CN207009614U - A kind of microwave band-pass filter with pairs of transmission line structure - Google Patents
A kind of microwave band-pass filter with pairs of transmission line structure Download PDFInfo
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- CN207009614U CN207009614U CN201620524093.2U CN201620524093U CN207009614U CN 207009614 U CN207009614 U CN 207009614U CN 201620524093 U CN201620524093 U CN 201620524093U CN 207009614 U CN207009614 U CN 207009614U
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- transmission line
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Abstract
The utility model discloses a kind of microwave band-pass filter with pairs of transmission line structure.Including dielectric-slab, a surface of dielectric-slab is provided with metal micro-strip, and another surface is with being provided with metal；Described metal micro-strip includes upper transmission line, and upper transmission line is connected with lower transmission line；Described upper transmission line includes micro-strip waveguide segment, micro-strip waveguide segment is connected artificial surface phasmon section with artificial surface phasmon section through changeover portion and is connected with coupled section, upper transmission line is identical with the structure of lower transmission line, and upper transmission line is connected with lower transmission line by coupled section；Rectangular recess is distributed with described artificial surface phasmon section；Described coupled section is provided with rectangular recess.The utility model has the characteristics of low transmission loss, avoid electromagnetic field strong reflection and anti-electromagnetic interference capability strong.
Description
Technical field
A kind of wave filter of communication field is the utility model is related to, particularly a kind of microwave with pairs of transmission line structure
Bandpass filter.
Background technology
In the current big data epoch, as the demand of information is in explosive growth, field of mobile communication requirement can manufacture
Go out the higher microwave device of integrated level, however as the continuous diminution of high-frequency integrated circuit size, technically occur a series of
Problem, such as certain degree is arrived when the size of microwave device is small, the electromagnetic interference noise of device, RC retardation ratio etc., which reaches capacity, to be led
Device job insecurity is caused, therefore existing microwave device has not adapted to the development of current extensive microwave integrated circuit.
Utility model content
The purpose of this utility model is, there is provided a kind of microwave band-pass filter with pairs of transmission line structure.This practicality
It is new that there is the characteristics of low transmission loss, avoid electromagnetic field strong reflection and anti-electromagnetic interference capability strong.
The technical solution of the utility model：A kind of microwave band-pass filter with pairs of transmission line structure, including dielectric-slab,
One surface of dielectric-slab is provided with metal micro-strip, and another surface is with being provided with metal；Described metal micro-strip includes uploading
Defeated line is connected with lower transmission line；Described upper transmission line includes micro-strip waveguide segment, and micro-strip waveguide segment is through changeover portion and artificial surface
Phasmon section is connected, and artificial surface phasmon section is connected with coupled section, and upper transmission line is identical with the structure of lower transmission line, on
Transmission line is connected with lower transmission line by coupled section；Rectangular recess is distributed with described artificial surface phasmon section；Institute
The coupled section stated is provided with rectangular recess.
In the foregoing microwave band-pass filter with pairs of transmission line structure, the width of rebate w1's of described rectangular recess
Value is 0.5~2mm, and the depth w2 of rectangular recess value is 0.5~2mm, between the intersegmental coupling of the coupling of upper and lower transmission line
Gap d value is 0.05~0.5mm, and the grooved cycle p of rectangular recess is 3~8mm；The length l of described coupled section4Value
For 1~10mm.
In the foregoing microwave band-pass filter with pairs of transmission line structure, the lower edges on described metal ground are ellipse
Circular curve, elliptic curve meetThe curve of elliptic equation；Wherein a is oval bent
Line minor axis radius, its value are 0.1~7.5；H is metal micro-strip width, and its value is 0.8~3.0mm；W is elliptic curve position
Coefficient is put, its value is 3~8mm；l1For the length of micro-strip waveguide segment, its value is 3~8mm, l2For transition section length, it takes
It is worth for 20~40mm, l3For the length of artificial surface phasmon section, its value is 10~25mm；The width of described dielectric-slab
wsubValue is 10~20mm.
In the foregoing microwave band-pass filter with pairs of transmission line structure, described changeover portion is provided with depth gradual change
Rectangular recess.
Compared with prior art, the utility model in micro-strip waveguide segment (below with its length symbol l1Substitute) and labor statement
Face phasmon section is (below with its length symbol l3Substitute) between set changeover portion (below with its length symbol l2Substitute), and
l2The back side sets metal, metal lower edges to meetElliptic equation
Curve, by the structure, electromagnetic field is realized in l1And l3The smooth transition of middle propagation, is substantially reduced because of electromagnetic field mode and resistance
There is strong microwave electric field reflection in anti-mismatch, avoids output end electromagnetic field and deep fades occurs, effectively reduces electromagnetism
The transmission loss of field；Applicant had found by many experiments, when in the curve of elliptic equation a be 0.1~7.5, h be 0.8~
3.0mm, w are 3~8mm, l1For 3~8mm, l2For 20~40mm, l3For 10~25mm when, the reflection of its microwave electric field is minimum；No
Only in this way, the utility model is in l2On be additionally provided with the rectangular recess of depth gradual change；By the structure, quasi- TEM can be further realized
Transition of the pattern to SSPPs patterns, reduce microwave electric field reflection.Upper and lower transmission line of the present utility model passes through recessed provided with rectangle
The coupled section of slot structure is connected；The coupled structure, by another biography of electromagnetic energy feed-in of a transmission line (upper transmission line)
Defeated line (lower transmission line), so cause the coupled structure on wave filter stopband introduce a transmission zero so that wave filter into
For bandpass filter.And the transmission zero can be regulated and controled by the size of coupled structure, so as to realize the passband to wave filter
The regulation and control of bandwidth and the Out-of-band rejection characteristic of upper stopband.Applicant is drawn by many experiments, as the length l of coupled section4For 1~
When 10mm, coupling gap d are 0.05~0.5mm, coupled structure is special to the pass band width of wave filter and the Out-of-band rejection of upper stopband
The regulating effect of property is best.
The utility model passes through in l3It is upper that a series of rectangular recess is set；Pass through the structure so that electromagnetic field is transmitting
When be bound in around rectangular recess, so as to greatly reduce plurality of transmission lines transmission when because spacing electromagnetism that is too small and occurring is done
Disturb so that antijamming capability greatly enhances, while also enhances stability when high density microwave integrated circuit works, not only such as
This, because anti-electromagnetic interference capability greatly enhances, the utility model can also reduce the spacing between the metal micro-strip of microwave integrated circuit
To realize the miniaturization of device, thus the development of current extensive microwave integrated circuit can be better adapted to.The utility model is also
The cut-off frequency of microwave transmission line and magnetic distribution can be regulated and controled by adjusting the physical dimension of rectangular recess, while adjust electricity
The constraint effect of magnetic wave, applicant have found after lot of experiments is carried out, when w1 is 0.5~2mm, w2 is 0.5~2mm, p be 3~
During 8mm, rectangular recess has constraint effect well to electromagnetic field.
In order to preferably prove the beneficial effects of the utility model, application has carried out following experiment：Applicant designs one
Microwave band-pass filter sample with pairs of transmission line structure, the parameter such as table 1 of sample.
The microwave filter sample each several part parameter (unit of table 1：mm)
The dielectric-slab of the sample uses dielectric constant to have for 2.65 substrate to the filtering curve of the sample through time domain
Difference Calculation is limited as shown in figure 3, S11 is filter reflection coefficients in Fig. 3, S21 is filter transfer coefficient, and the sample is band logical
Filtering, its centre frequency is 24.261GHz, and insertion loss is -1.1dB at this, and its -3dB passband arrives for 21.275GHz
27.246GHz, sample are less than 7.7dB in whole passband reflection coefficient, and ripple shake is less than 0.8dB.
Design one is free of changeover portion l2Contrast wave filter, the dielectric constant of its dielectric-slab is all 2.65, other structures
Parameter is with reference to table 1；The coverage diagram of the contrast wave filter is calculated through Fdtd Method, result of calculation is as shown in Figure 4.
Learnt by Fig. 4, filter transfer loss is big compared with the sample for having changeover portion, and passband reflection coefficient substantially exceeds -10dB.
Contrasted from Fig. 3 and Fig. 4, set the changeover portion of the rectangular recess of depth gradual change to can effectively improve transmission and the reflection spy of sample
Property.
Fig. 5 be sample in 24GHz band operations, the distribution map of the electric field of normal direction around rectangular recess, as seen from the figure,
Its electric field is mainly bound by around rectangular recess, spreads very little.
Fig. 6 shows the coupling spacing of two SSPPs transmission lines to stopband attenuation pole location on wave filter S21 curves
Regulating and controlling effect.By setting the different spacing between two transmission lines to introduce decay pole by the diverse location of stopband on S21 curves
Point, so as to regulate and control the Out-of-band rejection characteristic of the pass band width of wave filter and upper stopband.
Brief description of the drawings
Fig. 1 is positive structure schematic of the present utility model；
Fig. 2 is structure schematic diagram of the present utility model；
Fig. 3 is the S parameter curve map of sample；
Fig. 4 is the S parameter curve map for the wave filter for not using changeover portion；
Fig. 5 is rectangular recess surrounding normal direction distribution map of the electric field of the wave filter sample in 24GHz band operations.
Fig. 6 is regulation and control figure of the coupling gap to stopband attenuation pole location on wave filter S21 curves.
Mark in accompanying drawing for：1- dielectric-slabs, the upper transmission lines of 2-, 3- metals, 4- micro-strip waveguide segments, 5- changeover portions, 6-
Artificial surface phasmon section, 7- rectangular recess, 8- elliptic curves, transmission line under 9-, 10- coupled sections.
Embodiment
The utility model is further described with reference to the accompanying drawings and examples, but is not intended as to the utility model
The foundation of limitation.
Embodiment.A kind of microwave band-pass filter with pairs of transmission line structure, form as illustrated in fig. 1 and 2, including medium
Plate 1, a surface of dielectric-slab 1 are provided with metal micro-strip, another surface with being provided with metal 3；Described metal micro-strip bag
Transmission line 2 is included to be connected with lower transmission line 9；Described upper transmission line 2 includes micro-strip waveguide segment 4, and micro-strip waveguide segment 4 is through changeover portion
5 are connected with artificial surface phasmon section 6, and artificial surface phasmon section 6 is connected with coupled section 10, and upper transmission line 2 passes with
The structure of defeated line 9 is identical, and upper transmission line 2 is connected with lower transmission line 9 by coupled section 10；Described artificial surface phasmon
Rectangular recess 7 is distributed with section 6；Described coupled section 10 is provided with rectangular recess 7.
The width of rebate w1 of foregoing rectangular recess 7 value is 0.5~2mm, and the depth w2 of rectangular recess 7 value is
0.5~2mm, the coupling gap d between the coupled section 10 of upper and lower transmission line value are 0.05~0.5mm, the groove of rectangular recess 7
Type period p is 3~8mm；The length l of described coupled section 104Value be 1~10mm.
Foregoing metal 3 lower edges be elliptic curve 8, elliptic curve 8 meetsThe curve of elliptic equation；Wherein a is the minor axis radius of elliptic curve 8, its value
For 0.1~7.5；H is metal micro-strip width, and its value is 0.8~3.0mm；W is the position parameter of elliptic curve 8, and its value is 3
~8mm；l1For the length of micro-strip waveguide segment, its value is 3~8mm, l2For transition section length, its value is 20~40mm, l3For
The length of artificial surface phasmon section 6, its value are 10~25mm；The width w of described dielectric-slab 1subValue be 10~
20mm。
Foregoing changeover portion 5 is provided with the rectangular recess 7 of depth gradual change.
Operation principle of the present utility model：The electromagnetic field of Quasi-TEM mode is transferred to changeover portion by the micro-strip waveguide segment 4 on the left side
5, gradually fade to the electromagnetic field of SSPPs patterns in changeover portion 5, and Quasi-TEM mode and SSPPs patterns in changeover portion 5
Electromagnetic field coexists, and when electromagnetic field reaches artificial surface phasmon section 6, is fully converted to the electromagnetic fields of SSPPs patterns, and
l3It is transmitted, SSPPs patterns electromagnetic field passes through coupled section 10 by transmission line 9 under energy of electromagnetic field feed-in via it again after transmission
Transmission.When electromagnetic field is propagated in micro-strip waveguide segment 4, the pattern of electromagnetic field is Quasi-TEM mode in this section, and the pattern electromagnetic field is by beam
With being tied to micro-strip waveguide segment 4 and metal in the dielectric-slab between 3；When changeover portion 5 is propagated, Quasi-TEM mode and SSPPs moulds in the section
Formula coexists, and wherein Quasi-TEM mode electromagnetic field is with being bound in changeover portion 5 and metal in the dielectric-slab between 3, SSPPs pattern electromagnetism
Field is bound in around rectangular recess；In l3It is SSPPs patterns in the section, the pattern electromagnetic field is bound in when being propagated
Around rectangular recess.
Claims (3)
- A kind of 1. microwave band-pass filter with pairs of transmission line structure, it is characterised in that：Including dielectric-slab（1）, dielectric-slab（1） A surface be provided with metal micro-strip, another surface is with being provided with metal（3）；Described metal micro-strip includes upper transmission line （2）, upper transmission line（2）With lower transmission line（9）Connection；Described upper transmission line（2）Including micro-strip waveguide segment（4）, micro-strip waveguide Section（4）Through changeover portion（5）With artificial surface phasmon section（6）Connection, artificial surface phasmon section（6）With coupled section（10） Connection, upper transmission line（2）With lower transmission line（9）Structure it is identical, upper transmission line（2）With lower transmission line（9）Pass through coupled section （10）It is connected；Described artificial surface phasmon section（6）Rectangular recess is inside distributed with（7）；Described coupled section（10）On Provided with rectangular recess（7）；Described rectangular recess（7）Width of rebate w1 value be 0.5~2mm, rectangular recess（7）Depth Degree w2 value is 0.5~2mm, the coupled section of upper and lower transmission line（10）Between coupling gap d value be 0.05~0.5mm, Rectangular recess（7）Grooved cycle p be 3~8mm；Described coupled section（10）Length l4Value be 1~10mm.
- 2. the microwave band-pass filter according to claim 1 with pairs of transmission line structure, it is characterised in that：Described gold Possession（3）Lower edges be elliptic curve（8）, elliptic curve（8）Meet The curve of elliptic equation；Wherein a is elliptic curve（8）Minor axis radius, its value are 0.1~7.5；H is metal micro-strip width, its Value is 0.8~3.0mm；W is elliptic curve（8）Position parameter, its value are 3~8mm；l1For the length of micro-strip waveguide segment, Its value is 3~8mm, l2For transition section length, its value is 20~40mm, l3For artificial surface phasmon section（6）Length Degree, its value is 10~25mm；Described dielectric-slab（1）Width wsubValue is 10~20mm.
- 3. the microwave band-pass filter according to claim 1 or 2 with pairs of transmission line structure, it is characterised in that：It is described Changeover portion（5）It is provided with the rectangular recess of depth gradual change（7）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620524093.2U CN207009614U (en) | 2016-06-01 | 2016-06-01 | A kind of microwave band-pass filter with pairs of transmission line structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620524093.2U CN207009614U (en) | 2016-06-01 | 2016-06-01 | A kind of microwave band-pass filter with pairs of transmission line structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207009614U true CN207009614U (en) | 2018-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620524093.2U Withdrawn - After Issue CN207009614U (en) | 2016-06-01 | 2016-06-01 | A kind of microwave band-pass filter with pairs of transmission line structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207009614U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932376A (en) * | 2016-06-01 | 2016-09-07 | 六盘水师范学院 | Microwave band-pass filter with double transmission line structure |
-
2016
- 2016-06-01 CN CN201620524093.2U patent/CN207009614U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932376A (en) * | 2016-06-01 | 2016-09-07 | 六盘水师范学院 | Microwave band-pass filter with double transmission line structure |
| CN105932376B (en) * | 2016-06-01 | 2019-03-19 | 六盘水师范学院 | A kind of microwave band-pass filter with pairs of transmission line structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180213 Effective date of abandoning: 20190319 |
|
| AV01 | Patent right actively abandoned |