Dielectric filter coupling structure, dielectric filter and communication equipment

Abstract

The invention relates to the technical field of communication, and discloses a dielectric filter coupling structure, a dielectric filter and communication equipment. The dielectric filter coupling structure comprises a first dielectric body, a second dielectric body and a coupling structure. Wherein the first dielectric body extends along a first direction, and the first dielectric body comprises a first resonance blind hole to form a first resonator; the second dielectric body extends in the second direction and is located on one side of the first dielectric body, and the second dielectric body comprises a second resonance blind hole to form a second resonator; the first direction is not parallel to the second direction; the coupling structure is located between the first resonator and the second resonator, so that the first resonator and the second resonator are capacitively or inductively coupled. According to the dielectric filter coupling structure, the first resonator and the second resonator are adopted as the minimum resonance units and are used for providing a basis for reducing the size of the dielectric filter comprising the multiple resonators, the geometric size of the dielectric filter can be effectively reduced, and the miniaturization requirement of dielectric filter application is met.

Description

Technical Field

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

[0002] Dielectric filters are widely used in communications (such as 5G wireless communications), radar, navigation systems and other fields. Dielectric filters include multiple resonators, coupling structures and excitation structures. At present, for dielectric filters including multiple resonators, the structural design of dielectric filters is usually carried out in the form of coplanar sequential connection or face-to-face stacking connection.

[0003] When the design is carried out in the form of coplanar sequential connection, along the thickness direction of the resonator, each resonator includes an upper surface and a lower surface, the upper surfaces of multiple resonators are in the same plane, and the lower surfaces of multiple resonators are also in the same plane. At this time, the multiple resonators are arranged in a similar straight line as a whole to form a coplanar resonator coupling structure. It can also be understood that, in the dielectric filter using coplanar sequential connection, the extension direction of each resonator in the dielectric filter is parallel. Therefore, the single-layer coplanar dielectric filter including this coplanar resonator coupling structure has a large geometric size, which is not conducive to achieving a compact structure of the dielectric filter.

[0004] For the opposite stacking connection, it can be understood that, along the thickness direction of the dielectric filter, at least two of the multiple resonators are connected face to face to stack as an opposite resonator coupling structure. It can also be understood that, in the dielectric filter with opposite stacking connection, the extension direction of each resonator in the dielectric filter is parallel. Under this design form, for example, when the number of resonators is an odd number (for example, three), the dielectric filter coupled thereto is arranged in an L-shaped shape as a whole. At this time, this type of dielectric filter also has the problem of non-compact structure and large volume. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the embodiments of the present application provide a dielectric filter coupling structure, a dielectric filter and a communication device. The dielectric filter coupling structure of the embodiments of the present application can provide a basis for reducing the geometric dimensions of a dielectric filter composed of three or more dielectric resonators, effectively reduce the geometric dimensions of a dielectric filter including multiple dielectric resonators, and meet the miniaturization requirements of dielectric filter applications.

[0006] The present application is introduced below from multiple aspects, and the implementation methods and beneficial effects of the following multiple aspects can be referenced to each other.

[0007] The first aspect of the present application provides a dielectric filter coupling structure. Specifically, the dielectric filter coupling structure includes: a first dielectric body extending along a first direction, the first dielectric body including a first resonant blind hole to form a first resonator; a second dielectric body extending along a second direction and located on one side of the first dielectric body along the first direction, the second dielectric body including a second resonant blind hole to form a second resonator, the first direction and the second direction are not parallel; the first dielectric body and the second dielectric body form a containing space; a first coupling structure, the first coupling structure is arranged between the first resonator and the second resonator, so that the first resonator and the second resonator are capacitively coupled or inductively coupled.

[0008] The dielectric filter coupling structure adopts a first resonator and a second resonator as the minimum resonance unit; the second dielectric body of the second resonator is arranged on one side of the first dielectric body of the first resonator along the first direction and extends along the second direction, and the coupling structure is arranged between the first resonator and the second resonator, so that the first resonator and the second resonator are capacitively coupled or inductively coupled. Since the extension direction (first direction) of the first dielectric body and the extension direction (second direction) of the second dielectric body are not parallel, the first dielectric body and the second dielectric body are not connected in sequence in the same plane or stacked in opposite directions, but form a containing space, and the dielectric body can be contained in the containing space to form a resonator, which can ensure the compact structure of the dielectric filter.

[0009] It can also be understood that the first dielectric body and the second dielectric body are not connected in sequence in the same plane or stacked in opposite directions, and the connected first dielectric body and the second dielectric body are overall similar to an L-shape. Such a dielectric filter coupling structure arrangement method provides a basis for reducing the geometric size of the dielectric filter including multiple dielectric resonators. For example, the third dielectric body (used to form a resonator) is arranged in the accommodation space surrounded by the first dielectric body and the second dielectric body, that is, the third dielectric body is arranged below the first dielectric body and on one side of the second dielectric body. The structure of the entire dielectric filter is compact (similar to a rectangular parallelepiped structure), which can effectively reduce the geometric size of the dielectric filter including multiple dielectric resonators, thereby meeting the miniaturization requirements of dielectric filter applications.

[0010] In a possible implementation of the first aspect, the dielectric filter coupling structure further includes a third dielectric body, a second coupling structure and a third coupling structure, wherein: the third dielectric body is located in the accommodating space, the third dielectric body extends along the first direction, and the third dielectric body includes a third resonant blind hole to form a third resonator; along the thickness direction of the first dielectric body, the third dielectric body and the first dielectric body are spaced apart, and along the first direction, the second dielectric body is located on the same side of the first dielectric body and the third dielectric body; the second coupling structure is arranged between the first resonator and the third resonator, so that the first resonator and the third resonator are inductively coupled; the third coupling structure is arranged between the second resonator and the third resonator, so that the second resonator and the third resonator are capacitively coupled or inductively coupled.

[0011] In an implementable solution, the second dielectric body is vertically arranged on the same side of the first dielectric body and the third dielectric body. At this time, the second direction is parallel to the thickness direction of the first dielectric body, and the first direction is parallel to the thickness direction of the second dielectric body.

[0012] The dielectric filter coupling structure further includes a third resonator, and the third dielectric body of the third resonator and the first dielectric body are located on the same side of the second dielectric body, that is, the second dielectric body is arranged on the same side of the first dielectric body and the third dielectric body. In other words, the first resonator and the second resonator as the minimum resonance unit form a receiving space, and the third resonator is arranged in the receiving space, which can effectively form a compact three-cavity resonator structure, effectively reduce the geometric size of the dielectric filter including the first resonator, the second resonator, and the third resonator, and meet the miniaturization requirements of dielectric filter applications (such as odd-order filters).

[0013] In addition, the dielectric filter using the dielectric filter coupling structure can achieve a transmission zero point, thereby effectively improving the out-of-band suppression capability and selection performance. For example, taking the first resonator connected to the output load and the third resonator connected to the excitation as an example, the signal is input from the input signal source, and the signal transmission path includes two: the signal is directly transmitted from the third resonator to the first resonator and output from the output load; or, the signal is transmitted from the third resonator to the second resonator, and then from the second resonator to the first resonator, and finally output from the output load. Therefore, the dielectric filter using the dielectric filter coupling structure has two signal transmission paths, which can achieve a transmission zero point.

[0014] In a possible implementation of the first aspect above, the second coupling structure includes a second coupling window, and the second coupling window is located between the first resonator and the third resonator.

[0015] In a possible implementation of the first aspect above, the third coupling structure includes a third coupling blind hole, and the third coupling blind hole is located between the second resonator and the third resonator.

[0016] In a possible implementation of the first aspect above, the third coupling structure includes a third coupling window, and the third coupling window is located between the second resonator and the third resonator.

[0017] Exemplarily, the outer surfaces of the first dielectric body, the second dielectric body, and the third dielectric body are covered with a conductive layer, and the conductive layer covers the first resonant blind hole, the second resonant blind hole, the third resonant blind hole, and the first coupling blind hole. Exemplarily, the conductive layer is made of a metal material, such as silver.

[0018] Exemplarily, the first dielectric body, the second dielectric body, and the third dielectric body are made of solid dielectric material, which may be any feasible material known in the art, such as ceramic.

[0019] In a possible implementation of the first aspect above, the first direction and the second direction are arranged at 90°.

[0020] That is, the first dielectric body and the second dielectric body are connected to form an L-shaped structure. It can be understood that when the dielectric filter coupling structure includes the above-mentioned minimum resonant unit (first resonator, second resonator), the second resonator is vertically connected to one side of the first resonator; when the dielectric filter coupling structure also includes a third resonator, the second resonator is vertically connected to the same side of the first resonator and the third resonator. In this vertically connected state, the structure of the dielectric filter including the dielectric filter coupling structure is relatively compact and occupies a small space.

[0021] In a possible implementation of the first aspect, along the thickness direction of the first dielectric body, the first dielectric body includes a first surface and a second surface disposed opposite to each other, and the first surface is provided with a first resonant blind hole; along the thickness direction of the second dielectric body, the second dielectric body includes a third surface and a fourth surface disposed opposite to each other, and the third surface is provided with a second resonant blind hole; the third surface is connected to the first surface, and the fourth surface is connected to the second surface; the first coupling structure includes a first coupling blind hole, and the first coupling blind hole is provided on the first surface and located between the first resonator and the second resonator.

[0022] In a possible implementation of the first aspect above, the first coupling blind hole is provided on the first surface or the third surface.

[0023] In a possible implementation of the first aspect, the second dielectric body further includes a first side surface, the third surface is connected to the first surface via the first side surface, and the first side surface and the first surface are in the same plane.

[0024] In a possible implementation of the first aspect, along a thickness direction of the first dielectric body, the first dielectric body includes a first surface and a second surface and a second side surface that are arranged opposite to each other, and the first surface is provided with the first resonant blind hole;

[0025] Along the thickness direction of the second dielectric body, the second dielectric body includes a third surface and a fourth surface and a first side surface which are arranged opposite to each other, the fourth surface and the second side surface are arranged at intervals along the first direction, the first side surface and the first surface are in the same plane, and the third surface is provided with a second resonant blind hole; the first coupling structure includes a first coupling window, the first coupling window is located between the fourth surface and the second side surface, and along the thickness direction of the first dielectric body, the top surface of the coupling window is in the same plane as the first side surface and the first surface.

[0026] In a possible implementation of the first aspect above, the first dielectric body, the second dielectric body and the third dielectric body are integrally formed.

[0027] In a possible implementation of the first aspect above, the first dielectric body, the second dielectric body, and the third dielectric body are respectively rectangular parallelepiped structures.

[0028] A second aspect of the present application provides a dielectric filter, which includes an input signal source, an output load, and a dielectric filter coupling structure as described in any one of the first aspects above.

[0029] A third aspect of the present application provides a communication device, which includes the dielectric filter of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of an application scenario of a dielectric filter provided in an embodiment of the present application is shown;

[0031] Figure 2A A schematic diagram of the structure of a first dielectric filter in some embodiments of the present application is shown;

[0032] Figure 2B A schematic diagram of the structure of a second dielectric filter in some embodiments of the present application is shown;

[0033] Figure 2C A schematic diagram showing the structure of a third dielectric filter in some embodiments of the present application is shown;

[0034] Figure 2D A schematic structural diagram of a fourth dielectric filter in some embodiments of the present application is shown;

[0035] Figure 2E A schematic structural diagram of a fifth dielectric filter in some embodiments of the present application is shown;

[0036] Figure 3 The structure diagram of the dielectric filter coupling structure provided in the embodiment of the present application is shown in FIG. Figure 1 ;

[0037] Figure 4A second structural diagram of a dielectric filter coupling structure provided in an embodiment of the present application is shown;

[0038] Figure 5 The structure of the dielectric filter provided in the embodiment of the present application is shown in FIG. Figure 1 ;

[0039] Figure 6 Shows Figure 5 Schematic diagram of the topological model of the dielectric filter shown;

[0040] Figure 7 Shows Figure 5 Schematic diagram of simulation results of the dielectric filter shown;

[0041] Figure 8 A second structural schematic diagram of a dielectric filter provided in an embodiment of the present application is shown;

[0042] Fig. 9 Shows Figure 8 Schematic diagram of the topological model of the dielectric filter shown;

[0043] Fig.10 Shows Figure 8 Schematic diagram of simulation results of the dielectric filter shown. DETAILED DESCRIPTION

[0044] The present application provides a dielectric filter coupling structure, a dielectric filter and a communication device, wherein the dielectric filter coupling structure can effectively reduce the geometric size and occupied space of the dielectric filter.

[0045] To facilitate understanding of the technical solution of the present application, some concepts or terms involved in the present application are first explained.

[0046] (1) Resonator

[0047] A frequency selective device that passes signals within its operating frequency band and attenuates signals outside of it.

[0048] (2) Passband

[0049] The passband is the frequency range that the filter can pass.

[0050] (3) Transmission Zero (TZ)

[0051] The transmission zero point is the notch point of the transmission coefficient S21 of the S parameter, which refers to the zero point that appears in the transmission function of the filter. The transmission zero point can change the frequency response of the filter and make it have better filtering characteristics.

[0052] (4) Power amplifier

[0053] The power amplifier is the main amplifier in the transmitter RF front end, used to convert low-power signals from communications and radar equipment into high-power transmission signals sent to the antenna.

[0054] (5) Radio Frequency Front-End (RFFE)

[0055] The RF front end is an important component of the wireless communication module. It is located between the antenna and the communication transceiver and mainly plays the role of receiving and transmitting signals.

[0056] With the development of science and technology, the number of radio frequency bands supported by various mobile terminals has increased dramatically, and the spectrum congestion has led to an increase in interference frequencies. Therefore, filters are needed to reduce interference frequencies. There are usually three options for selecting filters: metal cavity filters, plastic filters, and dielectric filters.

[0057] With the development and commercialization of 5G, the demand for lightweight filters has increased significantly. At present, the miniaturization and integrated design of filters are crucial. Since the dielectric filter itself does not have a metal cavity, it has the advantages of small size and good stability compared to the other two filters.

[0058] See also Figure 1 , Figure 1 A wireless communication base station 1000 is shown. The wireless communication base station 1000 includes a dielectric filter 11, a power amplifier 12 and an antenna 13.

[0059] The dielectric filter 11 can eliminate interference and clutter in the receiving and transmitting channels, allowing the signals within the working frequency band to pass without attenuation as much as possible, and attenuating the signals outside the working frequency band as much as possible, thereby achieving accurate frequency selection. The power amplifier 12 is mainly used to amplify the received signal.

[0060] like Figure 1 As shown, the dielectric filter 11 is located between the power amplifier 12 and the antenna 13. The power amplifier 12 first amplifies the received signal, then filters the amplified signal through the dielectric filter 11, and then transmits it to the antenna 13, and finally transmits the amplified and filtered signal through the antenna 13.

[0061] Dielectric filters usually include multiple resonators, coupling structures, and excitation structures.

[0062] In some embodiments, see Figure 2A , Figure 2A FIG. 1 shows a schematic diagram of the structure of the first dielectric filter 100 in some embodiments of the present application. Figure 2AAs shown, the first dielectric filter 100 includes a dielectric body 110, a conductive layer 120, a resonant blind hole 130, a coupling structure 140 and an excitation structure 150. The dielectric body 110 is covered with a conductive layer 120. Exemplarily, the dielectric body 110 is a rectangular dielectric block structure. The excitation structure 150 is used for signal input and output.

[0063] In this embodiment, the dielectric body 110 includes eight resonant blind holes 130. For example, four resonant blind holes 130 are respectively provided at four corners of the dielectric body 110, and along the length direction of the dielectric body 110 (eg Figure 2A In the A direction shown in FIG. 1 , two more resonant blind holes 130 are provided between the resonant blind holes 130 located at two corners. Exemplarily, each of the eight resonant blind holes 130 is arranged at equal intervals. The dielectric and conductor boundaries (such as the coupling structure 140 and the isolation wall 160) around each resonant blind hole 130 can form a resonator, so that Figure 2A The first dielectric filter 100 shown includes eight resonators.

[0064] Exemplarily, the coupling structure 140 of the first dielectric filter 100 includes a coupling blind hole 141 and a coupling window 142. For example, along the width direction of the dielectric body 110 (eg Figure 2A In the B direction shown in FIG, a coupling blind hole 141 is provided between the resonant blind holes 130 located at two corners to achieve capacitive coupling between two resonators adjacent in the width direction. At the same time, a coupling window 142 is provided between two adjacent resonant blind holes 130 along the length direction of the dielectric body 110 to achieve inductive coupling between two resonators adjacent in the length direction.

[0065] In addition, a partition wall 160 is provided on the dielectric body 110. The partition wall 160 is a through groove provided on the dielectric body 110. Figure 2A As shown, the isolation wall 160 may be in the form of a strip groove provided at the edge of the dielectric body 110 , or in the form of a T-shaped groove or a cross groove provided in the middle of the dielectric body 110 . The shape of the isolation wall 160 may be designed according to actual applications.

[0066] Understandably, Figure 2A The first dielectric filter 100 shown includes eight resonators (but not limited to eight, and may also include three, four, five or other multiple resonators). This type of dielectric filter is prone to being large in size and having poor flexibility in size design.

[0067] In other embodiments, for a dielectric filter including a plurality of resonators, a single-layer coplanar form (such as Figure 2B and Figure 2CAs shown in FIG. 1 , the structure is designed to form a coplanar resonator coupling structure. Since the single-layer coplanar form is realized by connecting multiple resonators in sequence, the geometric size of the dielectric filter formed by it is relatively large.

[0068] See also Figure 2B , Figure 2B FIG. 2 shows a schematic structural diagram of a second dielectric filter 200 having a coplanar resonator coupling structure. Figure 2B As shown, the second dielectric filter 200 includes two resonators 210, a coupling structure (such as a coupling window 212) and an excitation structure (not shown in the figure). Figure 2B The upper and lower surfaces of the two resonators 210 are respectively in the same plane, that is, the extension directions of the two resonators 210 are parallel, so that the second dielectric filter 200 is arranged in a similar straight line as a whole to form a coplanar resonator coupling structure. Each resonator 210 includes a resonant blind hole 211, and a coupling window 212 is provided between the two resonators 210 to achieve inductive coupling between the two resonators 210.

[0069] As you can see, Figure 2B The overall length of the second dielectric filter 200 shown depends on the length and number of the connected resonators 210. Figure 2B In the illustrated embodiment, two resonators 210 are the minimum resonant units, and if at least one more resonator is to be added, the overall size of the dielectric filter is likely to be too large in this single-layer coplanar design. In other words, such a minimum resonant unit (i.e., two resonators 210) in the coplanar resonator coupling structure cannot provide space for further adding resonators and a basis for reducing the size.

[0070] For example, see Figure 2C , Figure 2C A schematic structural diagram of a third dielectric filter 300 having a coplanar resonator coupling structure is shown. Figure 2C The third dielectric filter 300 is formed by adding a resonator 210 to the second dielectric filter 200. Figure 2C The third resonator 210 is connected in sequence to the right resonator 210 shown. A coupling window 212 is provided between two adjacent resonators 210 to achieve inductive coupling between the two. This single-layer coplanar design has obvious shortcomings, which can easily make the size of the dielectric filter (such as the third dielectric filter 300) with a coplanar resonator coupling structure formed by it too large, and cannot meet the miniaturization requirements of dielectric filter applications.

[0071] In some other embodiments, for a dielectric filter including a plurality of resonators, a stacked structure (eg, Figure 2D and Figure 2E The structure is designed as shown in the figure to form a face-to-face resonator coupling structure. Similarly, a dielectric filter designed in the form of face-to-face stacking will also cause the problem of larger size.

[0072] For example, see Figure 2D , Figure 2D FIG. 4 shows a schematic structural diagram of a fourth dielectric filter 400 having a face-to-face resonator coupling structure. Figure 2D As shown, the dielectric filter 400 includes two resonators 410, a coupling structure (eg, a coupling window 412), and an excitation structure (not shown in the figure).

[0073] Along the thickness direction of the fourth dielectric filter 400 (eg Figure 2D The two resonators 410 are connected face to face, and the height of the fourth dielectric filter 400 depends on the thickness of the connected resonators 410 and the number of the resonators 410. Each resonator 410 is provided with a resonant blind hole 411, and the two resonant blind holes 411 are opposite to each other along the thickness direction of the fourth dielectric filter 400; a coupling window 412 is provided between the two resonators 410 so that the two resonators 410 can achieve inductive coupling.

[0074] Similarly, in this embodiment, the two resonators 410 stacked up and down are the smallest resonator unit. If at least one more resonator is to be added, the size of the dielectric filter formed will be larger and the structure will not be compact. The smallest resonator unit (i.e., two resonators 410) in the opposite resonator coupling structure also cannot provide space for further adding resonators, reduce size, and provide a basis for compact layout.

[0075] For example, see Figure 2E , Figure 2E A fifth dielectric filter 500 having a face-to-face resonator coupling structure is shown. Figure 2E The fifth dielectric filter 500 is formed by adding a resonator 410 to the fourth dielectric filter 400. For example, a resonator 410 is provided on one side of the resonator 510 at the bottom. Figure 2E A resonator 410 is added to the left side of the dielectric filter 500 (shown in FIG. 1 ). A coupling window 422 is provided between the two resonators 510 at the bottom, so that inductive coupling can be achieved between the resonator 510 at the bottom and the resonator 520. At this time, the fifth dielectric filter 500 is generally L-shaped, has a non-compact structure, and occupies a significantly larger space and volume, which cannot meet the miniaturization requirements of the dielectric filter.

[0076] In summary, the existing dielectric filter coupling structure includes two minimum resonator units. When at least one resonator is added, the resulting dielectric filter is prone to problems such as a non-compact structure, large space occupation and large volume.

[0077] To solve the above technical problems, an embodiment of the present application provides a dielectric filter coupling structure, which includes two resonators that are not arranged in parallel, and the two resonators are neither in the same plane nor stacked up and down; the two resonators enclose a accommodating space, and a third resonator can be placed in the accommodating space, thereby forming a compact three-cavity resonator structure, which meets the miniaturization requirements of dielectric filter applications (such as odd-order dielectric filters).

[0078] The specific structure of the dielectric filter coupling structure according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0079] See also Figure 3 and Figure 4 , Figure 3 The three-dimensional structure of the dielectric filter coupling structure of the embodiment of the present application is shown. Figure 1 The dielectric filter coupling structure includes a first resonator 10 and a second resonator 20, and the first resonator 10 and the second resonator 20 are capacitively coupled; Figure 4 A second stereogram of the dielectric filter coupling structure of an embodiment of the present application is shown, wherein the dielectric filter coupling structure also includes a first resonator 10 and a second resonator 20, and the first resonator 10 and the second resonator 20 are inductively coupled.

[0080] like Figure 3 and Figure 4 As shown, the dielectric filter coupling structure of the embodiment of the present application adopts the first resonator 10 and the second resonator 20 as the minimum resonance unit, which can provide a basis for reducing the geometric size of the dielectric filter including multiple (for example, three) dielectric resonators. For example, the third resonator described later is arranged below the first resonator 10 and on one side of the second resonator 20. The structure of the entire dielectric filter is compact (similar to a rectangular parallelepiped structure), which can effectively reduce the geometric size of the dielectric filter including multiple dielectric resonators.

[0081] In the embodiment of the present application, the first resonator 10 includes a first dielectric body 101. The first dielectric body 101 is arranged along a first direction (eg Figure 3 and Figure 4 The first dielectric body 101 includes a first resonant blind hole 1011 to form a first resonator 10. The first resonant blind hole 1011 extends along the second direction (as shown in the Y direction) on the first dielectric body 101. Figure 3 and Figure 4The first resonant blind hole 1011 extends downward in the Z direction (Z direction shown in FIG), but does not penetrate the first dielectric body 101. The first resonant blind hole 1011 is used to change the resonant frequency of the first resonator 10, and the inner wall of the first resonant blind hole 1011 is a dielectric. That is, the first resonator 10 includes the first resonant blind hole 1011 and the surrounding dielectric.

[0082] In the embodiment of the present application, the second resonator 20 includes a second dielectric body 201. The second dielectric body 201 is arranged along a second direction (eg Figure 3 and Figure 4 The first dielectric body 101 extends along the first direction (Z direction shown in FIG. 1 ) and is located on one side ( Figure 3 and Figure 4 2 shows that the second dielectric body 201 is located on the left side of the first dielectric body 101 along the first direction). The second dielectric body 201 includes a second resonant blind hole 2011 to form a second resonator 20. In the embodiment of the present application, the first dielectric body 101 and the second dielectric body 201 are integrally formed.

[0083] The second resonant blind hole 2011 extends rightward along the first direction on the second dielectric body 201, but does not penetrate the second dielectric body 201. The second resonant blind hole 2011 is used to change the resonant frequency of the second resonator 20, and the inner wall of the second resonant blind hole 2011 is a dielectric. That is, the second resonator 20 includes the second resonant blind hole 2011 and the surrounding dielectric.

[0084] In some possible implementations, the first dielectric body 101 and the second dielectric body 201 may be processed by a split-body splicing molding process.

[0085] Continue reading Figure 3 and Figure 4 The dielectric filter coupling structure of the embodiment of the present application further includes a first coupling structure 30, and the first coupling structure 30 is located between the first resonator 10 and the second resonator 20. Exemplarily, the first coupling structure 30 includes a first coupling blind hole 301 (such as Figure 3 ) or the first coupling window 302 (as shown Figure 4 shown). Figure 3 The first coupling blind hole 301 shown can realize the capacitive coupling between the first resonator 10 and the second resonator 20. Figure 4 The first coupling window 302 shown can achieve inductive coupling between the first resonator 10 and the second resonator 20 .

[0086] However, the embodiment of the present application does not limit the specific setting form of the first coupling structure 30. For example, the first coupling structure 30 can also be a coupling structure such as a coupling through hole or a coupling groove. As long as the inductive coupling or capacitive coupling between the first resonator 10 and the second resonator 20 can be achieved, it belongs to the protection scope of the embodiment of the present application.

[0087] For example, see Figure 3 The first coupling blind hole 301 is opened in the first dielectric body 101, and the depth of the first coupling blind hole 301 is greater than the depth of the first resonant blind hole 1011. The embodiment of the present application does not limit the depth of the first coupling blind hole 301. As long as its depth is greater than the depth of the first resonant blind hole 1011, it belongs to the protection scope of the embodiment of the present application.

[0088] In addition, the first coupling blind hole 301 may also be disposed on the second dielectric body 201 (not shown in the figure), as long as it can be located between the first resonator 10 and the second resonator 20, it is within the protection scope of the embodiments of the present application.

[0089] The first resonator 10 and the second resonator 20 can achieve capacitive coupling through the first coupling blind hole 301. Exemplarily, the first coupling blind hole 301 includes at least one, that is, the first coupling blind hole 301 can also be set to two or three, and the embodiment of the present application does not limit the number of the first coupling blind holes 301, as long as the first resonator 10 and the second resonator 20 can achieve capacitive coupling, they all belong to the protection scope of the embodiment of the present application.

[0090] See also Figure 4 , Figure 4 It is exemplarily shown that the first coupling window 302 is located in the middle of the first resonator 10 and the second resonator 20, but it can also be arranged on the side. As long as it is located between the first resonator 10 and the second resonator 20, it belongs to the protection scope of the embodiments of the present application.

[0091] In the present application, continue to refer to Figure 3 and Figure 4 , the extension direction of the first dielectric body 101 (eg Figure 3 or Figure 4 The Y direction shown in FIG. 1 , i.e., the first direction) and the extension direction of the second dielectric body 201 (i.e., the Y direction shown in FIG. 1 , i.e., the first direction) Figure 3 or Figure 4 Therefore, the first dielectric body 101 extending along the first direction forms a certain angle α with respect to the second dielectric body 201 extending along the second direction, and the value of the angle α is any angle within the closed interval of [45°, 135°].

[0092] The embodiment of the present application is based on the first direction (such as Figure 3 or Figure 4 The Y direction shown in FIG. 1 and the second direction (as shown in FIG. Figure 3 or Figure 4The Z direction shown in FIG. 1 is set at 90° for example. That is, the second dielectric body 201 is vertically arranged on one side of the first dielectric body 101. That is, the angle α is 90°. However, it should be noted that the embodiment of the present application does not limit the value of the angle α. As long as the angle α is any angle within the closed interval of [45°, 135°], it belongs to the protection scope of the embodiment of the present application. For example, the angle α is 45°, 89°, 89.9°, 90.1°, 91°, 102°, 135°, etc.

[0093] Since the first direction and the second direction are not parallel, the first dielectric body 101 and the second dielectric body 201 are L-shaped as a whole, so that the first dielectric body 101 and the second dielectric body 201 form an accommodation space Q, and the accommodation space Q is used to add a dielectric resonator (for example, the third resonator 40 described later, such as Figure 5 and Figure 8 As shown). Thus, the dielectric filter coupling structure of the embodiment of the present application can provide a basis for miniaturization of a dielectric filter composed of multiple dielectric resonators, for example, provide a basis for reducing the physical size of a dielectric filter including three dielectric resonators; and can effectively reduce the geometric size of a dielectric filter including multiple dielectric resonators.

[0094] It can be understood that when the dielectric filter coupling structure includes the above-mentioned minimum resonance unit (first resonator 10, second resonator 20), the second resonator 20 is vertically connected to one side of the first resonator 10; when the dielectric filter coupling structure also includes the third resonator 40, the second resonator 20 is vertically connected to the same side of the first resonator 10 and the third resonator 40. In this vertically connected state, the structure of the dielectric filter including the dielectric filter coupling structure is relatively compact.

[0095] For example, reference Figure 3 and Figure 4 The first dielectric body 101 and the second dielectric body 201 are rectangular parallelepiped structures. The embodiment of the present application takes the first dielectric body 101 and the second dielectric body 201 as examples, but the present application does not limit the structures of the first dielectric body 101 and the second dielectric body 201, and they can also be other shapes.

[0096] like Figure 3 and Figure 4 As shown, the first dielectric body 101 includes a first surface A1 and a second surface A2. The first surface A1 and the second surface A2 are arranged along a thickness direction of the first dielectric body 101 (eg, Figure 3 or Figure 4 Exemplarily, the first surface A1 and the second surface A2 are arranged parallel to each other, that is, the first surface A1 and the second surface A2 are arranged along the first direction ( Figure 3 and Figure 4 The first surface A1 is provided with the above-mentioned first resonant blind hole 1011, which extends downward along the thickness direction of the first dielectric body 101, but does not extend to the second surface A2.

[0097] Continue to refer Figure 3 and Figure 4 The second dielectric body 201 of the second resonator 20 includes a third surface A4, a fourth surface A5 and a first side surface A6. The third surface A4 and the fourth surface A5 are arranged along the thickness direction of the second dielectric body 201 (eg Figure 3 or Figure 4 Exemplarily, the third surface A4 and the fourth surface A5 are arranged parallel to each other, that is, the third surface A4 and the fourth surface A5 are respectively arranged along the second direction ( Figure 3 and Figure 4 The third surface A4 is provided with the second resonant blind hole 2011, which extends rightward along the thickness direction of the second dielectric body 201, but does not extend to the fourth surface A5.

[0098] like Figure 3 and Figure 4 As shown, along the thickness direction of the second dielectric body 201 (eg Figure 3 or Figure 4 H2 direction shown in the figure), the first side surface A6 is connected between the third surface A4 and the fourth surface A5. Exemplarily, the first side surface A6 is vertically connected between the third surface A4 and the fourth surface A5. That is, the first surface A1 and the second surface A2 are respectively perpendicular to the third surface A4 and the fourth surface A5. That is, the angle α ( Figure 3 and Figure 4 shown) is 90°.

[0099] As described above, the angle α between the first dielectric body 101 and the second dielectric body 201 is any angle within the closed interval [45°, 135°]. Therefore, the angle α ( Figure 3 and Figure 4 The angle α is not limited to 90°, but may be other angles, for example, the angle α is 45°, 89°, 89.9°, 90.1°, 91°, 102°, 135°, etc.

[0100] Exemplarily, the first side surface A6 is the second dielectric body 201 along the second direction (eg Figure 3 and Figure 4 The top surface (as shown in the Z direction) Figure 3 or Figure 4 Therefore, the connection between the first surface A1 and the third surface A4 means that the third surface A4 and the first surface A1 are connected via the first side surface A6.

[0101] Exemplarily, the first surface A1 of the first dielectric body 101 and the first side surface A6 of the second dielectric body 201 are located in the same plane, wherein Figure 3 It is shown that the first surface A1 and the first side surface A6 are arranged without any interval, and correspondingly, the second surface A2 and the fourth surface A5 are connected (for example, vertically connected). Figure 4 It is shown that the first surface A1 and the first side surface A6 are arranged at intervals, and correspondingly, the second surface A2 and the fourth surface A5 are arranged at intervals.

[0102] As mentioned earlier, Figure 3 The first resonator 10 and the second resonator 20 are shown to be capacitively coupled to each other. Figure 3 It is shown that the first coupling blind hole 301 is disposed on the first surface A1 of the first dielectric body 101, and the first coupling blind hole 301 can achieve capacitive coupling between the first resonator 10 and the second resonator 20. However, the embodiment of the present application does not limit the location of the first coupling blind hole 301, and the first coupling blind hole 301 can also be disposed on the third surface A4 of the second dielectric body 201. As long as the first coupling blind hole 301 is located between the first resonator 10 and the second resonator 20, it belongs to the protection scope of the embodiment of the present application.

[0103] As mentioned earlier, Figure 4 The first resonator 10 and the second resonator 20 are inductively coupled. The first dielectric body 101 also includes a second side surface A3, and along the thickness direction of the first dielectric body 101, the second side surface A3 is connected between the first surface A1 and the second surface A2. Exemplarily, the second side surface A3 is vertically connected between the first surface A1 and the second surface A2. The second side surface A3 of the first dielectric body 101 and the fourth surface A5 of the second dielectric body 201 are connected along the first direction ( Figure 4 The first coupling window 302 is arranged between the second side surface A3 of the first dielectric body 101 and the fourth surface A5 of the second dielectric body 201. The first coupling window 302 can achieve inductive coupling between the first resonator 10 and the second resonator 20.

[0104] Specifically, the second side surface A3 of the first dielectric body 101 and the fourth surface A5 of the second dielectric body 201 are spaced apart, and the gap between the two is a separation wall. It can be understood that the separation wall, as a boundary between the first resonator 10 and the second resonator 20, can separate the first resonator 10 and the second resonator 20 into two resonant cavities. Exemplarily, the separation wall is a strip groove opened between the first dielectric body 101 and the second dielectric body 201, and air is there between.

[0105] In some possible implementations, such as Figure 3 and Figure 4 As shown, the lengthwise dimensions of the first surface A1 and the second surface A2 ( Figure 3 and Figure 4 The same as the Y direction, and the width direction ( Figure 3 and Figure 4 The dimensions of the third surface A4 and the fourth surface A5 in the length direction ( Figure 3 and Figure 4 The same as the X direction, and the width direction ( Figure 3 and Figure 4 The dimensions (shown in the Z direction) are also the same.

[0106] Exemplarily, the length directions of the third surface A4 and the fourth surface A5 ( Figure 3 and Figure 4 The dimensions of the first surface A1 and the second surface A2 in the X direction ( Figure 3 and Figure 4 That is, the width direction ( Figure 3 and Figure 4 The two sides of the second dielectric body 201 are respectively in the length direction ( Figure 3 and Figure 4 After such arrangement, it is beneficial to the compactness of the dielectric filter coupling structure and provides a basis for miniaturization of the dielectric filter composed of multiple dielectric resonators.

[0107] It should be noted that the structures of the first dielectric body 101 and the second dielectric body 201 in the embodiment of the present application are not limited thereto. In some possible implementations, the length direction of the third surface A4 and the fourth surface A5 ( Figure 3 and Figure 4 The X direction is shown in the figure) and the width direction of the first surface A1 and the second surface A2 ( Figure 3 and Figure 4 The dimensions of the first dielectric body 101 are the same as those of the first dielectric body 101 in the X direction. Figure 3 and Figure 4The two sides of the second dielectric body 201 (shown in the X direction) are Figure 3 and Figure 4 The two sides (shown in the X direction) are not aligned.

[0108] Alternatively, in some possible implementations, the length directions of the third surface A4 and the fourth surface A5 ( Figure 3 and Figure 4 The width direction of the first surface A1 and the second surface A2 ( Figure 3 and Figure 4 The dimensions (shown in the X direction) are not the same.

[0109] The dielectric filter 1 including the dielectric filter coupling structure will be described in detail below.

[0110] In one embodiment, see Figure 3 and Figure 5 , Figure 5 Shown is the inclusion Figure 3 A schematic structural diagram of a dielectric filter 1 of the provided dielectric filter coupling structure (capacitive coupling is performed between the first resonator 10 and the second resonator 20).

[0111] like Figure 5 As shown, in Figure 3 Based on the dielectric filter coupling structure shown in FIG. 1 , a third dielectric body 401, a second coupling structure 50 and a third coupling structure 60 are additionally provided. Figure 3 The minimum resonance unit shown (including the first resonator 10 and the second resonator 20 arranged non-parallel), the dielectric filter coupling structure of the embodiment of the present application includes: a first dielectric body 101, a second dielectric body 201, a third dielectric body 401, a first coupling structure 30, a second coupling structure 50 and a third coupling structure 60. That is, the third dielectric body 401, the second coupling structure 50 and the third coupling structure 60 are arranged in a receiving space Q formed by the first dielectric body 101 and the second dielectric body 201.

[0112] Exemplarily, the first dielectric body 101 , the second dielectric body 201 and the third dielectric body 401 are integrally formed.

[0113] See also Figure 5 , the third dielectric body 401 is along the first direction (such as Figure 5 The Y direction shown in FIG. 1 extends along the thickness direction of the first dielectric body 101 (eg, Figure 5 The third dielectric body 401 and the first dielectric body 101 are spaced apart. The gap between the third dielectric body 401 and the first dielectric body 101 is air.

[0114] Along the first direction (such as Figure 5The second dielectric body 201 is located on the same side of the first dielectric body 101 and the third dielectric body 401 ( Figure 5 That is, the second dielectric body 201 is disposed at an angle α with the first dielectric body 101 and the third dielectric body 401, respectively, so as to be connected to the same side of the first dielectric body 101 and the third dielectric body 401.

[0115] For example, Figure 5 As shown, the third dielectric body 401 and the first dielectric body 101 are arranged in parallel and spaced apart from each other. However, the present application does not limit this. In some possible implementations, the third dielectric body 401 and the first dielectric body 101 are not arranged in parallel.

[0116] The third dielectric body 401 of the embodiment of the present application includes a third resonant blind hole 4011. The third resonant blind hole 4011 is formed on the third dielectric body 401 along the second direction ( Figure 5 The third resonant blind hole 4011 extends downward (as shown in the Y direction) but does not penetrate the third dielectric body 401 to form a third resonator 40. The third resonant blind hole 4011 is used to change the resonant frequency of the second resonator 40, and the inner wall of the third resonant blind hole 4011 is a dielectric. That is, the third resonator 40 includes the third resonant blind hole 4011 and the surrounding dielectric.

[0117] See also Figure 5 The second coupling structure 50 includes a second coupling window 501, along the second direction (such as Figure 5 The second coupling window 501 is located between the first resonator 10 and the third resonator 40, and can realize the inductive coupling between the first resonator 10 and the third resonator 40. The third coupling structure 60 includes a third coupling window 601, and the third coupling window 601 is located between the second resonator 20 and the third resonator 40, and can realize the inductive coupling between the second resonator 20 and the third resonator 40.

[0118] In some possible implementations, the third coupling structure 60 includes a third coupling blind hole (not shown in the figure), and the third coupling blind hole is located between the second resonator 20 and the third resonator 40, so as to realize capacitive coupling between the second resonator 20 and the third resonator 40. Exemplarily, the first coupling window 302, the second coupling window 501 and the third coupling window 601 are solid ceramic bodies.

[0119] Thus, in the embodiment of the present application, capacitive coupling is achieved between the first resonator 10 and the second resonator 20 through the first coupling blind hole 301, inductive coupling is achieved between the first resonator 10 and the third resonator 40 through the second coupling window 501, and inductive coupling is achieved between the second resonator 20 and the third resonator 40 through the third coupling window 601.

[0120] Similarly, the embodiment of the present application does not limit the specific arrangement of the second coupling structure 50 and the third coupling structure 60. The coupling structures that can realize the inductive coupling between the first resonator 10 and the third resonator 40 and the inductive coupling or capacitive coupling between the second resonator 20 and the third resonator 40 all fall within the protection scope of the present application.

[0121] Exemplarily, when the third coupling structure 60 is a third coupling blind hole, the third coupling blind hole is opened in the third dielectric body 401, and the depth of the third coupling blind hole is greater than the depth of the third resonant blind hole 4011. The embodiment of the present application does not limit the depth of the third coupling blind hole, as long as its depth can be greater than the depth of the third resonant blind hole 4011, it belongs to the protection scope of the embodiment of the present application.

[0122] In addition, the third coupling blind hole may also be provided on the second dielectric body 201 (not shown in the figure), as long as it can be located between the third resonator 40 and the second resonator 20, it belongs to the protection scope of the embodiment of the present application.

[0123] The third resonator 40 and the second resonator 20 can achieve capacitive coupling through the third coupling blind hole. Exemplarily, the third coupling blind hole includes at least one, that is, the third coupling blind hole can also be set to two or three, and the embodiment of the present application does not limit the number of the third coupling blind holes. As long as the second resonator 20 and the third resonator 40 can achieve capacitive coupling, they all belong to the protection scope of the embodiment of the present application.

[0124] Figure 5 It is exemplarily shown that the second coupling window 501 is located in the middle of the first resonator 10 and the third resonator 40, but it can also be arranged on the side. As long as it is located between the first resonator 10 and the third resonator 40, it belongs to the protection scope of the embodiments of the present application.

[0125] Based on this, Figure 5 The dielectric filter coupling structure shown in FIG. 1 includes a first resonator 10, a second resonator 20 and a third resonator 40. That is, in the case of Figure 3 A third resonator 40 can be arranged in the accommodating space Q formed by the minimum resonance unit (the first resonator 10 and the second resonator 20) shown, so as to form a compact three-cavity resonator structure, effectively reducing the geometric dimensions of the dielectric filter coupling structure formed by the first resonator 10, the second resonator 20, and the third resonator 40, and meeting the application requirements (i.e., miniaturization) of the dielectric filter 1 including the dielectric filter coupling structure.

[0126] For example, although Figure 5The above-mentioned three-cavity resonator (i.e., the first resonator 10, the second resonator 20, and the third resonator 40) is only shown by way of example, but the embodiment of the present application does not limit the number of such resonators. The dielectric filter coupling structure of the embodiment of the present application may also include multi-cavity resonators such as four-cavity and five-cavity resonators.

[0127] For example, along the first direction ( Figure 5 In the embodiment shown in the Y direction in the figure, a fourth dielectric body (not shown in the figure) can be added to the right of the third dielectric body 401, and a fourth resonant blind hole (not shown in the figure) can be opened on the fourth dielectric body to form a fourth resonator (not shown in the figure). The fourth resonator extends along the first direction and is in the same plane as the third resonator 40. In this case, the dielectric filter coupling structure is a four-cavity resonator structure. Exemplarily, the fourth resonator and the third resonator 40 can achieve inductive coupling by setting a coupling window (not shown in the figure).

[0128] For another example, along the first direction ( Figure 5 A fourth resonator (not shown in the figure) is still added to the right of the third dielectric body 401, and a fifth dielectric body (not shown in the figure) is added to the right of the first dielectric body 101. A fifth resonant blind hole (not shown in the figure) is opened in the fifth dielectric body to form a fifth resonator (not shown in the figure). The fifth resonator extends along the first direction and is in the same plane as the first resonator 10, and along the second direction ( Figure 5 The fifth resonator and the fourth resonator are arranged at intervals. In this case, the dielectric filter coupling structure is a five-cavity resonator structure. Exemplarily, the fifth resonator and the first resonator, the fourth resonator and the third resonator 40, and the fifth resonator and the fourth resonator can be inductively coupled by setting a coupling window (not shown in the figure).

[0129] For example, reference Figure 5 The third dielectric body 401 mentioned above is a rectangular parallelepiped structure.

[0130] like Figure 5 As shown, the third dielectric body 401 of the third resonator 40 includes a fifth surface A7, a sixth surface A8 and a third side surface A9, the fifth surface A7 and the sixth surface A8 are arranged opposite to each other along the thickness direction of the third dielectric body 401, and the third side surface A9 is connected between the fifth surface A7 and the sixth surface A8. The third resonant blind hole 4011 is provided on the sixth surface A8 of the third resonator 40, and the third resonant blind hole 4011 extends upward along the thickness direction of the third dielectric body 401, but does not extend to the fifth surface A7.

[0131] Exemplarily, the fifth surface A7 and the sixth surface A8 are arranged parallel to each other, that is, the fifth surface A7 and the sixth surface A8 are respectively arranged along the first direction ( Figure 5The third dielectric body 401 is parallel to the first dielectric body 101. In some possible implementations, the third dielectric body 401 is not parallel to the first dielectric body 101.

[0132] like Figure 5 As shown, along the thickness direction of the third dielectric body 401, the third side surface A9 is connected between the fifth surface A7 and the sixth surface A8. Exemplarily, the third side surface A9 is vertically connected between the fifth surface A7 and the sixth surface A8. Exemplarily, the fifth surface A7 and the sixth surface A8 are perpendicular to the third surface A4 and the fourth surface A5, respectively. That is, the angle α ( Figure 3 and Figure 4 shown) is 90°.

[0133] It can also be understood that the angle α between the third dielectric body 401 and the second dielectric body 201 is any angle within the closed interval [45°, 135°]. Therefore, the angle α ( Figure 3 and Figure 4 The angle α is not limited to 90°, but may be other angles, for example, the angle α is 45°, 89°, 89.9°, 90.1°, 91°, 102°, 135°, etc.

[0134] Continue to refer Figure 5 , along the thickness direction of the first dielectric body 101 (eg Figure 5 The second surface A2 of the first resonator 10 and the fifth surface A7 of the third resonator 40 are arranged in a spaced relationship; along the thickness direction of the second dielectric body 201 (eg Figure 5 H2 direction shown in FIG), the fourth surface A5 of the second resonator 20 and the third side surface A9 of the third resonator 40 are arranged to be spaced apart.

[0135] As described above, the first resonator 10 and the third resonator 40 are inductively coupled via the second coupling window 501, and the second coupling window 501 is disposed between the second surface A2 of the first resonator 10 and the fifth surface A7 of the third resonator 40. The second resonator 20 and the third resonator 40 are inductively coupled via the third coupling window 601, and the third coupling window 601 is disposed between the fourth surface A5 of the second resonator 20 and the third side surface A9 of the third resonator 40.

[0136] Continue to refer Figure 5 The second dielectric body 201 also includes a fourth side surface A 10, along the second direction (such as Figure 5 The fourth side surface A of the second dielectric body 201 is 10 The fourth side surface A of the second dielectric body 201 is opposite to the first side surface A6. 10 Set parallel to the first side surface A6.

[0137] like Figure 5 As shown, the bottom surface 6011 of the third coupling window 601, the sixth surface A8 of the third dielectric body 401, and the fourth side surface A 10 That is, the bottom surface 6011 of the third coupling window 601 connects the sixth surface A8 of the third dielectric body 401 and the fourth side surface A9 of the second dielectric body 201. 10 However, the embodiment of the present application does not limit the position of the bottom surface 6011 of the third coupling window 601, and the bottom surface 6011 of the third coupling window 601 may not be aligned with the sixth surface A8 and the fourth side surface A9. 10 The connections are in the same plane.

[0138] In some possible implementations, such as Figure 5 As shown, the length directions of the fifth surface A7 and the sixth surface A8 of the third dielectric body 401 ( Figure 5 For example, the length direction (indicated in the Y direction) of the third surface A4 and the fourth surface A5 is the same. Figure 3 and Figure 4 X direction) and the width direction of the fifth surface A7 and the sixth surface A8 ( Figure 3 and Figure 4 That is, the width direction ( Figure 5 The two sides of the second dielectric body 201 (in the X direction) and the length direction ( Figure 5 The two sides of the third dielectric body 401 (shown in the X direction) and the width direction ( Figure 5 The two side surfaces (shown in the X direction) are aligned respectively.

[0139] This arrangement is beneficial to the compactness of the dielectric filter coupling structure and provides a basis for miniaturization of the dielectric filter composed of multiple dielectric resonators. Figure 5 The filter structure shown is a rectangular parallelepiped structure as a whole, that is, the filter 1 in a rectangular parallelepiped structure includes a first resonator 10 , a second resonator 20 and a third resonator 40 in three rectangular parallelepiped structures.

[0140] It should be noted that the structure of the third dielectric body 401 in the embodiment of the present application is not limited thereto. In some possible implementations, the length direction ( Figure 5X direction) and the width direction of the fifth surface A7 and the sixth surface A8 ( Figure 3 and Figure 4 The dimensions of the third dielectric body 401 are the same as those of the third dielectric body 401 in the width direction ( Figure 5 The two sides of the second dielectric body 201 (shown in the X direction) are Figure 5 The two sides (shown in the X direction) are not aligned.

[0141] Alternatively, in some possible embodiments, the length directions of the third surface A4 and the fourth surface A5 (eg Figure 5 The X direction shown in FIG. 1 ) and the width direction of the fifth surface A7 and the sixth surface A8 (as shown in FIG. Figure 5 The dimensions (in the X direction) are not the same.

[0142] In summary, in this embodiment, capacitive coupling is achieved between the first resonator 10 and the second resonator 20 through the first coupling blind hole 301, inductive coupling is achieved between the first resonator 10 and the third resonator 40 through the second coupling window 501, and inductive coupling is achieved between the second resonator 20 and the third resonator 40 through the third coupling window 601.

[0143] Continue reading Figure 5 , the embodiment of the present application provides a dielectric filter 1 further comprising an input signal source 70 and an output load 80. Exemplarily, the input signal source 70 is signal-connected to the third resonator 40, and the output load 80 is signal-connected to the first resonator 10, but the embodiment of the present application does not limit this. In some possible implementations, the input signal source 70 is signal-connected to the first resonator 10, and the output load 80 is signal-connected to the third resonator 40.

[0144] See also Figure 6 , Figure 6 for Figure 5 A schematic diagram of a topological model of a dielectric filter 1 is provided. After a signal is input through an input signal source 70, it can be directly output through an output load 80, or it can flow through the second resonator 20 and then output through the output load 80. Figure 6 As shown, the signal flow includes two transmission paths R1 and R2, the path R1 is the third resonator 40-first resonator 10, and the path R2 is the third resonator 40-second resonator 20-first resonator 10 (as shown in FIG. Figure 3 The dashed arrows in the figure show the signal flow direction).

[0145] See also Figure 7 , Figure 7 yes Figure 5 The simulation result diagram of the dielectric filter 1 provided is as follows. The dielectric filter 1 in this solution can achieve the following Figure 7The frequency response shown, for example, is about 1.8 GHz to 1.9 GHz, which can achieve a transmission zero point on the left side of the passband. It can be understood that the above dielectric filter coupling structure (such as Figure 3 The dielectric filter 1 (as shown) can also realize a transmission zero point, thereby effectively improving the out-of-band suppression capability and selection performance of the dielectric filter 1.

[0146] In another embodiment, see Figure 4 and Figure 8 , Figure 8 Shows Figure 4 A schematic structural diagram of a dielectric filter 1 of the provided dielectric filter coupling structure (inductive coupling is performed between the first resonator 10 and the second resonator 20).

[0147] Figure 8 The structure of the dielectric filter 1 shown in FIG. Figure 5 The structure of the dielectric filter 1 shown is different in that the specific structure of the first coupling structure 30 is different. Figure 5 The first coupling structure 30 of the dielectric filter 1 shown in FIG. 1 is a first coupling blind hole 301, and Figure 8 The first coupling structure 30 of the dielectric filter 1 shown in FIG. 1 is a first coupling window 302. Figure 8 The specific structures of the first dielectric body 101 and the second dielectric body 201 shown in FIG. Figure 4 The relevant description will not be repeated here.

[0148] also, Figure 8 The structure of the third resonator 40 in the dielectric filter 1 is shown Figure 5 The structure of the third resonator 40 in the dielectric filter 1 shown is the same, that is, the structure of the third dielectric body 401 is the same, and the details can be referred to above. Figure 5 Related description. Figure 8 The dielectric filter 1 and Figure 5 The third resonator 40 in the dielectric filter 1 shown has a similar relative positional relationship and connection relationship to the first resonator 10 and the second resonator 20 .

[0149] For example, see Figure 8, the first dielectric body 101 of the first resonator 10 includes the above-mentioned first surface A1, the above-mentioned second surface A2 and the above-mentioned second side surface A3. The second dielectric body 201 of the second resonator 20 includes the above-mentioned third surface A4, the above-mentioned fourth surface and the above-mentioned first side surface A6. The third dielectric body 401 of the third resonator 40 includes the above-mentioned fifth surface A7, the above-mentioned sixth surface A8 and the above-mentioned third side surface A9. The relative positional relationship and connection relationship of the fifth surface A7, the sixth surface A8 and the third side surface A9 of the third dielectric body 401 of the third resonator 40 and the respective surfaces / side surfaces of the first resonator 10 and the respective surfaces / side surfaces of the second resonator 20 can be referred to the above description of Figure 5 Related description.

[0150] For example, along the thickness direction of the first dielectric body 101 (eg Figure 8 The second surface A2 of the first resonator 10 and the fifth surface A7 of the third resonator 40 are arranged in a spaced relationship; along the thickness direction of the second dielectric body 201 (eg Figure 8 H2 direction shown in FIG), the second side surface A3 of the first resonator 10 and the fourth surface A5 of the second resonator 20 are spaced apart, and the fourth surface A5 of the second resonator 20 and the third side surface A9 of the third resonator 40 are spaced apart.

[0151] For another example, the first resonance blind hole 1011 is disposed on the first surface A1, the second resonance blind hole 2011 is disposed on the third surface A4, the third resonance blind hole 4011 is disposed on the sixth surface A8, the first coupling window 302 is disposed between the second side surface A3 of the first resonator 10 and the fourth surface A5 of the second resonator 20, the second coupling window 501 is disposed between the second surface A2 of the first resonator 10 and the fifth surface A7 of the third resonator 40, and the third coupling window 601 is disposed between the fourth surface A5 of the second resonator 20 and the third side surface A9 of the third resonator 40.

[0152] That is, in this embodiment, Figure 8 In the dielectric filter 1 shown, inductive coupling is achieved between the first resonator 10 and the second resonator 20 , inductive coupling is achieved between the first resonator 10 and the third resonator 40 , and inductive coupling is achieved between the second resonator 20 and the third resonator 40 .

[0153] Please refer to Fig. 9 , Fig. 9 for Figure 8 The topological model diagram of the dielectric filter 1 is provided. It can be understood that the signal flow in this embodiment also includes two transmission paths R3 and R4, that is, the path R3 is the third resonator 40-first resonator 10, and the path R4 is the third resonator 40-second resonator 20-first resonator 10 (such as Figure 4 The dashed arrows in the figure show the signal flow direction).

[0154] Further reading Fig.10 , Fig.10 yes Figure 8 The simulation result diagram of the dielectric filter 1 in the second embodiment is provided. At this time, the dielectric filter 1 in this embodiment can achieve the following Fig.10 The frequency response shown, for example, is about 1.8Ghz-1.9Ghz, which can achieve a transmission zero point on the right side of the passband. It can be understood that the above dielectric filter coupling structure ( Figure 4 The dielectric filter 1 (as shown) can also realize a transmission zero point, thereby effectively improving the out-of-band suppression capability and selection performance of the dielectric filter 1.

[0155] The foregoing text has exemplarily described the coupling structure of the embodiment of the present application. However, the arrangement form of the coupling structure in the dielectric filter coupling structure of the embodiment of the present application is not limited thereto.

[0156] In other practicable schemes (not shown in the figure), the coupling form between the first resonator, the second resonator and the third resonator may also include: for example, a third coupling blind hole is provided between the second resonator and the third resonator, so that capacitive coupling can be achieved between the second resonator and the third resonator. Exemplarily, the fourth surface of the second resonator and the third side surface of the third resonator are in contact with each other, which can be understood as the second dielectric body and the third dielectric body being integrally formed; Exemplarily, the second side surface of the first resonator and the fourth surface of the second resonator are spaced apart, and the above-mentioned first coupling window is provided between the second side surface and the fourth surface, so that inductive coupling can be achieved between the first resonator and the second resonator; In addition, the second surface of the first resonator and the fifth surface of the third resonator are spaced apart, and the above-mentioned second coupling window is provided between the second surface and the fifth surface, so that inductive coupling can be achieved between the first resonator and the third resonator.

[0157] In summary, the present application provides a dielectric filter coupling structure of a minimum resonator unit (including a first resonator and a second resonator) that is not arranged in parallel, which can provide a basis for reducing the size and compact arrangement of a dielectric filter including multiple dielectric resonators; at the same time, compared with the existing designs of coplanar resonator coupling structures and opposite resonator coupling structures, the dielectric filter of the present application can achieve a transmission zero point, thereby effectively improving the out-of-band suppression capability and selection performance.

Claims

1. A dielectric filter coupling structure, characterized in that: include: A first dielectric body extending along a first direction, wherein the first dielectric body comprises a first resonant blind hole to form a first resonator; A second dielectric body extending along a second direction and located at one side of the first dielectric body along the first direction, the second dielectric body comprising a second resonant blind hole to form a second resonator, the first direction and the second direction being non-parallel; The first medium body and the second medium body form a containing space; A first coupling structure is provided between the first resonator and the second resonator, so that the first resonator and the second resonator are capacitively coupled or inductively coupled.

2. The dielectric filter coupling structure according to claim 1, characterized in that: The dielectric filter coupling structure further comprises a third dielectric body, a second coupling structure and a third coupling structure, wherein: The third dielectric body is located in the accommodation space, the third dielectric body extends along the first direction, and the third dielectric body includes a third resonant blind hole to form a third resonator; The third dielectric body and the first dielectric body are spaced apart from each other along the thickness direction of the first dielectric body, and the second dielectric body is located on the same side of the first dielectric body and the third dielectric body along the first direction; The second coupling structure is disposed between the first resonator and the third resonator, so that the first resonator and the third resonator are inductively coupled; The third coupling structure is disposed between the second resonator and the third resonator, so that the second resonator and the third resonator are capacitively coupled or inductively coupled.

3. The dielectric filter coupling structure according to claim 2, characterized in that: The second coupling structure includes a second coupling window located between the first resonator and the third resonator.

4. The dielectric filter coupling structure according to claim 2 or 3, characterized in that: The third coupling structure includes a third coupling blind hole, and the third coupling blind hole is located between the second resonator and the third resonator.

5. The dielectric filter coupling structure according to claim 2 or 3, characterized in that: The third coupling structure includes a third coupling window, and the third coupling window is located between the second resonator and the third resonator.

6. The dielectric filter coupling structure according to any one of claims 1 to 5, characterized in that: The first direction and the second direction are arranged at 90°.

7. The dielectric filter coupling structure according to any one of claims 1 to 6, characterized in that: Along the thickness direction of the first dielectric body, the first dielectric body comprises a first surface and a second surface which are arranged opposite to each other, and the first surface is provided with the first resonant blind hole; Along the thickness direction of the second dielectric body, the second dielectric body includes a third surface and a fourth surface that are arranged opposite to each other, the third surface is provided with the second resonant blind hole; the third surface is connected to the first surface, and the fourth surface is connected to the second surface; The first coupling structure includes a first coupling blind hole, which is arranged on the first surface and located between the first resonator and the second resonator.

8. The dielectric filter coupling structure according to claim 7, characterized in that: The first coupling blind hole is arranged on the first surface or the third surface.

9. The dielectric filter coupling structure according to claim 7 or 8, characterized in that: The second dielectric body further includes a first side surface, the third surface is connected to the first surface via the first side surface, and the first side surface and the first surface are in the same plane.

10. The dielectric filter coupling structure according to any one of claims 1 to 6, characterized in that: Along the thickness direction of the first dielectric body, the first dielectric body comprises a first surface and a second surface and a second side surface which are arranged opposite to each other, and the first surface is provided with the first resonant blind hole; Along the thickness direction of the second dielectric body, the second dielectric body includes a third surface and a fourth surface and a first side surface which are arranged opposite to each other, the fourth surface and the second side surface are arranged at intervals along the first direction, the first side surface and the first surface are in the same plane, and the third surface is provided with the second resonant blind hole; The first coupling structure includes a first coupling window, which is located between the fourth surface and the second side surface. Along the thickness direction of the first dielectric body, the top surface of the coupling window is in the same plane as the first side surface and the first surface.

11. The dielectric filter coupling structure according to any one of claims 2 to 10, characterized in that: The first dielectric body, the second dielectric body and the third dielectric body are integrally formed.

12. The dielectric filter coupling structure according to any one of claims 2 to 11, characterized in that: The first dielectric body, the second dielectric body and the third dielectric body are respectively rectangular parallelepiped structures.

13. A dielectric filter, characterized in that: It comprises an input signal source, an output load and the dielectric filter coupling structure according to any one of claims 1 to 11.

14. A communication device, characterized in that: Includes the dielectric filter as claimed in claim 12.

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