CN112886162A - Small microwave medium dual-mode filter with asymmetric zero - Google Patents
Small microwave medium dual-mode filter with asymmetric zero Download PDFInfo
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- CN112886162A CN112886162A CN202110035149.3A CN202110035149A CN112886162A CN 112886162 A CN112886162 A CN 112886162A CN 202110035149 A CN202110035149 A CN 202110035149A CN 112886162 A CN112886162 A CN 112886162A
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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
- H01P1/2002—Dielectric waveguide filters
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Abstract
The embodiment of the invention discloses a small microwave dielectric dual-mode filter with asymmetric zero points, which comprises: a metal diaphragm is arranged between every two adjacent resonant cavities and coupled through a coupling hole structure on the metal diaphragm; the plurality of series-connected resonant cavities comprise a plurality of series-connected metal-medium resonant cavities, and the first metal-medium resonant cavity and the last metal-medium resonant cavity are respectively connected with the N +1 metal resonant cavities and the N metal resonant cavities in series; the metal resonant cavity comprises a metal shell, a metal resonator arranged in the metal shell and a joint arranged on the metal shell, wherein a tap line is arranged in the joint and connected with the metal resonator; the metal-dielectric resonant cavity comprises a ceramic dielectric block and a metal sleeve, the ceramic dielectric block is embedded in the metal sleeve, and the ceramic dielectric block is provided with a plurality of coupling structures, so that the performances of small and compact size, low loss, large power capacity and out-of-band rejection are realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a small microwave medium dual-mode filter with an asymmetric zero.
Background
With the development of wireless communication technology, especially with the advent of the 5G era, 5G large-scale antenna technology has enabled the number of antennas to be multiplied, the number of channels may reach 64 or even 128, and each antenna needs to be equipped with a corresponding duplexer and the signal frequency selection and processing are performed by a corresponding filter, so the demand for the filter will increase greatly; meanwhile, the development of high integration and miniaturization of the 5G base station puts higher demands on the size and heat generation performance of the filter. The microwave dielectric waveguide filter, especially the microwave dielectric waveguide resonator filter, becomes the mainstream of the 5G microwave dielectric waveguide filter by virtue of the advantages of high Q value, low loss, small volume, light weight, low cost, good temperature drift resistance and the like, and has wide prospect.
The development of the key technology of 5G communication, such as Multiple-Input Multiple-Output (MIMO) technology, puts higher requirements on the size, weight, performance, and the like of a microwave filter integrated inside an antenna, including low insertion loss, high power capacity, large rectangular coefficient, small shape, light weight, and the like.
Based on the inherent defects of the traditional metal cavity filter, the size and the weight are large, and the like, the requirement of the development of a communication system cannot be met. Therefore, a microwave filter capable of adapting to the current communication technology development is in urgent need.
Disclosure of Invention
In view of the above, an object of the embodiments of the present invention is to overcome the above existing disadvantages, and to provide a small microwave dielectric dual-mode filter with asymmetric zeros, which is small and compact, has low loss and large power capacity.
The embodiment of the invention provides a small microwave dielectric dual-mode filter with asymmetric zero points, which comprises:
the resonant cavities are connected in series, a metal membrane is arranged between every two adjacent resonant cavities at intervals, and the adjacent resonant cavities are coupled through a coupling hole structure on the metal membrane; wherein the content of the first and second substances,
the plurality of series-connected resonant cavities comprise a plurality of series-connected metal-medium resonant cavities, wherein the first metal-medium resonant cavity and the last metal-medium resonant cavity are respectively connected with N +1 metal resonant cavities and N metal resonant cavities in series, N is not less than 1, and N is an integer.
The metal resonant cavity comprises a metal shell, a metal resonator arranged in the metal shell and a joint arranged on the metal shell, wherein a tap line is arranged in the joint and connected with the metal resonator;
the metal-medium resonant cavity comprises a ceramic medium block and a metal sleeve, the ceramic medium block is embedded on the metal sleeve, the ceramic medium block is provided with a plurality of coupling structures, and the ceramic medium block is used for generating an orthogonal polarization and merging mode.
Further in accordance with some embodiments of the present invention, two sets of the coupling structures include tuning holes for adjustment of frequency and coupling and tuning screws disposed within the tuning holes, wherein,
the tuning hole is a blind hole.
Further, the metal resonator is cylindrical or hexagonal prism-shaped.
Furthermore, the metal diaphragm is of a cubic structure, and the coupling hole is a through hole penetrating through the metal diaphragm.
Further, the coupling structures on two adjacent metal-dielectric resonant cavities are distributed in a staggered manner, and four resonant frequencies contained in the two adjacent metal-dielectric resonant cavities generate negative cross coupling.
Further, the coupling hole structure is a cross-shaped coupling hole structure;
the long side of the cross-shaped coupling hole structure is used for generating coupling of the main circuit of the filter, and the short side of the cross-shaped coupling hole structure is used for generating cross coupling.
Further, the coupling hole structure is a straight-line-shaped coupling hole structure.
According to some embodiments of the present invention, further, through holes are provided on the metal housing and the metal sleeve, a metal rod is provided in the through hole, the metal rod penetrates through the through hole and is used for connecting the metal resonant cavity, the metal diaphragm and the metal-dielectric resonant cavity in series, and the metal rod is fixedly connected to the metal resonant cavity through a nut.
According to some embodiments of the invention, further, the larger the thickness of the ceramic dielectric block is, the lower the resonance frequency is, the more the blind end of the blind hole extends to the center of the metal-dielectric cavity, and the higher the resonance frequency is.
Further, the cross section structure of the blind hole is trapezoidal or conical.
The invention has the beneficial effects that: the filter provides a solution that resonant frequency is used as an asymmetric zero point by adding resonant cavities at two sides of an input or output metal resonant cavity, and comprises a plurality of metal resonant cavities, metal-medium resonant cavities, metal diaphragms and the like. The metal resonant cavity is composed of a metal shell, a metal resonator inside the metal shell, a tap line, a tuning rod and the like. The metal resonant cavity introduces or derives signals through a tapped line; the metal resonator is used for generating a resonant frequency to form a passband. The metal-medium resonant cavity is composed of a metal sleeve, a notch ceramic medium block and the like. The ceramic dielectric block is embedded into the metal sleeve and is positioned at about half of the depth of the metal sleeve; the ceramic dielectric block has a blind hole structure, the structure is used for realizing an orthogonal polarization and merging mode, two frequencies are generated in a limited space, the size of the filter can be effectively reduced, and the Q value is improved. And all adjacent resonant cavities are connected through a metal diaphragm with a coupling hole structure, and the coupling hole structure can realize energy coupling between the resonant cavities. Wherein, the plastic structure spare, the metal diaphragm all is equipped with the mounting hole on the metal casing, can realize the stable compact structure of small-size microwave medium bimodulus filter through four fastening screws.
The metal resonant cavity and the interior of the resonant cavity surrounded by the metal shell can be subjected to or not subjected to electroplating treatment. The metal resonator, the tap line and the like need to be subjected to silver electroplating layer treatment, so that insertion loss is reduced, and resonance performance is improved.
The filter can realize asymmetric zero points, has a compact structure, small loss, large power capacity and the like, and provides powerful basic guarantee for the development of the 5G communication technology on a large scale.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a front view of a small microwave dielectric dual-mode filter with an asymmetric zero according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of a small microwave dielectric dual-mode filter with an asymmetric zero according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a metal diaphragm according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a ceramic dielectric block according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a frequency response curve of a small microwave dielectric dual-mode filter with an asymmetric zero point according to an embodiment of the present invention.
In the figure:
1-a first metal resonant cavity; 2-a first metal-dielectric resonator; 3-a ceramic dielectric block; 4-a first metal resonator; 5-a first metal membrane; 6-a first joint; 7-first tap line; 8-a second metal membrane; 9-a nut; 10-a coupling aperture configuration; 11-debugging screws; 12-a tuning hole; 13-blind end; 14-a third metal diaphragm; 15-a second metal-dielectric resonator; 16-a second metal resonant cavity; 17-a second linker; 18-a second tap line; 19-a second metal resonator; 20-a third metal resonant cavity; 21-a fourth metal diaphragm; 22-third metal resonator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be fully described by the detailed description with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without inventive efforts fall within the scope of the present invention.
The small microwave dielectric dual-mode filter with the asymmetric zero provided by the embodiment of the invention comprises:
the resonant cavities are connected in series, a metal membrane is arranged between every two adjacent resonant cavities at intervals, and the adjacent resonant cavities are coupled through a coupling hole structure 10 on the metal membrane; wherein the content of the first and second substances,
the plurality of series-connected resonant cavities comprise a plurality of series-connected metal-medium resonant cavities, wherein the first metal-medium resonant cavity and the last metal-medium resonant cavity are respectively connected with N +1 metal resonant cavities and N metal resonant cavities in series, N is not less than 1, and N is an integer; wherein the content of the first and second substances,
the metal resonant cavity comprises a metal shell, a metal resonator arranged in the metal shell and a joint arranged on the metal shell, wherein a tap line is arranged in the joint and connected with the metal resonator, the metal resonant cavity introduces a signal through the tap line and transmits energy to the metal resonator, and the metal resonator resonates to generate a first resonant frequency;
the metal-medium resonant cavity comprises a ceramic medium block 3 and a metal sleeve, wherein the ceramic medium block 3 is embedded on the metal sleeve, the ceramic medium block 3 is provided with a plurality of coupling structures, and the ceramic medium block 3 is used for generating an orthogonal polarization and merging mode.
In the first embodiment, the first step is,
referring to fig. 1 and 2, there is shown a small microwave dielectric dual-mode filter of an asymmetric zero, comprising:
the third metal resonant cavity 20, the fourth metal diaphragm 21, the first metal resonant cavity 1, the first metal diaphragm 5, the first metal-dielectric resonant cavity 2, the second metal diaphragm 8, the second metal-dielectric resonant cavity 15, the third metal diaphragm 14 and the second metal resonant cavity 16 are sequentially connected in series;
specifically, the first metal resonator 1 comprises a metal shell, a first metal resonator 4 arranged in the metal shell, and a first joint 6 arranged on the metal shell, wherein a first tap line 7 is arranged inside the first joint 6, the first tap line 7 is connected with the first metal resonator 4, the first metal resonator 1 introduces a signal through the first tap line 7 and transmits energy to the first metal resonator 4, and the first metal resonator 4 resonates to generate a first resonant frequency; four through holes are formed in the metal shell and the metal sleeve, metal rods are arranged in the through holes, penetrate through the through holes and are used for being connected with the first metal resonant cavity 1, the first metal diaphragm 5, the first metal-medium resonant cavity 2, the second metal diaphragm 8, the second metal-medium resonant cavity 15, the third metal diaphragm 14 and the second metal resonant cavity 16 in series, and the metal rods are fixedly connected with the first metal resonant cavity 1 and the second metal resonant cavity 16 through nuts 9 respectively;
the second metal resonant cavity 16 comprises a metal shell, a second metal resonator 19 arranged in the metal shell, and a second joint 17 arranged on the metal shell, wherein a second tap line 18 is arranged inside the second joint 17, the second tap line 18 is connected with the second metal resonator 19, the energy of the second metal-medium resonant cavity 15 is transmitted into the second metal resonant cavity 16 through the third metal diaphragm 14, resonance occurs in the resonant cavity to generate a resonant frequency, and meanwhile, the output of a signal is completed through the second tap line 18;
the third metal resonant cavity 20 comprises a metal shell and a third metal resonator 22 arranged in the metal shell, the third metal resonant cavity 20 is connected with the first metal resonant cavity 1 through a fourth metal diaphragm, and the strength of coupling energy can be controlled by controlling the position shape of a hole groove in the fourth metal diaphragm, the position of a zero point is adjusted, and the outer band rejection performance of the filter is improved.
The first metal-dielectric resonant cavity 2 and the second metal-dielectric resonator both comprise a ceramic dielectric block 3 and a metal sleeve; specifically, the ceramic dielectric block 3 is embedded in the metal sleeve, the ceramic dielectric block 3 is tightly matched with the metal sleeve without a gap, and specifically, the blind hole can be positioned and installed through a certain tool;
specifically, the metal resonator is in a column shape, preferably, a column or a hexagonal prism is adopted, and a cavity structure and a thread structure can be respectively arranged at two ends of the column-shaped metal resonator, so that the arrangement has the advantages that the cavity structure can realize the adjustment of resonance energy, a small hole is formed in the column-shaped side face of the metal resonator, and the metal resonator can be stably connected with a signal lead-in wire, namely a tap wire, in a welding mode and the like.
For convenience of description, the present embodiment is described by using two symmetrical coupling structures formed on the ceramic dielectric block 3, and the ceramic dielectric block 3 is used for generating the orthogonal polarization combining mode.
Referring to fig. 4, two sets of coupling structures of the ceramic dielectric block 3 according to the embodiment of the present invention include tuning holes 12, and referring to fig. 2, tuning holes 12 are fitted with tuning screws 11, and the tuning holes 12 are used for adjusting frequency and coupling, wherein,
specifically, the tuning hole 12 is a blind hole, the relative position of the blind hole can be adjusted according to actual conditions, for convenience of description, the opening direction of the blind hole deviates from each other, and the cross-sectional structure of the blind hole is trapezoidal or conical.
Referring to fig. 3, in the metal diaphragm structure provided in the embodiment of the present invention, it can be seen that the metal diaphragm has a cubic structure, and the coupling hole is a through hole penetrating through the metal diaphragm.
Specifically, the coupling hole structure 10 on the second metal diaphragm 8 between the first metal-dielectric resonant cavity 2 and the second metal-dielectric resonant cavity 15 is a cross-shaped coupling hole structure 10;
more specifically, the long side of the cross-shaped coupling hole structure 10 is used to generate coupling of the main filter path, and the short side is used to generate cross-coupling.
The coupling hole structures 10 on the first metal diaphragm 5 between the first metal resonant cavity 1 and the first metal-medium resonant cavity 2 and the third metal diaphragm 14 between the second metal-medium resonant cavity 15 and the second metal resonant cavity 16 are both in-line coupling hole structures 10;
the in-line coupling aperture structure 10 is used to provide an energy channel between the metal resonant cavity and the metal-dielectric resonant cavity.
The coupling structures on the first metal-dielectric resonant cavity 2 and the second metal-dielectric resonant cavity 15 are distributed in a staggered manner, and four resonant frequencies contained in the first metal-dielectric resonant cavity 2 and the second metal-dielectric resonant cavity 15 generate negative cross coupling, and two symmetrical transmission zeros are generated at two ends of the passband of the filter.
The larger the thickness of the ceramic dielectric block 3 is, the lower the resonant frequency is, the more the blind ends 13 of the two blind holes extend to the center of the metal-dielectric cavity, and the higher the resonant frequency is.
As shown in fig. 5, which is a frequency response curve of the filter, it can be seen from the response curve that the filter has asymmetric transmission zeros on the left and right sides of the passband.
The working principle of the invention is as follows: the first metal resonant cavity introduces signals through the first tapped line and transfers energy to the first metal resonator, and the first metal resonator resonates to generate a resonant frequency. The coupling hole slot on the fourth metal diaphragm provides a channel for energy transmission between the third metal resonant cavity and the first metal resonant cavity, and energy forms a resonant frequency in the third metal resonant cavity. By controlling the position and the shape of the hole groove in the fourth metal diaphragm, the intensity of coupling energy can be controlled, the position of a zero point can be adjusted, and the out-of-band rejection performance of the filter can be improved. Further, the electromagnetic energy of the first metal resonant cavity is transferred into the first metal-dielectric resonant cavity through the first metal diaphragm, and orthogonal polarization-degenerate modes are generated under the action of the first ceramic dielectric block, so that two resonant frequencies are generated. The side face of the first ceramic dielectric block comprises two notch blind hole coupling structures, and the length, the relative angle, the relative position and the like of the notch blind holes can influence the resonant frequency and the coupling amount of the two modes. In particular, the resonant frequency and relative coupling can be adjusted by installing a tuning screw on the metal-dielectric resonant cavity. Likewise, the electromagnetic energy in the first metal-dielectric resonator is coupled into the second metal-dielectric resonator through the second metal diaphragm and two resonant frequencies are generated therein. Specifically, the orthogonal polarization merged modes in the first and second metal-dielectric resonators correspond, and the amount of coupling in the corresponding modes can be adjusted by adjusting the relative areas of the coupling slots in the second metal diaphragm. Further, the energy of the second metal-dielectric resonant cavity is transmitted to the second metal resonant cavity through the third metal diaphragm, resonance occurs in the metal resonant cavity, a resonance frequency is generated, and meanwhile, the output of signals is completed through the second tap line.
Through setting up metal-dielectric resonator and ceramic dielectric block resonator, with the mode of orthogonal polarization doubling as the mode of operation, generate two resonant frequency, compare with traditional metal cavity filter, effectively reduce the size of filter, improved the Q value. The ceramic dielectric block is provided with the notch blind hole, the metal-dielectric resonant cavity is provided with the tuning screw, and the resonant frequency and the coupling quantity of the resonant cavity are conveniently adjusted and controlled through the adjusting effect of the notch structure.
The sizes of the first, second and third metal resonant cavities can be the same or different, and can be adjusted according to index requirements such as designed frequency band bandwidth and the like.
First, the size of the third metal resonator can be the same or different, and the size can be modified according to the frequency index.
The number of the metal resonant cavities is not limited, the metal resonant cavities can be increased or decreased according to design requirements, and the out-of-band rejection performance of the metal resonant cavities is improved.
The number of the metal-medium resonant cavities is not limited, and can be increased or decreased according to design requirements, and the like, but the number of the metal membranes is ensured to be increased or decreased accordingly.
And the fourth metal membrane is used for controlling the coupling between the first metal resonant cavity and the third metal resonant cavity. The metal diaphragm is provided with a coupling through hole groove, the structure of the hole groove, such as the relative area of the hole groove, can effectively adjust the relative coupling and the relative frequency between the first metal resonant cavity and the third metal resonant cavity, and improve the out-of-band rejection performance.
The coupling structures between the first metal-medium resonant cavity and the second metal-medium resonant cavity and between the second metal-medium resonant cavity and the second metal resonant cavity are realized by adopting metal diaphragms.
The first and second metal-dielectric resonant cavities can perform electrosilvering layer treatment on the inner wall of the metal sleeve, and the metal-dielectric resonant cavities have the advantages of improving the Q value and reducing the loss.
The side surface of the ceramic dielectric block and the inner wall of the first metal-dielectric resonant cavity can be in close contact in a physical mode, and one implementation mode of the method can effectively reduce poor crimping by heating the metal sleeve and then crimping the dielectric.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that the features of the various embodiments of the invention may be partially or fully coupled to each other or combined and may be capable of cooperating with each other in various ways and of being technically driven. Numerous variations, rearrangements, combinations, and substitutions will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A small microwave dielectric dual-mode filter with asymmetric zero, comprising:
the resonant cavities are connected in series, a metal membrane is arranged between every two adjacent resonant cavities at intervals, and the adjacent resonant cavities are coupled through a coupling hole structure on the metal membrane; wherein the content of the first and second substances,
the plurality of series-connected resonant cavities comprise a plurality of series-connected metal-medium resonant cavities, wherein the first metal-medium resonant cavity and the last metal-medium resonant cavity are respectively connected with N +1 metal resonant cavities and N metal resonant cavities in series, wherein N is more than or equal to 1;
the metal resonant cavity comprises a metal shell, a metal resonator arranged in the metal shell and a joint arranged on the metal shell, wherein a tap line is arranged in the joint and connected with the metal resonator;
the metal-medium resonant cavity comprises a ceramic medium block and a metal sleeve, the ceramic medium block is embedded on the metal sleeve, the ceramic medium block is provided with a plurality of coupling structures, and the ceramic medium block is used for generating an orthogonal polarization and merging mode.
2. The asymmetric zero compact microwave dielectric dual-mode filter as claimed in claim 1, wherein the coupling structure comprises tuning holes for frequency and coupling adjustment and tuning screws disposed in the tuning holes, wherein,
the tuning hole is a blind hole.
3. The asymmetric zero small microwave dielectric dual-mode filter as claimed in claim 1, wherein the metal diaphragm is a cubic structure, and the coupling hole is a through hole penetrating through the metal diaphragm.
4. The asymmetric zero compact microwave dielectric dual-mode filter as claimed in claim 1, wherein the coupling structures on two adjacent metal-dielectric resonators are distributed in a staggered manner, and four resonant frequencies contained in the two adjacent metal-dielectric resonators generate negative cross coupling.
5. The asymmetric zero small microwave dielectric dual-mode filter as claimed in claim 1, wherein the coupling hole structure on the metal diaphragm is a cross-shaped coupling hole structure;
the long side of the cross-shaped coupling hole structure is used for generating coupling of the main circuit of the filter, and the short side of the cross-shaped coupling hole structure is used for generating cross coupling.
6. The asymmetric zero small microwave dielectric dual-mode filter as claimed in claim 1, wherein the coupling hole structure is a in-line coupling hole structure.
7. The asymmetric zero small microwave dielectric dual-mode filter as claimed in claim 1, wherein the metal resonator has a cylindrical or hexagonal prism shape.
8. The asymmetric-zero small microwave dielectric dual-mode filter as claimed in claim 1, wherein the metal housing and the metal sleeve are provided with through holes, and metal rods are disposed in the through holes and penetrate through the through holes for connecting the metal resonant cavity, the metal diaphragm and the metal-dielectric resonant cavities in series.
9. The asymmetric zero small microwave dielectric dual-mode filter as claimed in claim 2, wherein the larger the thickness of the ceramic dielectric block is, the lower the resonance frequency is, and the more the blind end of the blind hole extends to the center of the metal-dielectric cavity, the higher the resonance frequency is.
10. The asymmetric zero small microwave dielectric dual-mode filter as claimed in claim 2, wherein the cross-sectional structure of the blind hole is trapezoidal or tapered.
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| CN111403876A (en) * | 2020-04-27 | 2020-07-10 | 江苏贝孚德通讯科技股份有限公司 | Small-sized mixed mode filter with two resonant cavities |
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| CN202487730U (en) * | 2012-02-13 | 2012-10-10 | 江苏贝孚德通讯科技股份有限公司 | Dual-mode medium loading cavity filter with circular cut corners |
| CN109983616A (en) * | 2016-11-29 | 2019-07-05 | 华为技术有限公司 | A kind of filter and communication equipment |
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