CN101692512A - Ultra wide band bandpass filter based on ground defective grounding structure - Google Patents
Ultra wide band bandpass filter based on ground defective grounding structure Download PDFInfo
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- CN101692512A CN101692512A CN200910024124A CN200910024124A CN101692512A CN 101692512 A CN101692512 A CN 101692512A CN 200910024124 A CN200910024124 A CN 200910024124A CN 200910024124 A CN200910024124 A CN 200910024124A CN 101692512 A CN101692512 A CN 101692512A
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- bandpass filter
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Abstract
The invention discloses an ultra wide band bandpass filter based on ground defective grounding structure. The bandpass filter comprises a circuit board with micro-strip boards coated on two sides, on the front surface of the bandpass filter and a ground plate on the back surface of the bandpass filter, wherein the circuit board comprises a first coupling micro-strip board and a second coupling micro-strip board which are parallel to each other, the coupling micro-strip board is connected with an input terminal through an input terminal transmission line, the second coupling micro-strip board is connected with an output terminal through an output terminal transmission line; the ground plate comprises a first, second and third inverse S-shaped defective grounding structures, wherein the first inverse S-shaped defective grounding structure is arranged at the center of the space under the first coupling micro-strip board and the second coupling micro-strip board which are parallel to each other on the circuit board, and the second and third inverse S-shaped defective grounding structures are arranged symmetrically on the two sides of the first inverse S-shaped defective grounding structure and separately arranged at the centers of the spaces under the output terminal transmission line and the input terminal transmission line. The ultra wide band bandpass filter based on ground defective grounding structure of the invention is a DGS ultra wide band bandpass filter of which wideband can cover any ultra wide band frequency section (3.1-10.6GHz).
Description
Technical field
The present invention relates to the filter in microwave communication field, particularly a kind of ultra wide band bandpass filter based on ground defective grounding structure.
Background technology
Along with developing rapidly of the communication technology, people are more and more higher to the requirement of the information transmission system.Under this background, advantages such as super-broadband tech is simple with its system, cost is low, power consumption is little, data transmission bauds is fast, fail safe height become a research focus of the present communications field.Since 2002 FCC (FCC) lifted a ban the frequency spectrum of 3.1-10.6GHz section, and enable to be applied to after the ultra-wideband devices, started the research boom of one super-broadband tech especially in academia and industry manufacture field.And filter is being played the part of considerable role in whole radio frequency ultra broadband circuit system.Its characteristic quality plays important effect for the overall performance of system.
Existing broadband band-pass filter mainly comprises parallel coupled line filter, interdigital filter, and comb line filter, and open circuit or short circuit minor matters filter etc., but to reach the degree of bandwidth be limited for they, general relative bandwidth is no more than 50%.And traditional method for designing all is difficult to realize with any dielectric material because the ratio of the parity mode impedance of coupling line is excessive.
Because (Defected Ground Structure, the DGS) characteristic that can cause special band resistance (bandstop) of frequency band or band to lead to (bandpass), so people also begins thinking and is introduced in the ultra broadband design ground defective grounding structure.And traditional scarce earth subsidence structure is generally " dumbbell " type or " rectangle ", and the characteristics of this structure are to introduce transmission zero, but its Insertion Loss is relatively large, and selectivity is relatively poor.And be not that design is complicated based on the ultra-wide band filter of DGS at present, be exactly that loss is bigger, structure does not have versatility, is difficult to design easily the ultra-wide band filter of any frequency range.
Consulting existing document through the applicant finds, Chinese patent application " super wide band microstrip filter " (application number: 200610117045.2) adopt high pass and low pass filter to combine and realize the ultra broadband characteristic of filter, the DGS structure and the slot element of 7 dumbbell shapes have been adopted in this invention, its complex structure, tuning parameter is many, and design is got up very difficult; It is relatively large to add " dumbbell " type DGS Insertion Loss, and selectivity is relatively poor, thus this kind filter band in maximum Insertion Loss reach-1.5dB, be with outer inhibition can only reach-below the 20dB.
Summary of the invention
At defective that exists in the above-mentioned prior art or deficiency, the object of the present invention is to provide a kind of ultra wide band bandpass filter based on ground defective grounding structure, it is simple in structure, bandwidth can cover any ultra broadband frequency range (in the 3.1-10.6GHz section), and the outer signal of inhibition zone effectively, decay can be reached more than the 35dB.
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of ultra wide band bandpass filter based on ground defective grounding structure comprises circuit board on the front that is arranged on the little band plate of two-sided deposited copper and the ground plate on the reverse side, it is characterized in that:
Described circuit board comprises two the first parallel coupled microstrip lines and second coupled microstrip line, and first coupled microstrip line is connected with input port by the input transmission line, and second coupled microstrip line is connected with output port by the output transmission line;
Described ground plate comprises that first, second and the 3rd " S " type that falls lack the earth subsidence structure, and it is that etching is gone the formed air element of the shape of falling the serpentine accordingly on ground plate that described first, second lacks the earth subsidence structure with the 3rd " S " type that falls; Wherein, first " S " type that falls lack the earth subsidence structure be positioned at two first, second parallel coupled microstrip lines of circuit board under the center, second " S " type that falls lacks earth subsidence structure and the 3rd " S " type that falls and lacks earth subsidence symmetrical configuration first " S " type that falls that is distributed in and lack the both sides of earth subsidence structure, and lay respectively at output transmission line 3 and input transmission line under the center.
Ultra wide band bandpass filter based on ground defective grounding structure of the present invention has been realized the ultra wideband of filter, guarantees the high selectivity that the filter band is outer simultaneously.It is the DGS ultra wide band bandpass filter that a kind of bandwidth can cover any ultra broadband frequency range (in the 3.1-10.6GHz section).
Description of drawings
Fig. 1 is the ultra wide band bandpass filter general structure schematic diagram based on ground defective grounding structure of the present invention;
Fig. 2 is the ultra wide band bandpass filter front board structure of circuit schematic diagram based on ground defective grounding structure of the present invention;
Fig. 3 is the ultra wide band bandpass filter back side ground plate structural representation based on ground defective grounding structure of the present invention;
Fig. 4 is the ultra wide band bandpass filter mid portion structural representation based on ground defective grounding structure of the present invention;
Fig. 5 is the equivalent circuit diagram of the ultra wide band bandpass filter mid portion structure based on ground defective grounding structure of the present invention;
Fig. 6 is the frequency characteristic schematic diagram of the ultra wide band bandpass filter mid portion structure based on ground defective grounding structure of the present invention;
Fig. 7 is the ultra wide band bandpass filter front circuit board two side portions structural representation based on ground defective grounding structure of the present invention;
Fig. 8 is the equivalent circuit diagram of the ultra wide band bandpass filter two side portions structure based on ground defective grounding structure of the present invention;
Fig. 9 is the frequency characteristic schematic diagram of the ultra wide band bandpass filter two side portions structure based on ground defective grounding structure of the present invention;
Figure 10 is the transmission response comparison diagram of two kinds of structures;
Figure 11 is a frequency characteristic schematic diagram of surveying based on the ultra wide band bandpass filter of ground defective grounding structure of the present invention.
The present invention is described in further detail below in conjunction with drawings and Examples.
Embodiment
Referring to accompanying drawing, the ultra wide band bandpass filter based on ground defective grounding structure of the present invention comprises circuit board 11 on the front that is arranged on the little band plate of two-sided deposited copper and the ground plate 10 on the reverse side;
Described ground plate 10 comprises that first, second and the 3rd " S " type that falls lack earth subsidence structure (5,6,7), and it is that etching is gone the formed air element of the shape of falling the serpentine accordingly on ground plate 10 that above-mentioned first, second lacks earth subsidence structure (5,6,7) with the 3rd " S " type that falls; Wherein, first " S " type that falls lack earth subsidence structure (5) be positioned at 11 two first, second parallel coupled microstrip lines of circuit board (1,2) under the center, second " S " type that falls lacks earth subsidence structure 6 and the 3rd " S " type that falls and lacks earth subsidence structure 7 first " S " type that falls that is symmetrically distributed in and lack the both sides of earth subsidence structure 5, and lay respectively at output transmission line 3 and input transmission line 4 under the center.
The size that first " S " type that falls lacks the shape of falling the serpentine area of earth subsidence structure 5 is used to determine the centre frequency of ultra wide band bandpass filter; Second " S " type that falls lacks the big or small outer selectivity of band that influences ultra wide band bandpass filter of the shape of falling the serpentine that earth subsidence structure 6 and the 3rd " S " type that falls lacks earth subsidence structure 7.
Described first coupled microstrip line 1 and second coupled microstrip line 2 are uniform transmission lines, or sawtooth pattern or other bending shape molded lines.The length of first coupled microstrip line 1 and second coupled microstrip line 2 and width are used to determine the high-end cut-off frequency of ultra wide band bandpass filter;
The width of output transmission line 3 and input transmission line 4 can influence the interior and outer selectivity of band of band of ultra wide band bandpass filter.
It is to etch on the ground plane of ground plate 10 that " S " type that falls of described reverse side part lacks earth subsidence structure (5,6,7).
This shows, because the bandwidth of the ultra wide band bandpass filter based on ground defective grounding structure of the present invention is lacked earth subsidence structure (5,6,7) by first, second and the 3rd " S " type that falls area and parallel first, second coupled microstrip line (1,2) and be connected input port 9 and the output transmission line 3 of output port 8 and input transmission line 4 determine, therefore can design the ultra-wide band filter of any bandwidth as required.
Shown in Fig. 4,5,6, ultra wide band bandpass filter mid portion structure has the ultra broadband characteristic.The equivalent circuit diagram of the ultra wide band bandpass filter mid portion structure based on ground defective grounding structure of the present invention as shown in Figure 5, comprise inductance L 1, L2 and L3, capacitor C 1, Ca and C3, wherein L1 and C1 series connection constitutes a branch road, C3 and L3 formation in parallel one branch road, L2 and Ca are respectively at two ends.Fig. 6 has provided the circuit simulation result and the ANSOFT HFSS modeling and simulating result in kind of the ultra wide band bandpass filter mid portion structure based on ground defective grounding structure of the present invention, and it is fine that the two coincide.
Shown in Fig. 7,8,9, ultra wide band bandpass filter two side portions structure has low-pass characteristic.Wherein, the equivalent circuit diagram of the ultra wide band bandpass filter two side portions structure based on ground defective grounding structure of the present invention comprises inductance L 1, L2, capacitor C 1, C2, and wherein L1 and C1 series connection constitutes a branch road, and C2 constitutes a branch road, and L2 is respectively at two ends.Fig. 9 has provided the circuit simulation result and the ANSOFT HFSS modeling and simulating result in kind of the ultra wide band bandpass filter two side portions structure based on ground defective grounding structure of the present invention, and it is fine that the two coincide.
As shown in figure 10, compare and the dumbbell shape structure, " S " type band that falls is interior corresponding very smooth, and attenuation outside a channel is very fast.
By actual fabrication and test, the transmission parameter that obtains such as Figure 11, bandwidth can reach 3.3-10GHz, maximum Insertion Loss is 0.8dB, passband return loss maximum is-10dB, its attenuation outside a channel-below the 35dB.
The ultra wide band bandpass filter based on ground defective grounding structure among the present invention can be down that beyond " S " type other is abnormally-structured, as " E " type, and " recessed " type etc.
Parallel coupled line among the present invention also can change to sawtooth pattern or other bending shape structure.
Above embodiment, it only is a preferred embodiment of the present invention, be used to further specify the present invention, can not limit scope of the invention process with this embodiment, be that all simple equivalent of being done according to claim of the present invention and description of the invention content change and modification, all should still belong to the scope that patent of the present invention covers.
Claims (6)
1. ultra wide band bandpass filter based on ground defective grounding structure comprises circuit board (11) on the front that is arranged on the little band plate of two-sided deposited copper and the ground plate (10) on the reverse side, it is characterized in that:
Described circuit board (11) comprises two parallel first coupled microstrip lines (1) and second coupled microstrip line (2), first coupled microstrip line (1) is connected with input port (9) by input transmission line (4), and second coupled microstrip line (2) is connected with output port (8) by output transmission line (3);
Described ground plate (10) comprises that first, second and the 3rd " S " type that falls lack earth subsidence structure (5,6,7), and it is that etching is gone the formed air element of the shape of falling the serpentine accordingly on ground plate (10) that described first, second lacks earth subsidence structure (5,6,7) with the 3rd " S " type that falls; Wherein, first " S " type that falls lack earth subsidence structure (5) be positioned at (11) two first, second parallel coupled microstrip lines of circuit board (1,2) under the center, second " S " type that falls lacks earth subsidence structure (6) and the 3rd " S " type that falls and lacks earth subsidence structure (7) and be symmetrically distributed in first and fall the both sides of the scarce earth subsidence structure (5) of " S " type, and lay respectively at output transmission line (3) and input transmission line (4) under the center.
2. the ultra wide band bandpass filter based on ground defective grounding structure as claimed in claim 1, it is characterized in that the size that described first " S " type that falls lacks the shape of falling the serpentine area of earth subsidence structure (5) is used to determine the centre frequency of ultra wide band bandpass filter; Second " S " type that falls lacks the big or small outer selectivity of band that influences ultra wide band bandpass filter of the shape of falling the serpentine that earth subsidence structure (6) and the 3rd " S " type that falls lacks earth subsidence structure (7).
3. the ultra wide band bandpass filter based on ground defective grounding structure as claimed in claim 1 is characterized in that, it is that " E " type or " recessed " type or other are abnormally-structured that described first, second and the 3rd " S " type that falls lack earth subsidence structure (5,6,7).
4. the ultra wide band bandpass filter based on ground defective grounding structure as claimed in claim 1 is characterized in that, described first coupled microstrip line (1) and second coupled microstrip line (2) are uniform transmission lines, or sawtooth pattern or other bending shape molded lines.
5. the ultra wide band bandpass filter based on ground defective grounding structure as claimed in claim 1, it is characterized in that the length of described first coupled microstrip line (1) and second coupled microstrip line (2) and width are used to determine the high-end cut-off frequency of ultra wide band bandpass filter; The width of described output transmission line (3) and input transmission line (4) can influence the interior and outer selectivity of band of band of ultra wide band bandpass filter.
6. the ultra wide band bandpass filter based on ground defective grounding structure as claimed in claim 1 is characterized in that, described output transmission line (3) and input transmission line (4) are the transmission lines of the inhomogeneous form of uniform transmission line or step conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100241242A CN101692512B (en) | 2009-09-28 | 2009-09-28 | Ultra wide band bandpass filter based on ground defective grounding structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100241242A CN101692512B (en) | 2009-09-28 | 2009-09-28 | Ultra wide band bandpass filter based on ground defective grounding structure |
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| CN101692512A true CN101692512A (en) | 2010-04-07 |
| CN101692512B CN101692512B (en) | 2012-08-01 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101853975A (en) * | 2010-04-27 | 2010-10-06 | 华东交通大学 | Low-loss band-pass filter based on defected ground structure |
| CN103152002A (en) * | 2011-12-07 | 2013-06-12 | 天津海泰超导电子有限公司 | Conode series resonance structure inductance-capacitance filter |
| CN103943922A (en) * | 2014-04-30 | 2014-07-23 | 南通大学 | Harmonic suppression band-pass filter and manufacturing method thereof |
| CN104966870A (en) * | 2015-06-29 | 2015-10-07 | 南京理工大学 | UHF wave band high performance filter set based on LTCC technology and DGS technology |
| CN107086339A (en) * | 2017-04-17 | 2017-08-22 | 电子科技大学 | A kind of ultra-wide band filter based on novel defected microstrip structure |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1901274B (en) * | 2006-07-27 | 2010-11-03 | 上海交通大学 | Super wide band plane microstrip filter |
| CN100435409C (en) * | 2006-10-12 | 2008-11-19 | 上海交通大学 | Super wide band microstrip filter |
| CN100566147C (en) * | 2007-05-17 | 2009-12-02 | 上海交通大学 | Can suppress the small wide-frequency filter that the wireless LAN communication signal disturbs |
| CN101246992B (en) * | 2008-03-21 | 2011-09-28 | 东南大学 | Miniaturized ultra-wideband antenna with dual-attenuation band function |
-
2009
- 2009-09-28 CN CN2009100241242A patent/CN101692512B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101853975A (en) * | 2010-04-27 | 2010-10-06 | 华东交通大学 | Low-loss band-pass filter based on defected ground structure |
| CN103152002A (en) * | 2011-12-07 | 2013-06-12 | 天津海泰超导电子有限公司 | Conode series resonance structure inductance-capacitance filter |
| CN103943922A (en) * | 2014-04-30 | 2014-07-23 | 南通大学 | Harmonic suppression band-pass filter and manufacturing method thereof |
| CN104966870A (en) * | 2015-06-29 | 2015-10-07 | 南京理工大学 | UHF wave band high performance filter set based on LTCC technology and DGS technology |
| CN107086339A (en) * | 2017-04-17 | 2017-08-22 | 电子科技大学 | A kind of ultra-wide band filter based on novel defected microstrip structure |
| CN107086339B (en) * | 2017-04-17 | 2019-04-05 | 电子科技大学 | A kind of ultra-wide band filter based on novel defected microstrip structure |
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| CN101692512B (en) | 2012-08-01 |
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