CN213425159U - Coaxial cavity filter of hollow capacitive coupling rod - Google Patents
Coaxial cavity filter of hollow capacitive coupling rod Download PDFInfo
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- CN213425159U CN213425159U CN202022567044.6U CN202022567044U CN213425159U CN 213425159 U CN213425159 U CN 213425159U CN 202022567044 U CN202022567044 U CN 202022567044U CN 213425159 U CN213425159 U CN 213425159U
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- filter
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- 230000008878 coupling Effects 0.000 title claims abstract description 60
- 238000010168 coupling process Methods 0.000 title claims abstract description 60
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 60
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910001374 Invar Inorganic materials 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006880 cross-coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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Abstract
The utility model discloses a coaxial cavity filter of hollow capacitive coupling pole, it includes: a filtering cavity; the first resonant column and the second resonant column are arranged in the filter cavity, and the coupling resonant column is arranged between the first resonant column and the second resonant column; the capacitive coupling rod transversely penetrates through the coupling resonance column; an insulating medium for isolating the capacitive coupling rod from the coupling resonance column; the cover plate is used for covering the filtering cavity; the tuning screw is fixed on the cover plate, and the tail end of the tuning screw penetrates through the cover plate and extends into the filter cavity to be respectively matched with the first resonance column, the second resonance column and the coupling resonance column; the capacitive coupling rod is of a hollow fully-enclosed structure. The beneficial effects of the utility model are that remove the solution problem from the temperature change volume expansion coefficient's of material angle, also reduce the volume of key part (capacitive coupling pole) promptly to reduce linear dimension's change volume in the direction from the three axial coordinate of XYZ.
Description
Technical Field
The utility model relates to a communication equipment field technique especially relates to a coaxial cavity filter of hollow capacitive coupling pole.
Background
The coaxial cavity filter is one of indispensable devices in modern wireless communication systems, and plays an important role in frequency-selective filtering. The coaxial cavity filter has the advantages of high Q value, low insertion loss, high power capacity and the like, and is widely applied to various communication devices. In order to suppress clutter outside the filter passband to the maximum extent and improve out-of-band rejection capability, a capacitive coupling rod is used in design to play a role in suppressing a set frequency value outside the band, namely: transmission zero. Transmission zero point: it is the filter transfer function that is equal to zero, i.e. the energy at this frequency point cannot pass through the network, thus playing a role of complete isolation. Generally, the band-pass filter has a transfer function which tends to be zero at an infinite frequency point, which is called an infinite transmission zero point, but has no practical significance because of the infinite frequency point. In order to effectively suppress the outside of the passband in a band pass filter designed in practice, transmission zeros need to be introduced at some specific frequency points. This is the function of the capacitive coupling rod. The capacitive coupling rod is added between two cavities with single cavity or multiple cavities at intervals, and energy transmission on a certain resonant frequency point is zero due to different phase shift degrees of the capacitive coupling rod. However, due to the influence of the thermal expansion coefficient of the material used for the capacitive coupling rod, the linear dimension of the capacitive coupling rod of the cavity filter changes correspondingly when the temperature changes, thereby affecting the frequency value of the transmission zero point. Therefore, in order to ensure that the cavity filter normally works in a certain temperature range, the technical problem of reducing or even eliminating the transmission zero frequency drift caused by the temperature drift phenomenon is solved.
In the prior art, a solid capacitive coupling rod is adopted, and the problem is solved from the perspective of the temperature change linear expansion coefficient of a material in the current technical scheme, namely when the temperature drift of the coaxial cavity filter does not reach the standard, the material of the solid capacitive coupling rod with the lower linear expansion coefficient is replaced, so that the material cost and the processing cost are increased by dozens of times. Coefficient of linear expansion: iron invar steel special ceramics, and the synthesis: the special ceramic is approximately 10 times of invar steel, and the invar steel is approximately 10 times of iron. For example, chinese utility model patent publication No. CN204144407U discloses a filter capacitor cross-coupling structure, which includes a filter cavity, a first resonant column, a second resonant column and a coupling resonant column, wherein the first resonant column and the second resonant column are disposed in the filter cavity; a transverse channel is arranged on the coupling resonance column; the capacitive coupling rod is arranged in the transverse channel; an insulating support is arranged between the capacitive coupling rod and the transverse channel; the capacitive coupling rod is a solid capacitive coupling rod.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to realize the suppression to the temperature drift phenomenon of coaxial filter cavity transmission zero point, can only use the material of lower linear expansion coefficient, so the cost is very high, provides a coaxial cavity filter of hollow capacitive coupling pole for this reason.
The technical scheme of the utility model is that: a hollow capacitively coupled rod coaxial cavity filter comprising: a filtering cavity; the first resonant column and the second resonant column are arranged in the filter cavity, and the coupling resonant column is arranged between the first resonant column and the second resonant column; the capacitive coupling rod transversely penetrates through the coupling resonance column; an insulating medium for isolating the capacitive coupling rod from the coupling resonance column; the cover plate is used for covering the filtering cavity; the tuning screw is fixed on the cover plate, and the tail end of the tuning screw penetrates through the cover plate and extends into the filter cavity to be respectively matched with the first resonance column, the second resonance column and the coupling resonance column; the capacitive coupling rod is of a hollow fully-enclosed structure.
In the scheme, the insulating medium is coated on the surface of the tuning screw rod.
In the scheme, the capacitive coupling rod is formed by rapid forming and processing.
The improvement of the scheme is that connectors are installed at two ends of the filter cavity, and a coupling disc is arranged at one end, located in the filter cavity, of each connector.
In the scheme, the cover plate is fixed at the top of the filtering cavity through the cover plate screw.
In the scheme, the top surface of the cover plate is provided with the nut, and the nut is sleeved at the upper end of the tuning screw rod.
In the scheme, the connectors are mounted at two ends of the filtering cavity through connector screws.
The utility model has the advantages that the transmission zero frequency value of the capacitive coupling rod can be reduced without adopting materials with low linear expansion coefficient, the influence of out-of-band suppression temperature drift on the coaxial cavity filter is reduced, and the scheme is a low-cost solution; the problem is solved from the perspective of the temperature change volume expansion coefficient of the material, namely, the volume of a key part (a capacitive coupling rod) is reduced, so that the change quantity of the linear dimension is reduced from the direction of three-axis coordinates of XYZ.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a cross-sectional view B-B of FIG. 1;
in the figure, 1, a filter cavity, 2, a first resonance column, 3, a second resonance column, 4, a coupling resonance column, 5 and a capacitive coupling rod; 6. insulating medium, 7, cover plate, 8, tuning screw, 9, connector, 10, coupling disc, 11, cover plate screw, 12, nut, 13, connector screw.
Detailed Description
The technical solution in the embodiment of the present invention is clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments of the ordinary skilled person in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1-2, the utility model comprises: a filtering cavity 1; the first resonant column 2 and the second resonant column 3 are arranged in the filter cavity, and the coupling resonant column 4 is arranged between the first resonant column and the second resonant column; a capacitive coupling rod 5 transversely penetrating the coupling resonance column; an insulating medium 6 for isolating the capacitive coupling rod from the coupling resonance column; a cover plate 7 for covering the filter cavity; the tuning screw 8 is fixed on the cover plate, and the tail end of the tuning screw penetrates through the cover plate and extends into the filter cavity to be respectively matched with the first resonance column, the second resonance column and the coupling resonance column; the capacitive coupling rod is of a hollow fully-enclosed structure.
One embodiment of the present invention is that the insulating medium is coated on the surface of the tuning screw.
The capacitive coupling rod in the utility model is formed by rapid forming and processing,
another embodiment of the utility model is the connector is installed at the filter cavity both ends, the one end that the connector is located the filter cavity has the coupling dish.
Another embodiment of the present invention is that the cover plate is fixed to the top of the filter cavity by a cover plate screw. The top surface of the cover plate is provided with a nut, and the nut is sleeved at the upper end of the tuning screw rod. The connectors are mounted at two ends of the filtering cavity through connector screws.
Claims (7)
1. A coaxial cavity filter of hollow capacitive coupling pole, characterized by: it includes: a filtering cavity; the first resonant column and the second resonant column are arranged in the filter cavity, and the coupling resonant column is arranged between the first resonant column and the second resonant column; the capacitive coupling rod transversely penetrates through the coupling resonance column; an insulating medium for isolating the capacitive coupling rod from the coupling resonance column; the cover plate is used for covering the filtering cavity; the tuning screw is fixed on the cover plate, and the tail end of the tuning screw penetrates through the cover plate and extends into the filter cavity to be respectively matched with the first resonance column, the second resonance column and the coupling resonance column; the capacitive coupling rod is of a hollow fully-enclosed structure.
2. The hollow capacitively coupled rod coaxial cavity filter of claim 1, wherein: the insulating medium is coated on the surface of the tuning screw rod.
3. The hollow capacitively coupled rod coaxial cavity filter of claim 1, wherein: the capacitive coupling rod is formed by rapid forming and processing.
4. The hollow capacitively coupled rod coaxial cavity filter of claim 1, wherein: connectors are installed at two ends of the filter cavity, and a coupling disc is arranged at one end, located in the filter cavity, of each connector.
5. The hollow capacitively coupled rod coaxial cavity filter of claim 1, wherein: the cover plate is fixed on the top of the filtering cavity through a cover plate screw.
6. The hollow capacitively coupled rod coaxial cavity filter of claim 1, wherein: the top surface of the cover plate is provided with a nut, and the nut is sleeved at the upper end of the tuning screw rod.
7. The hollow capacitively coupled rod coaxial cavity filter of claim 4, wherein: the connectors are mounted at two ends of the filtering cavity through connector screws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022567044.6U CN213425159U (en) | 2020-11-09 | 2020-11-09 | Coaxial cavity filter of hollow capacitive coupling rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022567044.6U CN213425159U (en) | 2020-11-09 | 2020-11-09 | Coaxial cavity filter of hollow capacitive coupling rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213425159U true CN213425159U (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022567044.6U Expired - Fee Related CN213425159U (en) | 2020-11-09 | 2020-11-09 | Coaxial cavity filter of hollow capacitive coupling rod |
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| Country | Link |
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| CN (1) | CN213425159U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114300822A (en) * | 2021-12-31 | 2022-04-08 | 广州广电计量检测股份有限公司 | Cavity filter |
-
2020
- 2020-11-09 CN CN202022567044.6U patent/CN213425159U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114300822A (en) * | 2021-12-31 | 2022-04-08 | 广州广电计量检测股份有限公司 | Cavity filter |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210611 |