Dielectric filter, transceiver, and base station

Abstract

The present application provides a dielectric filter, a transceiver, and a base station to solve the problem of the limited arrangement of the dielectric filter topology and the insufficient out-of-band rejection performance, and further realizes the flexible arrangement of the filter topology and improves the out-of-band rejection performance of the dielectric filter. The dielectric filter includes a dielectric, an input port, an output port, an internal dielectric resonator, and an external dielectric resonator arranged on the dielectric, and a plurality of internal dielectric resonators are arranged between the input port and the output port to form a cascaded coupling resonator of a main coupling channel, and two external dielectric resonators are arranged 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 any of the external dielectric resonator and the internal dielectric resonator, and / or two external dielectric resonators are arranged 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 any of the external dielectric resonator and the internal dielectric resonator.

Description

[Technical field]

[0001] The present application relates to the field of communication device components, and more particularly to dielectric filters, transceivers, and base stations. [Background technology]

[0002] With the rapid development of wireless communication base station equipment, especially the wide range of applications of base stations using 5G massive multiple-input multiple-output (Massive MIMO) technology, dielectric waveguide filters have attracted more attention as an implementation form that is good for miniaturization and integration, and research on them is progressing rapidly in the industry.

[0003] A dielectric filter is usually composed of multiple resonators that are coupled together. Based on the polarity, the coupling between the resonators is classified as inductive coupling (which may be called positive coupling) and capacitive coupling (which may be called negative coupling). Based on the polarity of the coupling between the resonators, a transmission zero may be generated. A transmission zero, also called an attenuation pole or a notch point, is a frequency outside the passband of a filter, at which the rejection of signals at that frequency is theoretically infinite.

[0004] In prior art dielectric filters, the transmission zero function of the dielectric filter is usually implemented by adding cross-couplings to the main transmission channel of the dielectric filter, however this can lead to complex construction and out-of-band rejection. Summary of the Invention

[0005] The embodiments of the present application provide a dielectric filter, a transceiver, and a base station to solve the problem of insufficient out-of-band rejection performance of the dielectric filter, and improve the out-of-band rejection performance of the dielectric filter. [Means for solving the problem]

[0006] In order to achieve the aforementioned objectives, the present application employs the following technical solutions:

[0007] According to a first aspect, a dielectric filter is provided. The dielectric filter includes a dielectric, and an input port, an output port, an internal dielectric resonator, and an external dielectric resonator arranged on the dielectric. A plurality of internal dielectric resonators are arranged between the input port and the output port to form a cascaded coupled resonator of a main coupling channel. Two external dielectric resonators are arranged on one side of the input port, and a coupling amount between the external dielectric resonator and the input port is greater than a coupling amount between either of the external dielectric resonator and the internal dielectric resonator, and / or two external dielectric resonators are arranged on one side of the output port, and a coupling amount between the external dielectric resonator and the output port is greater than a coupling amount between either of the external dielectric resonator and the internal dielectric resonator.

[0008] The internal dielectric resonator is configured to transmit a high-frequency signal. A plurality of internal dielectric resonators may be arranged. The specific number of internal dielectric resonators to be arranged depends on factors such as the transmission requirements of the high-frequency signal and the size of the dielectric filter. The plurality of internal dielectric resonators arranged between the input port and the output port are coupled to form a main coupling channel, along which the high-frequency signal is transmitted. Two external dielectric resonators are arranged 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 internal dielectric resonators. Alternatively, two external dielectric resonators are arranged 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. In this way, a pair of transmission zero points may be obtained, and the two transmission zero points are respectively arranged on both sides of the passband of the dielectric filter. When the aforementioned condition is met and two external dielectric resonators are arranged on one side of the input port and one side of the output port, two pairs of transmission zero points may be obtained. One side of the input port or the output port in some embodiments is either side of the input port or the output port. Since the amount of coupling between the external dielectric resonator and the input port or the output port needs to be larger than the amount of coupling between the external dielectric resonator and either the internal dielectric resonator, it is preferable that the internal dielectric resonator and the external dielectric resonator are disposed on both sides of the input port or the output port, respectively. Two transmission zeros can be implemented by adding two external dielectric resonators outside the input port or the output port, thereby improving the out-of-band rejection performance of the dielectric filter. In addition, since both the cascaded coupled resonators of the staggered topology structure and the cascaded coupled resonators of the linear topology structure can be used, the internal arrangement of the dielectric filter can be flexibly set. Therefore, the dielectric filter has a simple structure, good reliability and cost-effectiveness, is moldable, and is convenient for mass production.

[0009] In one possible implementation of the first aspect, the included angle between the first and second rails is 90° or more and / or the included angle between the third and fourth rails is 90° or more.

[0010] The first line is a line between the center of the external dielectric resonator and the center of the input port. The second line is a line between the center of the internal dielectric resonator closest to the input port and the center of the input port. The third line is a line between the center of the external dielectric resonator and the center of the output port. The fourth line is a line between the center of the internal 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 line and the second line and the angle between the third line and the fourth line, and the coupling amount between the external dielectric resonator and the input port or the output port can be made larger than the coupling amount between the external dielectric resonator and any internal dielectric resonator. In this way, one pair of transmission zero points or two pairs of transmission zero points can be obtained.

[0012] In one possible implementation of the first aspect, two external dielectric resonators are coupled, one of the external dielectric resonators close to the input port or the output port is a first external dielectric resonator, and the other external dielectric resonator is a second external dielectric resonator, and the first external dielectric resonator is coupled to the input port or the output port. In this case, the first external dielectric resonator is coupled to the input port or the output port in a cascaded manner, and the second external dielectric resonator is coupled to the first external dielectric resonator. This contributes to implementing a flexible arrangement of the external dielectric resonators, and such a design makes it easy to obtain transmission zeros.

[0013] In one possible implementation of the first aspect, the cascaded resonators of the main coupling channel include a cascaded resonator of a linear topology structure and a cascaded resonator of a staggered topology structure. In this case, the structural design of the dielectric filter can be simplified by using the cascaded resonators of a linear topology structure in which multiple dielectric resonators can be arranged in a straight line. The structure is simple, and the arrangement of the dielectric filter is convenient. Cross-coupling can be generated between multiple adjacent internal dielectric resonators in the cascaded resonators of the staggered topology structure. The cross-coupling is useful for implementing the transmission zero point function of the dielectric filter, and the out-of-band rejection performance of the dielectric filter is improved by generating a transmission zero point by arranging an external dielectric resonator.

[0014] When the cascaded coupled resonator of the main coupling channel is a nonlinear cascaded coupled resonator, a first coupling groove is disposed between two adjacent internal dielectric resonators. In this case, the amount of dielectric between the two adjacent internal dielectric resonators may be controlled by disposing the first coupling groove. The amount of dielectric may be controlled by controlling the size of the first coupling groove, whereby the amount of coupling between the two internal dielectric resonators may be controlled. By controlling the amount of coupling between the internal dielectric resonators, the formation of the main coupling channel is controlled. The cascaded coupled resonator of the main coupling channel may be in different forms. In practical application, the arrangement of the cascaded coupled resonator of the main coupling channel may be flexibly adjusted, which makes it generally easier to arrange the dielectric filter.

[0015] In one possible implementation of the first aspect, the external dielectric resonator includes a resonator body defined by a portion of the dielectric and a debug hole disposed in the resonator body. The debug hole is a blind hole or a through hole. In this case, by making the debug hole a blind hole or a through hole, the design freedom of the external dielectric resonator can be maintained.

[0016] In the embodiment of the present application, the shape of the first coupling groove is related to the amount of coupling between the internal dielectric resonators in the cascaded coupled resonators of the staggered topology structure. The first coupling groove may be used to control the amount of coupling between the two internal dielectric resonators by controlling the amount of dielectric between the two internal dielectric resonators, so that the amount of dielectric between each internal dielectric resonator may be determined by setting the amount of coupling between the two internal dielectric resonators, and thus the corresponding shape of the first coupling groove may be determined.

[0017] In one possible implementation of the first aspect, the second external dielectric resonator is coupled to the internal dielectric resonator near the port, and the internal dielectric resonator near the port is an internal dielectric resonator adjacent to the port on the side where the second external dielectric resonator is located. In this case, the first external dielectric resonator is coupled to the input port or the output port, the input port is coupled to the adjacent internal dielectric resonator, and the output port is coupled to the adjacent internal dielectric resonator. The second external dielectric resonator is further coupled to the internal dielectric resonator near the port. Thus, the arrangement of the filter topology may be a staggered arrangement when the external dielectric resonator is further coupled to the internal dielectric resonator near the port. Specifically, the two external dielectric resonators and the internal dielectric resonator near the port are arranged in a triangular shape. This arrangement makes it easier for cross-coupling to occur between the two external dielectric resonators and the internal dielectric resonator near the port, resulting in a better out-of-band rejection effect.

[0018] In one possible implementation of the first aspect, a coupling hole and / or coupling groove is arranged between the external dielectric resonator and the internal dielectric resonator near the port, the internal dielectric resonator near the port being the internal dielectric resonator adjacent to the port on the side where the external dielectric resonator is arranged.

[0019] In this case, by arranging the coupling hole or the second coupling groove, the amount of coupling between the input port and the internal dielectric resonator and the external dielectric resonator arranged on both sides of the input port, or the amount of coupling between the output port and the internal dielectric resonator and the external dielectric resonator arranged on both sides of the output port may be adjusted using the arranged coupling hole or the second coupling groove. The coupling hole and the second coupling groove are different forms of mechanisms for adjusting the amount of coupling between the input port and the internal dielectric resonator and the external dielectric resonator, and adjusting the amount of coupling between the output port and the internal dielectric resonator and the external dielectric resonator. In practical applications, the corresponding coupling hole or the second coupling groove may be designed according to the requirement of the amount of coupling between the input port or the output port and the internal dielectric resonator and the external dielectric resonator. By using the coupling hole and the second coupling groove in combination, various designs and flexible adjustments to the amount of coupling between the internal dielectric resonator and the external dielectric resonator may be implemented.

[0020] In one possible implementation of the first aspect, the coupling holes are blind holes or through holes, and the second coupling grooves are blind grooves. In this case, the coupling holes are set as through holes or blind holes, and the effect of adjusting the amount of coupling between the input or output port and the dielectric resonator of the corresponding port by using the through holes is different from the effect brought about by using the blind holes. Whether to use the through holes or the blind holes depends on the requirement of adjusting the amount of coupling. In this way, the amount of coupling between the input or output port and each dielectric resonator is more easily adjusted. This simple adjustment method makes the dielectric filter easier to manufacture and process.

[0021] In one possible implementation of the first aspect, the second coupling groove is disposed between the internal dielectric resonator and the external dielectric resonator adjacent to the input port or the output port, and the second coupling groove is not in communication with either the internal dielectric resonator disposed at one end of the second coupling groove or the external dielectric resonator disposed at the other end of the second coupling groove.

[0022] In this case, both the internal dielectric resonator and the external dielectric resonator are adjacent to the input port, or both are adjacent to the output port. Since the second coupling groove is designed not to communicate with either the internal dielectric resonator or the external dielectric resonator, the coupling amount between the input port and the internal dielectric resonator and the coupling amount between the input port and the external dielectric resonator can be small, and / or the coupling amount between the output port and the internal dielectric resonator and the coupling amount between the output port and the external dielectric resonator can be small.

[0023] In one possible implementation of the first aspect, the second coupling groove is disposed between the internal dielectric resonator and the external dielectric resonator adjacent to the input port or the output port, and one end of the second coupling groove is in communication with the internal dielectric resonator disposed at one end of the second coupling groove or the external dielectric resonator disposed at the other end of the second coupling groove.

[0024] In this case, both the internal and external dielectric resonators are adjacent to the input port or the output port. By configuring one end of the second coupling groove to communicate with the internal dielectric resonator arranged at one end of the second coupling groove or the external dielectric resonator arranged at one end of the second coupling groove, the coupling amount between the input port or the output port and the internal dielectric resonator or the external dielectric resonator that communicates with one end of the second coupling groove may be increased, while the coupling amount between the input port or the output port and the internal dielectric resonator or the external dielectric resonator that does not communicate with the second coupling groove is reduced. In this way, by using the dielectric resonator, the coupling amount between the input port or the output port and the internal dielectric resonator or the external dielectric resonator is adjusted.

[0025] In one possible implementation of the first aspect, the second coupling groove is arranged between the internal dielectric resonator and the external dielectric resonator adjacent to the input port or the output port, and the two ends of the second coupling groove are respectively connected to the internal dielectric resonator arranged at one end of the second coupling groove or the external dielectric resonator arranged at the other end of the second coupling groove.

[0026] In this case, both the internal dielectric resonator and the external dielectric resonator are adjacent to the input port, or both are adjacent to the output port. Since the two ends of the second coupling groove are respectively connected to the internal dielectric resonator disposed at one end of the second coupling groove and the external dielectric resonator disposed at the other end of the second coupling groove, the coupling amount between the input port and the internal dielectric resonator and the coupling amount between the input port and the external dielectric resonator can be increased, and / or the coupling amount between the output port and the internal dielectric resonator and the coupling amount between the output port and the external dielectric resonator can be increased.

[0027] In one possible implementation of the first aspect, the coupling hole is disposed between the internal and external dielectric resonators adjacent to the input or output port, 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.

[0028] In this case, the axis of the coupling hole may be parallel to the axis of the internal dielectric resonator and the axis of the external dielectric resonator, which may facilitate manufacturing and processing. Furthermore, the distance between the axis of the coupling hole and the axis of the internal dielectric resonator may be adjusted to adjust the amount of coupling between the input port or the output port and the internal dielectric resonator, or the distance between the axis of the coupling hole and the axis of the external dielectric resonator may be adjusted to adjust the amount of coupling between the input port or the 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 are metallized. The inner surface of the dielectric includes all inner surfaces of the through holes, the inner and bottom surfaces of the blind holes, and the inner and bottom surfaces of the blind grooves provided in the dielectric. By metallizing the outer and inner surfaces of the dielectric, metal walls can be formed on the outer and inner surfaces of the dielectric. In this way, a resonant system can be formed in the dielectric.

[0030] According to a second aspect, there is provided a transceiver, including a receiver, a transmitter, an amplifying unit, and a dielectric filter provided in the first aspect or any one of the possible implementations of the first aspect. The transceiver and the dielectric filter provided in the previous embodiments have the same technical effect, so they will not be described in detail again here.

[0031] According to a third aspect, a base station is provided, including the antenna feeder component, the control component, and the transceiver provided in the second aspect. The base station and the transceiver provided in the previous embodiment have the same technical effect, so the details are not described again here. [Brief description of the drawings]

[0032] [Figure 1] FIG. 2 is a first schematic diagram of a dielectric filter according to an embodiment of the present application. [Diagram 2] FIG. 2 is a second schematic diagram of a dielectric filter according to an embodiment of the present application. [Diagram 3] FIG. 3 is a schematic diagram of the topology structure of the dielectric filter shown in FIGS. 1 and 2. [Figure 4] 2 is a response curve of the dielectric filter shown in FIG. 1. [Diagram 5] FIG. 2 is a schematic diagram of a topology structure according to an embodiment of the present application; [Figure 6] FIG. 6 is a diagram of an equivalent circuit having an input impedance of the topology structure shown in FIG. 5. [Figure 7] FIG. 13 is a third schematic diagram of a dielectric filter according to an embodiment of the present application. [Figure 8] FIG. 8 is a schematic diagram of the topology structure of the dielectric filter shown in FIG. 7. [Figure 9] 8 is a response curve of the dielectric filter shown in FIG. 7. [Figure 10] FIG. 2 is a first schematic diagram illustrating coupling between an input port and an internal and external dielectric resonator in a dielectric filter according to an embodiment of the present application. [Figure 11]FIG. 11 is a cross-sectional view of a first schematic diagram illustrating coupling of the port of FIG. 10 with an internal dielectric resonator and an external dielectric resonator. [Figure 12] FIG. 2 is a second schematic diagram illustrating the coupling of an input port with an internal dielectric resonator and an external dielectric resonator in a dielectric filter according to an embodiment of the present application. [Figure 13] FIG. 13 is a cross-sectional view of a second schematic diagram illustrating coupling of the port of FIG. 12 with an internal dielectric resonator and an external dielectric resonator. [Figure 14] FIG. 11 is a third schematic diagram illustrating coupling between an input port and an internal and external dielectric resonator in a dielectric filter according to an embodiment of the present application. [Figure 15] FIG. 15 is a cross-sectional view of a third schematic diagram illustrating coupling of the port of FIG. 14 with an internal dielectric resonator and an external dielectric resonator. [Figure 16] FIG. 4 is a fourth schematic diagram illustrating coupling between an input port and an internal and external dielectric resonator in a dielectric filter according to an embodiment of the present application. [Figure 17] FIG. 5 is a fifth schematic diagram illustrating coupling between an input port and an internal and external dielectric resonator in a dielectric filter according to an embodiment of the present application. [Figure 18] FIG. 6 is a sixth schematic diagram showing coupling between an input port and an internal and external dielectric resonator in a dielectric filter according to an embodiment of the present application. [Figure 19] FIG. 19 is a cross-sectional view of a sixth schematic diagram illustrating coupling of the port of FIG. 18 with an internal dielectric resonator and an external dielectric resonator. [Figure 20] FIG. 4 is a fourth schematic diagram of a dielectric filter according to an embodiment of the present application. [Figure 21] FIG. 21 is a schematic diagram of the topology structure of the dielectric filter shown in FIG. 20. [Figure 22] FIG. 5 is a fifth schematic diagram of a dielectric filter according to an embodiment of the present application. [Figure 23] FIG. 23 is a schematic diagram of the topology structure of the dielectric filter shown in FIG. 22. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] The technical solutions in this application are described below with reference to the accompanying drawings.

[0034] In the embodiments of the present application, words such as "example" and "for example" are used to provide an example, illustration, or explanation. Any embodiment or design solution described using "example" or "for example" in the embodiments of the present application should not be construed as preferred or more advantageous over another embodiment or design solution. Strictly speaking, the use of words such as "example" and "for example" is intended to present the relevant concept in a concrete manner.

[0035] In the embodiments of the present application, subscript letters such as W1 may be erroneously written in a non-subscript form such as W1. When the difference is not emphasized, W1 and W1 have the same meaning.

[0036] In the embodiments of the present application, the terms "first", "second", "third", and "fourth" are used merely for descriptive purposes and cannot be understood to imply or suggest the relative importance or quantity of the indicated technical features. Thus, a feature defined by "first", "second", "third", or "fourth" may explicitly or implicitly include one or more features.

[0037] It is to be understood that the terminology used to describe the various examples in this application is intended merely to describe specific examples 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 unless the context clearly indicates otherwise.

[0038] In this application, "at least one" refers to one or more, and "multiple" refers to two or more. "At least one of the following items (moieties)" or similar phrases refers to any combination of these items (moieties), including any combination of single items (moieties) or multiple items (moieties). For example, at least one of a, b, or c may represent a, b, or c, a and b, a and c, b and c, or a, b, and c, where a, b, and c may be singular or plural.

[0039] It should also be understood that the term "and / or" used herein refers to and encompasses any or all possible combinations of one or more associated listed items. The term "and / or" indicates an association relationship that describes associated objects, and indicates that three relationships may exist. For example, A and / or B may indicate that only A is present, that both A and B are present, and that only B is present. In addition, the character " / " in this specification generally indicates that the associated objects are in an "or" relationship.

[0040] It should be understood that determining B based on A does not mean that B is determined based only on A, but that B may be determined based on A and / or other information.

[0041] It is also to be understood that the term "include" (also used as "includes," "including," "comprise," and / or "comprising") as used herein indicates the presence of stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0042] As used throughout this specification, "one embodiment," "one embodiment," and "one possible implementation" should be understood to mean that a particular feature, structure, or characteristic associated with an embodiment or implementation is included in at least one embodiment of the application. Thus, "one embodiment," "one embodiment of the application," or "one possible implementation" as used throughout this specification do not necessarily refer to the same embodiment. Furthermore, particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0043] Please refer to Fig. 1. Fig. 1 is one of schematic diagrams of a dielectric filter according to an embodiment of the present application. As shown in Fig. 1, the dielectric filter includes a dielectric, an input port 10, an output port 20, an internal dielectric resonator, and an external dielectric resonator disposed on the dielectric. A number of internal dielectric resonators are disposed between the input port 10 and the output port 20, forming a cascaded coupled resonator of a main coupling channel. Two external dielectric resonators are disposed outside the input port 10 and / or outside the output port 20.

[0044] In the embodiment of the present application, the outside of the input port 10 is the side opposite to the side of the input port 10 facing the output port 20, and the outside of the output port 20 is the side opposite to the side facing the input port 10. The cascaded coupled resonator of the main coupling channel includes a plurality of internal dielectric resonators cascaded together. Among the plurality of internal dielectric resonators, a channel formed by continuously coupling channels having a strong coupling effect between two adjacent internal dielectric resonators is the main coupling channel. As shown in FIG. 7, the main coupling channels between the internal dielectric resonators 11, 12, 13, and 14 are indicated by dashed lines in FIG. 7.

[0045] Based on this, an internal dielectric resonator is arranged between the input port 10 and the output port 20. The internal dielectric resonator is configured to transmit a high-frequency signal. A plurality of internal dielectric resonators may be arranged. The specific number of internal dielectric resonators to be arranged depends on factors such as the transmission requirements of the high-frequency signal and the size of the dielectric filter. The plurality of internal dielectric resonators arranged between the input port 10 and the output port 20 are coupled to form a main coupling channel, along which the high-frequency signal is transmitted. By arranging two external dielectric resonators on the outside of the input port 10 or the output port 20, a pair of transmission zero points can be obtained, and the two transmission zero points are respectively arranged on both sides of the passband of the present filter. If two external dielectric resonators are arranged on the outside of both the input port 10 and the output port 20, two pairs of transmission zero points can be obtained.

[0046] The two transmission zeros can be implemented by adding two external dielectric resonators outside the input port 10 or the output port 20 without being affected by the arrangement of the filter topology of the internal dielectric resonators, thereby improving the out-of-band rejection performance of the dielectric filter. In addition, both the cascaded coupled resonators with staggered topology structure and the cascaded coupled resonators with linear topology structure can be used, so that the internal dielectric resonators can be flexibly arranged inside the dielectric filter. Therefore, the dielectric filter has a simple structure, good reliability, cost-effectiveness, is moldable, and is convenient for mass production.

[0047] The specific number of internal dielectric resonators to be arranged depends on the actual functional requirements of the dielectric filter. For example, see FIG. 1 and FIG. 3. FIG. 1 is a first schematic diagram of a dielectric filter according to an embodiment of the present application. FIG. 3 is a schematic diagram of the topology structure of the dielectric filter shown in FIG. 1. As shown in FIG. 1 and FIG. 3, four internal dielectric resonators are arranged, including an internal dielectric resonator 11, an internal dielectric resonator 12, an internal dielectric resonator 13, and an internal dielectric resonator 14. The internal dielectric resonator 11 is coupled to the input port 10. The internal dielectric resonator 12 is coupled to the internal dielectric resonator 11. The internal dielectric resonator 13 is coupled to the internal dielectric resonator 12. The internal dielectric resonator 14 is coupled to the internal dielectric resonator 13. The output port 20 is coupled to the internal dielectric resonator 14. In this case, a high-frequency signal is transmitted through the internal dielectric resonator 11, the internal dielectric resonator 12, the internal dielectric resonator 13, and the internal dielectric resonator 14, i.e., in the direction indicated by the arrow in FIG. 1. This pathway is the main binding channel.

[0048] In the following description, a principle of generating a transmission zero point by arranging two external dielectric resonators outside the input port 10 and / or outside the output port 20 will be described. In this embodiment, an example in which two external dielectric resonators are arranged outside the input port 10 will be described.

[0049] Please refer to Fig. 5 and Fig. 6. Fig. 5 is a schematic diagram of a topology structure according to an embodiment of the present application. Fig. 6 is a diagram of an equivalent circuit with input impedance of the topology structure shown in Fig. 5. In the circuit topology shown in Fig. 5, the external dielectric resonator 1 and the external dielectric resonator 2 in the diagram form a series-coupled removal resonator, which brings about a transmission zero point in the entire link. For the conventional out-of-band zero cavity resonator, non-resonant node, and removal resonator, the resonant frequency of the conventional NRN redundant resonator is located at the transmission zero point. Meanwhile, the resonant frequency of the series-coupled external dielectric resonator 1 and the external dielectric resonator 2 in the circuit topology shown in Fig. 5 is located at the center of the passband of the filter. In order to analyze the mechanism that generates the transmission zero point, we first consider the input admittance Y inis calculated.

number

[0050] Here, the input impedance Z in would be as follows:

number

[0051] Y in As it approaches infinity, that is, Z in When approaches 0 (Z in =0), a transmission zero point is generated. in If is equal to 0, a reflection zero is generated. In this case, the obtained transmission zero S z teeth,

number

[0052] In the above equation, b1 is the frequency coefficient of the external dielectric resonator 1, b2 is the frequency coefficient of the external dielectric resonator 2, j is the imaginary unit of a complex number, J1 is the coupling coefficient between the external dielectric resonator 1 and the input port 10, and J2 is the coupling coefficient between the external dielectric resonator 1 and the external dielectric resonator 2.

[0053] Therefore, when the transmission zero points are distributed symmetrically, both the external dielectric resonator 1 and the external dielectric resonator 2 resonate at the center frequency, and b1 = b2 = 0. In this case, S z = ±jJ2, and S p =0.

[0054] Based on the above analysis, the following conclusions can be drawn:

[0055] (1) A pair of out-of-band transmission zero points may be implemented for the topology structure, and the pair of out-of-band transmission zero points may be symmetrical transmission zero points symmetrically distributed on both sides of the passband, or asymmetrical transmission zero points located on both sides of the passband.

[0056] (2) J2 can affect the position of the transmission zero point.

[0057] (3) J1 provides coupling only and does not affect the position of the transmission zero.

[0058] If the transmission zeros are distributed symmetrically on both sides of the passband, then the external dielectric resonator 1 and the external dielectric resonator 2 result in two reflection zeros located at the center frequency.

[0059] In this embodiment of the present application, the included angle between the first line and the second line is 90° or more, and / or the included angle between the third line and the fourth line is 90° or more.

[0060] The first line is a line connecting the center of the external dielectric resonator and the center of the input port. The second line is a line connecting the center of the input port and the center of the internal dielectric resonator closest to the input port. The third line is a line connecting the center of the output port and the center of the external dielectric resonator. The fourth line is a line connecting the center of the output port and the center of the internal dielectric resonator closest to the output port.

[0061] The angle between the first line and the second line is set to 90° or more, so that the internal and external dielectric resonators are disposed on both sides of the input port. In this embodiment of the present application, the side where the internal dielectric resonator is disposed is defined as the inside of the input port, and the other side is defined as the outside of the input port. The boundary between the inside and outside of the input port is a straight line that passes through the center of the input port and is perpendicular to the second line. The center of the external dielectric resonator may be located on the boundary line or outside the input port. By setting the position of the external dielectric resonator, the external dielectric resonator always passes through the input port when directly coupled to the internal dielectric resonator, and becomes part of the cascade-coupled resonator of the main coupling channel. In this way, the transmission path of the wave passes through the input port and reaches the external dielectric resonator, where a transmission zero point is generated.

[0062] The angle between the third line and the fourth line is set to 90° or more, so that the internal dielectric resonator and the external dielectric resonator are disposed on both sides of the output port, respectively. In this embodiment of the present application, the side where the internal dielectric resonator is disposed is defined as the inside of the output port, and the other side is defined as the outside of the output port. The boundary line between the inside and outside of the output port is a straight line that passes through the center of the output port and is perpendicular to the fourth line. The center of the external dielectric resonator may be located on the boundary line or may be located outside the output port. By setting the position of the external dielectric resonator, the external dielectric resonator always passes through the output port when directly coupled to the internal dielectric resonator, and becomes part of the cascade-coupled resonator of the main coupling channel. In this way, the transmission path of the wave passes through the output port and reaches the external dielectric resonator, where a transmission zero point is generated.

[0063] In this embodiment of the present application, two external dielectric resonators are coupled, and the external dielectric resonator close to the input port 10 or the output port 20 is coupled to the input port 10 or the output port 20. It will be understood that one of the external dielectric resonators is coupled to the input port 10 or the output port 20 via cascade coupling. Such a design follows the theoretical basis for obtaining the transmission zeros mentioned above and makes it easy to obtain the transmission zeros.

[0064] In this embodiment, an external dielectric resonator and an external dielectric resonator are arranged outside the input port 10, and an external dielectric resonator and an external dielectric resonator are also arranged outside the output port 20. Therefore, for ease of explanation and identification, the external dielectric resonator that is close to the input port 10 and outside the input port 10 is referred to as an external dielectric resonator A31, the other external dielectric resonator outside the input port 10 is referred to as an external dielectric resonator A32, the external dielectric resonator that is outside the output port 20 and close to the output port 20 is referred to as an external dielectric resonator B21, and the other external dielectric resonator that is outside the output port 20 and close to the output port 20 is referred to as an external dielectric resonator B22.

[0065] In this embodiment of the present application, the cascaded resonators of the main coupling channel include a cascaded resonator of a linear topology structure and a cascaded resonator of a staggered topology structure. When using the cascaded resonators of a linear topology structure, the structural design of the dielectric filter can be simplified by arranging multiple internal dielectric resonators in a straight line, and the structure is simple and the dielectric filter is easy to arrange. When using the cascaded resonators of a staggered topology structure, cross-coupling is provided by multiple adjacent internal dielectric resonators, and the cross-coupling facilitates the implementation of the transmission zero point function in the dielectric filter. In addition, the transmission zero point obtained by arranging the external dielectric resonator contributes to improving the out-of-band rejection performance of the dielectric filter.

[0066] Next, specific arrangements of the cascade-coupled resonators in a linear topology structure and the cascade-coupled resonators in a staggered topology structure will be described individually.

[0067] Example 1 In this embodiment, reference is made to Fig. 2 and Fig. 3. Fig. 2 is a second schematic diagram of a dielectric filter according to an embodiment of the present application. Fig. 3 is a schematic diagram of the topology structure of the dielectric filter shown in Fig. 2. As shown in Fig. 2 and Fig. 3, a plurality of internal dielectric resonators are arranged between an input port 10 and an output port 20. The plurality of internal dielectric resonators are arranged in a line, and the input port 10 and the output port 20 are also arranged in a line. In this embodiment, a total of four internal dielectric resonators are arranged. The internal dielectric resonator 11 is coupled to the input port 10. The internal dielectric resonator 12 is coupled to the internal dielectric resonator 11. The internal dielectric resonator 13 is coupled to the internal dielectric resonator 12. The internal dielectric resonator 14 is coupled to the internal dielectric resonator 13. The output port 20 is coupled to the internal dielectric resonator 14. In this case, a linear main coupling channel is formed. A high-frequency signal is transmitted from the input port 10 to the output port 20 along the main coupling channel. As shown in Fig. 2, two external dielectric resonators, an external dielectric resonator B21 and an external dielectric resonator B22, are arranged outside the output port 20. The external dielectric resonator B21 is coupled to the output port 20. The external dielectric resonator B22 is coupled to the external dielectric resonator B21. The external dielectric resonator B21 and the external dielectric resonator B22 may be arranged on the straight line on which the four internal dielectric resonators are arranged. In this arrangement, cross-coupling between the internal dielectric resonators is not taken into consideration, so that the structure of the dielectric filter is simple, which makes it easy to manufacture and is favorable for mass production.

[0068] Example 2 In this embodiment, reference is made to Fig. 1 and Fig. 3. Fig. 1 is a first schematic diagram of a dielectric filter according to an embodiment of the present application. Fig. 3 is a schematic diagram of the topology structure of the dielectric filter shown in Fig. 1. As shown in Fig. 1 and Fig. 3, a plurality of internal dielectric resonators may be arranged between an input port 10 and an output port 20, and the plurality of internal dielectric resonators may be arranged in a plurality of rows. By applying this arrangement, it is easy to arrange the dielectric filter, and the space in the longitudinal direction of the dielectric filter can be utilized to the maximum. Meanwhile, the plurality of internal dielectric resonators form only one main coupling channel. In this embodiment, a total of four internal dielectric resonators are arranged in two rows, and each row includes two internal dielectric resonators. As shown in Fig. 1, the four internal dielectric resonators are respectively arranged at the four corners of a rectangle. Of course, the arrangement of the plurality of internal dielectric resonators is not limited to this. The internal dielectric resonator 11 is coupled to the input port 10. The internal dielectric resonator 12 is coupled to the internal dielectric resonator 11. The internal dielectric resonator 13 is coupled to the internal dielectric resonator 12. The internal dielectric resonator 14 is coupled to the internal dielectric resonator 13. The output port 20 is coupled to the internal dielectric resonator 14. In this case, a "U"-shaped main coupling channel is formed. A high-frequency signal is transmitted from the input port 10 to the output port 20 along the main coupling channel. As shown in FIG. 1, two external dielectric resonators, an external dielectric resonator B21 and an external dielectric resonator B22, are arranged outside the output port 20. The external dielectric resonator B21 is coupled to the output port 20. The external dielectric resonator B22 is coupled to the external dielectric resonator B21. The arrangement of the external dielectric resonator B21 and the external dielectric resonator B22 may be based on the structure of the dielectric filter. In this embodiment, the arrangement of the two external dielectric resonators is similar to the vertical arrangement of the internal dielectric resonator. The arrangement of this embodiment makes maximum use of the space of the dielectric filter.

[0069] The two external dielectric resonators are arranged outside the output port 20, so that two transmission zero points are generated, and as a result, a good out-of-band rejection effect is obtained. Please refer to FIG. 4. FIG. 4 is the response curve of the dielectric filter shown in FIG. 1. As shown in FIG. 4, there are a total of two curves in the figure. The curve S11 is the signal reflection curve of the signal transmission in the dielectric filter in this embodiment, and the curve S21 is the signal transmission curve of the signal transmission in the dielectric filter in this embodiment. The relatively small fluctuation part in the center of the curve S11 represents the passband of the cascaded coupled resonators of the main coupling channel in the dielectric filter in this embodiment. The two breakpoints on S21 represent two transmission zero points, and these two transmission zero points are distributed on both sides of the passband.

[0070] Example 3 In this embodiment, reference is made to FIG. 7 and FIG. 8. FIG. 7 is a third schematic diagram of a dielectric filter according to an embodiment of the present application. FIG. 8 is a schematic diagram of the topology structure of the dielectric filter shown in FIG. 7. As shown in FIG. 7 and FIG. 8, a plurality of internal dielectric resonators may be arranged between the input port 10 and the output port 20. The arrangement of the plurality of internal dielectric resonators in this embodiment is similar to the arrangement of the internal dielectric resonators in the second embodiment, so the details will not be described again here. For details, please refer to the description of the arrangement of the internal dielectric resonators in the second embodiment. The four internal dielectric resonators form a "U"-shaped main coupling channel, and a high-frequency signal is transmitted from the input port 10 to the output port 20 along the "U"-shaped main coupling channel. As shown in FIG. 7 and FIG. 8, two external dielectric resonators, an external dielectric resonator A31 and an external dielectric resonator A32, are arranged outside the input port 10. The external dielectric resonator A31 is coupled to the input port 10, and the external dielectric resonator A32 is coupled to the external dielectric resonator A31. Two external dielectric resonators, an external dielectric resonator B21 and an external dielectric resonator B22, are arranged outside the output port 20. 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 arrangement of the two external dielectric resonators at the input port 10 may be the same as the arrangement of the two external dielectric resonators at the output port 20. For details, please refer to the arrangement of the two external dielectric resonators outside the output port 20 in the second embodiment.

[0071] Two external dielectric resonators are arranged outside the input port 10, and two external dielectric resonators are arranged outside the output port 20, so that four transmission zero points are generated, and a good out-of-band rejection effect is obtained. Please refer to FIG. 9. FIG. 9 is the response curve of the dielectric filter shown in FIG. 7. As shown in FIG. 9, there are a total of two curves in the figure. The curve S11 is the reflection curve of the signal transmission in the dielectric filter in this embodiment, and the curve S21 is the transmission curve of the signal transmission in the dielectric filter in this embodiment. The part with a relatively small fluctuation in the center of the curve S11 represents the passband of the cascaded coupled resonators of the main coupling channel in the dielectric filter in this embodiment. S21 has a total of four breakpoints, each of which represents a transmission zero point. The four breakpoints are approximately symmetrically distributed on both sides of the passband.

[0072] Example 4 In this embodiment, reference is made to Fig. 20 and Fig. 21. Fig. 20 is a fourth schematic diagram of a dielectric filter according to an embodiment of the present application. Fig. 21 is a schematic diagram of the topology structure of the dielectric filter shown in Fig. 20. As shown in Fig. 20 and Fig. 21, a plurality of internal dielectric resonators are arranged between the input port 10 and the output port 20, and these multiple internal dielectric resonators are arranged in a staggered manner. Note that the solid line between the internal dielectric resonators in Fig. 21 represents a main coupling channel, and the dashed line indicates that the internal dielectric resonators at both ends of the dashed line are coupled to each other, or that the internal dielectric resonator at one end of the dashed line is also coupled to the external dielectric resonator at the other end. The internal dielectric resonator 11, the internal dielectric resonator 12, and the internal dielectric resonator 13 are used as examples for explanation.

[0073] The coupling paths between the internal dielectric resonators 11 and 12 and the coupling paths between the internal dielectric resonators 12 and 13 are part of the main coupling channel. In FIG. 21, the aforementioned coupling paths are shown by solid lines. The internal dielectric resonators 11 and 13 are also coupled. The coupling path between the internal dielectric resonators 11 and 13 is shown by dashed lines since it is not part of the main coupling channel. In this way, the internal dielectric resonators 11, 12, and 13 are cross-coupled.

[0074] In this embodiment, a total of five internal dielectric resonators are arranged. The internal dielectric resonator 11 is coupled to the input port 10. The internal dielectric resonator 12 is coupled to the internal dielectric resonator 11. The internal dielectric resonator 13 is coupled to the internal dielectric resonator 12. The internal dielectric resonator 14 is coupled to the internal dielectric resonator 13. The internal dielectric resonator 15 is coupled to the internal dielectric resonator 14. The output port 20 is coupled to the internal dielectric resonator 15. The five internal dielectric resonators are staggered, and a polyline-type main coupling channel is formed therein. The path of the main coupling channel may be a curved line in FIG. 20. The arrows at the ends of the curved lines indicate the transmission paths of the high-frequency signals. The high-frequency signals are transmitted from the input port 10 to the output port 20 along the main coupling channel.

[0075] As shown in FIG. 20, two external dielectric resonators, an external dielectric resonator B21 and an external dielectric resonator B22, are arranged outside the output port 20. The external dielectric resonator B21 is coupled to the output port 20. The external dielectric resonator B22 is coupled to the external dielectric resonator B21. The external dielectric resonator B22 may be further coupled to the internal dielectric resonator 15. The arrangement design of the two external dielectric resonators depends on the design requirements of the dielectric filter. In this embodiment, the two external dielectric resonators are arranged based on the arrangement of the internal dielectric resonator, and the arrangement of the two external dielectric resonators is the same as the arrangement of the internal dielectric resonator 14 and the internal dielectric resonator 15. When a cascaded coupled resonator with a staggered topology structure is used, cross-coupling may be generated when the internal dielectric resonator forms a main coupling channel. The cross-coupling is useful for implementing the transmission zero point function of the dielectric filter, and the out-of-band rejection performance of the dielectric filter is improved by the transmission zero point generated by the two external dielectric resonators.

[0076] Example 5 In this example, reference is made to Fig. 22 and Fig. 23. Fig. 22 is a fifth schematic diagram of a dielectric filter according to an embodiment of the present application. Fig. 23 is a schematic diagram of the topology structure of the dielectric filter shown in Fig. 22. As shown in Fig. 22 and Fig. 23, a plurality of internal dielectric resonators are arranged between the input port 10 and the output port 20, and the plurality of internal dielectric resonators are arranged in a staggered manner.

[0077] In this embodiment, a total of three internal dielectric resonators are arranged. The internal dielectric resonator 11 is coupled to the input port 10. The internal dielectric resonator 12 is coupled to the internal dielectric resonator 11. The internal dielectric resonator 13 is coupled to the internal dielectric resonator 12. The output port 20 is coupled to the internal dielectric resonator 13. In this case, the three internal dielectric resonators are staggered to form a polyline-type main coupling channel. A high-frequency signal is transmitted from the input port 10 to the output port 20 along the main coupling channel.

[0078] As shown in FIG. 22, two external dielectric resonators, an external dielectric resonator A31 and an external dielectric resonator A32, are arranged outside the input port 10. The external dielectric resonator A31 is coupled to the output port 20. The external dielectric resonator A32 is coupled to the external dielectric resonator A31. The external dielectric resonator A32 may be further coupled to the internal dielectric resonator 11. Two external dielectric resonators, an external dielectric resonator B21 and an external dielectric resonator B22, are arranged outside the output port 20. The external dielectric resonator B21 is coupled to the output port 20. The external dielectric resonator B22 is coupled to the external dielectric resonator B21. The external dielectric resonator B22 may be further coupled to the internal dielectric resonator 13.

[0079] The layout design of the two external dielectric resonators at the outside of each port depends on the design requirements of the dielectric filter. In this embodiment, the external dielectric resonator A31 and the external dielectric resonator A32 are arranged based on the layout of the internal dielectric resonator 11 and the internal dielectric resonator 12. The external dielectric resonator B21 and the external dielectric resonator B22 are arranged based on the layout of the internal dielectric resonator 13 and the internal dielectric resonator 12. In this embodiment, the two external dielectric resonators are arranged at both the outer end of the input port 10 and the outer end of the output port 20, so that four transmission zero points can be generated, resulting in better out-of-band rejection performance.

[0080] When the cascaded coupled resonators of the main coupling channel are arranged nonlinearly, a coupling groove 30 is arranged between two adjacent internal dielectric resonators. As shown in FIG. 1, FIG. 7, FIG. 20, and FIG. 22, the amount of dielectric between two adjacent internal dielectric resonators may be controlled by arranging the coupling groove 30. The amount of dielectric is controlled by controlling the size of the coupling groove 30, whereby the amount of coupling between the two internal dielectric resonators can be controlled. By controlling the amount of coupling between the internal dielectric resonators, the formation of the main coupling channel is controlled. The cascaded coupled resonators of the main coupling channel may be in different forms. In practical applications, the arrangement of the cascaded coupled resonators of the main coupling channel may be flexibly adjusted, which makes it generally easier to arrange the dielectric filter.

[0081] The shape of the coupling groove 30 is related to the amount of coupling between the internal dielectric resonators in the cascaded coupled resonators of the staggered topology structure. The coupling groove 30 may be used to control the amount of coupling between the two internal dielectric resonators by controlling the amount of dielectric between the two internal dielectric resonators, so that the amount of dielectric between each internal dielectric resonator may be determined by setting the amount of coupling between the two internal dielectric resonators, and thus the corresponding shape of the coupling groove 30 may be determined.

[0082] In this embodiment of the present application, the external dielectric resonator includes a resonator body formed by a part of the dielectric and a debug hole disposed in the resonator body. The debug hole is a blind hole or a through hole. The resonator body in this embodiment is a part of the dielectric, and the debug hole is set as a blind hole or a through hole. The frequency of the external dielectric resonator may be adjusted by setting the depth of the debug hole. Specifically, whether the external dielectric resonator is a blind hole or a through hole is flexibly determined according to the design requirements of the dielectric filter. In this way, design freedom can be maintained.

[0083] In this embodiment of the present application, the external dielectric resonator A32 or the external dielectric resonator B22 is coupled to an internal dielectric resonator near a port. The internal dielectric resonator near a port is an internal 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 may be an input port 10 or an output port 20, which specifically depends on the position of the external dielectric resonator. For example, when the external dielectric resonator A32 is located only on the input port 10 side, the port is the input port 10. When the external dielectric resonator B22 is located only on the output port 20 side, the port is the output port 20. When the external dielectric resonator A32 and the external dielectric resonator B22 are located on both the input port 10 and the output port 20, the port includes the input port 10 and the output port 20.

[0084] The external dielectric resonator A32 or the external dielectric resonator B22 is coupled to the input port 10 or the output port 20. The input port 10 is coupled to the internal dielectric resonator adjacent to the input port 10 (the first internal dielectric resonator in the cascaded coupled resonators of the main coupling channel). The output port 20 is coupled to the internal dielectric resonator adjacent to the output port 20 (the last internal dielectric resonator in the cascaded coupled resonators of the main coupling channel). Therefore, the arrangement of the filter topology may be a staggered arrangement. Specifically, the two external dielectric resonators and the internal dielectric resonator near the port are arranged in a triangular shape. By arranging in this way, cross-coupling between the two external dielectric resonators and the internal dielectric resonator near the port is more likely to occur, resulting in a better out-of-band rejection effect.

[0085] Example 1 As shown in Fig. 20, two external dielectric resonators are arranged outside the output port 20. The external dielectric resonator B21 is coupled to the output port 20. The external dielectric resonator B22 is coupled to the external dielectric resonator B21. The output port 20 is coupled to the internal dielectric resonator 15. In this case, the internal dielectric resonator 15 is the internal dielectric resonator near the port. The external dielectric resonator B22 is coupled to the internal dielectric resonator 15. A cross-coupling may be generated between the external dielectric resonator B21, the external dielectric resonator B22 and the internal dielectric resonator 15, which can obtain a better out-of-band rejection effect.

[0086] Example 2 As shown in FIG. 22, two external dielectric resonators are arranged on both the outside of the input port 10 and the output port 20. The external dielectric resonator A31, which is on the outside of the input port 10, is coupled to the input port 10. The external dielectric resonator A32 is coupled to the external dielectric resonator A31. The input port 10 is coupled to the internal dielectric resonator 11, which is an internal dielectric resonator near the port of the input port 10. The external dielectric resonator B21, which is on the outside of the output port 20, is coupled to the output port 20. The external dielectric resonator B22 is coupled to the external dielectric resonator B21. The output port 20 is coupled to the internal dielectric resonator 13, which is an internal dielectric resonator near the port of the output port 20. Cross-coupling is generated between the external dielectric resonator A31, the external dielectric resonator A32, and the internal dielectric resonator 11. Cross-coupling is generated between the external dielectric resonator B21, the external dielectric resonator B22 and the internal dielectric resonator 13. Since cross-coupling is generated at both ports, a better out-of-band rejection effect can be obtained.

[0087] In this embodiment of the present application, a coupling hole 50 and / or a coupling groove 40 is arranged between the internal 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 groove 40 is arranged between the internal dielectric resonator adjacent to the output port 20 and the external dielectric resonator B21 adjacent to the output port 20.

[0088] When the coupling holes 50 or coupling grooves 40 are arranged, the arranged coupling holes 50 or coupling grooves 40 may be used to adjust the coupling amount between the input port 10 and the internal and external dielectric resonators A31 arranged on both sides of the input port 10, or the coupling amount between the output port 20 and the internal and external dielectric resonators B21 arranged on both sides of the output port 20. The coupling holes 50 and coupling grooves 40 are different forms of mechanisms for adjusting the coupling amount between the input port 10 or the output port 20 and the internal and external dielectric resonators. In practical applications, the corresponding coupling holes 50 or coupling grooves 40 may be designed according to the requirement of the coupling amount between the input port 10 or the output port 20 and the internal and external dielectric resonators. By using the coupling holes 50 and the coupling grooves 40 in combination, various designs and flexible adjustments to the coupling amount between the internal and external dielectric resonators may be implemented.

[0089] In this embodiment of the present application, the coupling holes 50 are blind holes or through holes, and the coupling grooves 40 are blind grooves. The coupling holes 50 are set as through holes or blind holes. The effect of adjusting the coupling amount between the input port 10 or the output port 20 and the dielectric resonators of the corresponding ports by using through holes is different from the effect brought about by using blind holes. Whether the coupling holes 50 are through holes or blind holes depends on the requirement of adjusting the coupling amount. In this way, the coupling amount between the input port 10 or the output port 20 and each dielectric resonator is more easily adjusted. This simple adjustment method makes the dielectric filter easier to manufacture and process.

[0090] Next, the arrangement and combination of the coupling holes 50 and the coupling grooves 40 will be described with reference to FIGS.

[0091] Example 1 The coupling groove 40 is disposed between the internal and external dielectric resonators adjacent to the input port 10, or the coupling groove 40 is disposed between the internal and external dielectric resonators adjacent to the output port 20. The coupling groove 40 is not in communication with either the internal dielectric resonator disposed at one end of the coupling groove 40 or the external dielectric resonator disposed at the other end of the coupling groove 40.

[0092] The internal dielectric resonator and the external dielectric resonator are both adjacent to the input port 10, or both adjacent to the output port 20. Since the coupling groove 40 is designed not to communicate with either the internal dielectric resonator or the external dielectric resonator, the coupling amount between the input port 10 and the internal dielectric resonator and the coupling amount between the input port 10 and the external dielectric resonator can be small, and / or the coupling amount between the output port 20 and the internal dielectric resonator and the coupling amount between the output port 20 and the external dielectric resonator can be small.

[0093] An example will be described in which the coupling groove 40 is disposed between the internal dielectric resonator and the external dielectric resonator adjacent to the input port 10. Please refer to FIG. 10 and FIG. 11. FIG. 10 is a first schematic diagram showing the coupling between the input port and the internal dielectric resonator and the external dielectric resonator in a dielectric filter according to an embodiment of the present application. FIG. 11 is a cross-sectional view of the first schematic diagram showing the coupling between the port of FIG. 10 and the internal dielectric resonator and the external dielectric resonator. As shown in FIG. 10 and FIG. 11, the internal dielectric resonator adjacent to the input port 10 is the internal dielectric resonator 11, the external dielectric resonator adjacent to the input port 10 is the external dielectric resonator A31, the coupling groove 40 is disposed between the internal dielectric resonator 11 and the external dielectric resonator A31, and the coupling groove 40 is not communicated with the internal dielectric resonator 11 and the external dielectric resonator A31. By adjusting the size of the coupling groove 40, for example by adjusting the depth, length or width of the coupling groove 40, the amount of coupling between the input port 10 and the internal dielectric resonator 11 and the amount of coupling between the input port 10 and the external dielectric resonator may be adjusted.

[0094] Example 2 The coupling groove 40 is disposed between the internal dielectric resonator adjacent to the input port 10 and the external dielectric resonator, or the coupling groove 40 is disposed between the internal dielectric resonator adjacent to the output port 20 and the external dielectric resonator, and one end of the coupling groove 40 is in communication with the internal dielectric resonator disposed at one end of the coupling groove 40, or in communication with the external dielectric resonator disposed at the other end of the coupling groove 40.

[0095] An example will be described in which the coupling groove 40 is disposed between the internal dielectric resonator and the external dielectric resonator adjacent to the input port 10. Please refer to FIG. 12 and FIG. 13. FIG. 12 is a second schematic diagram showing the coupling between the input port and the internal and external dielectric resonators in a dielectric filter according to an embodiment of the present application. FIG. 13 is a cross-sectional view of the second schematic diagram showing the coupling between the port of FIG. 12 and the internal and external dielectric resonators. As shown in FIG. 12 and FIG. 13, the internal dielectric resonator adjacent to the input port 10 is the internal dielectric resonator 11, the external dielectric resonator adjacent to the input port 10 is the external dielectric resonator A31, and the coupling groove 40 is disposed between the internal dielectric resonator 11 and the external dielectric resonator A31. The coupling groove 40 does not communicate with the internal dielectric resonator 11, while the coupling groove 40 communicates with the external dielectric resonator A31. Alternatively, the coupling groove 40 communicates with the internal dielectric resonator 11, while the coupling groove 40 does not communicate with the external dielectric resonator A31 (not shown in this case). In practical applications, the communication relationship between the coupling groove 40 and the internal dielectric resonator 11 and the external dielectric resonator A31 may be adjusted according to specific requirements to adjust the coupling amount between the input port 10 and the internal dielectric resonator 11 and the external dielectric resonator A31. In the example shown in FIG. 12, the coupling groove 40 does not communicate with the internal dielectric resonator 11, while the coupling groove 40 communicates with the external dielectric resonator A31. When the distance between the input port 10 and the internal dielectric resonator 11 is equal to the distance between the input port 10 and the external dielectric resonator A31, the coupling amount between the input port 10 and the external dielectric resonator A31 is greater than the coupling amount between the input port 10 and the internal dielectric resonator 11. Also, the coupling amount between the input port 10 and the internal dielectric resonator 11 may be adjusted by adjusting the distance between the coupling groove 40 and the internal dielectric resonator 11. Alternatively, the amount of coupling between the input port 10 and the internal dielectric resonator 11 and the amount of coupling between the input port 10 and the external dielectric resonator A31 may be adjusted by adjusting the depth and width of the coupling groove 40. Adjusting the amount of coupling between the port and the corresponding dielectric resonator by adjusting the size of the coupling groove 40 belongs to the prior art, so details will not be described here.

[0096] Both the internal dielectric resonator 11 and the external dielectric resonator A31 are adjacent to the input port 10, and one end of the coupling groove 40 is set to communicate with the dielectric resonator 11, so that the coupling amount between the input port 10 and the internal dielectric resonator 11 can be increased. Alternatively, one end of the coupling groove 40 is set to communicate with the external dielectric resonator A31, so that the coupling amount between the input port 10 and the external dielectric resonator A31 can be increased. In this manner, the coupling amount between the input port 10 on the dielectric resonator and the internal dielectric resonator 11 or the external dielectric resonator can be adjusted. In this embodiment, the input port 10 is used only as an illustrative example. The input port 10 may 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. The external dielectric resonator A31 corresponds to the external dielectric resonator adjacent to the output port 20.

[0097] Example 3 The coupling groove 40 is disposed between the internal dielectric resonator and the external dielectric resonator adjacent to the input port 10, or the coupling groove 40 is disposed between the internal dielectric resonator and the external dielectric resonator adjacent to the output port 20, and both ends of the coupling groove 40 are in communication with the internal dielectric resonator disposed at one end of the coupling groove 40 and the external dielectric resonator disposed at the other end of the coupling groove 40.

[0098] An example will be described in which the coupling groove 40 is disposed between the internal dielectric resonator and the external dielectric resonator adjacent to the input port 10. Please refer to FIG. 14 and FIG. 15. FIG. 14 is a third schematic diagram showing the coupling between the input port and the internal dielectric resonator and the external dielectric resonator in a dielectric filter according to an embodiment of the present application. FIG. 15 is a cross-sectional view of the third schematic diagram showing the coupling between the port of FIG. 14 and the internal dielectric resonator and the external dielectric resonator. As shown in FIG. 14 and FIG. 15, the internal dielectric resonator adjacent to the input port 10 is the internal dielectric resonator 11, the external dielectric resonator adjacent to the input port 10 is the external dielectric resonator A31, and the coupling groove 40 is disposed between the internal dielectric resonator 11 and the external dielectric resonator A31. The coupling groove 40 is in communication with both the internal dielectric resonator 11 and the external dielectric resonator A31. When the same arrangement of the input port 10, the internal dielectric resonator 11, and the external dielectric resonator A31 is applied and the coupling groove 40 is in communication with both the internal dielectric resonator 11 and the external dielectric resonator A31, the coupling amount between the input port 10 and the internal dielectric resonator 11 and the external dielectric resonator A31 is larger than the coupling amount when the coupling groove 40 is not in communication with either the internal dielectric resonator 11 or the external dielectric resonator A31. That is, the coupling amount between the input port 10 and the internal dielectric resonator 11 and the external dielectric resonator A31 in the case shown in FIG. 14 is larger than the coupling amount between the input port 10 and the internal dielectric resonator 11 and the external dielectric resonator A31 in the case shown in FIG. 12. In this embodiment, the coupling amount between the input port 10 and the internal dielectric resonator 11 and the coupling amount between the input port 10 and the external dielectric resonator A31 may be adjusted by adjusting the depth and width of the coupling groove 40.

[0099] Both ends of the coupling groove 40 are set to communicate with the internal dielectric resonator 11 and the external dielectric resonator A31. In this case, the amount of coupling between the input port 10 and the internal dielectric resonator 11 and the amount of coupling between the input port 10 and the external dielectric resonator A31 can be increased.

[0100] In addition, a coupling hole 50 may be further disposed between the internal 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 internal dielectric resonator, and the axis of the external dielectric resonator are parallel to each other.

[0101] Example 4 Please refer to FIG. 16. FIG. 16 is a fourth schematic diagram showing the coupling between the input port and the internal and external dielectric resonators in the dielectric filter according to an embodiment of the present application. As shown in FIG. 16, the internal dielectric resonator adjacent to the input port 10 is the internal dielectric resonator 11, the external dielectric resonator adjacent to the input port 10 is the external dielectric resonator A31, and a coupling hole 50 is disposed between the internal dielectric resonator 11 and the external dielectric resonator A31. In this embodiment, two coupling holes 50 are disposed. 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. Alternatively, the axes of the two coupling holes 50, the axes of the internal dielectric resonator 11, and the axes of the external dielectric resonator A31 may be disposed in the same plane. The two coupling holes 50 are disposed on both sides of the input port 10, respectively. The coupling holes 50 may be through holes or blind holes, or may be a combination of through holes and blind holes. The amount of coupling between the input port 10 and the internal dielectric resonator 11 may be adjusted by adjusting the position of the coupling hole 50 between the input port 10 and the internal dielectric resonator 11. Also, the amount of coupling between the input port 10 and the external dielectric resonator A31 may be adjusted by adjusting the position of the coupling hole 50 between the input port 10 and the external dielectric resonator A31.

[0102] Please refer to Fig. 17. For example, Fig. 17 is a fifth schematic diagram showing the coupling between the input port and the internal and external dielectric resonators in the dielectric filter according to an embodiment of the present application. As shown in Fig. 17, the axes of the two coupling holes 50 are parallel to the axis of the internal dielectric resonator 11 and the axis of the external dielectric resonator A31. However, the plane on which the axis of the internal dielectric resonator 11 and the axis of the external dielectric resonator A31 lie is perpendicular to the plane on which the axes of the two coupling holes 50 lie, and the two coupling holes 50 are disposed on both sides of the plane on which the axis of the internal dielectric resonator 11 and the axis of the external dielectric resonator A31 lie. In practical applications, the specific positions of the coupling holes 50 depend on the amount of coupling between the input port 10 and the internal dielectric resonator 11 and the amount of coupling between the input port 10 and the external dielectric resonator A31.

[0103] The positions of the two coupling holes 50 are set as shown in Fig. 17, that is, the two coupling holes 50 are arranged on both sides of the plane on which the axis of the internal dielectric resonator 11 and the axis of the external dielectric resonator A31 are located. Unlike the state of Fig. 16 in which the axes of the two coupling holes 50 are located in the plane on which the axis of the internal 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 occurring between the internal dielectric resonator 11 and the external dielectric resonator A31. In this way, the interference caused by the parasitic coupling in the implementation of the transmission zero point can be reduced.

[0104] In this case, the axis of the coupling hole 50 may be set parallel to the axis of the internal dielectric resonator and the axis of the external dielectric resonator, which may facilitate manufacturing and processing. In this embodiment, the coupling hole 50 may be a through hole or a blind hole, and may be configured to adjust the amount of coupling between the input port 10 and the internal dielectric resonator 11 and the amount of coupling between the input port 10 and the external dielectric resonator A31.

[0105] Example 5 In addition to the cases shown in the previous embodiments, both the coupling groove 40 and the coupling hole 50 may be disposed between the inner and outer dielectric resonators adjacent to the input port 10 or the output port 20.

[0106] An example in which both the coupling groove 40 and the coupling hole 50 are arranged between the internal dielectric resonator and the external dielectric resonator adjacent to the input port 10 will be described. Please refer to FIG. 18 and FIG. 19. FIG. 18 is a sixth schematic diagram showing the coupling between the input port and the internal dielectric resonator and the external dielectric resonator in the dielectric filter according to an embodiment of the present application. FIG. 19 is a cross-sectional view of the sixth schematic diagram showing the coupling between the port of FIG. 18 and the internal dielectric resonator and the external dielectric resonator. As shown in FIG. 18 and FIG. 19, the internal dielectric resonator adjacent to the input port 10 is the internal dielectric resonator 11, the external dielectric resonator adjacent to the input port 10 is the external dielectric resonator A31, and both the coupling groove 40 and the coupling hole 50 are arranged between the internal dielectric resonator 11 and the external dielectric resonator A31. In this embodiment, the coupling groove 40 is arranged on the side close to the external dielectric resonator A31, and the coupling hole 50 is arranged on the side close to the internal dielectric resonator 11. Note that the positions of the coupling groove 40 and the coupling hole 50 are not limited to this. The coupling amount between the input port 10 and the external dielectric resonator A31 and the coupling amount between the input port 10 and the internal dielectric resonator 11 may be adjusted. In this embodiment, the coupling groove 40 communicates with the external dielectric resonator A31. Alternatively, the coupling groove 40 may be set not to communicate with the external dielectric resonator A31 based on the coupling amount between the input port 10 and the external dielectric resonator A31. In order to facilitate manufacturing and processing, the axis of the coupling hole 50 may be set vertically, and one or more coupling holes 50 may be configured based on the coupling amount between the input port 10 and the internal dielectric resonator 11.

[0107] In this embodiment, the input port 10 is composed of a connector 101 and a through hole 100. The connector 101 is coupled to a dielectric, and the through hole 100 is a through hole penetrating the connector 101 and the dielectric. When the connector 101 has a uniform shape, the axis of the through hole 100 may pass through the center of the connector 101 when the through hole 100 is arranged. In a situation where the coupling groove 40 is arranged between the internal dielectric resonator and the external dielectric resonator adjacent to the input port 10, the through hole 100 may communicate with the coupling groove 40 when the through hole 100 is arranged.

[0108] In the above embodiment, only the case where the coupling groove 40 and / or the coupling hole 50 are arranged between the internal dielectric resonator 11 and the external dielectric resonator A31 at the input port 10 has been described. In practical application, the corresponding internal dielectric resonator and the corresponding external dielectric resonator may be arranged at either the input port 10 or the output port 20, and the coupling groove 40 and / or the coupling hole 50 are arranged between the internal dielectric resonator and the external dielectric resonator. The coupling groove 40 and / or the coupling hole 50 may be arranged in the form shown in the above embodiment. When the coupling groove 40 and / or the coupling hole 50 are arranged at the input port 10 and the coupling groove 40 and / or the coupling hole 50 are arranged at the output port 20, the arrangement forms of the above embodiment may be combined. For example, only the coupling groove 40 is arranged at the input port 10, and the position of the coupling groove 40 is the position shown in embodiment 1, and only the coupling groove 40 is arranged at the output port 20, and the position of the coupling groove 40 is the position shown in embodiment 2. In another example, only the coupling hole 50 is located at the input port 10, with the coupling hole 50 being located at the position shown in Example 4, and both the coupling groove 40 and the coupling hole 50 are located at the output port 20, with the coupling groove 40 and the coupling hole 50 being located at the position shown in Example 5. Not all combinations are described herein with examples.

[0109] In this embodiment of the present application, both the outer and inner surfaces of the dielectric are metallized. The inner surfaces of the dielectric include all inner surfaces of the through holes, the inner and bottom surfaces of the blind holes, and the inner and bottom surfaces of the blind grooves provided in the dielectric. By metallizing both the outer and inner surfaces of the dielectric, metal walls are formed on the outer and inner surfaces of the dielectric. By completely encasing the dielectric using the metal walls, a resonant system is formed in the dielectric.

[0110] Based on the same inventive concept, an embodiment of the present application provides a transceiver, which includes a receiver, a transmitter, an amplifying unit, and the dielectric filter provided in any one of the above-mentioned embodiments. The technical effect of the transceiver is the same as that of the dielectric filter provided in the above-mentioned embodiments, so the details are not repeated here.

[0111] Based on the same inventive concept, an embodiment of the present application provides a base station, which comprises an antenna feeder component, a control component, and the transceiver provided in the above embodiment. The technical effect of the base station is the same as that of the transceiver provided in the above embodiment, so the details are not repeated here.

[0112] The above description is merely a specific embodiment of the present application, and is not intended to limit the scope of protection of the present application. Any variations or replacements that can be easily thought of by those skilled in the art in the technical scope disclosed in this application shall fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

[0113] All embodiments herein are described step by step, with each embodiment focusing on the differences from the other embodiments, and cross references may be made to the same or similar parts of the embodiments.

[0114] Although the preferred embodiments in the embodiments of the present application have been described, those skilled in the art can make changes and modifications to these embodiments once they have grasped the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and any changes and modifications that fall within the scope of the embodiments of the present application.

[0115] Above, the dielectric filter, transceiver, and base station provided in the present application have been described in detail. In this specification, the principle and implementation of the present application are described using specific examples. The description of the above embodiments is only used to help understand the method and core concept of the present application. In addition, a person skilled in the art can make changes to the specific implementation and application scope according to the concept of the present application. Therefore, the contents of this specification should not be interpreted as limiting the present application. [Explanation of symbols]

[0116] 10 Input Ports 11, 12, 13, 14, 15 Internal dielectric resonator 20 Output Ports 21, 22 External dielectric resonator B 31, 32 External dielectric resonator A 30, 40 joint groove 50 binding holes 100 through hole 101 Connector

Claims

1. A dielectric filter comprising a dielectric, and an input port, an output port, an internal dielectric resonator, and an external dielectric resonator disposed on the dielectric, wherein a plurality of internal dielectric resonators are disposed between the input port and the output port to form a cascaded coupled resonator of a main coupling channel, and two external dielectric resonators are disposed on one side of the input port, and a coupling amount between the external dielectric resonator and the input port is greater than a coupling amount between the external dielectric resonator and any of the internal dielectric resonators, and / or two external dielectric resonators are disposed on one side of the output port, and a coupling amount between the external dielectric resonator and the output port is greater than a coupling amount between the external dielectric resonator and any of the internal dielectric resonators. a first external dielectric resonator coupled to the input port or the output port, the second external dielectric resonator coupled to an internal dielectric resonator adjacent to the port, the internal dielectric resonator adjacent to the port being an internal dielectric resonator adjacent to the port on the side where the second external dielectric resonator is located.

2. the included angle between the first line and the second line is 90° or more, and / or the included angle between the third line and the fourth line is 90° or more; the first line is a line between a center of the external dielectric resonator and a center of the input port, and the second line is a line between a center of the internal dielectric resonator closest to the input port and the center of the input port, 2. The dielectric filter according to claim 1, wherein the third line is a line between a center of the external dielectric resonator and a center of the output port, and the fourth line is a line between a center of the internal dielectric resonator closest to the output port and the center of the output port.

3. 3. The dielectric filter according to claim 1, wherein the cascaded resonators of the main coupling channel include cascaded resonators of a linear topology structure or cascaded resonators of a staggered topology structure.

4. 4. The dielectric filter of claim 3, wherein the external dielectric resonator includes a resonator body defined by a portion of the dielectric and a debug hole disposed in the resonator body, the debug hole being a blind hole or a through hole.

5. 5. A dielectric filter according to claim 1, wherein a coupling hole and / or a coupling groove is arranged between the external dielectric resonator and an internal dielectric resonator in the vicinity of the port, and the internal dielectric resonator in the vicinity of the port is an internal dielectric resonator adjacent to the port on the side on which the external dielectric resonator is arranged.

6. 6. The dielectric filter according to claim 5, wherein the coupling holes are blind holes or through holes.

7. 6. The dielectric filter according to claim 5, wherein said coupling groove is a blind groove.

8. 8. A dielectric filter according to claim 5, wherein the coupling groove is disposed between the internal dielectric resonator and the external dielectric resonator adjacent to the input port or the output port, and the coupling groove is not in communication with either the internal dielectric resonator disposed at one end of the coupling groove or the external dielectric resonator disposed at the other end of the coupling groove.

9. 8. A dielectric filter according to claim 5, wherein the coupling groove is arranged between the internal dielectric resonator and the external dielectric resonator adjacent to the input port or the output port, and one end of the coupling groove is connected to the internal dielectric resonator arranged at one end of the coupling groove or the external dielectric resonator arranged at the other end of the coupling groove.

10. 8. A dielectric filter according to claim 5, wherein a coupling groove is arranged between the internal dielectric resonator and the external dielectric resonator adjacent to the input port or the output port, and the two ends of the coupling groove are respectively connected to the internal dielectric resonator arranged at one end of the coupling groove or the external dielectric resonator arranged at the other end of the coupling groove.

11. 11. The dielectric filter according to claim 5, wherein the coupling hole is disposed between the internal 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 internal dielectric resonator, and an axis of the external dielectric resonator are parallel to each other.

12. 12. A dielectric filter according to claim 1, wherein both the outer and inner surfaces of the dielectric are metallized.

13. A transceiver comprising a receiver, a transmitter, an amplification unit, and a dielectric filter according to any one of claims 1 to 12.

14. A base station comprising an antenna feed component, a control component, and a transceiver according to claim 13.

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