CN110534853A - A kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator - Google Patents
A kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator Download PDFInfo
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- CN110534853A CN110534853A CN201910844876.7A CN201910844876A CN110534853A CN 110534853 A CN110534853 A CN 110534853A CN 201910844876 A CN201910844876 A CN 201910844876A CN 110534853 A CN110534853 A CN 110534853A
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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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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Abstract
The present invention relates to technical field of electronic devices, more particularly to a kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator, including the resonator set gradually from top to bottom, earth plate and medium substrate, the resonator includes incoming feeder, output feeder, "-" type microstrip line and two symmetrically arranged minor matters groups, the both ends of the "-" type microstrip line respectively with incoming feeder, output feeder connection, the minor matters group includes the first coupling microstrip minor matters, second coupling microstrip minor matters, third coupling microstrip minor matters, short-circuit micro-band branch, plated-through hole and at least one open circuit micro-band branch.Multi-frequency band elimination filter proposed by the present invention, it is not only compact-sized, stop band attenuation is good, it is also equipped with precipitous intermediate zone roll-off slope simultaneously, the characteristics of stopband working frequency position can easily be accommodated, and flexible design, freedom degree with higher, the wireless mobile communications business for meeting modern multiple communication system standards and depositing.
Description
Technical field
The present invention relates to technical field of electronic devices, and in particular to a kind of based on the more of symmetrical fissions structure multimode resonator
Frequency bandstop filter.
Background technique
Wireless mobile communications business carries out signal transmission using multiple communication system standards and by the way of depositing at present, and with
Wireless communication is fast-developing, has further strong demand to the radio frequency microwave circuit of high-performance, miniaturization.And in communication system
Filter circuit, various useless noise signals can not only be filtered out, moreover it is possible to the signal interference between rejection band, ensure channel radio
The high quality of letter and stablizing plays the role of in terms of sex work vital.Therefore, research miniaturization, high performance multi-frequency band elimination
Filter becomes the hot issue that more and more scientific research personnel give more sustained attention.
Bandstop filter, which refers to, to decline by the frequency component in a certain frequency range but by the frequency component of other ranges
The filter for reducing to extremely low level is opposite with the concept of bandstop filter.With WLAN standard and worldwide interoperability for microwave
The development of access technology, frequency multiplexing technique have become the hot issue in current wireless communication system.Research and develop multiple-frequency operation
Miniaturization, highly selective bandstop filter have particularly important meaning in the communication system in the present age.
It focuses mostly on now about the research of rejector circuit and report in double frequency, three frequencies and four frequency these bands both at home and abroad
It hinders above filter response, and it is relatively fewer for the report with six frequencies and the six above frequency bands of frequency.This is because in researching and designing
When multi-frequency band elimination filter, with the increase of filter stop bend number, the topological structure of filter circuit is become more complicated, and to be made
It is good to obtain each stopband electric property performance, the required circuit parameter controlled that adjusts will substantially increase, and difficulty dramatically increases.And
And other than the multifrequency in addition to realizing microwave band-elimination filter, the compact-sized of filter circuit, Stopband Performance are good, are easy to adjust
Section and flexible design etc. are all that current microwave circuit researcher needs constantly to solve the problems, such as.
For this purpose, the present invention provides, one kind is compact-sized, and flexible design is controllable, with more freedom, based on symmetrical point
Split the multi-frequency band elimination filter of structure multimode resonator.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide one kind to be based on symmetrical fissions structure multimode resonator
Multi-frequency band elimination filter, by increase or decrease open circuit minor matters quantity, realize increase stopband or reduce stopband quantity mesh
, it can get different stopband quantity；Pass through adjust resonator in each section microstrip line size, thus it is possible to vary its transmission zero and
The position of transmission pole, the centre frequency position of adjustable stopband and Stopband Performance；By being closed to the multimode resonator
Reason ground folds, and can effectively reduce the volume of filter；Input port and output port by incoming feeder and output feeder with
Resonator coupling can improve the Stopband Performance of filter and with external characteristics by adjusting the length of incoming feeder and output feeder.
The purpose of the present invention is achieved through the following technical solutions:
A kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator, including what is set gradually from top to bottom
Resonator, earth plate and medium substrate, the resonator include incoming feeder, output feeder, "-" type microstrip line and two
The both ends of the minor matters group being symmetrical set, the "-" type microstrip line are connect with incoming feeder, output feeder respectively；
The minor matters group includes the first coupling microstrip minor matters, the second coupling microstrip minor matters, third coupling microstrip minor matters, short circuit
Micro-band branch, plated-through hole and at least one open circuit micro-band branch；
The second coupling microstrip minor matters intercouple with the first coupling microstrip minor matters, one end of the second coupling microstrip minor matters
Connect with one end of third coupling microstrip minor matters, the other ends of third coupling microstrip minor matters simultaneously with open circuit micro-band branch and short circuit
One end of micro-band branch connects, and the other end of short-circuit micro-band branch is connect with plated-through hole；
The first coupling microstrip minor matters of left side minor matters group are connect with incoming feeder, the first coupling microstrip branch of right side minor matters group
Section is connect with output feeder, the third coupling microstrip minor matters and the third coupling microstrip minor matters phase of right side minor matters group of left side minor matters group
Mutual coupling.
The above-mentioned multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator, included by the minor matters group of left and right side
Open circuit micro-band branch be each provided with three, be respectively the first open circuit micro-band branch, second open circuit micro-band branch and third open circuit
Micro-band branch, the first open circuit micro-band branch, the second open circuit micro-band branch and third open circuit micro-band branch are coupled with third
Micro-band branch connection.
Further, the lower end of third coupling microstrip minor matters is connect with the second coupling microstrip minor matters, third coupling microstrip branch
The upper end of section simultaneously with the first open circuit micro-band branch, the second open circuit micro-band branch, third open circuit micro-band branch and short-circuit micro-band branch
Section connection.
The above-mentioned multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator, the first coupling microstrip minor matters,
Second coupling microstrip minor matters, the first open circuit micro-band branch, the second open circuit micro-band branch, third open circuit micro-band branch are respectively that can roll over
Folded microwire band structure；The third coupling microstrip minor matters, short-circuit micro-band branch are respectively "-" type structure.
Preferably, the above-mentioned multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator, first coupling are micro-
Band minor matters, the second coupling microstrip minor matters are respectively 5 sections of bow-shaped structurals；The first open circuit micro-band branch is 4 sections of bow-shaped structurals；Institute
Stating the second open circuit micro-band branch is 4 sections of not closed frame-type structures；The first open circuit micro-band branch is 3 sections of semi-closed ring junctions
Structure.
As preferred parameter scheme, the above-mentioned multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator is described
The dielectric constant of medium substrate is 9.0~9.5, and tangent angle loss is 0.002~0.003, with a thickness of 0.8~1.2mm.
Parametric scheme more preferably, the dielectric constant of the medium substrate are 9.2, and tangent angle loss is 0.0022,
With a thickness of the Rogers TMM10 of 1.0mm.
As preferred parameter scheme, the above-mentioned multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator, with list
Bit length expression, unit mm,
A length of the 8.00~12.00 of the "-" type microstrip line, width are 0.20~0.40；
A length of the 5.00~7.00 of the first coupling microstrip minor matters, width are 0.05~0.15；
A length of the 5.00~7.00 of the second coupling microstrip minor matters, width are 0.05~0.15；
A length of the 5.00~8.00 of the third coupling microstrip minor matters, width are 0.35~0.55；
A length of the 0.50~1.50 of the short-circuit micro-band branch, width are 0.05~0.15；
The first open circuit micro-band branch a length of 6.00~10.00, width are 0.05~0.15；
The second open circuit micro-band branch a length of 5.50~8.00, width are 0.05~0.15；
The third open circuit micro-band branch a length of 12.00~16.00, width are 0.05~0.15；
The diameter of the plated-through hole is 0.40~0.80.
As preferred parameter scheme, the above-mentioned multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator, input
A length of 2.00~5.00mm of feeder line, width be 1.20~1.80mm, a length of 2.00~5.00mm of output feeder, width be 1.20~
1.80mm；The equivalent resistance of the incoming feeder and output feeder is 50 Ω.
Parametric scheme more preferably, is indicated with unit length, unit mm,
A length of the 9.25 of the "-" type microstrip line, width 0.30；
A length of the 5.90 of the first coupling microstrip minor matters, width 0.10；
A length of the 5.90 of the second coupling microstrip minor matters, width 0.10；
A length of the 6.79 of the third coupling microstrip minor matters, width 0.43；
A length of the 0.98 of the short-circuit micro-band branch, width 0.10；
The first open circuit micro-band branch a length of 8.05, width 0.10；
The second open circuit micro-band branch a length of 6.70, width 0.10；
The third open circuit micro-band branch a length of 14.03, width 0.10；
The diameter of the plated-through hole is 0.60.
Further, earth plate is the copper foil plate for being covered on medium substrate bottom surface, the surface area of earth plate and medium substrate
It is identical；Resonator is also made of copper foil plate, and the top surface of medium substrate is covered in.
The above-mentioned multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator, the first coupling microstrip minor matters and second
Coupling microstrip minor matters are arranged in pairs, and the part that the first coupling microstrip minor matters and the second coupling microstrip minor matters are coupled, length and
Width is equal respectively.
Further, the first coupling microstrip minor matters are identical with the length and width of the second coupling microstrip minor matters.
Further, the first coupling microstrip minor matters and the second coupling microstrip minor matters are arranged in pairs.Preferably, it is left,
In right minor matters group, the first coupling microstrip minor matters, the second coupling microstrip minor matters, third coupling microstrip minor matters, short-circuit micro-band branch
Section, plated-through hole, the first open circuit micro-band branch, the second open circuit micro-band branch, third open circuit micro-band branch correspond respectively
It is symmetrical arranged.
Further, the incoming feeder, output feeder are symmetricly set on the two sides of "-" type microstrip line；With incoming feeder
Line of symmetry with output feeder is axis, and minor matters group is symmetrical arranged, that is, in left and right minor matters group, with incoming feeder and output feedback
The line of symmetry of line is axis, the first coupling microstrip minor matters, the second coupling microstrip minor matters, third coupling microstrip minor matters, short circuit
Micro-band branch, plated-through hole, the first open circuit micro-band branch, the second open circuit micro-band branch, third open circuit micro-band branch difference one
A pair should be symmetrical arranged.
Further, the earth plate is identical as the length and width of medium substrate.
Further, the earth plate is the metal plate that medium substrate is completely covered.
The present invention is after adopting the above technical scheme, the beneficial effect realized is: the resonator in 1. present invention can lead to
The quantity for increasing or decreasing open circuit minor matters is crossed, the purpose for increasing stopband or reducing stopband quantity is realized, can get different stopband numbers
The multi-frequency band elimination filter of amount；2. making multimode resonator of the invention by reasonably being folded to the multimode resonator
Multi-frequency band elimination filter is not only compact-sized, stop band attenuation is good, also efficiently solves traditional multi-band resistance filter ruler
Very little larger bring relevant issues；3. by controlling structural parameters of the invention, the available high-performance for meeting different demands is more
Frequency bandstop filter；4. by the length for adjusting incoming feeder and output feeder the Stopband Performance of filter can be improved and with outer
Characteristic.It is also equipped with precipitous intermediate zone roll-off slope simultaneously, the characteristics of stopband working frequency position can easily be accommodated, and designs spirit
It is living, freedom degree with higher, the wireless mobile communications business for meeting modern multiple communication system standards and depositing.
Detailed description of the invention
Fig. 1 is the cross section structure figure of multi-frequency band elimination filter proposed by the present invention；
Fig. 2 is the plan view of the earth plate in multi-frequency band elimination filter proposed by the present invention；
Fig. 3 is a kind of preferred structure schematic diagram of the resonator in multi-frequency band elimination filter proposed by the present invention；
Fig. 4 is emulation and the test comparison result curve figure of multi-frequency band elimination filter proposed by the present invention.
In figure: 1- earth plate, 2- medium substrate, 3- resonator, 4- incoming feeder, 5- output feeder, 6- "-" type micro-strip
Line, 7- the first coupling microstrip minor matters, 8- the second coupling microstrip minor matters, 9- third coupling microstrip minor matters, 10- short-circuit micro-band branch,
11- plated-through hole, the open circuit micro-band branch of 12- first, the open circuit micro-band branch of 13- second, 14- third open circuit micro-band branch.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing, but protection scope of the present invention is not limited to
It is as described below.
As shown in Figure 1 to Figure 3, a kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator, including from
Resonator 3, earth plate 1 and the medium substrate 2 set gradually under above, as shown in figure 3, the resonator 3 includes incoming feeder
4, the minor matters group that output feeder 5, "-" type microstrip line 6 and two are symmetrical set, the two of the "-" type microstrip line 6
End is connect with incoming feeder 4, output feeder 5 respectively, i.e., "-" type microstrip line 6 be connected to incoming feeder 4 and output feeder 5 it
Between, the outer end of the incoming feeder 4 and output feeder 5 is connected separately with a SMA connector and (is not shown in the figure.SMA connection
Head is a kind of coaxial connector of widely used small-sized threaded connection).
The symmetrically arranged minor matters group in the left and right sides, each minor matters group include that the coupling of the first coupling microstrip minor matters 7, second is micro-
Band minor matters 8, third coupling microstrip minor matters 9, short-circuit micro-band branch 10, plated-through hole 11 and at least one open circuit micro-strip branch
Section.The second coupling microstrip minor matters 8 intercouple with the first coupling microstrip minor matters 7, one end of the second coupling microstrip minor matters 8 with
One end of third coupling microstrip minor matters 9 connects, the other end of the third coupling microstrip minor matters 9 simultaneously with open circuit micro-band branch and
One end of short-circuit micro-band branch 10 connects, and the other end of the short-circuit micro-band branch 10 is connect with plated-through hole 11.
The first coupling microstrip minor matters 7 of left side minor matters group are connect with incoming feeder 4, the first coupling microstrip of right side minor matters group
Minor matters 7 are connect with output feeder 5, the third coupling microstrip minor matters 9 of left side minor matters group and the third coupling microstrip of right side minor matters group
Minor matters 9 intercouple.
In electronics and field of telecommunications, coupling refers to that energy is passed from a medium (such as metal wire, an optical fiber)
It is multicast to the process of another medium.In electronics, coupling refers to that the energy from a circuit part to another circuit part passes
It passs.
As shown in Figure 1, the multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator is divided into for three layers, from upper
It is resonator 3, medium substrate 2 and earth plate 1 respectively, earth plate 1 is identical with the surface area of medium substrate 2, medium substrate under
2 preferred thickness are the printed circuit board of 1mm as dielectric-slab, and model is preferably TMM10, are insulating materials.Earth plate 1 is covering
Copper foil plate in 2 bottom surface of medium substrate, earth plate 1 are a leveling panel, and thickness is preferably 0.035mm, play ground connection,
The laying of other features is not carried out on earth plate 1, the concrete shape and structure of earth plate 1 are shown in Figure 2.It was using
Cheng Zhong, the copper sheathing shell by the two sides of earth plate 1 respectively with incoming feeder 4 and two SMA connectors of output feeder 5 connect
It connects, and the probe as the setting of the connector central spindle position SMA of coaxial connector is then connect with incoming feeder 4 or output feeder 5
(the ambroin ring that the two is isolated is laid between the copper sheathing shell of SMA connector and the probe at central spindle position).Resonator 3
It is cut and is made using copper foil plate, the thickness of the copper foil plate preferred in the present embodiment thickness of 0.035mm, resonator 3 cover
It is located at the top surface of medium substrate 2.
Specifically, the dielectric constant of the medium substrate 2 is 9.0~9.5, and tangent angle loss is 0.002~0.003, thick
Degree is 0.8~1.2mm.
In a preferred embodiment, the dielectric constant of the medium substrate 2 is 9.2, and tangent angle loss is 0.0022, thick
Degree is the Rogers TMM10 (tm) of 1.0mm.
Specifically, open circuit micro-band branch included by the minor matters group of left and right side is each provided with three, is the first open circuit respectively
Open a way micro-band branch 13, the third of micro-band branch 12, second is opened a way micro-band branch 14, and the quantity for micro-band branch of opening a way certainly can be with
Less than three or more than three, one to six open circuit micro-band branch is such as set, the specific setting quantity of micro-band branch of opening a way according to
It is determined needed for it with the quantity hindered.
The first open circuit micro-band branch 12, second opens a way micro-band branch 13 and third open circuit micro-band branch 14 and third
Coupling microstrip minor matters 9 connect, i.e., one end of third coupling microstrip minor matters 9 is connect with the second coupling microstrip minor matters 8, and third coupling is micro-
The other end with minor matters 9 simultaneously with first open circuit micro-band branch 12, second open a way micro-band branch 13, third open a way micro-band branch 14
It is connected with short-circuit micro-band branch 10.
In the present embodiment, the first coupling microstrip minor matters 7, the second coupling microstrip minor matters 8, first open circuit micro-strip branch
The 12, second open circuit of section micro-band branch 13, third open circuit micro-band branch 14 are respectively foldable microwire band structure, the third coupling
Micro-band branch 9, short-circuit micro-band branch 10 are respectively "-" type structure.
Specifically, the first coupling microstrip minor matters 7, the second coupling microstrip minor matters 8 are respectively 5 sections of bow-shaped structurals, described
First open circuit micro-band branch 12 is 4 sections of bow-shaped structurals, and the second open circuit micro-band branch 13 is 4 sections of not closed frame-type structures,
The first open circuit micro-band branch 14 is 3 sections of semi-closed ring structures.
In Fig. 3, black arrow and lines represent starting point, terminal and the length of each minor matters.Black arrow, lines and end
Short-term section, be the equal of to the length of each minor matters mark, for mark each minor matters linear measure longimetry path and range, black
The end line at arrow both ends, that is, two endpoints (starting point and stop) of each minor matters.In Fig. 3, left side minor matters group and right side
Minor matters group is symmetrically arranged, mark and identification for convenience, and in Fig. 3, black arrow and lines use dispersion mark
Mode is marked in left and right minor matters group, and the side not marked is in that symmetry is identical with the side being labelled with.
Specifically, it being indicated with unit length, unit takes mm,
A length of the 8.00~12.00 of the "-" type microstrip line 6, width are 0.20~0.40；
A length of the 5.00~7.00 of the first coupling microstrip minor matters 7, width are 0.05~0.15；
A length of the 5.00~7.00 of the second coupling microstrip minor matters 8, width are 0.05~0.15；
A length of the 5.00~8.00 of the third coupling microstrip minor matters 9, width are 0.35~0.55；
A length of the 0.50~1.50 of the short-circuit micro-band branch 10, width are 0.05~0.15；
The first open circuit micro-band branch 12 a length of 6.00~10.00, width are 0.05~0.15；
The second open circuit micro-band branch 13 a length of 5.50~8.00, width are 0.05~0.15；
The third open circuit micro-band branch 14 a length of 12.00~16.00, width are 0.05~0.15；
The diameter of the plated-through hole 11 is 0.40~0.80.
Further, scheme more preferably indicates as unit of mm in a preferred embodiment,
A length of the 9.25 of the "-" type microstrip line 6, width 0.30；
A length of the 5.90 of the first coupling microstrip minor matters 7, width 0.10；
A length of the 5.90 of the second coupling microstrip minor matters 8, width 0.10；
A length of the 6.79 of the third coupling microstrip minor matters 9, width 0.43；
A length of the 0.98 of the short-circuit micro-band branch 10, width 0.10；
The first open circuit micro-band branch 12 a length of 8.05, width 0.10；
The second open circuit micro-band branch 13 a length of 6.70, width 0.10；
The third open circuit micro-band branch 14 a length of 14.03, width 0.10；
The diameter of the plated-through hole 11 is 0.60.
The first coupling microstrip minor matters 7 are arranged in pairs with the second coupling microstrip minor matters 8, and the first coupling microstrip minor matters 7
The part being coupled with the second coupling microstrip minor matters 8, length and width are equal respectively；Second coupling microstrip minor matters 8 and third coupling
It closes micro-band branch 9 to connect, the first coupling microstrip minor matters 7 are not connect with third coupling microstrip minor matters 9.
In present embodiment, in left and right minor matters group, the first coupling microstrip minor matters 7, the second coupling microstrip minor matters 8,
Third coupling microstrip minor matters 9, short-circuit micro-band branch 10, the open circuit open circuit micro-strip of micro-band branch 12, second of plated-through hole 11, first
Minor matters 13, third open circuit micro-band branch 14 correspond be symmetrical arranged respectively.
Specifically, the two sides of "-" type microstrip line 6 are arranged in the incoming feeder 4, output feeder symmetrical 5；To input feedback
The line of symmetry of line 4 and output feeder 6 is axis, and minor matters group is symmetrical arranged, that is, in left and right minor matters group, with 4 He of incoming feeder
The line of symmetry of output feeder 5 is axis, the first coupling microstrip minor matters 7, the second coupling microstrip minor matters 8, third coupling microstrip
Minor matters 9, short-circuit micro-band branch 10, plated-through hole 11, first open circuit micro-band branch 12, second open circuit micro-band branch 13, third
Open circuit micro-band branch 14 corresponds respectively is symmetrical arranged (example: left using the line of symmetry of incoming feeder 4 and output feeder 5 as axis
First coupling microstrip minor matters 7 of side shoot knot cluster and the first coupling microstrip minor matters 7 of right side minor matters group are symmetrical arranged, left side minor matters group
The second coupling microstrip minor matters 9 and the second coupling microstrip minor matters 8 of right side minor matters group be symmetrical arranged).
Specifically, the earth plate 1 is identical as the length and width of medium substrate 2.
Specifically, the earth plate 1 is the metal plate that medium substrate 2 is completely covered.
Specifically, indicated with unit length, a length of 2.00~5.00mm of the incoming feeder 4, width be 1.20~
1.80mm, a length of 2.00~5.00mm of output feeder 5, width are 1.20~1.80mm.In a preferred embodiment, it is with mm
Unit, a length of 2.50mm of the incoming feeder 4, width 1.57mm, a length of 2.50mm of output feeder 5, width 1.57mm.It is excellent
Selection of land, the length and width and output feeder 5 of the incoming feeder 4 are identical.Incoming feeder 4 and output feeder 5 are simulation result feeder line, defeated
The equivalent resistance for entering feeder line 4 and output feeder 5 is 50 Ω.
Using in test process, by the present invention is based on the multi-frequency band elimination filter of hybrid electromagnetic coupling multimode resonator into
Row test and l-G simulation test, emulation with test comparison result curve figure as shown in figure 4, this filter produces six stopbands, in
Frequency of heart test value is respectively 1.91GHz, 2.37GHz, 3.43GHz, 4.35GHz, 5.16GHz and 6.81GHz, 10dB stopband
Relative bandwidth is respectively 9.42%, 14.35%, 20.41%, 11.49%, 17.82% and 6.61%, corresponding stopband attenuation
Respectively 32.46dB, 15.69dB, 31.27dB, 30.43dB, 23.72dB and 22.50dB.
In conclusion multi-frequency band elimination filter of the invention is to generate transmission zero by symmetrical fissions structure multimode resonator
It puts with transmission pole and forms stopband；Based on the multi-frequency band elimination filter that symmetrical fissions structure multimode resonator is realized, not only
It is compact-sized, stop band attenuation is good, while be also equipped with precipitous intermediate zone roll-off slope, stopband working frequency position is easy to
The characteristics of adjusting, and simple and flexible is designed, freedom degree with higher, the nothing for meeting modern multiple communication system standards and depositing
Line mobile communication business.
The above is only a preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and can be at this
In the text contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art institute into
Capable modifications and changes do not depart from the spirit and scope of the present invention, then all should be in the protection scope of appended claims of the present invention
It is interior.
Claims (10)
1. a kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator, humorous including what is set gradually from top to bottom
Vibration device (3), earth plate (1) and medium substrate (2), it is characterised in that: the resonator (3) includes incoming feeder (4), output feedback
Line (5), "-" type microstrip line (6) and two minor matters groups being symmetrical set, the both ends point of the "-" type microstrip line (6)
It is not connect with incoming feeder (4), output feeder (5)；
The minor matters group includes the first coupling microstrip minor matters (7), the second coupling microstrip minor matters (8), third coupling microstrip minor matters
(9), short-circuit micro-band branch (10), plated-through hole (11) and at least one open circuit micro-band branch；
The second coupling microstrip minor matters (8) intercouple with the first coupling microstrip minor matters (7), the second coupling microstrip minor matters (8)
One end connect with one end of third coupling microstrip minor matters (9), the other ends of third coupling microstrip minor matters (9) simultaneously with open a way it is micro-
It is connected with minor matters with one end of short-circuit micro-band branch (10), the other end of short-circuit micro-band branch (10) and plated-through hole (11) are even
It connects；
The first coupling microstrip minor matters (7) of left side minor matters group are connect with incoming feeder (4), the first coupling microstrip of right side minor matters group
Minor matters (7) are connect with output feeder (5), the third coupling microstrip minor matters (9) of left side minor matters group and the third coupling of right side minor matters group
Micro-band branch (9) are closed to intercouple.
2. a kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator according to claim 1, special
Sign is: open circuit micro-band branch included by the minor matters group of left and right side is each provided with three, is the first open circuit micro-band branch respectively
(12), the second open circuit micro-band branch (13) and third open circuit micro-band branch (14), first open circuit micro-band branch (12), second
Open circuit micro-band branch (13) and third open circuit micro-band branch (14) are connect with third coupling microstrip minor matters (9).
3. a kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator according to claim 2, special
Sign is: the lower end of third coupling microstrip minor matters (9) is connect with the second coupling microstrip minor matters (8), third coupling microstrip minor matters (9)
Upper end simultaneously with first open circuit micro-band branch (12), second open circuit micro-band branch (13), third open circuit micro-band branch (14) and
Short-circuit micro-band branch (10) connection.
4. a kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator according to claim 2, special
Sign is: the first coupling microstrip minor matters (7), the second coupling microstrip minor matters (8), the first open circuit micro-band branch (12), second
It opens a way micro-band branch (13), third open circuit micro-band branch (14) is respectively foldable microwire band structure；The third coupling microstrip
Minor matters (9), short-circuit micro-band branch (10) are respectively "-" type structure.
5. a kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator according to claim 4, special
Sign is: the first coupling microstrip minor matters (7), the second coupling microstrip minor matters (8) are respectively 5 sections of bow-shaped structurals；Described first
Micro-band branch (12) are opened a way as 4 sections of bow-shaped structurals；Second open circuit micro-band branch (13) is 4 sections of not closed frame-type structures；
First open circuit micro-band branch (14) is 3 sections of semi-closed ring structures.
6. a kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator according to claim 1, special
Sign is: the dielectric constant of the medium substrate (2) is 9.0~9.5, and tangent angle loss is 0.002~0.003, with a thickness of 0.8
~1.2mm.
7. a kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator according to claim 2, special
Sign is: it is indicated with unit length, unit mm,
A length of the 8.00~12.00 of the "-" type microstrip line (6), width are 0.20~0.40；
A length of the 5.00~7.00 of the first coupling microstrip minor matters (7), width are 0.05~0.15；
A length of the 5.00~7.00 of the second coupling microstrip minor matters (8), width are 0.05~0.15；
A length of the 5.00~8.00 of the third coupling microstrip minor matters (9), width are 0.35~0.55；
A length of the 0.50~1.50 of the short-circuit micro-band branch (10), width are 0.05~0.15；
First open circuit micro-band branch (12) a length of 6.00~10.00, width are 0.05~0.15；
Second open circuit micro-band branch (13) a length of 5.50~8.00, width are 0.05~0.15；
Third open circuit micro-band branch (14) a length of 12.00~16.00, width are 0.05~0.15；
The diameter of the plated-through hole (11) is 0.40~0.80.
8. a kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator according to claim 1, special
Sign is: a length of 2.00~5.00mm of incoming feeder (4), width be 1.20~1.80mm, output feeder (5) a length of 2.00~
5.00mm, width are 1.20~1.80mm；The equivalent resistance of the incoming feeder (4) and output feeder (5) is 50 Ω.
9. a kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator according to claim 1, special
Sign is: earth plate (1) is the copper foil plate for being covered on medium substrate (2) bottom surface, the surface of earth plate (1) and medium substrate (2)
Product is identical；Resonator (3) is also made of copper foil plate, and the top surface of medium substrate (2) is covered in.
10. a kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator according to claim 1, special
Sign is: the first coupling microstrip minor matters (7) are arranged in pairs with the second coupling microstrip minor matters (8), and the first coupling microstrip minor matters (7)
The part being coupled with the second coupling microstrip minor matters (8), length and width are equal respectively.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115189108A (en) * | 2022-08-08 | 2022-10-14 | 河南科技大学 | Double-passband filter based on multimode resonator |
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| CN101719579A (en) * | 2009-12-30 | 2010-06-02 | 西安空间无线电技术研究所 | Multi-band bandstop filter and multi-band bandpass filter |
| CN102386464A (en) * | 2011-11-03 | 2012-03-21 | 华南理工大学 | Double-frequency band elimination filter |
| CN204130668U (en) * | 2014-07-24 | 2015-01-28 | 华南理工大学 | A kind of Double-frequency band elimination filter adopting three path signal interference |
| CN105762465A (en) * | 2016-04-07 | 2016-07-13 | 重庆邮电大学 | Miniaturized ultra wide band filter with two-notch features |
| US20180145384A1 (en) * | 2014-03-27 | 2018-05-24 | Murata Manufacturing Co., Ltd. | Electronic apparatus |
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2019
- 2019-09-07 CN CN201910844876.7A patent/CN110534853B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101719579A (en) * | 2009-12-30 | 2010-06-02 | 西安空间无线电技术研究所 | Multi-band bandstop filter and multi-band bandpass filter |
| CN102386464A (en) * | 2011-11-03 | 2012-03-21 | 华南理工大学 | Double-frequency band elimination filter |
| US20180145384A1 (en) * | 2014-03-27 | 2018-05-24 | Murata Manufacturing Co., Ltd. | Electronic apparatus |
| CN204130668U (en) * | 2014-07-24 | 2015-01-28 | 华南理工大学 | A kind of Double-frequency band elimination filter adopting three path signal interference |
| CN105762465A (en) * | 2016-04-07 | 2016-07-13 | 重庆邮电大学 | Miniaturized ultra wide band filter with two-notch features |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115189108A (en) * | 2022-08-08 | 2022-10-14 | 河南科技大学 | Double-passband filter based on multimode resonator |
| CN115189108B (en) * | 2022-08-08 | 2023-10-20 | 河南科技大学 | Double-passband filter based on multimode resonator |
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