CN110444840A - Double frequency differential bandpass filter based on minor matters Load resonators - Google Patents
Double frequency differential bandpass filter based on minor matters Load resonators Download PDFInfo
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- CN110444840A CN110444840A CN201910722709.5A CN201910722709A CN110444840A CN 110444840 A CN110444840 A CN 110444840A CN 201910722709 A CN201910722709 A CN 201910722709A CN 110444840 A CN110444840 A CN 110444840A
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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
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20336—Comb or interdigital filters
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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
- H01P1/2039—Galvanic coupling between Input/Output
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Abstract
The invention proposes a kind of double frequency differential bandpass filters based on minor matters Load resonators.Solve the problems, such as the high Insertion Loss of filter, low selectivity and deficient flexible design.It is printed between two parties there are two the opposite interdigital coupling minor matters Load resonators of standard, therewith at the stepped impedance microstrip line of the interdigital coupling of three lines and the U-shaped microstrip line of two sides medium substrate upper surface；There are two linear types and the L-type stepped impedance slot line being rotated by 90 ° counterclockwise for base lower surface etching.The above structure is about medium substrate central point central symmetry.The 90 ° of bending designs of central symmetry and stepped impedance slot line of all structures of the present invention about substrate center's point, greatly reduce filter size；Quasi- interdigital coupling and the interdigital coupled structure of three lines reduce filter insertion loss and form three transmission zeros, enhance filter selectivity；The minor matters of center loaded have open circuit and short-circuit two kinds of forms, and frequency Independent adjustable adapts to different demands, are used for wireless communication system radio-frequency front-end.
Description
Technical field
The invention belongs to microwave and radio frequency arts, the structure and design of bandpass filter are related generally to, specifically one
Double frequency differential bandpass filter of the kind based on minor matters Load resonators, can be applied to wireless communication system radio-frequency front-end.
Background technique
In recent years, with the rapid development of wireless communication technique, a kind of frequency-selective devices of the filter as key are risen
Increasingly important role, performance quality often directly influence the superiority and inferiority of entire communication system.Microstrip bandpass filter
Because its have many advantages, such as it is small in size, light-weight, can produce the distribution of any transmission zero and asymmetric rejection characteristic is answered extensively
With.Since radio frequency and microwave communication frequency range are extremely limited, the communications band for expanding high frequency is more necessary.In the height newly proposed
In frequency passband, in order to be compatible with traditional low-frequency communications band and the new high-frequency communication frequency range expanded, dual-passband communication system can not or
It lacks, for example current WIFI system is just mostly the double frequency of 2.4GHz and 5GHz.As the core of dual-passband system, dual-passband filtering
Device plays highly important role in a communications system.Conventional method realizes that the main path of double-passband filter is cascade two
A single-pass band filter, but this method occupies a large amount of space resources, thus directly generate the filters of two passbands quite by
It welcomes.On the other hand, modern wireless systems are faced with increasingly complicated electromagnetic environment, this makes people to the anti-interference of filter
More stringent requirements are proposed for ability.Difference channel because of its outstanding anti-common mode (CM) interference performance, improve Dynamic Range and
It is widely adopted.Differential configuration is introduced into double frequency filter, the miniaturization of system has both been realized, is also achieved good anti-dry
Immunity energy.Micro-strip-slot line (MS) transition structure, because of its intrinsic anti-CM interference performance and independent differential mode (DM) response, quilt
It is widely used in difference passive device.In order to promote the performance of double frequency differential bandpass filter, including insertion loss, with outer selection
Property, common mode inhibition degree etc., the research of difference double frequency band-pass filter receives lot of domestic and foreign scholar and more and more pays close attention to.
The scholars such as Li Yang in 2015 are in IEEE TRANSACTIONSON MICROWAVE THEORY AND TECHNIQUES periodical
Publish thesis " Balanced Dual-Band Bandpass Filter With on (VOL.63, NO.7, JULY 2015)
Multiple Transmission Zeros Using Doubly Short-Ended Resonator Coupled Line ",
A kind of double frequency differential bandpass filter based on both-end short-circuit resonant device is proposed, three transmission zeros, but filter are realized
The centre frequency of two passbands cannot be separately adjustable, and the overall dimensions designed are larger.The human hairs such as Nantong University Chu Hui in 2016
A kind of double frequency difference filter is illustrated, Authorization Notice No. is 105762447 B of CN, small size is realized using multi-layer board, but
It is that structure is complicated and the centre frequency of two passbands of filter does not have independent adjustability.Jian-Xin Chen in 2018 etc. is learned
Person is in IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS periodical (VOL.28, NO.8, AUGUST
2018) publish thesis " Miniaturized Dual-band Differential Filter Using Dual-mode on
Dielectric Resonator " proposes a kind of double frequency difference filter based on bimodulus dielectric resonator, can be realized frequency
Rate Independent adjustable, but only there are two there is a transmission zero between frequency band, filter it is not good enough with outer selectivity.
To sum up, based on existing difference double frequency filter structure size is big, insertion loss is big, cannot separately adjustable two it is logical
The disadvantages of frequency and bandwidth of band, low selectivity, we design a kind of compact-sized, filter with low insertion loss, it is highly selective, can be separately adjustable
The double frequency differential bandpass filter based on minor matters Load resonators of centre frequency has for increasingly complicated communication system
There are enough flexibilities and practicability.
Summary of the invention
It is a kind of based on minor matters Load resonators it is an object of the invention in view of the above shortcomings of the prior art, propose
Double frequency differential bandpass filter.It is intended to improve the flexibility of double frequency difference filter design and with outer selectivity.
The present invention is a kind of double frequency differential bandpass filter based on minor matters Load resonators, includes medium substrate, should
There are two minor matters to load micro-strip resonantor, two stepped impedance microstrip lines, two minor matters loads for the upper surface printing of medium substrate
Micro-strip resonantor both sides are printed with U-shaped microstrip line, and the lower surface of the medium substrate is printed with metal floor, on the metal floor
Positioned at the side of U-shaped microstrip line, it is etched with stepped impedance slot line；It is characterized by:
Described two minor matters load micro-strip resonantor position is placed in the middle, is the minor matters Load resonators of one section of E type respectively, and two
The minor matters Load resonators opening of E type is opposite, and ladder resistance is equipped on the outside of the E type structure of the minor matters Load resonators of two E types
Anti- microstrip line, E type structure lateral face are inserted into the groove of the anti-line end of stepped impedance microstrip line medium or low resistance, and it is interdigital to form three lines
Coupling；
The stepped impedance microstrip line is connected by the high impedance microstrip line of rectangle with the Low ESR microstrip line of rectangle, high impedance
There is the metallization VIA of a ground connection in line end,
The stepped impedance slot line includes one section of rectilinear flights impedance gap line and one section of L-type stepped impedance slot line
It is connected, L-type stepped impedance slot line has rotated 90 ° compared with rectilinear flights impedance gap line counterclockwise；Rectilinear flights impedance seam
The etching of gap line corresponds to the middle position at straight line micro-strip bottom in U-shaped microstrip line；The etching of L-type stepped impedance slot line corresponds to ladder
In impedance micro-strip below high impedance line；
Two minor matters Load resonators, two stepped impedance microstrip lines, two U-shaped microstrip lines, two linear types
Slot line and two L-type stepped impedance slot lines are about 1 central point central symmetry of medium substrate；The minor matters load resonant
The minor matters of the center loaded of device are respectively equipped with open circuit and short-circuit two kinds of forms, can be used to the center frequency of separately adjustable two frequency bands
Rate.
Compared with prior art, the present invention having the advantage that
1. the present invention due to using minor matters Load resonators, is added by adjusting the micro-strip resonantor center in this configuration
The minor matters of load, can be with the centre frequency of separately adjustable two frequency bands of filter；It is passed different from most of differential microstrips-slot line
Defeated structure, the U-shaped microstrip line and stepped impedance slot line in the present invention are about dielectric-slab central point central symmetry, and L-type ladder
Impedance gap line has rotated 90 ° compared with rectilinear flights impedance gap line counterclockwise, greatly reduces the size of filter, protects simultaneously
Good common-mode rejection properties are stayed.
It is open-end minor matters and terminal short circuit branch respectively 2. there are two types of forms for the minor matters Load resonators that the present invention uses
Section, enhances the flexibility and convenience of design, conveniently adapts in different application demands, in addition, short-circuit minor matters are solid due to it
There is characteristic, has further reduced the size of filter.
3. the present invention is due in a pair of three lines of stepped impedance microstrip line etched inside interdigital coupling threadiness gap, with minor matters
It loads between micro-strip resonantor through the interdigital coupled transfer energy of three lines, enhances the coupling between outputting and inputting, reduce
The insertion loss of filter；The coupled modes can generate two transmission zeros in differential mode near pass-band, use compared to most of
The filter of single resonator generates one by quasi- interdigital coupling between two resonators present invention uses two resonators
A transmission zero, by adjusting the slot-coupled between stepped impedance microstrip line and minor matters Load resonators, thus it is possible to vary transmission
The position of zero point, has been obviously improved the design flexibility of double frequency differential bandpass filter and with outer selectivity, maintain compared with
High common mode inhibition.
4. the present invention has the characteristic of Wide stop bands, the selectivity of filter is enhanced.
Detailed description of the invention
Fig. 1 is the double frequency difference filter overall structure diagram based on open circuit minor matters Load resonators in the present invention；
Fig. 2 is the double frequency difference filter overall structure diagram based on short-circuit minor matters Load resonators in the present invention；
Fig. 3 is the position dimension figure of U-shaped input and output microstrip line (structure is identical in two kinds of models)；
Fig. 4 is the position dimension figure of open circuit minor matters Load resonators and stepped impedance microstrip line；
Fig. 5 is the position dimension figure of short out minor matters Load resonators and stepped impedance microstrip line；
Fig. 6 is each locations of structures dimensional drawing in medium substrate lower surface (structure is identical in two kinds of models)；
Fig. 7 is the differential mode return loss and difference of the double frequency difference filter of the invention based on open circuit minor matters Load resonators
The S parameter measured drawing of mould insertion loss；
Fig. 8 is the common mode return loss of the double frequency difference filter of the invention based on open circuit minor matters Load resonators and is total to
The S parameter measured drawing of mould insertion loss；
Fig. 9 is the differential mode return loss and difference of the double frequency difference filter of the invention based on short-circuit minor matters Load resonators
The S parameter measured drawing of mould insertion loss；
Figure 10 be the double frequency difference filter of the invention based on short-circuit minor matters Load resonators common mode return loss and
The S parameter measured drawing of Common Mode insertion loss.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1:
With the continuous development of the communications field, communication system becomes increasingly complex, as device essential in radio-frequency receiving-transmitting
Part, filter become particularly important, and can the quality of performance of filter is related to entire communication system normal operation.High frequency is
System is especially complicated, this requires filter to have stronger anti-interference ability, and difference filter comes into being.In recent years, have very much
Difference filter is invented and is proposed, but cannot meet multiband, filter with low insertion loss, highly selective and design flexibility simultaneously mostly,
The present invention is insufficient for these, devises a kind of double frequency difference filter based on minor matters Load resonators, can be realized Gao Xuan
Selecting property and design flexibility.
The present invention is a kind of double frequency differential bandpass filter based on minor matters Load resonators, referring to Fig. 1 and Fig. 2: including
There is medium substrate 1, there are two minor matters to load 2, two stepped impedance micro-strips of micro-strip resonantor for the upper surface printing of the medium substrate 1
3, two minor matters load 2 both sides of micro-strip resonantor of line are printed with U-shaped microstrip line 5, and the lower surface of present media substrate 1 is printed with
Metal floor 6 is located at the side of U-shaped microstrip line 5 on the metal floor 6, is etched with stepped impedance slot line.
Two minor matters load, 2 position of micro-strip resonantor of the invention is placed in the middle, is the minor matters load resonant of one section of E type respectively
The minor matters Load resonators opening of device, two E types is opposite；It is equipped on the outside of the E type structure of the minor matters Load resonators of two E types
Stepped impedance microstrip line 3, E type structure lateral face are inserted into the groove of the anti-line end of 3 medium or low resistance of stepped impedance microstrip line, are formed
The interdigital coupling of three lines.
Stepped impedance microstrip line 3 of the invention is connected by the high impedance microstrip line of rectangle with the Low ESR microstrip line of rectangle,
There is the metallization VIA 4 of a ground connection in high impedance line end.
Stepped impedance slot line of the invention includes one section of rectilinear flights impedance gap line 7 and one section of L-type stepped impedance
Slot line 8 is connected, and etching and layout is in the lower surface of medium substrate 1, i.e., on metal floor 6.L-type stepped impedance slot line 8
90 ° are had rotated counterclockwise compared with rectilinear flights impedance gap line 7.Wider rectangular aperture in rectilinear flights impedance gap line 7
It is etched in middle position square under straight line micro-strip in corresponding U-shaped microstrip line and edge is to U-shaped microstrip line inside, or perhaps correspond to
In the bottom middle position of U-shaped microstrip line.Relatively narrow rectangular aperture is etched in corresponding to U in rectilinear flights impedance gap line 7
Middle position square under straight line micro-strip and along on the outside of U-shaped microstrip line in type microstrip line.In L-type stepped impedance slot line 8 compared with
Narrow rectangular aperture location of etch corresponds in stepped impedance microstrip line 3 below high impedance line；In L-type stepped impedance slot line 8
Wider rectangular aperture etching is located at the side of 3 lower section of stepped impedance microstrip line, and the long side of rectangular aperture is parallel to ladder resistance
The long side of the anti-line of anti-3 medium or low resistance of microstrip line.
Two minor matters Load resonators, 2, two stepped impedance microstrip lines of the invention, two U-shaped microstrip lines 5, two it is straight
The laying of line style slot line 7 and two L-type stepped impedance slot lines 8 is about 1 central point central symmetry of medium substrate.The present invention
The minor matters of center loaded of minor matters Load resonators 2 be respectively equipped with open circuit and short-circuit two kinds of forms, can be used to separately adjustable
The centre frequency of two frequency bands.
For large scale existing for existing filter, high Insertion Loss, low selectivity and design flexibility problem, the present invention is proposed
A kind of new technical solution based on minor matters load filter
Thinking of the invention is: signal is inputted by U-shaped microstrip line, is inhibited by U-shaped microstrip line to slot line transformational structure
The transmission of common-mode signal enhances the anti-interference ability of filter；Slot line uses step electric impedance resonator, wherein L-type ladder
Impedance gap line has rotated 90 ° compared with rectilinear flights impedance gap line counterclockwise, greatly reduces the size of filter, protects simultaneously
Good common-mode rejection properties are stayed.Difference mode signal reaches stepped impedance microstrip line by stepped impedance slot line and passes through three lines
To minor matters Load resonators, the interdigital coupled modes of three lines enhance the coupling between outputting and inputting, make interdigital coupled transfer
Filter has lesser insertion loss, while can generate two transmission zeros in differential mode near pass-band；Present invention employs minor matters
Load resonators, by adjust the micro-strip resonantor center loaded minor matters can with the centre frequency of separately adjustable two passbands,
Two minor matters Load resonators generate a transmission zero by quasi- interdigital coupling, and the position of transmission zero is adjustable.Minor matters load
There are two types of forms for resonator, are minor matters open-end and minor matters terminal short circuit respectively, enhance the flexibility and convenience of design,
It conveniently adapts in different application demands.In addition, the present invention also has the characteristic of Wide stop bands.To sum up, the present invention is obviously improved
The design flexibility of double frequency differential bandpass filter and with outer selectivity, maintains higher common mode inhibition.
Embodiment 2:
The overall of double frequency differential bandpass filter based on minor matters Load resonators is constituted and specific structure is with embodiment 1,
Referring to Fig. 1, Fig. 2, the opening direction of the invention about the centrosymmetric two minor matters Load resonators 2 of medium substrate is opposite,
Referring to fig. 4 and Fig. 5, that is, the minor matters Load resonators 2 of two E types are open in opposite directions, interdigital coupling subject to coupled modes.Micro-strip
The minor matters loaded in resonator 2, or be open circuit minor matters or be short-circuit minor matters, it is respectively positioned on the c-type microstrip line formed by E type frame
Center position.Minor matters load micro-strip resonantor 2 includes the c-type microstrip line for being folded into three sections and load at c-type microstrip line center
One Duan Zhijie of position reduces the size of micro-strip resonantor by folding, and realizes multiband by load minor matters and convenient for spirit
The centre frequency living for adjusting frequency band.Two E minor matters Load resonators by quasi- interdigital coupled modes formed a transmission zero and
About medium substrate central point central symmetry, the both ends of c-type microstrip line and stepped impedance microstrip line 3 pass through the interdigital coupling line of three lines
Shape gap enhances input and output coupling, to be additionally formed two transmission zeros near pass-band to improve with outer selectivity.
Referring to fig. 4, the total length of the folded form half-wave resonator in the minor matters load micro-strip resonantor 2 of open-end is
Lr1=43.6mm, width Wr1The length of=0.7mm, micro-strip open circuit minor matters are Lr2=12mm, width Wr2=0.7mm is hindered with ladder
The spacing g of parallel coupling between anti-microstrip line 31=1.15mm, with the interdigital spacing g coupled of 3 three line of stepped impedance microstrip line2=
0.2mm。
Referring to Fig. 5, the total length of the folded form half-wave resonator in the minor matters load micro-strip resonantor 2 of terminal short circuit is
Lr1=42.4mm, width Wr1=0.8mm, the length of micro-strip short circuit minor matters are Lr2=4.3mm, width Wr2=0.8mm, short-circuit branch
Save the metallization VIA radius r of end2The spacing g of parallel coupling between=0.2mm, with stepped impedance microstrip line 31=1.1mm,
With the interdigital spacing g coupled of 3 three line of stepped impedance microstrip line2=0.3mm.
Existing difference double frequency filter two mid-band frequencies mostly can not Independent adjustable aiming at the problem that, this
Invention uses minor matters Load resonators, can be only in this configuration by adjusting the minor matters of the micro-strip resonantor center loaded
The vertical centre frequency for adjusting two frequency bands of filter；Meanwhile there are two types of forms for the minor matters Load resonators in the present invention, are respectively
Minor matters open-end and minor matters terminal short circuit enhance the flexibility and convenience of design, conveniently adapt to need in different applications
It asks, and short-circuit minor matters have further reduced the size of filter due to its inherent characteristic.In addition, present invention uses two
Resonator generates a transmission zero by quasi- interdigital coupling between two resonators, has been obviously improved double frequency difference band logical and has filtered
The design flexibility of wave device and with outer selectivity, maintains higher common mode inhibition.
Embodiment 3:
The overall of double frequency differential bandpass filter based on minor matters Load resonators is constituted with specific structure with embodiment 1-
2, referring to Fig. 1, Fig. 2, Fig. 4 and Fig. 5, stepped impedance microstrip line 3 of the invention, by the high impedance microstrip line of smaller rectangle and larger
The Low ESR microstrip line of rectangle is formed by connecting, and high impedance microstrip line end is grounded by metallization VIA 4 and beyond bottom gap
The waveguide wavelength of line a quarter microstrip line, to realize transition of the good difference mode signal from slot line to microstrip line.This two
A microstrip line is parallel with 1 long side of dielectric-slab, and in order to realize smaller size, two stepped impedance microstrip lines 3 are about medium base
Plate central point central symmetry.
Referring to fig. 4, when the minor matters loaded in minor matters Load resonators 2 are open circuit, the high impedance of stepped impedance microstrip line 3
Micro-strip line length L3=1mm, width W3=0.8mm, Low ESR micro-strip line length L4=17mm, width W4=2.4mm, inside
The interdigital width W for coupling linear gap of three line of a pair of etching5=0.65mm, the metallization VIA 4 of high impedance microstrip line end
Radius r=0.2mm.
Referring to Fig. 5, when the minor matters loaded in minor matters Load resonators 2 are short circuit, the high impedance of stepped impedance microstrip line 3
Micro-strip line length L3=1mm, width W3=0.8mm, Low ESR micro-strip line length L4=16mm, width W4=2.4mm, inside
The interdigital width W for coupling linear gap of three line of a pair of etching5=0.5mm, the metallization VIA 4 of high impedance microstrip line end
Radius r1=0.2mm.
In order to reduce the insertion loss of filter and meanwhile improve filter with outer selectivity, the present invention two are hindered in ladder
It respectively etched the linear gap of the interdigital coupling of three lines inside anti-microstrip line, pass through three lines between minor matters load micro-strip resonantor
Interdigital coupled transfer energy, enhances the coupling between outputting and inputting, and reduces the insertion loss of signal；In addition, the coupling
Mode can generate two transmission zeros in differential mode near pass-band, by adjust stepped impedance microstrip line and minor matters Load resonators it
Between slot-coupled, thus it is possible to vary the position of transmission zero, improve filter with outer selectivity.
Embodiment 4:
The overall of double frequency differential bandpass filter based on minor matters Load resonators is constituted with specific structure with embodiment 1-
3, referring to Fig. 6, stepped impedance slot line of the invention includes that one section of rectilinear flights impedance gap line 7 and one section of L-type ladder hinder
Anti- slot line 8 is connected, and etching and layout is in the lower surface of medium substrate 1, that is, is etched on metal floor 6.L-type ladder
Impedance gap line 8 has rotated 90 ° counterclockwise compared with rectilinear flights impedance gap line 7.It is wider in rectilinear flights impedance gap line 7
Rectangular aperture be etched in middle position square under straight line micro-strip in corresponding U-shaped microstrip line and along on the inside of U-shaped microstrip line, or
Person says the bottom middle position for corresponding to U-shaped microstrip line, and exceeds the straight line micro-strip bottom a quarter gap of U-shaped microstrip line 5
Line wavelength.Relatively narrow rectangular aperture is etched in corresponding to straight line micro-strip bottom in U-shaped microstrip line in rectilinear flights impedance gap line 7
The middle position of lower section and along on the outside of U-shaped microstrip line.Relatively narrow rectangular aperture location of etch in L-type stepped impedance slot line 8
Below high impedance line in stepped impedance microstrip line 3；Wider rectangular aperture etches position in L-type stepped impedance slot line 8
In the side of 3 lower section of stepped impedance microstrip line, and the long side of rectangular aperture is parallel to the anti-line of 3 medium or low resistance of stepped impedance microstrip line
Long side.L-type stepped impedance slot line 8 is beyond high impedance microstrip line in stepped impedance microstrip line 3 and Low ESR microstrip line intersection
Center a quarter slot line waveguide wavelength.Two sections of stepped impedance slot lines with it is U-shaped defeated on surface medium substrate 1
Enter microstrip line 5 and form transformational structure of the signal from microstrip line to slot line, be used for transmission difference mode signal and realize intrinsic common mode
Signal inhibits；Input/output rectilinear flights impedance gap line 7 and L-type stepped impedance slot line 8 are about medium substrate center
Dot center is symmetrical；L in rectilinear flights impedance gap line 7s1=9mm, Ls2=5.55mm, width Ws1=5mm, Ws2=0.15mm；
L in L-type stepped impedance slot line 8s3=9.85mm, Ls4=7mm, width Ws4=3.3mm.
Different from most of differential microstrips-slot line transmission structure, U-shaped microstrip line and stepped impedance in the present invention are stitched
Gap line is about dielectric-slab central point central symmetry, and L-type stepped impedance slot line is counterclockwise compared with rectilinear flights impedance gap line
90 ° are had rotated, the size of filter is greatly reduced, while remaining good common-mode rejection properties.
Embodiment 5:
The overall of double frequency differential bandpass filter based on minor matters Load resonators is constituted with specific structure with embodiment 1-
4, referring to Fig. 3, U-shaped microstrip line 5 of the invention connected by straight line micro-strip bottom with the straight line micro-strip arm that two are parallel to each other and
At two U-shaped microstrip lines can be used as the U-shaped microstrip line of input or the U-shaped microstrip line of output, and about medium substrate central point
Central symmetry, straight line micro-strip arm is used for while inputting difference mode signal and common-mode signal in U-shaped microstrip line 5 of the invention, and straight line is micro-
Impedance with bottom and straight line micro-strip arm is 50 Ω, to guarantee that feed port matching is good.Two of U-shaped input microstrip feed line 5
The length L of micro-strip arm1=12.4mm, line width W1=2.4mm, the length L at micro-strip bottom2=15.2mm, width W2=2.4mm, away from Jie
The distance of matter substrate boundaries is respectively 4.8mm and 9.2mm.
About a symmetrical axial symmetry parallel with dielectric-slab side length, this causes to correspond to U most of U-shaped microstrip line constructions
The micro-strip resonantor of the slot line of the etching of dielectric-slab lower surface and dielectric-slab upper surface all must edge immediately below type microstrip line
This straight line symmetry axis distribution, this often increases the size of filter, and present invention employs about medium substrate central point
Centrosymmetric U-shaped microstrip line, corresponding slot line and micro-strip resonantor are also about medium substrate central point central symmetry, in this way
The micro-strip resonantor of upper surface and the slot line of lower surface can misplace placement, greatly reduce the size of filter.In addition, this
The impedance of the straight line micro-strip bottom of U-shaped microstrip line and straight line micro-strip arm is 50 Ω in invention, keeps the matching of feed port better
Good, the filter for being has lesser insertion loss.
The present invention is directed to improve the flexibility of double frequency difference filter design and with outer selectivity.Successfully solves existing filter
Wave device single frequency band, high Insertion Loss, low selectivity and lack the technical problems such as design flexibility.
Providing two again below, the present invention is further described for specific example in further detail:
Embodiment 6:
The overall of double frequency differential bandpass filter based on minor matters Load resonators is constituted with specific structure with embodiment 1-
5。
Referring to Fig.1, a kind of double frequency differential bandpass filter based on open circuit minor matters Load resonators, including medium substrate 1,
The upper surface of the medium substrate 1 is printed with about the centrosymmetric two open circuit minor matters load micro-strip resonantor of dielectric-slab central point
2, two pass through the interdigital stepped impedance microstrip line 3 coupled of three lines, two stepped impedance microstrip lines 3 with minor matters Load resonators 2
End respectively there is metallization VIA 4 to be grounded, two minor matters load 2 both sides of micro-strip resonantor are printed with U-shaped microstrip line 5, defeated
Enter and exports U-shaped microstrip line about dielectric-slab central point central symmetry；The lower surface of medium substrate 1 is with being printed with metal in this example
Plate 6 corresponds to the side of U-shaped microstrip line 5 on the metal floor 6, is etched with mutually connected rectilinear flights impedance gap line 7
With L-type stepped impedance slot line 8.Wherein:
Medium substrate 1 in this example uses relative dielectric constant for 2.2, and size is 53.7mm × 34mm, with a thickness of 0.8mm
Rectangle F4BM-2 material.
Referring to Fig. 3, U-shaped microstrip line 5 is connected by the straight line micro-strip arm that straight line micro-strip bottom and two are parallel to each other in this example
It connects, two U-shaped microstrip lines are about medium substrate central point central symmetry, and straight line micro-strip arm is for simultaneously in U-shaped microstrip line 5
Difference mode signal and common-mode signal are inputted, the impedance of straight line micro-strip bottom and straight line micro-strip arm is 50 Ω, to guarantee feed port
With good.The length L of two micro-strip arms of U-shaped input microstrip feed line 51=12.4mm, line width W1=2.4mm, the length at micro-strip bottom
L2=15.2mm, width W2=2.4mm, the distance away from medium substrate boundary are respectively 4.8mm and 9.2mm.
Referring to Fig. 4, open circuit minor matters load micro-strip resonantor 2 includes c-type microstrip line and the load for being folded into three sections in this example
The minor matters that a section termination in c-type microstrip line center is opened a way, reduce the size of micro-strip resonantor by folding, pass through load
Minor matters realize multiband and centre frequency and bandwidth convenient for flexible modulation frequency band.Two open circuit minor matters Load resonators are opened
Mouth direction is opposite, that is to say, that direction is opposite, forms a transmission zero by quasi- interdigital coupled modes and about medium substrate
Central point central symmetry, interdigital couple linear gap enhancing defeated by three lines for the both ends of c-type microstrip line and stepped impedance microstrip line 3
Enter output coupling, is additionally formed two transmission zeros near pass-band to improve with outer selectivity；Stepped impedance is micro- in this example
Band line 3, is formed by connecting by the high impedance microstrip line of smaller rectangle and the Low ESR microstrip line of larger rectangle, high impedance microstrip line end
End is grounded and is exceeded the waveguide wavelength of bottom slot line a quarter microstrip line by metallization VIA 4, and two microstrip lines are equal
Parallel with dielectric-slab long side, high impedance microstrip line is to realize transition of the difference mode signal from slot line to microstrip line；Minor matters load
The total length of folded form half-wave resonator in micro-strip resonantor 2 is Lr1=43.6mm, width Wr1=0.7mm, micro-band branch
Length be Lr2=12mm, width Wr2The spacing g of parallel coupling between=0.7mm, with stepped impedance microstrip line 31=1.15mm,
With the interdigital spacing g coupled of 3 three line of stepped impedance microstrip line2=0.2mm；The high impedance micro-strip wire length of stepped impedance microstrip line 3
Spend L3=1mm, width W3=0.8mm, Low ESR micro-strip line length L4=17mm, width W4=2.4mm, the one of etched inside
The width W that couples linear gap interdigital to three lines5=0.65mm, the radius r=of the metallization VIA 4 of high impedance microstrip line end
0.2mm。
Referring to Fig. 6, rectilinear flights impedance gap line 7 in this example, by one section of wider rectangular aperture and one section compared with narrow slot
It is formed by connecting；Be located in U-shaped microstrip line 5 immediately below straight line micro-strip bottom, and a narrow side of wider rectangular aperture with it is U-shaped micro-
Inner edge with straight line micro-strip bottom in line 5 is overlapped, and exceeds the straight line micro-strip bottom a quarter slot line wavelength of U-shaped microstrip line 5, this
L-type stepped impedance slot line 8 in example, is made of, relatively narrow seam one section of relatively narrow linear gap line and one section of wider gap
Gap line passes through the underface of high impedance microstrip line and Low ESR microstrip line intersection in stepped impedance microstrip line 3 and has exceeded four points
One of slot line waveguide wavelength, 5 groups of U-shaped input microstrip line in two sections of stepped impedance slot lines and surface medium substrate 1
At transformational structure of the signal from microstrip line to slot line, it is used for transmission difference mode signal and realizes that intrinsic common-mode signal inhibits；It is defeated
Enter/export rectilinear flights impedance gap line and L-type stepped impedance slot line about medium substrate central point central symmetry；Directly
L in line style stepped impedance slot line 7s1=9mm, Ls2=5.55mm, width Ws1=5mm, Ws2=0.15mm；L-type stepped impedance seam
L in gap line 8s3=9.85mm, Ls4=7mm, width Ws4=3.3mm.
Present invention employs the forms of micro-strip resonantor minor matters open-end, by adjusting the micro-strip resonantor center loaded
Minor matters, the flexibility and convenience of design can be enhanced with the centre frequency of separately adjustable two frequency bands of filter.It is different from
Most of differential microstrips-slot line transmission structure, the present invention in U-shaped microstrip line and stepped impedance slot line about dielectric-slab
Central point central symmetry, and L-type stepped impedance slot line has rotated 90 ° compared with rectilinear flights impedance gap line counterclockwise, significantly
The size of filter is reduced, while remaining good common-mode rejection properties.
The present invention with minor matters due to bearing in a pair of linear gap of the interdigital coupling of three lines of stepped impedance microstrip line etched inside
It carries between micro-strip resonantor through the interdigital coupled transfer energy of three lines, enhances the coupling between outputting and inputting, have lesser
Insertion loss；The coupled modes can generate two transmission zeros in differential mode near pass-band, use single resonance compared to most of
The filter of device generates a transmission zero by quasi- interdigital coupling between two resonators present invention uses two resonators
Point, by adjusting the slot-coupled between stepped impedance microstrip line and minor matters Load resonators, thus it is possible to vary the position of transmission zero
It sets, be obviously improved the design flexibility of double frequency differential bandpass filter and with outer selectivity, maintain higher common mode
Inhibit.In addition, the present invention has the characteristic of Wide stop bands, the selectivity of filter is enhanced.
Embodiment 7:
The overall of double frequency differential bandpass filter based on minor matters Load resonators is constituted with specific structure with embodiment 1-
5。
Referring to Fig. 2, a kind of double frequency differential bandpass filter based on short-circuit minor matters Load resonators, including medium substrate 1,
The upper surface of the medium substrate 1 is printed with about dielectric-slab central point centrosymmetric two short-circuit minor matters load micro-strip resonantors
2, there are the ground connection of metallization VIA 9 in two short-circuit minor matters ends, and two couple with short-circuit minor matters Load resonators by the way that three lines are interdigital
Stepped impedance microstrip line 3, the end of two stepped impedance microstrip lines 3 respectively has metallization VIA 4 to be grounded, and two minor matters are negative
2 both sides of micro-strip resonantor are carried to be printed with about the centrosymmetric U-shaped input microstrip line of dielectric-slab central point and U-shaped output microstrip line
5, the lower surface of medium substrate 1 is printed with metal floor 6 in this example, and the side of U-shaped microstrip line 5, erosion are located on the metal floor 6
It is carved with mutually connected rectilinear flights impedance gap line 7 and L-type stepped impedance slot line 8.Wherein:
Medium substrate 1 in this example uses relative dielectric constant for 2.2, and size is 51.7mm × 34mm, with a thickness of 0.8mm
Rectangle F4BM-2 material.
Referring to Fig. 3, U-shaped microstrip line 5 is connected by the straight line micro-strip arm that straight line micro-strip bottom and two are parallel to each other in this example
It connects, two U-shaped microstrip lines are about medium substrate central point central symmetry, and straight line micro-strip arm is for simultaneously in U-shaped microstrip line 5
Difference mode signal and common-mode signal are inputted, the impedance of straight line micro-strip bottom and straight line micro-strip arm is 50 Ω, to guarantee feed port
With good.The length L of two micro-strip arms of U-shaped input microstrip feed line 51=12.4mm, line width W1=2.4mm, the length at micro-strip bottom
L2=15.2mm, width W2=2.4mm, the distance away from medium substrate boundary are respectively 4.8mm and 9.2mm.
Referring to Fig. 5, minor matters load micro-strip resonantor 2 includes the c-type microstrip line for being folded into three sections and load in c-type in this example
The minor matters of the section termination short circuit of microstrip line center reduce the size of micro-strip resonantor by folding, by loading minor matters
Realize multiband and centre frequency and bandwidth convenient for flexible modulation frequency band.The opening direction phase of two minor matters Load resonators
To, and about medium substrate central point central symmetry, the both ends of c-type microstrip line and stepped impedance microstrip line 3 are interdigital by three lines
Linear gap enhancing input and output coupling is coupled, to be additionally formed three transmission zeros near pass-band to improve with outer choosing
Selecting property；Ladder impedance micro-strip 3 in this example is connected by the high impedance microstrip line of smaller rectangle and the Low ESR microstrip line of larger rectangle
It connects, high impedance microstrip line end is grounded and is exceeded the wave of bottom slot line a quarter microstrip line by metallization VIA 4
Guide wavelength, two microstrip lines are parallel with dielectric-slab long side, high impedance microstrip line to realize difference mode signal from slot line to
The transition of microstrip line；The total length that minor matters load the folded form half-wave resonator in micro-strip resonantor 2 is Lr1=42.4mm, it is wide
Spend Wr1=0.8mm, the length of micro-band branch are Lr2=4.3mm, width Wr2=0.8mm, the metallization VIA of micro-band branch end
Radius r2The spacing g of parallel coupling between=0.2mm, with stepped impedance microstrip line 31=1.1mm, with stepped impedance microstrip line 3 three
The spacing g of the interdigital coupling of line2=0.3mm；The high impedance micro-strip line length L of stepped impedance microstrip line 33=1mm, width W3=
0.8mm, Low ESR micro-strip line length L4=16mm, width W4=2.4mm, the interdigital coupling of three line of a pair of etched inside are linear
The width W in gap5=0.5mm, the radius r of the metallization VIA 4 of high impedance microstrip line end1=0.2mm.
Referring to Fig. 6, rectilinear flights impedance gap line 7 in this example, by one section of wider rectangular aperture and one section compared with narrow slot
It is formed by connecting；Be located in U-shaped microstrip line 5 immediately below straight line micro-strip bottom, and a narrow side of wider rectangular aperture with it is U-shaped micro-
Inner edge with straight line micro-strip bottom in line 5 is overlapped, and exceeds the straight line micro-strip bottom a quarter slot line wavelength of U-shaped microstrip line 5, this
L-type stepped impedance slot line 8 in example, is made of, relatively narrow seam one section of relatively narrow linear gap line and one section of wider gap
Gap line passes through the underface of high impedance microstrip line and Low ESR microstrip line intersection in stepped impedance microstrip line 3 and has exceeded four points
One of slot line waveguide wavelength, 5 groups of U-shaped input microstrip line in two sections of stepped impedance slot lines and surface medium substrate 1
At transformational structure of the signal from microstrip line to slot line, it is used for transmission difference mode signal and realizes that intrinsic common-mode signal inhibits；It is defeated
Enter/export rectilinear flights impedance gap line and L-type stepped impedance slot line about medium substrate central point central symmetry；Directly
L in line style stepped impedance slot line 7s1=9mm, Ls2=5.55mm, width Ws1=5mm, Ws2=0.15mm；L-type stepped impedance seam
L in gap line 8s3=9.85mm, Ls4=7mm, width Ws4=3.3mm.
Present invention employs the forms of micro-strip resonantor minor matters terminal short circuit, by adjusting the micro-strip resonantor center loaded
Minor matters, the flexibility and convenience of design can be enhanced with the centre frequency of separately adjustable two frequency bands of filter.It is different from
Most of differential microstrips-slot line transmission structure, the present invention in U-shaped microstrip line and stepped impedance slot line about dielectric-slab
Central point central symmetry, and L-type stepped impedance slot line has rotated 90 ° compared with rectilinear flights impedance gap line counterclockwise, significantly
The size of filter is reduced, while remaining good common-mode rejection properties.In addition, short-circuit minor matters are due to its inherent characteristic,
The size of filter is further reduced.
The present invention with minor matters due to bearing in a pair of linear gap of the interdigital coupling of three lines of stepped impedance microstrip line etched inside
It carries between micro-strip resonantor through the interdigital coupled transfer energy of three lines, enhances the coupling between outputting and inputting, have lesser
Insertion loss；The coupled modes can generate two transmission zeros in differential mode near pass-band, use single resonance compared to most of
The filter of device generates a transmission zero by quasi- interdigital coupling between two resonators present invention uses two resonators
Point, by adjusting the slot-coupled between stepped impedance microstrip line and minor matters Load resonators, thus it is possible to vary the position of transmission zero
It sets, be obviously improved the design flexibility of double frequency differential bandpass filter and with outer selectivity, maintain higher common mode
Inhibit.The present invention also with the characteristic of Wide stop bands, enhances the selectivity of filter simultaneously.
The working principle of the invention is: when signal is inputted by U-shaped input microstrip line, micro-strip difference mode signal therein is motivated
The electric field of lower section the first stepped impedance slot line, and micro-strip common-mode signal can not evoke the electric field of the first stepped impedance slot line,
Only have difference mode signal to be able to pass through rectilinear flights impedance gap line and be transmitted to L-type stepped impedance slot line in this way, common mode letter
It number is inhibited, the transition structure that difference mode signal passes through stepped impedance slot line to stepped impedance microstrip line again is transmitted to upper layer
Stepped impedance microstrip line, and it is humorous by two open circuits/minor matters load micro-strip that the interdigital coupling of three lines transmits a signal to centre
Shake device, enhances input and output coupling, so that three transmission zeros are formed near pass-band, for improving the selection of filter
Property.
Below with reference to measured result, technical effect of the invention is described further:
Embodiment 8:
The overall of double frequency differential bandpass filter based on minor matters Load resonators is constituted with specific structure with embodiment 1-
7。
Measurement experiment content:
Using vector network analyzer N5230A to the double frequency difference based on open circuit minor matters Load resonators in the present invention
Bandpass filter and double frequency differential bandpass filter based on short-circuit minor matters Load resonators have carried out one He of measurement experiment respectively
Two, experiment one tests the differential mode return loss of the double frequency differential bandpass filterAnd Differential Mode insertion lossExperiment knot
Fruit sees Fig. 7 and Fig. 8；Experiment two tests the common mode return loss of the double frequency differential bandpass filterAnd Common Mode insertion loss Experimental result is shown in Fig. 9 and Figure 10.
Measurement experiment result and analysis:
Fig. 7 is the differential mode return loss and difference of the double frequency difference filter of the invention based on open circuit minor matters Load resonators
The S parameter measured drawing of mould insertion loss, wherein differential mode return loss is usedIt indicates, Differential Mode insertion loss is usedIt indicates.Fig. 7's
Abscissa is frequency, unit GHz；Ordinate is S parameter, and unit is dB.It is with the curve of solid squares symbol in Fig. 7Curve with empty circles symbol is
The centre frequency of two differential mode passbands is respectively 2.50GHz and 3.60GHz in the present embodiment, and absolute bandwidth is (opposite
Bandwidth) it is respectively 209.2MHz and 173.5MHz (8.68% and 4.99%)；Maximum differential mode echo damage in first differential mode passband
ConsumptionFor 35.4dB, minimum Differential Mode insertion lossFor 2.05dB；Maximum differential mode return loss in second differential mode passbandFor 15.84dB, minimum Differential Mode insertion lossFor 2.28dB；There are 1 transmission zero on the left of first differential mode passband, it is located at
At 1.8GHz, there are a transmission zeros between the first, second differential mode passband, are located at 2.67GHz, on the right side of the second differential mode passband
There are a transmission zeros, are located at 3.76GHz, from figure 7 it can be seen that the filter has lesser insertion loss, simultaneously should
Three transmission zeros are significantly improved with outer selectivity.
Fig. 8 is the common mode return loss of the double frequency difference filter of the invention based on open circuit minor matters Load resonators and is total to
The S parameter measured drawing of mould insertion loss, wherein common mode return loss is usedIt indicates, Common Mode insertion loss is usedIt indicates.Fig. 8's
Abscissa is frequency, unit GHz；Ordinate is S parameter, and unit is dB.It is with the curve of solid squares symbol in Fig. 8Curve with empty circles symbol is
Common mode return loss in the present embodimentIt is less than or equal to 0.40dB, common mode insertion damage within the scope of working frequency range
ConsumptionMore than or equal to 38.5dB, shown from the data of Fig. 8 as can be seen that double frequency differential bandpass filter of the invention is working
Significant common mode inhibition is effectively realized in frequency band.
Embodiment 9:
The overall of double frequency differential bandpass filter based on minor matters Load resonators is constituted with specific structure with embodiment 1-
7, measurement experiment content is the same as embodiment 8.
Measurement experiment result and analysis:
Fig. 9 is the differential mode return loss and difference of the double frequency difference filter of the invention based on short-circuit minor matters Load resonators
The S parameter measured drawing of mould insertion loss, wherein differential mode return loss is usedIt indicates, Differential Mode insertion loss is usedIt indicates.Fig. 9's
Abscissa is frequency, unit GHz；Ordinate is S parameter, and unit is dB.It is with the curve of solid squares symbol in Fig. 9Curve with empty circles symbol is
The centre frequency of two differential mode passbands is respectively 1.94GHz and 2.55GHz in the present embodiment, and absolute bandwidth is (opposite
Bandwidth) it is respectively 169.6MHz and 207.8MHz (8.93% and 8.31%)；Maximum differential mode echo damage in first differential mode passband
ConsumptionFor 20.15dB, minimum Differential Mode insertion lossFor 2dB；Maximum differential mode return loss in second differential mode passband
For 19.85dB, minimum Differential Mode insertion lossFor 1.92dB；There are 1 transmission zero on the left of first differential mode passband, it is located at
At 1.75GHz, there are a transmission zeros between the first, second differential mode passband, are located at 2.2GHz, on the right side of the second differential mode passband
There are a transmission zeros, are located at 2.75GHz, from fig. 9, it can be seen that the filter has lesser insertion loss, simultaneously should
Three transmission zeros are significantly improved with outer selectivity.
Figure 10 be the double frequency difference filter of the invention based on short-circuit minor matters Load resonators common mode return loss and
The S parameter measured drawing of Common Mode insertion loss, wherein common mode return loss is usedIt indicates, Common Mode insertion loss is usedIt indicates.Figure
10 abscissa is frequency, unit GHz；Ordinate is S parameter, and unit is dB.The song of solid squares symbol is had in Figure 10
Line isCurve with empty circles symbol is
Common mode return loss in the present embodimentIt is less than or equal to 0.28dB, common mode insertion damage within the scope of working frequency range
ConsumptionMore than or equal to 40dB, from fig. 10 it can be seen that double frequency differential bandpass filter of the present invention realizes significant common mode suppression
System.
In brief, a kind of double frequency differential bandpass filter based on minor matters Load resonators proposed by the present invention.It solves
The problem of high Insertion Loss of existing filter, low selectivity and scarce flexible design.There are two phases placed in the middle for the printing of medium substrate upper surface
To forming the minor matters Load resonators of quasi- interdigital coupling, two stepped impedance microstrip lines and two for forming the interdigital coupling of three lines therewith
The U-shaped microstrip line of side；There are two rectilinear flights impedance gap line and two for etching on the metal floor of medium substrate lower surface
The L-type stepped impedance slot line being rotated by 90 ° counterclockwise compared with rectilinear flights impedance gap line.The above circuit structure is about medium
Dot center, substrate center is symmetrical.All structures of present media substrate upper and lower surface are about medium substrate central point central symmetry
90 ° of bending designs of design and stepped impedance slot line, greatly reduce filter size；Quasi- interdigital coupling and the interdigital coupling of three lines
Structure reduces filter insertion loss and forms three transmission zeros, enhances filter selectivity；The minor matters of center loaded
There are open circuit and short-circuit two kinds of forms, conveniently adapts to different application demands.
Claims (5)
1. a kind of double frequency differential bandpass filter based on minor matters Load resonators includes medium substrate (1), the medium substrate
(1) there are two minor matters load micro-strip resonantor (2), two stepped impedance microstrip lines (3), two minor matters loads for upper surface printing
Micro-strip resonantor (2) both sides are printed with U-shaped microstrip line (5), and the lower surface of the medium substrate (1) is printed with metal floor (6),
It is located at the side of U-shaped microstrip line (5) on the metal floor (6), is etched with stepped impedance slot line；It is characterized by:
Described two minor matters loads micro-strip resonantor (2) position is placed in the middle, is the minor matters Load resonators of one section of E type, two E respectively
The minor matters Load resonators opening of type is opposite；Stepped impedance is equipped on the outside of the E type structure of the minor matters Load resonators of two E types
Microstrip line (3), E type structure lateral face are inserted into the groove of the anti-line end of stepped impedance microstrip line (3) medium or low resistance, and three lines are formed
Interdigital coupling；
The stepped impedance microstrip line (3) is connected by the high impedance microstrip line of rectangle with the Low ESR microstrip line of rectangle, high impedance
There is the metallization VIA (4) of a ground connection in line end；
The stepped impedance slot line includes one section of rectilinear flights impedance gap line (7) and one section of L-type stepped impedance slot line
(8) it is connected, L-type stepped impedance slot line (8) has rotated 90 ° counterclockwise compared with rectilinear flights impedance gap line (7)；Linear type rank
Terraced impedance gap line (7) etching corresponds to middle position square under straight line micro-strip in U-shaped microstrip line；L-type stepped impedance gap
Line (8) etching corresponds in stepped impedance microstrip line (3) below high impedance line；
Two minor matters Load resonators (2), two stepped impedance microstrip lines, two U-shaped microstrip lines (5), two straight lines
Type slot line (7) and two L-type stepped impedance slot lines (8) are about medium substrate (1) central point central symmetry；The branch
The minor matters for saving the center loaded of Load resonators (2) are respectively equipped with open circuit and short-circuit two kinds of forms, can be used to separately adjustable two
The centre frequency of a frequency band.
2. a kind of double frequency differential bandpass filter based on minor matters Load resonators according to claim 1, feature exist
In minor matters Load resonators (2) opening of described two E types is opposite, interdigital coupling subject to coupled modes.
3. a kind of double frequency differential bandpass filter based on minor matters Load resonators according to claim 1, feature exist
In the minor matters Load resonators that, the micro-strip resonantor (2) is E type, wherein the minor matters loaded, or be open circuit minor matters or be short-circuit
Minor matters are respectively positioned on the center position of the c-type microstrip line formed by E type frame.
4. the double frequency differential bandpass filter according to claim 1 based on minor matters Load resonators, it is characterised in that: institute
Rectilinear flights impedance gap line (7) is stated, is formed by connecting by one section of wider rectangular aperture and one section compared with narrow slot；It corresponds respectively to
In U-shaped microstrip line (5) immediately below straight line micro-strip bottom, and a narrow side of wider rectangular aperture and straight line in U-shaped microstrip line (5) are micro-
The inner edge bottom of with is overlapped, and exceeds the straight line micro-strip bottom a quarter slot line wavelength of U-shaped microstrip line (5), the L-type ladder resistance
Anti- slot line (8) is made of one section of relatively narrow linear gap line and one section of wider gap, and relatively narrow slot line passes through ladder
The underface of high impedance microstrip line and Low ESR microstrip line intersection and a quarter gap is had exceeded in impedance micro-strip (3)
Line waveguide wavelength, rectilinear flights impedance gap line (7) and L-type stepped impedance slot line (8) are about medium substrate central point
Central symmetry.
5. a kind of double frequency differential bandpass filter based on minor matters Load resonators according to claim 1, feature exist
In, described two U-shaped microstrip lines (5), the straight line micro-strip arm being parallel to each other by straight line micro-strip bottom and two is formed by connecting,
And two U-shaped microstrip lines can be used as input or output microstrip line, and about about medium substrate central point central symmetry, institute
The impedance at the straight line micro-strip bottom and straight line micro-strip arm of stating U-shaped microstrip line is 50 Ω.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994095A (en) * | 2019-12-11 | 2020-04-10 | 京信通信技术(广州)有限公司 | Low pass filter, millimeter wave AAU system and communication device |
| CN111463527A (en) * | 2020-03-05 | 2020-07-28 | 东北大学秦皇岛分校 | Dual-band-pass filter based on unequal-length cross-shaped resonator and design method |
| CN111769347A (en) * | 2020-07-31 | 2020-10-13 | 西安电子科技大学 | Differential ultra-wideband band-pass filter based on multimode slot line resonator |
| CN112350042A (en) * | 2020-11-20 | 2021-02-09 | 西安电子科技大学 | Single-ended to differential magic T with filtering characteristics |
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| CN112952319A (en) * | 2021-03-11 | 2021-06-11 | 电子科技大学 | Microstrip dual-passband filter with independently controllable passband based on zero-degree feed structure |
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| CN116845511A (en) * | 2023-06-19 | 2023-10-03 | 电子科技大学 | Microstrip band-pass filter with a plurality of transmission zeros |
| CN117913486A (en) * | 2024-03-19 | 2024-04-19 | 微网优联科技(成都)有限公司 | Low-insertion-loss low-cost multi-zero miniaturized microstrip filter |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2184801A1 (en) * | 2008-11-07 | 2010-05-12 | Commissariat à l'Energie Atomique | Differential filtering device with coplanar coupled resonators and filtering antenna furnished with such a device |
| US20120075039A1 (en) * | 2010-09-28 | 2012-03-29 | Guyette Andrew C | Tuning Bandwidth and Center Frequencies In a Bandpass Filter |
| ES2396773A1 (en) * | 2011-06-01 | 2013-02-26 | Universitat Autonoma De Barcelona | Device comprising differential transmission lines with common-mode suppression |
| CN206961986U (en) * | 2017-03-24 | 2018-02-02 | 六盘水师范学院 | A kind of wide-band microwave low pass filter |
| CN107834134A (en) * | 2017-10-26 | 2018-03-23 | 上海海事大学 | Miniaturization difference filter based on T-shaped branch's cable architecture |
| CN109546272A (en) * | 2018-11-01 | 2019-03-29 | 西安电子科技大学 | A kind of double frequency differential bandpass filter |
| CN109742496A (en) * | 2019-01-08 | 2019-05-10 | 西安电子科技大学 | Broadband bandpass filter based on nested annular and slot line resonator |
| CN109755702A (en) * | 2019-03-10 | 2019-05-14 | 西安电子科技大学 | A kind of four frequency differential bandpass filters |
| CN109841933A (en) * | 2019-03-11 | 2019-06-04 | 南通大学 | A kind of Compact type broadband differential bandpass filter |
-
2019
- 2019-08-06 CN CN201910722709.5A patent/CN110444840B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2184801A1 (en) * | 2008-11-07 | 2010-05-12 | Commissariat à l'Energie Atomique | Differential filtering device with coplanar coupled resonators and filtering antenna furnished with such a device |
| US20120075039A1 (en) * | 2010-09-28 | 2012-03-29 | Guyette Andrew C | Tuning Bandwidth and Center Frequencies In a Bandpass Filter |
| ES2396773A1 (en) * | 2011-06-01 | 2013-02-26 | Universitat Autonoma De Barcelona | Device comprising differential transmission lines with common-mode suppression |
| CN206961986U (en) * | 2017-03-24 | 2018-02-02 | 六盘水师范学院 | A kind of wide-band microwave low pass filter |
| CN107834134A (en) * | 2017-10-26 | 2018-03-23 | 上海海事大学 | Miniaturization difference filter based on T-shaped branch's cable architecture |
| CN109546272A (en) * | 2018-11-01 | 2019-03-29 | 西安电子科技大学 | A kind of double frequency differential bandpass filter |
| CN109742496A (en) * | 2019-01-08 | 2019-05-10 | 西安电子科技大学 | Broadband bandpass filter based on nested annular and slot line resonator |
| CN109755702A (en) * | 2019-03-10 | 2019-05-14 | 西安电子科技大学 | A kind of four frequency differential bandpass filters |
| CN109841933A (en) * | 2019-03-11 | 2019-06-04 | 南通大学 | A kind of Compact type broadband differential bandpass filter |
Non-Patent Citations (1)
| Title |
|---|
| 程星钰: "一种超宽带的微带差分带通滤波器的设计", 《2019年全国微波毫米波会议论文集》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994095A (en) * | 2019-12-11 | 2020-04-10 | 京信通信技术(广州)有限公司 | Low pass filter, millimeter wave AAU system and communication device |
| CN110994095B (en) * | 2019-12-11 | 2024-04-26 | 京信网络系统股份有限公司 | Low-pass filter, millimeter wave AAU system and communication device |
| CN111463527A (en) * | 2020-03-05 | 2020-07-28 | 东北大学秦皇岛分校 | Dual-band-pass filter based on unequal-length cross-shaped resonator and design method |
| CN111769347A (en) * | 2020-07-31 | 2020-10-13 | 西安电子科技大学 | Differential ultra-wideband band-pass filter based on multimode slot line resonator |
| CN112350042B (en) * | 2020-11-20 | 2021-08-20 | 西安电子科技大学 | Single-ended to differential magic T with filtering characteristics |
| CN112350042A (en) * | 2020-11-20 | 2021-02-09 | 西安电子科技大学 | Single-ended to differential magic T with filtering characteristics |
| CN112768854A (en) * | 2020-12-29 | 2021-05-07 | 西安空间无线电技术研究所 | High-selectivity differential dual-passband microstrip filter based on stepped impedance resonator |
| CN112952319A (en) * | 2021-03-11 | 2021-06-11 | 电子科技大学 | Microstrip dual-passband filter with independently controllable passband based on zero-degree feed structure |
| CN115425940A (en) * | 2022-08-30 | 2022-12-02 | 北京邮电大学 | Construction method of microstrip multiplexer with continuous pass band, microstrip multiplexer and device |
| CN115548659A (en) * | 2022-09-21 | 2022-12-30 | 重庆邮电大学 | Filtering patch antenna applied to industrial field integrated HMSIW cavity |
| CN116845511A (en) * | 2023-06-19 | 2023-10-03 | 电子科技大学 | Microstrip band-pass filter with a plurality of transmission zeros |
| CN117913486A (en) * | 2024-03-19 | 2024-04-19 | 微网优联科技(成都)有限公司 | Low-insertion-loss low-cost multi-zero miniaturized microstrip filter |
| CN117913486B (en) * | 2024-03-19 | 2024-05-28 | 微网优联科技(成都)有限公司 | Low-insertion-loss low-cost multi-zero miniaturized microstrip filter |
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