CN115133243B - Small metal filter applied to 5G communication system - Google Patents
Small metal filter applied to 5G communication system Download PDFInfo
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- CN115133243B CN115133243B CN202210890863.5A CN202210890863A CN115133243B CN 115133243 B CN115133243 B CN 115133243B CN 202210890863 A CN202210890863 A CN 202210890863A CN 115133243 B CN115133243 B CN 115133243B
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a small metal filter applied to a 5G communication system, and belongs to the technical field of communication. The small metal filter includes: an upper cover plate, a lower cover plate and a filter cavity; eight resonators distributed in two rows are arranged in the filter cavity, and metal sheets are arranged at the tops of the resonators; the first, third, fourth, fifth, sixth and eighth resonators are located on the cavity wall, and the second and seventh resonators are located on the partition wall; the distance between the metal sheets at the top of the second, fourth, fifth and seventh resonators and the cavity wall is smaller than a preset threshold value, and the distance between the metal sheets at the top of the first, third, sixth and eighth resonators and the partition wall is smaller than a preset threshold value; the metal sheets on the tops of the third resonator and the sixth resonator are opposite in front, and negative cross coupling is formed through a first window formed on the side edge of the partition wall. In the invention, the consistency and the producibility of the small metal filter are better, the reliability is high, and the cover plate is not easy to deform during secondary reflow soldering, thereby avoiding frequency offset.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a small metal filter applied to a 5G communication system.
Background
5G（5 th Generation, fifth Generation mobile communication technology) communication is the most advanced communication technology at present, and various communication companies compete for research on related aspects. Sub 6GHz adopts MIMO (Multiple-Input Multiple-Output) technology, and a large number of filters need to be integrated inside the antenna, so that the insertion loss, out-of-band suppression, volume and weight of the filters are all required to be higher. The conventional metal filter cannot be integrated with an antenna due to its large volume and weight. At present, the common dielectric waveguide filter and antenna integration can meet the requirement of a 5G communication system, but because long-term reliability, far-end harmonic waves and the like limit the application of the dielectric waveguide in partial occasions, an ultra-small-volume small metal filter is a good choice.
At present, the small metal filter with small size can be equivalent to the size of the dielectric waveguide filter, and the requirement of integration with an array antenna is met, however, the small metal filter designed in a conventional mode cannot generate negative polarity cross coupling in a direct windowing mode, and the small metal filter needs to generate negative polarity cross coupling in a flying rod and dumbbell mode. However, the dumbbell needs to be mounted using PTFE as a support, and the small metal filter which is miniaturized is small in size, the dumbbell and PTFE are small in size, mounting is difficult, and accuracy is difficult to secure, resulting in poor consistency and productivity of the small metal filter and low reliability. In addition, the top of the resonator of the small metal filter is loaded with a metal sheet, and the metal sheet and the cover plate are coupled through a gap to reduce the resonance frequency, so that the frequency of the small metal filter is greatly shifted as long as the cover plate is slightly deformed when the small metal filter is subjected to secondary reflow soldering.
Disclosure of Invention
The invention provides a small metal filter applied to a 5G communication system, which is used for solving the problems that the consistency and the producibility of the small metal filter are poor, the reliability is low, and a cover plate is easy to deform during secondary reflow soldering, so that the frequency of the small metal filter is greatly deviated due to the fact that dumbbell is adopted to generate negative cross coupling. The technical scheme is as follows:
in one aspect, there is provided a small metal filter applied to a 5G communication system, the small metal filter comprising: the filter comprises an upper cover plate, a lower cover plate and a filter cavity which is positioned between the upper cover plate and the lower cover plate and penetrates through the upper cover plate and the lower cover plate up and down;
eight resonators distributed in two rows are arranged in the filter cavity, and a metal sheet is arranged at the top of each resonator;
a first, a third, a fourth, a fifth, a sixth and an eighth of the eight resonators are located on the cavity wall, and a second and a seventh of the eight resonators are located on the partition wall; the distance between the metal sheets at the top of the second, fourth, fifth and seventh resonators and the cavity wall is smaller than a predetermined threshold value, and the distance between the metal sheets at the top of the first, third, sixth and eighth resonators and the partition wall is smaller than a predetermined threshold value;
the third resonator is opposite to the front surface of the metal sheet at the top of the sixth resonator, and the first window arranged on the side edge of the partition wall forms negative polarity cross coupling.
In one possible implementation, the size of the first window has a positive correlation with the strength of the coupling coefficient.
In one possible implementation, the aspect ratio of the first window is adjusted to adjust the parasitic coupling between the third and fifth resonators and to adjust the parasitic coupling between the fourth and sixth resonators.
In one possible implementation, the second resonator and the seventh resonator form a cross-coupling of positive polarity through a second window formed in the partition wall.
In one possible implementation, the first resonator and the eighth resonator are opposite in front of the metal sheet on top of each other, and the cross coupling of negative polarity is formed by a third window formed in the partition wall.
In one possible implementation, the area size of the metal sheet is inversely related to the size of the resonant frequency of the resonator.
In one possible implementation, the small metal filter further includes an input and an output, the first resonator being connected to a first tap of the input, and the eighth resonator being connected to a second tap of the output;
the metal sheet at the top of the first resonator and the metal sheet at the top of the eighth resonator are bent backwards.
In one possible implementation, the metal sheet at the top of the third resonator and the metal sheet at the top of the sixth resonator are bent back.
In one possible implementation, the filter cavity is made by powder metallurgy and top-bottom demoulding.
In one possible implementation, the length and width of the cross section in the small metal filter are both less than 1/2 of the operating wavelength.
The technical scheme provided by the invention has the beneficial effects that at least:
the small metal filter consists of the upper cover plate, the lower cover plate and the filter cavity, and the resonant cavity is directly arranged on the cavity wall and the partition wall in the filter cavity, and is directly coupled with the cavity and the wall through the metal sheet at the top of the resonator, so that the resonant frequency is reduced, and the size of the small metal filter is reduced. The third resonator is opposite to the front side of the metal sheet at the top of the sixth resonator, and the first window formed on the side edge of the partition wall forms negative polarity cross coupling, so that the flying rod and dumbbell are not required to be adopted to generate negative polarity cross coupling, the consistency and the producibility of the small metal filter are good, and the reliability is high.
When the resonator is located on the partition wall, the metal sheet on the top of the resonator is coupled with the cavity wall, so that the resonant frequency can be reduced. In addition, the resonator, the metal sheet and the cavity wall are integrated, so that the resonator can be kept stable at high temperature and during secondary reflow soldering, deformation can not occur, and the frequency of the small metal filter can not be greatly shifted, so that the problem of performance degradation can be avoided.
The length and the width of the cross section in the small metal filter are smaller than 1/2 of the working wavelength, and the requirements of integration in an array antenna array can be met.
The area of the metal sheet is increased by bending back, thereby lowering the resonance frequency without increasing the size of the small metal filter.
By loading the metal sheet, harmonics of 3 times or more can be suppressed without the need for a low pass filter.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a small metal filter applied to a 5G communication system in one embodiment of the invention;
FIG. 2 is a three-dimensional schematic of a filter cavity in one embodiment of the invention;
FIG. 3 is a schematic plan view of a filter cavity in one embodiment of the invention;
FIG. 4 is a graph of the frequency response of a small metal filter in one embodiment of the invention;
fig. 5 is a frequency response plot of the far end of a small metal filter in one embodiment of the invention.
Description of the embodiments
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings.
Referring to fig. 1, in fig. 1, a small metal filter with a center frequency of 3.6GHz and four transmission zeros of 8 orders with a bandwidth of 400MHz is taken as an example, and the above technology can be extended to other small metal filters of other orders.
The small metal filter shown in fig. 1 includes: the filter comprises an upper cover plate 110, a lower cover plate 120 and a filter cavity 130 which is arranged between the upper cover plate 110 and the lower cover plate 120 and penetrates up and down. The upper cover plate 110, the lower cover plate 120 and the filter cavity 130 may be assembled by welding.
The filter cavity 130 may be manufactured by a powder metallurgy process and may be obtained by means of upper and lower die stripping.
Eight resonators 131 distributed in two rows are provided in the filter cavity 130. As shown in fig. 1, first to four resonators 131 among eight resonators 131 are aligned, fifth to eight resonators 131 are aligned, and two rows of resonators 131 are parallel to each other. Wherein a first, third, fourth, fifth, sixth and eighth resonator 131 of the eight resonators 131 is located on the cavity wall 133, a second and seventh resonator 131 is located on the partition 134, and the partition 134 is located between the two rows of resonators 131.
In this embodiment, a metal sheet 132 is provided on top of each resonator 131. Wherein the distances between the metal sheets 132 on top of the second, fourth, fifth and seventh resonators 131 and the cavity wall 133 are smaller than a predetermined threshold value, and the distances between the metal sheets 132 on top of the first, third, sixth and eighth resonators 131 and the partition wall 134 are smaller than a predetermined threshold value. Wherein the predetermined threshold may be a small value such that the distance between the metal sheet 132 and the cavity wall 133 is relatively short, resulting in a relatively large loading capacitance, thereby reducing the resonant frequency of each resonator 131 and reducing the size of the small metal filter.
The area of the metal sheet 132 is inversely related to the resonant frequency of the resonator 131. That is, the larger the area of the metal sheet 132, the stronger the coupling capacitance between the metal sheet 132 and the cavity wall 133, and the lower the resonance frequency; the smaller the area of the metal sheet 132, the weaker the coupling capacitance between the metal sheet 132 and the cavity wall 133, and the higher the resonant frequency.
The metal sheet 132 is less coupled with the upper cover plate 110 and the lower cover plate 120, mainly coupled with the cavity wall 133 and the partition wall 134, and the resonator 131, the metal sheet 132 and the cavity wall 133 are integrated, so that the sensitive part is very stable, and the stability of the small metal filter during the processes of high temperature and secondary reflow soldering and the like can be ensured, and the performance of the small metal filter is not changed.
Referring to fig. 2 and 3, the third resonator 131 and the metal sheet 132 on top of the sixth resonator 131 are opposite in front, and form a cross coupling of negative polarity through the first window 135 opened on the side of the partition 134. Wherein, the first window 135 is a notch formed directly on the partition 134, so that the front surfaces of the third resonator 131 and the metal sheet 132 on the top of the sixth resonator 131 are opposite to each other, forming a cross coupling with negative polarity, thereby generating two symmetrical transmission zeros near the passband. Therefore, a flying lever and dumbbell mode is not needed to generate negative polarity cross coupling, so that the consistency and the producibility of the small metal filter are good, and the reliability is high.
The size of the first window 135 has a positive correlation with the strength of the coupling coefficient. That is, the larger the size of the first window 135, the stronger the coupling coefficient, the closer the transmission zero is to the channel; the smaller the size of the first window 135, the weaker the coupling coefficient, and the farther away from the channel the transmission zero.
Because there is a certain parasitic coupling between the third resonator and the fifth resonator, and there is a certain parasitic coupling between the fourth resonator and the sixth resonator, the parasitic coupling is positive, which makes the transmission zero at the high end of the passband closer to the passband, and the transmission zero at the low end of the passband slightly away from the passband, thereby resulting in a symmetrical zero imbalance. In order to improve parasitic coupling, it is necessary to ensure that the first window 135 does not open to the bottom, and the ratio of the length and width of the first window 135 is properly adjusted, so that the problem of zero point imbalance can be improved to some extent. That is, the aspect ratio of the first window 135 is adjusted so as to adjust the parasitic coupling generated between the third and fifth resonators 131 and the parasitic coupling generated between the fourth and sixth resonators 131.
In this embodiment, the second resonator 131 and the seventh resonator 131 form a cross coupling of positive polarity through the second window 136 formed in the partition 134, and two other transmission zeros are formed outside the pass band of the small metal filter.
In this embodiment, the first resonator 131 and the metal sheet 132 on top of the eighth resonator 131 are opposite in front, and form a cross coupling of negative polarity through a third window (not shown in fig. 2 and 3) opened in the partition 134, and two other transmission zeros are formed outside the pass band of the small metal filter.
In this embodiment, the small metal filter further includes an input terminal 140 and an output terminal 150, the first resonator 131 is connected to the first tap 141 of the input terminal 140, and the eighth resonator 131 is connected to the second tap 151 of the output terminal 150. Since the first resonator 131 is welded to the first tap 141 and the eighth resonator 131 is welded to the second tap 142, it is necessary to enlarge the metal plate 132. In order not to increase the volume of the small metal filter, the volume of the metal sheet 132 may be increased in a backward bent manner, thereby lowering the resonance frequency of the corresponding resonator 131. That is, the metal sheet 132 on the top of the first resonator 131 and the metal sheet 132 on the top of the eighth resonator 131 are bent backward.
Since the third resonator 131 and the sixth resonator 131 correspond to the first window 135 on the partition 134, it is necessary to enlarge the metal sheet 132. In order not to increase the volume of the small metal filter, the volume of the metal sheet 132 may be increased in a backward bent manner, thereby lowering the resonance frequency of the corresponding resonator 131. That is, the metal sheet 132 on the top of the third resonator 131 is bent backward from the metal sheet 132 on the top of the sixth resonator 131.
The size of the small metal filter in fig. 1 is consistent with the external size of the 6-order ceramic filter applied on a large scale in the market at present, the external size is 30 x 19 x 6mm, and the length and the width of the cross section in the small metal filter are smaller than 1/2 of the working wavelength, so that the requirement of integrating in an array antenna array can be met. All dimensions of the specific small metal filter are obtained by simulation optimization through electromagnetic simulation software (HFSS, CST) according to the technical index of the filter.
Referring to the frequency response curve of the small metal filter shown in fig. 4, according to the frequency response curve, the small metal filter provided in this embodiment can realize the frequency response of 4 zeros of the 8 cavity within a small size range, and if a small third window is opened between the first resonator 131 and the eighth resonator 131, the frequency response of 6 zeros of the 8 cavity can also be realized.
Referring to the frequency response curve of the far end of the small metal filter shown in fig. 5, the far end suppression of more than 3 times frequency can be realized without adding a low pass filter.
In summary, in the small metal filter provided in this embodiment, since the small metal filter is composed of the upper cover plate, the lower cover plate and the filter cavity, and the resonant cavity is directly disposed on the cavity wall and the partition wall in the filter cavity, the resonant frequency is reduced by directly coupling the metal sheet on the top of the resonator with the cavity and the wall, so as to reduce the size of the small metal filter. The third resonator is opposite to the front side of the metal sheet at the top of the sixth resonator, and the first window formed on the side edge of the partition wall forms negative polarity cross coupling, so that the flying rod and dumbbell are not required to be adopted to generate negative polarity cross coupling, the consistency and the producibility of the small metal filter are good, and the reliability is high.
When the resonator is located on the partition wall, the metal sheet on the top of the resonator is coupled with the cavity wall, so that the resonant frequency can be reduced. In addition, the resonator, the metal sheet and the cavity wall are integrated, so that the resonator can be kept stable at high temperature and during secondary reflow soldering, deformation can not occur, and the frequency of the small metal filter can not be greatly shifted, so that the problem of performance degradation can be avoided.
The length and the width of the small metal filter are smaller than 1/2 of the working wavelength, and the requirements of integration in an array antenna array can be met.
The area of the metal sheet is increased by bending back, thereby lowering the resonance frequency without increasing the size of the small metal filter.
By loading the metal sheet, harmonics of 3 times or more can be suppressed without the need for a low pass filter.
The above description should not be taken as limiting the embodiments of the invention, but rather should be construed to cover all modifications, equivalents, improvements, etc. that may fall within the spirit and principles of the embodiments of the invention.
Claims (9)
1. A small metal filter for use in a 5G communication system, the small metal filter comprising: the filter comprises an upper cover plate, a lower cover plate and a filter cavity which is positioned between the upper cover plate and the lower cover plate and penetrates through the upper cover plate and the lower cover plate up and down;
eight resonators distributed in two rows are arranged in the filter cavity, and a metal sheet is arranged at the top of each resonator;
a first, a third, a fourth, a fifth, a sixth and an eighth of the eight resonators are located on the cavity wall, and a second and a seventh of the eight resonators are located on the partition wall; the distance between the metal sheets at the top of the second, fourth, fifth and seventh resonators and the cavity wall is smaller than a predetermined threshold value, and the distance between the metal sheets at the top of the first, third, sixth and eighth resonators and the partition wall is smaller than a predetermined threshold value;
the front surfaces of the metal sheets at the tops of the third resonator and the sixth resonator are opposite, and negative cross coupling is formed through a first window formed on the side edge of the partition wall;
the small metal filter further comprises an input end and an output end, a first resonator is connected with a first tap of the input end, and an eighth resonator is connected with a second tap of the output end; the metal sheet at the top of the first resonator and the metal sheet at the top of the eighth resonator are bent backwards.
2. The small metal filter according to claim 1, wherein the size of the first window has a positive correlation with the strength of the coupling coefficient.
3. The small metal filter of claim 1, wherein the aspect ratio of the first window is adjusted to adjust parasitic coupling between the third and fifth resonators and to adjust parasitic coupling between the fourth and sixth resonators.
4. The small metal filter for 5G communication system according to claim 1, wherein the second resonator and the seventh resonator form a cross-coupling of positive polarity through a second window opened in the partition wall.
5. The small metal filter for 5G communication system according to claim 1, wherein the first resonator and the eighth resonator are opposite from each other on the front side of the metal sheet on top of each other, and the cross coupling of negative polarity is formed by a third window formed in the partition wall.
6. The small metal filter applied to a 5G communication system according to claim 1, wherein the area size of the metal sheet has a negative correlation with the size of the resonance frequency of the resonator.
7. The small metal filter according to claim 1, wherein the metal sheet on top of the third resonator is folded back with the metal sheet on top of the sixth resonator.
8. The small metal filter applied to a 5G communication system according to claim 1, wherein the filter cavity is made by powder metallurgy and up-down demoulding.
9. A small metal filter applied to a 5G communication system according to any of claims 1 to 8, wherein the length and width of the cross section in the small metal filter are each less than 1/2 of the operating wavelength.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210890863.5A CN115133243B (en) | 2022-07-27 | 2022-07-27 | Small metal filter applied to 5G communication system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210890863.5A CN115133243B (en) | 2022-07-27 | 2022-07-27 | Small metal filter applied to 5G communication system |
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| Publication Number | Publication Date |
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| CN115133243A CN115133243A (en) | 2022-09-30 |
| CN115133243B true CN115133243B (en) | 2023-06-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1732158A1 (en) * | 2005-05-30 | 2006-12-13 | Matsushita Electric Industrial Co., Ltd. | Microwave filter including an end-wall coupled coaxial resonator |
| EP3485528A4 (en) * | 2016-07-18 | 2020-03-04 | CommScope Italy S.r.l. | Tubular in-line filters that are suitable for cellular applications and related methods |
| CN214477833U (en) * | 2020-12-11 | 2021-10-22 | 广东通宇通讯股份有限公司 | Miniaturized high energy storage panel beating resonant chip wave filter |
| CN214477829U (en) * | 2021-04-16 | 2021-10-22 | 昆山立讯射频科技有限公司 | Resonant filter |
| CN215342908U (en) * | 2021-04-26 | 2021-12-28 | 广东通宇通讯股份有限公司 | 5G sheet metal filter |
| CN113437457A (en) * | 2021-06-21 | 2021-09-24 | 广东通宇通讯股份有限公司 | Miniaturized filter |
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