CN105514545B - A kind of compact Wide stop bands high selectivity microstrip filter - Google Patents
A kind of compact Wide stop bands high selectivity microstrip filter Download PDFInfo
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- CN105514545B CN105514545B CN201610033781.3A CN201610033781A CN105514545B CN 105514545 B CN105514545 B CN 105514545B CN 201610033781 A CN201610033781 A CN 201610033781A CN 105514545 B CN105514545 B CN 105514545B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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Abstract
The present invention discloses a kind of compact Wide stop bands high selectivity microstrip filter, is formed on medium substrate, in medium substrate upper strata printed microstrip line circuit, the lower floor of medium substrate is completely covered by metallic copper, the ground as wave filter.The microstrip circuitry is symmetrical above and below along symmetry axis, include feeder line, open circuit minor matters, resonator and metallization VIA per side, wherein, minor matters of opening a way are parallel to symmetry axis, one end of feeder line and the midpoint for minor matters of opening a way are vertically connected, and source and load coupled structure are formed, the input or output port of the other end of feeder line as wave filter；Resonator uses stepping electric impedance resonator, and the microstrip line not waited comprising two sections of width, two sections of microstrip lines are parallel with symmetry axis, and are connected along symmetry axis, and resonator is grounded along the end of symmetrical direction of principal axis by metallization VIA.Such a filter construction has the advantages that high selectivity, compact-sized, Wide stop bands, and whole circuit structure is simple, easy to process.
Description
Technical field
It is more particularly to a kind of to be applied to narrowband systems and wireless local area network (WLAN) system the invention belongs to wireless communication technology field
Compact Wide stop bands high selectivity microstrip filter.
Background technology
Wave filter is the essential composition portion of the systems such as modern microwave trunking traffic, microwave satellite communication, electronic countermeasure
Point, while be also mostly important, the highest microwave passive component of technology content.It is available with the development of hyundai electronics science and technology
Frequency spectrum resource growing tension, therefore to filter frequencies selection characteristic requirement it is higher and higher.In order to improve message capacity and
Avoid the interference between adjacent channel, it is desirable to which wave filter there must be precipitous Out-of-band rejection, it is even more important that in order to meet the modern times
The trend toward miniaturization of communication terminal, it is desirable to which wave filter will have the volume and weight of smaller, and wave filter size even compares performance sometimes
It is more important.So a kind of wave filter compact-sized, that frequency selectivity is good just have to Modern Communication System it is vital
Effect, this case are based on such a background and produce.
The content of the invention
The purpose of the present invention, is to provide a kind of compact Wide stop bands high selectivity microstrip filter, it is with high selection
The advantages of property, compact-sized, Wide stop bands, whole circuit structure is simple, easy to process.
In order to achieve the above objectives, solution of the invention is：
A kind of compact Wide stop bands high selectivity microstrip filter, is formed on medium substrate, is printed on medium substrate upper strata
Brush microstrip circuitry, the lower floor of medium substrate are completely covered by metallic copper, the ground as wave filter.
Above-mentioned microstrip circuitry is symmetrical above and below along symmetry axis, and feeder line, open circuit minor matters, resonator and metal are included per side
Change via, wherein, open circuit minor matters are vertically connected parallel to symmetry axis, one end of feeder line and the midpoint for minor matters of opening a way, and form source
With loading coupled structure, the input or output port of the other end of feeder line as wave filter；Resonator uses stepping impedance resonance
Device, the microstrip line not waited comprising two sections of width, two sections of microstrip lines are parallel with symmetry axis, and are connected along symmetry axis, and resonance
Device is grounded along the end of symmetrical direction of principal axis by metallization VIA.
Above-mentioned resonator is located between symmetry axis and open circuit minor matters.
In two sections of microstrip lines of above-mentioned resonator, wider microstrip line is being along the width on symmetrical direction of principal axis
1.1mm, is being 10.57mm along the length on symmetrical direction of principal axis；Width of the relatively narrow microstrip line on edge on symmetrical direction of principal axis
Spend for 0.2mm, be 5.73mm along the length on symmetrical direction of principal axis.
Two resonators of above-mentioned symmetry axis both sides are being 1.2mm along the distance on symmetrical direction of principal axis.
The radius of above-mentioned metallization VIA is 0.3mm.
Above-mentioned open circuit minor matters are being 0.3mm along width on symmetrical direction of principal axis, along the length on symmetrical direction of principal axis
Spend between 10.57mm, the open circuit minor matters and wider microstrip line in symmetry axis homonymy resonator, along perpendicular to symmetrical
Width on direction of principal axis is 0.1mm.
Above-mentioned feeder line includes rectangular shaped microstrip and isosceles trapezoid micro-strip, wherein, the upper bottom of isosceles trapezoid micro-strip and rectangle
The a line connection of micro-strip, bottom are connected with open circuit minor matters；The rectangular shaped microstrip is being along the width on symmetrical direction of principal axis
1.565mm, its characteristic impedance are 50 ohm, and isosceles trapezoid micro-strip is being 1mm along height on symmetrical direction of principal axis, upper bottom
Width is 1.565mm, and bottom width is 0.36mm.
After using the above scheme, the invention has the characteristics that：
(1) first, second resonator for forming wave filter is stepping electric impedance resonator, compared to quarter-wave resonance
Body product reduces；
Hybrid coupled between (2) first, second resonators can produce a transmission zero in the lower edge of passband, and
The harmonic frequency of stepping electric impedance resonator (SIR) in the frequency range of higher, can realize the Wide stop bands of wave filter；
(3) first, second open circuit minor matters are connected with first, second feeder line, and the stereomutation to wave filter is minimum, it is logical
Band top edge produces a transmission zero；
(4) whole wave filter has the advantages that high selectivity, simple and compact for structure, Wide stop bands.
Brief description of the drawings
Fig. 1 is the structure diagram that the present invention uses printed circuit board (PCB)；
Fig. 2 is the structure diagram of the present invention；
Fig. 3 is scattering parameter emulation and the test result schematic diagram of the present invention.
Embodiment
Below with reference to attached drawing, technical scheme and beneficial effect are described in detail.
The present invention provides a kind of compact Wide stop bands high selectivity microstrip filter, uses relative dielectric constant as 2.2, thickness
The pcb board for 0.508mm is spent as medium substrate, naturally it is also possible to using the pcb board of other specifications as substrate.Such as Fig. 1 institutes
Show, metal layer S2 and lower metal layer S3 have been respectively coated by the upper and lower surface of the medium substrate S1 of pcb board, in the present embodiment
In, in upper metal layer S2 printed microstrip line circuits, lower metal layer S3 uses metallic copper, the lower surface of medium substrate S1 is covered completely
Lid, the ground as wave filter.
As shown in Fig. 2, being the schematic top plan view of the present invention, whole microstrip filter is symmetrical on X-axis.Wherein, first is humorous
Shake device 21, the second resonator 22 is stepping electric impedance resonator (SIR), and form resonator is two sections perpendicular to X-direction
The microstrip line that upper width does not wait, its wider part is 1.1mm along the width in X-direction, along the length in X-direction
Spend for 10.57mm；Relatively narrow part is 0.2mm along the width in X-direction, is along the length in X-direction
5.73mm.Distance of the edge in X-direction is 1.2mm between first resonator 21 and the second resonator 22.First resonance
Device 21 is grounded along the end of X-direction by the first metallization VIA 41, and the radius of metallization VIA is 0.3mm.Second resonance
Device 22 is grounded along the end of X-direction by the second metallization VIA 42, and the radius of metallization VIA is 0.3mm.First open circuit
Minor matters 31 are parallel with X-axis, and positioned in the upside of the first resonator 21, it is 0.3mm along width in X-direction, along X
Length on direction of principal axis is 10.57mm, with forming the microstrip line of 21 wider portion of the first resonator along in X-direction
Distance is 0.1mm.Second open circuit minor matters 32 are parallel with X-axis, and positioned in the downside of the second resonator 22, its edge is perpendicular to X-axis side
Upward width is 0.3mm, is 10.57mm along the length in X-direction, the micro-strip with forming 22 wider portion of the second resonator
Line is 0.1mm along the distance in X-direction.First feeder line 11 and the midpoint of the first open circuit minor matters 31 are vertically connected, its
It is to be connected to form with isosceles trapezoid micro-strip by rectangular shaped microstrip：Form the upper bottom of the isosceles trapezoid micro-strip of the first feeder line 11 with it is rectangular
Shaped microstrip is connected, and bottom is connected with the first open circuit minor matters 31；The rectangular shaped microstrip of the first feeder line 11 is formed along the width in X-direction
Degree is 1.565mm, its characteristic impedance is 50 ohm；The isosceles trapezoid micro-strip of the first feeder line 11 is formed along in X-direction
Height be 1mm, upper bottom width 1.565mm, bottom width is 0.36mm.In second feeder line 12 and the second open circuit minor matters 32
Point is vertically connected, it is to be connected to form with isosceles trapezoid micro-strip by rectangular shaped microstrip：The isosceles trapezoid for forming the second feeder line 12 is micro-
The upper bottom of band is connected with rectangular shaped microstrip, and bottom is connected with the second open circuit minor matters 32；Form the rectangular shaped microstrip of the second feeder line 12
It is 1.565mm along the width in X-direction, its characteristic impedance is 50 ohm；Form the isosceles trapezoid micro-strip edge of the second feeder line 12
Height in X-direction is 1mm, and upper bottom width 1.565mm, bottom width is 0.36mm.
Form rectangular shaped microstrip and first of the other end that isosceles trapezoid micro-strip is connected as wave filter of the first feeder line 11
Port (port1), forms the other end that is connected with isosceles trapezoid micro-strip of rectangular shaped microstrip of the second feeder line 12 as wave filter
Second port (port2), first, second port and use SMA heads respectively as the input port and output port of wave filter
Welding, to access test or to be connected with circuit.
The size of first resonator 21 and the second resonator 22 determines the resonant frequency of wave filter, between two resonators
With electromagnetism hybrid coupled, a transmission zero can be produced in the upper stopband of wave filter.First open circuit minor matters 21 and second are opened
The introducing of road minor matters 22 can produce a transmission zero in lower stopband.Since first, second resonator is stepping impedance resonance
Device (SIR), the wave filter can produce wider upper stopband.Thus the microstrip filter of conceptual design, have it is compact-sized,
The advantages that high selectivity, Wide stop bands, and it is easy to process.
As shown in figure 3, be wave filter of the present invention scattering parameter emulation with measured result comparison diagram, wherein, emulation use
Be HFSS softwares, test and be using Agilent N5230C vector network analyzers, the centre frequency of the wave filter
The 3dB relative bandwidths of 2.4GHz, S21 are 6%.Emulation and measured result coincide substantially as can see from Figure 3, wherein measurement misses
The insertion loss of difference is slightly bigger than normal to be derived from the radiation loss of mismachining tolerance and slotted line during the test.Returning in passband
Ripple loss is less than -15dB, respectively there is a transmission zero in its both sides, improves the frequency selectivity of wave filter.It can also be seen that
The S21 parameters of the upper stopband of wave filter are substantially all in the case of less than 12Ghz is less than -20dB, demonstrates this filtering utensil
There is very wide stopband.
Summary, a kind of compact Wide stop bands high selectivity microstrip filter of the present invention, forms the resonator of wave filter
It is two stepping electric impedance resonators (SIR), circuit size is reduced with this；Microstrip line midpoint on the upside of the first resonator and the
One feeder line is connected, it produces capacitive coupling feed with the first resonator；Microstrip line midpoint on the upside of the second resonator and the
Two feeder lines are connected, it produces capacitive coupling with the second resonator.Hybrid coupled between first, second resonator can be in upper resistance
Band produces a transmission zero；The microstrip line being connected with the first feeder line and the microstrip line generating source being connected with the second feeder line and load
Coupling, can produce a transmission zero in lower stopband, drastically increase the frequency selectivity of passband.
Above example is merely illustrative of the invention's technical idea, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical solution, each falls within the scope of the present invention
Within.
Claims (5)
- A kind of 1. compact Wide stop bands high selectivity microstrip filter, it is characterised in that：It is formed on medium substrate, in medium base Plate upper strata printed microstrip line circuit, the lower floor of medium substrate are completely covered by metallic copper, the ground as wave filter；The microstrip circuitry is symmetrical above and below along symmetry axis, and feeder line, open circuit minor matters, resonator are included per side and was metallized Hole, wherein, open circuit minor matters are vertically connected parallel to symmetry axis, one end of feeder line and the midpoint of open circuit minor matters, and form source with bearing Carry coupled structure, the input or output port of the other end of feeder line as wave filter；Resonator uses stepping electric impedance resonator, bag The microstrip line not waited containing two sections of width, two sections of microstrip lines are parallel with symmetry axis, and are connected along symmetry axis, and resonator is on edge The end of symmetrical direction of principal axis is grounded by metallization VIA；In two sections of microstrip lines of the resonator, wider microstrip line is being 1.1mm along the width on symmetrical direction of principal axis, It is being 10.57mm along the length on symmetrical direction of principal axis；Relatively narrow microstrip line is being along width on symmetrical direction of principal axis 0.2mm, is being 5.73mm along the length on symmetrical direction of principal axis；The open circuit minor matters are being 0.3mm along the width on symmetrical direction of principal axis, are being along the length on symmetrical direction of principal axis 10.57mm, between the open circuit minor matters and wider microstrip line in symmetry axis homonymy resonator, along perpendicular to symmetry axis side Upward width is 0.1mm.
- A kind of 2. compact Wide stop bands high selectivity microstrip filter as claimed in claim 1, it is characterised in that：The resonance Device is located between symmetry axis and open circuit minor matters.
- A kind of 3. compact Wide stop bands high selectivity microstrip filter as claimed in claim 1, it is characterised in that：It is described symmetrical Two resonators of axis both sides are being 1.2mm along the distance on symmetrical direction of principal axis.
- A kind of 4. compact Wide stop bands high selectivity microstrip filter as claimed in claim 1, it is characterised in that：The metal The radius for changing via is 0.3mm.
- A kind of 5. compact Wide stop bands high selectivity microstrip filter as claimed in claim 1, it is characterised in that：The feeder line Comprising rectangular shaped microstrip and isosceles trapezoid micro-strip, wherein, the upper bottom of isosceles trapezoid micro-strip is connected with a line of rectangular shaped microstrip, Bottom is connected with open circuit minor matters；The rectangular shaped microstrip is being 1.565mm along the width on symmetrical direction of principal axis, its characteristic impedance is 50 ohm, isosceles trapezoid micro-strip is being 1mm, upper bottom width 1.565mm along height on symmetrical direction of principal axis, lower bottom width Spend for 0.36mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610033781.3A CN105514545B (en) | 2016-01-19 | 2016-01-19 | A kind of compact Wide stop bands high selectivity microstrip filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610033781.3A CN105514545B (en) | 2016-01-19 | 2016-01-19 | A kind of compact Wide stop bands high selectivity microstrip filter |
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| CN105514545A CN105514545A (en) | 2016-04-20 |
| CN105514545B true CN105514545B (en) | 2018-04-17 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106848506A (en) * | 2017-01-11 | 2017-06-13 | 电子科技大学 | Microstrip filter method for designing |
| CN206461069U (en) * | 2017-02-13 | 2017-09-01 | 石家庄创天电子科技有限公司 | A kind of many transmission zero wave filters |
| CN106921012B (en) * | 2017-03-18 | 2019-03-26 | 深圳市景程信息科技有限公司 | Highly selective double frequency band-pass filter |
| CN107453014A (en) * | 2017-06-21 | 2017-12-08 | 南京航空航天大学 | The wide upper high common mode inhibition micro-strip balanced duplexer of stopband of high selectivity |
| CN109546273A (en) * | 2018-11-15 | 2019-03-29 | 北京遥感设备研究所 | A kind of narrow band filter of wide upper stopband |
| EP3754780B1 (en) | 2019-06-17 | 2022-07-27 | Carrier Corporation | A microstrip dc block |
| CN113193316B (en) * | 2021-04-30 | 2021-10-29 | 南通大学 | Non-reflection band-pass filter based on double-sided parallel strip lines |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104051829A (en) * | 2014-06-24 | 2014-09-17 | 中国科学院微电子研究所 | Miniaturized dual-band-pass filter based on stepped impedance |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104051829A (en) * | 2014-06-24 | 2014-09-17 | 中国科学院微电子研究所 | Miniaturized dual-band-pass filter based on stepped impedance |
Non-Patent Citations (1)
| Title |
|---|
| "Design of Stepped-Impedance Combline Bandpass Filters With Symmetric Insertion-Loss Response and Wide Stopband Range";Yi-Ming Chen 等;《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》;20071031;第55卷(第10期);第2191-2199页 * |
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