CN105514545A - Compact type wide stopband high-selectivity microstrip filter - Google Patents
Compact type wide stopband high-selectivity microstrip filter Download PDFInfo
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- CN105514545A CN105514545A CN201610033781.3A CN201610033781A CN105514545A CN 105514545 A CN105514545 A CN 105514545A CN 201610033781 A CN201610033781 A CN 201610033781A CN 105514545 A CN105514545 A CN 105514545A
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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 invention discloses a compact type wide stopband high-selectivity microstrip filter, which is formed on a medium substrate. A microstrip line circuit is printed at the upper layer of the medium substrate, and the lower layer of the medium substrate is completely covered by metal copper as the ground of the filter. The microstrip line circuit is vertically symmetric to a symmetric axis, each side respectively comprises a feeder line, an open stub, a resonator and a metallic through hole, each open stub is parallel with the symmetric axis, one end of each feeder line is vertically connected with a middle point of the corresponding open stub to form a source and load coupling structure, and the other end of each feeder line is used as an input or output port of the filter; each resonator adopts a stepped impedance resonator, and comprises two microstrip lines with different widths, the two microstrip lines are respectively parallel with the symmetric axis, and are connected along the symmetric axis, and each resonator is grounded via the corresponding metallic through hole along the tail end of the symmetric axis. The compact type wide stopband high-selectivity microstrip filter has the advantages that by adopting the structure, the selectivity is high, the structure is compact, and the stopband is wide; the whole circuit structure is simple, and the processing is easy.
Description
Technical field
The invention belongs to wireless communication technology field, particularly a kind of compact Wide stop bands high selectivity microstrip filter being applied to narrowband systems and wireless local area network (WLAN) system.
Background technology
Filter is the requisite parts of system such as modern microwave trunking traffic, microwave satellite communication, electronic countermeasures, is also the microwave passive component the most important, technology content is the highest simultaneously.Along with the development of hyundai electronics science and technology, available frequency spectrum resource growing tension is therefore more and more higher to the requirement of filter frequencies selectivity characteristic.In order to improve message capacity and avoid the interference between adjacent channel, require that filter must have precipitous Out-of-band rejection, what is more important, in order to meet the trend toward miniaturization of Modern communications terminals, require that filter will have less volume and weight, filter size is even more important than performance sometimes.So the good filter of a kind of compact conformation, frequency selectivity just has vital effect to Modern Communication System, this case produces based on this kind of background just.
Summary of the invention
Object of the present invention, be to provide a kind of compact Wide stop bands high selectivity microstrip filter, it has the advantage of high selectivity, compact conformation, Wide stop bands, and whole circuit structure is simple, is easy to processing.
In order to reach above-mentioned purpose, solution of the present invention is:
A kind of compact Wide stop bands high selectivity microstrip filter, be formed on medium substrate, at medium substrate upper strata printed microstrip line circuit, the lower floor of medium substrate is covered completely by metallic copper, as the ground of filter.
Above-mentioned microstrip circuitry is symmetrical up and down along symmetry axis, every side includes feeder line, open circuit minor matters, resonator and metallization via hole, wherein, open circuit minor matters are parallel to symmetry axis, one end of feeder line is connected with the middle point vertical of open circuit minor matters, and forming source and load coupling structure, the other end of feeder line inputs or outputs port as filter; Resonator adopts stepping electric impedance resonator, and comprise the microstrip line that two sections of width do not wait, two sections of microstrip lines are all parallel with symmetry axis, and are connected along symmetry axis, and resonator is passing through metallization via hole ground connection along symmetrical axial end.
Above-mentioned resonator is between symmetry axis and open circuit minor matters.
In two sections of microstrip lines of above-mentioned resonator, wider microstrip line, along being 1.1mm perpendicular to the width on symmetry axis direction, is being 10.57mm along the length on symmetry axis direction; Narrower microstrip line, along being 0.2mm perpendicular to the width on symmetry axis direction, is being 5.73mm along the length on symmetry axis direction.
Two resonators of above-mentioned symmetry axis both sides are along being 1.2mm perpendicular to the distance on symmetry axis direction.
The radius of above-mentioned metallization via hole is 0.3mm.
Above-mentioned open circuit minor matters are along being 0.3mm perpendicular to the width on symmetry axis direction, be 10.57mm along the length on symmetry axis direction, between these open circuit minor matters and microstrip line wider in symmetry axis homonymy resonator, along being 0.1mm perpendicular to the width on symmetry axis direction.
Above-mentioned feeder line comprises rectangular shaped microstrip and the micro-band of isosceles trapezoid, and wherein, the upper base of the micro-band of isosceles trapezoid is connected with a limit of rectangular shaped microstrip, goes to the bottom to be connected with minor matters of opening a way; Described rectangular shaped microstrip is being 1.565mm along the width on symmetry axis direction, and its characteristic impedance is 50 ohm, and the micro-band of isosceles trapezoid is along being 1mm perpendicular to the height on symmetry axis direction, and upper base width is 1.565mm, and width of going to the bottom is 0.36mm.
After adopting such scheme, the present invention has following characteristics:
(1) first, second resonator forming filter is stepping electric impedance resonator, compared to the long-pending reduction of quarter-wave resonance body;
(2) hybrid coupled between first, second resonator can produce a transmission zero at the lower limb of passband, and the harmonic frequency of stepping electric impedance resonator (SIR) in higher frequency range, can achieve the Wide stop bands of filter;
(3) first, second open circuit minor matters are connected with first, second feeder line, and minimum to the stereomutation of filter, it produces a transmission zero at passband top edge;
(4) whole filter has the advantages such as high selectivity, simple and compact for structure, Wide stop bands.
Accompanying drawing explanation
Fig. 1 be the present invention adopt the structural representation of printed circuit board (PCB);
Fig. 2 is structural representation of the present invention;
Fig. 3 is scattering parameter simulate and test result schematic diagram of the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention and beneficial effect are described in detail.
The invention provides a kind of compact Wide stop bands high selectivity microstrip filter, adopt relative dielectric constant be 2.2, thickness be the pcb board of 0.508mm as medium substrate, the pcb board of other specifications can certainly be adopted as substrate.As shown in Figure 1, metal level S2 and lower metal layer S3 is coated with respectively on the upper and lower surface of the medium substrate S1 of pcb board, in the present embodiment, at upper metal level S2 printed microstrip line circuit, lower metal layer S3 adopts metallic copper, the lower surface of medium substrate S1 is covered completely, as the ground of filter.
As shown in Figure 2, be schematic top plan view of the present invention, whole microstrip filter is symmetrical about X-axis.Wherein, first resonator 21, second resonator 22 is stepping electric impedance resonator (SIR), form resonator be two sections perpendicular to width in X-direction not wait microstrip line, its wider part, along being 1.1mm perpendicular to the width in X-direction, is 10.57mm along the length in X-direction; Narrower part, along being 0.2mm perpendicular to the width in X-direction, is 5.73mm along the length in X-direction.Between first resonator 21 and the second resonator 22, edge is 1.2mm perpendicular to the distance in X-direction.First resonator 21 passes through the first metallization via hole 41 ground connection along the end of X-direction, and the radius of metallization via hole is 0.3mm.Second resonator 22 passes through the second metallization via hole 42 ground connection along the end of X-direction, and the radius of metallization via hole is 0.3mm.First open circuit minor matters 31 are parallel with X-axis, be located at the upside of the first resonator 21, it, along being 0.3mm perpendicular to the width in X-direction, is 10.57mm along the length in X-direction, with the microstrip line of formation first resonator 21 wider portion along being 0.1mm perpendicular to the distance in X-direction.Second open circuit minor matters 32 are parallel with X-axis, be located at the downside of the second resonator 22, it, along being 0.3mm perpendicular to the width in X-direction, is 10.57mm along the length in X-direction, with the microstrip line of formation second resonator 22 wider portion along being 0.1mm perpendicular to the distance in X-direction.First feeder line 11 is connected with the first middle point vertical of opening a way minor matters 31, and it is connected by the micro-band of rectangular shaped microstrip and isosceles trapezoid to form: the upper base forming the micro-band of isosceles trapezoid of the first feeder line 11 is connected with rectangular shaped microstrip, and the minor matters 31 of opening a way with first of going to the bottom are connected; The rectangular shaped microstrip forming the first feeder line 11 is 1.565mm along the width in X-direction, and its characteristic impedance is 50 ohm; Form the micro-band of isosceles trapezoid of the first feeder line 11 along being 1mm perpendicular to the height in X-direction, upper base width is 1.565mm, and width of going to the bottom is 0.36mm.Second feeder line 12 is connected with the second middle point vertical of opening a way minor matters 32, and it is connected by the micro-band of rectangular shaped microstrip and isosceles trapezoid to form: the upper base forming the micro-band of isosceles trapezoid of the second feeder line 12 is connected with rectangular shaped microstrip, and the minor matters 32 of opening a way with second of going to the bottom are connected; The rectangular shaped microstrip forming the second feeder line 12 is 1.565mm along the width in X-direction, and its characteristic impedance is 50 ohm; Form the micro-band of isosceles trapezoid of the second feeder line 12 along being 1mm perpendicular to the height in X-direction, upper base width is 1.565mm, and width of going to the bottom is 0.36mm.
The rectangular shaped microstrip forming the first feeder line 11 and isosceles trapezoid be micro-is with the other end that is connected as first port (port1) of filter, the rectangular shaped microstrip forming the second feeder line 12 and isosceles trapezoid be micro-is with the other end that is connected as second port (port2) of filter, first, second port is respectively as the input port of filter and output port, and all adopt the welding of SMA head, so that access is tested or is connected with circuit.
The size of the first resonator 21 and the second resonator 22 determines the resonance frequency of filter, has electromagnetism hybrid coupled between two resonators, can produce a transmission zero at the upper stopband of filter.The introducing of the first open circuit minor matters 21 and the second open circuit minor matters 22 can produce a transmission zero at lower stopband.Because first, second resonator is stepping electric impedance resonator (SIR), described filter can produce wider upper stopband.The microstrip filter of conceptual design thus, has the advantages such as compact conformation, high selectivity, Wide stop bands, and is easy to processing.
As shown in Figure 3, be scattering parameter emulation and the measured result comparison diagram of filter of the present invention, wherein, what emulation adopted is HFSS software, what test adopted is Agilent N5230C vector network analyzer, and the centre frequency of described filter is the 3dB relative bandwidth of 2.4GHz, S21 is 6%.As can see from Figure 3 emulation and measured result substantially identical, wherein the insertion loss of measure error is slightly bigger than normal is come from mismachining tolerance and the radiation loss of slotted line in test process.Return loss in passband is less than-15dB, and respectively there is a transmission zero its both sides, improve the frequency selectivity of filter.Can finding out that the S21 parameter of the upper stopband of filter is all less than-20dB substantially when being less than 12Ghz equally, demonstrating this filter and there is very wide stopband.
Comprehensively above-mentioned, a kind of compact Wide stop bands of the present invention high selectivity microstrip filter, the resonator forming filter is two stepping electric impedance resonators (SIR), reduces circuit size with this; The microstrip line mid point be positioned on the upside of the first resonator is connected with the first feeder line, and itself and the first resonator produce capacitive coupling feed; The microstrip line mid point be positioned on the upside of the second resonator is connected with the second feeder line, and itself and the second resonator produce capacitive coupling.Hybrid coupled between first, second resonator can produce a transmission zero at upper stopband; The microstrip line be connected with the first feeder line and the microstrip line be connected with the second feeder line produce source and load coupling, can produce a transmission zero, drastically increase the frequency selectivity of passband at lower stopband.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (8)
1. a compact Wide stop bands high selectivity microstrip filter, is characterized in that: be formed on medium substrate, at medium substrate upper strata printed microstrip line circuit, the lower floor of medium substrate is covered completely by metallic copper, as the ground of filter.
2. a kind of compact Wide stop bands high selectivity microstrip filter as claimed in claim 1, it is characterized in that: described microstrip circuitry is symmetrical up and down along symmetry axis, every side includes feeder line, open circuit minor matters, resonator and metallization via hole, wherein, open circuit minor matters are parallel to symmetry axis, one end of feeder line is connected with the middle point vertical of open circuit minor matters, and forms source and load coupling structure, and the other end of feeder line inputs or outputs port as filter; Resonator adopts stepping electric impedance resonator, and comprise the microstrip line that two sections of width do not wait, two sections of microstrip lines are all parallel with symmetry axis, and are connected along symmetry axis, and resonator is passing through metallization via hole ground connection along symmetrical axial end.
3. a kind of compact Wide stop bands high selectivity microstrip filter as claimed in claim 2, is characterized in that: described resonator is between symmetry axis and open circuit minor matters.
4. a kind of compact Wide stop bands high selectivity microstrip filter as claimed in claim 2, it is characterized in that: in two sections of microstrip lines of described resonator, wider microstrip line, along being 1.1mm perpendicular to the width on symmetry axis direction, is being 10.57mm along the length on symmetry axis direction; Narrower microstrip line, along being 0.2mm perpendicular to the width on symmetry axis direction, is being 5.73mm along the length on symmetry axis direction.
5. a kind of compact Wide stop bands high selectivity microstrip filter as claimed in claim 4, is characterized in that: two resonators of described symmetry axis both sides are along being 1.2mm perpendicular to the distance on symmetry axis direction.
6. a kind of compact Wide stop bands high selectivity microstrip filter as claimed in claim 4, is characterized in that: the radius of described metallization via hole is 0.3mm.
7. a kind of compact Wide stop bands high selectivity microstrip filter as claimed in claim 4, it is characterized in that: described open circuit minor matters are along being 0.3mm perpendicular to the width on symmetry axis direction, be 10.57mm along the length on symmetry axis direction, between these open circuit minor matters and microstrip line wider in symmetry axis homonymy resonator, along being 0.1mm perpendicular to the width on symmetry axis direction.
8. a kind of compact Wide stop bands high selectivity microstrip filter as claimed in claim 4, it is characterized in that: described feeder line comprises rectangular shaped microstrip and the micro-band of isosceles trapezoid, wherein, the upper base of the micro-band of isosceles trapezoid is connected with a limit of rectangular shaped microstrip, goes to the bottom to be connected with minor matters of opening a way; Described rectangular shaped microstrip is being 1.565mm along the width on symmetry axis direction, and its characteristic impedance is 50 ohm, and the micro-band of isosceles trapezoid is along being 1mm perpendicular to the height on symmetry axis direction, and upper base width is 1.565mm, and width of going to the bottom is 0.36mm.
Priority Applications (1)
| 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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| 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 true CN105514545A (en) | 2016-04-20 |
| CN105514545B CN105514545B (en) | 2018-04-17 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106816674A (en) * | 2017-02-13 | 2017-06-09 | 石家庄创天电子科技有限公司 | A kind of many transmission zero wave filters |
| CN106848506A (en) * | 2017-01-11 | 2017-06-13 | 电子科技大学 | Microstrip filter method for designing |
| 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 |
| WO2018171179A1 (en) * | 2017-03-18 | 2018-09-27 | 深圳市景程信息科技有限公司 | Dual-band bandpass filter with 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 |
| CN113193316A (en) * | 2021-04-30 | 2021-07-30 | 南通大学 | Non-reflection band-pass filter based on double-sided parallel strip lines |
| US11228077B2 (en) | 2019-06-17 | 2022-01-18 | Carrier Corporation | Microstrip DC block |
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 | Miniaturization dual-band band-pass filter based on ladder impedance |
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2016
- 2016-01-19 CN CN201610033781.3A patent/CN105514545B/en not_active Expired - Fee Related
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 | Miniaturization dual-band band-pass filter based on ladder impedance |
Non-Patent Citations (1)
| Title |
|---|
| YI-MING CHEN 等: ""Design of Stepped-Impedance Combline Bandpass Filters With Symmetric Insertion-Loss Response and Wide Stopband Range"", 《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 * |
Cited By (8)
| 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 |
| CN106816674A (en) * | 2017-02-13 | 2017-06-09 | 石家庄创天电子科技有限公司 | A kind of many transmission zero wave filters |
| WO2018171179A1 (en) * | 2017-03-18 | 2018-09-27 | 深圳市景程信息科技有限公司 | Dual-band bandpass filter with high selectivity |
| 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 |
| US11228077B2 (en) | 2019-06-17 | 2022-01-18 | Carrier Corporation | Microstrip DC block |
| CN113193316A (en) * | 2021-04-30 | 2021-07-30 | 南通大学 | Non-reflection band-pass filter based on double-sided parallel strip lines |
| CN113193316B (en) * | 2021-04-30 | 2021-10-29 | 南通大学 | Non-reflection band-pass filter based on double-sided parallel strip lines |
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| CN105514545B (en) | 2018-04-17 |
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