CN109149038A - Waveguide filter and its manufacturing method - Google Patents
Waveguide filter and its manufacturing method Download PDFInfo
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- CN109149038A CN109149038A CN201811003085.3A CN201811003085A CN109149038A CN 109149038 A CN109149038 A CN 109149038A CN 201811003085 A CN201811003085 A CN 201811003085A CN 109149038 A CN109149038 A CN 109149038A
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- waveguide
- circular
- port
- fluting
- ring flange
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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
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2082—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with multimode resonators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a kind of waveguide filters, are related to wireless communication technology field.It include first wave guide ring flange, second waveguide ring flange and fluting circular waveguide in the waveguide filter structure.Rectangular channel is provided on fluting circular waveguide side wall, the structure interior surface of cross-notching circular waveguide in the process easy to process carries out metal plating, while alleviating the quality of waveguide filter.The invention also discloses a kind of waveguide filter manufacturing methods, waveguide filter structure is integrally printed using nonmetallic materials by stereolithography 3-D printer, and metal plating is realized in the whole surfaces externally and internally of waveguide filter, without assembly and debugging while realizing accurate processing, manufacture efficiency is effectively improved.
Description
Technical field
The present invention relates to wireless communication technology field more particularly to a kind of waveguide filter and its manufacturing methods.
Background technique
With the development of wireless communication technique, modern advanced wireless electrical communication system needs the multi-functional microwave milli of high-performance
Metric wave device is to adapt to electromagnetic environment complicated and changeable.In these radio communications systems especially radio-frequency front-end receive-transmit system
In, traditional microwave and millimeter wave passive wave guide device, such as waveguide filter etc. has radio-frequency enabled diversification, radio frequency insertion
The advantages such as low and power capacity is big are lost, are one of the emphasis of researcher's concern.
The waveguide device of radio-frequency enabled complexity often has complicated three dimensional physical structure, using tradition machinery processing technology
When manufacturing these devices, needs a structure integrally splitting into multiple components, then process multiple components respectively, most
It ressembles again afterwards together.
In the technology of above-mentioned relative maturity, the rigging error that assembling process introduces will influence waveguide device to a certain extent
Performance, and need using a large amount of assembly fastener, such as screw and pin.In addition, wave guide made of traditional all-metal
Part weight is big, and redundancy structure material is more, is unfavorable for realizing communication system in many applications such as airborne, carrier-borne and aerospace
Miniaturization and lightness.
Summary of the invention
The main purpose of the present invention is to provide a kind of waveguide filter of wave and its manufacturing methods, it is intended to solve tradition and subtract material system
When making in technology using mechanical processing technique manufacture waveguide filter, the manufacturing and positioning errors of waveguide filter are big, device weight
Amount is big and redundancy structure material is more, and waveguide filter manual debugging etc. post-processes the technical issues of time-consuming.
To achieve the above object, first aspect of the embodiment of the present invention provides a kind of waveguide filter, the waveguide filter packet
It includes:
First wave guide ring flange, second waveguide ring flange and fluting circular waveguide；
The side wall of the fluting circular waveguide is provided with multiple perforative rectangular channels；
Several circular films are set in the internal cavity of the fluting circular waveguide, are provided with window on each circular film,
The internal cavity of the fluting circular waveguide is divided into multiple resonant cavities by several circular films；
It is described fluting circular waveguide one end connect with the first flange disk, it is described slot circular waveguide the other end with it is described
The connection of second flange disk.
Second aspect of the embodiment of the present invention provides a kind of waveguide filter manufacturing method, this method comprises:
The electronic model that waveguide filter is adjusted in stereolithography 3-D printer keeps the electronic model inclination certain
Angle, print original workpiece corresponding with the electronic model using nonmetallic materials using stereolithography 3-D printer；
Wherein, the original workpiece include: first wave guide ring flange, second waveguide ring flange and fluting circular waveguide, it is described
Original workpiece is the entirety that can not be split；
Solidify the original workpiece using ultraviolet light, and the original workpiece after solidification is placed in air blast electric dry oven
It is heat-treated, obtains the physical model of 3-D printing；
It metallizes on the surface of the physical model of 3-D printing, obtains the waveguide filter.
The embodiment of the present invention provides a kind of waveguide filter and its manufacturing method.Waveguide filter includes first wave guide flange
Disk, second waveguide ring flange and fluting circular waveguide.Perforative rectangular channel, process easy to process are provided on the side wall of fluting circular waveguide
The structure interior surface of middle cross-notching circular waveguide carries out metal plating, while alleviating the quality of waveguide filter.Waveguide filter
Structure is integrally printed using nonmetallic materials by stereolithography 3-D printer, and inside and outside the entirety of waveguide filter
Surface realizes metal plating, without assembly and debugging while realizing accurate processing, effectively improves manufacture efficiency.
Detailed description of the invention
It in order to illustrate the embodiments of the present invention more clearly or prior art, below will be to embodiment or prior art side
Attached drawing used in case is briefly described.It should be noted that the accompanying drawings in the following description is only some realities of the invention
Example is applied, to those skilled in the art, without creative efforts, can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is a kind of inclined shaft mapping of waveguide filter provided in an embodiment of the present invention；
Fig. 2 is a kind of cross-sectional view of waveguide filter provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of the waveguide flange of waveguide filter provided in an embodiment of the present invention；
Fig. 4 is a kind of flow diagram of waveguide filter manufacturing method provided in an embodiment of the present invention；
Fig. 5 is the scattering parameter curve that a kind of waveguide filter provided in an embodiment of the present invention is emulated and measured in X frequency range
Figure；
Fig. 6 is the passband S that a kind of waveguide filter provided in an embodiment of the present invention is emulated and measured in X frequency range21Parameter is bent
Line chart.
Specific embodiment
To enable objects, features and advantages of the present invention more obvious and easy to understand, below in conjunction with the embodiment of the present invention
In attached drawing, technical solution in the embodiment of the present invention carry out complete display describe.It should be noted that described real
Applying example is only a part of the embodiment of the present invention, and not all embodiments.Based on the embodiments of the present invention, those skilled in the art
Member's all other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the embodiment of the present invention, it is to be understood that term " upper surface ", " lower surface ", " left end ", " right side
The orientation or positional relationship of the instructions such as end ", " upside ", " downside ", " horizontal direction " and " vertical direction " is based on attached drawing institutes
The orientation or positional relationship shown is merely for convenience of the description embodiment of the present invention and simplifies description, and cannot regard as meaning
The element or device shown is specific orientation.
In the description of the embodiment of the present invention, given structure size is that preferred parameter is repaired referring to the embodiment of the present invention
The dimensional parameters for changing all parts can further obtain actually required performance.
Referring to Fig. 1, Fig. 1 is a kind of inclined shaft mapping of waveguide filter provided in an embodiment of the present invention.
First wave guide ring flange 1, second waveguide ring flange 2 and fluting circular waveguide 3.
Wherein, flange is part interconnected between waveguide mouth and waveguide mouth, for the connection between pipe end.And waveguide
Ring flange refers to by the flange that is fixed on waveguide terminal of setting, and it is mountable in order to be aligned with companion flange and clamping
Accessory.The size of first wave guide ring flange 1 and second waveguide ring flange 2 in the embodiment of the present invention is WR-112 under X frequency range
The section of standard rectangular waveguide flange size, first wave guide ring flange 1 and second waveguide ring flange 2 is rectangle.
Further, in electromagnetism and communication engineering, waveguide refers to the physics that electromagnetic energy is transmitted between its port
Structure, common guided wave structure mainly have parallel double conducting wire, coaxial line, parallel flat waveguide, rectangular waveguide, circular waveguide, micro-strip
Line and slab dielectric optical waveguide etc..From the point of view of conduction electromagnetic wave, above-mentioned waveguiding structure can all be divided into interior zone and outside
Region, electromagnetic wave, which is commonly bundled, is tied to interior zone propagation.In embodiments of the present invention, what is used is guided wave structure for circular waveguide,
The section of circular waveguide is circle, inside filling air.Further, the circular waveguide that side wall is provided with rectangular aperture is known as circle of slotting
Waveguide, i.e., circular waveguide 3 of slotting as shown in Fig. 1.Further, the section of fluting circular waveguide 3 is circle, circular waveguide 3 of slotting
Inside is the hollow cavity of cylindrical body, and the outside of hollow cavity is the side wall of fluting circular waveguide 3, two ends of fluting circular waveguide 3
Face has the input window or output window that shape is rectangle.
Further, the side wall of fluting circular waveguide 3 is provided with multiple perforative rectangular channels.
Further, several circular films are provided in the internal cavity of fluting circular waveguide 3, are opened on each circular film
There is window, the internal cavity for circular waveguide 3 of slotting is divided into multiple resonant cavities by several circular films.
Wherein, circular film is for size customization setting and integrated with waveguide filter cavity in waveguide filter entity
The material block of manufacture, it belongs to a part of filter cavity internal structure, and resonant cavity refers to two circles in fluting circular waveguide 3
The cavity area for including between shape diaphragm, or two cavity areas for including between end face and circular film of fluting circular waveguide 3
Domain.Each resonant cavity is filled with air in the entity of waveguide resonator, will pass through the electromagnetic wave of fluting circular waveguide 3 with the shape of standing wave
Formula is limited in the cavity of resonant cavity, and is played a part of storing electromagnetic wave energy and selected wave frequency.
Further, slot circular waveguide 3 side wall on open the purpose of rectangular channel and be: the first, to using stereolithography 3-D
When the physical model of the waveguide filter of printer printing carries out surface metal plating, electrostatic field can penetrate fluting circular waveguide 3
Slotted wall enter fluting 3 inner cavity of circular waveguide, convenient for slot 3 inner surface of circular waveguide metal on plate；The second, facilitate out
Foreign-plated plating solution swaps in 3 cavity of slot circular waveguide, reduces the bath concentration difference of fluting 3 different surfaces position of circular waveguide
With plating rate difference on metal.Third, the weight for reducing waveguide filter.
Further, slot circular waveguide 3 left end connect with first wave guide ring flange 1, fluting circular waveguide 3 right end and
Second waveguide ring flange 2 connects.
In embodiments of the present invention, waveguide filter includes first wave guide ring flange 1, second waveguide ring flange 2 and fluting
Circular waveguide 3, it is easy to process in the process in the structure of waveguide filter due to being provided with rectangular channel on the side wall of fluting circular waveguide 3
Surface carries out metal plating, while helping to mitigate the quality of waveguide filter.
Referring to Fig. 2, Fig. 2 is a kind of cross-sectional view of waveguide filter provided in an embodiment of the present invention；Wherein, Fig. 2 is edge
Observation is formed by cross-sectional view from front to back after the waveguide filter A-A ' section in Fig. 1.
Further, the rectangular channel on the side wall of waveguide filter, and, it is arranged in the internal cavity for circular waveguide 3 of slotting
Circular film different quantity can be set as according to the quantity of the resonant cavity of waveguide filter.Such as: when fluting circular waveguide 3
Internal cavity in the quantity of circular film that is arranged when being 1, then waveguide filter includes 2 cascade resonant cavities；When opening
When the quantity for the circular film being arranged in the internal cavity of slot circular waveguide 3 is 2, then waveguide filter includes 3 cascade humorous
Shake chamber.In embodiments of the present invention for including the waveguide filter of 4 cascade resonators, the structure of waveguide filter is described
At the structure setting class of the waveguide filter of the waveguide filter structure setting and 4 cascade resonators of remaining quantity resonant cavity
Seemingly, with details are not described herein again.
Such as Fig. 2, the cylindrical structure that circular waveguide 3 is inner hollow of slotting, the electromagnetic wave of input is limited in fluting circle wave
Lead 3 interior zone propagate, slot 3 side wall of circular waveguide on all flutings with fluting 3 medial surface current parallel of circular waveguide, because
This will not generate radiation.The sidewall thickness of fluting circular waveguide 3 is twall, twallIt is 4.000 millimeters, the length for circular waveguide 3 of slotting
Are as follows: 124.000 millimeters.
Further, it is rectangle that first wave guide ring flange 1, which is provided with section to the second end face on its opposite from first end face,
Waveguide port, electromagnetic wave input or output port as waveguide filter, since the section of waveguide port is rectangle, so wave
The broadside and two narrow sides being parallel to each other that there are two the section tools for leading port is parallel to each other, while in 3 inside of circular waveguide of slotting
The first port of empty part and the section of second port are also rectangle, so first port and second port also have, there are two mutually
Parallel broadside and two narrow sides being parallel to each other.Further, the of waveguide port and fluting 3 interior hollow section of circular waveguide
Single port is connected, and two broadsides in the section of waveguide port, is respectively parallel to the first of fluting 3 interior hollow section of circular waveguide
Two broadsides of port, two narrow sides in the section of waveguide port are respectively parallel to the of fluting 3 interior hollow section of circular waveguide
Two narrow sides of Single port, the length of the broadside of waveguide port are a, and a is 28.449 millimeters, and the length of the narrow side of waveguide port is
B, b are 12.624 millimeters.The length of the broadside in the first port section of fluting 3 interior hollow section of circular waveguide is a1, a1For
17.564 millimeters, the length of the narrow side in the first port section for 3 interior hollow section of circular waveguide of slotting is b1, b1For 6.600 millis
Rice.
Further, it is rectangle that second waveguide ring flange 2, which is provided with section to the second end face on its opposite from first end face,
Waveguide port, electromagnetic wave input or output port as waveguide filter, waveguide port and fluting 3 internal void of circular waveguide
The second port divided is connected, and two broadsides in the section of waveguide port, is respectively parallel to fluting 3 interior hollow section of circular waveguide
Second port two broadsides, two narrow sides in the section of waveguide port, be respectively parallel to fluting 3 internal void of circular waveguide
Two narrow sides of the second port being divided to, the length of the broadside of waveguide port are a, and a is 28.449 millimeters, the narrow side of waveguide port
Length is b, and b is 12.624 millimeters.The length of the broadside in the second port section of fluting 3 interior hollow section of circular waveguide is a1,
a1It is 17.564 millimeters, the length of the narrow side in the second port section for 3 interior hollow section of circular waveguide of slotting is b1, b1For
6.600 millimeter.
Further, slot circular waveguide 3 internal cavity by first wave guide ring flange 1 towards second waveguide ring flange 2
Direction is arranged altogether there are three circular film, successively are as follows: the first circular film 4, the second circular film 5 and third circular film 6.
Further, the quantity of the resonant cavity of waveguide filter is four, and four resonant cavities are concatenated together, by first wave
The direction for leading ring flange 1 towards second waveguide ring flange 2 be respectively as follows: the first resonant cavity, the second resonant cavity, third resonant cavity and
4th resonant cavity, adjacent resonant cavity are separated by a circular film.Such as: the first resonant cavity and the second resonant cavity are by first
Circular film 4 separates.The length of first resonant cavity are as follows: 28.707 millimeters, the length of the second resonant cavity are as follows: 32.738 millimeters,
The length of third resonant cavity are as follows: the length of 32.738 millimeters and the 4th resonant cavity are as follows: 28.707 millimeters.
Further, the side wall of each resonant cavity includes equidistant multi-turn rectangular channel, all in each circle rectangular channel
The setting of rectangular channel interval pre-determined distance.In embodiments of the present invention, the notch of the rectangular channel on the side wall of fluting circular waveguide 3 is
Rectangle, the side wall of each resonant cavity include five circle rectangular channels, the structure centre point of two neighboring rectangular channel in each circle rectangular channel
With fluting circular waveguide 3 internal cavity central axes structure in angle of 45 degrees, namely: each circle rectangular channel include eight rectangular channels
7.The broadside of the notch of all rectangular channels is long are as follows: and 6.000 millimeters, the length of narrow side are as follows: 1.500 millimeters.
Further, the slotting length of each rectangular channel 7 be oriented parallel to fluting 3 side wall of circular waveguide face it is tangential, and
Perpendicular to the axial direction of the internal cavity of fluting circular waveguide 3.All rectangular channels 7 be open towards fluting circular waveguide 3 internal cavity,
And opening is tangential towards the face perpendicular to fluting 3 side wall of circular waveguide.Centerline axis pair of all rectangular channels 7 about waveguide filter
Claim, and symmetrical about waveguide filter integral central.
Further, the slotting length direction of all rectangular channels 7 is each parallel to the face in fluting 3 side wall inner surfaces of circular waveguide
Current direction, the surface current are that the electromagnetic wave due to propagating in fluting circular waveguide 3 incudes generation on fluting 3 inner wall of circular waveguide
's.Surface current distribution is not cut and is destroyed in the fluting direction of rectangular channel 7 on fluting circular waveguide 3, therefore will not cause electricity
Magnetic radiation.The depth for the rectangular channel 7 slotted on circular waveguide 3 is identical as the fluting side wall thickness of circular waveguide 3, so fluting circular waveguide
The depth of rectangular channel 7 on 3 is 4.000 millimeters.
Further, the radius of each resonant cavity is 12.250 millimeters, in each resonant cavity mutually just there are two
The mode of electromagnetic wave of two kinds of degeneracys on the direction of friendship, the resonance frequency of every kind of mode of electromagnetic wave are by fluting circular waveguide 3
The internal diameter and length of inner hollow cavity determine.If the internal diameter and length of the inner hollow cavity for circular waveguide 3 of slotting determine, opening
Before any resonance frequency tunings pillar or other similar functionality perturbed structures are not added in the inner hollow cavity of slot circular waveguide 3
It puts, the resonance frequency of two kinds of mode of electromagnetic waves on above-mentioned two mutually orthogonal direction is identical.
Further, on the side wall of each resonant cavity along two mutually orthogonal directions respectively to fluting circular waveguide 3
Internal cavity be arranged two frequency tuning columns, wherein two frequency tuning columns of first resonant cavity are respectively as follows: first frequency
It tunes column 8 and second frequency tunes column 9.Column 8 is tuned by control first frequency and second frequency tunes column 9 into resonant cavity
The radius of the length and pillar itself that protrude into can tune two kinds of electricity in first resonant cavity on two mutually orthogonal directions
The resonance frequency of magnetic wave mode.Similarly, it is protruded by controlling two frequency tuning columns in other resonant cavities into resonant cavity
Length, the resonance frequency of two kinds of mode of electromagnetic waves in respective resonant cavity on two mutually orthogonal directions can be tuned.For
Simplicity of exposition, first frequency tuning column 8 and second frequency tuning column 9 may refer to corresponding in remaining resonant cavity in the following contents
The frequency tuning column of position.
Further, two mutually orthogonal directions are respectively parallel to port and the second flange disk 2 of first flange disk 1
The broadside and narrow side of port.Since the top surface radius of two frequency tuning columns in each resonant cavity is 1.450 millimeters, so
Two kinds of electromagnetism in the case where the top surface area of frequency tuning column determines, in each resonant cavity on two mutually orthogonal directions
The resonance frequency of wave mode can be controlled separately with the length of the two frequency tuning columns.Specifically, frequency tuning
The length of column is longer, then the resonance frequency of the corresponding mode of electromagnetic wave of frequency tuning column is lower.
Further, the length of the first frequency tuning column 8 in the first resonant cavity is 2.977 millimeters, second frequency tuning
The length of column 9 is 3.969 millimeters；The length of first frequency tuning column 8 in second resonant cavity is 2.803 millimeters, second frequency
The length for tuning column 9 is 2.893 millimeters；In third resonant cavity first frequency tuning column 8 length be 2.803 millimeters, second
The length of frequency tuning column 9 is 2.893 millimeters；The length of first frequency tuning column 8 in 4th resonant cavity is 2.977 millimeters,
The length that second frequency tunes column 9 is 3.969 millimeters.
Further, in the side wall of each resonant cavity from the horizontal by the direction of 45 degree of angles or minus 45 degree of angles,
One coupling adjustable column is set to the internal cavity of fluting circular waveguide 3, wherein the coupling adjustable column in the first resonant cavity is coupling
Adjustable column 10.Adjustable column 10 is coupled for realizing the coupling of two degeneracy mode of electromagnetic waves on above-mentioned two mutually orthogonal direction
It closes, the length that stiffness of coupling can protrude into resonant cavity cavity by adjusting coupling adjustable column 10 is controlled.Specifically, coupling
The length protruded into for closing adjustable column 10 is longer, and the stiffness of coupling between two degenerate modes on two mutually orthogonal directions is got over
Greatly.For simplicity of exposition, couple adjustable column 10 may refer to the coupling adjusting of corresponding position in remaining resonant cavity in the following contents
Column.
Further, the length of the coupling adjustable column 10 in the first resonant cavity are as follows: 5.155 millimeters；In second resonant cavity
Couple the length of adjustable column 10 are as follows: 4.220 millimeters；The length of coupling adjustable column 10 in third resonant cavity are as follows: 4.220 millimeters；
The length of coupling adjustable column 10 in 4th resonant cavity are as follows: 5.155 millimeters.
Further, it is from the horizontal by 45 degree of angles or minus 45 degree of folders that adjustable column 10 is coupled in each resonant cavity
Angle depends on the quantity of transmission zero and position in waveguide filter.In embodiments of the present invention, it couples and adjusts in the first resonant cavity
Segmented column 10 is from the horizontal by the direction of minus 45 degree of angles, and coupling adjustable column 10 is from the horizontal by 45 degree folders in the second resonant cavity
The direction at angle, direction of the coupling adjustable column 10 from the horizontal by minus 45 degree of angles, coupling in the 4th resonant cavity in third resonant cavity
Adjustable column 10 is closed from the horizontal by the direction of 45 degree of angles.It, can be according to transmission zero in waveguide filter under actual conditions
Quantity and position, flexible setting couple adjustable column 10 be from the horizontal by 45 degree of angles or minus 45 degree of angles.
Further, slot circular waveguide 3 internal cavity by first wave guide ring flange 1 towards second waveguide ring flange 2
Direction is arranged altogether there are three circular film, the thickness of each circular film are as follows: and 1 millimeter, the shape of the window on each circular film
Shape is cross or rectangle.
Further, the coupling of the mode of electromagnetic wave in adjacent resonators is realized by the window on circular film.Such as:
The coupling of two kinds of mode of electromagnetic waves in first resonant cavity and two kinds of mode of electromagnetic waves in the second resonant cavity is round by first
The cross window of diaphragm 4 is realized.Since the direction of two kinds of mode of electromagnetic waves in each resonant cavity is two mutually orthogonal
Direction, and two mutually orthogonal directions are parallel to the port of first flange disk 1 and the port of second flange disk 2 respectively
Broadside and narrow side.So the opening direction of cross window or rectangular window on circular film must be with fluting circular waveguide 3
The direction of the electromagnetic wave port of input or output is consistent, and the mode of electromagnetic wave in adjacent resonators could be coupled effectively.
Such as: if the window shape on circular film is cross, cross window is made of two orthogonal rectangles, then cross window
The one of rectangle of mouth is whole parallel with the broadside of the first port of fluting circular waveguide 3 or second port, in cross window
Another rectangle it is whole parallel with the narrow side of the first port for circular waveguide 3 of slotting or second port.If on circular film
Window shape is rectangle, then rectangular window is parallel with the broadside of the first port of fluting circular waveguide 3 or second port, Huo Zheyu
The first port of fluting circular waveguide 3 or the narrow side of second port are parallel.
Such as: if the window shape of circular film is cross, there are two on cross rectangles to be respectively used to couple
Two kinds of parallel mode of electromagnetic waves of direction of an electric field are corresponded in two adjacent resonators, wherein each rectangular window coupled two
Two kinds of mode of electromagnetic waves in a adjacent resonators meet electric field perpendicular to the broadside of rectangular window.If the window-shaped of circular film
Shape is rectangle, then rectangular window be only used for coupling two adjacent resonators in direction of an electric field perpendicular to the two of rectangular window broadside
Kind mode of electromagnetic wave.
Further, head and the tail two resonant cavities i.e. the first resonant cavity and the 4th resonant cavity, the input coupling with waveguide port
The first port and second port for passing through fluting circular waveguide 3 respectively with output coupling are realized.By controlling circular film cross
In shape window in the size of two rectangles or circular film rectangular window size, between adjustable two neighboring resonant cavity
Mode of electromagnetic wave stiffness of coupling, in conjunction in each resonant cavity to coupling adjustable column 10 length control, can set
The adjusting of filter bandwidht is realized in meter.Pass through the size of the first port of control fluting circular waveguide 3 and the ruler of second port
It is very little, it can control the input coupling intensity and output coupling intensity of head and the tail two resonant cavities and waveguide port.Specifically, circular membrane
The window area of on piece is bigger, and the length for coupling adjustable column 10 is bigger, then the stiffness of coupling between mode of electromagnetic wave is bigger, waveguide
Filter bandwidht is bigger；The first port area and second port area of fluting circular waveguide 3 are bigger, then corresponding head and the tail two are humorous
The input coupling intensity and output coupling intensity of vibration chamber and waveguide port are bigger.
Further, on three circular films between four resonant cavities window shape can be rectangle or cross, can
The flexible design with the frequency response according to waveguide filter transfer function.
Further, the window shape of the first circular film 4 is cross, and the window shape of the second circular film is square
Shape, the window shape of third circular film are cross.Specifically, longitudinal moment in the cross window on the first circular film 4
The length of shape and it is wide be respectively as follows: 14.760 millimeters and 4.007 millimeters, lateral rectangle in the cross window on the first circular film 4
Length and wide be respectively as follows: 8.551 millimeters and 3.341 millimeters；The length and width of rectangular window on second circular film are respectively as follows:
14.500 millimeter and 2.891 millimeters；The length of longitudinal rectangle and width are respectively as follows: in cross window on third circular film
14.760 millimeters and 5.226 millimeters, the length of lateral rectangle and width are respectively as follows: in the cross window on the first circular film 4
11.600 millimeter and 3.383 millimeters.
Referring to Fig. 3, Fig. 3 is a kind of structural representation of the waveguide flange of waveguide filter provided in an embodiment of the present invention
Figure.
As shown in figure 3, first wave guide ring flange 1 and second waveguide ring flange 2 are containing there are four the through-holes of axial symmetry distribution
11, through-hole 11 is connect for this waveguide filter with other waveguide assemblies under the auxiliary of the fasteners such as screw.Ring flange it is detailed
Thin size and lead to the hole site are referring to the WR-112 ring flange and through-hole parameter in national standard code BJ84 standard.
Further, first wave guide ring flange 1, second waveguide ring flange 2 and fluting circular waveguide 3 are made using nonmetallic materials
For structural material, integrally printed by 3-D printer.Nonmetallic materials can use photosensitive resin, plastics, nylon and pottery
The nonmetallic materials such as porcelain, it is preferred to use ceramic photosensitive resin is integrally beaten as structural material, by stereolithography 3-D printer
It prints.Ceramic photosensitive resin has the advantage that density is small, more photosensitive than common with stereolithography 3-D printer good compatibility
Resin mechanical strength is higher, and heat resistance is more preferable and thermal expansion coefficient is smaller.Use ceramic photosensitive resin as waveguide filter
The purpose of structural material be: on the one hand, can satisfy in practical engineering application to the mechanical strength of waveguide filter and temperature
Demand；On the other hand, under the premise of not sacrificing waveguide filter radio-frequency performance, waveguide filter can be greatly reduced
Quality.
In a kind of waveguide filter provided in an embodiment of the present invention, waveguide filter includes first wave guide ring flange, second
Waveguide flange and fluting circular waveguide, are integrally machined molding using 3-D printing technique.It is arranged in fluting circular waveguide internal cavity
There are several circular films, fluting circular waveguide internal cavity is divided into multiple resonant cavities.By the window ruler that circular film is arranged
Very little, between adjustable two neighboring resonant cavity mode of electromagnetic wave stiffness of coupling passes through the input terminal of setting fluting circular waveguide
The input coupling intensity and output coupling of the size of mouth and output port, two resonant cavities of adjustable head and the tail and waveguide port are strong
Degree.In addition, may be implemented two in each resonant cavity by the length for designing two frequency tuning columns on each resonant cavity side wall
The tuning of the resonance frequency of two kinds of mode of electromagnetic waves on a mutually orthogonal direction；On side wall by designing each resonant cavity
The length for coupling adjustable column, may be implemented the coupling of two kinds of mode of electromagnetic waves in each resonant cavity on two mutually orthogonal directions
Close the adjusting of intensity.Waveguide filter structure uses low-density and heat-resist ceramic photosensitive resin High Precision Stereo photoetching
3-D printer integrally prints, and without assembly and debugging while realizing accurate processing, and effectively improves manufacture
Efficiency, potential realization small lot quickly produce, and manufacture material can satisfy conventional project using the heatproof to waveguide device
Demand.
Referring to Fig. 4, Fig. 4 is a kind of flow diagram of waveguide filter manufacturing method provided in an embodiment of the present invention.
As shown in figure 4, the flow chart includes:
S101, in stereolithography 3-D printer adjust waveguide filter electronic model placement angle, make electronic die
Type tilts certain angle, prints original corresponding with electronic model using nonmetallic materials using stereolithography 3-D printer
Beginning workpiece.
Wherein, original workpiece includes: first wave guide ring flange, second waveguide ring flange and fluting circular waveguide, original workpiece
The entirety that can not be split for one；
Wherein, it by the electronic model of reasonable placement waveguide filter, is allowed to be tilted a certain angle, to make stereolithography
Waveguide filter inside cavity generates backing material as few as possible during 3-D printer printing waveguide filter, and produces
Raw backing material is easy to be removed, in embodiments of the present invention, by the way that suitable tilt angle is arranged, so that only at three
There is a small amount of backing material to generate at the cross or rectangular window of circular film, and these backing materials can be in post-processing work
It is completely removed in skill.
Further, the electronic model of waveguide filter is the waveguide designed according to the design principle of foregoing invention embodiment
The threedimensional electronic model of filter.
Further, first wave guide ring flange, second waveguide ring flange and fluting circular waveguide use nonmetallic materials as
Structural material is integrally printed by 3-D printer.Nonmetallic materials can use photosensitive resin, plastics, nylon and ceramics
Etc. nonmetallic materials, it is preferred to use ceramic photosensitive resin passes through stereolithography 3-D printer and integrally prints as structural material
It forms.Ceramic photosensitive resin has the advantage that density is small, and stereolithography 3-D printer good compatibility, than common photosensitive tree
Rouge mechanical strength is higher, and heat resistance is more preferable and thermal expansion coefficient is smaller.Use ceramic photosensitive resin as waveguide filter
The purpose of structural material is: on the one hand, can satisfy in practical engineering application to the mechanical strength of waveguide filter and temperature
Demand；On the other hand, under the premise of not sacrificing waveguide filter radio-frequency performance, the matter of waveguide filter can be greatly reduced
Amount.
Further, using technical grade stereolithography 3-D printer, the landscape orientation of stereolithography 3-D printer is differentiated
Rate are as follows: 1 micron × 1 micron, longitudinal print resolution, i.e. printed material stack thickness and be set as 50 microns.Stereolithography 3-D
After printer completes print out task, original workpiece is taken out, following subsequent processing is carried out to original workpiece.
S102, using ultraviolet light solidify original workpiece, and by the original workpiece after solidification be placed in air blast electric dry oven into
Row heat treatment, obtains the physical model of 3-D printing.
Wherein, include: using the specific steps that ultraviolet light solidifies original workpiece
Curing molding for the first time is carried out to original workpiece using ultraviolet laser in stereolithography 3-D printer.
Further, chemical cleaning and physical cleaning are carried out to original workpiece.Original workpiece is placed in of short duration leaching in acetone
Bubble wipes original workpiece surface with wool brush, dissolves the uncured resin on original workpiece surface, then is placed in clean acetone clear
It washes, repeatedly, until original workpiece surface is without uncured resin residue.
Further, the cleaning agent on original workpiece surface is dried up, with compressed air to reach preliminarily dried original workpiece
Purpose.
Further, using the original workpiece after ultraviolet curing, method particularly includes: by the original after preliminarily dried
Beginning workpiece is placed in UV cure lamp case, and drying and curing 30 minutes.The purpose is to thoroughly dry the interior appearance of original workpiece
Face, and promote the mechanical strength of resin.
Further, after using ultraviolet light solidification original workpiece further include:
Original workpiece after solidification is subjected to blasting treatment, and the original workpiece after blasting treatment is subjected to manual polishing.
Wherein, the original workpiece after solidification is subjected to blasting treatment method particularly includes:
Workpiece after dry solidification is placed in sand-blasting machine, preferred sandblasting air pressure is 40psi, using No. 800 Limbra Stones,
Comprehensive blasting treatment is carried out to original workpiece.The purpose of this step is removal original workpiece resin impurity remained on surface.
Further, the original workpiece after blasting treatment is subjected to manual polishing method particularly includes:
First with No. 400 sand paper rough grinding original workpiece surfaces, surface pattern is removed, adds water to beat with No. 600 sand paper again later
The surface of mill original workpiece finally adds crystal carefully to polish to improve original workpiece surface smoothness with No. 1000 sand paper, final
To the resin surface of smooth exquisiteness.
Further, the original workpiece after solidification is placed in the specific method being heat-treated in air blast electric dry oven includes:
Original workpiece after fine polishing is placed in air blast electric dry oven, heat treatment parameter is set are as follows: from room in 2 hours
Temperature is warmed to 160 DEG C, keeps the temperature 2 hours under 160 DEG C of air environment later, finally from 160 DEG C of cooled to room temperatures.At heat
The purpose of reason is to increase the toughness and heat resistance of resin.
S103, it metallizes on the surface of the physical model of 3-D printing, obtains waveguide filter.
The specific steps to metallize to the surface of original workpiece include:
Chemical roughening and chemical activation are carried out to resin surface, and one layer of nickel of chemical plating, as seed layer, nickel layer thickness is about
It is 100 nanometers.
Further, the electro-coppering on nickel layer, copper layer thickness are 10 microns, finally obtain waveguide filter.
Fig. 5 and Fig. 6 are please referred to, Fig. 5 is that a kind of waveguide filter provided in an embodiment of the present invention is emulated and measured in X frequency range
Scattering parameter curve graph, Fig. 6 be a kind of waveguide filter provided in an embodiment of the present invention X frequency range emulate with measure it is logical
Band S21Parametric plot.
As shown in Figure 5 and Figure 6, right in order to prove the excellent radio-frequency performance of X frequency range waveguide filter in the embodiment of the present invention
The scattering parameter of the waveguide filter is emulated and has been measured.As can be seen that the waveguide manufactured by foregoing invention embodiment
Filter realizes desired quasi-elliptic function filter response, and free transmission range is 8.01-8.44GHz, and pass band insertion loss is
0.32-0.68dB, passband return loss are better than 10dB, and passband central frequency is compared with simulation value to low frequency offset 13.1MHz (phase
It is about 0.16%) to frequency shift (FS).The filter quality of integrated increasing material manufacturing is 111 grams, and without assembly and any fastening
Part, test process is without manual debugging.Simultaneously it has been also found that notching construction does not produce the passband radio-frequency performance of waveguide filter
Raw significant impact.
In embodiment provided by the present invention, it should be understood that disclosed structure and processing method can pass through it
Its mode is realized.For example, waveguide filter example structure described above is only schematical, for example, fluting
The size of notch size and circular film, only a kind of achievable physical structure, can follow setting for filter in practice
Meter principle is designed as other reasonable sizes.In addition, the processing of waveguide filter can also using other resin materials or its
Its increases material manufacturing technology is realized, can select suitable 3-D printed material and 3-D printer according to the demand of practical application.
The above are the descriptions to a kind of waveguide filter provided by the present invention and its manufacturing method, for the skill of this field
Art personnel, thought according to an embodiment of the present invention, there will be changes in the specific implementation manner and application range.To sum up,
The contents of this specification are not to be construed as limiting the invention.
Claims (10)
1. a kind of waveguide filter, which is characterized in that the waveguide filter includes:
First wave guide ring flange, second waveguide ring flange and fluting circular waveguide；
The side wall of the fluting circular waveguide is provided with multiple perforative rectangular channels；
Several circular films are set in the internal cavity of the fluting circular waveguide, window is provided on each circular film, it is described
The internal cavity of the fluting circular waveguide is divided into multiple resonant cavities by several circular films；
One end of the fluting circular waveguide is connect with the first flange disk, the other end and described second of the fluting circular waveguide
Ring flange connection.
2. waveguide filter according to claim 1, which is characterized in that the side wall of each resonant cavity includes by described
The equidistant rectangular channel of multi-turn that first flange disk is arranged towards second flange disk direction, it is each to enclose owning in rectangular channel
The setting of rectangular channel interval pre-determined distance.
3. waveguide filter according to claim 2, which is characterized in that on the inner sidewall of each resonant cavity along
Two frequency tuning columns are arranged to the internal cavity of the fluting circular waveguide respectively in two mutually orthogonal directions；
Described two mutually orthogonal directions be respectively parallel to the first flange disk port or the second flange disk
The broadside and narrow side of port.
4. waveguide filter according to claim 3, which is characterized in that in the inner sidewall and level of each resonant cavity
Direction is in angle of 45 degrees or the direction of minus 45 degree of angles, internal cavity one coupling of setting to the fluting circular waveguide are adjusted
Column.
5. waveguide filter according to claim 4, characteristic value are, the shape of the window on the circular film is
Cross or rectangle；
The port of the port or second flange disk of the opening direction of the cross or rectangle and the first flange disk
Direction is consistent.
6. waveguide filter according to claim 5, which is characterized in that the first wave guide ring flange from first end face to
The second end face on its opposite is provided with the waveguide port that section is rectangle, the waveguide port and the fluting circular waveguide inner hollow
Partial first port is connected；
The second waveguide ring flange is provided with the waveguide port that section is rectangle, institute from first end face to the second end face on its opposite
Waveguide port is stated to be connected with the second port of the fluting circular waveguide interior hollow section.
7. according to claim 1 to waveguide filter described in 6 any one, which is characterized in that the first wave guide ring flange
Contain multiple screw holes with the second waveguide ring flange；
The first wave guide ring flange, the second waveguide ring flange and the fluting circular waveguide use nonmetallic materials as
Structural material, by stereolithography 3-D printer, integrally printing is made.
8. a kind of waveguide filter manufacturing method, which is characterized in that the method is for any one of manufacturing claims 1 to 7 institute
The waveguide filter stated, which comprises
The placement angle that the electronic model of waveguide filter is adjusted in stereolithography 3-D printer, makes the electronic model incline
Tiltedly certain angle uses nonmetallic materials to print corresponding with the electronic model using the stereolithography 3-D printer
Original workpiece；
Wherein, the original workpiece include: first wave guide ring flange, second waveguide ring flange and fluting circular waveguide, it is described original
Workpiece is the entirety that can not be split；
Solidify the original workpiece using ultraviolet light, and the original workpiece after solidification is placed in air blast electric dry oven and is carried out
Heat treatment obtains the physical model of 3-D printing；
It metallizes on the surface of the physical model of 3-D printing, obtains the waveguide filter.
9. according to the method described in claim 8, it is characterized in that, described include: using the ultraviolet light solidification original workpiece
Curing molding for the first time is carried out to the original workpiece using ultraviolet laser in the stereolithography 3-D printer；
The original workpiece after molding is subjected to chemical cleaning and physical cleaning, and dry completion chemical cleaning and physical cleaning
The original workpiece afterwards；
The original workpiece after ultraviolet light again curing and drying is used in ultraviolet light lamp box.
10. according to the method described in claim 9, it is characterized in that, after the original workpiece using ultraviolet light solidification
Further include:
The original workpiece after solidification is subjected to blasting treatment, and the original workpiece after blasting treatment beat by hand
Mill.
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| CN201811003085.3A CN109149038A (en) | 2018-08-30 | 2018-08-30 | Waveguide filter and its manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811003085.3A CN109149038A (en) | 2018-08-30 | 2018-08-30 | Waveguide filter and its manufacturing method |
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Cited By (5)
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| CN110011014A (en) * | 2019-04-26 | 2019-07-12 | 深圳大学 | Waveguide filter and its manufacturing method |
| CN110265785A (en) * | 2019-05-31 | 2019-09-20 | 深圳大学 | Spherical cavity antenna radiator and its manufacturing method |
| CN111641011A (en) * | 2020-06-05 | 2020-09-08 | 深圳大学 | Metal waveguide array and regulating device using same |
| CN111987396A (en) * | 2019-05-24 | 2020-11-24 | 波音公司 | Radio frequency filter device and method of manufacturing a radio frequency filter |
| CN112823445A (en) * | 2019-07-15 | 2021-05-18 | 瑞士十二公司 | Waveguide filter suitable for additive manufacturing method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011014A (en) * | 2019-04-26 | 2019-07-12 | 深圳大学 | Waveguide filter and its manufacturing method |
| CN110011014B (en) * | 2019-04-26 | 2020-11-13 | 深圳大学 | Waveguide filter and method of manufacturing the same |
| CN111987396A (en) * | 2019-05-24 | 2020-11-24 | 波音公司 | Radio frequency filter device and method of manufacturing a radio frequency filter |
| CN111987396B (en) * | 2019-05-24 | 2023-12-19 | 波音公司 | Radio frequency filter device and method of manufacturing radio frequency filter |
| CN110265785A (en) * | 2019-05-31 | 2019-09-20 | 深圳大学 | Spherical cavity antenna radiator and its manufacturing method |
| CN112823445A (en) * | 2019-07-15 | 2021-05-18 | 瑞士十二公司 | Waveguide filter suitable for additive manufacturing method |
| CN112823445B (en) * | 2019-07-15 | 2022-09-16 | 瑞士十二公司 | Method for manufacturing waveguide filter and waveguide filter |
| CN111641011A (en) * | 2020-06-05 | 2020-09-08 | 深圳大学 | Metal waveguide array and regulating device using same |
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