CN107508020B - Resonator and Elliptic Function Type low-pass filter - Google Patents
Resonator and Elliptic Function Type low-pass filter Download PDFInfo
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- CN107508020B CN107508020B CN201710872078.6A CN201710872078A CN107508020B CN 107508020 B CN107508020 B CN 107508020B CN 201710872078 A CN201710872078 A CN 201710872078A CN 107508020 B CN107508020 B CN 107508020B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
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Abstract
The invention discloses a resonator. The resonator comprises an equivalent capacitor structure and an equivalent inductor structure; the equivalent capacitor structure comprises a U-shaped metal structure and a metal partition plate which is equal to the U-shaped metal structure in height but smaller in thickness, the metal partition plate is arranged in the middle of the U-shaped metal structure, and the thickness direction of the U-shaped metal structure is equally divided into two symmetrical parts; the equivalent inductance structure is a metal rod, and the lower end of the equivalent inductance structure is fixedly connected with the upper edge of the metal partition plate. The invention also discloses an elliptic function type low-pass filter. The elliptic function type low-pass filter adopts the resonator with a special structure, the whole filter does not need tuning, the required parts are few, a plurality of parts adopt a common structure, the elliptic function type low-pass filter has the advantages of compact integral structure and easy manufacture and assembly, and has the characteristics of small insertion loss, large power capacity and good out-of-band rejection, and is particularly suitable for high-power application occasions with lower frequency.
Description
Technical field
The present invention relates to a kind of resonator for low-pass filter and the Elliptic Function Type low pass based on the resonator
Filter.
Background technique
In the electronic device, no matter using which kind of frequency synthesis mode, due to its inherent characteristic, harmonic wave and miscellaneous can all be generated
It dissipates, these harmonic waves and the spuious normal work that electronic equipment can be interfered after amplifier amplifies.In addition modern radar and communication
Equipment increases the peak power and mean power of output in order to pursue farther operating distance, but high power transmitter is inevitable
Excessively high harmonic power can be brought, the harmonic energy meeting severe jamming of these high-power transmitters even burns electronic equipment.Separately
The outer underproof electronic equipment of output harmonic wave can not also obtain the factory licensing of Wireless Management Committee.Therefore it must penetrate
Frequency front end filters out the harmonic spectrum energy of electronic equipment output.
The low-pass filter for filtering out harmonic wave currently used for waveguide radio frequency front end mainly has: coaxial sugarcoated haws shape low-pass filtering
Device.The low-pass filter of sugarcoated haws structure is functional, and structure is simple, is widely used.
But since the transmission response curve that the low-pass filter of sugarcoated haws form does not have is Chebyshev's response curve, do not have
Transmission zero, it is therefore necessary to many ranks that could obtain preferable Out-of-band rejection characteristic.This results in the volume of filter larger,
The especially lower frequency range of frequency, such as several hundred MHz frequency ranges.More additionally, due to the order of filter, Insertion Loss is big, can deteriorate system
Performance.In powerful application, since Insertion Loss is big, caused loss is big, and calorific value is big, may burn entire filtering
Device.
In order to overcome the shortcomings of the low-pass filter of conventional sugar cucurbit form, there is researcher to propose a kind of novel low pass
Filter, the frequency response curve of the low-pass filter meet elliptic function curve (have outside elliptic function response curve band and
Equal number of transmission zero in passband), therefore it is called Elliptic Function Type low-pass filter.For example, Chinese invention patent
CN102354778 discloses a kind of Elliptic Function Type low pass filtering access, metal cavity be provided with it is multiple be sequentially connected it is logical
Sub- chamber is equipped with resonant column between two neighboring sub- chamber, is equipped with stub above resonant column, stub corresponds to be set at each resonant column
There is through-hole, each resonant column has a tuning screw to pass through corresponding through-hole and gos deep into the resonant column so that tuning screw is humorous with this
Shake column capacitive coupling, and stub both ends are respectively formed two connectivity ports.For another example, Chinese invention patent CN103855447 institute is public
The Elliptic Function Type low-pass filter opened use one group include with conducting wire the inductance element made of folding and be printed with tuning disk
The resonant element of dielectric-slab, transverse direction setting of the dielectric-slab across the top of the lengthwise cavity, the inductance element one
End and the tuning disk of the dielectric-slab connect, and the other end and the transmission pole connect.Both the above low-pass filter
All have that size is larger, and structure is complicated, part is more, and group reload request is high, and assembly precision is not easily controlled, and tuning screw is needed to carry out
The problems such as tuning.Additionally, due to there is tuning screw, electric field is concentrated at tuning screw, in high-power situation, it is easy at this
It strikes sparks at tuning screw, thus its power capacity is extremely restricted.
Summary of the invention
Technical problem to be solved by the present invention lies in overcoming the shortcomings of present in existing Elliptic Function Type low-pass filter,
There is provided first a kind of structure it is simple, convenient for manufacture and the reliable and stable resonator of electric property, and provide one kind on its basis
Compact-sized, insertion loss is small, and power capacity is big, the good Elliptic Function Type low-pass filter of Out-of-band rejection.
Resonator of the present invention includes an equivalent capacity structure and an equivalent inductance structure；The equivalent capacity structure packet
Include that a U-shaped metal structure and one is contour with the U-shaped metal structure but the lesser metal partion (metp) of thickness, the metal every
Plate is set to U-shaped metal structure middle and the thickness direction of U-shaped metal structure is divided into symmetrical two parts；It is described equivalent
Induction structure is a metallic rod, and lower end is fixedly connected with the top edge of metal partion (metp).
Preferably, the metallic rod whole linear, broken line, curve or serpentine.
Preferably, the upper end of the metallic rod is provided with the through-hole for passing through conducting wire.
It is further preferred that being additionally provided with one for assisting the blind hole of welding in the through-hole side.
Preferably, the equivalent capacity structure and the molding of equivalent inductance structural integrity.
Elliptic Function Type low-pass filter of the present invention, including the shell being combined by the full symmetric half shell of two panels, institute
It states enclosure interior and is formed with cavity；An electrical connection is each provided on the housing wall at the relative position of the cavity both ends
Device, two electric connectors pass through a conducting wire electrical connection in cavity；The lower section of the conducting wire, is walked along conducting wire in the cavity
To being disposed with one group of as above resonator described in any technical solution, the metallic rod upper end of each resonator and conducting wire electricity
Connection.
Preferably, each resonator configuration has the symmetrical dielectric set of two panels, for resonator to be fixed on the appearance
In chamber；Two panels dielectric set corresponds respectively to two parts that the U-shaped metal structure of the resonator is separated by metal partion (metp),
Every dielectric set entangles the U-shaped metallic moiety corresponding to it with fitting closely.
Preferably, the material of the dielectric set is polytetrafluoroethylene (PTFE).
Further, the back side of each dielectric set, which is each formed at one, is recessed, corresponding with each dielectric set
A boss is provided in inner walls at position, each boss can be tightly embedded intp its corresponding dielectric set back side
In recess, the positioning and clamping to resonator is realized.
Preferably, each boss and half-shell body by integral forming where it.
The preferred silver-coated copper wire of conducting wire.
Further, the partition wall for preventing signal coupling between the two, the height of partition wall are provided between adjacent resonators
Lower than height of the conducting wire in cavity.
Preferably, each partition wall is made of symmetrical two halves, each half partition wall half-shell body by integral forming ipsilateral with it.
Preferably, the resonator shares 2n, and the transmission pole resonance frequency of each resonator is in the filter
It transmits in passband, the transmission zero resonance frequency of each resonator is at the Out-of-band rejection of the filter；This 2n are walked along conducting wire
I-th and 2n+1-i into the resonator set gradually is identical for two resonators in one group, each group, belongs to not
Resonator with group has different transmission pole resonance frequencies and different transmission zero resonance frequencies；Wherein, n be non-zero from
So number, i=1,2 ..., n.
Alternatively, the resonator shares 2n+1, the transmission pole resonance frequency of each resonator is in the filter
It transmits in passband, the transmission zero resonance frequency of each resonator is at the Out-of-band rejection of the filter；This 2n+1 along conducting wire
It moves towards 2n resonator in the resonator that sets gradually in addition to (n+1)th and is divided into n group, i-th a with 2n+2-i to be
Two resonators in one group, each group are identical, belong to different groups of resonator have different transmission pole resonance frequency and
Different transmission zero resonance frequencies, the transmission pole resonance frequency and transmission zero resonance frequency of (n+1)th resonator with appoint
Anticipate one group of resonator transmission pole resonance frequency and transmission zero resonance frequency it is all different；Wherein, n is non-zero natural number, i=
1,2 ..., n.
Compared with prior art, the invention has the following advantages:
Elliptic Function Type low-pass filter of the present invention uses the resonator of special construction, and entire filter does not need to tune,
Required components are few, and multiple components use syntype structure, have the advantages that compact overall structure, easily fabricated assembly, and have
There is the characteristic that insertion loss is small, power capacity is big, Out-of-band rejection is good, is particularly suitable for the high-power applications occasion of lower frequency.
Detailed description of the invention
Fig. 1 is the equivalent circuit schematic of five rank low-pass filters in specific embodiment；
Fig. 2 is the appearance diagram of five rank low-pass filters in specific embodiment；
Fig. 3 is the Structure explosion diagram of five rank low-pass filters in specific embodiment；
Fig. 4 is the structural schematic diagram of half shell；
Fig. 5 is the structural schematic diagram of first order resonator；
The structural schematic diagram of Fig. 6, Fig. 7 PTFE set mating for first order resonator；
Fig. 8 is the frequency response curve of first order resonator；
Fig. 9 is the structural schematic diagram of second level resonator；
The structural schematic diagram of Figure 10, Figure 11 PTFE set mating for second level resonator；
Figure 12 is the frequency response curve of second level resonator；
Figure 13 is the structural schematic diagram of third level resonator；
The structural schematic diagram of Figure 14, Figure 15 PTFE set mating for third level resonator；
Figure 16 is the frequency response curve of third level resonator；
Figure 17 is the frequency response curve of five rank low-pass filters.
Each label meaning is as follows in figure:
1 is half shell, and 2 be electric connector, and 3 be conducting wire, and 4 be first order resonator, and 5 be the PTFE of first order resonator
Set, 6 be second level resonator, and 7 cover for the PTFE of second level resonator, and 8 be third level resonator, and 9 be third level resonator
PTFE set, 100 be channel, and 101 be partition wall, and 102 be boss.
Specific embodiment
The present invention constructs Elliptic Function Type low-pass filter, the biography of each resonator using the resonator of several special constructions
Defeated pole resonance frequency is in the transmission passband of the filter, and the transmission zero resonance frequency of each resonator is in the filter
Out-of-band rejection at.In order to obtain optimal electric property, present invention preferably employs centrosymmetric resonator layout's structure, tools
For body,
When resonator sum is even number, i.e., the described resonator shares 2n, this 2n set gradually along conducting wire trend
I-th and 2n+1-i in resonator is identical for two resonators in one group, each group, belongs to different groups of resonator
With different transmission pole resonance frequencies and different transmission zero resonance frequencies；
When resonator sum is odd number, i.e. resonator shares 2n+1, this 2n+1 set gradually along conducting wire trend
2n resonator in resonator in addition to (n+1)th is divided into n group, and i-th and 2n+2-i is in one group, each group
Two resonators are identical, belong to different groups of resonator and have different transmission pole resonance frequencies and different transmission zeros humorous
Vibration frequency, the transmission pole resonance frequency of (n+1)th resonator and the biography of transmission zero resonance frequency and any one group of resonator
Defeated pole resonance frequency and transmission zero resonance frequency are all different；
Wherein, n is non-zero natural number, i=1,2 ..., n.
For the ease of public understanding, below by taking one works in the 5 rank low-pass filters of 300MHz as an example and in conjunction with attached drawing
Technical solution of the present invention is described in detail.The working passband that the 5 rank low-pass filter requires is 360MHz -400MHz,
It is required that at outer 420MHz inhibit be greater than 40dB.
Fig. 1 shows the equivalent circuit theory of the five ranks low-pass filter, and the low-pass filter is by 6 capacitors and inductance string
It is linked to the resonator on ground, and the high-impedance transmission line composition of 6 resonators of connecting.
Fig. 2 is the appearance of the five ranks low-pass filter, and Fig. 3 is the Structure explosion diagram of the five ranks low-pass filter.Such as Fig. 2,3
Shown, the shell of the five ranks low-pass filter is composed of the full symmetric half shell 1 of two panels, and enclosure interior forms a cross
To long and narrow cavity, an electric connector 2 is each provided on the housing wall at the relative position of cavity left and right ends, two are electrically connected
It connects device 2 to be electrically connected in cavity by a conducting wire 3, in the lower section of the cavity inside conductor 3, the trend along conducting wire 3 is successively set
6 resonators are set, this 6 resonators include that two identical first resonators 4, two are second resonator 6, two identical
Identical three-level resonator 8.As shown in figure 3, this 6 resonators are arranged symmetrically, two first resonators 4 are set to a left side for cavity
Right both ends, then toward cavity center be two second resonators 6, the position at cavity center is two three-level resonators 8.Each resonance
Device is equipped with the symmetrical dielectric set of corresponding two panels, for resonator to be fixed in cavity.Insulation in the present embodiment
Medium cover material uses polytetrafluoroethylene (PTFE) (Polytetrafluoroethylene is abbreviated as PTFE), which is also known as Teflon
Dragon has good sealing property, high lubrication, non-stickiness, electrical insulation and good ageing resistance, heat-resisting ability and resists
Corrosive power.PTFE covers 5,7,9 shape, size is fitted with first resonator 4, second resonator 6,8 phase of three-level resonator respectively
Match.The low-pass filter of other orders is also to constitute according to same principle, and only the number of used resonator is different.
Fig. 4 shows the specific structure of half shell 1.Lead to as shown in figure 4, the top of its cavity is divided into for what conducting wire 3 passed through
Road 100, the channel and conducting wire 3 constitute signal path；The signal path generally requires in the low-pass filter of such form
It is greater than 50 ohm of high impedance line for characteristic impedance；The cavity of signal path is bigger, then the characteristic impedance of corresponding lead 3 is got over
Greatly, the conducting wire 3 of inductance required for obtaining is shorter；If otherwise the size of signal path cavity is smaller, the characteristic resistance of conducting wire 3
Anti- just smaller, the conducting wire 3 of inductance required for obtaining is also longer.Conducting wire 3 in the present embodiment is silver-coated copper wire, this is silver-plated
Copper wire equivalent-circuit model is equivalent to the biggish inductance of inductance, and inductance is by the length of the silver-coated copper wire with it in chamber
What the characteristic impedance in body determined.The lower section in channel 100 is the part for placing resonator.It is deposited between two resonators in order to prevent
It is coupled in harmful signal, as shown in figure 4, being both provided with partition wall 101 between adjacent resonators.Place the cavity portion of resonator
Point size shape and installation the PTFE set that wraps up resonator inside it outer dimensional shape it is exactly like, thus can be by
Resonator is fixed in cavity.The thickness in each face is essentially identical in PTFE set in the present embodiment, thus can overleaf external shape
At recess at one (this recess can also be obtained using other modes).In the present embodiment, at corresponding PTFE set external concavity,
The boss 102 that geomery matches therewith is just being provided on 1 inner wall of half shell.When fixing resonance device, boss 102 can
Will be firmly stuck in cavity by the resonator that wraps of PTFE set, not only there is a good positioning action, and because
There is contact well and there is good heat dissipation effect, is conducive to its occasion for applying to high power work.Above-mentioned half shell 1,
The components such as partition wall 101, boss 102 can be used integral forming process and be integrally formed to obtain, and improve production efficiency, reduce production
Cost.
The structure of first resonator, second resonator, three-level resonator is respectively such as Fig. 5, Fig. 9, Tu13Suo in the present embodiment
Show.It can be seen from the figure that resonator of the present invention consists of two parts: the equivalent capacity structure of lower part and top
Equivalent inductance structure；The equivalent capacity structure includes that a U-shaped metal structure and one are contour with the U-shaped metal structure
But the lesser metal partion (metp) of thickness, the metal partion (metp) are set to U-shaped metal structure middle and by the thickness of U-shaped metal structure
Direction is divided into symmetrical two parts；The equivalent inductance structure is a metallic rod, the top edge of lower end and metal partion (metp)
It is fixedly connected.Equivalent capacity structure function therein is to form the capacitor for being parallel to ground, which is that two sides is symmetrical；Phase
Main function to thinner metal rod structure (equivalent inductance structure) is to form a lesser inductance.In the present embodiment, In
The top side of metallic rod as equivalent inductance structure is all provided with the through-hole pierced, the through-hole be used for assembly when
It waits, passes through silver-coated copper wire, in addition, being also provided with a lesser blind hole on the upper surface of metallic rod top, the blind hole is for assisting weldering
It connects, trickles when welding silver-coated copper wire resonator metallic rod convenient for scolding tin, it is ensured that the quality of welding.It can be seen from the figure that
First resonator, second resonator, the equivalent capacity structure of three-level resonator and equivalent inductance structure specific size there are areas
Not, the difference of each resonator electric property is thus brought.In addition, as equivalent inductance structure metallic rod can using straight line,
The various structures such as broken line, curve or serpentine.As shown in figure 13, the equivalent inductance structure of three-level resonator uses in the present embodiment
Snakelike cable architecture is the length in order to shorten induction structure using snakelike cable architecture, reduces volume；Using the same energy of linear structure
Access same performance.The resonator structure very simple, does not need to tune, and one-shot forming technique integrated molding can be used,
Manufacturing cost is cheap.
It is humorous that Fig. 6 and Fig. 7, Figure 10 and Figure 11, Figure 14 and Figure 15 respectively illustrate first resonator, second resonator, three-level
The structure that the PTFE corresponding to device that shakes covers.As shown, the U-shaped metal structure that two panels PTFE set corresponds respectively to the resonator is golden
Belong to two parts that partition is separated, every PTFE set entangles the U-shaped metallic moiety corresponding to it with fitting closely.Cause
This, the shape and size of PTFE set are all that the equivalent capacity structure for the resonator to be wrapped up by it is determined.It is being filled
Timing, the equivalent capacity structure of resonator, which is entangled rear directly compress, with PTFE set can will complete resonator consolidating in cavity
Dingan County's dress.In the present embodiment PTFE cover each face thickness it is almost the same, in this way, can all be generated at the back side of set corresponding recessed
Fall into, to be blocked in assembly by the boss on 1 inner wall of half shell, can position accuracy to guarantee fitted position and
Then tight fit, it is ensured that the reliability of product.
The equivalent-circuit model of resonator of the present invention is equivalent to big ground capacity one inductance very little of series connection
Inductance.The syntonizer is there are two resonance frequency, and transmission pole resonance frequency is in required transmission passband, transmission zero
Point resonance frequency is at desired Out-of-band rejection.Fig. 8, Figure 12, Figure 16 respectively illustrate first resonator in the present embodiment, second level
The frequency response curve of resonator, three-level resonator；It can be seen from the figure that the frequency response curve of resonator of the present invention all wraps
Containing a transmission zero, these transmission zeros constitute the Out-of-band rejection zero point of low-pass filter.The resonance of the transmission zero
Frequency meetsL and C is the size for being connected in series to the capacitor and inductance on ground respectively in formula.Specific capacitor
It can design to obtain by basic electricity principle with inductance, such as be obtained by business software ADS optimization Simulation.
Figure 17 is the frequency response curve of the low-pass filter.As seen from Figure 17, the low-pass filter because there are
Transmission zero is limited, if being n with the order of filter, the number of Out-of-band rejection zero point meets (n+1)/2 (n is odd number), n/2+1
(n is even number), therefore the low-pass filtering has extremely superior Out-of-band rejection performance.To low with common sugarcoated haws form
Bandpass filter, frequency response be Chebyshev's receptance function, reach same Out-of-band rejection characteristic then need at least 12 ranks with
On.
In summary, the transmission frequency response of low-pass filter of the present invention is elliptic function response, and there are multiple transmission zero
Point, it is only necessary to which less order can obtain biggish Out-of-band rejection, therefore volume compact, and Insertion Loss is small, is particularly suitable for applications in
To volume requirement height, high-power occasion.
In the case where identical index, the volume of low-pass filter of the present invention is less than conventional sugarcoated haws type low-pass filtering body
Long-pending 1/4, and Insertion Loss is smaller, cost is also lower.The volume of system, improves its performance where it can also be reduced accordingly, drops
Low cost.
Compared to conventional sugarcoated haws type low-pass filter, also there is low-pass filter of the present invention highest to inhibit up to 10 frequencys multiplication
Above advantage.
Claims (15)
1. a kind of resonator, which is characterized in that including an equivalent capacity structure and an equivalent inductance structure；The equivalent electricity
Holding structure includes a U-shaped metal structure and a but thickness contour with the U-shaped metal structure less than the U-shaped metal knot
The metal partion (metp) of the thickness of structure, the metal partion (metp) are set to U-shaped metal structure middle and by the thickness sides of U-shaped metal structure
To symmetrical two parts are divided into, the thickness direction of the U-shaped metal structure refers to the direction perpendicular to the U-shaped plane；Institute
Stating equivalent inductance structure is a metallic rod, and lower end is fixedly connected with the top edge of metal partion (metp).
2. resonator as described in claim 1, which is characterized in that the metallic rod whole linear, broken line, curve or snakelike
Line.
3. resonator as described in claim 1, which is characterized in that the upper end of the metallic rod is provided with for passing through the logical of conducting wire
Hole.
4. resonator as claimed in claim 3, which is characterized in that the through-hole side be additionally provided with one for assist welding
Blind hole.
5. the resonator as described in any one of Claims 1 to 4, which is characterized in that the equivalent capacity structure and equivalent inductance knot
Structure is integrally formed.
6. a kind of Elliptic Function Type low-pass filter, which is characterized in that including what is be combined by the full symmetric half shell of two panels
Shell, the enclosure interior are formed with cavity；One is each provided on the housing wall at the relative position of the cavity both ends
Electric connector, two electric connectors pass through a conducting wire electrical connection in cavity；The lower section of the conducting wire, edge in the cavity
Conducting wire trend is disposed with one group of resonator as described in any one of Claims 1 to 5, the metallic rod upper end of each resonator with
The conducting wire electrical connection.
7. Elliptic Function Type low-pass filter as claimed in claim 6, which is characterized in that each resonator configuration has two panels symmetrical
Dielectric set, for resonator to be fixed in the cavity；Two panels dielectric set corresponds respectively to the U of the resonator
Two parts that type metal structure is separated by metal partion (metp), every dielectric set entangle the U corresponding to it with fitting closely
Type metallic moiety.
8. Elliptic Function Type low-pass filter as claimed in claim 7, which is characterized in that the material of the dielectric set is poly-
Tetrafluoroethene.
9. Elliptic Function Type low-pass filter as claimed in claim 7, which is characterized in that the equal shape in the back side of each dielectric set
It is recessed at Cheng Youyi, is covered with each dielectric and be provided with a boss in the inner walls at opposite position, it is each convex
Platform can be tightly embedded intp in its corresponding dielectric set back side recess, realize the positioning and clamping to resonator.
10. Elliptic Function Type low-pass filter as claimed in claim 9, which is characterized in that each boss and half shell one where it
It is body formed.
11. Elliptic Function Type low-pass filter as claimed in claim 6, which is characterized in that the conducting wire is silver-coated copper wire.
12. Elliptic Function Type low-pass filter as claimed in claim 6, which is characterized in that be provided between adjacent resonators
The partition wall of signal coupling between the two is prevented, the height of partition wall is lower than height of the conducting wire in cavity.
13. Elliptic Function Type low-pass filter as claimed in claim 12, which is characterized in that each partition wall is by symmetrical two halves
It constitutes, each half partition wall half-shell body by integral forming ipsilateral with it.
14. Elliptic Function Type low-pass filter as claimed in claim 6, which is characterized in that the resonator shares 2n, each
The transmission pole resonance frequency of resonator is in the transmission passband of the filter, the transmission zero resonance frequency of each resonator
At the Out-of-band rejection of the filter；This 2n in the resonator that conducting wire trend is set gradually theiA and 2n+1-iIt is a
It is that two resonators in one group, each group are identical, belonging to different groups of resonator has different transmission pole resonance frequencies
With different transmission zero resonance frequencies；Wherein, n is non-zero natural number, i=1,2 ..., n.
15. Elliptic Function Type low-pass filter as claimed in claim 6, which is characterized in that the resonator shares 2n+1, often
The transmission pole resonance frequency of a resonator is in the transmission passband of the filter, the transmission zero resonance frequency of each resonator
Rate is at the Out-of-band rejection of the filter；This 2n+1 along the resonator that conducting wire trend is set gradually in addition to (n+1)th
2n resonator is divided into n group, theiA and 2n+2-iA is one group, and two resonators in each group are identical, belongs to difference
The resonator of group has different transmission pole resonance frequencies and different transmission zero resonance frequencies, (n+1)th resonator
The transmission pole resonance frequency and transmission zero of transmission pole resonance frequency and transmission zero resonance frequency and any one group of resonator
Point resonance frequency is all different；Wherein, n is non-zero natural number, i=1,2 ..., n.
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| CN109560355B (en) * | 2018-12-28 | 2024-05-14 | 重庆思睿创瓷电科技有限公司 | Dielectric body for 5G communication, dielectric waveguide filter, radio frequency module and base station |
| CN112928909B (en) * | 2019-12-06 | 2023-03-07 | 重庆大及电子科技有限公司 | EMI filtering device |
| CN112039472B (en) * | 2020-06-18 | 2024-04-30 | 中芯集成电路（宁波）有限公司 | Film acoustic wave filter and manufacturing method thereof |
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| 用于椭圆函数滤波器高级模块化设计的单腔体计算机辅助设计;杨钊 等;《现代电子技术》;20070501(第9期);98-100 * |
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