CN106981707A - A kind of novel miniaturization wideband microband bandpass filter - Google Patents
A kind of novel miniaturization wideband microband bandpass filter Download PDFInfo
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- CN106981707A CN106981707A CN201611174448.0A CN201611174448A CN106981707A CN 106981707 A CN106981707 A CN 106981707A CN 201611174448 A CN201611174448 A CN 201611174448A CN 106981707 A CN106981707 A CN 106981707A
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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
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20381—Special shape resonators
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Abstract
The invention discloses a kind of novel miniaturization wideband microband bandpass filter, including：Two symmetrical three lines coupled structures and a multimode resonator structure cascade；The multimode resonator structural level is associated in two symmetrical three lines coupled structures.A kind of new minimized wide-band microstrip bandpass filter purpose of design that the present invention is provided is the Wideband microstrip filter structure to form miniaturization, can easily be accommodated, be easy to engineer applied.That is, the mode cascaded present invention utilizes three line coupled structures and multimode resonator structure is realized, design, emulate, optimize, process for engineer applied and test multigroup different frequency range Novel Filter simultaneously, complete the function such as signal screening and signal suppression, and it is successfully reduced design size, and be used successfully among the design of frequency conversion assembly module, and passed through system checking.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of novel miniaturization wideband microband bandpass filter.
Background technology
Existing microstrip bandpass filter mainly relies on the design philosophy of parallel coupling line band-pass filter, and then derivative is set out
The microstrip bandpass filter models such as clip-type wave filter, cross-couplings mode filter, fundamental design idea is all to utilize microstrip line group
Into multiple parallel resonator structures, carried out the elimination function of pair signals, existing microstrip bandpass filter designs median filter
Size is larger, influences the physical parameter of electrical property generally minimum, it is impossible to debug, influenceed greatly by mismachining tolerance, while some
It is difficult layout under the stricter fixed structure of structural requirement.
The content of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of novel miniaturization wideband microband bandpass filter, to complete
It is complete or at least part of solve the above problems.
To solve the above problems, the present invention is mainly achieved through the following technical solutions：
The invention provides a kind of novel miniaturization wideband microband bandpass filter, including：Two symmetrical three lines couplings
Structure and a multimode resonator structure cascade；The multimode resonator structural level is associated in two symmetrical three lines coupled structures
On.
Further, the three lines coupled structure and the multimode resonator structure use the sheet materials of ROGERS 5880, dielectric
Constant is 2.2, and thickness is 0.508mm, and the sheet material is externally provided with copper sheet, and the thickness of copper sheet is 0.018mm.
Further, the copper sheet surface uses surface turmeric technique.
Further, the circuit model of the three lines coupled structure and the multimode resonator structure is analyzed, point
The transfer function of its input/output port is not calculated, and calculates the structure that two group of three line coupled structure and multimode resonator are combined
Transfer function, three line coupled structures and the multimode resonator knot according to sheet material parameter, centre frequency and bandwidth calculation
The physical parameter of structure, and three line coupled structures and multimode resonator structure link position parameter are calculated, pass through one group of ground via
Microstrip structure completes the function of the horizontal microstrip line construction shorted to earth of bottom.
Further, the three lines coupled structure includes：Three groups of horizontal microstrip line constructions, one group of longitudinal microstrip line construction with
And one group of ground via microstrip structure；
In described three groups horizontal microstrip line constructions, from top to bottom, one group of the top is after open-circuit structure, middle one group of connection
The output port of continuous structure, one group of bottom are short-circuit structure；
Described one group longitudinal microstrip line construction completes the horizontal microstrip line construction of three groups of connection, and is used as signal input part
Mouthful.
The present invention has the beneficial effect that：
A kind of new minimized wide-band microstrip bandpass filter purpose of design that the present invention is provided be to be formed miniaturization, easily
In the Wideband microstrip filter structure for adjusting, being easy to engineer applied.Present invention utilizes three line coupled structures and multimode are humorous
Device structure of shaking cascade mode realized, while design, emulate, optimize, process for engineer applied and test it is multigroup not
With frequency range Novel Filter, complete signal screening and signal and the function such as suppress, and be successfully reduced design size, and into
Work(is used among the design of frequency conversion assembly module, and has passed through system checking.
Other features and advantages of the present invention will illustrate in the following description, and partial become from specification
It is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can by the specification write,
Specifically noted structure is realized and obtained in claims and accompanying drawing.
Brief description of the drawings
Fig. 1 is three line coupled structure schematic diagrames of the novel miniaturization wideband microband bandpass filter of the present invention；
Fig. 2 is the multimode resonator structural representation of the novel miniaturization wideband microband bandpass filter of the present invention；
Fig. 3 is the schematic diagram figure of the novel miniaturization wideband microband bandpass filter structures of the present invention；
Fig. 4 is the actual measurement profile figure of the novel miniaturization wideband microband bandpass filter of the present invention.
Embodiment
The preferred embodiments of the present invention are specifically described below in conjunction with the accompanying drawings, wherein, accompanying drawing constitutes the application part, and
It is used for the principle for explaining the present invention together with embodiments of the present invention.For purpose of clarity and simplification, when it may make the present invention
Theme it is smudgy when, illustrating in detail for known function and structure in device described herein will be omitted.
The invention provides a kind of novel miniaturization wideband microband bandpass filter, the present invention is based on microwave engineering application pair
The active demand of radio frequency microstrip circuit miniaturization, the filtering mode cascaded using three line coupled structures and multimode resonator structure,
So that wave filter design volume contrast Conventional parallel coupling microstrip filter design volume is greatly reduced, it influences the master of electrical property
Want physical parameter size bigger than normal, it is easy to adjust, be easy to engineer applied.Below in conjunction with accompanying drawing and several embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, do not limit
The present invention.
The embodiments of the invention provide a kind of novel miniaturization wideband microband bandpass filter, referring to Fig. 1 and 2, including：
Two symmetrical three lines coupled structures and a multimode resonator structure cascade；
The multimode resonator structural level is associated in two symmetrical three lines coupled structures.
Wherein, three line coupled structures described in the embodiment of the present invention and the multimode resonator structure use ROGERS5880 plates
Material, dielectric constant is 2.2, and thickness is 0.508mm, and the sheet material is externally provided with copper sheet, and the thickness of copper sheet is 0.018mm.And this hair
It is bright to carry out surface turmeric technique on the copper sheet surface.
When it is implemented, the present invention passes through the circuit model to the three lines coupled structure and the multimode resonator structure
Analyzed, the transfer function of its input/output port is calculated respectively, and calculate two group of three line coupled structure and multimode resonator
The transfer function of the structure of combination, the three line coupled structures and described according to sheet material parameter, centre frequency and bandwidth calculation
The physical parameter of multimode resonator structure, and three line coupled structures and multimode resonator structure link position parameter are calculated, pass through
One group of ground via microstrip structure completes the function of the horizontal microstrip line construction shorted to earth of bottom.
It should be noted that three line coupled structures include described in the embodiment of the present invention：Three groups of horizontal microstrip line constructions, one group
Longitudinal microstrip line construction and one group of ground via microstrip structure；
Wherein, in described three groups horizontal microstrip line constructions, from top to bottom, one group of the top be open-circuit structure, middle one group
It is short-circuit structure to connect the output port of subsequent structural, one group of bottom；Described one group longitudinal microstrip line construction completes connection three
The horizontal microstrip line construction of group, and it is used as signal input port.
With the requirement higher to volume and performance of existing rf signal analysis instrument, in order to not reduce module performance
In the case of reduce filter module volume be good trend, while in order to further optimize performance, to the steady of filter construction
Qualitative and adjustable proposes higher requirement.If coupling band logical microstrip filter design method using existing Conventional parallel to complete
The design of broadband filter is passed, it is coupled, and exponent number is more, and influence electrical property physical parameter (such as line width, line spacing) is minimum, is processed
Error influence is very big；The less physical parameters such as line width, line spacing can not be adjusted after processing, it is impossible to debug, engineer applied in addition
Effect extreme difference.
The present invention, which is provided in a kind of solution, design, has used two group of three line coupled structure and one group of multimode humorous
The mode of device structure of shaking cascade, couples filtered version relative to Conventional parallel, reduces the design volume of overall wave filter；Together
When, it influences the physical parameter size of the wave filter leading indicators such as centre frequency, bandwidth larger, it is easy to which the later stage adjusts.The present invention
Simultaneously for Practical Project demand, Parameters Optimal Design is carried out to the wave filter of 6 kinds of different frequency ranges, its design mainly includes
(1) three line coupled structure part
(2) multimode resonator structure division
Global design mainly considers wave filter capacity issue, i.e., determine first using the sheet materials of ROGERS 5880, it is led
It is dielectric constant 2.2 to want parameter, and thickness 0.508mm, copper sheet thickness 0.018mm, mentality of designing is as follows：To three line coupled structures and
The circuit model of multimode resonator structure is analyzed, and the transfer function of its input/output port is calculated respectively, and then calculate two
Group three line coupled structures and multimode resonator combination structure transfer function, further according to sheet material parameter, centre frequency with
And the index such as bandwidth calculates specific physical parameter, wave filter Preliminary design is completed.And then optimize fan-out, three lines coupling knot
Structure and multimode resonator structure link position and coupled structure inherent parameters, obtain final design parameter.
Three line coupled structure sizing specification figures of Fig. 1 this novel miniaturization wideband microband bandpass filters, which includes
Three groups of horizontal microstrip line constructions, one group of longitudinal microstrip line construction and one group of ground via microstrip structure.Three groups of horizontal microstrip lines
In structure, one group of the top is that open-circuit structure, middle one group of connection subsequent structural i.e. output port, one group of bottom are short-circuit knot
Structure.One group of longitudinal microstrip line construction completes the horizontal microstrip line construction of three groups of connection, and is used as signal input port.One group of ground connection
Via microstrip structure completes the function of the horizontal microstrip line construction shorted to earth of bottom.Wherein, rf_l is longitudinal microstrip line construction
Length；Rf_w is the width of longitudinal microstrip line construction；L1, l2, l3 are respectively top, middle, the horizontal microstrip line in three groups of lower section
The length of structure；W1 is the width of three groups of horizontal microstrip line constructions；G_l is the length of longitudinal ground via microstrip structure；G_w is
The width of ground via microstrip structure；R is ground via radius；S1 is top, the spacing of middle two groups of transverse directions microstrip line construction；
S2 is centre, the spacing of the horizontal microstrip line construction in two groups of lower section；A is the length that horizontal microstrip structure is connected out with longitudinal microstrip structure
Degree.
It should be noted that l3 becomes big in Fig. 1 of the present invention, low-frequency range degree of suppression can be increased, high band degree of suppression is reduced, from
And the Out-of-band rejection index of wave filter is adjusted, l2 diminishes with l1, can reduce band-pass behavior, improves Out-of-band rejection performance, so as to adjust
Return loss index in wave filter band is saved, s1 diminishes with s2, the wave filter degree of coupling can be reduced, band-pass behavior is deteriorated, so that so as to
Adjust return loss index in wave filter band.W1 changes, and can influence band inpolar, refer to so as to adjust return loss in wave filter band
Mark.
The multimode resonator physical dimension explanation figure of Fig. 2 this novel miniaturization wideband microband bandpass filters, that includes
Two asymmetric T-shaped open circuit minor matters are constituted.Each T-shaped open circuit minor matters include high resistant and low-resistance microstrip structure, wherein, x_ll
For the length of top low-resistance microstrip structure；X_wl is the width of top low-resistance microstrip structure；X_l2 is lower section low-resistance microstrip structure
Length；X_w2 is the width of lower section low-resistance microstrip structure；X_a1 is the length of top high resistant microstrip structure；X_a2 is that lower section is high
Hinder the length of microstrip structure；X_s is the width of two low-resistance microstrip structures.
It should be noted that x_w1 diminishes in Fig. 2 of the present invention, the high-end cut-off frequency of passband can be improved, so as to adjust filter
Ripple device bandwidth, x_w2 becomes big, can reduce the high-end cut-off frequency of passband, so as to adjust filter bandwidht, x_l1 diminishes, and can improve
The high-end cut-off frequency of passband, so as to adjust filter bandwidht.X_l2 becomes big, can reduce the high-end cut-off frequency of passband, so that
Adjust filter bandwidht.
The structural representation of Fig. 3 this novel miniaturization wideband microband bandpass filters, its agent structure is by two group of three line coupling
Close structure and one group of multimode resonator structure carries out cascade and completes the work of broadband bandpass filtering, sheet material uses RO5880 rf boards
Material, thickness is 0.508mm, copper sheet thickness 0.018mm, using surface turmeric technique, and 4-6GHz, 6- are distinguished in top from left to right
8GHz, 8-10GHz bandpass filter, lower section are respectively 10-12GHz, 12-16GHz, 16-20GHz bandpass filtering from left to right
Device, its physical parameter difference is as follows：
| Unit：mm | 4-6GHz | 6-8GHz | 8-10GHz | 10-12GHz | 12-16GHz | 16-20GHz |
| rf_l | 1.55 | 1.55 | 1.13 | 1.55 | 1.55 | 1.55 |
| rf_w | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| l1 | 11.3 | 7.8 | 4.95 | 4.65 | 3.75 | 3.15 |
| l2 | 11.3 | 7.85 | 4.9 | 4.8 | 3.75 | 2.95 |
| l3 | 11.05 | 7.65 | 4.2 | 4.55 | 3.6 | 2.8 |
| w1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| g_l | 0.65 | 0.65 | 0.65 | 0.6 | 0.65 | 0.55 |
| g_w | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 |
| r | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| s1 | 0.24 | 0.25 | 0.23 | 0.3 | 0.25 | 0.27 |
| s2 | 0.35 | 0.2 | 0.25 | 0.4 | 0.15 | 0.35 |
| a | 0.15 | 0.3 | 0.05 | 0.1 | 0.35 | 0.15 |
| x_ll | 4.5 | 4.1 | 3.1 | 3.4 | 1.9 | 2.3 |
| x_wl | 2.12 | 1.85 | 1.5 | 1.27 | 1.36 | 1 |
| x_l2 | 9.8 | 7.8 | 5 | 4.8 | 3.8 | 4.5 |
| x_w2 | 3.6 | 2.85 | 1.6 | 1.9 | 1.95 | 1.4 |
| x_a1 | 1.5 | 1 | 0.65 | 0.75 | 0.7 | 0.65 |
| x_a2 | 3 | 2 | 1.5 | 1.5 | 1.3 | 1.25 |
| x_s | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.8 |
In in the actual measurement profile figure of Fig. 4 this novel miniaturization wideband microband bandpass filters, main test bandwidth
Heart frequency, minimum frequency, the S21 parameters of three frequencies of highest frequency, i.e. insertion loss.Test center frequency point, minimum in bandwidth
The S11 parameters of frequency, three frequencies of highest frequency, i.e. return loss.The stopband suppression of the corresponding frequency of engineer applied is tested simultaneously
System.4-6GHz, 6-8GHz, 8-10GHz bandpass filter are distinguished in top from left to right, and lower section is respectively 10- from left to right
12GHz, 12-16GHz, 16-20GHz bandpass filter, wave filter electric property index are satisfied by engineer applied demand.
Active demand of the present invention based on microwave engineering application to radio frequency microstrip circuit miniaturization, utilizes three line coupled structures
The filtering mode cascaded with multimode resonator structure so that wave filter design volume contrast Conventional parallel coupling microstrip filter is set
Meter volume is greatly reduced, and it influences the main physical parameters size of electrical property bigger than normal, it is easy to adjusts, is easy to engineer applied.For
Practical engineering application demand, completes design guideline and the optimization of 6 groups of wave filters, ultimately form meet 6 groups of engineer applied it is micro-
Band filter product.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (5)
1. a kind of novel miniaturization wideband microband bandpass filter, it is characterised in that including：
Two symmetrical three lines coupled structures and a multimode resonator structure cascade；
The multimode resonator structural level is associated in two symmetrical three lines coupled structures.
2. wideband microband bandpass filter according to claim 1, it is characterised in that
The three lines coupled structure and the multimode resonator structure use the sheet materials of ROGERS 5880, and dielectric constant is 2.2, thick
Spend for 0.508mm, the sheet material is externally provided with copper sheet, and the thickness of copper sheet is 0.018mm.
3. wideband microband bandpass filter according to claim 2, it is characterised in that
The copper sheet surface uses surface turmeric technique.
4. wideband microband bandpass filter according to claim 1 or 2, it is characterised in that
The circuit model of the three lines coupled structure and the multimode resonator structure is analyzed, its input is calculated respectively defeated
The transfer function of exit port, and the transfer function of two group of three line coupled structure and the structure of multimode resonator combination is calculated, according to
The physical parameter of three line coupled structures and the multimode resonator structure described in sheet material parameter, centre frequency and bandwidth calculation,
And three line coupled structures and multimode resonator structure link position parameter are calculated, completed most by one group of ground via microstrip structure
The function of lower section transverse direction microstrip line construction shorted to earth.
5. wideband microband bandpass filter according to claim 1 or 2, it is characterised in that
The three lines coupled structure includes：Three groups of horizontal microstrip line constructions, one group of longitudinal microstrip line construction and one group were grounded
Hole microstrip structure；
In described three groups horizontal microstrip line constructions, from top to bottom, one group of the top is open-circuit structure, middle one group of connection is subsequently tied
The output port of structure, one group of bottom are short-circuit structure；
Described one group longitudinal microstrip line construction completes the horizontal microstrip line construction of three groups of connection, and is used as signal input port.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110729533A (en) * | 2019-09-30 | 2020-01-24 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Asymmetric SIR loaded wide stop band suppression broadband band-pass filter |
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