CN115441139B - Filter - Google Patents
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- CN115441139B CN115441139B CN202211203433.8A CN202211203433A CN115441139B CN 115441139 B CN115441139 B CN 115441139B CN 202211203433 A CN202211203433 A CN 202211203433A CN 115441139 B CN115441139 B CN 115441139B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2082—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with multimode resonators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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Abstract
The invention discloses a filter, which comprises a cavity and a cover plate, wherein at least two adjacent dielectric dual-mode resonant cavities are arranged in the cavity, a coupling window is arranged between the two adjacent dielectric dual-mode resonant cavities, dielectric resonators are arranged in the dielectric dual-mode resonant cavities, the side wall of each dielectric resonator is provided with a coupling regulating missing part or coupling regulating protruding part for changing coupling between the dual modes, the coupling regulating missing part or coupling regulating protruding part of one dielectric resonator in the two adjacent dielectric dual-mode resonant cavities is positioned at the left and right directions, and the coupling regulating missing part or coupling regulating protruding part of the other dielectric resonator is positioned at the front and rear directions. The invention facilitates the filter to form symmetrical zero points, thereby improving the inhibition capability of the filter on the premise of not adding any parts.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a filter.
Background
The filters of the prior art generally adopt a cross resonance structure or a flat spliced resonance structure, and electromagnetic fields of the filters are in horizontal and vertical orthogonal forms and are applied to a fundamental mode dual mode.
When the filter adopts the cross resonance structure, the cross structure is required to be contacted with four end faces of the cavity, but the side edges of the cross structure are difficult to be in complete matching contact with the cavity wall in production and manufacture.
When the filter adopts a flat resonant structure, most schemes adopted by the flat resonant structure are in a splicing mode, so that the overall performance of the filter is influenced by the connection of the two resonant structures, and inconvenience is brought to production.
Disclosure of Invention
The invention aims to overcome at least one defect in the prior art, and provides a filter which is simple to assemble and produce and convenient for forming symmetrical zero points, so that the inhibition capability of the filter is improved on the premise of not adding any parts.
The technical scheme of the invention is realized as follows: the invention discloses a filter, which comprises a cavity and a cover plate, wherein at least two adjacent dielectric dual-mode resonant cavities are arranged in the cavity, a coupling window is arranged between the two adjacent dielectric dual-mode resonant cavities, dielectric resonators are arranged in the dielectric dual-mode resonant cavities, the side wall of each dielectric resonator is provided with a coupling regulating missing part or coupling regulating protruding part for changing coupling between the dual modes, the coupling regulating missing part or coupling regulating protruding part of one dielectric resonator in the two adjacent dielectric dual-mode resonant cavities is positioned at the left and right directions, and the coupling regulating missing part or coupling regulating protruding part of the other dielectric resonator is positioned at the front and rear directions.
Further, at least one metal cavity is further arranged in the cavity, a metal resonant rod is arranged in the metal cavity, and a coupling window is arranged between the adjacent metal cavity and the dielectric dual-mode resonant cavity.
Further, a first coupling rib is arranged between the adjacent metal cavity and the dielectric dual-mode resonant cavity.
Further, a dielectric resonant cavity is further arranged in the cavity, and a coupling window is arranged between the adjacent dielectric resonant cavity and the dielectric dual-mode resonant cavity.
Further, a second coupling rib is arranged between two adjacent dielectric dual-mode resonant cavities.
Further, the upper end face of the dielectric resonator is in contact with the cover plate, and the lower end face of the dielectric resonator is in contact with the cavity.
Further, the dielectric resonator side wall is provided with a first tuning protrusion or a first tuning missing part for changing the resonance frequency of the first resonance mode thereof and a second tuning protrusion or a second tuning missing part for changing the resonance frequency of the second resonance mode thereof.
Further, a plane rectangular coordinate system is established by taking a straight line passing through the center of the dielectric resonator in the horizontal direction as an X axis, the first frequency modulation protruding part or the first frequency modulation missing part is positioned in the first quadrant or/and the third quadrant, the second frequency modulation protruding part or the second frequency modulation missing part is positioned in the second quadrant or/and the fourth quadrant, the coupling adjusting missing part or the coupling adjusting protruding part on one dielectric resonator in two adjacent dielectric dual-mode resonators is positioned on the X axis, and the coupling adjusting missing part or the coupling adjusting protruding part on the other dielectric resonator is positioned on the Y axis.
Further, a first frequency modulation screw rod used for changing the resonance frequency of a first resonance mode is arranged at the side edge of the dielectric resonator, and a second frequency modulation screw rod used for changing the resonance frequency of a second resonance mode is arranged at the side edge of the dielectric resonator; the first frequency modulation screw rod and the second frequency modulation screw rod are vertically arranged in the cavity and fixed on the cover plate; the cavity is internally provided with a coupling adjusting screw rod for changing coupling between the double modes, and the coupling adjusting screw rod is vertically arranged on the side edge of the dielectric resonator and fixed on the cover plate.
Further, a plane rectangular coordinate system is established by taking a straight line passing through the center of the dielectric resonator in a horizontal direction as an X axis, a first frequency modulation screw rod positioned at the side edge of the dielectric resonator is positioned in a first quadrant or/and a third quadrant, a second frequency modulation screw rod positioned at the side edge of the dielectric resonator is positioned in a second quadrant or/and a fourth quadrant, and a coupling adjustment screw rod positioned at the side edge of the dielectric resonator is positioned on the X axis or the Y axis
The invention has at least the following beneficial effects: the filter is internally provided with two adjacent dielectric dual-mode resonant cavities, the side wall of each dielectric resonator is provided with a coupling regulating missing part or coupling regulating protruding part for changing coupling between the two modes, the coupling regulating missing part or coupling regulating protruding part of one dielectric resonator in the two adjacent dielectric dual-mode resonant cavities is positioned in a left-right direction, the coupling regulating missing part or coupling regulating protruding part of the other dielectric resonator is positioned in a front-back direction, namely the coupling regulating missing part or coupling regulating protruding part of one dielectric resonator is positioned on an X axis, and the coupling regulating missing part or coupling regulating protruding part of the other dielectric resonator is positioned on a Y axis, so that the filter can form symmetrical zero points, and the inhibition capability of the filter is improved on the premise of not increasing any parts.
When the dielectric resonator is rectangular, the invention can effectively change the resonant frequency at the edge increasing part (frequency reducing) or the edge missing part (frequency increasing) of the dielectric resonator. If the dielectric resonator is rectangular, the resonant frequency can be effectively changed by adding the screw at the corresponding edge beside the dielectric resonator.
When the dielectric resonator is rectangular, the invention adds or deletes the part on the surface of the dielectric resonator, which can effectively change the coupling between the double modes. If the dielectric resonator is rectangular, the screw rod is added at the side wall of the dielectric resonator beside the dielectric resonator, which corresponds to the dielectric resonator, so that the coupling between the two modes can be effectively changed.
Other forms of fundamental mode dual mode always have a frequency adjusting screw rod to be adjusted at the side of the cavity, and in consideration of the limitation of application scenes, if the screw rod is placed on the cover plate, the adjusting amount is small. The upper surface and the lower surface of the dielectric resonator are contacted with the cavity to form a high-order double mode, and the assembly and the production are simple. And because of the reason of high-order bimodulus, the frequency coupling screw rod on the apron can both realize great regulating quantity, more is fit for production.
And a first coupling rib is arranged between the adjacent metal cavity and the dielectric dual-mode resonant cavity and used for increasing the coupling strength of the metal cavity and the dielectric dual-mode resonant cavity.
And a second coupling rib is arranged between two adjacent dielectric dual-mode resonant cavities and used for increasing the coupling strength of the two adjacent dielectric dual-mode resonant cavities.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram (not shown) of a filter according to a first embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along A-A of FIG. 1;
fig. 3 is a schematic view of a filter (not shown as a cover plate) according to a first embodiment of the present invention;
fig. 4 is a schematic view of a filter (not shown as a cover plate) according to a second embodiment of the present invention;
fig. 5 is a schematic view (not shown) of a third embodiment of a filter according to the present invention;
fig. 6 is a schematic view of a filter (not shown) according to a fourth embodiment of the present invention;
fig. 7 is a schematic view (not shown) of a filter according to a fifth embodiment of the present invention;
fig. 8 is a schematic view of a filter (not shown) according to a sixth embodiment of the present invention;
fig. 9 is a schematic diagram (not shown) of a filter according to a seventh embodiment of the present invention.
In the drawing, 1 is a cavity, 11 is a dielectric dual-mode resonant cavity, 12 is a metal cavity, 13 is a cavity rib, 14 is a first window, 15 is a second window, 16 is a third window, 2 is a dielectric resonator, 21 is a first frequency modulation missing part, 22 is a second frequency modulation missing part, 23 is a frequency modulation coupling missing part, 3 is a metal resonant rod, 4 is a first coupling rib, 5 is a second coupling rib, 6 is a first frequency modulation screw, 7 is a second frequency modulation screw, and 8 is a frequency modulation coupling screw.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second" may include one or more such features, either explicitly or implicitly; in the description of the present invention, unless otherwise indicated, the meaning of "a plurality", "a number" or "a plurality" is two or more.
Referring to fig. 1 to 9, an embodiment of the present invention provides a filter, including a cavity 1, a cover plate disposed on the cavity 1, and an input port and an output port connected to the cavity 1, where at least two adjacent dielectric dual-mode resonant cavities are disposed in the cavity, a second coupling window is disposed between the two adjacent dielectric dual-mode resonant cavities, a dielectric resonator is disposed in the dielectric dual-mode resonant cavity, a coupling-adjusting missing portion or a coupling-adjusting protruding portion for changing coupling between the dual modes is disposed on a side wall of the dielectric resonator, the coupling-adjusting missing portion or the coupling-adjusting protruding portion of one dielectric resonator of the two adjacent dielectric dual-mode resonant cavities is located in a left-right direction, and the coupling-adjusting missing portion or the coupling-adjusting protruding portion of the other dielectric resonator is located in a front-rear direction.
Further, the upper end face of the dielectric resonator is contacted with the cover plate, and the lower end face of the dielectric resonator is contacted with the cavity to form a high-order dual mode. The dielectric resonator is a cylindrical dielectric resonator.
The dielectric resonator 2 is limited in the cavity 1 by a limiting structure. The limit structure has a plurality of schemes, such as the bottom wall of the cavity 1 is provided with a limit protrusion, the lower end face of the dielectric resonator 2 is provided with a limit groove, the limit protrusion of the bottom wall of the cavity 1 is matched in the limit groove of the lower end face of the dielectric resonator 2 to limit the dielectric resonator 2, and a spacing is arranged between the upper end face of the limit protrusion of the bottom wall of the cavity 1 and the groove bottom of the limit groove. Of course, a limit boss can be arranged on the bottom wall of the cavity 1 around the dielectric resonator 2.
The dielectric resonator 2 may be rectangular (precisely, a rectangular parallelepiped structure), cylindrical, or the like. Preferably, the dielectric resonator 2 is arranged in a rectangular shape.
Further, the dielectric resonator side wall is provided with a first tuning protrusion or first tuning missing part 21 for changing the resonance frequency of the first resonance mode thereof and a second tuning protrusion or second tuning missing part 22 for changing the resonance frequency of the second resonance mode thereof; the side wall of the dielectric resonator is provided with a tuning coupling missing part 23 or a tuning coupling protruding part for changing the coupling between the dual modes, or the inside or the end surface of the dielectric resonator is provided with a second tuning coupling missing part for changing the coupling between the dual modes.
Further, a plane rectangular coordinate system is established by taking a straight line passing through the center of the dielectric resonator in a horizontal direction as an X-axis, a first tuning protrusion or a first tuning missing part 21 is disposed on the side wall of the dielectric resonator corresponding to the first quadrant or/and the third quadrant (i.e., the first tuning protrusion or the first tuning missing part 21 is disposed on the first quadrant or/and the third quadrant), a second tuning protrusion or a second tuning missing part 22 is disposed on the side wall of the dielectric resonator corresponding to the second quadrant or/and the fourth quadrant (i.e., the second tuning protrusion or the second tuning missing part 22 is disposed on the second quadrant or/and the fourth quadrant), and a tuning coupling missing part 23 or a tuning coupling protrusion is disposed on the X-axis or the Y-axis.
When the frequency is tuned, the larger the first tuning missing part 21 and the second tuning missing part 22 are missing, the higher the frequency is, whereas the larger the first tuning protruding part and the second tuning protruding part are protruding, the lower the frequency is.
In the tuning coupling, the larger the tuning coupling missing part 23 and the second tuning coupling missing part are, the stronger the coupling is.
The larger the protrusion of the coupling protrusion part is, the stronger the coupling is.
As a preferred solution, when the first bulge or the first missing part 21 is disposed on the side wall of the dielectric resonator corresponding to the first quadrant and the third quadrant, the first bulge or the first missing part 21 is symmetrical to the first bulge or the first missing part 21 in the third quadrant about the origin, which is not limited to the above symmetrical solution.
Preferably, when the second bulge or the second missing part 22 is disposed on the side wall of the dielectric resonator corresponding to the second quadrant and the fourth quadrant, the second bulge or the second missing part 22 is symmetrical to the second bulge or the second missing part 22 in the fourth quadrant about the origin, which is not limited to the above symmetrical scheme.
Preferably, an acute included angle between the line between the middle position of the first bulge or the first bulge 21 and the origin and the X axis is alpha. The acute angle between the line between the middle position of the second frequency modulation protruding part or the second frequency modulation missing part 22 and the origin and the X axis is beta. α is equal to β, although, of course, it is not limited to the α equal to β scheme.
Preferably, the included angle between the line between the middle position of the first bulge or the line between the middle position and the origin and the acute angle of the X axis is 45 degrees, which is not limited to 45 degrees.
The acute angle between the line between the middle position of the second bump or the second missing bump 22 and the origin and the X axis is 45 degrees, which is not limited to 45 degrees.
As a preferred scheme, a first frequency modulation screw rod 6 for changing the resonance frequency of a first resonance mode is arranged at the side edge of the dielectric resonator, and a second frequency modulation screw rod 7 for changing the resonance frequency of a second resonance mode is arranged at the side edge of the dielectric resonator; the first frequency modulation screw rod 6 and the second frequency modulation screw rod 7 are vertically arranged in the cavity; the cavity is internally provided with a coupling adjusting screw rod 8 for changing coupling between the double modes, and the coupling adjusting screw rod 8 is vertically arranged in a second coupling adjusting missing part at the side edge of the dielectric resonator or at the end surface of the dielectric resonator.
The first frequency modulation screw rod 6 and the second frequency modulation screw rod 7 are fixed on the cover plate. The adjustable coupling screw 8 is fixed on the cover plate.
Further, a plane rectangular coordinate system is established by taking a straight line passing through the center of the dielectric resonator in a horizontal direction as an X axis, a first frequency modulation screw 6 is arranged on the side edge of the dielectric resonator corresponding to the first quadrant or/and the third quadrant (namely, the first frequency modulation screw 6 on the side edge of the dielectric resonator is arranged on the first quadrant or/and the third quadrant), a second frequency modulation screw 7 is arranged on the side edge of the dielectric resonator corresponding to the second quadrant or/and the fourth quadrant (namely, the second frequency modulation screw 7 on the side edge of the dielectric resonator is arranged on the second quadrant or/and the fourth quadrant), and a frequency modulation coupling screw 8 on the side edge of the dielectric resonator is arranged on the X axis or the Y axis.
When the same quadrant is provided with the frequency modulation screw rod and the frequency modulation protruding part or the frequency modulation missing part, the frequency modulation screw rod in the same quadrant is correspondingly close to the frequency modulation protruding part or the frequency modulation missing part.
As a preferred solution, when the first fm screws are disposed on the side walls of the dielectric resonator corresponding to the first quadrant and the third quadrant, the first fm screws in the first quadrant and the first fm screws in the third quadrant are symmetrical about the origin, which is not limited to the above symmetrical solution.
As a preferred solution, when the second fm screws are disposed on the side walls of the dielectric resonator corresponding to the second quadrant and the fourth quadrant, the second fm screws in the second quadrant and the second fm screws in the fourth quadrant are symmetrical about the origin, which is not limited to the above symmetrical solution.
As a preferable scheme, an acute angle included angle between a connecting line between the center of the first frequency modulation screw and the origin and the X axis is alpha. The acute angle included angle between the connecting line between the middle position of the second frequency modulation screw and the origin and the X axis is beta. α is equal to β, although, of course, it is not limited to the α equal to β scheme.
Preferably, the acute angle included between the connecting line between the center of the first fm screw and the origin and the X axis is 45 degrees, which is not limited to 45 degrees.
Preferably, the acute angle included between the connecting line between the center of the second fm screw and the origin and the X axis is 45 degrees, which is not limited to 45 degrees.
Further, when the dielectric resonator 2 is rectangular, the invention can effectively change the resonant frequency by arranging the frequency modulation screw and the adding or deleting part corresponding to the edge of the dielectric resonator. According to the invention, the coupling adjusting screw and the adding or deleting part are arranged on the side surface of the corresponding dielectric resonator, so that the coupling between the dual modes can be effectively changed. Of course, the missing portion can be provided inside the medium.
Further, when the dielectric resonator 2 is rectangular, the first bulge or first missing part 21 is located at an edge of the dielectric resonator 2, and is located on a diagonal line of the rectangle. The second bulge or second missing part 22 is located at the edge of the dielectric resonator 2 on the other diagonal of the rectangle.
The first and second missing portions 21, 22 are preferably cut surfaces at the edges of the dielectric resonator 2 (the edges of the dielectric resonator 2 are cut to form the cut surfaces). The first frequency modulation protruding part and the second frequency modulation protruding part correspond to edges of the wrapping dielectric resonator 2.
When the dielectric resonator 2 is cylindrical, the first missing portion 21 and the second missing portion 22 are preferably grooves on the side wall of the dielectric resonator 2.
The cutting surface and the groove extend in the height direction (i.e., the length direction) of the dielectric resonator 2, and preferably extend in a columnar shape through the upper end face and/or the lower end face of the dielectric resonator 2, but may not extend through the upper end face and/or the lower end face of the dielectric resonator 2.
When the dielectric resonator 2 is rectangular, the coupling-adjusting missing portion 23 or the coupling-adjusting protruding portion is located on the first side wall or/and the second side wall of the dielectric resonator 2. The first side wall is parallel to the second side wall. Preferably, the coupling-adjusting missing portion 23 or the coupling-adjusting protruding portion is located at a middle position of the side wall of the dielectric resonator 2 in the dielectric resonator 2.
Further, when the dielectric resonator 2 is rectangular, the first tuning screw 6 is located on a diagonal line of the rectangle at the edge of the dielectric resonator 2. The second tuning screw 7 is located on the other diagonal of the rectangle at the edge of the dielectric resonator 2.
When the dielectric resonator 2 is rectangular, the tuning coupling screw 8 corresponds to one of the sidewalls of the dielectric resonator 2. Preferably, the coupling screw 8 is located at an intermediate position of the side wall of the dielectric resonator 2 corresponding to the dielectric resonator 2.
Further, when the dielectric resonator 2 is rectangular or cylindrical, the coupling-adjusting missing portions 23 are grooves.
The grooves extend in the height direction (i.e., length direction) of the dielectric resonator 2, and preferably extend in a columnar shape through the upper end face or/and the lower end face of the dielectric resonator 2, but may not extend through the upper end face or/and the lower end face of the dielectric resonator 2.
The second coupling loss portion provided at one end face of the dielectric resonator 2 may or may not penetrate the other end face of the dielectric resonator 2. Preferably, when the second coupling-loss portion is provided at the end face of the dielectric resonator 2, the second coupling-loss portion penetrates the dielectric resonator 2 up and down to form the hollow dielectric resonator 2. Preferably, the second coupling loss is located in the center of the dielectric resonator 2.
The dielectric resonators are provided with a coupling missing part or a coupling protruding part corresponding to the positive direction or/and the negative direction of the X axis, or the dielectric resonators are provided with a coupling missing part or a coupling protruding part corresponding to the positive direction or/and the negative direction of the Y axis.
According to the invention, two adjacent dielectric resonators are arranged in the filter, the coupling-adjusting missing part or the coupling-adjusting protruding part on one dielectric resonator is positioned on the X axis, and the coupling-adjusting missing part or the coupling-adjusting protruding part on the other dielectric resonator is positioned on the Y axis, so that the filter can form a symmetrical zero point, and the inhibition capability of the filter is improved on the premise of not adding any part.
Further, at least one metal cavity is further arranged in the cavity, a metal resonant rod is arranged in the metal cavity, and a first coupling window is arranged between the adjacent metal cavity and the dielectric dual-mode resonant cavity.
Further, a first coupling rib 4 is arranged between the adjacent metal cavity and the dielectric dual-mode resonant cavity. One end of the first coupling rib 4 is connected with the metal resonant rod 3 in the metal cavity 12, and the other end of the first coupling rib 4 extends to a first window 14 between the two cavities or in the dielectric dual-mode resonant cavity. The other end of the first coupling rib 4 extends into the dielectric dual-mode resonant cavity and is connected with the cavity wall (the side wall, the bottom wall and the like of the cavity body 1) or extends into a first window 14 between the two cavities and is connected with the cavity rib 13. The coupling strength of the metal cavity 12 and the dielectric dual-mode resonant cavity is increased by arranging a first window 14 on one side and increasing the coupling strength of the metal cavity 12 and the dielectric high-order dual-mode resonant cavity by the first coupling rib 4. The first coupling rib 4 is a metal coupling rib, such as a metal sheet or a metal block or a metal rod.
Further, at least one metal cavity is arranged at the head end and the tail end of the cavity along the signal transmission direction, and when two adjacent metal cavities are arranged in the cavity, a third coupling window is arranged between the two adjacent metal cavities.
Further, a second coupling rib 5 is arranged between two adjacent dielectric dual-mode resonant cavities 11. The second coupling rib 5 of the present embodiment is a metal coupling rib, such as a metal sheet or metal block or a metal rod.
One end of the second coupling rib 5 is located in one dielectric dual-mode resonant cavity of the two dielectric dual-mode resonant cavities 11 and is connected with the cavity wall of the first dielectric dual-mode resonant cavity, and the other end of the second coupling rib 5 penetrates through a second window 15 between the two cavities and stretches into the other dielectric dual-mode resonant cavity of the two dielectric dual-mode resonant cavities to be connected with the cavity wall of the dielectric dual-mode resonant cavity.
Further, the metal resonant rod 3 is located at the center of the metal cavity 12, and the dielectric resonator 2 is located at the center of the dielectric dual-mode resonant cavity. A first window 14 between adjacent metal cavities 12 and dielectric dual mode resonator cavities and a second window 15 between adjacent two dielectric dual mode resonator cavities are located on one side of the cavity 1.
When the dielectric resonator 2 in the dielectric dual-mode resonant cavity is rectangular, the first window 14 between the adjacent metal cavity 12 and the dielectric dual-mode resonant cavity and the second window 15 between the adjacent two dielectric dual-mode resonant cavities correspond to edges of the dielectric resonator 2.
When the dielectric dual-mode resonant cavity is not the dielectric dual-mode resonant cavity at the head end or the tail end, the dielectric dual-mode resonant cavity is provided with two coupling windows, one coupling window is positioned in a first quadrant or a third quadrant and is correspondingly arranged with the first frequency modulation protruding part or the first frequency modulation missing part or the first frequency modulation screw rod, and the other coupling window is positioned in a second quadrant or a fourth quadrant and is correspondingly arranged with the second frequency modulation protruding part or the second frequency modulation missing part or the second frequency modulation screw rod.
When the dielectric dual-mode resonant cavity is positioned at the head end, the dielectric dual-mode resonant cavity is provided with a coupling window, one of the coupling window and the input port is positioned in a first quadrant or a third quadrant corresponding to the dielectric dual-mode resonant cavity, and the other of the coupling window and the input port is positioned in a second quadrant or a fourth quadrant corresponding to the dielectric dual-mode resonant cavity.
When the dielectric dual-mode resonant cavity is positioned at the tail end, the dielectric dual-mode resonant cavity is provided with a coupling window, one of the coupling window and the output port is positioned in a first quadrant or a third quadrant corresponding to the dielectric dual-mode resonant cavity, and the other of the coupling window and the output port is positioned in a second quadrant or a fourth quadrant corresponding to the dielectric dual-mode resonant cavity.
Further, a dielectric resonant cavity is further arranged in the cavity, and a coupling window is arranged between the adjacent dielectric resonant cavity and the dielectric dual-mode resonant cavity. Corresponding dielectric resonance rods are arranged in the dielectric resonance cavities according to the requirements.
As an embodiment, be equipped with first metal chamber, first medium bimodulus resonant cavity, second metal chamber in the cavity along signal transmission direction in proper order, set up the metal resonance pole in first metal chamber, the second metal intracavity, set up the dielectric resonator in first medium bimodulus resonant cavity, the second medium bimodulus resonant cavity, set up the window respectively between first metal chamber and the first medium bimodulus resonant cavity and between first medium bimodulus resonant cavity and the second medium bimodulus resonant cavity and between second medium bimodulus resonant cavity and the second metal chamber.
Further, referring to fig. 6 to 9, the first metal cavity, the first dielectric dual-mode resonant cavity, the second dielectric dual-mode resonant cavity, and the second metal cavity are arranged in the filter along a straight line, or the first metal cavity, the first dielectric dual-mode resonant cavity, the second dielectric dual-mode resonant cavity, and the second metal cavity are distributed in a field shape in the filter, or the first metal cavity, the first dielectric dual-mode resonant cavity, the second dielectric dual-mode resonant cavity, and the second metal cavity are distributed in a zigzag shape in the filter, and the like.
When the first metal cavity, the first medium dual-mode resonant cavity, the second medium dual-mode resonant cavity and the second metal cavity are distributed in the filter in a Z shape, the first metal cavity, the first medium dual-mode resonant cavity, the second medium dual-mode resonant cavity and the second metal cavity are arranged in two rows, the first metal cavity and the first medium dual-mode resonant cavity are arranged in the first row side by side along the horizontal direction, the first metal cavity is positioned on the left side of the first medium dual-mode resonant cavity, the second medium dual-mode resonant cavity and the second metal cavity are arranged in the second row side by side along the horizontal direction, the second medium dual-mode resonant cavity is positioned on the left side of the second metal cavity, and a coupling window is formed between the first medium dual-mode resonant cavity and the second medium dual-mode resonant cavity.
As another embodiment, a third metal cavity is arranged between the first metal cavity and the input port in the cavity, a fourth metal cavity is arranged between the second metal cavity and the output port in the cavity, and metal resonant rods are arranged in the third metal cavity and the fourth metal cavity. A third window 16 is provided between the first and third metal cavities and between the second and fourth metal cavities. The third window 16 is located at an intermediate position of the chamber 1 in the width direction.
The upper end surface and the lower end surface of the cylindrical dielectric resonator are contacted with the cavity to form a high-order dual mode, the installation mode is similar to that of a traditional TM mode cylinder resonant structure, and the assembly production is simple.
Other forms of fundamental mode dual mode always have a frequency modulation screw to be adjusted at the side, and considering the limitation of application scene, if the screw is put on the cover plate, the adjustment amount is small. The invention can realize larger adjustment quantity of the frequency modulation screw on the cover plate due to high-order double modes, and is more suitable for production.
According to the invention, the coupling directions of the dielectric resonators are orthogonal, so that the filter forms a symmetrical zero point, and the inhibition capability of the filter is improved on the premise of not adding any part.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. The utility model provides a wave filter, includes cavity, apron, its characterized in that: the dielectric resonator is characterized in that at least two adjacent dielectric dual-mode resonant cavities are arranged in the cavity, a coupling window is arranged between the two adjacent dielectric dual-mode resonant cavities, dielectric resonators are arranged in the dielectric dual-mode resonant cavities, a coupling regulating missing part or a coupling regulating protruding part for changing coupling between the dual modes is arranged on the side wall of each dielectric resonator, the coupling regulating missing part or the coupling regulating protruding part of one dielectric resonator in the two adjacent dielectric dual-mode resonant cavities is positioned at the left and right directions, and the coupling regulating missing part or the coupling regulating protruding part of the other dielectric resonator is positioned at the front and rear directions.
2. The filter of claim 1, wherein: at least one metal cavity is further arranged in the cavity, a metal resonant rod is arranged in the metal cavity, and a coupling window is arranged between the adjacent metal cavity and the dielectric dual-mode resonant cavity.
3. The filter of claim 2, wherein: a first coupling rib is arranged between the adjacent metal cavity and the dielectric dual-mode resonant cavity.
4. The filter of claim 1, wherein: a dielectric resonant cavity is further arranged in the cavity, and a coupling window is arranged between the adjacent dielectric resonant cavity and the dielectric dual-mode resonant cavity.
5. The filter of claim 1, wherein: and a second coupling rib is arranged between two adjacent dielectric dual-mode resonant cavities.
6. The filter of claim 1, wherein: the upper end face of the dielectric resonator is contacted with the cover plate, and the lower end face of the dielectric resonator is contacted with the cavity.
7. The filter of claim 1, wherein: the dielectric resonator side wall is provided with a first frequency modulation protruding part or a first frequency modulation missing part for changing the resonance frequency of a first resonance mode of the dielectric resonator and a second frequency modulation protruding part or a second frequency modulation missing part for changing the resonance frequency of a second resonance mode of the dielectric resonator.
8. The filter of claim 7, wherein: a straight line passing through the center of the dielectric resonator in a horizontal direction is taken as an X axis to establish a plane rectangular coordinate system, a first frequency modulation protruding part or a first frequency modulation missing part is positioned in a first quadrant or/and a third quadrant, a second frequency modulation protruding part or a second frequency modulation missing part is positioned in a second quadrant or/and a fourth quadrant, a coupling adjusting missing part or a coupling adjusting protruding part on one dielectric resonator in two adjacent dielectric dual-mode resonators is positioned on the X axis, and a coupling adjusting missing part or a coupling adjusting protruding part on the other dielectric resonator is positioned on the Y axis.
9. The filter of claim 1, wherein: the side edge of the dielectric resonator is provided with a first frequency modulation screw rod used for changing the resonance frequency of a first resonance mode of the dielectric resonator, and the side edge of the dielectric resonator is provided with a second frequency modulation screw rod used for changing the resonance frequency of a second resonance mode of the dielectric resonator; the first frequency modulation screw rod and the second frequency modulation screw rod are vertically arranged in the cavity and fixed on the cover plate; the cavity is internally provided with a coupling adjusting screw rod for changing coupling between the double modes, and the coupling adjusting screw rod is vertically arranged on the side edge of the dielectric resonator and fixed on the cover plate.
10. The filter of claim 9, wherein: a straight line passing through the center of the dielectric resonator in a horizontal direction is taken as an X axis to establish a plane rectangular coordinate system, a first frequency modulation screw rod positioned at the side edge of the dielectric resonator is positioned in a first quadrant or/and a third quadrant, a second frequency modulation screw rod positioned at the side edge of the dielectric resonator is positioned in a second quadrant or/and a fourth quadrant, and a coupling adjustment screw rod positioned at the side edge of the dielectric resonator is positioned on the X axis or the Y axis.
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