CN104362415B - A kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture - Google Patents
A kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture Download PDFInfo
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Abstract
The present invention relates to a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture, this wave filter includes dielectric-slab, front portion, reverse side part, conduction band, earth plate, input port and output port, conduction band is horizontally installed on the front of dielectric-slab, the two ends of conduction band are connected with input port and output port respectively, and earth plate is arranged on dielectric-slab reverse side；Front portion includes being arranged on the first complementary type rectangular aperture defected microstrip structure above dielectric-slab, the second complementary type rectangular aperture defected microstrip structure, the 3rd complementary type rectangular aperture defected microstrip structure and the 4th complementary type rectangular aperture defected microstrip structure, each complementary type rectangular aperture defected microstrip structure is made up of the contrary ring-like gap in ring-like gap, inner side and outside of two opening directions, and the ring-like gap in ring-like gap, inner side and outside is formed by conduction band etching with one heart.The present invention reduces the area of whole device, and wide stopband can be obtained by the working frequency points reasonably adjusting defect sturcture.
Description
Technical field
The invention belongs to technical field of micro communication, particularly relate to a kind of miniaturization width resistance based on biplane defect sturcture
Low-pass filter, can be used for suppressing the harmonic wave in wireless communication system and noise jamming signal.
Background technology
Low pass filter is often used in harmonic wave and parasitic disturbances signal in suppression wireless communication system.At many microwaves
In application, urgent demand is had to the low pass filter of compact size and Wide stop bands.Miniaturization is that the important of electronic equipment is wanted
Ask, especially for handheld wireless device, when utilizing monolithic integrated optical circuit, amplifier, frequency mixer and modulator etc. are integrated into
After reaching the reduction of circuit volume on chip piece, it is necessary to realize that the size of wave filter reduces.Wide stop bands can be at big frequency
Suppression interference signal in the range of rate, if using multiple cascode device to reach identical interference signal suppression, can cause equipment
The increase of size and the rising of cost.
Defect ground structure (Defected Ground Structure, DGS) is to lose on the earth plate of planar transmission line
Carving the defect pattern of definite shape, the advantage of its maximum is to have significant stopband and Slow-wave effect characteristic, and this is owing to connecing
Defect on floor disturbs CURRENT DISTRIBUTION, result in the change of transmission line equivalent inductance and electric capacity.Owing to each DGS unit can
To produce a transmission zero, wide stopband can be realized by cascading multiple DGS unit of different length.The shape of DGS exists
It is largely fixed the frequency response of device, to this end, people develop the DGS unit of various shape in succession, such as complementary type
Split ring, fractal structure etc..For the Stopband Performance obtaining, generally require a lot of construction units of cascade, can cause therewith
The increase of physical size and the deterioration of band-pass behavior.
As the extension of defect ground structure, the defected microstrip structure developing in recent years (Defected Microstrip
Structure, DMS) it is on micro-strip conduction band, etch uniform or non-homogeneous slit, there is significant stopband and slow equally
Wave effect, and there is less electromagnetic interference surface noise, the new free degree can be provided for the realization of high performance device.Profit
There is provided good means by biplanar defect sturcture layout by the reduction for device size.Through the literary composition to prior art
Offer retrieval discovery, utilize biplane defect to realize that the report of high performance mini device is less.For example, in March, 2012 Zhu
Haoran et al. at IEEE Antennas and Wireless Propagation Letters, 11 curly hair tables "
Miniaturized Tapered EBG Structure with Wide Stopband and Flat Passband(has
The miniaturization gradual change EBG structure of Wide stop bands and flat passband) ", the paper proposes and utilize the EBG structure of biplane gradual change to come in fact
Existing Wide stop bands and smooth passband, and introduce extra crestal line and open circuit minor matters increase bandwidth of rejection further, but
There is wider bandwidth of rejection and the low pass filter of more compact size remains a need for studying further.
Content of the invention
Realizing present in technology not enough for low pass filter is existing, the present invention proposes a kind of based on biplane defect
The Miniature wide stop-band low-pass filter of structure, with the problem such as solve that existing low pass filter size is relatively big and stopband is narrower.
A kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture, this wave filter includes dielectric-slab, just
Face part, reverse side part, conduction band, earth plate, input port and output port, described conduction band is just being horizontally installed on dielectric-slab
Face, the two ends of conduction band are connected with described input port and output port respectively, and it is anti-that described earth plate is arranged on dielectric-slab
Face；Described front portion includes being arranged on the first complementary type rectangular aperture defected microstrip structure above dielectric-slab, second mutual
Apotype rectangular aperture defected microstrip structure, the 3rd complementary type rectangular aperture defected microstrip structure and the 4th complementary type rectangular aperture lack
Fall into microstrip structure, four complementary type rectangular aperture defected microstrip structure transversely setting gradually at conduction band, each complementary type square
Shape flaws microstrip structure is made up of ring-like gap, the contrary inner side of opening direction and ring-like gap, outside, ring-like gap, inner side
Ring-like gap is formed by conduction band etching with one heart with outside；Described reverse side part include the one or four U-shaped defect ground structure, second
Four U-shaped defect ground structures, the three or four U-shaped defect ground structure and the four or four U-shaped defect ground structure, four four U-shaped defect ground structures
Transversely setting gradually at earth plate, each four U-shaped defect ground structure is entrenched togather by four U-shaped gaps and constitutes, and four U-shaped
Gap is formed by earth plate etching, the terminal alignment in four U-shaped gaps.
As preferably, described the first complementary type rectangular aperture defected microstrip structure, the second complementary type rectangular aperture defect
Microstrip structure, the 3rd complementary type rectangular aperture defected microstrip structure and the 4th complementary type rectangular aperture defected microstrip structure division ring type
Beyond the length in gap is unequal, other sizes are all identical.
As most preferably, the width in the ring-like gap in ring-like gap, described inner side and outside is respectively 2.4mm and 3.6mm,
The a length of 0.6mm of opening, the spacing of inside and outside side ring groove part gap is 0.3mm.
As most preferably, the length in ring-like gap, described outside be respectively 16.0mm, 14.6mm, 13.3mm and
12.1mm, the first complementary type rectangular aperture defected microstrip structure, the second complementary type rectangular aperture defected microstrip structure, the 3rd complementation
Spacing between type rectangular aperture defected microstrip structure and the 4th complementary type rectangular aperture defected microstrip structure is 3.5mm.
As preferably, described the one or four U-shaped defect ground structure, the two or four U-shaped defect ground structure, the three or four U-shaped defect
The width in the U-shaped gap of ground structure and the four or four U-shaped defect ground structure is identical, and from outside to inner side, each U-shaped gap is horizontal
Length is different with longitudinal length.As most preferably, described the one or four U-shaped defect ground structure, the two or four U-shaped defect ground structure,
The width in the U-shaped gap of the three or four U-shaped defect ground structure and the four or four U-shaped defect ground structure is 0.3mm.
As most preferably, from outside to inner side: the longitudinal length in the one or four each U-shaped gap of U-shaped defect ground structure is successively
For 12.8mm, 10.6mm, 6.5mm and 4.8mm, lateral length is followed successively by 12.1mm, 10.7mm, 7.6mm and 5.9mm；Two or four U
The longitudinal length in each U-shaped gap of type defect ground structure is followed successively by 12.8mm, 10.0mm, 6.5mm and 4.8mm, and lateral length depends on
Secondary for 11.6mm, 9.8mm, 6.8mm and 5.5mm；The width in the three or four each U-shaped gap of U-shaped defect ground structure is followed successively by
12.8mm, 10.0mm, 6.5mm and 4.8mm, lateral length is followed successively by 10.6mm, 8.6mm, 6.0mm and 5.1mm；Four or four is U-shaped
The longitudinal length of defect ground structure is followed successively by 12.8mm, 10.0mm, 6.5mm and 4.8mm, lateral length be followed successively by 10.3mm,
7.0mm, 5.5mm and 4.8mm.
As preferably, described the one or four U-shaped defect ground structure, the two or four U-shaped defect ground structure, the three or four U-shaped defect
Ground structure and the four or four U-shaped defect ground structure each between spacing different.
As most preferably, described the one or four U-shaped defect ground structure, the two or four U-shaped defect ground structure, the three or four U-shaped lack
Fall into ground structure and the four or four U-shaped defect ground structure each between spacing be followed successively by 7.4mm, 6.5mm and 6.2mm.
As preferably, described input port and output port are separately positioned on the side at dielectric-slab two ends.
Miniature wide stop-band low-pass filter based on biplane defect sturcture of the present invention, first, second,
Three and the 4th transmission zero is produced by four complementary type rectangular aperture defected microstrip structures to ensure passband to the precipitous mistake of stopband
Cross and the low-loss in passband, and each four U-shaped defect ground structure can provide four separately adjustable fundamental resonance points.With
When the transmission zero that produced by utilizing four U-shaped defect ground structures of the present invention realize wide stopband, and by utilizing biplane
Layout and the Slow-wave effect of defect sturcture to meet the demand of device miniaturization.
The Miniature wide stop-band low-pass filter that the present invention proposes, takes full advantage of micro-strip conduction band and connects the sky of earth plate
Between, can greatly reduce the area of whole device by using biplanar layout, and by reasonably adjusting defect sturcture
Working frequency points can obtain wide stopband.Meanwhile, the first eight transmission zero of this wave filter can independently control, thus very big
Time needed for simulation optimization in reduction device design process.
Brief description
Fig. 1 is the general structure signal of the Miniature wide stop-band low-pass filter based on biplane defect sturcture for the present invention
Figure.
Fig. 2 is the Facad structure signal of the Miniature wide stop-band low-pass filter based on biplane defect sturcture for the present invention
Figure.
Fig. 3 is the inverse layer structure signal of the Miniature wide stop-band low-pass filter based on biplane defect sturcture for the present invention
Figure.
Fig. 4 is the frequency response knot based on the Miniature wide stop-band low-pass filter emulation of biplane defect sturcture for the present invention
Really.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is made a detailed explanation.
A kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture as shown in Figure 1, this wave filter bag
Include dielectric-slab the 1st, front portion the 2nd, reverse side part the 3rd, conduction band the 4th, earth plate the 16th, input port 5 and output port 6, described conduction band 4
Being horizontally installed on the front of dielectric-slab 1, the two ends of conduction band 4 are connected with described input port 5 and output port 6 respectively, institute
The earth plate 16 stated is arranged on dielectric-slab 1 reverse side；Described input port 5 and output port 6 are separately positioned on dielectric-slab 1 two ends
Side.Above-mentioned dielectric-slab 1 dielectric constant is 2.55, and thickness is 1.5 mm, and the width of conduction band 4 is that 4.5 mm are to obtain 50
The characteristic impedance of Ω.
As in figure 2 it is shown, described front portion 2 includes that the first complementary type rectangular aperture being arranged on above dielectric-slab 1 lacks
Fall into microstrip structure the 7th, the second complementary type rectangular aperture defected microstrip structure the 8th, the 3rd complementary type rectangular aperture defected microstrip structure 9 and
4th complementary type rectangular aperture defected microstrip structure 10, horizontal at conduction band 4 of four complementary type rectangular aperture defected microstrip structures
On set gradually, each complementary type rectangular aperture defected microstrip structure is by ring-like gap 22, the contrary inner side of opening direction and outside
Ring-like gap 21 is constituted, and the ring-like gap in ring-like gap, inner side 22 and outside 21 is concentric to be formed by conduction band 4 etching.Described first
Complementary type rectangular aperture defected microstrip structure the 7th, the second complementary type rectangular aperture defected microstrip structure the 8th, the 3rd complementary type rectangle is opened
Beyond the length of mouthful defected microstrip structure 9 and the 4th complementary type rectangular aperture defected microstrip structure 10 division ring groove part gap is unequal,
Other sizes are all identical.The ring-like gap in ring-like gap, inner side 22 and outside 21 of each complementary type rectangular aperture defected microstrip structure
Width be respectively 2.4mm and 3.6mm, a length of 0.6mm of opening 23, the spacing of inside and outside side ring groove part gap is 0.3mm；Four
The length in ring-like gap, individual outside 21 is respectively 16.0mm, 14.6mm, 13.3mm and 12.1mm.First complementary type rectangular aperture lacks
Fall into microstrip structure the 7th, the second complementary type rectangular aperture defected microstrip structure the 8th, the 3rd complementary type rectangular aperture defected microstrip structure 9 and
Spacing between 4th complementary type rectangular aperture defected microstrip structure 10 is 3.5mm.
As it is shown on figure 3, described reverse side part 3 includes that the 11st, the one or four U-shaped defect ground structure is tied to the two or four U-shaped defect
Structure the 12nd, the three or the four U-shaped defect ground structure 14 of U-shaped defect ground structure the 13 and the 4th 4, four four U-shaped defect ground structures are at earth plate
16 transversely set gradually, and each four U-shaped defect ground structure is entrenched togather by four U-shaped gaps 15 and constitutes, four U-shaped gaps
15 are formed by earth plate 16 etching, the terminal alignment in four U-shaped gaps 15.The one or four described U-shaped defect ground structure the 11st,
The U-shaped gap 15 of two or four U-shaped defect ground structures the 12nd, the three or the four U-shaped defect ground structure 14 of U-shaped defect ground structure the 13 and the 4th 4
Width is identical, and from outside to inner side, the lateral length in each U-shaped gap 15 is different with longitudinal length.Four U-shaped defect ground structures
The width in U-shaped gap 15 be 0.3mm.From outside to inner side: the one or four each U-shaped gap 15 of U-shaped defect ground structure 11
Longitudinal length is followed successively by 12.8mm, 10.6mm, 6.5mm and 4.8mm, lateral length be followed successively by 12.1mm, 10.7mm, 7.6mm and
5.9mm；The longitudinal length in the two or four each U-shaped gap 15 of U-shaped defect ground structure 12 be followed successively by 12.8mm, 10.0mm, 6.5mm and
4.8mm, lateral length is followed successively by 11.6mm, 9.8mm, 6.8mm and 5.5mm；Three or four each U-shaped seam of U-shaped defect ground structure 13
The width of gap 15 is followed successively by 12.8mm, 10.0mm, 6.5mm and 4.8mm, lateral length be followed successively by 10.6mm, 8.6mm, 6.0mm and
5.1mm；The longitudinal length of the four or four U-shaped defect ground structure 14 is followed successively by 12.8mm, 10.0mm, 6.5mm and 4.8mm, laterally long
Degree is followed successively by 10.3mm, 7.0mm, 5.5mm and 4.8mm.In addition, the one or four U-shaped defect ground structure the 11st, the two or four U-shaped defect ground
Structure the 12nd, the three or the four U-shaped defect ground structure of U-shaped defect ground structure the 13 and the 4th 4 14 each between spacing be followed successively by 7.4mm,
6.5mm and 6.2mm.
As shown in Figure 4, wherein abscissa represents frequency component, unit to the frequency response simulation result of this embodiment of the invention
For GHz, ordinate represents transmission coefficient amplitude variations, and unit is dB.From the transmission coefficient result detail view in left side it can be seen that
Front four transmission zeros lay respectively at 2.31GHz, 2.59GHz, 2.79GHz and 2.98GHz, lack with single complementary type rectangular aperture
The operating frequency falling into microstrip structure [4,5,6,7] is of substantially equal.Can obtain from the wide-band simulation result on right side, 20dB declines
Subtracting and carrying a width of 2.24GHz to more than 20GHz, 3dB cut-off frequency is 2.03GHz, it is seen that 20dB attenuation bandwidth is about 3dB cutoff frequency
9 times of point.The actual area occupied of defect sturcture is only 70.0mm*12.8mm.
Although describing the present invention on the basis of above-described embodiment, but the invention is not limited in this, tool
The people having association area background knowledge can carry out various deformation on this basis, such as uses other similar defect ground structures
Unit obtains wide stopband.Therefore, these deform and other meet the thought of the present invention or have employed the skill of the present invention
Art scheme, all should belong within protection scope of the present invention.
Claims (10)
1. the Miniature wide stop-band low-pass filter based on biplane defect sturcture, this wave filter includes dielectric-slab (1), just
Face part (2), reverse side part (3), conduction band (4), earth plate (16), input port (5) and output port (6), described conduction band
(4) be horizontally installed on the front of dielectric-slab (1), the two ends of conduction band (4) respectively with described input port (5) and output port
(6) being connected, described earth plate (16) is arranged on the reverse side of dielectric-slab (1)；It is characterized in that: described front portion (2)
Including be arranged on the first complementary type rectangular aperture defected microstrip structure (7) of dielectric-slab (1) top, the second complementary type rectangular aperture
Defected microstrip structure (8), the 3rd complementary type rectangular aperture defected microstrip structure (9) and the 4th complementary type rectangular aperture defect micro-strip
Structure (10), four complementary type rectangular aperture defected microstrip structure transversely setting gradually in conduction band (4), each complementary type square
Shape flaws microstrip structure is made up of ring-like gap, the contrary inner side of opening direction (22) and outside ring-like gap (21), inner side
Ring-like gap (22) and outside ring-like gap (21) are formed by conduction band (4) etching with one heart；Described reverse side part (3) includes
One or four U-shaped defect ground structures (11), the two or four U-shaped defect ground structure (12), the three or four U-shaped defect ground structure (13) and the four or four
U-shaped defect ground structure (14), four four U-shaped defect ground structures transversely set gradually at earth plate (16), each four U-shaped defect
Ground structure is entrenched togather by four U-shaped gaps (15) and constitutes, and four U-shaped gaps (15) are formed by earth plate (16) etching,
The terminal alignment of four U-shaped gaps (15).
2. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to claim 1, it is special
Levy and be: the first complementary type rectangular aperture defected microstrip structure (7), the second complementary type rectangular aperture defected microstrip structure (8),
Three complementary types rectangular aperture defected microstrip structure (9) and the 4th complementary type rectangular aperture defected microstrip structure (10) division ring groove part gap
Length unequal beyond, other sizes are all identical.
3. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to claim 1, it is special
Levy and be: the width in ring-like gap, inner side (22) and outside ring-like gap (21) is respectively 2.4mm and 3.6mm, opening (23)
A length of 0.6mm, the spacing of inside and outside side ring groove part gap is 0.3mm.
4. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to Claims 2 or 3, its
It is characterised by: the length in ring-like gap, outside (21) is respectively 16.0mm, 14.6mm, 13.3mm and 12.1mm, the first complementary type
Rectangular aperture defected microstrip structure (7), the second complementary type rectangular aperture defected microstrip structure (8), the 3rd complementary type rectangular aperture
Spacing between defected microstrip structure (9) and the 4th complementary type rectangular aperture defected microstrip structure (10) is 3.5mm.
5. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to claim 1, it is special
Levy and be: the one or four U-shaped defect ground structure (11), the two or four U-shaped defect ground structure (12), the three or four U-shaped defect ground structure
(13) width in the U-shaped gap (15) with the four or four U-shaped defect ground structure (14) is identical, each U-shaped gap from outside to inner side
(15) lateral length is different with longitudinal length.
6. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to claim 5, it is special
Levy and be: the one or four U-shaped defect ground structure (11), the two or four U-shaped defect ground structure (12), the three or four U-shaped defect ground structure
And the width in U-shaped gap (15) of the four or four U-shaped defect ground structure (14) is 0.3mm (13).
7. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to claim 5 or 6, its
It is characterised by: from outside to inner side: the longitudinal length in the one or four each U-shaped gap (15) of U-shaped defect ground structure (11) is followed successively by
12.8mm, 10.6mm, 6.5mm and 4.8mm, lateral length is followed successively by 12.1mm, 10.7mm, 7.6mm and 5.9mm；Two or four is U-shaped
The longitudinal length in each U-shaped gap (15) of defect ground structure (12) is followed successively by 12.8mm, 10.0mm, 6.5mm and 4.8mm, laterally
Length is followed successively by 11.6mm, 9.8mm, 6.8mm and 5.5mm；Three or four each U-shaped gap (15) of U-shaped defect ground structure (13)
Width is followed successively by 12.8mm, 10.0mm, 6.5mm and 4.8mm, and lateral length is followed successively by 10.6mm, 8.6mm, 6.0mm and 5.1mm；
The longitudinal length of the four or four U-shaped defect ground structure (14) is followed successively by 12.8mm, 10.0mm, 6.5mm and 4.8mm, and lateral length depends on
Secondary for 10.3mm, 7.0mm, 5.5mm and 4.8mm.
8. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to claim 5 or 6, its
It is characterised by: the one or four U-shaped defect ground structure (11), the two or four U-shaped defect ground structure (12), the three or four U-shaped defect ground structure
(13) and the four or four U-shaped defect ground structure (14) each between spacing different.
9. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to claim 8, it is special
Levy and be: the one or four U-shaped defect ground structure (11), the two or four U-shaped defect ground structure (12), the three or four U-shaped defect ground structure
(13) and the four or four U-shaped defect ground structure (14) each between spacing be followed successively by 7.4mm, 6.5mm and 6.2mm.
10. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to claim 1, it is special
Levy and be: input port (5) and output port (6) are separately positioned on the side at dielectric-slab (1) two ends.
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| CN201410566306.3A CN104362415B (en) | 2014-10-22 | 2014-10-22 | A kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1170817A1 (en) * | 2000-07-04 | 2002-01-09 | Dal Ahn | Transmission line resonator with dielectric substrate having an etched structure on the ground plane |
| CN102496755A (en) * | 2011-12-06 | 2012-06-13 | 北京航空航天大学 | Miniaturized double-stopband microstrip filter |
| CN204205005U (en) * | 2014-10-22 | 2015-03-11 | 浙江中烟工业有限责任公司 | A kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture |
-
2014
- 2014-10-22 CN CN201410566306.3A patent/CN104362415B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1170817A1 (en) * | 2000-07-04 | 2002-01-09 | Dal Ahn | Transmission line resonator with dielectric substrate having an etched structure on the ground plane |
| CN102496755A (en) * | 2011-12-06 | 2012-06-13 | 北京航空航天大学 | Miniaturized double-stopband microstrip filter |
| CN204205005U (en) * | 2014-10-22 | 2015-03-11 | 浙江中烟工业有限责任公司 | A kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture |
Non-Patent Citations (2)
| Title |
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| 《Compact stop band filter based on double tuned rectangular split ring defected microstrip structure for ISM band applications》;Somdotta Roy Choudhury等;《2012 5th international conference on ccomputers and devices for communication》;20121231;1-4 * |
| 《Miniaturized Dual-Band Bandstop Filter Using Defected Microstrip Structure and Defected Ground Structure》;Jun Wang等;《2012 IEEE MTT-S international》;20121231;1-3 * |
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