CN204732507U - The double frequency helical cavity filter that a kind of bandwidth is controlled - Google Patents
The double frequency helical cavity filter that a kind of bandwidth is controlled Download PDFInfo
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- CN204732507U CN204732507U CN201520412450.1U CN201520412450U CN204732507U CN 204732507 U CN204732507 U CN 204732507U CN 201520412450 U CN201520412450 U CN 201520412450U CN 204732507 U CN204732507 U CN 204732507U
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Abstract
The utility model discloses the double frequency helical cavity filter that a kind of bandwidth is controlled, comprise the first resonant cavity, second resonant cavity, coupling window, for the first radio-frequency joint and second radio-frequency joint of input and output port, feeder equipment is provided with in each resonant cavity, helical resonator, for the ground connection base of fixing helical resonator and be connected feeder line for connecting feeder equipment with the coaxial inner conductor of radio-frequency joint, wherein coupling window comprises left half coupling window and right half coupling window, feeder equipment is the rectangle coupling piece of Stepped Impedance structure, helical resonator is the helical resonator of 1/4th resonant cavity wavelength of non-uniform-pitch.This filter achieves the dual frequency characteristics of controllable bandwidth by novel feed structure and coupled structure, there is the features such as controlled, miniaturized, the low dispersion of bandwidth, high selectivity, high power capacity, high q-factor, design and processing is simple, the double frequency filter that this bandwidth is controlled simultaneously, there is comparatively high selectivity, multiple communicating requirement can be met.
Description
Technical field
The utility model relates to the technical field of cavity body filter, the double frequency helical cavity filter that particularly a kind of bandwidth is controlled.
Background technology
Along with the development of data communication and multimedia service demand, particularly to the active demand of multi-modulation scheme and high quality communication, various communication standard and new technology are just constantly suggested, from early stage GSM, CDMA, WCDMA TD-SCDMA, WLAN, WiMAX, UWB, LTE till now.Double frequency wireless communication system arises at the historic moment in this case, and microwave double frequency band-pass filter is the signal processing two wave bands with a two-band unit, and its function is exactly two-frequency signal needed for transmission and suppresses the transmission of unwanted frequency signal.Adopt the two-band filter with the output of single port input single port greatly can reduce system bulk, improve system reliability, realize high quality communication.
In actual industrial production, the most frequently used is cavity body filter, because it has higher power capacity.Coaxial cavity filter is a kind of cavity body filter with minimum dispersion, and the signal thus passed through produces distortion hardly.In numerous kinds of coaxial cavity filters, helical cavity filter because of its undersized feature, and becomes the product having the market competitiveness.But adopting helical cavity, to realize double frequency filter be a large difficult point, the bandwidth of two other passband is controlled is a difficult point during double frequency filter designs always.Due to these two difficult points, the article of the double frequency helical cavity filter also not having bandwidth controlled at present or relevant report.
Such as, 1998, S.J.Fiedziuszko and R.S.Kwok delivers the article being entitled as " Novel helical resonatorfilter structures " on the art top-level meeting " International Microwave Symposium Digest ", spiral coaxial cavity is used to devise a single-frequency two-chamber bimodule band-pass filter, as shown in accompanying drawing 1 (a) and (b).This resonator is that the helical coil of two/wavelength is wound around high dielectric constant, although cavity size can be reduced further on the one hand, be convenient to the fixing of two/wavelength helical wire circle on the other hand, but and the mentality of designing of the unexposed helical resonator about non-uniform-pitch, the simultaneously also not double frequency filter of filter disclosed in this article.
Again such as, 2000, Guangping Zhou delivers the article being entitled as " A non-uniform pitchdual band helix antenna " on the art top-level meeting " Antennas andPropagation Society International Symposium ", shown in following Fig. 2 (a) and (b).It adopts the helical resonator of two kinds of different pitch to devise the dual-band antenna of different frequency ratio, but this filter double frequency helical cavity filter concept that design bandwidth is not controlled.
For another example, number of patent application is 201020585419.5, and patent name is filter disclosed in the controlled module double-frequency micro-strip filter of a kind of bandwidth, and concrete structure is as shown in Fig. 3 (a) and (b).When the second passband work of filter, embedded U-shaped half-wave resonator work, input/output port line is directly connected with U-shaped half-wave resonator, form tap coupler, tap position determines the external sort factor of the second passband, and the coupling gap between resonator determines the coupling coefficient of the second passband.And when the first passband work, U-shaped half-wave resonator not resonance and be regarded as feeder line, loads resonator feed through slot-coupled to short circuit minor matters, its gap determines the external sort factor of the first passband, and short circuit minor matters length determines the coupling coefficient of the first passband.What filter disclosed in this patent adopted is microstrip structure, and the concept of the controlled double frequency filter of the unexposed bandwidth about helical cavity structure.
Utility model content
The purpose of this utility model is that the shortcoming overcoming prior art is with not enough, propose the double frequency helical cavity filter that a kind of bandwidth is controlled, this filter is controlled by adopting non-uniform-pitch structure to achieve dual frequency filter frequency, achieves bandwidth controlled by novel feed structure and novel coupling structure.
The purpose of this utility model is achieved through the following technical solutions:
The double frequency helical cavity filter that a kind of bandwidth is controlled, comprise filter cavity and simultaneously for the first radio-frequency joint 3-a and the second radio-frequency joint 3-b of input and output port, described filter cavity is made up of the first resonant cavity 1-a, the second resonant cavity 1-b and coupling window 5, wherein said coupling window 5 between described first resonant cavity 1-a and described second resonant cavity 1-b, for separating above-mentioned two cavitys;
The first feeder equipment 7-a and the first helical resonator 2-a is mounted with in described first resonant cavity 1-a, wherein said first feeder equipment 7-a connects feeder line 6-a by the first coaxial inner conductor and is connected with the first radio-frequency joint 3-a being arranged on described first resonant cavity 1-a outer wall, and wherein said first helical resonator 2-a is fixed on described first resonant cavity 1-a inwall by the first ground connection base 4-a;
The second feeder equipment 7-b and the second helical resonator 2-b is mounted with in described second resonant cavity 1-b, wherein said second feeder equipment 7-b connects feeder line 6-b by the second coaxial inner conductor and is connected with the second radio-frequency joint 3-b being arranged on described second resonant cavity 1-b outer wall, and wherein said second helical resonator 2-b is fixed on described second resonant cavity 1-b inwall by the second ground connection base 4-b.
Further, described coupling window 5 comprises left half coupling window and right half coupling window, and wherein said left half coupling window comprises first window 10, and wherein said right half coupling window comprises Second Window 11 side by side up and down and the 3rd window 12.
Further, described first window 10, Second Window 11 and the 3rd window 12 are rectangular window.
Further, described first helical resonator 2-a and the second helical resonator 2-b is the quarter-wave helical resonator of place resonant cavity.
Further, described first resonant cavity 1-a and the second resonant cavity 1-b, described first radio-frequency joint 3-a and the second radio-frequency joint 3-b, described first feeder equipment 7-a are connected feeder line 6-a and are connected feeder line 6-b, described first helical resonator 2-a and the second helical resonator 2-b and described first ground connection base 4-a with the second coaxial inner conductor and the second ground connection base 4-b is all arranged with the median plane specular of described coupling window 5 with the second feeder equipment 7-b, described first coaxial inner conductor.
Further, described first feeder equipment 7-a and the second feeder equipment 7-b is the rectangle coupling piece of Stepped Impedance structure;
Wherein said first feeder equipment 7-a comprises and is positioned at described first coaxial inner conductor and connects the first Low ESR rectangle coupling piece 8-a above feeder line 6-a and be positioned at described first coaxial inner conductor and be connected the first high impedance rectangle coupling piece 9-a below feeder line 6-a, and the width of described first high impedance rectangle coupling piece 9-a is less than described first Low ESR rectangle coupling piece 8-a;
Wherein said second feeder equipment 7-b comprises and is positioned at described second coaxial inner conductor and connects the second Low ESR rectangle coupling piece 8-b above feeder line 6-b and be positioned at described second coaxial inner conductor and be connected the second high impedance rectangle coupling piece 9-b below feeder line 6-b, and the width of described second high impedance rectangle coupling piece 9-b is less than described second Low ESR rectangle coupling piece 8-b.
Further, described first helical resonator 2-a and the second helical resonator 2-b is formed by two sections of spiral coils,
Wherein, the pitch of another section of spiral coil is greater than respectively near the pitch of the spiral coil of the first ground connection base 4-a and the second ground connection base 4-b.
Further, described spiral coil is every section of 3 circles.
The utility model has following advantage and effect relative to prior art:
1, helical cavity double frequency filter disclosed in the utility model overcomes existing helical cavity double frequency filter and cannot realize the controlled problem of bandwidth, is achieved the dual frequency characteristics of controllable bandwidth by novel feed structure and coupled structure.
2, the bandwidth that the utility model proposes controlled double frequency helical cavity filter, the shortcoming overcoming prior art, with not enough, has the features such as controlled, miniaturized, the low dispersion of bandwidth, high selectivity, high power capacity, high q-factor, design and processing is simple.
3, the controlled double frequency filter of the bandwidth that the utility model proposes, has comparatively high selectivity, can meet actual multiple communicating requirement.
Accompanying drawing explanation
Fig. 1 (a) is the structure chart of helical cavity resonator in prior art 1;
Fig. 1 (b) is the frequency response of the filter utilizing resonator design in prior art 1;
Fig. 2 (a) is the structure chart of the dual-band antenna adopting non-uniform-pitch structure in prior art 2;
Fig. 2 (b) is the frequency response of the filter utilizing non-uniform-pitch structure dual-band antenna in prior art 2;
Fig. 3 (a) is the structure chart of the controlled double frequency-band microstrip filter of bandwidth in prior art 3;
Fig. 3 (b) is the frequency response of prior art 3 median filter;
Fig. 4 is the three-dimensional structure diagram of the double frequency helical cavity filter that in the present embodiment, bandwidth is controlled;
Fig. 5 is the cutaway view of the double frequency helical cavity filter that in the present embodiment, bandwidth is controlled;
Fig. 6 (a) is the three-dimensional structure diagram of the first feeder equipment in the present embodiment;
Fig. 6 (b) is the end view of the first feeder equipment in the present embodiment;
Fig. 6 (c) is the vertical view of the first feeder equipment in the present embodiment;
Fig. 6 (d) is the front view of the first feeder equipment in the present embodiment;
Fig. 7 is the structure chart of coupling window in the present embodiment;
Fig. 8 is the magnetic chart that the present embodiment median filter is operated in the coupling window plane of low frequency centre frequency;
Fig. 9 is the magnetic chart that the present embodiment median filter is operated in the coupling window plane of high frequency centre frequency;
Figure 10 (a) is insertion loss in the present embodiment median filter | S
21| with W
1variation diagram;
Figure 10 (b) is the first passband return loss in the present embodiment median filter | S
11| with W
1variation diagram;
Figure 10 (c) is the second passband return loss in the present embodiment median filter | S
11| with W
1variation diagram;
Figure 11 (a) is insertion loss in the present embodiment median filter | S
21| with W
2variation diagram;
Figure 11 (b) is the first passband return loss in the present embodiment median filter | S
11| with W
2variation diagram;
Figure 11 (c) is the second passband return loss in the present embodiment median filter | S
11| with W
2variation diagram;
Figure 12 (a) is insertion loss in the present embodiment median filter | S
21| with H
1variation diagram;
Figure 12 (b) is the first passband return loss in the present embodiment median filter | S
11| with H
1variation diagram;
Figure 12 (c) is the second passband return loss in the present embodiment median filter | S
11| with H
1variation diagram;
Figure 13 (a) is insertion loss in the present embodiment median filter | S
21| with H
2variation diagram;
Figure 13 (b) is the first passband return loss in the present embodiment median filter | S
11| with H
2variation diagram;
Figure 13 (c) is the second passband return loss in the present embodiment median filter | S
11| with H
2variation diagram;
Figure 14 is the Electromagnetic Simulation curve chart of filter freguency response disclosed in the present embodiment;
In figure, Reference numeral is: 1-a is the first resonant cavity, 1-b is the second resonant cavity, 2-a is the first helical resonator, 2-b is the second helical resonator, 3-a is the first radio-frequency joint, 3-b is the second radio-frequency joint, 4-a is the first ground connection base, 4-b is the second ground connection base, 5 is coupling window, 6-a is that the first coaxial inner conductor connects feeder line, 6-b is that the second coaxial inner conductor connects feeder line, 7-a is the first feeder equipment, 7-b is the second feeder equipment, 8-a is the first Low ESR rectangle coupling piece, 8-b is the second Low ESR rectangle coupling piece, 9-a is the first high impedance rectangle coupling piece, 9-b is the second high impedance rectangle coupling piece, 10 is first window, 11 is Second Window, 12 is the 3rd window.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, clearly, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Embodiment
Refer to Fig. 4 and Fig. 5, Fig. 4 and Fig. 5 is three-dimensional structure diagram and the cutaway view of the double frequency helical cavity filter that in the present embodiment, bandwidth is controlled respectively.
As shown in the figure, the double frequency helical cavity filter that the disclosed a kind of bandwidth of this enforcement is controlled, comprise filter cavity and simultaneously for the first radio-frequency joint 3-a and the second radio-frequency joint 3-b of input and output port, described filter cavity is made up of the first resonant cavity 1-a, the second resonant cavity 1-b and coupling window 5, wherein coupling window 5 is between the first resonant cavity 1-a and the second resonant cavity 1-b, for separating and connecting above-mentioned two cavitys.
The first feeder equipment 7-a and the first helical resonator 2-a is provided with in first resonant cavity 1-a, wherein the first feeder equipment 7-a is connected with the first radio-frequency joint 3-a being arranged on the first resonant cavity 1-a outer wall by the first coaxial inner conductor connection feeder line 6-a, and wherein the first helical resonator 2-a is fixed on the first resonant cavity 1-a inwall by the first ground connection base 4-a.
The second feeder equipment 7-b and the second helical resonator 2-b is provided with in second resonant cavity 1-b, wherein the second feeder equipment 7-b is connected with the second radio-frequency joint 3-b being arranged on the second resonant cavity 1-b outer wall by the second coaxial inner conductor connection feeder line 6-b, and wherein the second helical resonator 2-b is fixed on described second resonant cavity 1-b inwall by the second ground connection base 4-b.
First radio-frequency joint 3-a and the second radio-frequency joint 3-b is respectively the input/output port of two resonant cavities.First ground connection base 4-a and the second ground connection base 4-b is respectively the base portion of two resonant cavities, and its effect is fixing helical resonator and realizes helical resonator short circuit (connecting the short-circuit end resonant cavity body chamber outer wall of helical resonator).
First resonant cavity 1-a and the second resonant cavity 1-b, the first radio-frequency joint 3-a and the second radio-frequency joint 3-b, the first feeder equipment 7-a be connected with the second feeder equipment 7-b, the first coaxial inner conductor feeder line 6-a be connected with the second coaxial inner conductor feeder line 6-b, the first helical resonator 2-a and the second helical resonator 2-b and the first ground connection base 4-a and the second ground connection base 4-b all centered by coupling window 5 face specular arrange.
Coupling window 5 is the coupling window of connection two resonant cavities.The utility model not only relates to the helical resonator that the first helical resonator 2-a and the second helical resonator 2-b adopts non-uniform-pitch, the particularly novel feed structure of the first feeder equipment 7-a and the second feeder equipment 7-b and the novel coupling window structure of coupling window 5.
In the present embodiment, the centre frequency of two passbands of the double frequency helical cavity filter that bandwidth is controlled is determined by the structure of the first helical resonator 2-a and the second helical resonator 2-b and the size of this part.
In the present embodiment, the bandwidth of two passbands of the double frequency helical cavity filter that bandwidth is controlled then controls primarily of external sort factor Qe and coupling coefficient K.And external sort factor Qe1 and Qe2 of above-mentioned two passbands is determined by the size of the rectangle coupling piece of the novel feed structure (i.e. Stepped Impedance feed structure) of the first feeder equipment 7-a and the second feeder equipment 7-b.And coupling coefficient K1 and K2 of above-mentioned two passbands is determined by the size of coupling window 5.
First feeder equipment 7-a and the second feeder equipment (7-b) are the rectangle coupling piece of Stepped Impedance structure;
Wherein the first feeder equipment 7-a comprises and is positioned at the first coaxial inner conductor and connects the first Low ESR rectangle coupling piece 8-a above feeder line 6-a and be positioned at the first coaxial inner conductor and be connected the first high impedance rectangle coupling piece 9-a below feeder line 6-a, and the width of the first high impedance rectangle coupling piece 9-a is less than the first Low ESR rectangle coupling piece 8-a;
Wherein the second feeder equipment 7-b comprises and is positioned at the second coaxial inner conductor and connects the second Low ESR rectangle coupling piece 8-b above feeder line 6-b and be positioned at the second coaxial inner conductor and be connected the second high impedance rectangle coupling piece 9-b below feeder line 6-b, and the width of the second high impedance rectangle coupling piece 9-b is less than the second Low ESR rectangle coupling piece 8-b.
Fig. 6 (a) is the three-dimensional structure diagram of the first feeder equipment in the present embodiment;
Fig. 6 (b) is the end view of the first feeder equipment in the present embodiment;
Fig. 6 (c) is the vertical view of the first feeder equipment in the present embodiment;
Fig. 6 (d) is the front view of the first feeder equipment in the present embodiment
Fig. 6 (a) to Fig. 6 (d) is respectively the three-dimensional structure diagram of the first feeder equipment 7-a according to the utility model embodiment, end view, vertical view and front view, this feeder equipment is the rectangle coupling piece of Stepped Impedance structure, the first Low ESR rectangle coupling piece 8-a that first coaxial inner conductor connects above feeder line 6-a is Low ESR (physical size is wider) coupling piece, and the first high impedance rectangle coupling piece 9-a of below is high impedance (physical size is narrower) coupling piece.According to the Electric Field Distribution of two patterns, the first Low ESR rectangle coupling piece 8-a length increases, the external sort factor Q of the first passband
e1increase, and the external sort factor Q of the second passband
e2reduce.First high impedance rectangle coupling piece 9-a length increases, and the external sort factor of two passbands all increases.Therefore in the present embodiment, the external sort factor of two passbands of the double frequency helical cavity filter that bandwidth is controlled independently controls by the rectangle coupling piece of this Stepped Impedance structure.
Due to the second feeder equipment 7-b and the first feeder equipment 7-a specular of the utility model embodiment, therefore structure and design principle are identical.
As shown in Figure 7, Fig. 7 is the structure chart of coupling window in the present embodiment, and as can be known from Fig. 7, the coupling window 5 of this structure is made up of left half coupling window and right half coupling window, left half coupling window comprises first window 10, and right half coupling window comprises Second Window 11 and the 3rd window 12 of setting side by side up and down.The size of the first window 10 of left half coupling window is greater than Second Window 11 and the 3rd window 12 of right half coupling window.
According to the Distribution of Magnetic Field of two patterns, the size of two wickets (i.e. Second Window 11 and the 3rd window 12) can control separately the coupling coefficient K of the second passband
2, and substantially do not affect the coupling coefficient K of the first passband
1, large window (i.e. first window 10) then controls the coupling coefficient K of two passbands simultaneously
1and K
2, therefore the coupling coefficient of two passbands independently controls by this coupling window.Therefore, due to two passband external sort factor Q
e1and Q
e2with coupling coefficient K
1and K
2all can independently control, so the bandwidth of two passbands is independent controlled.
The selection of coupling window is mainly determined by the Distribution of Magnetic Field of two pattern (low frequency mode and high frequency mode), because the coupling between coupling window is magnetic coupling.Be the magnetic chart of two patterns at coupling window actinal surface of filter as shown in Figure 8 and Figure 9, the magnetic Field Coupling window side of low frequency mode (basic mode) is face, magnetic field in the same way.And the magnetic Field Coupling window side of high frequency mode (second higher mode) is face, magnetic field incorgruous up and down.
As shown in Figure 7, first window 10 had both been coupled low frequency mode also couples high frequency pattern, and Second Window 11 and the 3rd window 12 couples high frequency patterns and the low frequency mode that is not coupled.
As Figure 10 (a) to Figure 10 (c) is depicted as the width W of frequency response with first window 10 of filter disclosed in the present embodiment
1variation diagram.Wherein can find out the coupling coefficient K of first passband
1substantially constant, and the coupling coefficient K of second passband
2with W
1increase and increase.
The frequency response being depicted as filter disclosed in the present embodiment as Figure 11 (a) to Figure 11 (c) is with the width W of Second Window 11 and the 3rd window 12
2variation diagram.Wherein can find out the coupling coefficient K of first passband
1with the coupling coefficient K of second passband
2with W
2increase and increase.Therefore the coupling coefficient K of two passbands
1and K
2can by W
1and W
2control.
As Figure 12 (a) to Figure 12 (c) is depicted as the frequency response of filter disclosed in the present embodiment with low-impedance coupling rectangular sheet height H
1variation diagram.H
1by 3.3mm to 4.3mm to 5.3mm, the external sort factor Q of passband 1
e1increase gradually, and the external sort factor Q of passband 2
e2reduce gradually.Reason is because when being operated in low frequency pass band, and upper and lower phase place is consistent, therefore H
1larger, Q
e1increase gradually.And when being operated in high frequency pass band, upper and lower phase place is inconsistent, H
1with Q
e2negative correlation, therefore H
1larger, Q
e2reduce gradually.
As Figure 13 (a) to Figure 13 (c) is depicted as the frequency response of filter disclosed in the present embodiment with low-impedance coupling rectangular sheet height H
1variation diagram.H
2by 5.7mm to 4.7mm to 3.7mm, the external sort factor Q of passband 1
e1reduce gradually, the external sort factor Q of passband 2
e2also reduce gradually.Reason is because when being operated in low frequency pass band, and upper and lower phase place is consistent, therefore H
2less, Q
e1reduce gradually.And when being operated in high frequency pass band, upper and lower phase place is inconsistent, H
2with Q
e2positive correlation, therefore H
2less, Q
e2also reduce gradually.
Therefore by H
1and H
2two parameters can control Q
e1and Q
e2.Again due to coupling coefficient K
1and K
2can by W
1and W
2control, therefore the bandwidth of two passbands is controlled.
In actual design, the frequency of passband should be determined by helical resonator structure and size, and the bandwidth of passband is by determining feed structure and size, the structure of coupling window and the adjustment of size.In the present embodiment, given band connection frequency index is f
1=460MHz, f
2=1028MHz, select helical resonator to be the descending two-stage structure of pitch from top to bottom, every section is all 3 circles, and coarse pitch is of a size of 5mm, and small size pitch is 1.5mm, and helical radius is 0.5mm, and helical coil radius is 5mm.The wide * of the high impedance rectangle coupling piece size of Stepped Impedance feed structure is long is 2mm*4.6mm, and the wide * of Low ESR rectangle coupling piece size is long is 4mm*4.1mm.The wide * of the size of large coupling window is long is 3mm*21mm, and the wide * of the size of little coupling window is long is 9mm*9mm.This filter is made of metal, and adopts metallic aluminium to make in this embodiment, and silver-plated on top layer, to reduce loss.
Figure 14 is the Electromagnetic Simulation curve of filter freguency response disclosed in the utility model embodiment.As can be seen from the figure the centre frequency of two passbands is respectively 460MHz and 1028MHz, and frequency ratio is 2.23.The absolute bandwidth of the first passband is 10MHz, and the absolute bandwidth of the second passband is 7MHz.
In sum, the present embodiment proposes the design of the controlled helical cavity double frequency filter of a kind of bandwidth, and this scheme, under less volume, obtains the double frequency filtering characteristic that bandwidth is controlled.Because helical cavity filter has low dispersion, the feature of high power capacity, high q-factor, is applicable to practical application in industry.The utility model can reduce circuit volume and reduce costs while realizing high-performance filtering.This filter novelty is the dual frequency characteristics being achieved controllable bandwidth by novel feed structure and coupled structure.
Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (8)
1. the double frequency helical cavity filter that a bandwidth is controlled, comprise filter cavity and simultaneously for the first radio-frequency joint (3-a) and second radio-frequency joint (3-b) of input and output port, it is characterized in that: described filter cavity is made up of the first resonant cavity (1-a), the second resonant cavity (1-b) and coupling window (5), wherein said coupling window (5) is positioned between described first resonant cavity (1-a) and described second resonant cavity (1-b), for separating above-mentioned two cavitys;
The first feeder equipment (7-a) and the first helical resonator (2-a) is mounted with in described first resonant cavity (1-a), wherein said first feeder equipment (7-a) connects feeder line (6-a) by the first coaxial inner conductor and is connected with the first radio-frequency joint (3-a) being arranged on described first resonant cavity (1-a) outer wall, and wherein said first helical resonator (2-a) is fixed on described first resonant cavity (1-a) inwall by the first ground connection base (4-a);
The second feeder equipment (7-b) and the second helical resonator (2-b) is mounted with in described second resonant cavity (1-b), wherein said second feeder equipment (7-b) connects feeder line (6-b) by the second coaxial inner conductor and is connected with the second radio-frequency joint (3-b) being arranged on described second resonant cavity (1-b) outer wall, and wherein said second helical resonator (2-b) is fixed on described second resonant cavity (1-b) inwall by the second ground connection base (4-b).
2. the double frequency helical cavity filter that a kind of bandwidth according to claim 1 is controlled, it is characterized in that: described coupling window (5) comprises left half coupling window and right half coupling window, wherein said left half coupling window comprises first window (10), and wherein said right half coupling window comprises Second Window (11) side by side up and down and the 3rd window (12).
3. the double frequency helical cavity filter that a kind of bandwidth according to claim 2 is controlled, is characterized in that: described first window (10), Second Window (11) and the 3rd window (12) are rectangular window.
4. the double frequency helical cavity filter that a kind of bandwidth according to claim 1 is controlled, is characterized in that:
Described first helical resonator (2-a) and the second helical resonator (2-b) are the quarter-wave helical resonator of place resonant cavity.
5. the double frequency helical cavity filter controlled according to the arbitrary described a kind of bandwidth of Claims 1-4, is characterized in that:
Described first resonant cavity (1-a) and the second resonant cavity (1-b), described first radio-frequency joint (3-a) and the second radio-frequency joint (3-b), described first feeder equipment (7-a) and the second feeder equipment (7-b), described first coaxial inner conductor connects feeder line (6-a) and is connected feeder line (6-b) with the second coaxial inner conductor, described first helical resonator (2-a) is all arranged with the median plane specular of described coupling window (5) with the second ground connection base (4-b) with the second helical resonator (2-b) and described first ground connection base (4-a).
6. the double frequency helical cavity filter that a kind of bandwidth according to claim 5 is controlled, is characterized in that:
Described first feeder equipment (7-a) and the second feeder equipment (7-b) are the rectangle coupling piece of Stepped Impedance structure;
Wherein said first feeder equipment (7-a) comprises and is positioned at described first coaxial inner conductor and connects the first Low ESR rectangle coupling piece (8-a) of feeder line (6-a) top and be positioned at described first coaxial inner conductor and be connected the first high impedance rectangle coupling piece (9-a) below feeder line (6-a), and the width of described first high impedance rectangle coupling piece (9-a) is less than described first Low ESR rectangle coupling piece (8-a);
Wherein said second feeder equipment (7-b) comprises and is positioned at described second coaxial inner conductor and connects the second Low ESR rectangle coupling piece (8-b) of feeder line (6-b) top and be positioned at described second coaxial inner conductor and be connected the second high impedance rectangle coupling piece (9-b) below feeder line (6-b), and the width of described second high impedance rectangle coupling piece (9-b) is less than described second Low ESR rectangle coupling piece (8-b).
7. the double frequency helical cavity filter that a kind of bandwidth according to claim 5 is controlled, is characterized in that:
Described first helical resonator (2-a) and the second helical resonator (2-b) are formed by two sections of spiral coils,
Wherein, the pitch of another section of spiral coil is greater than respectively near the first ground connection base (4-a) and the pitch of the spiral coil of the second ground connection base (4-b).
8. the double frequency helical cavity filter that a kind of bandwidth according to claim 7 is controlled, is characterized in that:
Described spiral coil is every section of 3 circles.
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| CN201520412450.1U CN204732507U (en) | 2015-06-15 | 2015-06-15 | The double frequency helical cavity filter that a kind of bandwidth is controlled |
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|---|---|---|---|
| CN201520412450.1U CN204732507U (en) | 2015-06-15 | 2015-06-15 | The double frequency helical cavity filter that a kind of bandwidth is controlled |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934669A (en) * | 2015-06-15 | 2015-09-23 | 华南理工大学 | Double-frequency helical cavity filter with controllable bandwidth |
| CN106876848A (en) * | 2017-02-17 | 2017-06-20 | 北京德是和科技有限公司 | A kind of wave filter |
| CN108258371A (en) * | 2018-02-05 | 2018-07-06 | 华南理工大学 | A kind of three mode filter of medium based on capacitive load and aperture coupled |
| CN110137643A (en) * | 2019-05-23 | 2019-08-16 | 井冈山大学 | A kind of controllable big frequency of bandwidth is than coaxial cavity double frequency filter |
| CN115000660A (en) * | 2022-06-06 | 2022-09-02 | 国开启科量子技术(北京)有限公司 | HFSS-based double-helix resonator, design method and voltage amplification device |
-
2015
- 2015-06-15 CN CN201520412450.1U patent/CN204732507U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934669A (en) * | 2015-06-15 | 2015-09-23 | 华南理工大学 | Double-frequency helical cavity filter with controllable bandwidth |
| CN104934669B (en) * | 2015-06-15 | 2018-02-27 | 华南理工大学 | A kind of controllable double frequency spiral cavity filter of bandwidth |
| CN106876848A (en) * | 2017-02-17 | 2017-06-20 | 北京德是和科技有限公司 | A kind of wave filter |
| CN106876848B (en) * | 2017-02-17 | 2019-04-23 | 北京德是和科技有限公司 | A kind of filter |
| CN108258371A (en) * | 2018-02-05 | 2018-07-06 | 华南理工大学 | A kind of three mode filter of medium based on capacitive load and aperture coupled |
| CN108258371B (en) * | 2018-02-05 | 2020-02-18 | 华南理工大学 | Dielectric three-mode filter based on capacitive loading and slotting coupling |
| CN110137643A (en) * | 2019-05-23 | 2019-08-16 | 井冈山大学 | A kind of controllable big frequency of bandwidth is than coaxial cavity double frequency filter |
| CN110137643B (en) * | 2019-05-23 | 2020-12-15 | 井冈山大学 | Large-frequency-ratio coaxial cavity dual-frequency filter with controllable bandwidth |
| CN115000660A (en) * | 2022-06-06 | 2022-09-02 | 国开启科量子技术(北京)有限公司 | HFSS-based double-helix resonator, design method and voltage amplification device |
| CN115000660B (en) * | 2022-06-06 | 2024-02-09 | 国开启科量子技术(北京)有限公司 | HFSS-based double-spiral resonator, design method and voltage amplifying device |
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