CN108493530A - A kind of novel limit is with adjustable ultra wide band bandpass filter - Google Patents
A kind of novel limit is with adjustable ultra wide band bandpass filter Download PDFInfo
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- CN108493530A CN108493530A CN201810212810.1A CN201810212810A CN108493530A CN 108493530 A CN108493530 A CN 108493530A CN 201810212810 A CN201810212810 A CN 201810212810A CN 108493530 A CN108493530 A CN 108493530A
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- 239000010410 layer Substances 0.000 claims abstract description 17
- 239000011229 interlayer Substances 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims description 23
- 230000008878 coupling Effects 0.000 claims description 21
- 238000010168 coupling process Methods 0.000 claims description 21
- 238000005859 coupling reaction Methods 0.000 claims description 21
- 239000000758 substrate Substances 0.000 claims description 16
- 238000000926 separation method Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000001629 suppression Effects 0.000 abstract description 4
- 230000007812 deficiency Effects 0.000 abstract description 3
- 238000005538 encapsulation Methods 0.000 abstract description 3
- 230000000670 limiting effect Effects 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/2039—Galvanic coupling between Input/Output
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a kind of novel limits with adjustable ultra wide band bandpass filter.The filter forms limit band using the intrinsic zero of multimode resonator in ultra wide band bandpass filter, Stepped Impedance resonance structure is combined with minor matters load resonance structure, form novel T-type multimode resonator, the shunt capacitance at the impedance transformation of Stepped Impedance resonance structure, increase mode of resonance number, and in resonator terminal loads varactor, it is adjusted using varactor and forms adjustable band limiting properties with interior dead-center position, it include mainly upper-layer micro-strip structure, interlayer plate and lower layer's grounded metal, with simple in structure, miniaturization, the features such as characteristic is good, the disadvantage of the filter selectivity deficiency designed based on multimode resonator can be overcome, realize good selectivity and harmonic suppression effect, and it is easily achieved circuit and integrates and system encapsulation.
Description
Technical field
The present invention relates to conditioned circuit theory field, especially a kind of novel limit is with adjustable ultra wide band bandpass filter.
Background technology
Since Federal Communications Commission (FCC) provided on 2 1st, 2002 ultra wide band (Ultra-wideband,
UWB) technology has pushed the product marketization process of Wideband/Ultra-Wideband technology in the application license in short-distance wireless communication field,
So that the research of Wideband/Ultra-Wideband system and its device has obtained more concerns.Ultrabroad band (3.1GHz-10.6GHz) covers
Lid range is very wide, with the range of other wireless services have it is overlapping (aeronautical radio navigation (ARNS) of such as 4.2-4.4GHz,
The radar frequency band of the wireless zone LAN wave band (WLAN) of 5.8GHz and the International Telecommunication Union of 8.5-10.68GHz
(ITU).These wireless service frequency ranges may interfere ultra-wideband signal, to cause distorted signals and sensitivity to decline.For
This frequency band is better used, using filter contains that these interference are essential.Solving the problems, such as this one has
The solution of effect is to realize the characteristic of a trap in the passband inside of ultrabroad band bandpass filter, precisely filter out and be not required to
The frequency range wanted.In recent years, many scholars are being dedicated to research limit with adjustable ultra wide band bandpass filter, such as 1 (Song of document
K,Xue Q.Inductance-Loaded Y-Shaped Resonators and Their Applications to
Filters[J].IEEE Transactions on Microwave Theory&Techniques,2010,58(4):978-
And (Xu J, Wu W, Kang W, the et al.Compact UWB Bandpass Filter With a of document 2 984)
Notched Band Using Radial Stub Loaded Resonator[J].IEEE Microwave and
Wireless Components Letters,2012,22(7):It all can than describing several limit bands in more detail in 351-353)
The structure of tunable filter, designed in the past limit band tunable filter structure there are the shortcomings that have：(1) bandwidth adjustment range is limited；
(2) in adjustment process, performance of filter is unstable；(3) varactor introduces parasitic parameter, causes unnecessary resonance, electricity
Source increases circuit volume.
Invention content
The purpose of the present invention is to provide a kind of novel limits with adjustable ultra wide band bandpass filter, to realize good choosing
Selecting property and harmonic suppression effect, and be easily achieved circuit and integrate and system encapsulation.
Realize that the technical solution of the object of the invention is：A kind of novel limit with adjustable ultra wide band bandpass filter, including
Upper-layer micro-strip structure, interlayer plate and lower layer's grounded metal；Upper-layer micro-strip structure is attached to interlayer substrate upper table
Face, grounded metal are attached to the lower surface of interlayer substrate；The restructural first port and second port are located at medium
The upper layer of substrate, the first port are located at medium substrate side, and the second port is located at the other side of medium substrate；Two
The microstrip line that 50 ohm of item is connected with corresponding two ports respectively, this two 50 ohm microstrip line is respectively the first microstrip line
With the second microstrip line, two microstrip lines are mutually parallel.
First port is connected by the first microstrip line with one end of the first parallel coupled line, first parallel coupled line
The other end is connected with the second parallel coupled line, and second port passes through the second microstrip line and the second parallel coupled line other end phase
Even；The junction of first parallel coupled line and the second parallel coupled line is connected by third microstrip line with the 4th microstrip line；First
Capacitance is connected on one end that the 4th microstrip line is connected with third microstrip line, first capacitance other end ground connection；Second capacitance is connected on the 4th
One end that microstrip line is connected with third microstrip line, first capacitance other end ground connection；It is separate that first varactor is connected on the 4th microstrip line
One end of third microstrip line.First capacitance is embedded in the first microstrip line, and the second capacitance is embedded in the second microstrip line.
First microstrip line, the second microstrip line, the first parallel coupled line, the second parallel coupled line, third microstrip line and
The value range of the width of 4th microstrip line is 0.15~15mm；First parallel coupled line and the second parallel coupled line
It is 0.15~0.6mm to couple spacing value range.
First microstrip line and the second microstrip line length l having the same1With width w1。
First parallel coupled line and the second parallel coupled line coupling separation delta l having the same, and the first parallel coupling
Zygonema and the second parallel coupled line length l having the same2With width w2。
The length l of first parallel coupled line and the second parallel coupled line2For the tunable filter center frequency wavelength
A quarter；The width w of first parallel coupled line and the second parallel coupled line2For 0.41mm；The third transmission line
Width w3For 4.48mm；The width w of 4th transmission line4For 0.84mm；First parallel coupled line and the second parallel coupling
The coupling separation delta l of zygonema is 0.15mm.
First capacitance, the capacitance of the second capacitance are identical, and value range is 20pF~150pF；Institute
It is identical to state the first capacitance, the capacitance of the second capacitance, and value range is 0.5pF~1pF.
The dielectric constant value range of the interlayer plate is 2~16, and the height value range of medium substrate is 0.1
~4mm.
Compared with prior art, the present invention has the following advantages：1) it is not necessarily to be limited with additional resonator is introduced, with passband
Amount of bandwidth is independent, keeps the constancy of pass band width, to simplify ultra wide band bandpass filter structure, realizes miniaturization；2)
The introducing of a pair of of a quarter parallel coupling transmission line is introducing two transmission zero as the feeding line portion success of filter with outer
Point is improved the disadvantage of the filter selectivity deficiency designed based on multimode resonator, realizes good selectivity and harmonic wave suppression
The effect of system.
Present invention is further described in detail below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 is schematic diagram of the present invention limit with adjustable ultra wide band bandpass filter.
Fig. 2 is to limit the equivalent circuit diagram with adjustable ultra wide band bandpass filter.
Fig. 3 is the transmission characteristic and return loss plot figure of the present invention.
Fig. 4 is the group delay frequency characteristic curve graph of the present invention.
Specific implementation mode
In conjunction with attached drawing, limited with adjustable ultra wide band bandpass filter, including upper-layer micro-strip structure the invention discloses a kind of,
Interlayer plate and lower layer's grounded metal；Upper-layer micro-strip structure is attached to interlayer upper surface of base plate, and grounded metal is attached
It in the lower surface of interlayer substrate；
The first port P1 and second port P2 of the filter are located at the upper layer of medium substrate, and the first port, which is located at, to be situated between
Matter substrate side, the second port are located at the other side of medium substrate；Two 50 ohm of microstrip line respectively with it is corresponding
Two ports are connected, this two 50 ohm microstrip line is respectively the first microstrip line 1 and the second microstrip line 2, two micro-strips
Line is mutually parallel；
First port P1 is connected by the first microstrip line 1 with one end of the first parallel coupled line 3, first parallel coupling
The other end of line 3 is connected with the second parallel coupled line 4, and second port P2 passes through the second microstrip line 2 and second parallel coupling
4 other end of line is connected；The junction of first parallel coupled line 3 and the second parallel coupled line 4 is micro- by third microstrip line 5 and the 4th
Band line 6 is connected；
First capacitance 9 is connected on one end that the 4th microstrip line 6 is connected with third microstrip line 5,9 other end of the first capacitance ground connection；
Second capacitance 10 is connected on one end that the 4th microstrip line 6 is connected with third microstrip line 5,10 other end of the second capacitance ground connection；First becomes
Hold pipe 11 and is connected on the 4th one end of microstrip line far from third microstrip line.First capacitance 7 is embedded in the first microstrip line 1, and second
Capacitance 8 is embedded in the second microstrip line 2.
Two 50 ohm of microstrip line has same length and width, the first parallel coupled line 3 and the second parallel coupling
4 coupling spacing having the same of line, 4 length and width having the same of the first parallel coupled line 3 and the second parallel coupled line.
First parallel coupled line 3, the length of the second parallel coupled line 4 are four points of the tunable filter center frequency wavelength
One of, first parallel coupled line 3, the second parallel coupled line 4, first transmission line 1, second transmission line 2, third transmission line 5,
The width of 4th transmission line 6 is 0.15-15mm, first parallel coupled line 3 and second parallel coupled line 4 coupling between
Away from being 0.15~0.6mm.
The width of first parallel coupled line 3, the second parallel coupled line 4 is 0.41mm, the third transmission line 5
Width is 4.48mm, the width of the 4th transmission line 6 is 0.84mm, first parallel coupled line 3, the 4th parallel coupled line 4
It is 0.15mm to couple spacing.
The identical capacitance of two capacitances is 20pF~150pF, first capacitance 9, the capacitance of the second capacitance 10
Identical is 0.5pF~1pF.
The dielectric constant of medium substrate is 2~16, and the height of medium substrate is 0.1~4mm.
Specifically, first microstrip line 1, the second microstrip line 2, the first parallel coupled line 3, the second parallel coupled line 4,
The value range of the width of third microstrip line 5 and the 4th microstrip line 6 is 0.15~15mm；First parallel coupled line, 3 He
The coupling spacing value range of second parallel coupled line 4 is 0.15~0.6mm.First microstrip line, 1 and second microstrip line 2
Length l having the same1With width w1.Between first parallel coupled line, 3 and second parallel coupled line, 4 coupling having the same
Away from Δ l, and 4 length l having the same of the first parallel coupled line 3 and the second parallel coupled line2With width w2.Described first is parallel
The length l of coupling line 3 and the second parallel coupled line 42For a quarter of the tunable filter center frequency wavelength；Described first
The width w of parallel coupled line 3 and the second parallel coupled line 42For 0.41mm；The width w of the third transmission line 53For 4.48mm；
The width w of 4th transmission line 64For 0.84mm；Between the coupling of first parallel coupled line, 3 and second parallel coupled line 4
It is 0.15mm away from Δ l.First capacitance 7, the capacitance of the second capacitance 8 are identical, and value range be 20pF~
150pF；First capacitance 9, the capacitance of the second capacitance 10 are identical, and value range is 0.5pF~1pF.The middle layer
The dielectric constant value range of dielectric-slab is 2~16, and the height value range of medium substrate is 0.1~4mm.
The present invention is not necessarily to be limited with additional resonator is introduced, and with pass band width size independence, keeps the perseverance of pass band width
It is qualitative, to simplify ultra wide band bandpass filter structure, realize miniaturization.
With reference to embodiment, the present invention is described in further detail.
Embodiment
The method that the present invention forms limit band using the intrinsic zero of multimode resonator in ultra wide band bandpass filter, will
Stepped Impedance structure is combined with minor matters loading structure, forms novel T-type multimode resonator, the impedance transformation of Stepped Impedance structure
Locate shunt capacitance, increases mode of resonance number, and in resonator terminal loads varactor, adjusted with interior zero position using varactor
It sets to form adjustable band limiting properties.The introducing of a pair of of a quarter parallel coupling transmission line exists as the feeding line portion success of filter
With two transmission zeros of outer introducing, improves the disadvantage of the filter selectivity deficiency designed based on multimode resonator, realize filter
The effect of the miniaturization of wave device and good selectivity and harmonics restraint.The size of entire medium substrate, 79.3mm*30mm*
The dielectric constant of 1mm, medium substrate are 2.2.The length of first transmission line 1 and second transmission line 2 is 17mm in Fig. 1, and width is
3.03mm, the first parallel coupled line 3, the second parallel coupled line 4 width be 0.41mm, coupling spacing be 0.15mm, length
It is 20.4mm, the width of third transmission line 5 is 4.48mm, and the width of length 26.6mm, the 4th transmission line 6 are 0.84mm,
Length is 13.4mm.The identical capacitance of two capacitances 1,2 is 100pF, first capacitance 9, the appearance of the second capacitance 10
It is 0.6pF to be worth identical, and that the first varactor 11 is selected is the SMV2019-079LF of Skyworks companies.
Fig. 1 is the schematic diagram of the limit with adjustable ultra wide band bandpass filter, and equivalent circuit is as shown in Figure 2, it is known that one end
The transmission line of loading capacitance and the TLM transmission line matrix of shunt capacitance are：
If the impedance entered in terms of from the B points of Fig. 2 to the minor matters of load is Zins,B, then
If the impedance entered in terms of from A points to the minor matters of load is Zins,A
So enabling the input impedance Z of minor mattersins,A=0, then it can acquire the resonance zero f of minor matterstz, the relational expression of satisfaction
For：
Fig. 3 is the tunable filter transfer curve, and Fig. 4 is the group delay frequency characteristic curve of the tunable filter.Limit band
Adjustable range be 2.32GHz to 3.00GHz (22%), while keeping 3-dB absolute bandwidths between 2.45GHz to 2.5GHz,
Relative bandwidth is 89.2% between 98%.Out-of-band harmonics inhibit to be more than 15dB, are less than 5ns with interior group delay.
The present invention has the characteristics that simple in structure, miniaturization, characteristic are good, can overcome the filter designed based on multimode resonator
The disadvantage that wave device selectivity is insufficient, realizes good selectivity and harmonic suppression effect, and is easily achieved that circuit is integrated and system
Encapsulation.
Claims (7)
1. a kind of novel limit is with adjustable ultra wide band bandpass filter, which is characterized in that including upper-layer micro-strip structure, interlayer
Plate and lower layer's grounded metal；The upper-layer micro-strip structure is attached to the upper surface of the interlayer plate, lower layer's ground connection
Metal is attached to the lower surface of the interlayer plate；
The first port (P1) and second port (P2) of filter are respectively positioned on the upper layer of the interlayer plate, the first end
Mouth (P1) is located at the side of dielectric-slab, and the second port (P2) is located at the other side of dielectric-slab；Two 50 ohm of microstrip line
It is connected respectively with corresponding two ports, this two 50 ohm microstrip line is respectively the first microstrip line (1) and the second microstrip line
(2), and two microstrip lines are mutually parallel；First port (P1) passes through the first microstrip line (1) and the one of the first parallel coupled line (3)
End is connected, and the other end of first parallel coupled line (3) is connected with one end of the second parallel coupled line (4), second port
(P2) it is connected with the other end of second parallel coupled line (4) by the second microstrip line (2)；First parallel coupled line (3) and
The junction of second parallel coupled line (4) is connected by third microstrip line (5) with the 4th microstrip line (6)；
One end of the first capacitance (9) is connected on the connecting place of the 4th microstrip line (6) and third microstrip line (5), the first capacitance (9) it is another
One end is grounded；One end of the second capacitance (10) is connected on the connecting place of the 4th microstrip line (6) and third microstrip line (5), the second capacitance
(10) other end ground connection；First varactor (11) is connected on one end far from third microstrip line on the 4th microstrip line；First blocking
Capacitance (7) is embedded in the first microstrip line (1), and the second capacitance (8) is embedded in the second microstrip line (2).
2. novel limit according to claim 1 is with adjustable ultra wide band bandpass filter, which is characterized in that first micro-strip
Line (1), the second microstrip line (2), the first parallel coupled line (3), the second parallel coupled line (4), third microstrip line (5) and the 4th are micro-
The value range of width with line (6) is 0.15~15mm；First parallel coupled line (3) and the second parallel coupled line
(4) coupling spacing value range is 0.15~0.6mm.
3. novel limit according to claim 1 is with adjustable ultra wide band bandpass filter, which is characterized in that first micro-strip
Line (1) and the second microstrip line (2) length l having the same1With width w1。
4. novel limit according to claim 1 is with adjustable ultra wide band bandpass filter, which is characterized in that described first is parallel
Coupling line (3) and the second parallel coupled line (4) coupling separation delta l having the same, and the first parallel coupled line (3) and second flat
Row coupling line (4) length l having the same2With width w2。
5. the novel limit according to claim 2,3 or 4 is with adjustable ultra wide band bandpass filter, which is characterized in that described
The length l of first parallel coupled line (3) and the second parallel coupled line (4)2It is four points of the tunable filter center frequency wavelength
One of；The width w of first parallel coupled line (3) and the second parallel coupled line (4)2For 0.41mm；The third transmission line
(5) width w3For 4.48mm；The width w of 4th transmission line (6)4For 0.84mm；First parallel coupled line (3) and
The coupling separation delta l of second parallel coupled line (4) is 0.15mm.
6. according to the novel limit described in claim 1 with adjustable ultra wide band bandpass filter, which is characterized in that described first every
Straight capacitance (7), the capacitance of the second capacitance (8) are identical, and value range is 20pF~150pF；First capacitance
(9), the capacitance of the second capacitance (10) is identical, and value range is 0.5pF~1pF.
7. according to the novel limit described in claim 1 with adjustable ultra wide band bandpass filter, which is characterized in that the middle layer
The dielectric constant value range of dielectric-slab is 2~16, and the height value range of medium substrate is 0.1~4mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810212810.1A CN108493530B (en) | 2018-03-15 | 2018-03-15 | A kind of novel limit is with adjustable ultra wide band bandpass filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810212810.1A CN108493530B (en) | 2018-03-15 | 2018-03-15 | A kind of novel limit is with adjustable ultra wide band bandpass filter |
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| CN108493530B CN108493530B (en) | 2019-07-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111092283A (en) * | 2020-01-03 | 2020-05-01 | 西安电子科技大学 | Ultra-wideband band-pass filter with adjustable trapped wave and application |
| CN113422182A (en) * | 2021-07-02 | 2021-09-21 | 杭州电子科技大学 | Adjustable low-pass filter based on impedance tuning |
| CN114499455A (en) * | 2022-01-17 | 2022-05-13 | 西南交通大学 | All-pass adjustable delay filter circuit |
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| CN104900950A (en) * | 2015-06-18 | 2015-09-09 | 西安电子科技大学 | Electrically tunable four-passband filter based on double layered resonator |
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2018
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| CN104900950A (en) * | 2015-06-18 | 2015-09-09 | 西安电子科技大学 | Electrically tunable four-passband filter based on double layered resonator |
| CN106257744A (en) * | 2016-07-27 | 2016-12-28 | 南京理工大学 | The BREATHABLE BANDWIDTH ultra wide band bandpass filter loaded based on parallel coupled line |
| CN106571507A (en) * | 2016-11-14 | 2017-04-19 | 南京理工大学 | Multifunctional reconfigurable filter based on principle of signal interference |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111092283A (en) * | 2020-01-03 | 2020-05-01 | 西安电子科技大学 | Ultra-wideband band-pass filter with adjustable trapped wave and application |
| CN111092283B (en) * | 2020-01-03 | 2021-04-06 | 西安电子科技大学 | Ultra-wideband band-pass filter with adjustable trapped wave and application |
| CN113422182A (en) * | 2021-07-02 | 2021-09-21 | 杭州电子科技大学 | Adjustable low-pass filter based on impedance tuning |
| CN113422182B (en) * | 2021-07-02 | 2022-04-01 | 杭州电子科技大学 | Adjustable low-pass filter based on impedance tuning |
| CN114499455A (en) * | 2022-01-17 | 2022-05-13 | 西南交通大学 | All-pass adjustable delay filter circuit |
| CN114499455B (en) * | 2022-01-17 | 2023-04-28 | 西南交通大学 | Full-general adjustable delay filter circuit |
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| CN108493530B (en) | 2019-07-16 |
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