CN111834710A - Filter and communication base station - Google Patents
Filter and communication base station Download PDFInfo
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- CN111834710A CN111834710A CN202010756057.XA CN202010756057A CN111834710A CN 111834710 A CN111834710 A CN 111834710A CN 202010756057 A CN202010756057 A CN 202010756057A CN 111834710 A CN111834710 A CN 111834710A
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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 invention relates to a filter and a communication base station, which comprise a body made of dielectric materials and at least one pair of dielectric resonators arranged on the surface of the body, wherein two coupling grooves are arranged between a first dielectric resonator hole and a second dielectric resonator hole of each pair of dielectric resonators, and the first dielectric resonator hole and the second dielectric resonator hole are positioned on the same surface of the body; the first coupling groove is in a strip shape, is positioned on the same surface with the dielectric resonator hole and is communicated with the first dielectric resonator hole; the cross section of the second coupling groove is in a herringbone shape and is positioned on the opposite surface of the dielectric resonator hole; the first coupling slot is communicated with the second coupling slot, and the first dielectric resonator and the second dielectric resonator are coupled in a capacitive mode through the coupling slot. The invention has the technical effects of simply and flexibly adjusting the coupling bandwidth, not exciting parasitic resonance, leading the far-end out-of-band rejection to be excellent and being convenient for mass production.
Description
Technical Field
The invention relates to communication equipment, in particular to a cross coupling technology of a dielectric filter.
Background
Along with the construction of a 5G communication system, the requirement of equipment on the integration level is higher and higher, the miniaturization and the light weight of the microwave filter are the future application trend, and the dielectric waveguide has the advantages of high Q value, small temperature drift and the like, so that the microwave filter is a good miniaturization solution of the filter.
The dielectric filter usually needs to introduce capacitive cross coupling to achieve the effect of strong suppression of transmission zero, and a capacitive coupling structure (a single high-end transmission zero does not need to be introduced at times) needs to be introduced to achieve low-end transmission zero and symmetric transmission zero, and the capacitive coupling achieved by the conventional dielectric waveguide filter usually takes the following forms: firstly, a frequency-variable coupling structure is adopted, and although the structure is simple, an additional resonance point is introduced. And secondly, a capacitive coupling structure directly derived from a traditional cavity filter flying rod structure is relatively complex, and parts and processes of a product are increased.
CN 108598635 a discloses a dielectric filter, which realizes capacitive coupling by a deep blind hole with a depth exceeding one-half of the body, and this scheme simplifies the manufacturing process for realizing the capacitive coupling structure, but has the disadvantage of generating harmonics at the low end of the filter passband, reducing the rejection capability of the filter.
CN210468050U discloses a dielectric filter coupling structure for realizing symmetric transmission zeros, which includes two blind resonators located on the same surface, a first blind slot located below the body, and a second blind slot located above the body. The first blind groove extends towards one blind hole resonator, the second blind groove extends towards the other blind hole resonator, and the first blind groove and the second blind groove are connected with the through hole penetrating through the body. The scheme can not generate extra resonance outside the passband of the filter, and can improve the out-of-band rejection capability of the filter. However, the two resonators are located on the same surface, the magnetic field coupling is strong, the electric field coupling is weak, and the application scene is narrow.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and to provide a filter capable of avoiding the generation of parasitic resonance at the low end of the resonant frequency of the filter, and improving the far-end rejection of the filter at the low end of the frequency.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the filter comprises a body made of dielectric materials and at least one pair of dielectric resonators arranged on the surface of the body, wherein two coupling grooves are arranged between a first dielectric resonator hole and a second dielectric resonator hole of each dielectric resonator, and the first dielectric resonator hole and the second dielectric resonator hole are positioned on the same surface of the body; the first coupling groove is in a strip shape, is positioned on the same surface with the dielectric resonator hole and is communicated with the first dielectric resonator hole; the cross section of the second coupling groove comprises an arc-shaped part and is positioned on the opposite surface of the dielectric resonator hole; the first coupling slot is communicated with the second coupling slot, and the first dielectric resonator and the second dielectric resonator are coupled in a capacitive mode through the coupling slot.
Further:
a head extends from the back of the arc-shaped part of the cross section of the second coupling groove to enable the cross section of the second coupling groove to be in a herringbone shape.
The chevron head of the second coupling groove communicates with the first coupling groove, and the arcuate portion extends toward the opposite side of the second dielectric resonator hole.
The communication part of the first coupling groove and the second coupling groove is positioned in the center of the body.
The part of the first coupling groove communicated with the second coupling groove is arranged at a position deviated from the center of the body, and the coupling amount is adjusted by adjusting at least one of the following parameters: coupling slot height, coupling slot width, coupling window size, or distance between dielectric resonators.
The part of the first coupling groove communicated with the second coupling groove is a cylinder, an elliptic cylinder or a prism.
The second coupling groove and/or the first coupling groove are/is stepped.
The filter comprises a body made of dielectric materials and dielectric resonators arranged on the body, wherein four dielectric resonators are arranged at four corners of a quadrangle respectively, and a capacitive coupling structure is arranged between each two adjacent dielectric resonators; two coupling grooves are arranged between a first dielectric resonator hole and a second dielectric resonator hole of the pair of dielectric resonators, and the first dielectric resonator hole and the second dielectric resonator hole are positioned on the same surface of the body; the first coupling groove is in a strip shape, is positioned on the same surface with the dielectric resonator hole and is communicated with the first dielectric resonator hole; the cross section of the second coupling groove is in a herringbone shape and is positioned on the opposite surface of the dielectric resonator hole; the first coupling slot is communicated with the second coupling slot, and the first dielectric resonator and the second dielectric resonator are coupled in a capacitive mode through the coupling slot.
And a debugging blind hole for assisting in fine tuning the frequency of the dielectric resonator is coaxially arranged on the surface of the body opposite to the dielectric resonator hole and is coaxial with the dielectric resonator hole.
The debugging blind hole is circular, polygonal or oval, and the surface part of the debugging blind hole is not covered by the conducting layer.
There is provided a communications base station comprising a filter as claimed in any preceding claim.
Compared with the existing capacitive coupling structure, the capacitive coupling structure scheme of the filter and the communication base station has the following beneficial effects: more of the electric field can be directed from one dielectric resonator to the other, thereby enhancing the capacitive coupling between the resonators. Therefore, under the condition of keeping the same coupling strength, the distance between the coupling groove and the resonator can be increased, and the processing and molding of the medium are facilitated. In addition, the coupling bandwidth can be simply and flexibly adjusted without introducing extra parts and processes, and parasitic resonance can not be excited to enable far-end out-of-band rejection to be excellent, so that the performance and design flexibility of the product are guaranteed, the production difficulty is reduced, and mass production is facilitated.
Drawings
FIG. 1 is a schematic perspective view of an embodiment of a filter according to the present invention;
FIG. 2 is a schematic top surface structure of an embodiment of a filter of the present invention;
FIG. 3 is a schematic longitudinal sectional view of an embodiment of a filter according to the present invention;
FIG. 4 is a schematic perspective view of another embodiment of the filter of the present invention;
FIG. 5 is a schematic longitudinal sectional view of FIG. 4;
fig. 6 is a schematic perspective view of a filter according to another embodiment of the present invention;
FIG. 7 is a schematic view of the upper surface structure of FIG. 6;
FIG. 8 is a schematic longitudinal sectional view of FIG. 6;
fig. 9 is a schematic perspective view of an embodiment of the transmission zero of the cavity 2 of the filter 4 according to the present invention;
fig. 10 is a schematic top surface structure of an embodiment of the transmission zero of the cavity 2 of the filter 4 according to the invention;
FIG. 11 is a schematic view of the cut-away structure of FIG. 10;
figure 12 is a topological block diagram of capacitive and inductive coupling of an embodiment of the transmission zero of the cavity 2 of the filter 4 according to the invention;
FIG. 13 is a graph of the passband near end frequency response of a filter embodiment of the present invention;
figure 14 is a plot of the passband distal frequency response of an embodiment of the filter of the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
A filter, as shown in fig. 1 to 5, comprises a body 10 made of a dielectric material and at least one pair of dielectric resonators arranged on the surface of the body 10, wherein a coupling window 16 and two coupling grooves are arranged between a first dielectric resonator hole 11 and a second dielectric resonator hole 12 of the pair of dielectric resonators, the first dielectric resonator hole 11 and the second dielectric resonator hole 12 are positioned on the same surface of the body, and both the first dielectric resonator hole 11 and the second dielectric resonator hole 12 are blind holes. The first coupling groove 13 of the two coupling grooves is strip-shaped, is positioned on the same surface with the two dielectric resonator holes, and is communicated with the first dielectric resonator hole 11. The cross section of the second coupling groove 14 is arc-shaped, and the opposite surfaces of the dielectric resonator holes on the body are not communicated with the two dielectric resonator holes. The first coupling slot 13 and the second coupling slot 14 are partially communicated, and capacitive coupling is achieved between the first dielectric resonator and the second dielectric resonator through the coupling slots.
In some embodiments, as shown in fig. 6 to 8, the arc-shaped portion of the cross-section of the second coupling groove 14 extends with a head at the back side so that the cross-section of the second coupling groove is "chevron". The chevron-shaped head of the second coupling groove 14 communicates with the first coupling groove 13, and an arc portion other than the chevron-shaped head extends around the second dielectric resonator hole 12 so that the arc portion of the second coupling groove 14 is disposed symmetrically with respect to the chevron-shaped head portion. The chevron shape of the second coupling slot 14 has the advantage that more of the electric field can be directed from one dielectric resonator to the other, thereby enhancing the capacitive coupling between the resonators. Therefore, the distance between the coupling groove and the resonator can be increased under the condition of keeping the same coupling strength, thereby facilitating the processing and molding of the medium.
In some embodiments, as shown in fig. 6 to 8, the second coupling groove 14 is stepped, and the stepped second coupling groove 14 extends from the connection of the two coupling grooves toward the second dielectric resonator hole 12, so as to form a step (i.e., the above-mentioned portion with an arc-shaped cross section) surrounding the second dielectric resonator hole 12 and another step extending below the second dielectric resonator hole 12.
It is understood that in another embodiment, the first coupling groove 13 may be provided in a step shape, or both the first coupling groove 13 and the second coupling groove 14 may be provided in a step shape. The stepped coupling groove enlarges the area of the coupling groove and correspondingly increases the coupling strength.
As shown in fig. 1 to 3, the first dielectric resonator hole 11, the second dielectric resonator hole 12, and the first coupling groove 13 are provided on the upper surface of the body, and the second coupling groove 14 is provided on the lower surface of the body. As shown in fig. 4 and 5, the first dielectric resonator hole 11, the second dielectric resonator hole 12, and the first coupling groove 13 are provided on the lower surface of the body, and the second coupling groove 14 is provided on the upper surface of the body.
The surface of the dielectric filter body is covered with a metallization layer. The strength of this capacitive coupling is controlled by the relative positions of the two dielectric resonators, the distance of the coupling slot from the dielectric resonators, and the dimensions of the coupling slot and the coupling window.
In practical products, the strength of the capacitive coupling can be adjusted by removing the metallization layer, for example, by polishing the metallization layer of the coupling groove. The resonance frequencies of the two resonators can be tuned by removing the metallization layer of the resonator holes. In addition, the other side of the two resonator holes can be provided with a blind hole for adjusting the frequency of the resonator, reducing the depth of the resonator holes and facilitating the removal of the metallization layer.
Compared with the traditional capacitive coupling structure form, the capacitive coupling structure scheme of the dielectric filter can simply and flexibly adjust the coupling bandwidth without introducing extra parts and processes, and cannot excite parasitic resonance to enable the far-end out-of-band rejection to be excellent, so that the performance and design flexibility of the product are guaranteed, the production difficulty is reduced, and mass production is facilitated.
The communication part of the first coupling groove 13 and the second coupling groove 14 is positioned at the center of the body, the communication part is also arranged at a position deviated from the center of the body, and when the communication part is deviated from the center, the coupling amount is adjusted by adjusting at least one of the following parameters: coupling slot height, coupling slot width, coupling window size, or distance between dielectric resonators.
The filter may be applied in a wireless communication base station.
The following is a 4-cavity 2 transmission zero dielectric filter to explain the technical scheme of the invention in detail.
As shown in fig. 9 to 11, the entire outer layer of the body 10 of the filter in this embodiment is plated with silver, 4 dielectric resonators are disposed on the body, coupling windows are disposed between every two dielectric resonators, and a capacitive coupling structure and an inductive coupling structure are disposed in corresponding open coupling windows. The capacitive coupling structure of the present embodiment is disposed between the dielectric resonator 2 and the dielectric resonator 3, the dielectric resonator 2 and the dielectric resonator 3 being both located on the lower surface of the body, and the capacitive coupling structure includes a first coupling groove 6 and a second coupling groove 7 respectively located on the lower surface and the upper surface of the body. The first coupling groove 6 is long-strip-shaped, the second coupling groove 7 is herringbone, the first coupling groove is communicated with the second coupling groove, and the communicated part can be similar to a cylinder, an elliptic cylinder or a prism.
In this embodiment, except for capacitive coupling between the dielectric resonator 2 and the dielectric resonator 3, other couplings are inductive couplings, and are realized through a dielectric coupling window between the two resonators. The debugging blind holes 5 of the dielectric resonators 1, 2 and 4 are positioned on the upper surface of the body. The tuning blind hole 5 is a shallow hole for fine tuning the frequency of the resonator. The frequency of the resonators is adjusted by removing the metallization layer on the surface of the dielectric resonator, and the coupling between the resonators is adjusted by removing the metallization layer with the coupling window and the coupling groove structure. The debugging hole in the technical scheme can be in a special-shaped structure such as a circle, a polygon, an ellipse and the like.
The dielectric filter topology in this embodiment is shown in fig. 12, and a total of 2 transmission zeros are implemented, so as to implement the requirement of the near-end strong suppression index, as shown in fig. 13. Fig. 14 shows far-end rejection and parasitic resonance conditions of the filter, and the filter of the present invention additionally generates a pair of transmission zeros due to the coupling between the two ports because the input ports are close to each other, thereby further enhancing the out-of-band rejection of the filter. In addition, the coupling structure disclosed by the invention has no parasitic resonance at the low end of the filter passband, and the far end at the low end of the passband is well restrained. The coupling structure will have a parasitic resonance at the high end of the pass band, which is shown in the example to be around 4.5GHz, which is close to the secondary resonance frequency of the resonator and is not excited effectively, so that the high end of the pass band of the filter has a very good far-end rejection.
The technical scheme has the advantages of simple implementation mode of the coupling structure, easiness in processing and convenience in mass production. Filters to which the invention applies are not limited to the exemplified order, number of transmission zeros, topology. The resonator holes are not limited to a single surface or an upper surface, and may be all single surfaces, partial double surfaces, all double surfaces, or the like.
It should be understood that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some technical features; and such modifications and substitutions are intended to be included within the scope of the appended claims.
Claims (11)
1. A filter comprising a body made of a dielectric material and at least one pair of dielectric resonators provided on a surface of the body, two coupling grooves being provided between a first dielectric resonator hole and a second dielectric resonator hole of the pair of dielectric resonators, characterized in that: the first dielectric resonator hole and the second dielectric resonator hole are positioned on the same surface of the body; the first coupling groove is in a strip shape, is positioned on the same surface with the dielectric resonator hole and is communicated with the first dielectric resonator hole; the cross section of the second coupling groove comprises an arc-shaped part and is positioned on the opposite surface of the dielectric resonator hole; the first coupling slot is communicated with the second coupling slot, and the first dielectric resonator and the second dielectric resonator are coupled in a capacitive mode through the coupling slot.
2. The filter of claim 1, wherein: a head extends from the back of the arc-shaped part of the cross section of the second coupling groove to enable the cross section of the second coupling groove to be in a herringbone shape.
3. The filter of claim 2, wherein: the chevron head of the second coupling groove communicates with the first coupling groove, and the arcuate portion extends toward the opposite side of the second dielectric resonator hole.
4. The filter of claim 3, wherein: the communication part of the first coupling groove and the second coupling groove is positioned in the center of the body.
5. The filter of claim 1, wherein: the part of the first coupling groove communicated with the second coupling groove is arranged at a position deviated from the center of the body, and the coupling amount is adjusted by adjusting at least one of the following parameters: coupling slot height, coupling slot width, coupling window size, or distance between dielectric resonators.
6. The filter of claim 1, wherein: the part of the first coupling groove communicated with the second coupling groove is a cylinder, an elliptic cylinder or a prism.
7. The filter of claim 1, wherein: the second coupling groove and/or the first coupling groove are/is stepped.
8. A filter comprising a body made of a dielectric material and a dielectric resonator disposed on the body, characterized in that: the four dielectric resonators are respectively positioned at four corners of a quadrangle, and a capacitive coupling structure is arranged between each two adjacent dielectric resonators; two coupling grooves are arranged between a first dielectric resonator hole and a second dielectric resonator hole of the pair of dielectric resonators, and the first dielectric resonator hole and the second dielectric resonator hole are positioned on the same surface of the body; the first coupling groove is in a strip shape, is positioned on the same surface with the dielectric resonator hole and is communicated with the first dielectric resonator hole; the cross section of the second coupling groove is in a herringbone shape and is positioned on the opposite surface of the dielectric resonator hole; the first coupling slot is communicated with the second coupling slot, and the first dielectric resonator and the second dielectric resonator are coupled in a capacitive mode through the coupling slot.
9. The filter of claim 8, wherein: the herringbone head of the second coupling groove is communicated with the first coupling groove, and the arc-shaped part outside the herringbone head extends towards the right opposite side of the second dielectric resonator hole.
10. The filter of claim 9, wherein: and a debugging blind hole for assisting in fine tuning the frequency of the dielectric resonator is coaxially arranged on the surface of the body opposite to the dielectric resonator hole and is coaxial with the dielectric resonator hole.
11. A communication base station, characterized by: comprising a filter according to any of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010756057.XA CN111834710A (en) | 2020-07-31 | 2020-07-31 | Filter and communication base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010756057.XA CN111834710A (en) | 2020-07-31 | 2020-07-31 | Filter and communication base station |
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| Publication Number | Publication Date |
|---|---|
| CN111834710A true CN111834710A (en) | 2020-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010756057.XA Pending CN111834710A (en) | 2020-07-31 | 2020-07-31 | Filter and communication base station |
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| CN (1) | CN111834710A (en) |
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2020
- 2020-07-31 CN CN202010756057.XA patent/CN111834710A/en active Pending
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