CN204205005U - 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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- CN204205005U CN204205005U CN201420613458.XU CN201420613458U CN204205005U CN 204205005 U CN204205005 U CN 204205005U CN 201420613458 U CN201420613458 U CN 201420613458U CN 204205005 U CN204205005 U CN 204205005U
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Abstract
The utility model relates to a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture, this filter comprises dielectric-slab, front portion, reverse side part, conduction band, ground 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 output port with input port respectively, and ground plate is arranged on dielectric-slab reverse side; Front portion comprises the first complementary type rectangular aperture defected microstrip structure, 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 that are arranged on above dielectric-slab, each complementary type rectangular aperture defected microstrip structure is made up of the contrary ring-like gap, inner side of two opening directions and outer ring groove part gap, and ring-like gap, inner side and outer ring groove part gap are formed by conduction band etching with one heart.The utility model decreases the area of whole device, and can obtain wide stopband by the working frequency points reasonably adjusting defect sturcture.
Description
Technical field
The utility model belongs to technical field of micro communication, particularly relates to a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture, 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 and suppresses harmonic wave in wireless communication system and parasitic disturbances signal.In many microwave applications, there is urgent demand to the low pass filter of compact size and Wide stop bands.Miniaturization is the important requirement of electronic equipment, particularly for handheld wireless device, after utilizing monolithic integrated circuit that amplifier, frequency mixer and modulator etc. are integrated into reduction chip piece reaching circuit volume, the size realizing filter is just needed to reduce.Wide stop bands can suppress interference signal in large frequency range, if adopt multiple cascode device to suppress to reach identical interference signal, can cause the increase of equipment size and the rising of cost.
Defect ground structure (Defected Ground Structure, DGS) be the defect pattern etching definite shape on the ground plate of planar transmission line, its maximum advantage has significant stopband and Slow-wave effect characteristic, this is because the defect on ground plate disturbs CURRENT DISTRIBUTION, result in the change of transmission line equivalent inductance and electric capacity.Because each DGS unit can produce a transmission zero, wide stopband can be realized by multiple DGS unit of cascade different length.The shape of DGS decides the frequency response of device to a great extent, and for this reason, people develop the DGS unit of various shape in succession, as complementary type split ring, fractal structure etc.In order to the Stopband Performance obtained, often need cascade a lot of construction units, the increase of physical size and the deterioration of band-pass behavior can be caused thereupon.
As the extension of defect ground structure, defected microstrip structure (the Defected Microstrip Structure developed in recent years, DMS) be etch even or non-homogeneous slit on micro-band conduction band, there is significant stopband and Slow-wave effect equally, and there is less electromagnetic interference surface noise, the new degree of freedom can be provided for the realization of high performance device.Biplanar defect sturcture layout is utilized to provide good means by the reduction for device size.Through finding the literature search of prior art, biplane defect is utilized to realize the report of high performance mini device less.Such as, in March, 2012, the people such as Zhu Haoran was at IEEE Antennas and Wireless Propagation Letters, 11 curly hair are shown " Miniaturized Tapered EBG Structure with Wide Stopband and Flat Passband(has the miniaturized gradual change EBG structure of Wide stop bands and flat passband) ", the paper proposes and utilize the EBG structure of biplane gradual change to realize Wide stop bands and smooth passband, and introduce extra crestal line and increase bandwidth of rejection further with open circuit minor matters, but the low pass filter with more Wide stop bands bandwidth sum more compact size still needs further research.
Summary of the invention
For the deficiency existed in the existing actualizing technology of low pass filter, the utility model proposes a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture, to solve the problems such as the comparatively large and stopband of existing low pass filter size is narrower.
A kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture, this filter comprises dielectric-slab, front portion, reverse side part, conduction band, ground plate, input port and output port, described conduction band is horizontally installed on the front of dielectric-slab, the two ends of conduction band are connected with output port with described input port respectively, and described ground plate is arranged on dielectric-slab reverse side; Described front portion comprises the first complementary type rectangular aperture defected microstrip structure, 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 that are arranged on above dielectric-slab, four complementary type rectangular aperture defected microstrip structures transversely setting gradually at conduction band, each complementary type rectangular aperture defected microstrip structure is made up of the contrary ring-like gap, inner side of two opening directions and outer ring groove part gap, and ring-like gap, inner side and outer ring groove part gap are formed by conduction band etching with one heart; Described reverse side part comprises 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, four four U-shaped defect ground structures transversely set gradually at ground plate, each four U-shaped defect ground structures are entrenched togather by four U-shaped gaps and form, four U-shaped gaps are formed by ground plate etching, the terminal alignment in four U-shaped gaps.
As preferably, beyond the length of the first described complementary type rectangular aperture defected microstrip structure, 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 division ring groove part gap is unequal, other size is all identical.
As most preferably, the width of ring-like gap, described inner side and outer ring groove part gap is respectively 2.4mm and 3.6mm, and the length of opening is 0.6mm, and the spacing of interior outer ring groove part gap is 0.3mm.
As most preferably, the length of described outer ring groove part gap is respectively 16.0mm, 14.6mm, 13.3mm and 12.1mm, and the first complementary type rectangular aperture defected microstrip structure, the second complementary type rectangular aperture defected microstrip structure, spacing between the 3rd complementary type rectangular aperture defected microstrip structure and the 4th complementary type rectangular aperture defected microstrip structure are 3.5mm.
As preferably, the one or four described U-shaped defect ground structure, the two or four U-shaped defect ground structure, the three or four U-shaped defect ground structure are identical with the width in the U-shaped gap of the four or four U-shaped defect ground structure, and from outside to inner side, the lateral length in each U-shaped gap is different with longitudinal length.
As most preferably, the width in the U-shaped gap of 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 is 0.3mm.
As most preferably, from outside to inner side: the longitudinal length in the one or the four each U-shaped gap of U-shaped defect ground structure is followed successively by 12.8mm, 10.6mm, 6.5mm and 4.8mm, and lateral length is followed successively by 12.1mm, 10.7mm, 7.6mm and 5.9mm; The longitudinal length in the two or the four each U-shaped gap of U-shaped defect ground structure is followed successively by 12.8mm, 10.0mm, 6.5mm and 4.8mm, and lateral length is followed successively by 11.6mm, 9.8mm, 6.8mm and 5.5mm; The width in the three or the four each U-shaped gap of U-shaped defect ground structure 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 is followed successively by 12.8mm, 10.0mm, 6.5mm and 4.8mm, and lateral length is 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 separately 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 defect ground structure and the four or four U-shaped defect ground structure separately 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 described in the utility model, its first, second, third and fourth transmission zero is produced by four complementary type rectangular aperture defected microstrip structures to ensure the low-loss in passband to the abrupt transition and passband of stopband, and each four U-shaped defect ground structures can provide the fundamental resonance point of four independent regulation.The utility model realizes wide stopband by utilizing the transmission zero of four U-shaped defect ground structures generations simultaneously, and by utilizing the Slow-wave effect of biplanar layout and defect sturcture to meet the demand of device miniaturization.
The Miniature wide stop-band low-pass filter that the utility model proposes, take full advantage of micro-band conduction band and the space connecing ground plate, by the area adopting biplanar layout greatly can reduce whole device, and wide stopband can be obtained by the working frequency points reasonably adjusting defect sturcture.Meanwhile, the first eight transmission zero of this filter can independently control, thus the time in very big reduction device design process needed for simulation optimization.
Accompanying drawing explanation
Fig. 1 is the general structure schematic diagram of the utility model based on the Miniature wide stop-band low-pass filter of biplane defect sturcture.
Fig. 2 is the Facad structure schematic diagram of the utility model based on the Miniature wide stop-band low-pass filter of biplane defect sturcture.
Fig. 3 is the inverse layer structure schematic diagram of the utility model based on the Miniature wide stop-band low-pass filter of biplane defect sturcture.
Fig. 4 frequency response results that to be the utility model emulate based on the Miniature wide stop-band low-pass filter of biplane defect sturcture.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model 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 filter comprises dielectric-slab 1, front portion 2, reverse side part 3, conduction band 4, ground plate 16, input port 5 and output port 6, described conduction band 4 is horizontally installed on the front of dielectric-slab 1, the two ends of conduction band 4 are connected with output port 6 with described input port 5 respectively, and described ground plate 16 is arranged on dielectric-slab 1 reverse side; Described input port 5 and output port 6 are separately positioned on the side at dielectric-slab 1 two ends.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 the characteristic impedance of 50 Ω.
As shown in Figure 2, described front portion 2 comprises the first complementary type rectangular aperture defected microstrip structure 7 be arranged on above dielectric-slab 1, second complementary type rectangular aperture defected microstrip structure 8, 3rd complementary type rectangular aperture defected microstrip structure 9 and the 4th complementary type rectangular aperture defected microstrip structure 10, four complementary type rectangular aperture defected microstrip structures transversely setting gradually at conduction band 4, each complementary type rectangular aperture defected microstrip structure is made up of the contrary ring-like gap 22, inner side of two opening directions and outer ring groove part gap 21, ring-like gap 22, inner side and outer ring groove part gap 21 etch by conduction band 4 with one heart and are formed.The first described complementary type rectangular aperture defected microstrip structure 7, second complementary type rectangular aperture defected microstrip structure the 8, the 3rd complementary type rectangular aperture defected microstrip structure 9 and the length of the 4th complementary type rectangular aperture defected microstrip structure 10 division ring groove part gap unequal beyond, other size is all identical.The ring-like gap 22, inner side of each complementary type rectangular aperture defected microstrip structure and the width of outer ring groove part gap 21 are respectively 2.4mm and 3.6mm, and the length of opening 23 is 0.6mm, and the spacing of interior outer ring groove part gap 21 is 0.3mm; The length of four outer ring groove part gaps 21 is respectively 16.0mm, 14.6mm, 13.3mm and 12.1mm.Spacing between first complementary type rectangular aperture defected microstrip structure 7, second complementary type rectangular aperture defected microstrip structure the 8, the 3rd complementary type rectangular aperture defected microstrip structure 9 and the 4th complementary type rectangular aperture defected microstrip structure 10 is 3.5mm.
As shown in Figure 3, described reverse side part 3 comprises the U-shaped defect ground structure 14 of the one or four U-shaped defect ground structure the 11, the 24 U-shaped defect ground structure the 12, the 34 U-shaped defect ground structure the 13 and the 44, four four U-shaped defect ground structures transversely set gradually at ground plate 16, each four U-shaped defect ground structures are entrenched togather by four U-shaped gaps 15 and form, four U-shaped gaps 15 etch by ground plate 16 and are formed, the terminal alignment in four U-shaped gaps 15.The U-shaped defect ground structure 13 of described the 1 U-shaped defect ground structure the 11, the 24 U-shaped defect ground structure the 12, the 34 is identical with the width in the U-shaped gap 15 of the four or four U-shaped defect ground structure 14, and from outside to inner side, the lateral length in each U-shaped gap 15 is different with longitudinal length.The width in the U-shaped gap 15 of four U-shaped defect ground structures is 0.3mm.From outside to inner side: the longitudinal length in the one or the 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, and lateral length is followed successively by 12.1mm, 10.7mm, 7.6mm and 5.9mm; The longitudinal length in the two or the four each U-shaped gap 15 of U-shaped defect ground structure 12 is followed successively by 12.8mm, 10.0mm, 6.5mm and 4.8mm, and lateral length is followed successively by 11.6mm, 9.8mm, 6.8mm and 5.5mm; The width in the three or the four each U-shaped gap 15 of U-shaped defect ground structure 13 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 is followed successively by 10.3mm, 7.0mm, 5.5mm and 4.8mm.In addition, the U-shaped defect ground structure 14 of the one or four U-shaped defect ground structure the 11, the 24 U-shaped defect ground structure the 12, the 34 U-shaped defect ground structure the 13 and the 44 separately between spacing be followed successively by 7.4mm, 6.5mm and 6.2mm.
As shown in Figure 4, wherein abscissa represents frequency component to the frequency response simulation result of this embodiment of the utility model, and unit is GHz, and ordinate represents transmission coefficient amplitude variations, and unit is dB.As can be seen from the transmission coefficient result detail view in left side, front four transmission zeros lay respectively at 2.31GHz, 2.59GHz, 2.79GHz and 2.98GHz, substantially equal with the operating frequency of single complementary type rectangular aperture defected microstrip structure [4,5,6,7].Can obtain from the wide-band simulation result on right side, 20dB attenuation bandwidth is 2.24GHz is 2.03GHz to ending frequency more than 20GHz, 3dB, and visible 20dB attenuation bandwidth is about 9 times that 3dB ends frequency.The area occupied of defect sturcture reality is only 70.0mm*12.8mm.
Although be illustrated the utility model on the basis of above-described embodiment, but the utility model is not limited thereto, the people with association area background knowledge can carry out various deformation on this basis, and the defect ground structure unit such as adopting other similar is to obtain wide stopband.Therefore, these are out of shape and other meets thought of the present utility model or have employed the technical solution of the utility model, all should belong within protection range of the present utility model.
Claims (10)
1. the Miniature wide stop-band low-pass filter based on biplane defect sturcture, this filter comprises dielectric-slab (1), front portion (2), reverse side part (3), conduction band (4), ground plate (16), input port (5) and output port (6), described conduction band (4) is horizontally installed on the front of dielectric-slab (1), the two ends of conduction band (4) are connected with output port (6) with described input port (5) respectively, and described ground plate (16) is arranged on the reverse side of dielectric-slab (1), it is characterized in that: described front portion (2) comprises the first complementary type rectangular aperture defected microstrip structure (7) being arranged on dielectric-slab (1) top, second complementary type rectangular aperture defected microstrip structure (8), 3rd complementary type rectangular aperture defected microstrip structure (9) and the 4th complementary type rectangular aperture defected microstrip structure (10), four complementary type rectangular aperture defected microstrip structures transversely setting gradually in conduction band (4), each complementary type rectangular aperture defected microstrip structure is made up of the contrary ring-like gap, inner side (22) of two opening directions and outer ring groove part gap (21), ring-like gap, inner side (22) and outer ring groove part gap (21) are formed by conduction band (4) etching with one heart, described reverse side part (3) comprises 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), four four U-shaped defect ground structures transversely set gradually at ground plate (16), each four U-shaped defect ground structures are entrenched togather by four U-shaped gaps (15) and form, four U-shaped gaps (15) are formed by ground 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 characterized in that: beyond the length of 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 defected microstrip structure (9) and the 4th complementary type rectangular aperture defected microstrip structure (10) division ring groove part gap is unequal, other size is all identical.
3. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to claim 1, it is characterized in that: the width of ring-like gap, inner side (22) and outer ring groove part gap (21) is respectively 2.4mm and 3.6mm, the length of opening (23) is 0.6mm, and the spacing of interior outer ring groove part gap (21) 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, it is characterized in that: the length of outer ring groove part gap (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), spacing between the 3rd complementary type rectangular aperture defected microstrip structure (9) and the 4th complementary type rectangular aperture defected microstrip structure (10) are 3.5mm.
5. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to claim 1, it is characterized in that: 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) are identical with the width in the U-shaped gap (15) of the four or four U-shaped defect ground structure (14), from outside to inner side, the lateral length of each U-shaped gap (15) 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, is characterized in that: the width in the U-shaped gap (15) of 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) is 0.3mm.
7. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to claim 5 or 6, it is characterized in that: from outside to inner side: the longitudinal length of each U-shaped gap (15) of the one or four U-shaped defect ground structure (11) is followed successively by 12.8mm, 10.6mm, 6.5mm and 4.8mm, and lateral length is followed successively by 12.1mm, 10.7mm, 7.6mm and 5.9mm; The longitudinal length of each U-shaped gap (15) of the two or four U-shaped defect ground structure (12) is followed successively by 12.8mm, 10.0mm, 6.5mm and 4.8mm, and lateral length is followed successively by 11.6mm, 9.8mm, 6.8mm and 5.5mm; The width of each U-shaped gap (15) of the three or four U-shaped defect ground structure (13) 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 is followed successively by 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, is characterized in that: the spacing between 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) are respective is different.
9. a kind of Miniature wide stop-band low-pass filter based on biplane defect sturcture according to claim 8, is characterized in that: the spacing between 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) are respective is 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, is characterized in that: input port (5) and output port (6) are separately positioned on the side at dielectric-slab (1) two ends.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362415A (en) * | 2014-10-22 | 2015-02-18 | 浙江中烟工业有限责任公司 | Dual-plane defect structure based miniaturized wide-stopband low-pass filter |
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- 2014-10-22 CN CN201420613458.XU patent/CN204205005U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362415A (en) * | 2014-10-22 | 2015-02-18 | 浙江中烟工业有限责任公司 | Dual-plane defect structure based miniaturized wide-stopband low-pass filter |
| CN104362415B (en) * | 2014-10-22 | 2016-11-23 | 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 |
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