CN106848504A - A kind of micro-strip double-G type narrow band filter - Google Patents
A kind of micro-strip double-G type narrow band filter Download PDFInfo
- Publication number
- CN106848504A CN106848504A CN201710213228.2A CN201710213228A CN106848504A CN 106848504 A CN106848504 A CN 106848504A CN 201710213228 A CN201710213228 A CN 201710213228A CN 106848504 A CN106848504 A CN 106848504A
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- microstrip line
- narrow band
- micro
- filter
- band filter
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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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
- H01P7/088—Tunable resonators
Abstract
A kind of micro-strip double-G type narrow band filter of the disclosure of the invention, belongs to microwave engineering techniques field, particularly narrow band filter field.It is centrosymmetric arranged distribution by the asymmetric G types resonator element of meander line more than two, realize the electric field magnetic field hybrid coupled around central point, the volume of resonator is effectively reduced, the scope of suppressed sideband has been widened, the super flat narrow band filter of Out-of-band rejection ultra-wide is realized.By using electromagnetism hybrid coupled mode between two resonant elements, magnetic coupling, separately designing of being electrically coupled are avoided, effectively reduce the size of wave filter, control bandwidth.The Out-of-band rejection of ultra-wide is realized using asymmetric coupled resonance model of element.In the form of micro-strip, it is to avoid complicated debugging process after such as cavity body filter processing, in PCB integrated circuits, can with substrate disposal molding, it is to avoid installation, welding process.
Description
Technical field
The invention belongs to microwave engineering techniques field, particularly narrow band filter field.
Background technology
With the fast development of radar, precise guidance, remote sensing and telecommunications industry, to miniaturization, high performance narrow
Become more and more urgent the need for band bandpass filter.In various circuit structures, processing is simple, exempt from tune with it for microstrip line construction
Examination, low cost, the advantages of be easily integrated, it is widely used.Therefore, the narrow band filter of microstrip structure is always nothing
The emphasis and focus of line communications field research.Traditional micro-strip open circuit ring resonance structure wave filter has that volume is larger, insertion is damaged
Consumption is big, poor, not easy of integration squareness factor, adjacent pass-bands mutual interference the problems such as.
J.S.Hong and M.J.Lancaster proposed a kind of micro-strip open circuit ring resonance structure wave filter in 1996[1],
The wave filter has that volume is big, adjacent pass-bands；Chu Qingxin and Wang Huan disclosed a kind of controllable electromagnetic in 2009
The invention of coupling microstrip split-ring resonator filter[2], but the resonator in its micro-strip resonantor group is arranged in a linear, and accounts for
It is still very big with area, and low-impedance line high is used, debug more complicated.Zheng Hong is emerging et al. devised in 2010 it is a kind of include it is micro-
With the square open circuit ring of line, two pectination branch roads and two narrow band filters of input and output L-type microstrip line[3], although structure
It is compacter but construct it is still more complicated, and can not effectively suppress the second band logical interference；Ling Wang et al. were proposed in 2012
A kind of design of narrow band filter, but structure is very complicated, and volume is larger[4].Mudrik Alaydrus et al. exist
Propose within 2013 a kind of design of cross-coupling band pass filter[5]Although the simple volume of its structure is unfavorable for greatly collection
Into.
Traditional narrow band filter, is generally based on general Chebyshev filters integrated approach, separately emulation meter
The magnetic coupling coefficient and electric coupling coefficient of coupling unit are calculated, the coupled modes between two resonant elements are for magnetic coupling or are electrically coupled
In one kind, to realize narrow band filter, such design undoubtedly increased area, and insertion loss is big；Multi-resonant unit
Cross-couplings cause the parasitic passband of wave filter with centre frequency at a distance of relatively near, very flat Out-of-band rejection can not be reached.
The content of the invention
The present invention is in view of the shortcomings of the prior art, it is proposed that a kind of high performance narrow band filter of miniaturization, should
Wave filter innovatively employs double-G type Central Symmetry microstrip structure, solves insertion when traditional narrow bandpass filter is transmitted
Loss is big, the problem that Out-of-band rejection is not high enough, squareness factor is poor.
The present invention is centrosymmetric arranged distribution by the asymmetric G types resonator element of meander line more than two, is realized
Electric field magnetic field hybrid coupled around central point, effectively reduces the volume of resonator, has widened the scope of suppressed sideband, realizes
Out-of-band rejection ultra-wide super flat narrow band filter.Thus the technical scheme is that a kind of micro-strip double-G type arrowband
Bandpass filter, the wave filter includes substrate and the microstrip line being arranged on substrate, and wherein microstrip line includes：Input microstrip line,
Input coupling microstrip line, output coupling microstrip line, output microstrip line；It is characterized in that the input coupling microstrip line and output coupling
It is that, by micro- G type structures for constituting, input microstrip line is connected with the exterior bottom of input coupling microstrip line G type structures to close microstrip line,
Input microstrip line and input coupling microstrip line constitute shape with output microstrip line and output coupling microstrip line composition shape be in
Central Symmetry, the top end of input coupling microstrip line G type structures is relative with the top end of output coupling microstrip line G type structures
And be not connected to.
Further, by adjusting the top latter end micro-strip of input coupling microstrip line and output coupling microstrip line G type structures
The distance between line and inside end microstrip line, realize the regulation to the wave filter electromagnetic coupled coefficient.
The present invention avoids magnetic coupling, is electrically coupled by using electromagnetism hybrid coupled mode between two resonant elements
Separately design, effectively reduce the size of wave filter, control bandwidth.Realized using asymmetric coupled resonance model of element
The Out-of-band rejection of ultra-wide.In the form of micro-strip, it is to avoid complicated debugging process after such as cavity body filter processing,
In PCB integrated circuits, can with substrate disposal molding, it is to avoid installation, welding process.
Brief description of the drawings
Fig. 1 is double-G type narrow band filter structural representation in the present invention；
Fig. 2 is the frequency response characteristic result figure of the specific embodiment of the invention.
Specific embodiment
The present invention is a kind of double-G type narrow band filter, including the G types that two many meander lines being centrosymmetric are constituted
Resonance structure, input microstrip transmission line, an output microstrip transmission line, substrate is Rogers RO4350.It is characterized in that
It is centrosymmetric arranged distribution by the asymmetric G types resonator element of meander line more than two, realizes the electricity around central point
Field magnetic field hybrid coupled, effectively reduces the volume of resonator, has widened the scope of suppressed sideband, realizes Out-of-band rejection ultra-wide
Super flat narrow band filter.
Specific design method is as shown in Figure 1 structural representation of the invention, and the wave filter is placed on substrate 12.Signal by
Input 01 (13) is input into, and by 13 (01) outputs, many meander line G type resonant elements is constituted by 03~08.Two resonant elements exist
Hybrid coupled is formed in elliptic region shown in 11.Can be with by the spacing for adjusting meander line 08 and 09,08 and 07 (08 and 10)
Effective regulation electromagnetic coupled coefficient, realizes the control to filter bandwidht and with interior ripple.It is made up of adjustment 03~08 many
The length of meander line G type resonant elements, can effectively adjust the resonant frequency of resonant element, form the Out-of-band rejection of miniaturization
The narrow band filter of the super flat planar transmission cable architecture of ultra-wide.In a word, the invention simplifies filter construction, reduces filter
Ripple device area takes, and facilitates processing and debugging, and can obtain the excellent filtering such as relatively good sideband selectivity, harmonics restraint degree
Characteristic.
In Fig. 2 with triangle mark curve be reflectivity curve S11, without be transmission curve S21, S21 represents filtering
Degree of suppression of the device to transverse axis corresponding frequencies；S11 represents the reflected intensity of input port, and smaller explanation reflection is weaker, and transporting is got over
It is good.Micro-strip double-G type narrow band filter centre frequency 4560MHz of the invention, bandwidth 100MHz, relative bandwidth 2.2% are inserted
3dB is damaged, lower sideband suppresses from 0GHz to 4.4GHz, upper sideband suppresses from 4.8GHz to 10GHz, to suppress to be more than 20dB, suppresses side
Band scope is very wide, and Out-of-band rejection ultra-wide is super flat, and out-of-band harmonics rejection ability is strong, without in conjunction with DGS, SIR, Short-Stub
Or the structure such as Open-Stub suppresses second harmonic.Passband edge is formed due to the presence of 0 ° of feed structure and hybrid coupled
Two transmission zeros, can improve sideband selectivity on the premise of cross coupling structure is not used, and combined impedance is converted
Device can also keep that dead-center position is adjusted flexibly in the case that passband width is constant.
Claims (2)
1. a kind of micro-strip double-G type narrow band filter, the wave filter includes substrate and the microstrip line being arranged on substrate, wherein
Microstrip line includes：Input microstrip line, input coupling microstrip line, output coupling microstrip line, output microstrip line；It is characterized in that described
Input coupling microstrip line and output coupling microstrip line are by micro- G type structures for constituting, input microstrip line and input coupling microstrip line G
The exterior bottom connection of type structure, the shape that input microstrip line and input coupling microstrip line are constituted and output microstrip line and output coupling
The shape for closing microstrip line composition is centrosymmetric, top end and the output coupling microstrip line G of input coupling microstrip line G type structures
The top end of type structure is relative and is not connected to.
2. a kind of micro-strip double-G type narrow band filter as claimed in claim 1, it is characterised in that by adjusting input coupling
The distance between top latter end microstrip line and inside end microstrip line of microstrip line and output coupling microstrip line G type structures, realize
Regulation to the wave filter electromagnetic coupled coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710213228.2A CN106848504B (en) | 2017-04-01 | 2017-04-01 | A kind of micro-strip double-G type narrow band filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710213228.2A CN106848504B (en) | 2017-04-01 | 2017-04-01 | A kind of micro-strip double-G type narrow band filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106848504A true CN106848504A (en) | 2017-06-13 |
| CN106848504B CN106848504B (en) | 2019-06-14 |
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|---|---|---|---|
| CN201710213228.2A Expired - Fee Related CN106848504B (en) | 2017-04-01 | 2017-04-01 | A kind of micro-strip double-G type narrow band filter |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090243760A1 (en) * | 2008-03-25 | 2009-10-01 | Min-Shun Hsu | Second-Order Band-Pass Filter and Wireless Apparatus Using the Same |
| JP2009253894A (en) * | 2008-04-10 | 2009-10-29 | National Institute Of Information & Communication Technology | High-frequency band pass filter |
| CN101599568A (en) * | 2009-07-09 | 2009-12-09 | 北京大学 | A kind of band pass filter that suppresses second harmonic |
| CN104051828A (en) * | 2014-06-24 | 2014-09-17 | 中国科学院微电子研究所 | Minitype band-pass filter with multiple transmission zero points |
| CN204216189U (en) * | 2014-09-23 | 2015-03-18 | 中国计量学院 | Symmetric double G shape band pass filter |
| CN204407453U (en) * | 2015-02-06 | 2015-06-17 | 中国计量学院 | Open rectangle ring band stop filter |
-
2017
- 2017-04-01 CN CN201710213228.2A patent/CN106848504B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090243760A1 (en) * | 2008-03-25 | 2009-10-01 | Min-Shun Hsu | Second-Order Band-Pass Filter and Wireless Apparatus Using the Same |
| JP2009253894A (en) * | 2008-04-10 | 2009-10-29 | National Institute Of Information & Communication Technology | High-frequency band pass filter |
| CN101599568A (en) * | 2009-07-09 | 2009-12-09 | 北京大学 | A kind of band pass filter that suppresses second harmonic |
| CN104051828A (en) * | 2014-06-24 | 2014-09-17 | 中国科学院微电子研究所 | Minitype band-pass filter with multiple transmission zero points |
| CN204216189U (en) * | 2014-09-23 | 2015-03-18 | 中国计量学院 | Symmetric double G shape band pass filter |
| CN204407453U (en) * | 2015-02-06 | 2015-06-17 | 中国计量学院 | Open rectangle ring band stop filter |
Non-Patent Citations (1)
| Title |
|---|
| 程伟: "微带超宽带和多通带带通滤波器的研究与设计", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
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| CN106848504B (en) | 2019-06-14 |
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