An inter-cavity coupling structure, filter and communication device

Abstract

The utility model discloses a cavity intercoupling structure, filter and communication device, this cavity intercoupling structure includes the coupling window of the public wall between two resonators, at least one resonator in two resonators is multimode resonator, the coupling window is along the public wall vertical direction and is set up and penetrates public wall top -end, and the top horizontal width of coupling window along its vertical direction is greater than the bottom horizontal width. The utility model provides the coupling window of multimode resonator, adopts this coupling window can reduce cavity processing procedure, reduces the processing difficulty, increases cavity open mould feasibility, and the production cost is reduced greatly.

Description

TECHNICAL FIELD

[0001] The utility model belongs to communication technical field, concretely relates to a cavity intercoupling structure, filter and communication device. BACKGROUND

[0002] With the rapid development of the fourth generation mobile communication to the fifth generation mobile communication, the requirement of miniaturization and high performance of communication equipment is higher and higher. The traditional single mode cavity filter disclosed by the related technology is gradually replaced by single mode dielectric filter because of its large metal cavity volume and general performance. The single mode dielectric filter generally adopts single mode resonance mode. Although this resonance mode can improve certain Q value, it has the defects of high manufacturing cost and large volume.

[0003] In order to solve the technical problems of high cost and large volume of single mode dielectric filter, multi-mode dielectric filter emerges as the times require. In the related technology, in order to form transmission zero point between multi-mode resonant cavity and single-mode resonant cavity, see Figure 1 The coupling window between the multi-mode resonant cavity and the single-mode resonant cavity of one scheme is a high transverse window parallel to the cover plate direction. The wider the window width, the greater the coupling between the multi-mode resonant cavity and the single-mode resonant cavity. The greater the window height, the stronger the coupling strength of the cross coupling between the multi-mode resonant cavity and the single-mode resonant cavity. See Figure 2 The coupling window between the multi-mode resonant cavity and the single-mode resonant cavity of another scheme is composed of a transverse window parallel to the cover plate direction and a vertical window perpendicular to the cover plate direction. The wider the window width parallel to the cover plate direction, the greater the coupling between the multi-mode resonant cavity and the single-mode resonant cavity. The deeper the window depth perpendicular to the cover plate direction, the stronger the coupling strength of the cross coupling between the multi-mode resonant cavity and the single-mode resonant cavity. The farther the window from the center, the stronger the coupling strength of the cross coupling between the multi-mode resonant cavity and the single-mode resonant cavity.

[0004] Although the two schemes can effectively realize the coupling between the multi-mode resonant cavity and the single-mode resonant cavity and form transmission zero point, special T-shaped tool is needed for processing, and the process of cavity processing is more and the cost is high. INVENTION CONTENTS

[0005] The utility model aims at overcoming at least one defect in the related art, and provides a cavity intercoupling structure, a filter and a communication device.

[0006] In a first aspect, the utility model provides a cavity intercoupling structure, which comprises a coupling window arranged on a common wall between two resonators, at least one of the two resonators is a multi-mode resonator, the coupling window is arranged vertically along the common wall and penetrates the top end of the common wall, and the horizontal width of the top of the coupling window is greater than that of the bottom.

[0007] In some embodiments, the coupling window is a reverse triangular window or a reverse trapezoidal window.

[0008] In some embodiments, the angle between the sidewall of the window and the vertical direction of the common wall is greater than 0° and less than 90°.

[0009] In some embodiments, the angle between the sidewall of the window and the vertical direction of the common wall is greater than 5° and less than 90°.

[0010] In some embodiments, the coupling window is divided into multiple sections along the vertical direction of the common wall, and the horizontal window width of each section is sequentially reduced from top to bottom, forming a stepped window with a wide top and a narrow bottom.

[0011] In some embodiments, the bottom section of the window is a rectangular window, a reverse trapezoidal window or a reverse triangular window, and the other sections are rectangular windows or reverse trapezoidal windows.

[0012] In some embodiments, the top horizontal width of the coupling window is positively correlated with the inter-cavity coupling strength;

[0013] The vertical depth of the coupling window is positively correlated with the inter-cavity coupling strength;

[0014] The slope of the change of the inter-cavity coupling strength with the increase of the top horizontal width is greater than the slope of the change of the inter-cavity coupling strength with the increase of the vertical depth;

[0015] And / or,

[0016] The vertical depth of the coupling window is positively correlated with the coupling strength of the cross-coupling;

[0017] And / or,

[0018] The horizontal offset of the vertical center line of the coupling window from the vertical center line of the common wall is positively correlated with the coupling strength of the cross-coupling.

[0019] In a second aspect, the utility model provides a filter, including a cavity, be provided with multiple resonators in the cavity, multiple resonators at least contain one multimode resonator, still be provided with at least one cavity intercoupling structure as described in first aspect in the cavity.

[0020] In some embodiments, the multimode resonator of the two resonators coupled by the cavity intercoupling structure includes a multimode resonant cavity and a multimode dielectric body assembled in the multimode resonant cavity.

[0021] In some embodiments, of the two resonators coupled by the cavity intercoupling structure, one is a multimode resonator, and the other is a single-mode resonator or a multimode resonator.

[0022] In some embodiments, the single-mode resonator includes a single-mode resonant cavity and a resonant rod assembled in the single-mode resonant cavity.

[0023] In some embodiments, a cover plate is fixed to the top of the cavity.

[0024] In a third aspect, the utility model provides a kind of communication equipment, including the filter as described in second aspect.

[0025] The utility model at least has following beneficial effects:

[0026] The utility model discloses a kind of coupling windows for realizing the coupling between multimode resonator and single-mode resonator (or multimode resonator), coupling window is opened along the vertical direction of public wall and penetrates the top end of public wall, top window width is maximum, window width gradually decreases from top to bottom, the coupling between multimode resonant cavity and single-mode resonant cavity (or multimode resonant cavity) is adjusted by window top horizontal width and vertical direction depth, the cross coupling between multimode resonant cavity and single-mode resonant cavity (or multimode resonant cavity) is adjusted by window vertical direction depth and horizontal offset compared with public wall.The coupling window of the utility model can reduce cavity processing procedure, reduce processing difficulty, increase cavity mold opening feasibility, greatly reduce manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or related technologies, the drawings needed to be used in the embodiment or related technology description will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 The structure diagram of a cavity inter-coupling structure provided by related technologies is shown.

[0029] Figure 2 The structure diagram of another cavity inter-coupling structure provided by related technologies is shown.

[0030] Figure 3 The structure diagram of a cavity inter-coupling structure provided by the first embodiment of the utility model is shown.

[0031] Figure 4 The structure diagram of a cavity inter-coupling structure provided by the second embodiment of the utility model is shown.

[0032] Figure 5 The structure diagram of a cavity inter-coupling structure provided by the third embodiment of the utility model is shown.

[0033] Figure 6The structure schematic diagram of the inter-cavity coupling structure provided by the fourth embodiment of the utility model is shown in the figure;

[0034] Figure 7 The structure schematic diagram of the inter-cavity coupling structure provided by the fifth embodiment of the utility model is shown in the figure;

[0035] Figure 8 The structure schematic diagram of the inter-cavity coupling structure provided by the sixth embodiment of the utility model is shown in the figure;

[0036] Figure 9 The structure schematic diagram of the inter-cavity coupling structure provided by the seventh embodiment of the utility model is shown in the figure;

[0037] Figure 10 The structure schematic diagram of the filter provided by one embodiment of the utility model is shown in the figure;

[0038] Figure 11 The response schematic diagram of the S parameter (scattering parameter) of the filter provided by one embodiment of the utility model is shown in the figure.

[0039] In the figure, 1 is a cavity, 2 is a cover plate, 3 is a common wall, 4 is a coupling window, 5 is a multimode dielectric body, 6 is a resonant rod, 7 is a first signal transmission port, 8 is a second signal transmission port, 9 is a first tuning screw, and 10 is a second tuning screw. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0041] In the description of the utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0042] The terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of technical features. Thus, features defined with "first", "second" can explicitly or implicitly include one or more of the features; in the description of the utility model, unless otherwise stated, the meaning of "a plurality of", "several" is two or more.

[0043] In view of the defects in the above related technologies, how to obtain a kind of coupling between each multimode resonant cavity and single mode resonant cavity and the formation of transmission zero point without special tool and reduce the process of cavity 1 is the new direction of reducing the cost of multimode dielectric filter.

[0044] The technical problem to be solved by the utility model is to provide a coupling window 4 of multimode resonator and a multimode dielectric filter containing the coupling window 4, which can reduce the machining process of cavity 1, increase the mold opening feasibility of cavity 1 and greatly reduce the manufacturing cost.

[0045] To effectively improve, even completely solve the above problems existing in the related art, the present disclosure provides a corresponding solution.

[0046] Referring to Figures 3 to 9 The utility model embodiment provides a cavity intercoupling structure, including the coupling window 4 being set on the common wall 3 between two resonators, at least one resonator in the two resonators is multimode resonator, the coupling window 4 is set along the vertical direction of common wall 3 (the vertical direction is the direction perpendicular to the cover plate 2) and penetrates the top end of common wall 3, and the top horizontal width along the vertical direction of coupling window 4 is greater than the bottom horizontal width, forming the window structure of wide at the top and narrow at the bottom.

[0047] The utility model discloses a mode for being applied to multimode dielectric filter and realizing the coupling between multimode resonator and single mode resonator (or multimode resonator), and the coupling window 4 is set on the coupling window 4 of common wall 3 between multimode resonator and single mode resonator (or multimode resonator), is opened from the top of cavity 1 to the bottom of cavity 1, the maximum width of top window, the window width gradually reduces from top to bottom, the coupling between multimode resonant cavity and single mode resonant cavity (or multimode resonant cavity) is adjusted by the horizontal width and vertical direction depth of window top, and the cross coupling between multimode resonant cavity and single mode resonant cavity (or multimode resonant cavity) is adjusted by the vertical direction depth of window and the horizontal offset compared with common wall 3. In the same case, compared with the scheme of special T-shaped tool processing, the coupling window 4 structure of the utility model has low processing difficulty, so that cavity 1 can be mold opened, and the cost of cavity 1 processing is reduced.

[0048] And the coupling window 4 of the multi-mode resonator can realize cross coupling to generate zero points in addition to direct coupling.

[0049] In some embodiments, the horizontal cross-sectional width of the coupling window 4 decreases from top to bottom.

[0050] In some embodiments, the coupling window 4 is an inverted triangular window or an inverted trapezoidal window.

[0051] As shown in Figure 3 and Figure 6 In some embodiments, the coupling window 4 between the multi-mode resonant cavity and the single-mode resonant cavity is an inverted triangular window, the wider the horizontal width of the top of the window, the greater the coupling between the multi-mode resonant cavity and the single-mode resonant cavity; the deeper the vertical depth of the window, the stronger the coupling strength of the cross coupling between the multi-mode resonant cavity and the single-mode resonant cavity; the farther the horizontal offset of the triangular vertex at the bottom of the window from the vertical center line of the common wall 3, the stronger the coupling strength of the cross coupling between the multi-mode resonant cavity and the single-mode resonant cavity.

[0052] As shown in Figure 4 and Figure 7 In some embodiments, the coupling window 4 between the multi-mode resonant cavity and the single-mode resonant cavity is an inverted trapezoidal window, the wider the horizontal width of the top of the window, the greater the coupling between the multi-mode resonant cavity and the single-mode resonant cavity; the deeper the vertical depth of the window, the stronger the coupling strength of the cross coupling between the multi-mode resonant cavity and the single-mode resonant cavity; the farther the horizontal offset of the lower base center of the trapezoidal at the bottom of the window from the vertical center line of the common wall 3, the stronger the coupling strength of the cross coupling between the multi-mode resonant cavity and the single-mode resonant cavity.

[0053] The above-mentioned cross coupling refers to non-adjacent coupling that generates a transmission zero point. For example, there is coupling between multi-mode modes 1, 2, 3 and single-mode cavity 4, and the above-mentioned cross coupling refers to the coupling between 1 and 4. For another example, there is coupling between multi-mode modes 1, 2 and single-mode cavity 3, and the above-mentioned cross coupling refers to the coupling between 1 and 3.

[0054] In some embodiments, the coupling window 4 is divided into multiple segments along the vertical direction of the common wall 3, and the multiple segments of the window are sequentially connected from top to bottom, and the horizontal cross-sectional width of each segment of the window decreases (or decreases in gradient) from top to bottom, forming a stepped window that is wide at the top and narrow at the bottom. As shown in Figure 9 The width of each segment of the window is fixed, but the overall presents an orderly decreasing trend of "wide at the top and narrow at the bottom" along the vertical direction. Of course, as shown in Figure 5 and Figure 8 The width of each segment of the window can decrease smoothly from top to bottom.

[0055] In some embodiments, the bottom segment of the window is a rectangular window, an inverted trapezoidal window or an inverted triangular window, and each of the other segments of the window is a rectangular window or an inverted trapezoidal window.

[0056] In some embodiments, the angle between at least one sidewall of the window and the vertical direction of the common wall 3 is greater than 0° and less than 90°.

[0057] It should be noted that if cavity 1 is processed using a mold, in order to facilitate the removal of cavity 1 from the mold, the angle between the inclined surface of the window sidewall and the sidewall of cavity 1 shall be no less than 5°.

[0058] In some embodiments, the top horizontal width of the coupling window 4 is positively correlated with the inter-cavity coupling strength. The wider the top horizontal width of the window, the greater the coupling between the multimode resonant cavity (or multimode resonator) and the single-mode resonant cavity (or single-mode resonator).

[0059] The vertical depth of coupling window 4 is positively correlated with the coupling strength between cavities. The deeper the vertical depth of the window, the greater the coupling between the multimode resonant cavity (or multimode resonator) and the single-mode resonant cavity (or single-mode resonator).

[0060] The slope of the intercavity coupling strength as the top horizontal width increases is greater than the slope of the intercavity coupling strength as the vertical depth increases.

[0061] In some embodiments, the vertical depth of the coupling window 4 is positively correlated with the proximity of the transmission zero to the passband. The greater the vertical depth of the window, the stronger the cross-coupling between the multimode resonator and the single-mode resonator (or the multimode resonator).

[0062] In some embodiments, the horizontal offset of the vertical centerline of the coupling window 4 relative to the vertical centerline of the common wall 3 is positively correlated with the coupling strength of the cross-coupling between the multimode resonator and the single-mode resonator (or the multimode resonator). The greater the horizontal offset of the bottom center of the window relative to the vertical centerline of the cavity wall, the stronger the cross-coupling between the multimode resonator and the single-mode resonator (or the multimode resonator).

[0063] Common wall 3 is the common cavity wall between the resonant cavities of the two resonators. The resonant cavity can be a square cavity or a circular cavity, etc. Figures 3-5 The resonant cavity is shown to be of square cavity type. Figures 6-8 This shows that the resonant cavity is in the form of a circular cavity.

[0064] Based on the same inventive concept, this disclosure also provides a filter, including a cavity 1, within which a plurality of resonators are disposed, at least one of which is a multimode resonator. The cavity 1 also contains at least one inter-cavity coupling structure as described in any of the above embodiments. A description of this inter-cavity coupling structure can be found in the preceding embodiments and will not be repeated here. At least one pair of resonators within the filter is coupled through the inter-cavity coupling structure, and at least one of the two resonators coupled through the inter-cavity coupling structure is a multimode resonator.

[0065] In some embodiments, of the two resonators coupled through the cavity coupling structure, one is a multimode resonator and the other is a single-mode resonator or a multimode resonator.

[0066] In some embodiments, the cavity 1 is provided with at least one multimode resonator that generates multimode resonance and one cavity single-mode resonator, the multimode resonator and the cavity single-mode resonator are arranged adjacent to each other, and an inter-cavity coupling structure is provided between the multimode resonator and the cavity single-mode resonator.

[0067] In some embodiments, the multimode resonator includes a multimode resonant cavity and a multimode dielectric body 5 assembled within the multimode resonant cavity. The dielectric body can be assembled within the multimode resonant cavity by means of screws, crimping, bonding, welding, or other methods.

[0068] In some embodiments, the single-mode resonator includes a single-mode resonant cavity and a resonant rod 6 assembled within the single-mode resonant cavity. The resonant rod 6 can be assembled within the single-mode resonant cavity by means of screws, crimping, bonding, welding, or other methods.

[0069] In some embodiments, cavity 1 is provided with only a multimode dielectric cavity and a metal cavity. A multimode dielectric body 5 is assembled in the multimode dielectric cavity, and a resonant rod 6 is assembled in the metal cavity. The multimode dielectric body 5 is connected to a first signal transmission port 7, and the resonant rod 6 is connected to a second signal transmission port 8.

[0070] In some embodiments, such as Figure 10 As shown, this utility model provides a multimode dielectric filter, including a single-mode metallic resonant cavity, a multimode dielectric resonant cavity (such as a trimode dielectric cavity), and a coupling window 4 located on a common wall 3 between the multimode dielectric resonant cavity and the single-mode metallic resonant cavity. The coupling window 4 is an inverted trapezoidal window. The length, width, and height of each cavity wall of the filter are 28mm × 28mm × 28mm, respectively. The upper base of the inverted trapezoidal window is 16.3mm wide, the lower base is 4mm wide, and the depth is 22mm. The center of the lower base of the inverted trapezoidal window is offset by 3.5mm in the horizontal direction relative to the vertical centerline of the common wall 3. Simulation results are shown below. Figure 11 As shown, two transmission zeros are formed.

[0071] In some embodiments, the filter of the present invention further includes a cover plate 2 fixed to the top of the cavity 1.

[0072] In some embodiments, the filter of this invention may further include a first tuning screw 9, one end of which is fixed to the cover plate 2, and the other end extends into the cavity provided in the resonant rod 6. The cavity may preferably be located at the center of the resonant rod 6.

[0073] In some embodiments, the filter of this invention may further include a second tuning screw 10, one end of which is fixed to the cover plate 2, and the other end extends into a cavity provided in the center of the multimode dielectric body 5. The cavity may preferably be located in the center of the multimode dielectric body 5.

[0074] It should be noted that the appendix Figure 10 The illustration shows a filter consisting of two resonant cavities. This illustration is for illustrative purposes only and does not limit the technical solutions of this disclosure. The filter of this disclosure may include three or more resonant cavities. Other features of the filter, such as coupling between multimode media, chamfering of cavity 1, etc., are also described. Figure 10 None of them are shown in the text.

[0075] Based on the same inventive concept, this disclosure also provides a communication device, including a filter as described in any of the above embodiments.

[0076] The present invention aims to reduce the processing steps of the cavity 1 of the multimode dielectric filter, provide a new way of coupling between the multimode resonant cavity and the single-mode resonant cavity or the multimode resonant cavity, and further reduce the manufacturing cost of the cavity 1 of the multimode dielectric filter.

[0077] The cavity coupling structure of this invention (i.e., the coupling window 4 of the multimode resonator) can be used in all base station filters, antenna feeder filters, combiners and anti-interference filters in the field of wireless communication. The types of filters (i.e. filters containing the above-mentioned coupling window 4) can be bandpass, bandstop, high-pass and low-pass.

[0078] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cavity coupling structure, comprising a coupling window formed on a common wall between two resonators, wherein at least one of the two resonators is a multimode resonator, characterized in that: The coupling window is opened vertically along the common wall and extends through the top of the common wall, with the top horizontal width of the coupling window being greater than the bottom horizontal width.

2. The intercavity coupling structure as described in claim 1, characterized in that: The coupling window is an inverted triangle window or an inverted trapezoidal window.

3. The intercavity coupling structure as described in claim 2, characterized in that: The angle between at least one side wall of the window and the vertical direction of the common wall is greater than 0° and less than 90°.

4. The intercavity coupling structure as described in claim 3, characterized in that: The angle between at least one side wall of the window and the vertical direction of the common wall is greater than 5° and less than 90°.

5. The intercavity coupling structure as described in claim 1, characterized in that: The coupling window is divided into multiple segments along the vertical direction of the common wall. The horizontal window width of each segment decreases from top to bottom, forming a stepped window that is wider at the top and narrower at the bottom.

6. The intercavity coupling structure as described in claim 5, characterized in that: The bottommost window segment is a rectangular window, an inverted trapezoidal window, or an inverted triangle window, while the other window segments are rectangular windows or inverted trapezoidal windows.

7. The intercavity coupling structure as described in claim 1, characterized in that: The top horizontal width of the coupling window is positively correlated with the intercavity coupling strength; The vertical depth of the coupling window is positively correlated with the intercavity coupling strength; The slope of the intercavity coupling strength as the top horizontal width increases is greater than the slope of the intercavity coupling strength as the vertical depth increases. And / or, The vertical depth of the coupling window is positively correlated with the coupling strength of the cross coupling; And / or, The horizontal offset of the vertical centerline of the coupling window relative to the vertical centerline of the common wall is positively correlated with the coupling strength of the cross coupling.

8. A filter, comprising a cavity, wherein a plurality of resonators are disposed within the cavity, and at least one of the resonators is a multimode resonator, characterized in that: The cavity is further provided with at least one intercavity coupling structure as described in any one of claims 1 to 7.

9. The filter as described in claim 8, characterized in that: The multimode resonator in the two resonators coupled through the cavity coupling structure includes a multimode resonant cavity and a multimode dielectric body assembled in the multimode resonant cavity.

10. A communication device, characterized in that: Includes the filter as described in claim 8 or 9.

Images