CN101276952B - Mixed coupling coaxial cavity filter capable of controlling electromagnetism - Google Patents
Mixed coupling coaxial cavity filter capable of controlling electromagnetism Download PDFInfo
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- CN101276952B CN101276952B CN2008100274491A CN200810027449A CN101276952B CN 101276952 B CN101276952 B CN 101276952B CN 2008100274491 A CN2008100274491 A CN 2008100274491A CN 200810027449 A CN200810027449 A CN 200810027449A CN 101276952 B CN101276952 B CN 101276952B
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Abstract
The invention discloses a controllable electromagnetic mixed coupling coaxial cavity filter, comprising a conductor housing with two or more resonant cavities opened inside, the top of which is sealed by a conductor cover board and which is provided with a through hole; an input/output device penetrates through the through hole on the conductor hosing; bottoms of two or more conductor resonators are fixed to the conductor housing in contact with the guide housing to form short circuit; the conductor cover board opposite to the tope of the conductor resonator is provided with a tuning screw; an electromagnetic mixed coupling control component is arranged between two adjacent guide resonators which need electromagnetic mixed coupling. The invention accomplishes elliptic filter characteristic with a coaxial cavity filter only with main coupling path, which is provided with the following advantage of small volume, low cost, little insertion loss and nonsymmetrical response.
Description
Technical field
The present invention relates to the art of microwave filters field, relate in particular to a kind of coupling coaxial cavity filter with controllable electromagnetic hybrid coupled structure.
Background technology
Coupling coaxial cavity filter is widely used in radio communication base station; Under existing technical conditions, the cavity body filter that only has a main coupling path can only be realized common chebyshev function filter response and the elliptic function filter response that can't realize having transmission zero.At present nearly all elliptic function filter characteristic is all realized by the cross-couplings filter, but traditional cross-couplings filter exists exponent number high, and volume is bigger, the shortcoming that design difficulty is high.
In existing cavity body filter, all only there is the coupling of single controlled electric coupling or magnetic between all adjacent or non-adjacent resonant elements, and do not have controlled electromagnetism hybrid coupled.
Summary of the invention
The objective of the invention is to overcome the problem that existing main coupling filter can't be realized elliptic function filter characteristic; Overcome the existing still bigger problem of cross-couplings filter volume; A kind of the have coupling coaxial cavity filter of controllable electromagnetic hybrid coupled structure and the duplexer that is made up of said controllable electromagnetic hybrid coupled filter are provided, with only having the filter realization elliptic function filter characteristic that main coupling is provided with.
The technical scheme that technical solution problem of the present invention adopts:
This mixed coupling coaxial cavity filter capable of controlling electromagnetism; Comprise conductor shell, have two or more resonant cavitys in the conductor shell, said conductor shell top is by the conductor cover plate for sealing; Said conductor shell has through hole, and input/output device passes the said through hole on the conductor shell; Two or more conductor resonator bottom are fixed in the said conductor shell, and contact the formation short circuit with said conductor shell; With said conductor resonator top over against said conductor cover plate on tuning screw is arranged; Needing to be provided with electromagnetism hybrid coupled control assembly between two adjacent said conductor resonators of electromagnetism hybrid coupled, this electromagnetism hybrid coupled control assembly comprises that the thin bar of conductor, upper surface have dielectric substrate, the tuning screw of conductor patch; Said conductor resonator (4) sidewall has some apertures (8), and the thin bar of said conductor (9) is cylindrical, and two ends embed respectively in the aperture (8) of adjacent two said conductor resonators (4) sidewall; The two ends of said dielectric substrate bottom contact with the top of adjacent two said conductor resonators respectively, and said tuning screw passes said conductor cover plate, and the lower end is stretched in the resonant cavity between two adjacent said conductor resonators.
In order to realize the present invention better, said mixed coupling coaxial cavity filter capable of controlling electromagnetism is characterized in that, said conductor resonator (4) is a hollow cylindrical, and the lateral surface that centers on said hollow cylindrical top is provided with flat-top; The length of said conductor resonator is less than 1/4th of said mixed coupling coaxial cavity filter capable of controlling electromagnetism operation wavelength.
The two ends of said dielectric substrate bottom are bonding with adhesive with the upper surface of adjacent two said conductor resonator top flat-tops respectively, or are screwed.
The sidewall of thin bar of said conductor and said conductor resonator directly welds fixing.
The inner core of the external coaxial cable of said input/output device; Said input/output device is an I/O conductor probe.
Said conductor resonator is fixed in the said conductor shell by holding screw.
Said conductor cover plate is connected by screw with conductor shell.
All conductor material surfaces in the said conductor shell are silver coating.
Compared with prior art, the present invention has following advantage:
1, traditional main coupling cavity fluid filter can only be realized common Chebyshev's filter response; And the present invention can realize the better elliptic function filter of performance through the control to electromagnetism hybrid coupled in the main coupling between the adjacent resonators; Reduced the number of required resonant element; Thereby reduced the volume of filter, reduced production cost.
2, compare with existing cross-couplings filter, the present invention has lower exponent number, littler volume and transmission zero setting more flexibly.Traditional cross-couplings filter needs at least three resonant elements could produce a transmission zero; And the present invention only needs an electromagnetism hybrid coupled filter unit that comprises two resonant elements just can produce a transmission zero.The transmission zero of cross-couplings filter needs global design, and wherein the variation of each transmission zero location all can cause the variation of other transmission zeros; And in the present invention; Each transmission zero all is independently to be created by single controllable electromagnetic hybrid coupled unit; Therefore in the hybrid coupled filter of high-order, single transmission zero changes the variation that can not cause other transmission zero, is easy to realize asymmetrical filter response.
3, the present invention can combine with existing cross-couplings technology, and it is littler to create volume, the elliptic function filter that performance is more superior.
Description of drawings
Fig. 1 is the structural front view of mixed coupling coaxial cavity filter capable of controlling electromagnetism of the present invention.
Fig. 2 is the structural representation of the high-order elliptic function filter that is made up of a plurality of controllable electromagnetic hybrid coupled coaxial cavity filter units.
Fig. 3 is the structural representation of the another kind of high-order elliptic function filter that is made up of a plurality of controllable electromagnetic hybrid coupled coaxial cavity filter units.
Fig. 4 is the fundamental diagram of controllable electromagnetic hybrid coupled structure between the adjacent coaxial resonant cavity in the mixed coupling coaxial cavity filter capable of controlling electromagnetism of the present invention.
Fig. 5 is the Electromagnetic Simulation curve with second order mixed coupling coaxial cavity filter capable of controlling electromagnetism frequency response of a low stopband transmission zero.
Fig. 6 is the Electromagnetic Simulation curve with second order mixed coupling coaxial cavity filter capable of controlling electromagnetism frequency response of a high stopband transmission zero.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail.
The structure of the mixed coupling coaxial cavity filter capable of controlling electromagnetism that the present invention proposes is as shown in Figure 1; Two or more resonant cavitys 2 are arranged in the conductor shell 1; The top of conductor shell 1 is by 3 sealings of conductor cover plate; The place that contacts with conductor shell 1 around the conductor cover plate 3 is fixed by equally distributed metallic screw, and conductor cover plate 3 is detachable so that each parts in the resonant cavity 2 are set.Conductor resonator 4 tops are provided with a circle or the flat-top of other shapes arbitrarily; Len req was shorter when Len req was than common conductor resonator works when making conductor resonator 4 work, and the length of conductor resonator 4 is less than 1/4th of controllable electromagnetic hybrid coupled filter working wavelength; Conductor resonator 4 is a hollow cylindrical, and said flat-top is run through at its top, and the bottom is fixed in the said conductor shell 1 by holding screw 5; Have some apertures 8 on the sidewall of conductor resonator 4.With conductor resonator top over against conductor cover plate 3 be provided with corresponding tuning screw 6, be used to adjust the operating frequency of filter.I/O conductor probe 7 is introduced electromagnetic energy conductor shell 1 and from conductor shell 1, is extracted electromagnetic energy through the through hole on the conductor shell 1, and I/O conductor probe 7 can contact conductor resonator 4, also can not contact conductor resonator 4.When controlled hybrid coupled coupling coaxial cavity filter was worked, the through hole that I/O conductor probe 7 passes on the conductor shell 1 linked to each other through the inner core of jockey with the coaxial cable of conductor shell 1 outside.Needing to be provided with one group of electromagnetism hybrid coupled control assembly between adjacent two conductor resonant cavity devices 4 of electromagnetism hybrid coupled; This assembly comprises a thin bar 9 of columniform conductor; 11, one of the dielectric substrates that upper surface is provided with rectangular conductor paster 10 pass the tuning screw 12 of conductor cover plate 3.The assembly of control electromagnetism hybrid coupled can collaborative work, controls the electromagnetism hybrid coupled between two adjacent conductor resonators 4.Insert respectively in the aperture 8 of adjacent two resonator 4 sidewalls at the two ends of the thin bar 9 of conductor, and the position of the aperture 8 that conductor rods 9 is inserted is high more, and then the position of conductor rods 9 is also just high more, can weld fixing in case of necessity.The two ends of dielectric substrate 11 bottoms contact with the upper surface of adjacent two conductor resonator 4 top flat-tops respectively, and contact-making surface can use adhesive bonding, also can dielectric substrate 11 be fixed on the flat-top at conductor resonator 4 tops with screw.Tuning screw 12 passes conductor cover plate 3, and the lower end is stretched in the resonant cavity 2 between two adjacent conductor resonators 4, is used to finely tune the size of electromagnetic coupled energy between two adjacent resonant cavitys 2.
Two the adjacent resonant cavitys 2, conductor resonator 4 and the corresponding electromagnetism hybrid coupled control assembly thereof that intercouple through the electromagnetism hybrid coupled constitute an independent controllable electromagnetic hybrid coupled filter unit.In a controllable electromagnetic hybrid coupled filter unit, the control method of electromagnetism hybrid coupled is as shown in Figure 4:
When controllable electromagnetic hybrid coupled filter was worked, the electromagnetic field distribution pattern in the resonant cavity 2 was the TEM pattern, and magnetic line of force H distributes around conductor resonator 4 ringwise in the resonant cavity 2.The two ends of conductor rods 9 contact with two adjacent conductor resonators 4; Constituted current loop jointly with conductor resonator 4 resonant cavity 2, according to Faraday's electromagnetic induction law, resonant cavity 2 internal magnetic fields make the outer surface of conductor rods 9 produce induced field current J; The position of conductor rods 9 is high more; The area in this loop is just big more, and the magnetic flux that passes this loop is just big more, and then induced field current J is also just big more; And then the coupling of the magnetic between two resonant cavitys 2 is also just strong more, therefore controls the height of conductor rods 9 and just can control the magnetic stiffness of coupling between adjacent two resonant cavitys 2.When controllable electromagnetic hybrid coupled filter is worked; There is distributed capacitance between the top of conductor resonator 4 and the conductor patch 10; Thereby form the electric coupling between adjacent two resonant cavitys 2; The dielectric constant of the longer or said dielectric substrate 11 of the length of conductor patch 10 is big more, and the electric coupling between two adjacent resonant cavitys 2 is just strong more.Control two electric coupling intensity and magnetic stiffness of couplings between the adjacent resonators simultaneously, just can control transmission zero location that electromagnetism hybrid coupled filter unit produced to realize needed elliptic function filter characteristic.When electric coupling was coupled greater than magnetic, controllable electromagnetic hybrid coupled filter unit can be realized the transmission zero in passband left side, and corresponding Electromagnetic Simulation frequency response curve is as shown in Figure 5; When electric coupling was coupled less than magnetic, controllable electromagnetic hybrid coupled filter unit can be realized the transmission zero on passband right side, and corresponding Electromagnetic Simulation frequency response curve is as shown in Figure 6.
Electromagnetic signal all can produce a transmission zero through any controllable electromagnetic hybrid coupled filter unit, can control the position of this transmission zero through the size of controlling electric coupling energy and magnetic coupling energy respectively.Each controllable electromagnetic hybrid coupled filter unit can work alone and constitute the second order elliptic function filter with single transmission zero; Also can with other controllable electromagnetic hybrid coupled filter unit or resonant element intercouples and collaborative work; Constitute high-order elliptic function filter, like Fig. 2, shown in Figure 3 with a plurality of transmission zeros.
Conductor material surfaces all in the conductor shell 1 is all silver-plated, in all filter part processes of assembling, should wear gloves during operation with the protection silver-plated surface.
Claims (8)
1. mixed coupling coaxial cavity filter capable of controlling electromagnetism; Comprise conductor shell (1); Have two or more resonant cavitys (2) in the conductor shell (1), it is characterized in that, said conductor shell (1) top is sealed by conductor cover plate (3); Said conductor shell (1) has through hole, and input/output device (7) passes the said through hole on the conductor shell (1); Two or more conductor resonators (4) bottom is fixed in the said conductor shell (1), and contacts the formation short circuit with said conductor shell (1); With said conductor resonator (4) top over against said conductor cover plate (3) on tuning screw (6) is arranged; Needing to be provided with electromagnetism hybrid coupled control assembly between adjacent two said conductor resonators (4) of electromagnetism hybrid coupled, this electromagnetism hybrid coupled control assembly comprises that the thin bar of conductor (9), upper surface have dielectric substrate (11), the tuning screw (12) of conductor patch (10); Said conductor resonator (4) sidewall has some apertures (8), and the thin bar of said conductor (9) is cylindrical, and two ends embed respectively in the aperture (8) of adjacent two said conductor resonators (4) sidewall; The two ends of said dielectric substrate (11) bottom contact with the top of adjacent two said conductor resonators (4) respectively, and said tuning screw (12) passes said conductor cover plate (3), and the lower end is stretched in the resonant cavity (2) between adjacent two said conductor resonators (4).
2. according to the said mixed coupling coaxial cavity filter capable of controlling electromagnetism of claim 1, it is characterized in that said conductor resonator (4) is a hollow cylindrical, the lateral surface that centers on said hollow cylindrical top is provided with flat-top; The length of said conductor resonator (4) is less than 1/4th of said mixed coupling coaxial cavity filter capable of controlling electromagnetism operation wavelength.
3. according to the said mixed coupling coaxial cavity filter capable of controlling electromagnetism of claim 2, it is characterized in that the two ends of said dielectric substrate (11) bottom are bonding with adhesive with the upper surface of adjacent two said conductor resonators (4) top flat-top respectively, or are screwed.
4. according to the said mixed coupling coaxial cavity filter capable of controlling electromagnetism of claim 1, it is characterized in that the thin bar of said conductor (9) directly welds fixing with the sidewall of said conductor resonator (4).
5. according to the said mixed coupling coaxial cavity filter capable of controlling electromagnetism of claim 1, it is characterized in that the inner core of the external coaxial cable of said input/output device (7); Said input/output device (7) is an I/O conductor probe.
6. according to the said mixed coupling coaxial cavity filter capable of controlling electromagnetism of claim 1, it is characterized in that said conductor resonator (4) is fixed in the said conductor shell (1) by holding screw (5).
7. according to the said mixed coupling coaxial cavity filter capable of controlling electromagnetism of claim 1, it is characterized in that said conductor cover plate (3) is connected by screw with conductor shell (1).
8. according to the said mixed coupling coaxial cavity filter capable of controlling electromagnetism of claim 1, it is characterized in that all conductor material surfaces are silver coating in the said conductor shell (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100274491A CN101276952B (en) | 2008-04-15 | 2008-04-15 | Mixed coupling coaxial cavity filter capable of controlling electromagnetism |
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| CN2008100274491A CN101276952B (en) | 2008-04-15 | 2008-04-15 | Mixed coupling coaxial cavity filter capable of controlling electromagnetism |
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| CN101276952A CN101276952A (en) | 2008-10-01 |
| CN101276952B true CN101276952B (en) | 2012-08-22 |
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Cited By (1)
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| CN102881969A (en) * | 2011-07-14 | 2013-01-16 | 凯镭思通讯设备（上海）有限公司 | Coaxial cavity filter with changeable resonant frequency |
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2008
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Cited By (2)
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| CN103594767A (en) * | 2013-11-23 | 2014-02-19 | 中国电子科技集团公司第三十八研究所 | Integrated cavity filter |
| CN103594767B (en) * | 2013-11-23 | 2015-10-21 | 中国电子科技集团公司第三十八研究所 | A kind of integrated cavity body filter |
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