CN104934669B - A kind of controllable double frequency spiral cavity filter of bandwidth - Google Patents
A kind of controllable double frequency spiral cavity filter of bandwidth Download PDFInfo
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Abstract
The invention discloses a kind of controllable double frequency spiral cavity filter of bandwidth, including the first resonant cavity, second resonant cavity, coupling window, the first radio-frequency joint and the second radio-frequency joint for input and output port, feeder equipment is provided with each resonant cavity, helical resonator, for fixing the ground connection base of helical resonator and connecting feeder line with the coaxial inner conductor of radio-frequency joint for connecting feeder equipment, wherein coupling window includes 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 a quarter resonator wavelength of non-uniform-pitch.The wave filter realizes the dual frequency characteristics of controllable bandwidth by novel feed structure and coupled structure, have the characteristics that controllable bandwidth, miniaturization, low dispersion, high selectivity, high power capacity, high q-factor, design and processing are simple, the controllable double frequency filter of the bandwidth simultaneously, with compared with high selectivity, a variety of communicating requirements can be met.
Description
Technical field
The present invention relates to the technical field of cavity body filter, the controllable double frequency helical cavity filtering of more particularly to a kind of bandwidth
Device.
Background technology
With data communication and the development of multimedia service demand, particularly multi-standard and the urgent of high quality communication are essential
Ask, various communication standards and new technology are just constantly suggested, from the TD- of GSM, CDMA, WCDMA of early stage till now
SCDMA、WLAN、WiMAX、UWB、LTE.Double frequency wireless communication system arises at the historic moment in this case, the filter of microwave double frequency band-pass
Ripple device is to handle the signal of two wave bands with a double frequency segment unit, and its function is exactly to transmit required two-frequency signal and press down
The transmission of unwanted frequency signal processed.It can be dropped significantly using the two-band wave filter with single port input single port output
Low system bulk, system reliability is improved, realizes high quality communication.
In actual industrial production, most commonly cavity body filter, because it has higher power capacity.Coaxial cavity
Fluid filter is a kind of cavity body filter with minimum dispersion, thus the signal passed through hardly produces distortion.In crowd
In a variety of coaxial cavity filters, the characteristics of spiral cavity filter is because of its small size, and as the product of the great market competitiveness.
But realize that double frequency filter is a big difficult point using helical cavity, the controllable bandwidth of two other passband is always double frequency filter
A difficult point in design.Due to the two difficult points, there is presently no the article of the controllable double frequency spiral cavity filter of bandwidth or
It is relevant report.
Such as 1998, S.J.Fiedziuszko and R.S.Kwok are in the art top-level meeting "
International Microwave Symposium Digest " on deliver entitled " Novel helical resonator
Filter structures " article, a single-frequency two-chamber bimodule band-pass filter is devised using spiral coaxial cavity, it is such as attached
Fig. 1 (a) and (b) are shown.The resonator winds high dielectric constant for the spiral winding of two/wavelength, although on the one hand can
Further to reduce cavity size, on the other hand it is easy to the fixation of two/wavelength helical wire circle, but does not disclose on non-
The mentality of designing of the helical resonator of uniform helical pitch, while the wave filter disclosed in this article is not double frequency filter yet.
Again for example, 2000, Guangping Zhou are in the art top-level meeting " Antennas and
Propagation Society International Symposium " on deliver entitled " A non-uniform pitch
Dual band helix antenna " article, shown in below figure 2 (a) and (b).It uses the spiral of two kinds of different pitch humorous
The device that shakes devise different frequency than dual-band antenna, but the controllable double frequency spiral cavity filter of design bandwidth is not general for the wave filter
Read.
For another example, number of patent application 201020585419.5, patent name are a kind of controllable wideband microstrip filtering of bandwidth
Wave filter disclosed in device, shown in concrete structure such as Fig. 3 (a) and (b).When the second passband work of wave filter, embedded U-shaped half
Wave resonator is worked, and input/output terminal mouth line and U-shaped half-wave resonator are joined directly together, and forms tap coupler, tap position
Determine the external sort factor of the second passband, the coupling gap between resonator determines the coefficient of coup of the second passband.And
One passband work when, U-shaped half-wave resonator not resonance and be considered as feeder line, through slot-coupled to short-circuit minor matters loading resonator
Feed, its gap determine the external sort factor of the first passband, and short-circuit minor matters length determines the coefficient of coup of the first passband.This is special
Wave filter disclosed in profit is not disclosed on the general of the controllable double frequency filter of the bandwidth of spiral cavity configuration using microstrip structure
Read.
The content of the invention
The shortcomings that it is an object of the invention to overcome prior art and deficiency, it is proposed that a kind of controllable double frequency spiral of bandwidth
Cavity filter, it is controllable that the wave filter by using non-uniform-pitch structure realizes dual frequency filter frequency, passes through new feedback
It is controllable that electric structure and novel coupling structure realize bandwidth.
The purpose of the present invention is achieved through the following technical solutions：
A kind of controllable double frequency spiral cavity filter of bandwidth, including filter cavity and simultaneously be used for input and export
First radio-frequency joint 3-a of port and the second radio-frequency joint 3-b, the filter cavity is by the first resonant cavity 1-a, second
Resonant cavity 1-b and coupling window 5 form, wherein the coupling window 5 is located at the first resonant cavity 1-a and second resonance
Between cavity 1-b, for separating above-mentioned two cavity；
The first feeder equipment 7-a and the first helical resonator 2-a, wherein institute are mounted with the first resonant cavity 1-a
The first feeder equipment 7-a is stated to connect feeder line 6-a by the first coaxial inner conductor and be arranged on the first resonant cavity 1-a outer walls
The first radio-frequency joint 3-a connections, wherein the first helical resonator 2-a be fixed on by the first ground connection base 4-a it is described
First resonant cavity 1-a inwalls；
The second feeder equipment 7-b and the second helical resonator 2-b, wherein institute are mounted with the second resonant cavity 1-b
The second feeder equipment 7-b is stated to connect feeder line 6-b by the second coaxial inner conductor and be arranged on the second resonant cavity 1-b outer walls
The second radio-frequency joint 3-b connections, wherein the second helical resonator 2-b be fixed on by the second ground connection base 4-b it is described
Second resonant cavity 1-b inwalls.
Further, the coupling window 5 includes left half coupling window and right half coupling window, wherein left half coupling window includes
First window 10, wherein right half coupling window includes the second window 11 and the 3rd window 12 side by side up and down.
Further, the first window 10, the second window 11 and the 3rd window 12 are rectangular window.
Further, the four of resonant cavity where the first helical resonator 2-a and the second helical resonator 2-b is
/ mono- wavelength helical resonator.
Further, the first resonant cavity 1-a and the second resonant cavity 1-b, the first radio-frequency joint 3-a and
Two radio-frequency joint 3-b, the first feeder equipment 7-a are connected feeder line with the second feeder equipment 7-b, first coaxial inner conductor
6-a is connected feeder line 6-b, the first helical resonator 2-a and the second helical resonator 2-b and institute with the second coaxial inner conductor
The ground connection bases of the first ground connection base 4-a and second 4-b is stated to set with the median plane specular of the coupling window 5.
Further, the first feeder equipment 7-a and the second feeder equipment 7-b is the rectangle coupling of Stepped Impedance structure
Close piece；
Wherein described first feeder equipment 7-a includes the above first coaxial inner conductor connection feeder line 6-a
One Low ESR rectangle coupling piece 8-a connects the first high impedance rectangle below feeder line 6-a with positioned at first coaxial inner conductor
Coupling piece 9-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 described second feeder equipment 7-b includes the above second coaxial inner conductor connection feeder line 6-b
Two Low ESR rectangle coupling piece 8-b connect the second high impedance rectangle below feeder line 6-b with positioned at second coaxial inner conductor
Coupling piece 9-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。
Further, the first helical resonator 2-a and the second helical resonator 2-b are formed by two sections of spiral coils,
Wherein, it is more than another section respectively close to the first ground connection base 4-a and the second ground connection base 4-b spiral coil pitch
The pitch of spiral coil.
Further, the spiral coil is every section of 3 circles.
The present invention is had the following advantages relative to prior art and effect：
1st, helical cavity double frequency filter disclosed by the invention overcomes existing helical cavity double frequency filter can not realize bandwidth
The problem of controllable, the dual frequency characteristics of controllable bandwidth are realized by novel feed structure and coupled structure.
2nd, the controllable double frequency spiral cavity filter of bandwidth proposed by the present invention, the shortcomings that overcoming prior art and deficiency, have
Bandwidth is controllable, miniaturization, low dispersion, high selectivity, high power capacity, high q-factor, design and processing it is simple the features such as.
3rd, the controllable double frequency filter of bandwidth proposed by the present invention, have compared with high selectivity, actual a variety of communications can be met
It is required that.
Brief description of the drawings
Fig. 1 (a) is the structure chart of helical cavity resonator in prior art 1；
Fig. 1 (b) is the frequency response for utilizing the wave filter of resonator design in prior art 1；
Fig. 2 (a) is the structure chart of the dual-band antenna using non-uniform-pitch structure in prior art 2；
Fig. 2 (b) is the frequency response for utilizing the wave filter of non-uniform-pitch structure dual-band antenna in prior art 2；
Fig. 3 (a) is the structure chart of the controllable double frequency-band microstrip filter of bandwidth in prior art 3；
Fig. 3 (b) is the frequency response of the median filter of prior art 3；
Fig. 4 is the three-dimensional structure diagram of the double frequency spiral cavity filter that bandwidth is controllable in the present embodiment；
Fig. 5 is the sectional view of the double frequency spiral cavity filter that bandwidth is controllable in the present embodiment；
Fig. 6 (a) is the three-dimensional structure diagram of the first feeder equipment in the present embodiment；
Fig. 6 (b) is the side view of the first feeder equipment in the present embodiment；
Fig. 6 (c) is the top 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 for the coupling window plane that the present embodiment median filter is operated in low frequency centre frequency；
Fig. 9 is the magnetic chart for the coupling window plane that the present embodiment median filter is operated in high frequency centre frequency；
Figure 10 (a) is insertion loss in the present embodiment median filter | S21| with W1Variation diagram；
Figure 10 (b) is the first passband return loss in the present embodiment median filter | S11| with W1Variation diagram；
Figure 10 (c) is the second passband return loss in the present embodiment median filter | S11| with W1Variation diagram；
Figure 11 (a) is insertion loss in the present embodiment median filter | S21| with W2Variation diagram；
Figure 11 (b) is the first passband return loss in the present embodiment median filter | S11| with W2Variation diagram；
Figure 11 (c) is the second passband return loss in the present embodiment median filter | S11| with W2Variation diagram；
Figure 12 (a) is insertion loss in the present embodiment median filter | S21| with H1Variation diagram；
Figure 12 (b) is the first passband return loss in the present embodiment median filter | S11| with H1Variation diagram；
Figure 12 (c) is the second passband return loss in the present embodiment median filter | S11| with H1Variation diagram；
Figure 13 (a) is insertion loss in the present embodiment median filter | S21| with H2Variation diagram；
Figure 13 (b) is the first passband return loss in the present embodiment median filter | S11| with H2Variation diagram；
Figure 13 (c) is the second passband return loss in the present embodiment median filter | S11| with H2Variation diagram；
Figure 14 is the Electromagnetic Simulation curve map of the filter freguency response disclosed in the present embodiment；
In figure, reference is：1-a is the first resonant cavity, and 1-b is the second resonant cavity, and 2-a is the first spiral resonance
Device, 2-b are the second helical resonator, and 3-a is the first radio-frequency joint, and 3-b is the second radio-frequency joint, and 4-a is the first ground connection base,
4-b is the second ground connection base, and 5 be coupling window, and 6-a is that the first coaxial inner conductor connects feeder line, and 6-b connects for the second coaxial inner conductor
Connect feeder line, 7-a is the first feeder equipment, and 7-b is the second feeder equipment, and 8-a is the first Low ESR rectangle coupling piece, 8-b
Two Low ESR rectangle coupling pieces, 9-a are the first high impedance rectangle coupling piece, and 9-b is the second high impedance rectangle coupling piece, and 10 be
One window, 11 be the second window, and 12 be the 3rd window.
Embodiment
To make the objects, technical solutions and advantages of the present invention clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
Embodiment
Fig. 4 and Fig. 5 are referred to, Fig. 4 and Fig. 5 are the vertical of the double frequency spiral cavity filter that bandwidth is controllable in the present embodiment respectively
Body structure chart and sectional view.
As illustrated, the double frequency spiral cavity filter that a kind of bandwidth disclosed in this implementation is controllable, including filter cavity
And it is used for the first radio-frequency joint 3-a and the second radio-frequency joint 3-b of input and output port, the filter cavity simultaneously
It 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 located at the first resonant cavity 1-a
And second between resonant cavity 1-b, for separating and connecting above-mentioned two cavity.
The first feeder equipment 7-a and the first helical resonator 2-a are provided with first resonant cavity 1-a, wherein the first feedback
Electric installation 7-a connects feeder line 6-a by the first coaxial inner conductor and connect with being arranged on the first radio frequency of the first resonant cavity 1-a outer walls
Head 3-a connections, wherein the first helical resonator 2-a is fixed on the first resonant cavity 1-a inwalls by the first ground connection base 4-a.
The second feeder equipment 7-b and the second helical resonator 2-b are provided with second resonant cavity 1-b, wherein the second feedback
Electric installation 7-b connects feeder line 6-b by the second coaxial inner conductor and connect with being arranged on the second radio frequency of the second resonant cavity 1-b outer walls
Head 3-b connections, wherein the second helical resonator 2-b is fixed in the second resonant cavity 1-b by the second ground connection base 4-b
Wall.
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
The ground connection of ground connection base 4-a and second base 4-b is respectively the base portion of two resonant cavities, and its effect is fixed spiral resonance
Device and realize the helical resonator short circuit short-circuit end resonant cavity body chamber outer wall of helical resonator (connection).
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,
One feeder equipment 7-a is connected feeder line 6-a and is connected with the second coaxial inner conductor with the second feeder equipment 7-b, the first 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 face speculars centered on coupling window 5 are set.
Coupling window 5 is the coupling window of two resonant cavities of connection.The present invention be directed not only to the first helical resonator 2-a and
Second helical resonator 2-b uses the helical resonator of non-uniform-pitch, the feeds of more particularly to the first feeder equipment 7-a and second
Device 7-b novel feed structure and the new coupling window structure of coupling window 5.
The centre frequency of two passbands of the controllable double frequency spiral cavity filter of bandwidth is humorous by the first spiral in the present embodiment
Device 2-a and the second helical resonator 2-b structure of shaking and the size of the part determine.
The bandwidth of two passbands of the controllable double frequency spiral cavity filter of bandwidth is then mainly by external sort in the present embodiment
Factor Qe and coefficient of coup K controls.And the external sort factor Qe1 and Qe2 of above-mentioned two passband by the first feeder equipment 7-a and
The size of the rectangle coupling piece of second feeder equipment 7-b novel feed structure (i.e. Stepped Impedance feed structure) determines.On and
The coefficient of coup K1 and K2 for stating 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 includes the first Low ESR above the first coaxial inner conductor connection feeder line 6-a
Rectangle coupling piece 8-a connects the first high impedance rectangle coupling piece 9-a below feeder line 6-a with positioned at the first coaxial inner conductor, and
And first high impedance rectangle coupling piece 9-a width be less than the first Low ESR rectangle coupling piece 8-a；
Wherein the second feeder equipment 7-b includes the second Low ESR above the second coaxial inner conductor connection feeder line 6-b
Rectangle coupling piece 8-b connects the second high impedance rectangle coupling piece 9-b below feeder line 6-b with positioned at the second coaxial inner conductor, and
And second high impedance rectangle coupling piece 9-b width be 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 side view of the first feeder equipment in the present embodiment；
Fig. 6 (c) is the top 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 first feeder equipment 7-a according to embodiments of the present invention three-dimensional structure diagram, side
View, top view and front view, the feeder equipment are the rectangle coupling piece of Stepped Impedance structure, and the first coaxial inner conductor connects
The first Low ESR rectangle coupling piece 8-a above feeder line 6-a is Low ESR (physical size is wider) coupling piece, and the first of lower section
High impedance rectangle coupling piece 9-a is high impedance (physical size is narrower) coupling piece.It is low according to the Electric Field Distribution of two patterns, first
The increase of impedance rectangle coupling piece 8-a length, the external sort factor Q of the first passbande1Increase, and the external sort of the second passband because
Number Qe2Reduce.The increase of first high impedance rectangle coupling piece 9-a length, the external sort factor of two passbands all increase.Therefore originally
The external sort factor of two passbands of the controllable double frequency spiral cavity filter of bandwidth can pass through this Stepped Impedance in embodiment
The rectangle coupling piece independent control of structure.
Due to the second feeder equipment 7-b and the first feeder equipment 7-a speculars of the embodiment of the present invention, therefore structure and set
It is identical to count principle.
As shown in fig. 7, Fig. 7 is the structure chart of coupling window in the present embodiment, as can be known from Fig. 7, the coupling window 5 of the structure by
Left half coupling window and right half coupling window are formed, and left half coupling window includes first window 10, and right half coupling window includes side by side up and down set
The second window 11 put and the 3rd window 12.The size of the first window 10 of left half coupling window is more than the second window of right half coupling window
The window 12 of mouth 11 and the 3rd.
According to the Distribution of Magnetic Field of two patterns, the size of two wickets (i.e. the second window 11 and the 3rd window 12) can be single
The solely coefficient of coup K of the second passband of control2, and have substantially no effect on the coefficient of coup K of the first passband1, big window (i.e. first window
10) coefficient of coup K of two passbands is then controlled simultaneously1And K2, therefore the coefficient of coup of two passbands can be only by this coupling window
Vertical control.Therefore, because two passband external sort factor Qe1And Qe2With coefficient of coup K1And K2All can independent control, so two
The bandwidth of passband is individually controllable.
The selection of coupling window is mainly to be 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.As shown in Figure 8 and Figure 9 the magnetic field of window side is being coupled for two patterns of wave filter
Figure, the magnetic coupling window side of low frequency mode (basic mode) is magnetic field face in the same direction.And the magnetic field of high frequency mode (second higher mode)
Window side is coupled as magnetic field face incorgruous up and down.
As shown in fig. 7, first window 10 had both coupled low frequency mode or couples high frequency pattern, and the second window 11 and the 3rd window
12 couples high frequency patterns of mouth are without coupling low frequency mode.
The frequency response for the wave filter being shown such as Figure 10 (a) to Figure 10 (c) disclosed in the present embodiment is with first window 10
Width W1Variation diagram.Wherein it can be seen that the coefficient of coup K of first passband1It is basically unchanged, and the coupled systemes of second passband
Number K2With W1Increase and increase.
The frequency response for the wave filter being shown such as Figure 11 (a) to Figure 11 (c) disclosed in the present embodiment is with the second window 11
With the width W of the 3rd window 122Variation diagram.Wherein it can be seen that the coefficient of coup K of first passband1With the coupling of second passband
Close COEFFICIENT K2With W2Increase and increase.Therefore the coefficient of coup K of two passbands1And K2Can be by W1And W2Control.
The frequency response for the wave filter being shown such as Figure 12 (a) to Figure 12 (c) disclosed in the present embodiment is with low-impedance coupling
Rectangular sheet height H1Variation diagram.H1By 3.3mm to 4.3mm to 5.3mm, the external sort factor Q of passband 1e1Gradually increase, and lead to
With 2 external sort factor Qe2It is gradually reduced.Reason is that upper and lower phase is consistent, therefore H because when being operated in low frequency pass band1
It is bigger, Qe1Gradually increase.And when being operated in high frequency pass band, upper and lower phase is inconsistent, H1With Qe2Negative correlation, therefore H1It is bigger,
Qe2It is gradually reduced.
The frequency response for the wave filter being shown such as Figure 13 (a) to Figure 13 (c) disclosed in the present embodiment is with low-impedance coupling
Rectangular sheet height H1Variation diagram.H2By 5.7mm to 4.7mm to 3.7mm, the external sort factor Q of passband 1e1It is gradually reduced, passband
2 external sort factor Qe2Also it is gradually reduced.Reason is that upper and lower phase is consistent, therefore H because when being operated in low frequency pass band2
It is smaller, Qe1It is gradually reduced.And when being operated in high frequency pass band, upper and lower phase is inconsistent, H2With Qe2Positive correlation, therefore H2It is smaller,
Qe2Also it is gradually reduced.
Therefore by H1And H2Two parameters can control Qe1And Qe2.Again due to coefficient of coup K1And K2Can be by W1And W2Control,
Therefore the bandwidth of two passbands is controllable.
In actual design, the frequency of passband should be determined by helical resonator structure snd size, and the bandwidth of passband
Determined by the adjustment to feed structure and size, the structure snd size of coupling window.In the present embodiment, given passband frequency
Rate index is f1=460MHz, f2=1028MHz, it is the descending two-stage structure of pitch from top to bottom to select helical resonator, often
The circles of Duan Douwei 3, big pitch dimension are 5mm, and small size pitch is 1.5mm, and helical radius is 0.5mm, and spiral winding radius is
5mm.The a length of 2mm*4.6mm of wide * of the high impedance rectangle coupling chip size of Stepped Impedance feed structure, Low ESR rectangle coupling piece
The a length of 4mm*4.1mm of wide * of size.The a length of 3mm*21mm of wide * of the size of big coupling window, the wide * length of the size of small coupling window
For 9mm*9mm.The wave filter is made of metal, and is made in this embodiment using metallic aluminium, and silver-plated on top layer, to reduce damage
Consumption.
Figure 14 is the Electromagnetic Simulation curve according to the filter freguency response disclosed in the embodiment of the present invention.Can be with from figure
The centre frequency for finding out two passbands is respectively 460MHz and 1028MHz, and frequency ratio is 2.23.The absolute bandwidth of first passband is
10MHz, the absolute bandwidth of the second passband is 7MHz.
In summary, the present embodiment proposes a kind of design of the controllable helical cavity double frequency filter of bandwidth, this side
Case obtains the controllable double frequency filtering characteristic of bandwidth under less volume.Because spiral cavity filter has low dispersion, high power
The characteristics of capacity, high q-factor, it is adapted to practical application in industry.The present invention can reduce circuit volume while high-performance filtering is realized
And reduce cost.The wave filter novelty is that the double frequency that controllable bandwidth is realized by novel feed structure and coupled structure is special
Property.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (6)
1. a kind of controllable double frequency spiral cavity filter of bandwidth, including filter cavity and it is used for input and output side simultaneously
The first radio-frequency joint (3-a) of mouth and the second radio-frequency joint (3-b), it is characterised in that：The filter cavity is humorous by first
Shake cavity (1-a), the second resonant cavity (1-b) and coupling window (5) composition, wherein the coupling window (5) is humorous positioned at described first
Shake between cavity (1-a) and second resonant cavity (1-b), for separating above-mentioned two cavity；
The first feeder equipment (7-a) and the first helical resonator (2-a) are mounted with first resonant cavity (1-a), wherein
First feeder equipment (7-a) connects feeder line (6-a) by the first coaxial inner conductor and is arranged on first resonant cavity
First radio-frequency joint (3-a) connection of (1-a) outer wall, wherein first helical resonator (2-a) passes through the first ground connection base
(4-a) is fixed on the first resonant cavity (1-a) inwall；
The second feeder equipment (7-b) and the second helical resonator (2-b) are mounted with second resonant cavity (1-b), wherein
Second feeder equipment (7-b) connects feeder line (6-b) by the second coaxial inner conductor and is arranged on second resonant cavity
Second radio-frequency joint (3-b) connection of (1-b) outer wall, wherein second helical resonator (2-b) passes through the second ground connection base
(4-b) is fixed on the second resonant cavity (1-b) inwall；First feeder equipment (7-a) and the second feeder equipment (7-b)
It is the rectangle coupling piece of Stepped Impedance structure；
Wherein described first feeder equipment (7-a) includes the above first coaxial inner conductor connection feeder line (6-a)
One Low ESR rectangle coupling piece (8-a) connects the first high impedance below feeder line (6-a) with positioned at first coaxial inner conductor
Rectangle coupling piece (9-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 described second feeder equipment (7-b) includes the above second coaxial inner conductor connection feeder line (6-b)
Two Low ESR rectangle coupling pieces (8-b) connect the second high impedance below feeder line (6-b) with positioned at second coaxial inner conductor
Rectangle coupling piece (9-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)；
The coupling window (5) includes left half coupling window and right half coupling window, wherein left half coupling window includes first window
(10), wherein right half coupling window includes the second window (11) and the 3rd window (12) side by side up and down.
A kind of 2. controllable double frequency spiral cavity filter of bandwidth according to claim 1, it is characterised in that：First window
Mouth (10), the second window (11) and the 3rd window (12) they are rectangular window, and the coupling between coupling window is magnetic coupling, wherein, institute
State first window (10) and both couple low frequency mode or couples high frequency pattern, second window (11) and the 3rd window (12)
Couples high frequency pattern is without coupling low frequency mode.
A kind of 3. controllable double frequency spiral cavity filter of bandwidth according to claim 1, it is characterised in that：
First helical resonator (2-a) and the quarter-wave that the second helical resonator (2-b) is place resonant cavity
Long spire resonator.
A kind of 4. controllable double frequency spiral cavity filter of bandwidth according to claim 2, it is characterised in that：
First resonant cavity (1-a) and the second resonant cavity (1-b), first radio-frequency joint (3-a) and the second radio frequency
Joint (3-b), first feeder equipment (7-a) are connected feeder line with the second feeder equipment (7-b), first coaxial inner conductor
(6-a) is connected feeder line (6-b), first helical resonator (2-a) and the second helical resonator (2- with the second coaxial inner conductor
B) and the first ground connection base (4-a) is grounded base (4-b) with the median plane mirror image pair of the coupling window (5) with second
Claim to set.
A kind of 5. controllable double frequency spiral cavity filter of bandwidth according to claim 4, it is characterised in that：
First helical resonator (2-a) is formed with the second helical resonator (2-b) by two sections of spiral coils,
Wherein, it is more than another section respectively close to the pitch of the first ground connection base (4-a) and the spiral coil of the second ground connection base (4-b)
The pitch of spiral coil.
A kind of 6. controllable double frequency spiral cavity filter of bandwidth according to claim 5, it is characterised in that：
The spiral coil is every section of 3 circles.
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| CN110112521B (en) * | 2019-05-23 | 2023-11-21 | 井冈山大学 | Small four-die cavity dual-band broadband filter |
| CN112242832B (en) * | 2020-10-31 | 2024-07-19 | 华南理工大学 | Double-frequency filter switch based on multiple fusion structure |
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