CN103560309A - Sine windowing electromagnetism band gap band-stop filter - Google Patents
Sine windowing electromagnetism band gap band-stop filter Download PDFInfo
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- CN103560309A CN103560309A CN201310478539.3A CN201310478539A CN103560309A CN 103560309 A CN103560309 A CN 103560309A CN 201310478539 A CN201310478539 A CN 201310478539A CN 103560309 A CN103560309 A CN 103560309A
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- microstrip line
- stop filter
- weighting
- band stop
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Abstract
The invention discloses a sine windowing electromagnetism band gap band-stop filter which comprises an upper-layer microstrip line structure, a middle-layer medium substrate and a lower-layer grounding metal face. The upper-layer microstrip line structure is attached to the upper surface of the middle medium substrate and the grounding metal face is attached to the lower surface of the middle medium substrate. The upper-layer microstrip line structure comprises an input port, an output port and a periodical microstrip line which is modulated by a windowing function, wherein the input port and the output port are formed in the two ends of the upper-layer microstrip line structure. The weighting technology with a grounded flaw face is directly applied to microstrip transmission line design of the one-dimension sine EBG band-stop filter. A signal is weighted through a window function, thus, truncation errors generated when limited truncation is carried out on an infinite time-domain signal are reduced. Thus, under the condition that performances of the device are not changed, the device can be miniaturized through a small sine periodical amount. Passband ripples and reflected sidelobe performances of the band-stop filter are improved, thus, the manufacturing technology of the sine windowing electromagnetism band gap band-stop filter is simpler.
Description
Technical field
The present invention relates to a kind of sinusoidal windowing type electro-magnetic bandgap band stop filter.
Background technology
Filter is very extensive in the communication system especially use in the middle of wireless communication system, can realize the functions such as image cancellation, harmonic wave inhibition and channel selection, to guarantee communication quality, has very consequence in communication system.Wherein band stop filter is a kind of signal suppressing in a certain frequency range, and the filter that allows signal beyond frequency range pass through.Can be used for suppressing in wireless communication system the scattering frequency spectrum of high power transmitter and nonlinear power amplifier etc. and the parasitic passband of band pass filter etc.
Electromagnetic bandgap structure (Electromagnetic Band Gap, EBG) be a kind of periodic structure that has obvious forbidden band characteristic, can make the electromagnetic wave of some frequency range therefrom pass through, can suppress to be coupled between the road of circuit, improve the Q value of resonator, make the microwave devices such as low pass filter, power splitter, can also be used to suppressing antenna secondary lobe, improve antenna gain and bandwidth etc.
The band stop filter that utilizes electromagnetic bandgap structure to make, has passband ripple larger, and the higher shortcoming of reflection secondary lobe, is unfavorable for electromagnetic transmission in passband.Sinusoidal pattern electro-magnetic bandgap band stop filter is the electromagnetic bandgap structure microstrip filter that a kind of microstrip line live width changes sinusoidally, in order to improve the filtering performance of sinusoidal pattern electro-magnetic bandgap band stop filter, need to suppress passband ripple and reflection secondary lobe.
Summary of the invention
The object of the invention is to provide a kind of sinusoidal windowing type electro-magnetic bandgap band stop filter, and the present invention has improved passband ripple and the reflection side lobe performance of band stop filter, and manufacture craft is also simpler.
In order to solve these problems of the prior art, technical scheme provided by the invention is:
A kind of sinusoidal windowing type electro-magnetic bandgap band stop filter, filter comprises the grounding metal plane of the microstrip line construction on upper strata, the medium substrate in intermediate layer and lower floor, upper strata microstrip line construction is attached to intermediate medium plate upper surface, grounding metal plane is attached to intermediate medium plate lower surface, the periodicity microstrip line that the microstrip line construction on upper strata is included in the input port at two ends, output port and modulates through windowed function.
For technique scheme, inventor also has further optimization embodiment.
As optimization, described periodicity microstrip line is the microstrip line unit of n the sinusoidal pattern periodic structure through windowed function modulation.
Further, input, output port adopt 50 ohm of couplings, and each microstrip line cell-average characteristic impedance is also 50 ohm.
As optimization, in the microstrip line construction of described upper strata, by windowed function, realize the modulation to the coupling coefficient of each microstrip line unit, make the coupling coefficient of each the microstrip line unit in microstrip line periodically all meet the distribution of windowed function.
Further, described windowed function is modulated the weighting that is modulated to of each microstrip line unit, and described weighting modulation comprises Gaussian window weighting, the weighting of hamming window, Hanning window weighting and Blackman window weighting.
Further, the coupling coefficient An that realizes each microstrip line unit after weighting modulation is:
Gaussian window weighting: A
n=R
maxexp (2 (2x
n)
2) A;
Hamming window weighting: A
n=R
max(0.54+0.46cos (2 π x
n)) A;
Hanning window weighting: A
n=R
max(0.5 (1+cos (2 π x
n))) A;
Blackman window weighting: A
n=R
max(0.42+0.5cos (2 π x
n)+0.08cos (4 π x
n)) A
Wherein: the microstrip line unit that n is n cycle; Xn is the normalization x coordinate figure that the microstrip line unit center in n cycle is corresponding; Rmax is weighting coupling multiple.
With respect to scheme of the prior art, advantage of the present invention is:
The present invention describes a kind of sinusoidal windowing type electro-magnetic bandgap band stop filter, for one dimension band gap band stop filter structure, this filter is directly used in the weighting technique of defect face ground connection in the microstrip transmission line design of the sinusoidal EBG band stop filter of one dimension, by window function, signal is weighted, (window adding technology is that during signal is processed, a kind of window function that utilizes reduces the technology that spectrum energy leaks), the truncated error when reducing infinite horizon signal to carry out limited blocking.In the situation that guaranteeing that device performance is constant, accomplish the miniaturization of device size like this, can realize by less sinusoidal pattern number of cycles.The present invention utilizes window adding technology to improve the frequency domain response of signal, for improving passband ripple and the reflection side lobe performance of band stop filter, makes the manufacture craft of such filter also simpler.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the model of sinusoidal pattern electro-magnetic bandgap band stop filter;
Fig. 2 is simulation result and the experimental result of sinusoidal pattern electro-magnetic bandgap band stop filter S parameter, and left figure is S
11parameter, right figure is S
21parameter;
Fig. 3 is that sinusoidal pattern electro-magnetic bandgap band stop filter is through the schematic diagram of window function weighting modulation;
Fig. 4 is S parameters simulation result and the experimental result comparison diagram of the sinusoidal windowing type electro-magnetic bandgap band stop filter after Gauss function weighting modulation, and left figure is S
11parameter, right figure is S
21parameter;
Fig. 5 is the comparison diagram of the electro-magnetic bandgap band stop filter S Experiment Parameter result before and after Gauss function modulation, and left figure is S
11parameter, right figure is S
21parameter.
Embodiment
Below in conjunction with specific embodiment, such scheme is described further.Should be understood that these embodiment are not limited to limit the scope of the invention for the present invention is described.The implementation condition adopting in embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in normal experiment.
Embodiment:
The present embodiment has been described a kind of sinusoidal windowing type electro-magnetic bandgap band stop filter, filter comprises the grounding metal plane of the microstrip line construction on upper strata, the medium substrate in intermediate layer and lower floor, upper strata microstrip line construction is attached to intermediate medium plate upper surface, grounding metal plane is attached to intermediate medium plate lower surface, the periodicity microstrip line that the microstrip line construction on upper strata is included in the input port at two ends, output port and modulates through windowed function.Described periodicity microstrip line is the microstrip line unit of 5 sinusoidal pattern periodic structures through windowed function modulation.
The media substrate that the present embodiment medium substrate adopts is dielectric constant 3.5, dielectric substrate thickness 1.5mm, and micro belt conductor and periodically microstrip line are the copper-clad plate of thickness 35 μ m, the centre frequency 3.6GHz of filter, periodic unit number is 5, Bandgap depth 32dB.Be equally applicable to other different media substrate parameters, and different centre frequencies, periodic unit number and Bandgap depth.Input, output port adopt 50 ohm of couplings, and each microstrip line cell-average characteristic impedance is also 50 ohm.
The present embodiment, in the microstrip line construction of described upper strata, is realized the modulation to the coupling coefficient of each microstrip line unit by Gauss function, makes the coupling coefficient of each the microstrip line unit in microstrip line periodically all meet the distribution of windowed function.
The sinusoidal pattern electro-magnetic bandgap band stop filter that the periodic unit number that shown in Fig. 1 is microstrip line unit is 5, the cyclic variation by microstrip line realizes electro-magnetic bandgap characteristic, and the two ends of device extend to port by the microstrip line of 50 Ω couplings.Figure middle port 1 is input, and port 2 is output.The average characteristics impedance of the microstrip line of each periodic unit is 50 Ω, and wherein the widest part Wmax of microstrip line is 7.5mm, and the narrowest Wmin of place is 1.2mm, and each element length is 25mm.
Fig. 2 is the S parameter of the 5 unit sinusoidal pattern electro-magnetic bandgap band stop filters that obtain through analogue simulation and experiment measuring.As can be seen from Figure 2, near the reflection secondary lobe of passband forbidden band is higher, be about-3dB of the first secondary lobe wherein, and passband ripple is larger, is about-5dB.Experimental measurements and simulation results show good consistency.
Fig. 3 is that sinusoidal pattern electro-magnetic bandgap band stop filter is through the schematic diagram of window function weighting modulation, filter after being weighted with window function, the sinusoidal unit maximum line width of adjacent periods, no longer equal, but present the gradual change rule reducing gradually from the middle to both ends.And for different sinusoidal unit, the live width maximum of microstrip line is larger, its minimum value is also less, and the microstrip line average characteristics impedance of each unit is still 50 Ω.
Fig. 4 is S parameters simulation result and the experimental result contrast of the sinusoidal windowing type electro-magnetic bandgap band stop filter after Gauss function weighting modulation.Known by contrasting, simulation results and experimental measurements consistency are good, and as can be seen from the figure, S11 reflection secondary lobe is lower, and S21 passband ripple is less.
Fig. 5 is the comparison diagram of the electro-magnetic bandgap band stop filter S Experiment Parameter result before and after Gauss function modulation.By contrast, can find, the electro-magnetic bandgap band stop filter after window function weighting modulation, bandwidth has obtained broadening, and Bandgap depth slightly increases, and reflection secondary lobe and passband ripple have obtained obvious inhibition.The bandwidth of the filter after weighting modulation has been compared original sinusoidal pattern electro-magnetic bandgap band stop filter broadening approximately 37.7%, Bandgap depth increases about 1dB, the first reflection secondary lobe amplitude is by drop to-23dB of original-3dB, the drop to approximately-0.2dB of have-2dB of passband ripple of forbidden band low frequency one side, the passband ripple of forbidden band high frequency one side, at 6GHz with interior by-dropped to approximately-2dB of 5dB.
The simulation result of above embodiment and experimental result have all been verified validity of the present invention.Band stop filter bandwidth after window function weighting modulation has obtained broadening, and reflection secondary lobe and passband ripple have all obtained inhibition, and the performance of filter has obtained very large improvement.Above embodiment provides as example, for the sinusoidal windowing type electro-magnetic bandgap band stop filter of realizing for design objectives such as different medium plate substrate parameter and centre frequencies that adopts identical window adding technology to implement, within obviously should being contained in the scope of the claims of the present invention.
Above-mentioned example is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations that Spirit Essence is done according to the present invention or modification, within all should being encompassed in protection scope of the present invention.
Claims (6)
1. a sinusoidal windowing type electro-magnetic bandgap band stop filter, it is characterized in that, filter comprises the grounding metal plane of the microstrip line construction on upper strata, the medium substrate in intermediate layer and lower floor, upper strata microstrip line construction is attached to intermediate medium plate upper surface, grounding metal plane is attached to intermediate medium plate lower surface, the periodicity microstrip line that the microstrip line construction on upper strata is included in the input port at two ends, output port and modulates through windowed function.
2. sinusoidal windowing type electro-magnetic bandgap band stop filter according to claim 1, is characterized in that, described periodicity microstrip line is the microstrip line unit of n the sinusoidal pattern periodic structure through windowed function modulation.
3. sinusoidal windowing type electro-magnetic bandgap band stop filter according to claim 1 and 2, is characterized in that, input, output port adopt 50 ohm of couplings, and each microstrip line cell-average characteristic impedance is also 50 ohm.
4. sinusoidal windowing type electro-magnetic bandgap band stop filter according to claim 2, it is characterized in that, in the microstrip line construction of described upper strata, by windowed function, realize the modulation to the coupling coefficient of each microstrip line unit, make the coupling coefficient of each the microstrip line unit in microstrip line periodically all meet the distribution of windowed function.
5. sinusoidal windowing type electro-magnetic bandgap band stop filter according to claim 4, it is characterized in that, described windowed function is modulated the weighting that is modulated to of each microstrip line unit, and described weighting modulation comprises Gaussian window weighting, the weighting of hamming window, Hanning window weighting and Blackman window weighting.
6. sinusoidal windowing type electro-magnetic bandgap band stop filter according to claim 5, is characterized in that, the coupling coefficient An that realizes each microstrip line unit after weighting modulation is:
Gaussian window weighting: A
n=R
maxexp (2 (2x
n)
2) A;
Hamming window weighting: A
n=R
max(0.54+0.46cos (2 π x
n)) A;
Hanning window weighting: A
n=R
max(0.5 (1+cos (2 π x
n))) A;
Blackman window weighting: A
n=R
max(0.42+0.5cos (2 π x
n)+0.08cos (4 π x
n)) A
Wherein:
N is n periodic unit; Xn is n the normalization x coordinate figure that periodic unit center is corresponding; Rmax is weighting coupling multiple.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1750319A (en) * | 2005-08-31 | 2006-03-22 | 同济大学 | A kind of photonic crystal microstrip line with little band closed circuit |
| EP1906484A1 (en) * | 2006-09-28 | 2008-04-02 | Selex Communications S.P.A. | Distributed capacitive component in strip lines, filter, transformer, resonator and divider arrangements |
| CN101165965A (en) * | 2006-10-05 | 2008-04-23 | 株式会社藤仓 | Reflection-type bandpass filter |
-
2013
- 2013-10-14 CN CN201310478539.3A patent/CN103560309A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1750319A (en) * | 2005-08-31 | 2006-03-22 | 同济大学 | A kind of photonic crystal microstrip line with little band closed circuit |
| EP1906484A1 (en) * | 2006-09-28 | 2008-04-02 | Selex Communications S.P.A. | Distributed capacitive component in strip lines, filter, transformer, resonator and divider arrangements |
| CN101165965A (en) * | 2006-10-05 | 2008-04-23 | 株式会社藤仓 | Reflection-type bandpass filter |
Non-Patent Citations (3)
| Title |
|---|
| DUSAN NESIC等: "BANDSTOP MICROSTRIP PBG FILTER", 《MICROWAVE AND OPTICAL TECHNOLOGY LETTERS》, vol. 29, no. 6, 20 June 2001 (2001-06-20) * |
| M.LE ROY等: "A New Design of Microwave Filters by Using Continuously Varying", 《MICROWAVE SYMPOSIUM DIGEST, 1997., IEEE MTT-S INTERNATIONAL》, vol. 2, 13 June 1997 (1997-06-13) * |
| 闫敦豹等: "加窗技术在微带EBG结构中的应用", 《微波学报》, vol. 20, no. 4, 31 December 2004 (2004-12-31) * |
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Application publication date: 20140205 |