CN103151588B - A kind of miniaturized ultra-wide stopband microwave microstrip broadband band pass filter - Google Patents
A kind of miniaturized ultra-wide stopband microwave microstrip broadband band pass filter Download PDFInfo
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- CN103151588B CN103151588B CN201310060716.6A CN201310060716A CN103151588B CN 103151588 B CN103151588 B CN 103151588B CN 201310060716 A CN201310060716 A CN 201310060716A CN 103151588 B CN103151588 B CN 103151588B
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Abstract
The present invention relates to a kind of miniaturized ultra-wide stopband microwave microstrip broadband band pass filter, it is characterized in that comprising SMA connector, medium substrate, 50 ohm of feeder lines, high resistant line, ground connection high resistant line, fan-shaped minor matters line and stepped impedance lines; The central point of high resistant line is provided with a pair fan-shaped minor matters line, and is connected with 50 ohm of feeder lines with the probe that terminal A 1 and the A2 at the upper and lower symmetrical high resistant line two ends of the horizontal center line of high resistant line are connected on 50 ohm of feeder line 4, SMA connectors respectively; Also be connected stepped impedance line in the terminal A 1 at high resistant line two ends respectively with A2 place, also connect ground connection high resistant line respectively; The other end of described ground connection high resistant line is provided with ground connection via hole.The one that the present invention proposes miniaturized ultra-wide stopband microwave microstrip broadband band pass filter, the size of filter is little, to secondary until ten quintuple harmonicss have 20dB harmonic restraining function, has broadband passband.Requirement on machining accuracy of the present invention is low, realizes simple, low cost, convenient for production.
Description
Technical field
The invention belongs to filter, particularly relate to a kind of miniaturized ultra-wide stopband microwave microstrip broadband band pass filter.
Background technology
Microwave filter is one of element the most frequently used in microwave technical field, for lower loss transmission useful signal and at the unwanted noise signal of stopband attenuation and noise etc.Microstrip circuit because volume is little, lightweight, complanation and be easy to the advantage such as integrated, be therefore widely used.Modern high data rate communication systems needs broad passband element to realize.In addition, in order to improve the service behaviour of whole system further, also need Wide stop bands even ultra-wide stopband to suppress the impact of high order harmonic component radio frequency front end.General microwave microstrip filter is difficult to obtain broad passband bandwidth and Wide stop bands performance simultaneously.When adopting traditional coupling line mode to realize broadband character, often need close coupling effect, this just needs extremely narrow coupling gap, therefore not easily processes.In order to reduce the requirement of pole narrow slot, can grounding metal plane etching defect ground structure below coupling line.Although this method can reduce the requirement of processing technology, the ground plane having etched circuit is unfavorable for the integrated of whole filter and system.In addition, in order to widen the bandwidth of rejection of filter, often or outside cascaded lowpass inner in bandpass filter structures or band resistance structure.Although this method can improve bandwidth of rejection and the belt resistance inhibitor system of band pass filter, new band pass filter bears loss and the circuit size of two or more structures, and therefore filter insertion loss and circuit size are often larger.When adopting multimode resonator method design microstrip broadband band pass filter, its bandwidth of rejection is also limited to the parasitic passband that higher order resonances mould produces, and cascaded lowpass or band resistance structure thus also must be adopted to improve the Stopband Performance of band pass filter.Traditional cascaded lowpass-high pass method is the another kind of method of design microstrip broadband band pass filter, because the low pass behavior of low pass filter, therefore the band pass filter of this kind of structure can have wider stopband.But this structure subjects insertion loss and the circuit size summation of low pass filter used and high pass filter.
Summary of the invention
The technical problem solved
In order to avoid the deficiencies in the prior art part, the present invention proposes a kind of miniaturized ultra-wide stopband microwave microstrip broadband band pass filter, is the miniaturized ultra-wide stopband microwave microstrip broadband band pass filter being applicable to high data rate communication systems radio-frequency front-end.
Technical scheme
A kind of miniaturized ultra-wide stopband microwave microstrip broadband band pass filter, is characterized in that comprising SMA connector 2,50 ohm of feeder lines 4, high resistant line 5, ground connection high resistant line 6, fan-shaped minor matters line 8 and stepped impedance line 9; The central point of high resistant line 5 is provided with a pair fan-shaped minor matters line 8, and is connected with 50 ohm of feeder lines 4 with the probe that terminal A 1 and the A2 at upper and lower symmetrical high resistant line 5 two ends of the horizontal center line of high resistant line are connected on 50 ohm of feeder line 4, SMA connectors 2 respectively; Also be connected stepped impedance line 9 in the terminal A 1 at high resistant line 5 two ends respectively with A2 place, also connect ground connection high resistant line 6 respectively; The other end of described ground connection high resistant line 6 is provided with ground connection via hole 7.
Described SMA connector 2,50 ohm of feeder lines 4, high resistant line 5, ground connection high resistant line 6, fan-shaped minor matters line 8 and stepped impedance line 9 are fixed on medium substrate 3.
Described stepped impedance line 9 comprises high impedance section and Low ESR part, and what be connected with terminal A 1 and A2 is high impedance section, then connects Low ESR part.
The frequency of the described length of stepped impedance line 9 and the transmission zero of its introducing is inversely proportional to.
By regulating the length ratio of stepped impedance line 9 high impedance section and Low ESR part and width than the position of carrying out adjustment transmission zero and high order transmission zero.
Radius or the radian of described fan-shaped minor matters line 8 are directly proportional to lumped capacity value.
Described high resistant line 5 length is directly proportional to lumped inductance value.
The frequency of the described length of ground connection high resistant line 6 and the transmission zero of its introducing is inversely proportional to.
Described stepped impedance line 9 is folded into serpentine shape.
Described ground connection high resistant line 6 is folded into serpentine shape.
Beneficial effect
The one that the present invention proposes miniaturized ultra-wide stopband microwave microstrip broadband band pass filter, the size of filter is little, to secondary until ten quintuple harmonicss have 20dB harmonic restraining function, has broadband passband.Requirement on machining accuracy of the present invention is low, realizes simple, low cost, convenient for production.Compared with prior art, its advantage and beneficial effect are in the present invention:
1, the passband of filter can realize the relative bandwidth being greater than 80%;
2, filter stop bend can to secondary until the frequency within ten quintuple harmonicss has the harmonic suppression effect being better than 20dB;
3, the size of whole filter is little, insertion loss is little.
Accompanying drawing explanation
Fig. 1: the present invention's miniaturized ultra-wide stopband microwave microstrip broadband bandpass filter structures schematic diagram;
Fig. 2: the typical frequencies response of the embodiment of the present invention;
1-metallic cavity, 2-SMA connector, 3-medium substrate, 4-50 ohm feeder line, 5-high resistant line, 6-ground connection high resistant line, 7-ground connection via hole, the fan-shaped minor matters line of 8-, 9-stepped impedance line, one end of A1-high resistant line 5, one end of A2-high resistant line 5.
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
With reference to accompanying drawing, metallic cavity 1 is for medium substrate 3 provides installation carrier.Because the standard feature impedance of present radio-frequency front-end system is 50 ohm, therefore the present invention adopts the input/output port that 50 ohm of feeder lines 4 are connected to the ends A 1 of high resistant line 5, A2 point proposes structure as the present invention.Probe on SMA connector 2 directly contacts with 50 ohm of feeder lines 4, and signal inputs from one of them the SMA connector 2 metallic cavity, exports from another SMA connector metallic cavity.Signal carries out the transmission of accurate TEM mould in the circuit layer of medium substrate upper surface.A pair fan-shaped minor matters line 8 is positioned at the centre of high resistant line 5, and this pair fan-shaped minor matters line 8 is symmetrical, symmetrical about the vertical center line of high resistant line up and down about the horizontal center line of high resistant line.High resistant line 5 can be equivalent to a lumped inductance, and high resistant line 5 length is longer, the lumped inductance inductance value of the narrower gained of live width is larger; Fan-shaped minor matters line 8 can be equivalent to a lumped capacity, and fan-shaped minor matters line 8 radius lumped capacity capacitance that is larger, the larger gained of radian is larger.Therefore, the high resistant line 5 of this loading fan-shaped minor matters line 8 has low-pass characteristic.According to 3dB cut-off frequency and the low-pass filter response type of required low pass filter, can regulate by the radius of the length of adjustment high resistant line 5, width and fan-shaped minor matters line 8, radian and obtain required inductance capacitance value, thus the low-pass filter response that acquisition one is initial.In general, the 3dB cut-off frequency value of the low pass filter of larger, the larger gained of capacitance of inductance value is lower.But only adopt high resistant line 5 not precipitous with the transition band of the low pass filter of fan-shaped minor matters line 8, and high resistant line 5 has parasitic capacitance, fan-shaped minor matters line 8 has stray inductance, therefore the stopband of gained low pass filter has obvious parasitic passband.In order to improve the abruptness of filter lower sideband and expand filter stop bend bandwidth, a pair stepped impedance line 9 is added to two contact point A1, A2 places of high resistant line 5 and 50 ohm line 4.Consider the compact dimensions of total, stepped impedance line 9 is folded into serpentine shape.When the single port input impedance of the stepped impedance line 9 of entering viewed from A1, A2 point equals zero, stepped impedance line 9 provides multiple transmission zero with regard to the structure that can be the present invention's proposition.The frequency location of the transmission zero that stepped impedance line 9 is introduced determines primarily of the entire length of stepped impedance line 9, namely by length and the decision of stepped impedance line 9 high impedance section and Low ESR part.In general, the length of stepped impedance line 9 is longer, and the frequency of its transmission zero introduced is lower.In order to utilize its first transmission zero to improve low pass filter lower sideband abruptness and to utilize its high order transmission zero to suppress parasitic passband, can by regulating the length ratio of stepped impedance line 9 high impedance section and Low ESR part and width than the relative position regulating a transmission zero and high order transmission zero.In general, then stepped impedance line 9 high impedance section before this of entering viewed from A1, A2 point after adjustment is Low ESR part.High resistant line 5 described above, fan-shaped minor matters line 8 and stepped impedance line 9 can design that transition band is precipitous, the low pass filter of Wide stop bands.In order to obtain bandpass filtering response, the ground connection high resistant line 6 that wriggles for a pair is also added to two contact point A1, A2 places of high resistant line 5 and 50 ohm line 4.Consider the compactedness of total, ground connection high resistant line 6 is also folded into serpentine shape.Namely direct current signal and low frequency signal flow into ground by the ground connection via hole 7 of sinuous ground connection high resistant line 6, and the ground connection high resistant line 6 that namely wriggles has high pass characteristic, thus achieve the bandpass filtering response that the present invention proposes structure.When the sinuous ground connection high resistant line 6 single port input impedance of entering viewed from A1, A2 point equals zero, the structure that the ground connection high resistant line 6 that wriggles also can be the present invention's proposition provides multiple transmission zero.In general, the length of the ground connection high resistant line 6 that wriggles is longer, and the frequency of its transmission zero introduced is lower.The transmission zero introduced by sinuous ground connection high resistant line 6 regulates in the upper stopband of band pass filter or parasitic passband place, can significantly improve the degree of suppression of the bandwidth sum stopband of stopband on band pass filter that the present invention proposes structure.After according to the design initial value of required band pass filter electrical requirement determination high resistant line 5, fan-shaped minor matters line 8, stepped impedance line 9 and sinuous ground connection high resistant line 6, physical size can be optimized by full-wave electromagnetic simulation software, thus obtain better performance of filter.
In addition, select the medium substrate with high-k, the absolute physical length of high resistant line 5, sinuous high resistant line 6, fan-shaped minor matters line 8 and stepped impedance line 9 can be reduced, thus can obtain less filter absolute physical area.
The concrete structure size of the embodiment of the present invention is as follows: the domestic Arlon Diclad880 medium substrate adopting thickness 0.508mm, relative dielectric constant 2.2, and filter centre frequency and-3dB relative bandwidth are chosen as 880MHz and 85% respectively.The width of 50 ohm of feeder lines 4 is fixed as 1.55mm.Because the lower sideband cut-off frequency of band pass filter is about 1250MHz, therefore to arranges with the cut-off frequency of the low pass filter of fan-shaped minor matters line 8 based on high resistant line 5 and be greater than 1250MHz.The width of high resistant line 5 carefully reduces parasitic capacitance effect as far as possible, and length can be used for regulating inductance, and the length of final high resistant line 5 is 29.5mm, and width is 0.12mm.Radian and the radius of fan-shaped minor matters line 8 can be used to control capacittance, and radius is because point is to reduce stray inductance as far as possible, and the radian of the most fan-shaped minor matters line 8 is 114 °, and radius is 7.1mm; Should the try one's best lower sideband cut-off frequency of close band pass filter of the transmission zero that stepped impedance line 9 is introduced is about 1250MHz, therefore stepped impedance line 9 high low-resistance parts point length and be adjusted to close to 1250MHz to improve the abruptness of low pass filter lower sideband, regulate the high low-resistance parts of stepped impedance line 9 point length ratio and impedance ratio can regulate the relative ratio of a transmission zero and high order transmission zero, be used for suppressing parasitic frequency response.Final stepped impedance line 9 high impedance section total length is 9.78mm, and width is 0.5mm; Stepped impedance line 9 Low ESR part total length is 16.1mm, and width is 2.2mm.The upper stopband that the transmission zero that the ground connection high resistant line 6 that wriggles is introduced should be arranged on band pass filter is interior to suppress parasitic frequency to respond.The final total length wriggling ground connection high resistant line 6 is 27.6mm, and width is 0.35mm.The ground connection high resistant line 6 that wriggles is set to 1.0mm with the diameter of the ground connection via hole 7 of medium substrate lower surface ground plane.The whole size not comprising 50 ohm of feeder line 4 circuit layers is only 0.123 λ
g× 0.073 λ
g, λ here
grepresent in the guide wavelength of 880MHz frequency place 50 ohm transmission line on used medium substrate.Fig. 2 gives the typical frequencies response of the miniaturized ultra-wide stopband microwave microstrip bandpass filter designed by structure of the present invention.As seen from the figure, at 880MHz filter centre frequency place, the insertion loss of the miniaturized ultra-wide stopband microwave microstrip bandpass filter designed by structure of the present invention is only 0.5dB, and echo response is better than 15dB in most passband.In 1.37GHz to 13.2GHz frequency range, the stopband of miniaturized ultra-wide stopband microwave microstrip bandpass filter suppresses all to be better than 20dB.
Claims (9)
1. a miniaturized ultra-wide stopband microwave microstrip broadband band pass filter, is characterized in that comprising SMA connector (2), 50 ohm of feeder lines (4), high resistant line (5), ground connection high resistant line (6), fan-shaped minor matters line (8) and stepped impedance lines (9); The central point of high resistant line (5) is provided with a pair fan-shaped minor matters line (8), and being connected 50 ohm of feeder lines (4) respectively with the terminal A 1 at upper and lower symmetrical high resistant line (5) two ends of the horizontal center line of high resistant line and A2, the probe on SMA connector (2) is connected with 50 ohm of feeder lines (4); Terminal A 1 at high resistant line (5) two ends and A2 place are also connected stepped impedance line (9) respectively, also connect ground connection high resistant line (6) respectively; The other end of described ground connection high resistant line (6) is provided with ground connection via hole (7), and described SMA connector (2), 50 ohm of feeder lines (4), high resistant line (5), ground connection high resistant line (6), fan-shaped minor matters line (8) and stepped impedance lines (9) are fixed on medium substrate (3).
2. miniaturized ultra-wide stopband microwave microstrip broadband band pass filter according to claim 1, it is characterized in that: described stepped impedance line (9) comprises high impedance section and Low ESR part, what be connected with terminal A 1 and A2 is high impedance section, then connects Low ESR part.
3. miniaturized ultra-wide stopband microwave microstrip broadband band pass filter according to claim 1, is characterized in that: the frequency of the described length of stepped impedance line (9) and the transmission zero of its introducing is inversely proportional to.
4. miniaturized ultra-wide stopband microwave microstrip broadband band pass filter according to claim 3, is characterized in that: by regulating the length ratio of stepped impedance line (9) high impedance section and Low ESR part and width than the position of carrying out adjustment transmission zero and high order transmission zero.
5. miniaturized ultra-wide stopband microwave microstrip broadband band pass filter according to claim 1, is characterized in that: radius or the radian of described fan-shaped minor matters line (8) are directly proportional to lumped capacity value.
6. miniaturized ultra-wide stopband microwave microstrip broadband band pass filter according to claim 1, is characterized in that: described high resistant line (5) length is directly proportional to lumped inductance value.
7. miniaturized ultra-wide stopband microwave microstrip broadband band pass filter according to claim 1, is characterized in that: the frequency of the described length of ground connection high resistant line (6) and the transmission zero of its introducing is inversely proportional to.
8. miniaturized ultra-wide stopband microwave microstrip broadband band pass filter according to claim 1, is characterized in that: described stepped impedance line (9) is folded into serpentine shape.
9. miniaturized ultra-wide stopband microwave microstrip broadband band pass filter according to claim 1, is characterized in that: described ground connection high resistant line (6) is folded into serpentine shape.
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| CN106058399B (en) * | 2016-05-13 | 2019-04-16 | 电子科技大学 | A kind of band-pass filter with wide stop band |
| CN106326542B (en) * | 2016-08-19 | 2019-04-23 | 西安电子科技大学 | Low pass filter design method based on DGS |
| CN107331925A (en) * | 2017-05-31 | 2017-11-07 | 中国电子科技集团公司第十三研究所 | Trapper chip |
| CN107425236B (en) * | 2017-06-15 | 2019-12-17 | 西安电子工程研究所 | Filtering integrated single-pole double-throw switch and microstrip line filtering integrated single-pole double-throw switch |
| CN110518314B (en) * | 2019-09-07 | 2020-12-01 | 西南交通大学 | Multi-band elimination filter based on hybrid electromagnetic coupling multi-mode resonator |
| CN113285194B (en) * | 2021-05-28 | 2022-07-22 | 安徽华东光电技术研究所有限公司 | Miniaturized wide-suppression-band low-pass microstrip filter |
| CN113381143B (en) * | 2021-06-03 | 2022-05-20 | 南京工程学院 | Microstrip low-pass filter and transmission zero determination and frequency setting method |
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| CN101694899A (en) * | 2009-10-16 | 2010-04-14 | 电子科技大学 | Microstrip bandpass filter with sector open-circuit structure |
| CN201503902U (en) * | 2009-09-23 | 2010-06-09 | 东南大学 | Filter capable of suppressing out-of-band harmonic and spurious signals |
| CN101997149A (en) * | 2009-08-25 | 2011-03-30 | 智捷科技股份有限公司 | Electromagnetic interference eliminator with bandpass filtering function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101997149A (en) * | 2009-08-25 | 2011-03-30 | 智捷科技股份有限公司 | Electromagnetic interference eliminator with bandpass filtering function |
| CN201503902U (en) * | 2009-09-23 | 2010-06-09 | 东南大学 | Filter capable of suppressing out-of-band harmonic and spurious signals |
| CN101694899A (en) * | 2009-10-16 | 2010-04-14 | 电子科技大学 | Microstrip bandpass filter with sector open-circuit structure |
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