CN212434807U - Dielectric waveguide filter - Google Patents
Dielectric waveguide filter Download PDFInfo
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- CN212434807U CN212434807U CN202021667763.9U CN202021667763U CN212434807U CN 212434807 U CN212434807 U CN 212434807U CN 202021667763 U CN202021667763 U CN 202021667763U CN 212434807 U CN212434807 U CN 212434807U
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Abstract
The utility model relates to a dielectric waveguide filter, on the one hand, the length of negative coupling window is greater than 1/2 of the thickness of first dielectric block and second dielectric block, and the length of negative coupling window all is not less than 1/4 wavelength of the operating frequency of dielectric waveguide filter, when using this application's a dielectric waveguide filter in the electronic product, realize the negative coupling through negative coupling window between the resonant cavity on first dielectric block and the resonant cavity on the second dielectric block, and combine positive coupling window, make dielectric waveguide filter produce two transmission zeros, improve outband rejection ability; on the other hand, firstly, a negative coupling window and a positive coupling window are arranged on the mutually connected outer wall surfaces of the first dielectric block and the second dielectric block, and then the first dielectric block and the second dielectric block are connected through the metal layer on the outer wall surfaces, so that the manufacturing efficiency is improved, and the method is suitable for batch production.
Description
Technical Field
The utility model discloses communication technology relates to the field, in particular to dielectric waveguide filter.
Background
With the increasing demand of the 5G communication system on the miniaturization of the base station device, the dielectric waveguide filter becomes a mainstream application scheme for replacing the traditional cavity filter in the future due to the advantages of small volume, small insertion loss, large bearing power, low cost and the like, when the dielectric waveguide filter commonly used in the industry at present is a single-layer structure scheme, namely, each coupling window is manufactured in the whole dielectric block, the dielectric waveguide filter manufactured by the scheme has the defect of poor out-of-band rejection capability, and the manufacturing efficiency is low, so that the manufacturing is not beneficial to batch production.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to prior art not enough, provide a dielectric waveguide filter.
The utility model discloses a dielectric waveguide filter's technical scheme as follows:
the resonant cavity structure comprises a first dielectric block and a second dielectric block which are connected with each other through outer wall surfaces, wherein at least two resonant cavities which are sequentially coupled are formed on the first dielectric block, at least two resonant cavities which are sequentially coupled are formed on the second dielectric block, and metal layers are covered on the outer wall surfaces of the first dielectric block and the second dielectric block;
the outer wall surfaces connected with each other are provided with a negative coupling window which enables the resonant cavity of the first dielectric block and the resonant cavity of the second dielectric block to form negative coupling, and are provided with a positive coupling window which enables the resonant cavity of the first dielectric block and the resonant cavity of the second dielectric block to form positive coupling;
the length of the negative coupling window is greater than 1/2 of the thickness of the first dielectric block and the second dielectric block, and the length of the negative coupling window is not less than 1/4 wavelengths of the working frequency of the dielectric waveguide filter.
The utility model discloses a dielectric waveguide filter's beneficial effect as follows:
on one hand, the length of the negative coupling window is greater than 1/2 of the thickness of the first dielectric block and the second dielectric block, and the length of the negative coupling window is not less than 1/4 of the working frequency of the dielectric waveguide filter, when the dielectric waveguide filter is applied to an electronic product, the negative coupling is realized between the resonant cavity on the first dielectric block and the resonant cavity on the second dielectric block through the negative coupling window, and the two transmission zeros are generated by the dielectric waveguide filter by combining with the positive coupling window, so that the out-of-band rejection capability is improved; on the other hand, firstly, a negative coupling window and a positive coupling window are arranged on the mutually connected outer wall surfaces of the first dielectric block and the second dielectric block, and then the first dielectric block and the second dielectric block are connected through the metal layer on the outer wall surfaces, so that the manufacturing efficiency is improved, and the method is suitable for batch production.
On the basis of the above technical solution, the utility model discloses a dielectric waveguide filter can also do following improvement.
Further, the negative coupling window comprises a first negative coupling window (51) disposed on the first dielectric block (11) and a second negative coupling window (52) disposed on the second dielectric block (12), and the first negative coupling window (51) and the second negative coupling window (52) are mirror images of each other.
Further, the positive coupling window comprises a first positive coupling window (61) arranged on the first dielectric block (11) and a second positive coupling window (62) arranged on the second dielectric block (12), and the first positive coupling window (61) and the second positive coupling window (61) are mirror images of each other.
Furthermore, the first negative coupling window and the second negative coupling window are both in a concave shape, the positions, close to the bottom, of two side edges of the concave shape are concave to form inner notches, and the two inner notches are communicated with the concave parts of the concave shape.
The beneficial effect of adopting the further scheme is that: the first negative coupling window and the second negative coupling window are simple in structure, manufacturing efficiency is further improved, and the method is suitable for batch production.
Further, with the top surface of the inner recess as an initial position, removing a metal layer in a preset shape in the inner recess to change the coupling amount between the resonant cavity on the first dielectric block corresponding to the first negative coupling window and the resonant cavity on the second dielectric block corresponding to the second negative coupling window.
The beneficial effect of adopting the further scheme is that: when the coupling quantity between the resonant cavity on the first dielectric block corresponding to the first negative coupling window and the resonant cavity on the second dielectric block corresponding to the second negative coupling window needs to be changed, only the metal layer with the preset shape needs to be removed from the inner notch, the height and the width of the concave shapes of the first negative coupling window and the second negative coupling window cannot be enlarged, and the structure of the metal layer is more compact.
Further, a first resonant cavity and a second resonant cavity which are sequentially coupled are formed on the first dielectric block, and a third resonant cavity and a fourth resonant cavity which are sequentially coupled are formed on the second dielectric block;
the first negative coupling window is positioned on the outer surface of the first resonant cavity, the second negative coupling window is positioned on the outer surface of the third resonant cavity, and the first negative coupling window and the second negative coupling window are used for coupling the first resonant cavity and the third resonant cavity;
the first positive coupling window is located on the outer surface of the second resonant cavity, the second positive coupling window is located on the outer surface of the fourth resonant cavity, and the first positive coupling window and the second positive coupling window are used for coupling the second resonant cavity and the fourth resonant cavity.
Further, the first dielectric block further forms a fifth resonant cavity coupled to the second resonant cavity, and the second dielectric block further forms a sixth resonant cavity coupled to the fourth resonant cavity;
the first medium block is also provided with a first input/output coupling blind hole, and the first input/output coupling blind hole is positioned on the outer surface of the fifth resonant cavity;
and the second medium block is also provided with a second input/output coupling blind hole, and the second input/output coupling blind hole is positioned on the outer surface of the sixth resonant cavity.
Furthermore, the first resonant cavity, the second resonant cavity, the third resonant cavity, the fourth resonant cavity, the fifth resonant cavity and the sixth resonant cavity are respectively provided with a tuning blind hole.
Further, a coupling blind hole is respectively arranged between the first resonant cavity and the second resonant cavity, between the second resonant cavity and the fifth resonant cavity, between the third resonant cavity and the fourth resonant cavity, and between the fourth resonant cavity and the sixth resonant cavity.
Further, the first positive coupling window and the second positive coupling window are both rectangular or elliptical.
Further, the first dielectric block and the second dielectric block are ceramic dielectric blocks.
Further, the metal layer is a silver-plated metal layer or a copper-plated metal.
Drawings
Fig. 1 is a structural diagram of a dielectric waveguide filter according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a first negative coupling window;
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the description of the embodiments is provided for purposes of illustration only and is not intended to limit the embodiments of the present invention.
As shown in fig. 1, in the dielectric waveguide filter according to the embodiment of the present invention, through a first dielectric block 11 and a second dielectric block 12 whose outer wall surfaces are connected to each other, at least two resonant cavities coupled in sequence are formed on the first dielectric block 11, at least two resonant cavities coupled in sequence are formed on the second dielectric block 12, and a metal layer is coated on both outer wall surfaces of the first dielectric block 11 and the second dielectric block 12;
on the outer wall surfaces connected with each other, a negative coupling window for enabling the resonant cavity of the first dielectric block 11 and the resonant cavity of the second dielectric block 12 to form negative coupling is formed, and a positive coupling window for enabling the resonant cavity of the first dielectric block 11 and the resonant cavity of the second dielectric block 12 to form positive coupling is formed;
the length of the negative coupling window is greater than 1/2 of the thickness of the first dielectric block 11 and the second dielectric block 12, and the length of the negative coupling window is not less than 1/4 wavelength of the working frequency of the dielectric waveguide filter.
On one hand, the length of the negative coupling window is greater than 1/2 of the thickness of the first dielectric block 11 and the second dielectric block 12, and the length of the negative coupling window is not less than 1/4 of the working frequency of the dielectric waveguide filter, when the dielectric waveguide filter is applied to an electronic product, the negative coupling is realized between the resonant cavity on the first dielectric block 11 and the resonant cavity on the second dielectric block 12 through the negative coupling window, and the two transmission zeros are generated by the dielectric waveguide filter by combining the positive coupling window, so that the out-of-band rejection capability is improved; on the other hand, firstly, the mutually connected outer wall surfaces of the first dielectric block 11 and the second dielectric block 12 are provided with a negative coupling window and a positive coupling window, and then the first dielectric block 11 and the second dielectric block 12 are connected through the metal layer of the outer wall surfaces, so that the manufacturing efficiency is improved, and the method is suitable for mass production.
Preferably, in the above technical solution, the negative coupling window includes a first negative coupling window 51 disposed on the first dielectric block 11 and a second negative coupling window 52 disposed on the second dielectric block 12, and the first negative coupling window 51 and the second negative coupling window 52 are mirror images of each other; the positive coupling window includes a first positive coupling window 61 disposed on the first dielectric block 11 and a second positive coupling window 62 disposed on the second dielectric block 12, and the first positive coupling window 61 and the second positive coupling window 61 are mirror images of each other. Specifically, the method comprises the following steps:
the first dielectric block 11 comprises a first outer wall surface, the second dielectric block 12 comprises a second outer wall surface, and the first dielectric block 11 and the second dielectric block 12 are connected through metal layers of the first outer wall surface and the second outer wall surface, namely the mutually connected outer wall surfaces are the first outer wall surface and the second outer wall surface;
the metal layer on the first outer wall surface is provided with a first negative coupling window 51 and a first positive coupling window 61, and the metal layer on the second outer wall surface is provided with a second negative coupling window 52 and a second positive coupling window 62;
the first negative coupling window 51 and the second negative coupling window 52 have the same structure, and the first negative coupling window 51 and the second negative coupling window 52 are disposed opposite to each other, that is, the first negative coupling window (51) and the second negative coupling window (52) are mirror images of each other, and are used for coupling a resonant cavity on the first dielectric block 11 corresponding to the first negative coupling window 51 with a resonant cavity on the second dielectric block 12 corresponding to the second negative coupling window 52;
the first positive coupling window 61 and the second positive coupling window 62 are disposed opposite to each other, and are configured to couple a resonant cavity on the first dielectric block 11 corresponding to the first positive coupling window 61 with a resonant cavity on the second dielectric block 12 corresponding to the second positive coupling window 62;
the length of the first negative coupling window 51 is greater than 1/2 of the thickness of the first dielectric block 11, the length of the second negative coupling window 52 is greater than 1/2 of the thickness of the second dielectric block 12, and the lengths of the first negative coupling window 51 and the second negative coupling window 52 are not less than 1/4 wavelengths of the working frequency of the dielectric waveguide filter.
On one hand, by arranging a first negative coupling window 51 and a second negative coupling window 52 with the same structure, wherein the length of the first negative coupling window 51 is greater than 1/2 of the thickness of the first dielectric block 11, the length of the second negative coupling window 52 is greater than 1/2 of the thickness of the second dielectric block 12, the lengths of the negative coupling window 51 and the second negative coupling window 52 of the first negative coupling window 51 are not less than 1/4 wavelength of the working frequency of the dielectric waveguide filter, negative coupling is realized between the resonant cavity on the first dielectric block 11 corresponding to the first negative coupling window 51 and the resonant cavity on the second dielectric block 12 corresponding to the second negative coupling window 52, and positive coupling, that is, inductive coupling is realized between the resonant cavity on the first dielectric block 11 corresponding to the first positive coupling window 61 and the resonant cavity on the second dielectric block 12 corresponding to the second positive coupling window 62, the dielectric waveguide filter generates two transmission zeros, and the out-of-band rejection capability is improved, on the other hand, firstly, a first negative coupling window 51 and a first positive coupling window 61 are arranged on the first dielectric block 11, a second negative coupling window 52 and a second positive coupling window 62 are arranged on the second dielectric block 12, and then the first dielectric block 11 and the second dielectric block 12 are connected through metal layers of the first outer wall surface and the second outer wall surface, so that the manufacturing efficiency is improved, and the dielectric waveguide filter is suitable for batch production.
The number of sequentially coupled resonant cavities formed on the first dielectric block 11 may be 2, 3, 4, etc., and correspondingly, the number of sequentially coupled resonant cavities formed on the second dielectric block 12 is also 2, 3, 4, etc.;
the first dielectric block 11 and the second dielectric block 12 are connected through the metal layer of the first outer wall surface and the metal layer of the second outer wall surface in a high-temperature sintering mode of printing silver paste, so that the first dielectric block 11 and the second dielectric block 12 are spliced into a complete dielectric waveguide filter, through hole partition between non-adjacent resonant cavity cavities is eliminated, the isolation between the first dielectric block 11 and the second dielectric block 12 and the structural reliability of the dielectric waveguide filter are improved, the yield of the manufactured dielectric waveguide filter is also greatly improved, and a coupling window of photoetching is required to be avoided when the silver paste is printed.
Wherein, it can be understood that, since the length of the first negative coupling window 51 is greater than 1/2 of the thickness of the first dielectric block 11, the length of the second negative coupling window 52 is greater than 1/2 of the thickness of the second dielectric block 12, and the lengths of the negative coupling window 51 and the negative coupling window 52 are not less than 1/4 of the working frequency of the dielectric waveguide filter, negative coupling is realized between the resonant cavity on the first dielectric block 11 corresponding to the first negative coupling window 51 and the resonant cavity on the second dielectric block 12 corresponding to the second negative coupling window 52, so as to form a transmission zero point, and in combination with positive coupling, i.e. inductive coupling, between the resonant cavity on the first dielectric block 11 corresponding to the first positive coupling window 61 and the resonant cavity on the second dielectric block 12 corresponding to the second positive coupling window 62, the dielectric waveguide filter generates two transmission zero points, the out-of-band rejection is further improved, wherein the structures of the first positive coupling window 61 and the second cross-coupling window may be the same or different.
Among these, it is understood that: the first negative coupling window 51, the second negative coupling window 52, the first positive coupling window 61 and the second positive coupling window 62 are formed after the metal layer on the first outer surface wall is removed through technologies such as printing, etching or photoetching, the manufacturing is simple, the first negative coupling window 51, the second negative coupling window 52, the first positive coupling window 61 and the second positive coupling window 62 with high precision can be manufactured more easily than a dry pressure scheme in a single-layer structure scheme, particularly, the precision requirement cannot exceed +/-0.03 mm for the first negative coupling window 51 and the second negative coupling window 52, if the precision is difficult to guarantee through a dry pressure scheme, if the precision is guaranteed through CNC (computer numerical control) engraving secondary processing, but the cost is increased, the precision requirement +/-0.03 mm can be easily realized through printing, etching or photoetching in the application, the manufacturing is simple, and the cost is low.
Preferably, as shown in fig. 2, in the above technical solution, the first negative coupling window 51 and the second negative coupling window 52 are both in a shape of a Chinese character 'ao', and positions of two sides 510 of the Chinese character 'ao' shape near the bottom are recessed to form inner recesses 530, and both of the inner recesses 530 are communicated with the recessed portion 520 of the Chinese character 'ao'.
The first negative coupling window 51 and the second negative coupling window 52 have simple structures, further improve the manufacturing efficiency, and are suitable for mass production, wherein the lengths of the first negative coupling window 51 and the second negative coupling window 52 refer to: the length of the two sides 510 of the glyph is summed with the length of the bottom side 550. It will be appreciated that the length of the first negative coupling window 51 can be understood as: the sum of the lengths of the parts of the first negative coupling window 51, or the length determined according to the gravity center position of the parts, and the process of obtaining the length of the negative coupling window in the dielectric waveguide filter are known in the art and will not be described herein.
Preferably, in the above technical solution, as shown in fig. 2, with the top surface of the inner recess 530 as a starting position, a metal layer, i.e. a removed portion 540, with a preset shape is removed from the inner recess 530, so as to change the magnitude of the negative coupling between the resonant cavity on the first dielectric block 11 corresponding to the first negative coupling window 51 and the resonant cavity on the second dielectric block 12 corresponding to the second negative coupling window 52.
When the coupling amount between the resonant cavity on the first dielectric block 11 corresponding to the first negative coupling window 51 and the resonant cavity on the second dielectric block 12 corresponding to the second negative coupling window 52 needs to be changed, only the metal layer with the preset shape needs to be removed from the inner recess 530, the height and width of the concave shapes of the first negative coupling window 51 and the second negative coupling window 52 are not enlarged, the structure of the resonator is more compact, wherein the preset shape can be a rectangle, a semicircle or the like, and the metal layer can be removed by using an etching process, an engraving process or a polishing process.
Wherein it can be understood that: the metal layer of the predetermined shape, i.e., the removed portion 540, may be removed only in one of the inner recesses 530 of the first negative coupling window 51, and correspondingly, the metal layer of the predetermined shape, i.e., the removed portion 540, may be removed only in one of the inner recesses 530 of the second negative coupling window 52, where the lengths of the first negative coupling window 51 and the second negative coupling window 52 refer to: the sum of the lengths of the two sides 510, the length of the bottom side 550, and the length of one removed portion 540 of the glyph;
a metal layer of a predetermined shape, i.e., the removed portion 540, may be removed in both of the inner recesses 530 of the first negative coupling window 51, and correspondingly, a metal layer of a predetermined shape, i.e., the removed portion 540, may be removed in both of the inner recesses 530 of the second negative coupling window 52, where the lengths of the first negative coupling window 51 and the second negative coupling window 52 refer to: the sum of the lengths of the two sides 510, the length of the bottom side 550, and the lengths of the two removed portions 540 of the glyph.
In the dielectric waveguide filter of the embodiment, the metal layers with preset shapes are removed from the inner notches 530, so that the negative coupling amount between the resonant cavity on the first dielectric block 11 corresponding to the first negative coupling window 51 and the resonant cavity on the second dielectric block 12 corresponding to the second negative coupling window 52 is increased, and the longitudinal size of the etched pattern is shortened, that is, the lengths of the first negative coupling window 51 and the second negative coupling window 52 are shortened, the negative coupling can be realized only when the length of the longitudinally etched pattern, that is, the length of the negative coupling window, is 1/2 wavelengths of the working frequency of the dielectric waveguide filter, and the negative coupling can be realized when the length of the longitudinally etched pattern is smaller than 1/2 wavelengths.
Preferably, in the above technical solution, a first resonant cavity 21 and a second resonant cavity 22 are formed on the first dielectric block 11 and are sequentially coupled, and a third resonant cavity 23 and a fourth resonant cavity 24 are formed on the second dielectric block 12 and are sequentially coupled;
the first negative coupling window 51 is located on the outer surface of the first resonant cavity 21, the second negative coupling window 52 is located on the outer surface of the third resonant cavity 23, and the first negative coupling window 51 and the second negative coupling window 52 are used for coupling the first resonant cavity 21 and the third resonant cavity 23;
the first positive coupling window 61 is located on an outer surface of the second resonant cavity 22, the second positive coupling window 62 is located on an outer surface of the fourth resonant cavity 24, and the first positive coupling window 61 and the second positive coupling window 62 are used for coupling the second resonant cavity 22 and the fourth resonant cavity 24.
Preferably, in the above technical solution, the first dielectric block 11 further forms a fifth resonant cavity 25 coupled to the second resonant cavity 22, and the second dielectric block 12 further forms a sixth resonant cavity 26 coupled to the fourth resonant cavity 24;
a first input/output coupling blind hole 71 is further formed in the first dielectric block 11, and the first input/output coupling blind hole 71 is located on the outer surface of the fifth resonant cavity 25;
a second input/output coupling blind hole 72 is further disposed on the second dielectric block 12, and the second input/output coupling blind hole 72 is located on the outer surface of the sixth resonant cavity 26.
When the first input/output coupling blind via 71 is used as a signal input interface, the corresponding second input/output coupling blind via 72 is used as a signal output interface, and vice versa.
A dielectric waveguide filter according to the present application is described below with reference to a signal transmission path as an example, specifically:
1) the first negative coupling window 51 is located on the outer surface of the first resonant cavity 21, the second negative coupling window 52 is located on the outer surface of the third resonant cavity 23, the first positive coupling window 61 is located on the outer surface of the second resonant cavity 22, and the second positive coupling window 62 is located on the outer surface of the fourth resonant cavity 24, at this time, the resonant cavity of the first dielectric block 11 corresponding to the first negative coupling window 51 is the first resonant cavity 21, the resonant cavity of the second dielectric block 12 corresponding to the second negative coupling window 52 is the third resonant cavity 23, the resonant cavity of the first dielectric block 11 corresponding to the first positive coupling window 61 is the second resonant cavity 22, and the resonant cavity of the second dielectric block 12 corresponding to the second positive coupling window 62 is the fourth resonant cavity 24, then:
the signal transmission path is: the second input/output coupling blind hole 72 → the sixth resonant cavity 26 → the fourth resonant cavity 24 → the third resonant cavity 23 → the first resonant cavity 21 → the second resonant cavity 22 → the fifth resonant cavity 25 → the first input/output coupling blind hole 71, wherein, due to the negative coupling between the second negative coupling window 52 of the third resonant cavity 23 and the first negative coupling window 51 of the first resonant cavity 21, the phase of the electromagnetic wave transmitted from the first negative coupling window 51 to the second negative coupling window 52 is reversed, so as to form a transmission zero point, and due to the positive coupling between the second positive coupling window 62 of the fourth resonant cavity 24 and the first positive coupling window 61 of the third resonant cavity 23, the dielectric waveguide filter generates two transmission zero points, thereby further improving the out-of-band rejection capability.
2) The first negative coupling window 51 may be located on an outer surface of the second resonant cavity 22, the second negative coupling window 52 is located on an outer surface of the fourth resonant cavity 24, the first positive coupling window 61 is located on an outer surface of the first resonant cavity 21, and the second positive coupling window 62 is located on an outer surface of the third resonant cavity 23, at this time, the resonant cavity of the first dielectric block 11 corresponding to the first negative coupling window 51 is the second resonant cavity 22, the resonant cavity of the second dielectric block 12 corresponding to the second negative coupling window 52 is the fourth resonant cavity 24, the resonant cavity of the first dielectric block 11 corresponding to the first positive coupling window 61 is the first resonant cavity 21, and the resonant cavity of the second dielectric block 12 corresponding to the second positive coupling window 62 is the third resonant cavity 23, then:
the signal transmission path is: the second input/output coupling blind hole 72 → the sixth resonant cavity 26 → the fourth resonant cavity 24 → the third resonant cavity 23 → the first resonant cavity 21 → the second resonant cavity 22 → the fifth resonant cavity 25 → the first input/output coupling blind hole 71,
wherein, the second negative coupling window 52 of the fourth resonant cavity 24 and the first negative coupling window 51 of the second resonant cavity 22 are negatively coupled, so that the phase of the electromagnetic wave transmitted from the first negative coupling window 51 to the second negative coupling window 52 is reversed, thereby forming a transmission zero point, and the positive coupling exists between the second positive coupling window 62 of the third resonant cavity 23 and the first positive coupling window 61 of the second resonant cavity 22, so that the dielectric waveguide filter generates two transmission zero points, thereby further improving the out-of-band rejection capability.
Preferably, in the above technical solution, the first resonant cavity 21, the second resonant cavity 22, the third resonant cavity 23, the fourth resonant cavity 24, the fifth resonant cavity 25 and the sixth resonant cavity 26 are respectively provided with a tuning blind hole. Specifically, the method comprises the following steps:
a first tuning blind hole 31 is formed in the first resonant cavity 21, a second tuning blind hole 32 is formed in the second resonant cavity 22, a third tuning blind hole 33 is formed in the third resonant cavity 23, a fourth tuning blind hole 34 is formed in the fourth resonant cavity 24, a fifth tuning blind hole 35 is formed in the fifth resonant cavity 25, and a sixth tuning blind hole 36 is formed in the sixth resonant cavity 26, for example, the first resonant cavity 21 can be tuned by removing a metal layer in the first tuning blind hole 31.
Preferably, in the above technical solution, a coupling blind hole is respectively disposed between the first resonant cavity 21 and the second resonant cavity 22, between the second resonant cavity 22 and the fifth resonant cavity 25, between the third resonant cavity 23 and the fourth resonant cavity 24, and between the fourth resonant cavity 24 and the sixth resonant cavity 26. Specifically, the method comprises the following steps:
a first coupling blind hole 41 is formed in the first dielectric block 11 and located between the first resonant cavity 21 and the second resonant cavity 22, and the first coupling blind hole 41 is used for coupling the first resonant cavity 21 and the second resonant cavity 22;
a third coupling blind hole 43 is arranged on the first dielectric block 11 and between the second resonant cavity 22 and the fifth resonant cavity 25, and the third coupling blind hole 43 is used for coupling the second resonant cavity 22 and the fifth resonant cavity 25;
a second coupling blind hole 42 is formed in the second dielectric block 12 and located between the third resonant cavity 23 and the fourth resonant cavity 24, and the second coupling blind hole 42 is used for coupling the third resonant cavity 23 and the third resonant cavity 23;
a fourth coupling blind hole 44 is disposed on the second dielectric block 12 and between the fourth resonant cavity 24 and the sixth resonant cavity 26, and the fourth coupling blind hole 44 is used for coupling the fourth resonant cavity 24 and the sixth resonant cavity 26.
The size of the coupling blind hole coupling the two resonant cavities is used for controlling the inductive coupling quantity, namely the positive coupling quantity of the two resonant cavities.
Preferably, in the above technical solution, the first positive coupling window 61 and the second positive coupling window 62 are both rectangular or elliptical.
Preferably, in the above technical solution, the first dielectric block 11 and the second dielectric block 12 are ceramic dielectric blocks.
Preferably, in the above technical solution, the metal layer is a silver-plated metal layer or a copper-plated metal layer.
In addition, in order to improve the metallization yield of the metal layer, R or C chamfers need to be arranged on edges of all tuning blind holes, all coupling blind holes, all input/output coupling blind holes, the first dielectric block 11 and the second dielectric block 12, and the chamfer size can be any value, but from the perspective of being suitable for production, the recommended value is 0.1-0.5.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structural changes made by the contents of the specification and the drawings, or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A dielectric waveguide filter, comprising: the resonant cavity structure comprises a first dielectric block (11) and a second dielectric block (12) which are connected with each other through outer wall surfaces, wherein at least two resonant cavities which are sequentially coupled are formed on the first dielectric block (11), at least two resonant cavities which are sequentially coupled are formed on the second dielectric block (12), and metal layers are coated on the outer wall surfaces of the first dielectric block (11) and the second dielectric block (12);
the outer wall surfaces connected with each other are provided with a negative coupling window which enables the resonant cavity of the first dielectric block (11) and the resonant cavity of the second dielectric block (12) to form negative coupling, and provided with a positive coupling window which enables the resonant cavity of the first dielectric block (11) and the resonant cavity of the second dielectric block (12) to form positive coupling;
the length of the negative coupling window is larger than 1/2 of the thickness of the first dielectric block (11) and the second dielectric block (12), and the length of the negative coupling window is not smaller than 1/4 wavelength of the working frequency of the dielectric waveguide filter.
2. A dielectric waveguide filter according to claim 1, wherein the negative coupling windows comprise a first negative coupling window (51) provided in the first dielectric block (11) and a second negative coupling window (52) provided in the second dielectric block (12), and the first negative coupling window (51) and the second negative coupling window (52) are mirror images of each other.
3. A dielectric waveguide filter according to claim 2, wherein the positive coupling windows comprise a first positive coupling window (61) provided in the first dielectric block (11) and a second positive coupling window (62) provided in the second dielectric block (12), and the first positive coupling window (61) and the second positive coupling window (62) are mirror images of each other.
4. A dielectric waveguide filter according to claim 3, wherein the first negative coupling window (51) and the second negative coupling window (52) are each in the shape of a Chinese character 'ao', and both sides (510) of the Chinese character 'ao' are recessed near the bottom to form an inner recess (530), and both inner recesses (530) are in communication with the recess (520) of the Chinese character 'ao'.
5. A dielectric waveguide filter according to claim 4, further comprising:
and with the top surface of the inner notch (530) as a starting position, removing a metal layer with a preset shape in the inner notch (530) to change the magnitude of the negative coupling quantity between the resonant cavity on the first dielectric block (11) corresponding to the first negative coupling window (51) and the resonant cavity on the second dielectric block (12) corresponding to the second negative coupling window (52).
6. A dielectric waveguide filter according to any one of claims 3 to 5 wherein the first dielectric block (11) is formed with a first resonant cavity (21) and a second resonant cavity (22) coupled thereto, and the second dielectric block (12) is formed with a third resonant cavity (23) and a fourth resonant cavity (24) coupled thereto; the first negative coupling window (51) is located at an outer surface of the first resonant cavity (21), and the second negative coupling window (52) is located at an outer surface of the third resonant cavity (23); the first positive coupling window (61) is located at an outer surface of the second resonant cavity (22), and the second positive coupling window (62) is located at an outer surface of the fourth resonant cavity (24).
7. A dielectric waveguide filter according to claim 6 wherein the first dielectric block (11) further forms a fifth resonant cavity (25) coupled to the second resonant cavity (22), and the second dielectric block (12) further forms a sixth resonant cavity (26) coupled to the fourth resonant cavity (24); a first input/output coupling blind hole (71) is further formed in the first dielectric block (11), and the first input/output coupling blind hole (71) is located on the outer surface of the fifth resonant cavity (25); and a second input/output coupling blind hole (72) is further formed in the second medium block (12), and the second input/output coupling blind hole (72) is located on the outer surface of the sixth resonant cavity (26).
8. A dielectric waveguide filter according to claim 7, wherein said first (21), said second (22), said third (23), said fourth (24), said fifth (25) and said sixth (26) cavities are each provided with a tuning blind hole.
9. A dielectric waveguide filter according to claim 7 or 8, characterized in that a blind coupling hole is provided between the first resonator (21) and the second resonator (22), between the second resonator (22) and the fifth resonator (25), between the third resonator (23) and the fourth resonator (24), and between the fourth resonator (24) and the sixth resonator (26), respectively.
10. A dielectric waveguide filter according to claim 3 or 5, characterized in that the first positive coupling window (61) and the second positive coupling window (62) are rectangular or elliptical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021667763.9U CN212434807U (en) | 2020-08-11 | 2020-08-11 | Dielectric waveguide filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021667763.9U CN212434807U (en) | 2020-08-11 | 2020-08-11 | Dielectric waveguide filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
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