthermore, the internal dielectric resonators within the dielectric filter can be flexibly arranged, employing either a staggered or linear topology cascade resonator. This results in a simple dielectric filter structure, allowing for mold forming, low cost, high reliability, and ease of mass production.

[0070] The specific number of built-in dielectric resonators can be determined according to the actual functional requirements of the dielectric filter. For example, refer to Figure 1 、 Figure 3 , Figure 1 This is one of the schematic diagrams of a dielectric filter provided in an embodiment of the present application. Figure 3 for Figure 1 The topological structure diagram of the dielectric filter is shown in FIG. Figure 1 、 Figure 3 As shown, four built-in dielectric resonators can be provided. They are: built-in dielectric resonator 11, built-in dielectric resonator 12, built-in dielectric resonator 13 and built-in dielectric resonator 14, wherein the built-in dielectric resonator 11 is coupled to the input port 10, the built-in dielectric resonator 12 is coupled to the built-in dielectric resonator 11, the built-in dielectric resonator 13 is coupled to the built-in dielectric resonator 12, the built-in dielectric resonator 14 is coupled to the built-in dielectric resonator 13, and the output port 20 is coupled to the built-in dielectric resonator 14, that is, the radio frequency signal is transmitted along the built-in dielectric resonator 11, the built-in dielectric resonator 12, the built-in dielectric resonator 13 and the built-in dielectric resonator 14, as shown in FIG. Figure 1 The transmission is carried out in the direction indicated by the arrow, and this path is the main coupling channel.

[0071] The principle of generating transmission zeros by disposing two external dielectric resonators outside the input port 10 and / or the output port 20 is described below. This embodiment is described by taking disposing two external dielectric resonators outside the input port 10 as an example.

[0072] refer to Figure 5 、 Figure 6 , Figure 5 A schematic diagram of a topological structure provided in an embodiment of the present application is shown. Figure 6 for Figure 5 The input impedance equivalent circuit diagram of the topology shown in Figure 1 is shown in Figure 2. Figure 5 In the circuit topology shown in the figure, the external dielectric resonator 1 and the external dielectric resonator 2 form a series suppression resonator, providing a transmission zero point for the entire link. Compared with the traditional zero cavity, non-resonant node, and suppression resonator, the resonance frequency of the traditional NRN cavity is at the transmission zero point, while Figure 5 The resonant frequency of the series external dielectric resonator 1 and the external dielectric resonator 2 in the circuit topology shown in FIG is at the center of the filter passband. In order to analyze the mechanism of the transmission zero point, the input admittance Y is first calculated. in :

[0073]

[0074] Assume the input impedance Z in for:

[0075]

[0076] When Y in When it approaches infinity, Z in Approaching 0(Z in =0), a transmission zero is generated; when Y in When it is equal to 0, a reflection zero point is generated. Therefore, the transmission zero point S can be obtained. z for:

[0077]

[0078] Reflection zero point S p for:

[0079] S p =-jb2

[0080] Wherein, b1 is the frequency factor of the external dielectric resonator 1, b2 is the frequency factor of the external dielectric resonator 2, j is the imaginary unit in the complex number, J1 is the coupling factor between the external dielectric resonator 1 and the input port 10, and J2 is the coupling factor between the external dielectric resonator 1 and the external dielectric resonator 2.

[0081] Therefore, when the transmission zero points are symmetrically distributed, both the external dielectric resonator 1 and the external dielectric resonator 2 resonate at the center frequency, that is, b1 = b2 = 0, then S z = ±jJ2, S p =0.

[0082] Through the above analysis, we can draw the following conclusions:

[0083] (1) This topology can realize a pair of out-of-band transmission zeros, which can be symmetrical transmission zeros symmetrically distributed on both sides of the passband, or asymmetric transmission zeros located on both sides of the passband;

[0084] (2) J2 can affect the location of the transmission zero point;

[0085] (3) J1 only provides coupling and has little effect on the position of the transmission zero point.

[0086] When the transmission zero points are symmetrically distributed on both sides of the passband, the external dielectric resonator 1 and the external dielectric resonator 2 provide two reflection zero points at the center frequency.

[0087] In an embodiment of the present application, the angle between the first connecting line and the second connecting line is greater than or equal to 90°; and / or the angle between the third connecting line and the fourth connecting line is greater than or equal to 90°.

[0088] Among them, the first connecting line is the line connecting the center of the external dielectric resonator and the center of the input port, the second connecting line is the line connecting the center of the built-in dielectric resonator closest to the input port and the center of the input port, the third connecting line is the line connecting the center of the external dielectric resonator and the center of the output port, and the fourth connecting line is the line connecting the center of the built-in dielectric resonator closest to the output port and the center of the output port.

[0089] By setting the angle between the first connecting line and the second connecting line to be greater than or equal to 90°, the built-in dielectric resonator and the external dielectric resonator are respectively located on both sides of the input port. In the embodiment of the present application, the side where the built-in dielectric resonator is located is defined as the inner side of the input port, and the other side is defined as the outer side of the input port. The dividing line between the inner and outer sides of the input port is a straight line passing through the center of the input port and perpendicular to the second connecting line. The center of the external dielectric resonator can be located just on the dividing line or on the outer side of the input port. By setting the position of the external dielectric resonator, the external dielectric resonator is prevented from directly coupling with the built-in dielectric resonator without passing through the input port, and becoming part of the coupled main channel cascade resonator. The wave transmission path passes through the input port and then to the external dielectric resonator, thereby realizing the generation of a transmission zero point.

[0090] By setting the angle between the third connecting line and the fourth connecting line to be greater than or equal to 90°, the built-in dielectric resonator and the external dielectric resonator are respectively located on both sides of the output port. In the embodiment of the present application, the side where the built-in dielectric resonator is located is defined as the inner side of the output port, and the other side is defined as the outer side of the output port. The dividing line between the inner and outer sides of the output port is a straight line passing through the center of the output port and perpendicular to the fourth connecting line. The center of the external dielectric resonator can be located just on the dividing line or on the outer side of the output port. By setting the position of the external dielectric resonator, the external dielectric resonator is prevented from directly coupling with the built-in dielectric resonator without passing through the output port, thereby becoming part of the coupled main channel cascade resonator. The wave transmission path passes through the output port and then to the external dielectric resonator, thereby achieving the generation of a transmission zero point.

[0091] In the embodiment of the present application, two external dielectric resonators are coupled, and one of the external dielectric resonators close to the input port 10 or the output port 20 is coupled to the input port 10 or the output port 20. It can be understood that the coupling of one of the external dielectric resonators to the input port 10 or the output port 20 is achieved through a cascaded manner. This design method meets the theoretical basis for obtaining a transmission zero point as described above and is conducive to obtaining a transmission zero point.

[0092] Since this embodiment includes an external dielectric resonator and an external dielectric resonator disposed outside the input port 10, and an external dielectric resonator and an external dielectric resonator disposed outside the output port 20, for ease of description and distinction, the external dielectric resonator located near the input port 10 outside the input port 10 is named external dielectric resonator A31, and the other external dielectric resonator located near the input port 10 outside the input port 10 is named external dielectric resonator A32; the external dielectric resonator located near the output port 20 outside the output port 20 is named external dielectric resonator B21, and the external dielectric resonator located near the output port 20 outside the output port 20 is named external dielectric resonator B22.

[0093] In an embodiment of the present application, the coupled main channel cascade resonators include cascade resonators with a linear topology and cascade resonators with an interleaved topology. The cascade resonators with a linear topology can simplify the structural design of the dielectric filter, allowing multiple built-in dielectric resonators to be designed in a straight line, resulting in a simple structure and convenient layout of the dielectric filter. The cascade resonators with an interleaved topology can form cross-coupling between multiple adjacent built-in dielectric resonators. Cross-coupling is beneficial for achieving the transmission zero characteristics of the dielectric filter. In addition, the transmission zero obtained by setting the external dielectric resonator is beneficial for enhancing the out-of-band suppression characteristics of the dielectric filter.

[0094] The specific configurations of the cascade resonators of the linear topology and the cascade resonators of the staggered topology are described below.

[0095] Example 1

[0096] In this example, refer to Figure 2 、 Figure 3 , Figure 2 This is a second schematic diagram of a dielectric filter provided in an embodiment of the present application. Figure 2 The topological structure diagram of the dielectric filter is shown in Figure 3 As shown. Figure 2 、 Figure 3 As shown, multiple built-in dielectric resonators are arranged between the input port 10 and the output port 20. The multiple built-in dielectric resonators are arranged in a straight line, and the input port 10 and the output port 20 are also arranged on the straight line. In this example, a total of four built-in dielectric resonators are set, among which the built-in dielectric resonator 11 is coupled with the input port 10, the built-in dielectric resonator 12 is coupled with the built-in dielectric resonator 11, the built-in dielectric resonator 13 is coupled with the built-in dielectric resonator 12, the built-in dielectric resonator 14 is coupled with the built-in dielectric resonator 13, and the output port 20 is coupled with the built-in dielectric resonator 14, forming a linear coupling main channel. The radio frequency signal is transmitted from the input port 10 to the output port 20 along the coupling main channel. Figure 2 As shown, two external dielectric resonators, B21 and B22, are disposed outside the output port 20. External dielectric resonator B21 is coupled to the output port 20, while external dielectric resonator B22 is coupled to external dielectric resonator B21. External dielectric resonators B21 and B22 can be arranged in a straight line with the four internal dielectric resonators. This arrangement eliminates the need to consider cross-coupling between the internal dielectric resonators, resulting in a very simple dielectric filter structure, easy processing, and amenable to mass production.

[0097] Example 2

[0098] In this example, refer to Figure 1 、 Figure 3 , Figure 1 This is one of the schematic diagrams of a dielectric filter provided in an embodiment of the present application. Figure 1 The topological structure diagram of the dielectric filter is shown in Figure 3 As shown. Figure 1 、 Figure 3 As shown, multiple built-in dielectric resonators can be set between the input port 10 and the output port 20. The multiple built-in dielectric resonators can be arranged in multiple rows. This arrangement is to facilitate the layout of the dielectric filter and make full use of the longitudinal space of the dielectric filter. However, the multiple built-in dielectric resonators only form one main coupling channel. In this example, a total of four built-in dielectric resonators are arranged in two rows, two in each row, as shown in FIG. Figure 1As shown, the four built-in dielectric resonators are respectively located at the four corners of the rectangle. Of course, the arrangement of multiple built-in dielectric resonators is not limited to this. Among them, the built-in dielectric resonator 11 is coupled with the input port 10, the built-in dielectric resonator 12 is coupled with the built-in dielectric resonator 11, the built-in dielectric resonator 13 is coupled with the built-in dielectric resonator 12, the built-in dielectric resonator 14 is coupled with the built-in dielectric resonator 13, and the output port 20 is coupled with the built-in dielectric resonator 14, forming a "U"-shaped coupling main channel, and the RF signal is transmitted from the input port 10 to the output port 20 along the coupling main channel. Figure 1 As shown, two external dielectric resonators are disposed outside the output port 20: an external dielectric resonator B21 and an external dielectric resonator B22. The external dielectric resonator B21 is coupled to the output port 20, and the external dielectric resonator B22 is coupled to the external dielectric resonator B21. The external dielectric resonators B21 and B22 can be arranged according to the structure of the dielectric filter. In this example, the layout of the two external dielectric resonators is similar to the longitudinal layout of the internal dielectric resonator. This layout can fully utilize the space of the dielectric filter.

[0099] By setting two external dielectric resonators outside the output port 20, two transmission zeros can be generated to achieve good out-of-band suppression effect. Figure 4 , Figure 4 for Figure 1 The response curve of the dielectric filter is shown in Figure 2. Figure 4 As shown in the figure, there are two curves, curve S11 is the signal reflection curve of the signal transmitted in the dielectric filter shown in this example, and curve S21 is the signal transmission curve of the signal transmitted in the dielectric filter shown in this example. The smaller part in the middle of curve S11 represents the passband of the coupled main channel cascade resonator in the dielectric filter of this example, and the two inflection points on S21 represent two transmission zero points, which are distributed on both sides of the passband.

[0100] Example 3

[0101] In this example, refer to Figure 7 、 Figure 8 , Figure 7 This is a third schematic diagram of a dielectric filter provided in an embodiment of the present application. Figure 8 for Figure 7 The topological structure diagram of the dielectric filter is shown in FIG. Figure 7 、 Figure 8As shown, multiple built-in dielectric resonators can be set between the input port 10 and the output port 20. The layout of the multiple built-in dielectric resonators in this example is similar to the layout of the built-in dielectric resonators in Example 2, and will not be described in detail here. The layout can refer to the layout of the built-in dielectric resonators in Example 2. The four built-in dielectric resonators form a "U"-shaped coupling main channel, and the RF signal is transmitted from the input port 10 to the output port 20 along the "U"-shaped coupling main channel. Figure 7 、 Figure 8 As shown, two external dielectric resonators are provided outside the input port 10: an external dielectric resonator A31 and an external dielectric resonator A32. External dielectric resonator A31 is coupled to the input port 10, and external dielectric resonator A32 is coupled to external dielectric resonator A31. Two external dielectric resonators are also provided outside the output port 20: an external dielectric resonator B21 and an external dielectric resonator B22. External dielectric resonator B21 is coupled to the output port 20, and external dielectric resonator B22 is coupled to external dielectric resonator B21. The layout of the two external dielectric resonators at the input port 10 can be the same as the layout of the two external dielectric resonators at the output port 20, and can refer to the layout of the two external dielectric resonators outside the output port 20 in Example 2.

[0102] By arranging two external dielectric resonators outside the input port 10 and two external dielectric resonators outside the output port 20, four transmission zeros can be generated to achieve better out-of-band suppression. Figure 9 , Figure 9 for Figure 7 The response curve of the dielectric filter is shown in Figure 2. Figure 9 As shown in the figure, there are two curves, curve S11 is the reflection curve of the signal transmitted in the dielectric filter shown in this example, and curve S21 is the transmission curve of the signal transmitted in the dielectric filter shown in this example. The part with smaller fluctuations in the middle of curve S11 represents the passband of the coupled main channel cascade resonator in the dielectric filter of this example. There are four inflection points on S21, each inflection point represents a transmission zero point, and the four inflection points are basically symmetrically distributed on both sides of the passband.

[0103] Example 4

[0104] In this example, reference Figure 20 、 Figure 21 , Figure 20 This is a fourth schematic diagram of a dielectric filter provided in an embodiment of the present application. Figure 21 for Figure 20 The topological structure diagram of the dielectric filter is shown in FIG. Figure 20 、 21As shown, a plurality of built-in dielectric resonators are provided between the input port 10 and the output port 20, and the plurality of built-in dielectric resonators are arranged in a staggered manner. Figure 21 The solid lines between the built-in dielectric resonators in the figure represent the main coupling channels, while the dashed lines indicate coupling between the built-in dielectric resonators at both ends of the dashed line, or coupling between the built-in dielectric resonator at one end of the dashed line and the external dielectric resonator at the other end. The following description uses built-in dielectric resonators 11, 12, and 13 as examples.

[0105] The coupling path between the built-in dielectric resonator 11 and the built-in dielectric resonator 12, and the coupling path between the built-in dielectric resonator 12 and the built-in dielectric resonator 13 are part of the coupling main channel. Figure 21 In the figure, the coupling path is represented by a solid line. Built-in dielectric resonator 11 and built-in dielectric resonator 13 are also coupled. This coupling path, which is not part of the main coupling path and is represented by a dotted line, enables cross-coupling between built-in dielectric resonator 11, built-in dielectric resonator 12, and built-in dielectric resonator 13.

[0106] In this example, a total of five built-in dielectric resonators are provided, wherein the built-in dielectric resonator 11 is coupled to the input port 10, the built-in dielectric resonator 12 is coupled to the built-in dielectric resonator 11, the built-in dielectric resonator 13 is coupled to the built-in dielectric resonator 12, the built-in dielectric resonator 14 is coupled to the built-in dielectric resonator 13, the built-in dielectric resonator 15 is coupled to the built-in dielectric resonator 14, and the output port 20 is coupled to the built-in dielectric resonator 15. The five built-in dielectric resonators are arranged in an interlaced manner to form a zigzag coupling main channel. The path of the coupling main channel can be as follows: Figure 20 As shown in the curve in FIG, the arrow at the end of the curve represents the transmission path of the radio frequency signal, and the radio frequency signal is transmitted from the input port 10 to the output port 20 along the coupling main channel.

[0107] like Figure 20As shown, two external dielectric resonators are provided outside the output port 20: an external dielectric resonator B21 and an external dielectric resonator B22. The external dielectric resonator B21 is coupled to the output port 20, and the external dielectric resonator B22 is coupled to the external dielectric resonator B21. The external dielectric resonator B22 can also be coupled to the internal dielectric resonator 15. The layout design of the two external dielectric resonators can be determined according to the design requirements of the dielectric filter. In this example, the layout of the two external dielectric resonators refers to the layout of the internal dielectric resonators, which is the same as the layout of the internal dielectric resonator 14 and the internal dielectric resonator 15. The layout design of the cascaded resonators with an interleaved topology structure allows the internal dielectric resonators to form cross-coupling when forming the coupling main channel. The cross-coupling is conducive to achieving the transmission zero characteristics of the dielectric filter. In addition, the transmission zero formed by the two external dielectric resonators improves the out-of-band suppression capability of the entire dielectric filter.

[0108] Example 5

[0109] In this example, reference Figure 22 、 Figure 23 , Figure 22 This is a fifth schematic diagram of a dielectric filter provided in an embodiment of the present application. Figure 23 for Figure 22 The topological structure diagram of the dielectric filter is shown in FIG. Figure 22 、 Figure 23 As shown, a plurality of built-in dielectric resonators are provided between the input port 10 and the output port 20, and the plurality of built-in dielectric resonators are arranged in a staggered manner.

[0110] In this example, a total of three built-in dielectric resonators are provided, wherein the built-in dielectric resonator 11 is coupled to the input port 10, the built-in dielectric resonator 12 is coupled to the built-in dielectric resonator 11, the built-in dielectric resonator 13 is coupled to the built-in dielectric resonator 12, and the output port 20 is coupled to the built-in dielectric resonator 13. The three built-in dielectric resonators are arranged in an interlaced manner to form a zigzag coupling main channel, and the RF signal is transmitted from the input port 10 to the output port 20 along the coupling main channel.

[0111] like Figure 22As shown, two external dielectric resonators are provided outside the input port 10: an external dielectric resonator A31 and an external dielectric resonator A32. The external dielectric resonator A31 is coupled to the output port 20, and the external dielectric resonator A32 is coupled to the external dielectric resonator A31. The external dielectric resonator A32 can also be coupled to the internal dielectric resonator 11. Two external dielectric resonators are provided outside the output port 20: an external dielectric resonator B21 and an external dielectric resonator B22. The external dielectric resonator B21 is coupled to the output port 20, and the external dielectric resonator B22 is coupled to the external dielectric resonator B21. The external dielectric resonator B22 can also be coupled to the internal dielectric resonator 13.

[0112] The layout design of the two external dielectric resonators outside each port can be determined based on the design requirements of the dielectric filter. In this example, the layout of external dielectric resonators A31 and A32 refers to the layout of internal dielectric resonators 11 and 12, while the layout between external dielectric resonators B21 and B22 refers to the layout between internal dielectric resonators 13 and 12. In this example, two external dielectric resonators are provided at the external ends of both input port 10 and output port 20, achieving four transmission zeros and providing improved out-of-band suppression.

[0113] When the coupling main channel cascade resonators are arranged in a non-linear manner, a coupling slot 30 is provided between two adjacent built-in dielectric resonators. Figure 1 、 Figure 7 、 Figure 20 and Figure 22 By providing coupling slots 30, the amount of dielectric between two adjacent built-in dielectric resonators can be controlled. By controlling the size of the coupling slots 30, the amount of dielectric can be controlled, thereby controlling the coupling between the two built-in dielectric resonators. By controlling the coupling between the built-in dielectric resonators, the formation of the coupled main channel can be controlled. The coupled main channel cascade resonators can be configured in various ways, allowing for flexible adjustment of their layout in practical applications, facilitating the overall layout of the dielectric filter.

[0114] The shape of the coupling slot 30 is related to the coupling strength between the internal dielectric resonators in the cascaded resonator with the staggered topology. The coupling slot 30 can control the coupling strength between two internal dielectric resonators by adjusting the amount of dielectric between them. Conversely, by adjusting the amount of dielectric between two internal dielectric resonators, the amount of dielectric between different internal dielectric resonators can be determined, thereby determining the corresponding shape of the coupling slot 30.

[0115] In an embodiment of the present application, an external dielectric resonator includes a resonator body formed from a portion of a dielectric body and a debugging hole located in the resonator body, wherein the debugging hole is a blind hole or a through hole. In this embodiment, the resonator body is a portion of the dielectric body, and the debugging hole is configured as a blind hole or a through hole. The frequency of the external dielectric resonator can be adjusted by setting the depth of the debugging hole. In other words, the debugging hole of the external dielectric resonator can be flexibly selected as a blind hole or a through hole according to the design requirements of the dielectric filter, thereby maintaining design flexibility.

[0116] In an embodiment of the present application, an external dielectric resonator A32 or an external dielectric resonator B22 is coupled to a proximal built-in dielectric resonator, and the proximal built-in dielectric resonator is a built-in dielectric resonator adjacent to the port on the side where the external dielectric resonator A32 or the external dielectric resonator B22 is located. The port on the side where the external dielectric resonator A32 or the external dielectric resonator B22 is located can be the input port 10 or the output port 20, which is determined specifically based on the position of the external dielectric resonator. For example, if the external dielectric resonator A32 is only provided at the input port 10, then the port refers to the input port 10; if the external dielectric resonator B22 is only provided at the output port 20, then the port refers to the output port 20; if the external dielectric resonator A32 or the external dielectric resonator B22 is provided at both the input port 10 and the output port 20, then the port refers to both the input port 10 and the output port 20.

[0117] Since the external dielectric resonator A32 or the external dielectric resonator B22 is already coupled to the input port 10 or the output port 20, and the input port 10 is coupled to the adjacent built-in dielectric resonator (the first built-in dielectric resonator in the coupled main channel cascade resonator), and the output port 20 is coupled to the adjacent built-in dielectric resonator (the last built-in dielectric resonator in the coupled main channel cascade resonator), a staggered layout can be adopted when arranging the cavities, that is, the two external dielectric resonators and the proximal built-in dielectric resonator are arranged in a triangular layout. In this layout, cross-coupling is more likely to occur between the two external dielectric resonators and the proximal built-in dielectric resonator, thereby achieving a better out-of-band suppression effect.

[0118] Example 1

[0119] like Figure 20As shown, two external dielectric resonators are disposed outside output port 20. External dielectric resonator B21 is coupled to output port 20, and external dielectric resonator B22 is coupled to external dielectric resonator B21. Output port 20 is coupled to internal dielectric resonator 15, which is the near-end internal dielectric resonator. Coupling external dielectric resonator B22 with internal dielectric resonator 15 creates cross-coupling between external dielectric resonator B21, external dielectric resonator B22, and internal dielectric resonator 15, achieving better out-of-band suppression.

[0120] Example 2

[0121] like Figure 22 As shown, two external dielectric resonators are provided outside both input port 10 and output port 20. External dielectric resonator A31 outside input port 10 is coupled to input port 10, and external dielectric resonator A32 is coupled to external dielectric resonator A31. Input port 10 is coupled to internal dielectric resonator 11, which is the proximal internal dielectric resonator of input port 10. External dielectric resonator B21 outside output port 20 is coupled to output port 20, and external dielectric resonator B22 is coupled to external dielectric resonator B21. Output port 20 is coupled to internal dielectric resonator 13, which is the proximal internal dielectric resonator of output port 20. Cross-coupling is formed between external dielectric resonators A31 and A32 and internal dielectric resonator 11, and between external dielectric resonators B21 and B22 and internal dielectric resonator 13. Cross-coupling occurs at both ports, achieving better out-of-band suppression.

[0122] In an embodiment of the present application, a coupling hole 50 and / or a coupling slot 40 is provided between the built-in dielectric resonator adjacent to the input port 10 and the external dielectric resonator A31 adjacent to the input port 10; and / or a coupling hole 50 and / or a coupling slot 40 is provided between the built-in dielectric resonator adjacent to the output port 20 and the external dielectric resonator B21 adjacent to the output port 20.

[0123] By providing a coupling hole 50 or a coupling slot 40, the coupling hole 50 or coupling slot 40 can adjust the coupling between the input port 10 and the internal dielectric resonator and the external dielectric resonator A31 located on either side of the input port 10, and can also adjust the coupling between the output port 20 and the internal dielectric resonator and the external dielectric resonator B21 located on either side of the output port 20. The coupling hole 50 and coupling slot 40 are different forms of adjusting the coupling between the input port 10 or the output port 20 and the internal dielectric resonator and the external dielectric resonator. In practical applications, the corresponding coupling hole 50 or coupling slot 40 can be designed according to the required coupling between the input port 10 or the output port 20 and the internal dielectric resonator and the external dielectric resonator. The coupling hole 50 and coupling slot 40 can be used in conjunction with each other, achieving diverse design options and flexible adjustment of the coupling between the internal dielectric resonator and the external dielectric resonator.

[0124] In the embodiment of the present application, the coupling hole 50 is a blind hole or a through hole, and the coupling slot 40 is a blind slot. By setting the coupling hole 50 as a through hole or a blind hole, the through hole or the blind hole has different effects on adjusting the coupling between the input port 10 or the output port 20 and the dielectric resonator of the corresponding port. According to the coupling adjustment requirements, the through hole or the blind hole can be selected to achieve a simpler adjustment method for adjusting the coupling between the input port 10 or the output port 20 and different dielectric resonators. This simple adjustment method also facilitates the production and processing of dielectric filters.

[0125] The following combination Figures 10 to 18 The arrangement and combination of the coupling hole 50 and the coupling slot 40 are introduced.

[0126] Example 1

[0127] A coupling slot 40 is provided between the built-in dielectric resonator and the external dielectric resonator adjacent to the input port 10, or a coupling slot 40 is provided between the built-in dielectric resonator and the external dielectric resonator adjacent to the output port 20. The coupling slot 40 is not connected to the built-in dielectric resonator located at one end of the coupling slot 40 or the external dielectric resonator located at the other end of the coupling slot 40.

[0128] The built-in dielectric resonator and the external dielectric resonator are both adjacent to the input port 10 or are both adjacent to the output port 20. By providing a coupling slot 40 that is not connected to the built-in dielectric resonator and the external dielectric resonator, the coupling amount between the input port 10 and the built-in dielectric resonator and the coupling amount between the input port 10 and the external dielectric resonator can be reduced; and / or the coupling amount between the output port 20 and the built-in dielectric resonator and the coupling amount between the output port 20 and the external dielectric resonator can be reduced.

[0129] The following description will be made by taking as an example the case where a coupling slot 40 is provided between the internal dielectric resonator and the external dielectric resonator adjacent to the input port 10. Figure 10 、 Figure 11 , Figure 10 This is a schematic diagram of coupling between an input port and a built-in dielectric resonator and an external dielectric resonator in a dielectric filter provided in an embodiment of the present application. Figure 11 for Figure 10 A cross-sectional view of one of the schematic diagrams of coupling between the port shown and the built-in dielectric resonator and the external dielectric resonator. Figure 10 、 Figure 11 As shown, the internal dielectric resonator adjacent to the input port 10 is the internal dielectric resonator 11, and the external dielectric resonator adjacent to the input port 10 is the external dielectric resonator A31. A coupling slot 40 is provided between the internal dielectric resonator 11 and the external dielectric resonator A31. The coupling slot 40 is not connected to either the internal dielectric resonator 11 or the external dielectric resonator A31. The coupling between the input port 10 and the internal dielectric resonator 11, and between the input port 10 and the external dielectric resonator, can be adjusted by adjusting the dimensions of the coupling slot 40, such as its depth, length, or width.

[0130] Example 2

[0131] A coupling slot 40 is provided between the built-in dielectric resonator and the external dielectric resonator adjacent to the input port 10, or between the built-in dielectric resonator and the external dielectric resonator adjacent to the output port 20. One end of the coupling slot 40 is connected to the built-in dielectric resonator located at one end of the coupling slot 40 or the external dielectric resonator located at the other end of the coupling slot 40.

[0132] The following description will be made by taking as an example the case where a coupling slot 40 is provided between the internal dielectric resonator and the external dielectric resonator adjacent to the input port 10. Figure 12 、 Figure 13 , Figure 12 This is a second schematic diagram of coupling between an input port and a built-in dielectric resonator and an external dielectric resonator in a dielectric filter provided in an embodiment of the present application. Figure 13 for Figure 12 The cross-sectional view of the second schematic diagram of the coupling between the port and the built-in dielectric resonator and the external dielectric resonator. Figure 12 、 Figure 13As shown, the built-in dielectric resonator adjacent to the input port 10 is the built-in dielectric resonator 11, and the external dielectric resonator adjacent to the input port 10 is the external dielectric resonator A31. A coupling slot 40 is provided between the built-in dielectric resonator 11 and the external dielectric resonator A31. The coupling slot 40 is not connected to the built-in dielectric resonator 11, but is connected to the external dielectric resonator A31. Alternatively, the coupling slot 40 is connected to the built-in dielectric resonator 11, but is not connected to the external dielectric resonator A31 (this situation is not shown in the figure). In actual applications, the connection relationship between the coupling slot 40 and the built-in dielectric resonator 11 and the external dielectric resonator A31 can be adjusted according to specific needs to adjust the coupling amount between the input port 10 and the built-in dielectric resonator 11 and the external dielectric resonator A31. Figure 12 Taking the example of the coupling slot 40 shown in FIG1 as being disconnected from the built-in dielectric resonator 11 and connected to the external dielectric resonator A31, when the distances between the input port 10 and both the built-in dielectric resonator 11 and the external dielectric resonator A31 are equal, the coupling between the input port 10 and the external dielectric resonator A31 is greater than the coupling between the input port 10 and the built-in dielectric resonator 11. Furthermore, the coupling between the input port 10 and the built-in dielectric resonator 11 can be adjusted by adjusting the distance between the coupling slot 40 and the built-in dielectric resonator 11. The coupling between the input port 10 and the built-in dielectric resonator 11 and the coupling between the input port 10 and the external dielectric resonator A31 can also be adjusted by adjusting the depth and width of the coupling slot 40. Adjusting the coupling between a port and a corresponding dielectric resonator by adjusting the size of the coupling slot 40 is conventional technology and will not be described in detail here.

[0133] Both the internal dielectric resonator 11 and the external dielectric resonator A31 are adjacent to the input port 10. By providing a coupling slot 40 with one end connected to the internal dielectric resonator 11, the coupling between the input port 10 and the internal dielectric resonator 11 can be enhanced. Alternatively, by providing a coupling slot 40 with one end connected to the external dielectric resonator A31, the coupling between the input port 10 and the external dielectric resonator A31 can be enhanced, thereby adjusting the coupling between the input port 10 of the dielectric resonator and either the internal dielectric resonator 11 or the external dielectric resonator. In this embodiment, only the input port 10 is used as an example. The input port 10 can be replaced with the corresponding output port 20. In this case, the internal dielectric resonator 11 corresponds to the internal dielectric resonator adjacent to the output port 20, and the external dielectric resonator A31 corresponds to the external dielectric resonator adjacent to the output port 20.

[0134] Example 3

[0135] A coupling slot 40 is provided between the built-in dielectric resonator and the external dielectric resonator adjacent to the input port 10, or between the built-in dielectric resonator and the external dielectric resonator adjacent to the output port 20. The two ends of the coupling slot 40 are respectively connected to the built-in dielectric resonator located at one end of the coupling slot 40 and the external dielectric resonator located at the other end of the coupling slot 40.

[0136] The following description will be made by taking as an example the case where a coupling slot 40 is provided between the internal dielectric resonator and the external dielectric resonator adjacent to the input port 10. Figure 14 、 Figure 15 , Figure 14 This is a third schematic diagram of coupling between an input port and a built-in dielectric resonator and an external dielectric resonator in a dielectric filter provided in an embodiment of the present application. Figure 15 for Figure 14 The third cross-sectional view of the schematic diagram of the coupling between the port and the built-in dielectric resonator and the external dielectric resonator. Figure 14 、 Figure 15 As shown, the built-in dielectric resonator adjacent to the input port 10 is the built-in dielectric resonator 11, and the external dielectric resonator A31 is adjacent to the input port 10. A coupling slot 40 is provided between the built-in dielectric resonator 11 and the external dielectric resonator A31. The coupling slot 40 is connected to both the built-in dielectric resonator 11 and the external dielectric resonator A31. Under the same arrangement between the input port 10, the built-in dielectric resonator 11, and the external dielectric resonator A31, when the coupling slot 40 is connected to both the built-in dielectric resonator 11 and the external dielectric resonator A31, the coupling between the input port 10 and the built-in dielectric resonator 11 and the external dielectric resonator A31 is greater than when the coupling slot 40 is not connected to either the built-in dielectric resonator 11 or the external dielectric resonator A31. That is, Figure 14 The coupling between the input port 10 and the built-in dielectric resonator 11 and the external dielectric resonator A31 in the case shown is greater than Figure 12 In the illustrated embodiment, the coupling between the input port 10 and the internal dielectric resonator 11 and the external dielectric resonator A31 is adjusted. In this embodiment, the coupling between the input port 10 and the internal dielectric resonator 11 and the coupling between the input port 10 and the external dielectric resonator A31 can be adjusted by adjusting the depth and width of the coupling slot 40.

[0137] By providing two ends of the coupling slot 40 to be connected to the built-in dielectric resonator 11 and the external dielectric resonator A31 respectively, the coupling between the input port 10 and the built-in dielectric resonator 11 and the coupling between the input port 10 and the external dielectric resonator A31 can be increased.

[0138] In addition, a coupling hole 50 may be provided between the built-in dielectric resonator and the external dielectric resonator adjacent to the input port 10 or the output port 20 , and the axis of the coupling hole 50 , the axis of the built-in dielectric resonator, and the axis of the external dielectric resonator are parallel to each other.

[0139] Example 4

[0140] refer to Figure 16 , Figure 16 This is a fourth schematic diagram of the coupling between the input port and the built-in dielectric resonator and the external dielectric resonator in a dielectric filter provided in an embodiment of the present application. Figure 16 As shown, the built-in dielectric resonator adjacent to the input port 10 is the built-in dielectric resonator 11, and the external dielectric resonator adjacent to the input port 10 is the external dielectric resonator A31. A coupling hole 50 is provided between the built-in dielectric resonator 11 and the external dielectric resonator A31. In this example, two coupling holes 50 are provided. The axes of the two coupling holes 50 are parallel to the axes of the built-in dielectric resonator 11 and the external dielectric resonator A31. The axes of the two coupling holes 50 and the axes of the built-in dielectric resonator 11 and the external dielectric resonator A31 can also be provided in the same plane. The two coupling holes 50 are respectively provided on both sides of the input port 10. The coupling holes 50 can be provided as through holes or blind holes, or as a combination of through holes and blind holes. The coupling amount between the input port 10 and the built-in dielectric resonator 11 can be adjusted by adjusting the position of the coupling hole 50 between the input port 10 and the built-in dielectric resonator 11; the coupling amount between the input port 10 and the external dielectric resonator A31 can also be adjusted by adjusting the position of the coupling hole 50 between the input port 10 and the external dielectric resonator A31.

[0141] Example, reference Figure 17 , Figure 17 This is a fifth schematic diagram of the coupling between the input port and the built-in dielectric resonator and the external dielectric resonator in a dielectric filter provided in an embodiment of the present application. Figure 17 As shown, the axes of the two coupling holes 50 are parallel to the axes of the internal dielectric resonator 11 and the external dielectric resonator A31. However, the planes containing the axes of the internal dielectric resonator 11 and the external dielectric resonator A31 are perpendicular to the plane containing the axes of the two coupling holes 50. The two coupling holes 50 are located on either side of the plane containing the axes of the internal dielectric resonator 11 and the external dielectric resonator A31. In practical applications, the specific positions of the coupling holes 50 can be determined based on the coupling strengths between the input port 10 and the internal dielectric resonator 11, as well as the coupling strengths between the input port 10 and the external dielectric resonator A31.

[0142] In addition, the positions of the two coupling holes 50 are set to Figure 17The state shown in FIG. 5 is that the two coupling holes 50 are located on both sides of the plane where the axis of the built-in dielectric resonator 11 and the axis of the external dielectric resonator A31 are located. Figure 16 The axes of the two coupling holes 50 are located in the plane where the axis of the built-in dielectric resonator 11 and the axis of the external dielectric resonator A31 are located. The coupling holes 50 located on both sides of the plane can suppress the parasitic coupling generated between the built-in dielectric resonator 11 and the external dielectric resonator A31, thereby reducing the interference of the parasitic coupling on the realization of the transmission zero point.

[0143] By arranging the axis of the coupling hole 50 to be parallel to the axis of the internal dielectric resonator and the axis of the external dielectric resonator, production and processing are facilitated. The coupling hole 50 in this embodiment can be configured as a through hole or a blind hole, and can be used to adjust the coupling between the input port 10 and the internal dielectric resonator 11, as well as the coupling between the input port 10 and the external dielectric resonator A31.

[0144] Example 5

[0145] In addition to the above examples, the coupling slot 40 and the coupling hole 50 may also be provided simultaneously between the internal dielectric resonator and the external dielectric resonator adjacent to the input port 10 or the output port 20 .

[0146] This example is described by taking the example of setting the coupling slot 40 and the coupling hole 50 between the built-in dielectric resonator and the external dielectric resonator adjacent to the input port 10. Figure 18 、 Figure 19 , Figure 18 This is a sixth schematic diagram of coupling between an input port and a built-in dielectric resonator and an external dielectric resonator in a dielectric filter provided in an embodiment of the present application. Figure 19 for Figure 18 The cross-sectional view of the sixth schematic diagram of the coupling between the port and the built-in dielectric resonator and the external dielectric resonator. Figure 18 、 Figure 19As shown, the internal dielectric resonator adjacent to the input port 10 is the internal dielectric resonator 11, and the external dielectric resonator adjacent to the input port 10 is the external dielectric resonator A31. A coupling slot 40 and a coupling hole 50 are provided between the internal dielectric resonator 11 and the external dielectric resonator A31. In this example, the coupling slot 40 is provided on the side near the external dielectric resonator A31, and the coupling hole 50 is provided on the side near the internal dielectric resonator 11. The positions of the coupling slot 40 and the coupling hole 50 are not limited to this and can be adjusted based on the coupling strength between the input port 10 and the external dielectric resonator A31, and between the input port 10 and the internal dielectric resonator 11. In this example, the coupling slot 40 is connected to the external dielectric resonator A31, but it can also be disconnected depending on the coupling strength between the input port 10 and the external dielectric resonator A31. To facilitate production and processing, the axis of the coupling hole 50 can be set in the vertical direction. The number of coupling holes 50 can be one or more depending on the coupling strength between the input port 10 and the internal dielectric resonator 11.

[0147] In this embodiment, the input port 10 consists of a connector 101 and a port through-hole 100. The connector 101 is connected to the dielectric body, and the port through-hole 100 is a through-hole extending through the connector 101 and the dielectric body. If the connector 101 is of a uniform shape, the port through-hole 100 can be arranged so that the axis of the port through-hole 100 passes through the center of the connector 101. When a coupling slot 40 is provided between the internal dielectric resonator and the external dielectric resonator adjacent to the input port 10, the port through-hole 100 can be arranged so that the port through-hole 100 communicates with the coupling slot 40.

[0148] The above examples simply illustrate the case where a coupling slot 40 and / or coupling hole 50 is provided between the built-in dielectric resonator 11 and the external dielectric resonator A31 at the input port 10. In actual applications, corresponding built-in dielectric resonators and external dielectric resonators can be provided at either the input port 10 or the output port 20, and coupling slots 40 and / or coupling holes 50 can be provided between the built-in dielectric resonator and the external dielectric resonator. The arrangement of the coupling slots 40 and / or coupling holes 50 can be as shown in the above examples. If a coupling slot 40 and / or coupling hole 50 is provided at the input port 10 and a coupling slot 40 and / or coupling hole 50 is also provided at the output port 20, the arrangements in the above examples can also be combined. For example, only a coupling slot 40 is provided at the input port 10, and the positional relationship of the coupling slots 40 is arranged as shown in Example 1, while only a coupling slot 40 is provided at the output port 20, and the positional relationship of the coupling slots 40 is arranged as shown in Example 2. For another example, the input port 10 is provided with only the coupling hole 50, and the positional relationship of the coupling hole 50 is set as shown in Example 4, and the output port 20 is provided with the coupling slot 40 and the coupling hole 50, and the positional relationship of the coupling slot 40 and the coupling hole 50 is set as shown in Example 5. All combinations are not illustrated here one by one.

[0149] In the embodiments of the present application, both the outer and inner surfaces of the dielectric body are metallized. The inner surface of the dielectric body includes all inner surfaces of the through holes provided in the dielectric body, the inner surfaces and bottom surfaces of the blind holes, and the inner surfaces and bottom surfaces of the blind slots. Both the outer and inner surfaces of the dielectric body are metallized to form metal walls on the outer and inner surfaces of the dielectric body. The metal walls completely encase the dielectric body, thereby forming a resonant system within the dielectric body.

[0150] Based on the same inventive concept, one embodiment of the present application provides a transceiver comprising a receiver, a transmitter, an amplification unit, and a dielectric filter as provided in any of the aforementioned embodiments. This transceiver has the same technical effects as the dielectric filter provided in the aforementioned embodiments and is not further described here.

[0151] Based on the same inventive concept, an embodiment of the present application provides a base station, which includes an antenna feed component, a control component, and a transceiver as provided in the above embodiment. This base station has the same technical effects as the transceiver provided in the above embodiment, and will not be described in detail here.

[0152] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0153] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0154] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0155] The above is a detailed introduction to a dielectric filter, a transceiver, and a base station provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A dielectric filter, characterized in that: The device comprises a dielectric body, an input port, an output port, a built-in dielectric resonator, and an external dielectric resonator arranged on the dielectric body, wherein a plurality of the built-in dielectric resonators are arranged between the input port and the output port, and the plurality of the built-in dielectric resonators form a coupled main channel cascade resonator; Two external dielectric resonators are provided on one side of the input port, and the coupling amount between the external dielectric resonator and the input port is greater than the coupling amount between the external dielectric resonator and any of the built-in dielectric resonators; The two external dielectric resonators are coupled, wherein one of the external dielectric resonators close to the input port is a first external dielectric resonator, and the other external dielectric resonator is a second external dielectric resonator; The first external dielectric resonator is coupled to the input port; The first external dielectric resonator is coupled to the input port, and the second external dielectric resonator is coupled to the first external dielectric resonator in a cascade manner; And / or, two external dielectric resonators are provided on one side of the output port, and the coupling amount between the external dielectric resonator and the output port is greater than the coupling amount between the external dielectric resonator and any of the internal dielectric resonators; The two external dielectric resonators are coupled, wherein one of the external dielectric resonators close to the output port is a first external dielectric resonator, and the other external dielectric resonator is a second external dielectric resonator; The first external dielectric resonator is coupled to the output port; The first external dielectric resonator is coupled to the output port, and the second external dielectric resonator is coupled to the first external dielectric resonator in a cascade manner.

2. The dielectric filter according to claim 1, wherein Two external dielectric resonators are provided on one side of the input port, and the angle between a first connecting line and a second connecting line is greater than or equal to 90°; the first connecting line is a line connecting the center of the external dielectric resonator and the center of the input port, and the second connecting line is a line connecting the center of the internal dielectric resonator closest to the input port and the center of the input port; And / or, two external dielectric resonators are provided on one side of the output port, and the angle between a third line and a fourth line is greater than or equal to 90°; the third line is a line connecting the center of the external dielectric resonator and the center of the output port, and the fourth line is a line connecting the center of the built-in dielectric resonator closest to the output port and the center of the output port.

3. The dielectric filter according to claim 1, wherein The coupled main channel cascade resonator includes a cascade resonator with a linear topology structure or a cascade resonator with a staggered topology structure.

4. The dielectric filter according to claim 3, wherein The external dielectric resonator includes a resonator body formed by a portion of the dielectric body and a debugging hole located on the resonator body, and the debugging hole is a blind hole or a through hole.

5. The dielectric filter according to claim 1, wherein The second external dielectric resonator is coupled to a proximal built-in dielectric resonator, and the proximal built-in dielectric resonator is the built-in dielectric resonator adjacent to the port on the side where the second external dielectric resonator is located.

6. The dielectric filter according to any one of claims 1 to 5, characterized in that A coupling hole and / or a coupling slot is provided between the external dielectric resonator and the proximal built-in dielectric resonator. The proximal built-in dielectric resonator is the built-in dielectric resonator adjacent to the port on the side where the external dielectric resonator is located.

7. The dielectric filter according to claim 6, wherein The coupling hole is a blind hole or a through hole.

8. The dielectric filter according to claim 6, wherein The coupling slot is a blind slot.

9. The dielectric filter according to claim 6, wherein Two external dielectric resonators are provided on one side of the input port, a coupling slot is provided between the built-in dielectric resonator adjacent to the input port and the external dielectric resonator, and the coupling slot is not connected to the built-in dielectric resonator located at one end of the coupling slot and the external dielectric resonator located at the other end of the coupling slot; Alternatively, two external dielectric resonators are provided on one side of the output port, and the coupling slot is provided between the built-in dielectric resonator adjacent to the output port and the external dielectric resonator, and the coupling slot is not connected to the built-in dielectric resonator located at one end of the coupling slot and the external dielectric resonator located at the other end of the coupling slot.

10. The dielectric filter according to claim 6, wherein Two external dielectric resonators are provided on one side of the input port, a coupling slot is provided between the internal dielectric resonator adjacent to the input port and the external dielectric resonator, and one end of the coupling slot is connected to the internal dielectric resonator located at one end of the coupling slot or the external dielectric resonator located at the other end of the coupling slot; Alternatively, two external dielectric resonators are provided on one side of the output port, a coupling slot is provided between the built-in dielectric resonator adjacent to the output port and the external dielectric resonator, and one end of the coupling slot is connected to the built-in dielectric resonator located at one end of the coupling slot or the external dielectric resonator located at the other end of the coupling slot.

11. The dielectric filter according to claim 6, wherein Two external dielectric resonators are provided on one side of the input port, a coupling slot is provided between the internal dielectric resonator adjacent to the input port and the external dielectric resonator, and two ends of the coupling slot are respectively connected to the internal dielectric resonator located at one end of the coupling slot and the external dielectric resonator located at the other end of the coupling slot; Alternatively, two external dielectric resonators are provided on one side of the output port, a coupling slot is provided between the built-in dielectric resonator adjacent to the output port and the external dielectric resonator, and both ends of the coupling slot are respectively connected to the built-in dielectric resonator located at one end of the coupling slot and the external dielectric resonator located at the other end of the coupling slot.

12. The dielectric filter according to claim 6, wherein Two external dielectric resonators are provided on one side of the input port, a coupling hole is provided between the internal dielectric resonator adjacent to the input port and the external dielectric resonator, and the axis of the coupling hole, the axis of the internal dielectric resonator, and the axis of the external dielectric resonator are parallel to each other; Alternatively, two external dielectric resonators are provided on one side of the output port, a coupling hole is provided between the built-in dielectric resonator adjacent to the output port and the external dielectric resonator, and the axis of the coupling hole, the axis of the built-in dielectric resonator, and the axis of the external dielectric resonator are parallel to each other.

13. The dielectric filter according to any one of claims 1 to 5, characterized in that: The outer surface and the inner surface of the dielectric body are both metallized.

14. A transceiver, characterized in that: The device comprises a receiver, a transmitter, an amplifying unit and the dielectric filter according to any one of claims 1 to 13.

15. A base station, characterized in that: It comprises an antenna feed component, a control component and the transceiver according to claim 14.

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