CN203644911U - Micro-strip super-wide stop-band low-pass filter - Google Patents
Micro-strip super-wide stop-band low-pass filter Download PDFInfo
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- CN203644911U CN203644911U CN201320733200.9U CN201320733200U CN203644911U CN 203644911 U CN203644911 U CN 203644911U CN 201320733200 U CN201320733200 U CN 201320733200U CN 203644911 U CN203644911 U CN 203644911U
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- impedance resonator
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- pass filter
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- wide stop
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Abstract
The utility model discloses a micro-strip super-wide stop-band low-pass filter, and the filter comprises a double-face copper-coating micro-strip plate. One surface of the double-face copper-coating micro-strip plate is provided with an input end feeder line, an output end feeder line, uniform impedance resonators which are respectively located at left and right sides and opposite to each other, step-change impedance resonators which are respectively located at upper and lower sides and opposite to each other, and connecting lines. The other surface of the double-face copper-coating micro-strip plate is provided with a defective structure. The step-change impedance resonators are connected with each other, and disposed between the uniform impedance resonators. The uniform impedance resonators are respectively connected with the step-change impedance resonators through the corresponding connecting line. The input and output feeder lines are respectively connected with the corresponding uniform impedance resonator. The filter provided by the utility model is simple and reliable in structure, is good in selectivity, is low in loss, is high in roll-off, is small in size, is low in cost, and is super-wide in stop band.
Description
Technical field
The utility model relates to the technical field of high frequency assembly, refers 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 higher than the intransitable filter of signal of 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, but 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 transmission zero can to produce the effect of low pass filter.But above various measures are still not good enough for representing in super wide stopband and smaller size smaller aspect.
Summary of the invention
The purpose of this utility model 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 utility model 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 for the input feeder line of 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 passes through respectively corresponding connecting line separately and is connected with described Stepped Impedance resonator opposing upper and lower, 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, 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.
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, and 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 bending, 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 symmetry opposing upper and lower.
Described uniform impedance resonator mirror picture symmetry opposing upper and lower.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
1, in conjunction with uniform impedance resonator, Stepped Impedance resonator, the three kinds of multiple transmission zeros of structure generation in defect ground, greatly expand the bandwidth of rejection of low pass filter, represent super wide stopband character;
2, in 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 utility model.
Fig. 2 is upward view of the present utility model.
Fig. 3 is whole effect structure chart of the present utility model.
Fig. 4 is the scattering parameter test result figure of low pass filter of the present utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model is described in further detail.
Described in the utility model 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 utility model is to combine various structures designs the super wide stop-band low-pass filter of a superior performance.
Shown in Figure 1, described in the present embodiment micro-with super wide stop-band low-pass filter take the mode of printed circuit board (PCB) be produced on dielectric constant as 2.55, thickness is on the micro-band plate 1 of polytetrafluoroethylene double-sided copper-clad of 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 compositions, following Stepped Impedance resonator is by transmission line 8, 9 compositions, 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 entirety 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 show micro-total effect with super wide stop-band low-pass filter of the present utility model.
Shown in Figure 4, show 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 utility model, the longitudinal axis represents amplitude, comprises insertion loss (S
21) amplitude and return loss (S
11) amplitude, S
21represent by the relation between the input power of signal and the power output of signal of low pass filter of the present utility model, 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 utility model, 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 relation between the input power of signal and the reflection power of signal of four frequency filters in the utility model
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 exceedes.All there is outstanding performance from insertion loss, return loss, selectivity and resistance band aspect, 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 length can change the position of transmission zero, simultaneously by the introducing of defect ground structure, increase on the one hand the impedance that connects transmission line, overcome and cause the narrow and unmanageable difficulty of transmission line because impedance is too high, 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 preferred embodiment of the utility model, not limit practical range of the present utility model with this, therefore the variation that all shapes according to the utility model, principle are done all should be encompassed in protection range of the present utility model.
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 for the input feeder line (2) of 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 passes through respectively corresponding connecting line separately and is connected with described Stepped Impedance resonator opposing upper and lower, and described input feeder line (2) is connected with corresponding uniform impedance resonator respectively with output feeder line (13).
2. one according to claim 1 is micro-is with super wide stop-band low-pass filter, it is characterized in that: described input feeder line (2) and output feeder line (13) are the matched impedance of 50 ohm.
3. one according to claim 1 is micro-is with super wide stop-band low-pass filter, 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. one according to claim 1 is micro-is with super wide stop-band low-pass filter, 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, and 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. one according to claim 1 is micro-is with super wide stop-band low-pass filter, it is characterized in that: described Stepped Impedance resonator opposing upper and lower has at least a pair of.
6. one according to claim 1 is micro-is with super wide stop-band low-pass filter, it is characterized in that: described defect ground structure be shaped as dumbbell shaped.
7. be with super wide stop-band low-pass filter according to the one described in claim 1 or 3 is micro-, it is characterized in that: the relative uniform impedance resonator in described left and right all folds bending, and all scabble corner.
8. one according to claim 4 is micro-is with super wide stop-band low-pass filter, it is characterized in that: in each Stepped Impedance resonator, wider transmission line all folds bendingly, and all scabble corner.
9. one according to claim 1 is micro-is with super wide stop-band low-pass filter, it is characterized in that: the uniform impedance resonator mirror picture symmetry that described left and right is relative, described Stepped Impedance resonator mirror picture symmetry opposing upper and lower.
10. one according to claim 3 is micro-is with super wide stop-band low-pass filter, it is characterized in that: described uniform impedance resonator mirror picture symmetry opposing upper and lower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320733200.9U CN203644911U (en) | 2013-11-19 | 2013-11-19 | Micro-strip super-wide stop-band low-pass filter |
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| CN201320733200.9U CN203644911U (en) | 2013-11-19 | 2013-11-19 | Micro-strip super-wide stop-band low-pass filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633399A (en) * | 2013-11-19 | 2014-03-12 | 华南理工大学 | Microstrip ultra wide stop band low pass filter |
| CN113381143A (en) * | 2021-06-03 | 2021-09-10 | 南京工程学院 | Microstrip low-pass filter and transmission zero determination and frequency setting method |
-
2013
- 2013-11-19 CN CN201320733200.9U patent/CN203644911U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633399A (en) * | 2013-11-19 | 2014-03-12 | 华南理工大学 | Microstrip ultra wide stop band low pass filter |
| CN113381143A (en) * | 2021-06-03 | 2021-09-10 | 南京工程学院 | Microstrip low-pass filter and transmission zero determination and frequency setting method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140611 Termination date: 20161119 |