CN203983432U - A kind of broadband filter that adopts single chamber four mould cavity resonator - Google Patents
A kind of broadband filter that adopts single chamber four mould cavity resonator Download PDFInfo
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- CN203983432U CN203983432U CN201420330375.XU CN201420330375U CN203983432U CN 203983432 U CN203983432 U CN 203983432U CN 201420330375 U CN201420330375 U CN 201420330375U CN 203983432 U CN203983432 U CN 203983432U
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Abstract
The utility model discloses a kind of broadband filter that adopts single chamber four mould cavity resonator, comprise cavity, the first port, the second port, the first perturbation metallic object and the second perturbation metallic object; Described the first perturbation metallic object and the second perturbation metallic object are arranged on the bottom in cavity, the center that cavity is all departed from the center of the first perturbation metallic object and the second perturbation metallic object, and the first perturbation metallic object and the second perturbation metallic object centered by the longitudinal centre line of cavity symmetrically; Described the first port and the second port are arranged on cavity, and run through chamber outer wall and inwall; Described the first port is provided with the first conductor assembly, and described the second port is provided with the second conductor assembly, and the axis of the axis of described the first conductor assembly and the second conductor assembly is perpendicular, and respectively perpendicular to the longitudinal centre line of cavity.The utlity model has high selectivity, high Q value, design and process simple feature, and there is wider fractional bandwidth, can be good at meeting the requirement of miniaturization communication.
Description
Technical field
The utility model relates to a kind of filter, and especially a kind of broadband filter that adopts single chamber four mould cavity resonator, belongs to wireless communication field.
Background technology
In present mobile communication technology, microwave radio device has become requisite important component part.Filter is as basic a kind of radio-frequency devices, and a series of indexs such as its insertion loss, Out-of-band rejection and power capacity have important impact for the performance of complete machine.The trend of system miniaturization portability requires filter unit in less space, to realize desired properties index.
For the demand, wave-guide cavity wave multi-mode filter has lot of advantages: the first, and high Q value; The second, high power capacity; The 3rd, wave-guide cavity wave multi-mode filter just can be realized the filtering characteristic that the required several chambeies of single mode could be realized in a cavity, and therefore, this advantage of miniaturization appears undoubtedly.This three large feature has ensured miniaturization and the high performance requirement of filter.We can not ignore medium multi-mode filter in product development, manufacture simultaneously; especially in the realization of large-scale production, there is lot of challenges; it is mainly following problem: one; the parasitic couplings of higher mode product complexity is very large for holotype impact, has greatly improved the complexity that emulation is especially debugged.Higher mode is treated in this requirement must, by its inherent characteristic, subdue negative effect, strengthens effectively utilizing; They are two years old, complicated tunable coupled structure, common cavity multimode tuning structure is screw, and in the problem that separates degenerate mode, adopt corner cut and with the electric field method that adds the screw that is coupled at 45 ° two polarization, like this difficulty of processing improves, thereby has improved processing cost.
With understanding, disclosed prior art is as follows according to investigations:
1) the separation degenerate mode of resonator generally have three kinds of method: a, as shown in Fig. 1 a and 1b, while realizing degenerate mode coupling by coupling screw, for fear of interaction, its position should be positioned near the electric field strength maximum of two resonance (will be coupled), and the region that all the other degenerate mode electric fields are zero, conventionally the electric field of coupling screw and two polarization is at 45 °, but this coupled modes tunable range is smaller; B, as shown in Fig. 2 a and 2b, above resonator 45° angle, put in coupling screw, can separate equally degenerate mode; C, as shown in Fig. 3 a and 3b, cut a rectangle corner cut, but this coupled modes are difficult for processing.
2) 1987, the scholars such as R.R.Bonetti deliver and are entitled as in " Quadruple-mode Filters " article at IEEE MTT-S digest, propose to separate degenerate mode by coupling screw, structure chart is as shown in Fig. 4 a, and realize single chamber four mould narrow band filters, if Fig. 4 b is the simulation result of this Structure Filter.Can find out from simulation result, this filter functional, but structure processing is relatively complicated.
3) in October, 2011, open imperial scholar and propose a kind of dielectric filter in " Microwave Coaxial Dielectric Filter research " article, as shown in Figure 5 a, and analyze at HFSS Electromagnetic Simulation software modeling, realized four mould band pass filters, simulation result figure as shown in Figure 5 b.But this complicated structure, and there is no transmission zero from simulation result can be found out band, Out-of-band rejection is poor.
Utility model content
The purpose of this utility model is the defect in order to solve above-mentioned prior art, provide a kind of and had advantages of that simple in structure, handling ease, performance are good, and there is wider fractional bandwidth, can meet the broadband filter of the employing list chamber four mould cavity resonator of communication system requirement.
The purpose of this utility model can be by taking following technical scheme to reach:
A broadband filter that adopts single chamber four mould cavity resonator, is characterized in that: comprise cavity, the first port, the second port, the first perturbation metallic object and the second perturbation metallic object; Described the first perturbation metallic object and the second perturbation metallic object are arranged on the bottom in cavity, the center that cavity is all departed from the center of the first perturbation metallic object and the second perturbation metallic object, and the first perturbation metallic object and the second perturbation metallic object centered by the longitudinal centre line of cavity symmetrically; Described the first port and the second port are arranged on cavity, and run through chamber outer wall and inwall; Described the first port is provided with the first conductor assembly, and described the second port is provided with the second conductor assembly, and the axis of the axis of described the first conductor assembly and the second conductor assembly is perpendicular, and respectively perpendicular to the longitudinal centre line of cavity.
As a kind of preferred version, described the first conductor assembly is welded to form by the first coaxial inner conductor and the first coaxial outer conductor, and described the second conductor assembly is welded to form by the second coaxial inner conductor and the second coaxial outer conductor; Described the first coaxial inner conductor puts in cavity from the first port, and described the first coaxial outer conductor is fixed on the chamber outer wall of the first port; Described the second coaxial inner conductor puts in cavity from the second port, and described the second coaxial outer conductor is fixed on the chamber outer wall of the second port.
As a kind of preferred version, described the first coaxial inner conductor and the second coaxial inner conductor all adopt coupling bar, and described the first coaxial outer conductor and the second coaxial outer conductor all adopt sub-miniature A connector, the end of described sub-miniature A connector and coupling bar welding.
As a kind of preferred version, described each sub-miniature A connector is provided with four through holes, described cavity has four screwed holes corresponding with the through hole of sub-miniature A connector near the position the first port and the second port, and described each sub-miniature A connector is fixed on chamber outer wall with four screwed holes through after four through holes by four screws.
As a kind of preferred version, the bottom surface of described the first perturbation metallic object is provided with the first perturbation metallic object and forms the holistic first fix/tuning screw, and the bottom surface of described the second perturbation metallic object is provided with the second perturbation metallic object and forms the holistic second fix/tuning screw; Described the first perturbation metallic object is arranged on the bottom in cavity by the first fix/tuning screw, and described the second perturbation metallic object is arranged on the bottom in cavity by the second fix/tuning screw.
As a kind of preferred version, the described first fix/tuning screw is arranged on the place of bottom center of the first perturbation metallic object; The described second fix/tuning screw is arranged on the place of bottom center of the second perturbation metallic object.
As a kind of preferred version, described cavity is rectangular cavity or cylindrical cavity; When described cavity is rectangular cavity, described the first port and the second port are separately positioned on except end face and bottom surface any two orthogonal of cavity.
As a kind of preferred version, described the first perturbation metallic object and the second perturbation metallic object be shaped as cylinder or cuboid.
The utility model has following beneficial effect with respect to prior art:
What 1, filter of the present utility model adopted is this simple perturbation tuning structure of cavity bias internal metallic object, two perturbation metallic objects are specifically set in cavity, and make the center of two perturbation metallic objects all depart from the center of cavity, make two perturbation metallic objects in cavity, form four mould resonators of skew, separate degenerate mode thereby realize, there is high selectivity, high Q value, design and process simple feature, and there is wider fractional bandwidth, can be good at meeting the requirement of miniaturization communication.
2, filter of the present utility model has four obvious resonance points in the scope of 2.75GHz～3.78GHz, visible is the broadband filter that adopts single chamber four mould resonators, has overcome existing filter and has adopted single chamber singlemode resonance device to produce difficult problem existing zero point.
3, filter of the present utility model need not be processed any corner cut or fluting, and handling ease has solved the problem of the narrow processed complex of bandwidth of cavity filter, and simple in structure, applied range.
Brief description of the drawings
Fig. 1 a adopts prior art the first to separate resonator (resonator the is cuboid) structure chart of degenerate mode method.
Fig. 1 b adopts prior art the first to separate resonator (resonator the is cylinder) structure chart of degenerate mode method.
Fig. 2 a adopts prior art the second to separate the resonator stereogram of degenerate mode method.
Fig. 2 b adopts prior art the second to separate the resonator vertical view of degenerate mode method.
Fig. 3 a is the resonator stereogram that adopts the third separation degenerate mode method of prior art.
Fig. 3 b is the resonator vertical view that adopts the third separation degenerate mode method of prior art.
Fig. 4 a is the single chamber four mould narrow band filter structure charts that separate degenerate mode in prior art by coupling screw.
Fig. 4 b is the single chamber four mould narrow band filter simulation result figure that separate degenerate mode in prior art by coupling screw.
Fig. 5 a is the structure chart that prior art separates four mould narrow band filters of the coaxial cavity of degenerate mode.
Fig. 5 b is the simulation result figure that prior art separates four mould narrow band filters of the coaxial cavity of degenerate mode.
Fig. 6 is the filter front view of the utility model embodiment 1.
Fig. 7 is the filter vertical view of the utility model embodiment 1.
Fig. 8 is the Facad structure schematic diagram that the filter of the utility model embodiment 1 is not installed conductor assembly.
Fig. 9 is the right flank structural representation that the filter of the utility model embodiment 1 is not installed conductor assembly.
Figure 10 does not output the cavity of port and the position relationship stereogram of two perturbation metallic objects in the filter of the utility model embodiment 1.
Figure 11 is sub-miniature A connector Facad structure schematic diagram in the filter of the utility model embodiment 1.
Figure 12 is sub-miniature A connector side structure schematic diagram in the filter of the utility model embodiment 1.
Figure 13 is the Electromagnetic Simulation curve chart of the filter freguency response of the utility model embodiment 1.
Upper cavity schematic diagram when Figure 14 is the filter of processing the utility model embodiment 1.
Closed base plate schematic diagram when Figure 15 is the filter of processing the utility model embodiment 1.
Figure 16 is the filter vertical view of the utility model embodiment 2.
Figure 17 is the filter vertical view of the utility model embodiment 3.
Figure 18 is the filter vertical view of the utility model embodiment 4.
Wherein, 1-cavity, 2-the first port, 3-the second port, 4-the first perturbation metallic object, 5-the second perturbation metallic object, 6-the first fix/tuning screw, 7-the second fix/tuning screw, 8-the first coaxial inner conductor, 9-the first coaxial outer conductor, 10-the second coaxial inner conductor, 11-the second coaxial outer conductor, 12-through hole, 13-screwed hole, 14-screw, 15-end, 16-location hole, 17-the first fix/tuning screwed hole, 18-the second fix/tuning screwed hole.
Embodiment
Embodiment 1:
As shown in Fig. 6～Figure 10 (wherein, for embodying the difference of Fig. 8 and Fig. 9, the part that two perturbation metallic objects are not blocked represents with solid line), the filter of the present embodiment comprises cavity 1, the first port 2, the second port 3, the first perturbation metallic object 4 and the second perturbation metallic object 5; Described cavity 1 is cylindrical cavity, described the first perturbation metallic object 4 and the second perturbation metallic object 5 be shaped as cylinder, described the first port 2 and the second port 3 both can be used as input port, can be used as again output port;
The bottom surface of described the first perturbation metallic object 4 is provided with the first perturbation metallic object 4 and forms the holistic first fix/tuning screw 6, and the bottom surface of described the second perturbation metallic object 5 is provided with the second perturbation metallic object 5 and forms the holistic second fix/tuning screw 7; Described the first perturbation metallic object 4 is arranged on the bottom in cavity 1 by the first fix/tuning screw 6, described the second perturbation metallic object 5 is arranged on the bottom in cavity 1 by second fixing/tuning screw 7, and the first perturbation metallic object 4 and the second perturbation metallic object 5 center of all departing from cavity 1; Described the first port 2 is arranged on the front of cavity 1, and the second port 3 is arranged on the right flank of cavity 1, and the first port 2 and the second port 3 all have a segment distance apart from end face and the bottom surface of cavity 1, and the first port 2 and the second port 3 all run through cavity 1 outer wall and inwall; Described the first port 2 places are provided with the first conductor assembly, described the second port 3 places are provided with the second conductor assembly, described the first conductor assembly and the second conductor assembly are all used for signal transmission, described the first conductor assembly is welded to form by the first coaxial inner conductor 8 and the first coaxial outer conductor 9, and described the second conductor assembly is welded to form by the second coaxial inner conductor 10 and the second coaxial outer conductor 11; Described the first coaxial inner conductor 8 puts in cavity 1 from the first port 2, and described the first coaxial outer conductor 9 is fixed on cavity 1 outer wall at the first port 2 places; Described the second coaxial inner conductor 10 puts in cavity 1 from the second port 3, and described the second coaxial outer conductor 11 is fixed on cavity 1 outer wall at the second port 3 places; The axis (establishing place reference axis is z axle) of described the first conductor assembly and the axis (establishing place reference axis is x axle) of the second conductor assembly are perpendicular, and respectively perpendicular to the longitudinal centre line (establishing place reference axis is y axle) of cavity 1, from the vertical view of Fig. 7, can see, the center of circle of the first perturbation metallic object 4 end faces is with respect to the central point of cavity 1 end face, be offset dx along x direction of principal axis, edge-z direction of principal axis has been offset dz; The center of circle of the second perturbation metallic object 5 end faces is with respect to the central point of cavity 1 end face, and edge-x direction of principal axis has been offset dx, has been offset dz along z direction of principal axis; As can be seen here, the first perturbation metallic object 4 and the second perturbation metallic object 5 are symmetrical centered by the longitudinal centre line of cavity 1;
Described the first coaxial inner conductor 8 and the second coaxial inner conductor 10 all adopt coupling bar, described the first coaxial outer conductor 9 and the second coaxial outer conductor 11 all adopt sub-miniature A connector, the structure of each sub-miniature A connector as shown in FIG. 11 and 12, each sub-miniature A connector is provided with four through holes 12, described cavity 1 has four screwed holes 13 corresponding with the through hole 12 of sub-miniature A connector near the position the first port 2 and the second port 3, each sub-miniature A connector is fixed on the outer wall of cavity 1 with four screwed holes 13 through four through holes 12 are rear by four screws 14, the end 15 of sub-miniature A connector and coupling bar welding.
As shown in figure 13, in figure, dotted line represents the Electromagnetic Simulation curve of the filter freguency response of the present embodiment | S
11|, be the return loss of input port; Solid line represents | S
21|, be the forward transmission coefficient of input port to output port, can see in the scope of 2.75GHz～3.78GHz, | S
11| value all-below 15dB, and have four obvious resonance points (i.e. the first perturbation metallic object 4 and the second perturbation metallic object 5 cavity 1 is interior formed four mould resonators).
The filter course of processing of the present embodiment is as follows:
Get a cuboid, bottommost is cut, the bottommost cutting is closed base plate, dig out a cylindrical cavity in remaining part of not cutting, make this part form upper cavity, upper cavity and closed base plate are respectively as shown in FIG. 14 and 15, process in conjunction with Fig. 6～Fig. 8 again, output separately a mouth in upper cavity front portion and right part, respectively as the first port 2 and the second port 3, on near the position the first port 2 and the second port 3, output respectively four screwed holes 13 corresponding with the through hole 12 of sub-miniature A connector, on the position of not digging in upper cavity bottom, output four location holes 16 corresponding with pin, on closed base plate, output four location holes 16 and two fixing/tuning screwed holes (being respectively the first fix/tuning screwed hole 17 and the second fix/tuning screwed hole 18), the diameter of the location hole 16 on closed base plate is identical with the diameter of the location hole 16 of upper cavity bottom, the first fix/tuning screw 6 of the first perturbation metallic object 4 bottom surfaces matches with the first fix/tuning screwed hole 17, the second fix/tuning screw 7 of the second perturbation metallic object 5 bottom surfaces matches with the second fix/tuning screwed hole 18, the first perturbation metallic object 4 and the second perturbation metallic object 5 are arranged on closed base plate, by after two sub-miniature A connectors and two coupling bar welding, be separately fixed at the first port 2 and the second port 3 places, by pin, upper cavity and closed base plate are fixed again.
Embodiment 2:
The main feature of the present embodiment is: as shown in figure 16, described cavity 1 is rectangular cavity, described the first perturbation metallic object 4 and the second perturbation metallic object 5 be shaped as cylinder; Described the first port 2 and the second port 3 can be separately positioned on cavity 1 except end face and bottom surface any two orthogonal upper (in the present embodiment, the first port 2 is arranged on the front of cavity 1, the second port 3 is arranged on the right flank of cavity 1, and the first port 2 and the second port 3 all have a segment distance apart from end face and the bottom surface of cavity 1); And the course of processing is to get a cuboid equally, bottommost is cut, the bottommost of incision is closed base plate, digs out a rectangular cavity in remaining part of not cutting, and makes this part form upper cavity.All the other are with embodiment 1.
Embodiment 3:
The main feature of the present embodiment is: as shown in figure 17, described cavity 1 is cylindrical cavity, described the first perturbation metallic object 4 and the second perturbation metallic object 5 be shaped as cuboid.All the other are with embodiment 1 or 2.
Embodiment 4:
The main feature of the present embodiment is: as shown in figure 18, described cavity 1 is rectangular cavity, described the first perturbation metallic object 4 and the second perturbation metallic object 5 be shaped as cuboid.All the other are with embodiment 1 or 2.
In above-described embodiment 1～4, the metal material that described cavity 1, the first perturbation metallic object 4, the second perturbation metallic object 5, the first conductor assembly and the second conductor assembly adopt can be any one of aluminium, iron, tin, copper, silver, gold and platinum, can be maybe any one alloy of aluminium, iron, tin, copper, silver, gold and platinum.
The above; it is only the utility model patent preferred embodiment; but the protection range of the utility model patent is not limited to this; anyly be familiar with those skilled in the art in the disclosed scope of the utility model patent; be equal to replacement or changed according to the technical scheme of the utility model patent and utility model design thereof, all being belonged to the protection range of the utility model patent.
Claims (8)
1. a broadband filter that adopts single chamber four mould cavity resonator, is characterized in that: comprise cavity, the first port, the second port, the first perturbation metallic object and the second perturbation metallic object; Described the first perturbation metallic object and the second perturbation metallic object are arranged on the bottom in cavity, the center that cavity is all departed from the center of the first perturbation metallic object and the second perturbation metallic object, and the first perturbation metallic object and the second perturbation metallic object centered by the longitudinal centre line of cavity symmetrically; Described the first port and the second port are arranged on cavity, and run through chamber outer wall and inwall; Described the first port is provided with the first conductor assembly, and described the second port is provided with the second conductor assembly, and the axis of the axis of described the first conductor assembly and the second conductor assembly is perpendicular, and respectively perpendicular to the longitudinal centre line of cavity.
2. a kind of broadband filter that adopts single chamber four mould cavity resonator according to claim 1, it is characterized in that: described the first conductor assembly is welded to form by the first coaxial inner conductor and the first coaxial outer conductor, described the second conductor assembly is welded to form by the second coaxial inner conductor and the second coaxial outer conductor; Described the first coaxial inner conductor puts in cavity from the first port, and described the first coaxial outer conductor is fixed on the chamber outer wall of the first port; Described the second coaxial inner conductor puts in cavity from the second port, and described the second coaxial outer conductor is fixed on the chamber outer wall of the second port.
3. a kind of broadband filter that adopts single chamber four mould cavity resonator according to claim 2, it is characterized in that: described the first coaxial inner conductor and the second coaxial inner conductor all adopt coupling bar, described the first coaxial outer conductor and the second coaxial outer conductor all adopt sub-miniature A connector, the end of described sub-miniature A connector and coupling bar welding.
4. a kind of broadband filter that adopts single chamber four mould cavity resonator according to claim 3, it is characterized in that: described each sub-miniature A connector is provided with four through holes, described cavity has four screwed holes corresponding with the through hole of sub-miniature A connector near the position the first port and the second port, and described each sub-miniature A connector is fixed on chamber outer wall with four screwed holes through after four through holes by four screws.
5. a kind of broadband filter that adopts single chamber four mould cavity resonator according to claim 1, it is characterized in that: the bottom surface of described the first perturbation metallic object is provided with the first perturbation metallic object and forms the holistic first fix/tuning screw, the bottom surface of described the second perturbation metallic object is provided with the second perturbation metallic object and forms the holistic second fix/tuning screw; Described the first perturbation metallic object is arranged on the bottom in cavity by the first fix/tuning screw, and described the second perturbation metallic object is arranged on the bottom in cavity by the second fix/tuning screw.
6. a kind of broadband filter that adopts single chamber four mould cavity resonator according to claim 5, is characterized in that: the described first fix/tuning screw is arranged on the place of bottom center of the first perturbation metallic object; The described second fix/tuning screw is arranged on the place of bottom center of the second perturbation metallic object.
7. a kind of broadband filter that adopts single chamber four mould cavity resonator according to claim 1, is characterized in that: described cavity is rectangular cavity or cylindrical cavity; When described cavity is rectangular cavity, described the first port and the second port are separately positioned on except end face and bottom surface any two orthogonal of cavity.
8. a kind of broadband filter that adopts single chamber four mould cavity resonator according to claim 1, is characterized in that: described the first perturbation metallic object and the second perturbation metallic object be shaped as cylinder or cuboid.
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| CN201420330375.XU CN203983432U (en) | 2014-06-19 | 2014-06-19 | A kind of broadband filter that adopts single chamber four mould cavity resonator |
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| CN201420330375.XU CN203983432U (en) | 2014-06-19 | 2014-06-19 | A kind of broadband filter that adopts single chamber four mould cavity resonator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104091985A (en) * | 2014-06-19 | 2014-10-08 | 华南理工大学 | Broadband filter with single-cavity four-mode cavity resonator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104091985A (en) * | 2014-06-19 | 2014-10-08 | 华南理工大学 | Broadband filter with single-cavity four-mode cavity resonator |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20170619 |