CN103633399A - Microstrip ultra wide stop band low pass filter - Google Patents
Microstrip ultra wide stop band low pass filter Download PDFInfo
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- CN103633399A CN103633399A CN201310582748.2A CN201310582748A CN103633399A CN 103633399 A CN103633399 A CN 103633399A CN 201310582748 A CN201310582748 A CN 201310582748A CN 103633399 A CN103633399 A CN 103633399A
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Abstract
The invention discloses a microstrip ultra wide stop band low pass filter. The filter comprises a double-faced copper-coated microstrip plate with two surfaces, wherein an input end feeder, an output end feeder, uniformity impedance resonators which are opposite left and right, step impedance resonators which are opposite up and down and connecting wires are respectively made on the same surface of the double-faced copper-coated microstrip plate, a defected ground structure is made on the other surface of the double-faced copper-coated microstrip plate, the step impedance resonators which are opposite up and down are mutually connected and are arranged between the uniformity impedance resonators which are opposite left and right, the uniformity impedance resonators which are opposite left and right are respectively connected with the step impedance resonators which are opposite up and down by the respective corresponding connecting wire, and the input end feeder and the output end feeder are respectively connected with the corresponding uniformity impedance resonator. The microstrip ultra wide-stop band low pass filter has the advantages of simple and reliable structure, good selectivity, low loss, fast roll-off, small size, low cost, ultra wide stop band and the like.
Description
Technical field
The present invention relates to the technical field of high frequency assembly, refer in particular to a kind of micro-super wide stop-band low-pass filter of being with.
Background technology
Flourish along with information industry and wireless communication system, microwave spectrum resource day is becoming tight, the application of various microwave and millimeter wave circuit, assembly and system is more and more extensive, the division of frequency band is more and more meticulousr, utilance is more and more higher, and low pass filter is as one of part important in Circuits System, the quality of its performance has largely determined the work quality of system.Low pass filter refers to that the signal of allowing lower than cut-off frequency passes through, but the intransitable filter of signal higher than cut-off frequency, it operates mainly in the prime of communication system transmitting end and the rear class of receiving terminal, and for suppressing harmonic wave and noise signal, useful signal is passed through in low-loss.
In the last few years, in order to design, volume is little, little with internal loss, well behaved low pass filter fast, super wide stopband roll-offs, scholars have proposed many novel resonator structures, and wherein some shows good performance really: stopband is wider, roll-off very fast; And some also can show wider bandwidth of rejection by cascading up, yet volume is excessive, is not easy to integrated.Except setting about from micro-belt surface structure, because thering is band gap properties and slow wave characteristic, many scholars have also put into energy various defect ground structures, thereby on single microstrip line, add defect ground can introduce the effect that transmission zero can produce low pass filter.Yet above various measures are still not good enough for representing in super wide stopband and smaller size smaller aspect.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of rational in infrastructure reliable, selectivity is good, low-loss, roll-off fast, volume is little, cost is low, there is super wide stopband be micro-ly with super wide stop-band low-pass filter.
For achieving the above object, technical scheme provided by the present invention is: a kind of micro-super wide stop-band low-pass filter of being with, comprise the micro-band plate of double-sided copper-clad, on the same face of the micro-band plate of described double-sided copper-clad, be manufactured with respectively input feeder line for feed-in electromagnetic wave signal, for feeding out relative uniform impedance resonator, Stepped Impedance resonator opposing upper and lower, the connecting line in output feeder line, left and right of electromagnetic wave signal, on the another side of the micro-band plate of described double-sided copper-clad, be manufactured with defect ground structure; Wherein, described Stepped Impedance resonator opposing upper and lower interconnects, and corresponding being located between the relative uniform impedance resonator in left and right, the relative uniform impedance resonator in described left and right is connected with described Stepped Impedance resonator opposing upper and lower by corresponding connecting line separately respectively, and described input feeder line is connected with corresponding uniform impedance resonator respectively with output feeder line.
Described input feeder line and output feeder line are the matched impedance of 50 ohm.
In the relative uniform impedance resonator in described left and right, one side every, have a pair of uniform impedance resonator opposing upper and lower at least, and described uniform impedance resonator opposing upper and lower interconnects.
Two transmission lines that each Stepped Impedance resonator differs by width form, and described Stepped Impedance resonator opposing upper and lower connects by close separately transmission line, the relative uniform impedance resonator in described left and right is connected with the transmission line that described Stepped Impedance resonator leans on mutually by connecting line.
Described Stepped Impedance resonator opposing upper and lower has at least a pair of.
Described defect ground structure be shaped as dumbbell shaped.
The relative uniform impedance resonator in described left and right all folds crooked, and all scabble corner.
In each Stepped Impedance resonator, wider transmission line all folds bending, and all scabble corner.
The uniform impedance resonator mirror picture symmetry that described left and right is relative, described Stepped Impedance resonator mirror picture opposing upper and lower is symmetrical.
Described uniform impedance resonator mirror picture opposing upper and lower is symmetrical.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, in conjunction with uniform impedance resonator, Stepped Impedance resonator, the three kinds of a plurality of transmission zeros of structure generation in defect ground, greatly expanded the bandwidth of rejection of low pass filter, represent super wide stopband character;
2, when guaranteeing super wide stopband, there is outstanding performance insertion loss, return loss and selectivity aspect;
3, this structural design is simple, and volume is little, and cost is low, goes for a variety of communication systems.
Accompanying drawing explanation
Fig. 1 is vertical view of the present invention.
Fig. 2 is upward view of the present invention.
Fig. 3 is whole effect structure chart of the present invention.
Fig. 4 is the scattering parameter test result figure of low pass filter of the present invention.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Of the present invention micro-to be with super wide stop-band low-pass filter be to be produced on the micro-band plate of double-sided copper-clad, uses the technology such as machinery is scribed, laser scoring, circuit board corrosion all can easily make.Core content of the present invention is to combine the super wide stop-band low-pass filter that various structures is designed a superior performance.
Shown in Figure 1, micro-described in the present embodiment be take the mode of printed circuit board (PCB) with super wide stop-band low-pass filter and is produced on dielectric constant as 2.55, on the thickness micro-band plate 1 of polytetrafluoroethylene double-sided copper-clad that is 0.8mm.On the same face of the micro-band plate of described double-sided copper-clad, be manufactured with respectively the input feeder line 2 for feed-in electromagnetic wave signal, for feeding out the output feeder line 13 of electromagnetic wave signal, the uniform impedance resonator of left and right mirror image symmetry, the Stepped Impedance resonator of upper and lower mirror image symmetry, connecting line (being specially high impedance connecting line), in the uniform impedance resonator of described left and right mirror image symmetry, all there is the uniform impedance resonator of a pair of upper and lower mirror image symmetry on every one side, and the uniform impedance resonator of described upper and lower mirror image symmetry interconnects, specifically as shown in Figure 1, the left side is provided with the uniform impedance resonator 3 of upper and lower mirror image symmetry, 4, the right is provided with the uniform impedance resonator 11 of upper and lower mirror image symmetry, 12, described uniform impedance resonator 3, 4, 11, 12 all fold bending, to reduce the volume of filter, all scabble its corner, to reduce the reflection of signal transmission.In the present embodiment, the Stepped Impedance resonator of described upper and lower mirror image symmetry has a pair of, two transmission lines that each Stepped Impedance resonator differs by width form, specifically as shown in Figure 1, the Stepped Impedance resonator of top is by transmission line 6, 7 form, following Stepped Impedance resonator is by transmission line 8, 9 form, and narrower transmission line 7 transmission line 8 narrower with following Stepped Impedance resonator of the Stepped Impedance resonator of top is connected, simultaneously, the wider transmission line 9 of the wider transmission line 6 of the Stepped Impedance resonator of top and following Stepped Impedance resonator all fold bending, to reduce the volume of filter, all scabble its corner, to reduce the reflection of signal transmission.In addition, input feeder line 2 described in the present embodiment is connected with the uniform impedance resonator on the left side 3,4, described output feeder line 13 is connected with the uniform impedance resonator on the right 11,12, described input feeder line 2 and output feeder line 13 are the matched impedance of 50 ohm, simultaneously, the uniform impedance resonator 3,4 on the described left side connects the transmission line 7,8 of the Stepped Impedance resonator of upper and lower mirror image symmetry by connecting line 5, the uniform impedance resonator 11,12 on described the right connects the transmission line 7,8 of the Stepped Impedance resonator of upper and lower mirror image symmetry by connecting line 10.
Shown in Figure 2, described in the present embodiment, on the another side of the micro-band plate 1 of double-sided copper-clad, be manufactured with the defect ground structure 14,15,16,17 that four integral body are dumbbell shaped, as we know from the figure, the shape size of this defect ground structure 14,15 is identical, the shape size of this defect ground structure 16,17 is identical, and defect ground structure 16,17 correspondences are located between defect ground structure 14,15.
Shown in Figure 3, fully shown micro-total effect with super wide stop-band low-pass filter of the present invention.
Shown in Figure 4, shown this micro-scattering parameter test result with super wide resistance low pass filter, wherein, transverse axis represents the signal frequency of low pass filter of the present invention, the longitudinal axis represents amplitude, comprises insertion loss (S
21) amplitude and return loss (S
11) amplitude, S
21represent by the input power of signal of low pass filter of the present invention and the relation between the power output of signal, its corresponding mathematical function is: power output/input power (dB)=20*log|S
21|.In the signals transmission of low pass filter of the present invention, the Partial Power of signal is reflected back toward signal source, and the power being reflected becomes reflection power.S
11represent that its corresponding mathematical function is as follows: reflection power/incident power==20*log|S by the input power of signal of four frequency filters and the relation between the reflection power of signal in the present invention
11|.
As we know from the figure, this low pass filter-3dB cut-off frequency is 1.2GHz, and logical in-band insertion loss absolute value is lower than 0.3dB, and return loss absolute value is greater than 17dB, and-20dB stopband suppresses from 1.57GHz, the highest 30GHz that surpasses.From insertion loss, return loss, selectivity and resistance band aspect, all there is outstanding performance, especially aspect resistance band.
In the situation that guaranteeing that cut-off frequency is constant, regulate uniform impedance resonator 3, 4, 11, the impedance ratio of 12 length and upper and lower Stepped Impedance resonator and the position that length can change transmission zero, simultaneously by the introducing of defect ground structure, increase on the one hand the impedance that connects transmission line, overcome and because impedance is too high, cause the narrow and unmanageable difficulty of transmission line, introduce on the other hand two extra transmission zeros (a kind of shape size produces), by all transmission zeros of arranged rational, coordinate simulation optimization, can greatly expand the stopband of filter.
The examples of implementation of the above are only the present invention's preferred embodiment, not with this, limit practical range of the present invention, therefore the variation that all shapes according to the present invention, principle are done all should be encompassed in protection scope of the present invention.
Claims (10)
1. be micro-ly with super wide stop-band low-pass filter for one kind, comprise the micro-band plate of double-sided copper-clad, it is characterized in that: on the same face of the micro-band plate of described double-sided copper-clad, be manufactured with respectively input feeder line (2) for feed-in electromagnetic wave signal, for feeding out relative uniform impedance resonator, Stepped Impedance resonator opposing upper and lower, the connecting line in output feeder line (13), left and right of electromagnetic wave signal, on the another side of the micro-band plate of described double-sided copper-clad, be manufactured with defect ground structure; Wherein, described Stepped Impedance resonator opposing upper and lower interconnects, and corresponding being located between the relative uniform impedance resonator in left and right, the relative uniform impedance resonator in described left and right is connected with described Stepped Impedance resonator opposing upper and lower by corresponding connecting line separately respectively, and described input feeder line (2) is connected with corresponding uniform impedance resonator respectively with output feeder line (13).
2. a kind of micro-super wide stop-band low-pass filter of being with according to claim 1, is characterized in that: described input feeder line (2) and output feeder line (13) are the matched impedance of 50 ohm.
3. a kind of micro-super wide stop-band low-pass filter of being with according to claim 1, it is characterized in that: in the relative uniform impedance resonator in described left and right, every one side has a pair of uniform impedance resonator opposing upper and lower at least, and described uniform impedance resonator opposing upper and lower interconnects.
4. a kind of micro-super wide stop-band low-pass filter of being with according to claim 1, it is characterized in that: two transmission lines that each Stepped Impedance resonator differs by width form, and described Stepped Impedance resonator opposing upper and lower connects by close separately transmission line, the relative uniform impedance resonator in described left and right is connected with the transmission line that described Stepped Impedance resonator leans on mutually by connecting line.
5. a kind of micro-super wide stop-band low-pass filter of being with according to claim 1, is characterized in that: described Stepped Impedance resonator opposing upper and lower has at least a pair of.
6. a kind of micro-super wide stop-band low-pass filter of being with according to claim 1, is characterized in that: described defect ground structure be shaped as dumbbell shaped.
7. according to a kind of micro-described in claim 1 or 3, be with super wide stop-band low-pass filter, it is characterized in that: the relative uniform impedance resonator in described left and right all folds crooked, and all scabble corner.
8. a kind of micro-super wide stop-band low-pass filter of being with according to claim 4, is characterized in that: in each Stepped Impedance resonator, wider transmission line all folds bending, and all scabble corner.
9. a kind of micro-super wide stop-band low-pass filter of being with according to claim 1, is characterized in that: the uniform impedance resonator mirror picture symmetry that described left and right is relative, described Stepped Impedance resonator mirror picture opposing upper and lower is symmetrical.
10. a kind of micro-super wide stop-band low-pass filter of being with according to claim 3, is characterized in that: described uniform impedance resonator mirror picture opposing upper and lower is symmetrical.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490036A (en) * | 2016-01-07 | 2016-04-13 | 华南理工大学 | Series-feed and shunt-feed combination filtering microstrip array antenna |
| CN105742124A (en) * | 2016-05-03 | 2016-07-06 | 北京邮电大学 | Microelectromechanical system switch |
| CN105896005A (en) * | 2016-04-28 | 2016-08-24 | 湖北大学 | Small-size low-loss wide-stop-band sharp cut-off microstrip low-pass filter |
| CN109216838A (en) * | 2018-09-18 | 2019-01-15 | 贵州大学 | Improved defect ground structure low-pass filter |
| CN109244614A (en) * | 2018-08-30 | 2019-01-18 | 南京理工大学 | A kind of harmonics restraint ultra-wide band filter based on DGS structure |
| CN109713409A (en) * | 2019-01-30 | 2019-05-03 | 华南理工大学 | A kind of three band Planer filters based on multimode resonator |
| WO2021164198A1 (en) * | 2020-02-19 | 2021-08-26 | 中天通信技术有限公司 | Microstrip low-pass filter |
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| CN101662057A (en) * | 2009-09-23 | 2010-03-03 | 东南大学 | Compact micro-band resonant unit low-pass filter with low insertion loss and wide stopband |
| CN102361110A (en) * | 2011-10-08 | 2012-02-22 | 上海大学 | Small-sized double-module double-frequency micro-strip filter |
| CN203644911U (en) * | 2013-11-19 | 2014-06-11 | 华南理工大学 | Micro-strip super-wide stop-band low-pass filter |
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2013
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| CN101662057A (en) * | 2009-09-23 | 2010-03-03 | 东南大学 | Compact micro-band resonant unit low-pass filter with low insertion loss and wide stopband |
| CN102361110A (en) * | 2011-10-08 | 2012-02-22 | 上海大学 | Small-sized double-module double-frequency micro-strip filter |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490036A (en) * | 2016-01-07 | 2016-04-13 | 华南理工大学 | Series-feed and shunt-feed combination filtering microstrip array antenna |
| CN105490036B (en) * | 2016-01-07 | 2018-06-22 | 华南理工大学 | Filtering micro-strip array antenna that is a kind of series feed and presenting combination |
| CN105896005A (en) * | 2016-04-28 | 2016-08-24 | 湖北大学 | Small-size low-loss wide-stop-band sharp cut-off microstrip low-pass filter |
| CN105742124A (en) * | 2016-05-03 | 2016-07-06 | 北京邮电大学 | Microelectromechanical system switch |
| CN109244614A (en) * | 2018-08-30 | 2019-01-18 | 南京理工大学 | A kind of harmonics restraint ultra-wide band filter based on DGS structure |
| CN109244614B (en) * | 2018-08-30 | 2021-03-02 | 南京理工大学 | Harmonic suppression ultra-wideband filter based on DGS structure |
| CN109216838A (en) * | 2018-09-18 | 2019-01-15 | 贵州大学 | Improved defect ground structure low-pass filter |
| CN109713409A (en) * | 2019-01-30 | 2019-05-03 | 华南理工大学 | A kind of three band Planer filters based on multimode resonator |
| CN109713409B (en) * | 2019-01-30 | 2023-11-03 | 华南理工大学 | Three-frequency-band plane filter based on multimode resonator |
| WO2021164198A1 (en) * | 2020-02-19 | 2021-08-26 | 中天通信技术有限公司 | Microstrip low-pass filter |
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Application publication date: 20140312 |