CN107946704B - A kind of bimodulus dielectric filter - Google Patents
A kind of bimodulus dielectric filter Download PDFInfo
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- CN107946704B CN107946704B CN201711072319.5A CN201711072319A CN107946704B CN 107946704 B CN107946704 B CN 107946704B CN 201711072319 A CN201711072319 A CN 201711072319A CN 107946704 B CN107946704 B CN 107946704B
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- coupling line
- coupling
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- resonator
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Classifications
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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
- H01P1/2002—Dielectric waveguide filters
-
- 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
Abstract
The present invention relates to the electronic components in the communications field, more particularly, to a kind of bimodulus dielectric filter.The filter, including cavity and cover board, it is intracavitary in one of them to be equipped with the metal resonators that generate a resonance frequency two neighboring interior intracavitary, it is intracavitary in another to be equipped with the dielectric resonator that generate two resonance frequencies；It is equipped with the first coupling line between metal resonators and dielectric resonator, the second coupling line is equipped between dielectric resonator and dielectric resonator.Two degenerate mode resonance frequencies are generated by dielectric resonator, two chambers can be played the role of in filter, therefore under identical index, can significantly reduce size；Two degenerate mode resonance frequencies by medium block two adjacent side length independent controls, coupling amount between two degenerate modes is controlled by the length of corner cut size of medium block, the outer dimension of control medium block can be passed through, the electric parameter of accurate control filter, to guarantee the consistency of batch, debug time is reduced.
Description
Technical field
The present invention relates to the electronic components in the communications field, more particularly, to a kind of bimodulus dielectric filter.
Background technique
Requirement recently as high-performance and miniaturization to communication equipment is increasing, and bimodulus dielectric filter is more next
More it is taken seriously.But bimodulus dielectric filter before mostly uses cylindrical resonator, and gets through hole debugging on the resonator.
The shortcomings that this scheme, is to need to punch on dielectric material, it is well known that and ceramic material hardness is high, and does not have ductility,
Therefore through-hole is accurately processed in the method that ceramic surface can not pass through cutting as metal, realizes through-hole at present,
It can only first punch, then carry out around knot, but during sintering on green compact before ceramic post sintering, since ceramics can be shunk, make
The lead to the hole site precision and diameter accuracy that must be eventually formed all not can guarantee.To influence consistency when batch production.
Summary of the invention
In order to solve the above problem, the present invention provides a kind of bimodulus dielectric filter, the bimodulus dielectric filter structure is simple,
Processing and fabricating is convenient, and the electric parameter that filter design can be effectively ensured accurately is realized there is good consistency.
The technical solution adopted by the present invention is that: a kind of bimodulus dielectric filter, including cavity, Gai He with several inner cavities
Cover board on cavity, and be mounted on the interior intracavitary metal resonators for generating a resonance frequency and generate two degeneracys
The dielectric resonator of mould resonance frequency, it is characterised in that: the dielectric resonator is the medium block of a cuboid or square,
Described two degenerate mode resonance frequencies are respectively by the size of the first side of medium block adjacent orthogonal and second side independence
Control is equipped with the first coupling line between the first side and metal resonators of the dielectric resonator, the dielectric resonator
The second coupling line is equipped between second side and another adjacent interior intracavitary dielectric resonator.
Preferably, described two degenerate mode resonance frequencies are big by first side top and second side top side length respectively
Small independent control.
Further, the seamed edge of a seamed edge corner cut of the medium block, the corner cut is located at first side and second side
The opposite side of seamed edge is intersected in face, and the coupling amount between described two degenerate modes is cut away the volume size control of medium by the corner cut of medium block
System.
Further, it is in 45 degree of constant angles that the direction of the corner cut, which is with corresponding edge, between described two degenerate modes
Coupling amount is controlled by edge lengths in the corner cut of medium block.
Further, it is set in the cavity there are four inner cavity, intracavitary be equipped with generates a resonance frequency in two of them
Metal resonators, it is intracavitary in other two to be equipped with the dielectric resonator for generating two degenerate mode resonance frequencies.
Further, first coupling line one end and the disk edge of metal resonators connect, the other end and cover board
Connection；The position for controlling the first coupling line Yu adjacent media resonator adjusts cross-linked size and polarity.
Further, second coupling line both ends are connect with cover board, the second coupling line of control and adjacent media resonance
The position of device adjusts cross-linked size and polarity.
Further, first coupling line and the second coupling line are the U-shaped bending metal wire of opening upwards, described the
The bottom of one coupling line and the second coupling line is equipped with convex block, and bottom is equipped with the coupling line pedestal of insulation in the cavity, described
Coupling line pedestal is equipped with the groove cooperated with convex block, determines the cooperation position of groove and convex block, determines coupling line and adjacent Jie
The position of matter resonator.
Further, the disk of the metal resonators be equipped with input tap structure, the tap structure include by
Upper plastic spacer, tap piece and the lower plastic spacer being successively set under between the disk of metal resonators and cavity, institute
Plastic spacer, tap piece and lower plastic spacer is stated to be fixed between the disk of metal resonators and cavity by plastic screw.
Further, the coupled structure between the metal resonators and dielectric resonator and dielectric resonator and Jie
Coupled structure between matter resonator, and the tap structure of input, form one-piece parts by Shooting Technique.
A kind of bimodulus dielectric filter closes the cover board on cavity, and installation including cavity, lid with several inner cavities
Metal resonators and dielectric resonator in the inner cavity, it is characterised in that: the dielectric resonator is arranged to square, definition
The dielectric resonator relevant to the metal resonators is the first side on one side, defines phase between two dielectric resonators
What is closed is the second side on one side, and the first coupling line traffic control resonance frequency between the two is equipped between the metal resonators and the first side
Coupling amount, the coupling of the second coupling line traffic control resonance frequency between the two is equipped between the second side of two dielectric resonators
Resultant.
Preferably, on the dielectric resonator with first while and second while opposite both sides be defined as third side and the 4th
Side, the third while and the angle that connects and composes of the 4th while be arranged to corner cut, the length control third of the corner cut at the 4th between
The coupling amount of resonance frequency.
The beneficial effect that the present invention obtains is: two degenerate mode resonance frequencies is generated by dielectric resonator, in filter
In can play the role of two chambers, therefore under identical index, which can significantly reduce size；Two
A degenerate mode resonance frequency is by two adjacent side length independent controls of medium block, and the coupling amount between two degenerate modes is by being situated between
The length of corner cut size of mass controls, and when production, can pass through the outer dimension of control medium block, the accurate electricity for controlling filter
Gas parameter reduces debug time to guarantee the consistency of batch, improves production efficiency；Metal resonators and dielectric resonator
Between coupled structure and dielectric resonator and dielectric resonator between coupled structure, and input tap structure, pass through note
It moulds technique and forms one-piece parts, reduce assembly time, the production cycle is shorter.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is metal resonators and dielectric resonator coupled structure schematic diagram；
Fig. 3 is a kind of electric parameter schematic illustration of embodiment of the invention；
Fig. 4 is the schematic diagram of a kind of electric parameter of embodiment of the invention and the corresponding relationship of locations of structures shape；
Fig. 5 is the side length and resonance frequency corresponding relationship of dielectric resonator；
Fig. 6 is the corner cut and coefficient of coup corresponding relationship of dielectric resonator；
Fig. 7 is a kind of measured curve schematic diagram of embodiment of the invention.
Specific embodiment
The present invention will be further explained in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, a kind of bimodulus dielectric filter of the invention, including cavity 1 and cover board 2, the lid of cover board 2 are closed in cavity
On 1, it is fixedly connected using the modes such as welding or crimping.Several inner cavities 11 are equipped in cavity 1, in two neighboring inner cavity 11
It is interior, the metal resonators 3 that can generate a resonance frequency are equipped in one of inner cavity 11, being equipped in another inner cavity 11 can produce
The dielectric resonator 4 of raw two resonance frequencies, metal resonators 3 and dielectric resonator 4 are not contacted with corresponding 11 wall of inner cavity,
And upper surface using welding or the modes such as crimps and is fixed together with 2 lower surface of cover board.Cover board 2 is equipped with several tunings
Screw rod 21.
In one embodiment, dielectric resonator 4 is the medium block of a cuboid or square, two degenerate mode resonance
Frequency is respectively by the size independent control of the orthogonal first side of medium block and second side, and the first of dielectric resonator 4
The first coupling line 5 is equipped between side and metal resonators 3, in the second side of dielectric resonator 4 and another adjacent inner cavity 11
Dielectric resonator 4 between be equipped with the second coupling line 6.In the present embodiment, by changing first side top and second side
The side length of top changes the area of first side and second side, i.e., two degenerate mode resonance frequencies are respectively by the first side
Face top and second side top side length size independent control.Medium block a seamed edge corner cut (i.e. along the seamed edge by up to
Sagging vertical cut falls medium block a part), the seamed edge of corner cut is located at the opposite side of first side and second side intersection seamed edge, two letters
And the coupling amount between mould is controlled by the length of corner cut size of the medium block of dielectric resonator 4.
As shown in connection with fig. 4, dielectric resonator 4 uses cuboid medium block, and a side of medium block has corner cut C, control
The adjacent edge of two degenerate mode resonance frequencies is respectively A and B, and corner cut C and adjacent edge A and B are in opposite side, between two degenerate modes
Coupling amount determined by the volume of the corner cut C of the medium block medium block cut away, in the present embodiment corner cut direction be and corresponding side length
In 45 degree of constant angles, then the coupling amount between two degenerate modes is controlled by the top the corner cut C side length size of medium block, corner cut
(coupling amount between two degenerate modes of medium block becomes relationship between C size and coupling amount with corner cut size as shown in Figure 6
The relation curve of change), corner cut C is bigger, and coupling amount is bigger, and vice versa；Two degenerate mode resonance frequencies by medium block two phases
The relationship of adjacent side length independent control, adjacent side length and resonance frequency is as shown in Figure 5 (for two degenerate mode resonance of medium block
The relation curve that frequency changes with wherein a line), side length is longer, and corresponding resonance frequency is lower, and vice versa.
As shown in connection with fig. 2,5 one end of the first coupling line is connect with the disk edge of metal resonators 3, the other end and cover board 2
Connection adjusts cross-linked size and polarity by the positional relationship of the first coupling line of control 5 and adjacent media resonator 4；
Second coupling line, 6 both ends are connect with cover board 2, by controlling the positional relationship of the second coupling line 6 and adjacent media resonator 4,
Adjust cross-linked size and polarity.
In the present embodiment, the first coupling line 5 and the second coupling line 6 are the U-shaped bending metal wire of opening upwards, this
U-shaped bending metal wire coupling line can accurately be processed by way of wire cutting, it is ensured that have when batch production good consistent
Property.The bottom of first coupling line 5 and the second coupling line 6 is equipped with convex block 51, and bottom is equipped with the coupling line pedestal of insulation in cavity 1
8, coupling line pedestal 8 is equipped with the groove 81 cooperated with convex block 51, by determining the cooperation position of groove 81 and convex block 51, into one
The placement position for determining coupling line is walked, so that it is determined that the positional relationship of coupling line and adjacent media resonator, guarantees that filter is set
The electric parameter of meter is accurately realized, so that it is guaranteed that having good consistency when batch production.
The disk of metal resonators 3 is equipped with the tap structure 7 of input, and tap structure 7 includes from top to bottom setting gradually
Upper plastic spacer 72, tap piece 73 and lower plastic spacer 74 between the disk and cavity 1 of metal resonators 3, upper plastic mattress
Piece 72, tap piece 73 and lower plastic spacer 74 are fixed between the disk of metal resonators 3 and cavity 1 by plastic screw 71.
The coupling amount of input tap structure 7 is mainly determined that thickness is thinner by the thickness of upper plastic spacer 72,3 disk of metal resonators
Lower surface it is closer at a distance from tap piece 73, electric field is more sufficient, coupling amount it is bigger, it can be achieved that filter bandwidht it is wider, it is on the contrary
.The disadvantage of consistency difference when the tap structure 7 avoids human weld's tap.
In one embodiment, the coupled structure between metal resonators 3 and dielectric resonator 4 and dielectric resonator 4 with
Coupled structure between dielectric resonator 4, and the tap structure 7 of input, are processed into individual one by Shooting Technique
Part simplifies assembling process, improves production efficiency.
In one embodiment, as shown in Figure 3-4, it sets in cavity 1 there are four inner cavity 11, is equipped in two of them inner cavity 11
The metal resonators 3 of a resonance frequency (f0 or f5) can be generated, two degenerate modes can be generated by being equipped in other two inner cavity 11
The dielectric resonator 4 of resonance frequency (f1 and f2 or f3 and f4), the medium block contour structures of dielectric resonator 4 are with one
The rectangular parallelepiped structure of corner cut C.Relationship such as Fig. 3 institute of resonance frequency and coupling amount that the bimodulus dielectric filter of the present embodiment uses
Show, f0, f5 are the resonance frequency of two metal resonators 3 of head and the tail, and f1, f2 are two degeneracys of one of dielectric resonator 4
Mould resonance frequency, f3, f4 are two degenerate mode resonance frequencies of another dielectric resonator 4.K01,K12,K23,K34,
K45 indicates the coupling amount between different resonance frequencies, and wherein K02, K24 are cross-coupling amount.As shown in fig. 7, in the present embodiment
In, K02 is positive value, and corresponding transmission zero is located on the right of passband (i.e. it is high-end to be located at passband for frequency corresponding to transmission zero),
K24 is negative value, and corresponding transmission zero is located at the passband left side (frequency corresponding to transmission zero is located at passband low side).
It is each although being provided only with four inner cavities 11, two wire chambers and two dielectric cavities in cavity 1 in the present embodiment
Dielectric cavity can generate two degenerate mode resonance frequencies, i.e. six traditional chamber, two transmission zeros that can be realized of the present embodiment are filtered
The function of wave device, as shown in fig. 7, j1 be k24 caused by transmission zero, j2 be k02 caused by transmission zero, h1, h2,
The resonance peak that h3, h4, h5, h6 f1, f2, f3, f4, f5, f6 are generated after intercoupling.Compared to conventional filter, phase is being realized
In the case where congenerous, the overall volume of filter can be greatly reduced, and cost of manufacture is lower.
In the present embodiment, accurate plane is done by the outer dimension (A, B, C) of the dielectric resonator 4 of cube structure and is added
Work, can accurately control each electric parameter of filter, to guarantee the consistency of batch, reduce debug time, improve
Production efficiency.
As shown in figure 4, the coupling between metal resonators 3 and dielectric resonator 4, is realized by the first coupling line 5.If the
The tie point that one coupling line 5 is connect with cover board 2 is located on the center vertical line of adjacent edge, then the first coupling line 5 only realizes that metal is humorous
Coupling K01 between the resonance frequency f0 and the one of resonance frequency f1 of dielectric resonator of vibration device 3.Otherwise the first coupling line 5,
Other than K01, cross-coupling K02 can be also formed between another resonance frequency f2, generate transmission zero.With metal resonators
3 and 4 adjacent edge of dielectric resonator center vertical line be directed toward media interior as x-axis, if tie point is located in x-axis (D1 in figure
Set), then cross-coupling K02 is not generated, does not generate transmission zero；If tie point is located at x-axis Left half-plane (position D2 in figure),
Cross-coupling K02 is positive value, and it is high-end that frequency corresponding to the transmission zero generated is located at passband；If tie point is located at the x-axis right side
Half-plane (position D3 in figure), then cross-coupling K02 is negative value, and it is low that frequency corresponding to the transmission zero generated is located at passband
End.
As shown in figure 4, the coupling between dielectric resonator 4 and dielectric resonator 4, is realized by the second coupling line 6.Its coupling
It is similar with the coupled characteristic between above-mentioned metal resonators and dielectric resonator to close characteristic, for convenience of description, by wherein one end
Tie point is placed on the center vertical line of adjacent edge, when discussing that other end tie point is located at different location, is formed by coupling amount.
Media interior is directed toward as y-axis, by other end tie point using the center vertical line of dielectric resonator 4 and 4 adjacent edge of dielectric resonator
Position plane be divided into Left half-plane and right half plane,
If tie point is located in y-axis (position E1 in figure), cross-coupling K24 is not generated, does not generate transmission zero；If even
Contact is located at y-axis Left half-plane (position E2 in figure), then cross-coupling K24 be negative value, generate transmission zero corresponding to
Frequency is located at passband low side；If tie point is located at y-axis right half plane (position E3 in figure), cross-coupling K24 is positive value, is produced
It is high-end that frequency corresponding to raw transmission zero is located at passband.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent defines.
Claims (7)
1. a kind of bimodulus dielectric filter closes the cover board on cavity (1) including cavity (1), lid with several inner cavities (11)
(2), and the metal resonators (3) that a resonance frequency is generated in the inner cavity (11) are mounted on and two degenerate modes of generation are humorous
The dielectric resonator (4) of vibration frequency, it is characterised in that: the dielectric resonator (4) is the medium of a cuboid or square
Block, described two degenerate mode resonance frequencies are only by the first side of medium block adjacent orthogonal and the size of second side respectively
Vertical control, is equipped with the first coupling line (5) between the first side and metal resonators (3) of the dielectric resonator (4), is given an account of
The second coupling line is equipped between dielectric resonator (4) in the second side of matter resonator (4) and another adjacent inner cavity (11)
(6)；
Described first coupling line (5) one end is connect with the disk edge of metal resonators (3), and the other end is connect with cover board (2)；Control
The position for making the first coupling line (5) Yu adjacent media resonator (4), adjusts cross-linked size and polarity；Second coupling
Zygonema (6) both ends are connect with cover board (2), control the position of the second coupling line (6) and adjacent media resonator (4), and adjustment intersects
The size and polarity of coupling.
2. bimodulus dielectric filter according to claim 1, it is characterised in that: described two degenerate mode resonance frequency difference
By first side top and second side top side length size independent control.
3. bimodulus dielectric filter according to claim 1 or 2, it is characterised in that: a seamed edge of the medium block is cut
Angle, the seamed edge of the corner cut are located at the opposite side of first side and second side intersection seamed edge, the coupling between described two degenerate modes
Resultant is controlled by the volume size that the corner cut of medium block cuts away medium.
4. bimodulus dielectric filter according to claim 3, it is characterised in that: the direction of the corner cut is to be in corresponding edge
45 degree of constant angles, the coupling amount between described two degenerate modes are controlled by edge lengths in the corner cut of medium block.
5. bimodulus dielectric filter according to claim 3, it is characterised in that: inner cavity there are four being set in the cavity (1)
(11), the metal resonators (3) for generating a resonance frequency are equipped in two of them inner cavity (11), it is intracavitary in other two to be equipped with
Generate the dielectric resonator (4) of two degenerate mode resonance frequencies.
6. bimodulus dielectric filter according to claim 1, it is characterised in that: first coupling line (5) and the second coupling
Zygonema (6) is the U-shaped bending metal wire of opening upwards, and the bottom of first coupling line (5) and the second coupling line (6) is equipped with
Convex block (51), the interior bottom of the cavity (1) be equipped with insulation coupling line pedestal (8), the coupling line pedestal (8) be equipped with it is convex
The groove (81) of block (51) cooperation, determines the cooperation position of groove (81) and convex block (51), determines that coupling line is humorous with adjacent media
The position of vibration device (4).
7. bimodulus dielectric filter according to claim 3, it is characterised in that: in the disk of the metal resonators (3)
Tap structure (7) equipped with input, the tap structure (7) include the disk for being from top to bottom successively set on metal resonators (3)
Upper plastic spacer (72), tap piece (73) and lower plastic spacer (74) between face and cavity (1), the upper plastic spacer
(72), tap piece (73) and lower plastic spacer (74) are fixed on the disk and chamber of metal resonators (3) by plastic screw (71)
Between body (1).
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| CN201711072319.5A CN107946704B (en) | 2017-11-03 | 2017-11-03 | A kind of bimodulus dielectric filter |
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| CN201711072319.5A CN107946704B (en) | 2017-11-03 | 2017-11-03 | A kind of bimodulus dielectric filter |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109346806B (en) | 2018-09-30 | 2020-11-24 | 香港凡谷發展有限公司 | Convex cavity three-mode resonance structure and filter comprising same |
| CN113745780B (en) * | 2020-05-29 | 2022-10-28 | 华为技术有限公司 | Cavity filter and communication equipment |
| CN116565493A (en) * | 2022-01-29 | 2023-08-08 | 普罗斯通信技术（苏州）有限公司 | Metal injection molding filter and manufacturing method |
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