CN104091985B - A kind of broadband filter adopting single chamber four mould cavity resonator - Google Patents
A kind of broadband filter adopting single chamber four mould cavity resonator Download PDFInfo
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- CN104091985B CN104091985B CN201410277517.5A CN201410277517A CN104091985B CN 104091985 B CN104091985 B CN 104091985B CN 201410277517 A CN201410277517 A CN 201410277517A CN 104091985 B CN104091985 B CN 104091985B
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Abstract
The invention discloses a kind of broadband filter adopting single chamber four mould cavity resonator, including cavity, the first port, the second port, the first perturbation metallic object and the second perturbation metallic object；Described first perturbation metallic object and the second perturbation metallic object are arranged on the bottom in cavity, the center of cavity is all deviateed at 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 are symmetrical centered by the longitudinal centre line of cavity；Described first port and the second port are arranged on cavity, and through cavities outer wall and inwall；Described first port is provided with the first conductor assembly, and described second port is provided with the second conductor assembly, the axis of described first conductor assembly and the axis perpendicular of the second conductor assembly, and is respectively perpendicular to the longitudinal centre line of cavity。The present invention has the simple feature of high selectivity, high q-factor, design and processing, and has relatively wide fractional bandwidth, it is possible to well meet the requirement of miniaturization communication。
Description
Technical field
The present invention relates to a kind of wave filter, especially a kind of broadband filter adopting single chamber four mould cavity resonator, belong to wireless communication field。
Background technology
In present mobile communication technology, microwave radio device has become requisite important component part。Wave 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 compact portability requires that filter unit realizes desired properties index in less space。
For the demand, wave-guide cavity wave multi-mode filter has lot of advantages: first, high q-factor；Second, high power capacity；3rd, wave-guide cavity wave multi-mode filter can be achieved with the filtering characteristic that the several chambeies needed for single mode could realize in a cavity, and therefore, this advantage of miniaturization appears undoubtedly。This three big feature ensure that the miniaturization of wave filter and high performance requirement。We can not ignore medium multi-mode filter in product development, manufacture simultaneously; especially there is lot of challenges in the realization of large-scale production; mainly problems with: one; the parasitic couplings of higher mode product complexity is very big for holotype impact, substantially increases the complexity that emulation is especially debugged。This requires that treating higher mode by its inherent character, must cut down negative effect, strengthens effectively utilizing；They are two years old, complicated tunable coupled structure, common cavity multimode tuning structure is screw, and adopt in the problem separating degenerate mode corner cut and with the electric field methods adding coupling screws at 45 ° two polarization, like this difficulty of processing improves, thus improve processing cost。
According to investigations with understanding, disclosed prior art is as follows:
1) the separation degenerate mode of resonator generally has three kinds of method: a, as seen in figure la and lb, when realizing degenerate mode coupling by coupling screws, in order to avoid interacting, its position should be positioned near the electric field intensity maximum of two resonance (coupling), and all the other degenerate mode electric fields are the region of zero, the electric field of usual coupling screws and two polarization is at 45 °, but this coupled modes tunable range is smaller；B, as shown in figures 2 a and 2b, puts in coupling screws, equally possible separation degenerate mode above resonator 45° angle；C, as best shown in figures 3 a and 3b, cuts a rectangle corner cut, but this coupled modes is not easily processed。
2) 1987, the scholars such as R.R.Bonetti deliver at IEEEMTT-Sdigest and are entitled as in " Quadruple-modeFilters " article, it is proposed by coupling screws separation degenerate mode, structure chart is as shown in fig. 4 a, and realize single chamber four mould narrow band filter, if Fig. 4 b is the simulation result of this Structure Filter。From simulation result it can be seen that this wave filter functional, but structure processing is relatively complicated。
3) in October, 2011, open dragon scholar in " Microwave Coaxial Dielectric Filter research " article, propose a kind of dielectric filter, as shown in Figure 5 a, and at HFSS electromagnetic simulation software modeling analysis, achieving four modular belt bandpass filters, simulation result figure is as shown in Figure 5 b。But this complicated structure, and can be seen that there is no transmission zero band from simulation result, Out-of-band rejection is poor。
Summary of the invention
The invention aims to solve the defect of above-mentioned prior art, provide and a kind of there is simple in construction, handling ease, advantage that performance is good, and there is relatively wide fractional bandwidth, it is possible to meet the broadband filter adopting single chamber four mould cavity resonator of communication system requirements。
The purpose of the present invention can be passed through to adopt the following technical scheme that and reach:
A kind of broadband filter adopting single chamber four mould cavity resonator, it is characterised in that: include cavity, the first port, the second port, the first perturbation metallic object and the second perturbation metallic object；Described first perturbation metallic object and the second perturbation metallic object are arranged on the bottom in cavity, the center of cavity is all deviateed at 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 are symmetrical centered by the longitudinal centre line of cavity；Described first port and the second port are arranged on cavity, and through cavities outer wall and inwall；Described first port is provided with the first conductor assembly, and described second port is provided with the second conductor assembly, the axis of described first conductor assembly and the axis perpendicular of the second conductor assembly, and is respectively perpendicular to the longitudinal centre line of cavity。
As a kind of preferred version, described first conductor assembly is welded to form by the first coaxial inner conductor and the first coaxial outer conductor, and described second conductor assembly is welded to form by the second coaxial inner conductor and the second coaxial outer conductor；Described first coaxial inner conductor puts in cavity from the first port, and described first coaxial outer conductor is fixed on the chamber outer wall of the first port；Described second coaxial inner conductor puts in cavity from the second port, and described second coaxial outer conductor is fixed on the chamber outer wall of the second port。
As a kind of preferred version, described first coaxial inner conductor and the second coaxial inner conductor all adopt coupling bar, and described first coaxial outer conductor and the second coaxial outer conductor all adopt sub-miniature A connector, and the end of described sub-miniature A connector welds with coupling bar。
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 on the position of the first port and the second near ports, and described each sub-miniature A connector is fixed on chamber outer wall by coordinating with four screwed holes after four screws four through holes of traverse。
As a kind of preferred version, the bottom surface of described first perturbation metallic object is provided with/tuning screw fixing with the first perturbation metallic object composition holistic first, and the bottom surface of described second perturbation metallic object is provided with/tuning screw fixing with the second perturbation metallic object composition holistic second；Described first perturbation metallic object is arranged on the bottom in cavity by first fixing/tuning screw, described second perturbation metallic object by second fixing/tuning screw is arranged on the bottom in cavity。
As a kind of preferred version, described first fixing/tuning screw is arranged on the place of bottom center of the first perturbation metallic object；Described second fixing/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 first port and the second port are separately positioned in orthogonal of cavity any two except end face and bottom surface。
It is shaped as cylinder or cuboid as a kind of preferred version, described first perturbation metallic object and the second perturbation metallic object。
The present invention has following beneficial effect relative to prior art:
What 1, the wave filter of the present invention 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 deviate the center of cavity, two perturbation metallic objects are made to form four mould resonators of skew in cavity, thus realizing separating degenerate mode, there is the simple feature of high selectivity, high q-factor, design and processing, and there is relatively wide fractional bandwidth, it is possible to well meet the requirement of miniaturization communication。
2, the wave filter of the present invention has four obvious resonance points in the scope of 2.75GHz～3.78GHz, it is seen that be the broadband filter adopting single chamber four mould resonator, overcomes existing wave filter and adopts the zero point existing for the singlemode resonance device of single chamber to produce difficult problem。
3, the wave filter of the present invention need not process any corner cut or fluting, handling ease, the problem solving the narrow processed complex of bandwidth of cavity filter, and simple in construction, applied range。
Accompanying drawing explanation
Fig. 1 a is resonator (resonator the is cuboid) structure chart adopting the first separation degenerate mode method of prior art。
Fig. 1 b is resonator (resonator the is cylinder) structure chart adopting the first separation degenerate mode method of prior art。
Fig. 2 a is the resonator axonometric chart adopting prior art the second separation degenerate mode method。
Fig. 2 b is the resonator top view adopting prior art the second separation degenerate mode method。
Fig. 3 a is the resonator axonometric chart adopting the third separation degenerate mode method of prior art。
Fig. 3 b is the resonator top view adopting the third separation degenerate mode method of prior art。
Fig. 4 a is by single chamber four mould narrow band filter structure chart of coupling screws separation degenerate mode in prior art。
Fig. 4 b is by single chamber four mould narrow band filter simulation result figure of coupling screws separation degenerate mode in prior art。
Fig. 5 a is the structure chart of four mould narrow band filters of the coaxial cavity of prior art separation degenerate mode。
Fig. 5 b is the simulation result figure of four mould narrow band filters of the coaxial cavity of prior art separation degenerate mode。
Fig. 6 is the wave filter front view of the embodiment of the present invention 1。
Fig. 7 is the wave filter top view of the embodiment of the present invention 1。
Fig. 8 is the Facad structure schematic diagram that conductor assembly do not installed by the wave filter of the embodiment of the present invention 1。
Fig. 9 is the right flank structural representation that conductor assembly do not installed by the wave filter of the embodiment of the present invention 1。
Figure 10 be the embodiment of the present invention 1 wave filter in do not output the cavity of port and the position relationship axonometric chart of two perturbation metallic objects。
Figure 11 be the embodiment of the present invention 1 wave filter in sub-miniature A connector Facad structure schematic diagram。
Figure 12 be the embodiment of the present invention 1 wave filter in sub-miniature A connector side structure schematic diagram。
Figure 13 is the Electromagnetic Simulation curve chart of the filter freguency response of the embodiment of the present invention 1。
Figure 14 is the upper cavity schematic diagram during wave filter of the processing embodiment of the present invention 1。
Figure 15 is the closed base plate schematic diagram during wave filter of the processing embodiment of the present invention 1。
Figure 16 is the wave filter top view of the embodiment of the present invention 2。
Figure 17 is the wave filter top view of the embodiment of the present invention 3。
Figure 18 is the wave filter top view of the embodiment of the present invention 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-first fixes/tuning screw, 7-second fixes/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-positions hole, and 17-first fixes/tuning screwed hole, and 18-second fixes/tuning screwed hole。
Detailed description of the invention
Embodiment 1:
As shown in Fig. 6～Figure 10 (wherein, for embodying the difference of Fig. 8 and Fig. 9, the part do not blocked by two perturbation metallic objects is indicated by the solid line), the wave filter of the present embodiment includes cavity the 1, first port the 2, second port the 3, first perturbation metallic object 4 and the second perturbation metallic object 5；Described cavity 1 is cylindrical cavity, described first perturbation metallic object 4 and the second perturbation metallic object 5 be shaped as cylinder, described first port 2 and the second port 3 both can as input ports, again can as output port；
The bottom surface of described first perturbation metallic object 4 is provided with and constitutes holistic first fixing/tuning screw 6 with the first perturbation metallic object 4, and the bottom surface of described second perturbation metallic object 5 is provided with and constitutes holistic second fixing/tuning screw 7 with the second perturbation metallic object 5；Described first perturbation metallic object 4 is arranged on the bottom in cavity 1 by first fixing/tuning screw 6, described 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 all deviate the center of cavity 1；Described 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 there is a segment distance the first port 2 and the second port 3 all end faces from cavity 1 and bottom surface, the first port 2 and the second equal through cavities 1 outer wall of port 3 and inwall；Described first port 2 place is provided with the first conductor assembly, described second port 3 place is provided with the second conductor assembly, described first conductor assembly and the second conductor assembly are all used for transmitting signal, described first conductor assembly is welded to form by the first coaxial inner conductor 8 and the first coaxial outer conductor 9, and described second conductor assembly is welded to form by the second coaxial inner conductor 10 and the second coaxial outer conductor 11；Described first coaxial inner conductor 8 puts in cavity 1 from the first port 2, and described first coaxial outer conductor 9 is fixed on cavity 1 outer wall at the first port 2 place；Described second coaxial inner conductor 10 puts in cavity 1 from the second port 3, and described second coaxial outer conductor 11 is fixed on cavity 1 outer wall at the second port 3 place；The axis (setting place coordinate axes as z-axis) of described first conductor assembly and the axis (setting place coordinate axes as x-axis) of the second conductor assembly are perpendicular, and it is respectively perpendicular to the longitudinal centre line (setting place coordinate axes as y-axis) of cavity 1, from the top view of Fig. 7 it can be seen that, the center of circle of the first perturbation metallic object 4 end face is relative to the central point of cavity 1 end face, offset by dx along the x-axis direction, edge-z-axis direction offset by dz；The center of circle of the second perturbation metallic object 5 end face is relative to the central point of cavity 1 end face, and edge-x-axis direction offset by dx, offset by dz along the z-axis direction；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 first coaxial inner conductor 8 and the second coaxial inner conductor 10 all adopt coupling bar, described 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 is 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 on the position near the first port 2 and the second port 3, each sub-miniature A connector coordinates the outer wall that be fixed on cavity 1 on four screwed holes 13 by four screws 14 after four through holes 12, the end 15 of sub-miniature A connector welds with coupling bar。
As shown in figure 13, in figure, dotted line represents the Electromagnetic Simulation curve of the filter freguency response of the present embodiment | S11|, it is the return loss of input port；Solid line represents | S21|, it is the input port forward transmission coefficient to output port, it can be seen that in the scope of 2.75GHz～3.78GHz, | S11| value all at below-15dB, and have four obvious resonance points (namely the first perturbation metallic object 4 and the second perturbation metallic object 5 constitute four mould resonators in cavity 1)。
The wave filter course of processing of the present embodiment is as follows:
Take a cuboid, bottommost is cut, the bottommost cut is closed base plate, a cylindrical cavity is dug out in the remaining part do not cut, this part is made to form upper cavity, upper cavity and closed base plate are respectively as shown in FIG. 14 and 15, it is processed in conjunction with Fig. 6～Fig. 8, and right part anterior at upper cavity each outputs a mouth, respectively as the first port 2 and the second port 3, position near the first port 2 and the second port 3 outputs four screwed holes 13 corresponding with the through hole 12 of sub-miniature A connector respectively, the position do not dug bottom upper cavity is outputed four location holes 16 corresponding with pin, closed base plate is outputed four holes 16, location and two fixing/tuning screwed holes (respectively first fixing/tuning screwed hole 17 and second fixing/tuning screwed hole 18), the diameter in the hole 16, location on closed base plate is identical with the diameter in the hole 16, location bottom upper cavity, the first of first perturbation metallic object 4 bottom surface be fixing/and tuning screw 6 is fixing with first/and tune screwed hole 17 and match, the second of second perturbation metallic object 5 bottom surface be fixing/and tuning screw 7 is fixing with second/and tune screwed hole 18 and match, the first perturbation metallic object 4 and the second perturbation metallic object 5 is made to be arranged on closed base plate, after two sub-miniature A connectors and two coupling bar welding, it is separately fixed at the first port 2 and the second port 3 place, again through pin, upper cavity and closed base plate are fixed。
Embodiment 2:
Being mainly characterized by of the present embodiment: as shown in figure 16, described cavity 1 is rectangular cavity, described first perturbation metallic object 4 and the second perturbation metallic object 5 be shaped as cylinder；It is upper (in the present embodiment that described first port 2 and the second port 3 can be separately positioned on orthogonal of the cavity 1 any two except end face and bottom surface, first port 2 is arranged on the front of cavity 1, second port 3 is arranged on the right flank of cavity 1, and there is a segment distance the first port 2 and the second port 3 all end faces from cavity 1 and bottom surface)；And the course of processing is take a cuboid equally, being cut by bottommost, the bottommost of incision is closed base plate, digs out a rectangular cavity in the remaining part do not cut, and makes this part form upper cavity。All the other are with embodiment 1。
Embodiment 3:
Being mainly characterized by of the present embodiment: as shown in figure 17, described cavity 1 is cylindrical cavity, described 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:
Being mainly characterized by of the present embodiment: as shown in figure 18, described cavity 1 is rectangular cavity, described 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 the 1, first perturbation metallic object the 4, second perturbation metallic object the 5, first conductor assembly and the second conductor assembly adopt can be any one of aluminum, ferrum, stannum, copper, silver, gold and platinum, can be maybe any one alloy of aluminum, ferrum, stannum, copper, silver, gold and platinum。
The above; it is only patent preferred embodiment of the present invention; but the protection domain of patent of the present invention is not limited thereto; any those familiar with the art is in the scope disclosed in patent of the present invention; technical scheme and inventive concept thereof according to patent of the present invention are equal to replacement or are changed, and broadly fall into the protection domain of patent of the present invention。
Claims (8)
1. the broadband filter adopting single chamber four mould cavity resonator, it is characterised in that: include cavity, the first port, the second port, the first perturbation metallic object and the second perturbation metallic object；Described first perturbation metallic object and the second perturbation metallic object are arranged on the bottom in cavity, the center of circle of the first perturbation metallic object end face and the center of circle of the second perturbation metallic object end face have offset on direction in x-axis, z-axis both with respect to the central point of cavity end face, and the first perturbation metallic object and the second perturbation metallic object symmetrical about the longitudinal centre line of cavity；Described first port and the second port are arranged on cavity, and through cavities outer wall and inwall；Described first port is provided with the first conductor assembly, and described second port is provided with the second conductor assembly, the axis of described first conductor assembly and the axis perpendicular of the second conductor assembly, and is respectively perpendicular to the longitudinal centre line of cavity；Wherein, the axis place coordinate axes of described first conductor assembly is z-axis, and the axis place coordinate axes of the second conductor assembly is x-axis, and the longitudinal centre line place coordinate axes of described cavity is y-axis。
2. a kind of broadband filter adopting single chamber four mould cavity resonator according to claim 1, it is characterized in that: described first conductor assembly is welded to form by the first coaxial inner conductor and the first coaxial outer conductor, described second conductor assembly is welded to form by the second coaxial inner conductor and the second coaxial outer conductor；Described first coaxial inner conductor puts in cavity from the first port, and described first coaxial outer conductor is fixed on the chamber outer wall of the first port；Described second coaxial inner conductor puts in cavity from the second port, and described second coaxial outer conductor is fixed on the chamber outer wall of the second port。
3. a kind of broadband filter adopting single chamber four mould cavity resonator according to claim 2, it is characterized in that: described first coaxial inner conductor and the second coaxial inner conductor all adopt coupling bar, described first coaxial outer conductor and the second coaxial outer conductor all adopt sub-miniature A connector, and the end of described sub-miniature A connector welds with coupling bar。
4. a kind of broadband filter adopting 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 on the position of the first port and the second near ports, and described each sub-miniature A connector is fixed on chamber outer wall by coordinating with four screwed holes after four screws four through holes of traverse。
5. a kind of broadband filter adopting single chamber four mould cavity resonator according to claim 1, it is characterized in that: the bottom surface of described first perturbation metallic object is provided with/tuning screw fixing with the first perturbation metallic object composition holistic first, the bottom surface of described second perturbation metallic object is provided with/tuning screw fixing with the second perturbation metallic object composition holistic second；Described first perturbation metallic object is arranged on the bottom in cavity by first fixing/tuning screw, described second perturbation metallic object by second fixing/tuning screw is arranged on the bottom in cavity。
6. a kind of broadband filter adopting single chamber four mould cavity resonator according to claim 5, it is characterised in that: described first fixing/tuning screw is arranged on the place of bottom center of the first perturbation metallic object；Described second fixing/tuning screw is arranged on the place of bottom center of the second perturbation metallic object。
7. a kind of broadband filter adopting single chamber four mould cavity resonator according to claim 1, it is characterised in that: described cavity is rectangular cavity or cylindrical cavity；When described cavity is rectangular cavity, described first port and the second port are separately positioned in orthogonal of cavity any two except end face and bottom surface。
8. a kind of broadband filter adopting single chamber four mould cavity resonator according to claim 1, it is characterised in that: described first perturbation metallic object and the second perturbation metallic object be shaped as cylinder or cuboid。
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| CN104577275B (en) * | 2015-01-16 | 2017-08-25 | 华南理工大学 | The broadband filter of multimode cavity resonator based on coaxial feed probe perturbation |
| CN105789792A (en) * | 2016-03-30 | 2016-07-20 | 华南理工大学 | One-chamber multi-mode metal cylinder chamber filter |
| CN110112521B (en) * | 2019-05-23 | 2023-11-21 | 井冈山大学 | Small four-die cavity dual-band broadband filter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4792771A (en) * | 1986-02-21 | 1988-12-20 | Com Dev Ltd. | Quadruple mode filter |
| EP0632518A1 (en) * | 1993-06-11 | 1995-01-04 | Robert Bosch Gmbh | Line resonator |
| CN101521306A (en) * | 2009-04-09 | 2009-09-02 | 成都赛纳赛德科技有限公司 | Flat transmission multi-mode resonant cavity |
| CN103296343A (en) * | 2012-03-01 | 2013-09-11 | 深圳光启创新技术有限公司 | Filter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4131277B2 (en) * | 2004-01-13 | 2008-08-13 | 株式会社村田製作所 | Multimode dielectric resonator, dielectric filter, and communication device |
| CN203983432U (en) * | 2014-06-19 | 2014-12-03 | 华南理工大学 | A kind of broadband filter that adopts single chamber four mould cavity resonator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4792771A (en) * | 1986-02-21 | 1988-12-20 | Com Dev Ltd. | Quadruple mode filter |
| EP0632518A1 (en) * | 1993-06-11 | 1995-01-04 | Robert Bosch Gmbh | Line resonator |
| CN101521306A (en) * | 2009-04-09 | 2009-09-02 | 成都赛纳赛德科技有限公司 | Flat transmission multi-mode resonant cavity |
| CN103296343A (en) * | 2012-03-01 | 2013-09-11 | 深圳光启创新技术有限公司 | Filter |
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