CN106848504B - 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
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- CN106848504B CN106848504B CN201710213228.2A CN201710213228A CN106848504B CN 106848504 B CN106848504 B CN 106848504B CN 201710213228 A CN201710213228 A CN 201710213228A CN 106848504 B CN106848504 B CN 106848504B
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- microstrip line
- 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
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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
-
- 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
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- 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
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- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
A kind of micro-strip double-G type narrow band filter of the disclosure of the invention, belongs to microwave engineering techniques field, especially narrow band filter field.It is centrosymmetric arranged distribution by the asymmetric G type resonator element of meander line more than two, realize the electric field magnetic field hybrid coupled around central point, the volume for effectively reducing resonator has widened the range of suppressed sideband, realizes the super flat narrow band filter of Out-of-band rejection ultra-wide.By using electromagnetism hybrid coupled mode between two resonant elements, avoids magnetic coupling, separately designing of being electrically coupled, effectively reduce the size of filter, control bandwidth.The Out-of-band rejection of ultra-wide is realized using asymmetric coupled resonance model of element.Using the form of micro-strip, installation, welding process can be avoided with substrate disposal molding in PCB integrated circuit by avoiding the debugging process that such as cavity body filter is complicated after processing.
Description
Technical field
The invention belongs to microwave engineering techniques fields, especially narrow band filter field.
Background technique
With the fast development of radar, precise guidance, remote sensing and telecommunications industry, to miniaturization, high performance narrow
Need to become more more and more urgent with bandpass filter.In various circuit structures, the processing is simple, exempts to adjust with it for microstrip line construction
The advantages that trying, is at low cost, being easily integrated, is widely used.Therefore, the narrow band filter of microstrip structure is always nothing
The emphasis and hot spot of line communications field research.Traditional micro-strip open circuit ring resonance structure filter there are volumes larger, insertion damage
The problems such as consumption is big, squareness factor is poor, not easy of integration, adjacent pass-bands mutual interference.
J.S.Hong and M.J.Lancaster proposed a kind of micro-strip open circuit ring resonance structure filter in 1996[1],
The problems such as there are volumes for the filter greatly, adjacent pass-bands mutual interference；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 high low-impedance line is used, it debugs more complex.It includes micro- that Zheng Hongxing et al. was devised a kind of in 2010
Narrow band filter with the rectangular open circuit ring of line, two pectination branches and two input and output L-type microstrip lines[3]Although structure
Compacter but construction is still more complex, and the second band logical cannot effectively be inhibited to interfere；Ling Wang et al. was 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. exists
Propose a kind of design of cross-coupling band pass filter within 2013[5]Although the simple volume of structure is unfavorable for collecting greatly
At.
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 magnetic coupling or are electrically coupled
One of, Yao Shixian narrow band filter, such design undoubtedly increases area, and insertion loss is big；Multi-resonant unit
The cross-coupling parasitic passband that makes filter and centre frequency at a distance of relatively close, very flat Out-of-band rejection can not be reached.
Summary of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of high performance narrow band filters of miniaturization, should
Filter innovatively uses double-G type central symmetry microstrip structure, solves the insertion when transmission of traditional narrow bandpass filter
The problem that loss is big, Out-of-band rejection is not high enough, squareness factor is poor.
The present invention is centrosymmetric arranged distribution by the asymmetric G type 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 range 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 narrowband
Bandpass filter, the filter include substrate and the microstrip line that is set on substrate, wherein microstrip line include: 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
Closing microstrip line is to be inputted microstrip line by micro- G type structure constituted and connect with the exterior bottom of input coupling microstrip line G type structure,
The shape that input microstrip line and input coupling microstrip line are constituted and the shape of output microstrip line and output coupling microstrip line composition are in
The top end of central symmetry, input coupling microstrip line G type structure is opposite with the top end of output coupling microstrip line G type structure
And it is not connected to.
Further, pass through the top latter end micro-strip of adjusting input coupling microstrip line and output coupling microstrip line G type structure
The distance between line and inside end microstrip line realize the adjusting to the filter electromagnetic coupling 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 filter, control bandwidth.It is realized using asymmetric coupled resonance model of element
The Out-of-band rejection of ultra-wide.Using the form of micro-strip, the debugging process that such as cavity body filter is complicated after processing is avoided,
In PCB integrated circuit, installation, welding process can be avoided with substrate disposal molding.
Detailed description of the invention
Fig. 1 is double-G type narrow band filter structural schematic diagram 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, the G type constituted including two more meander lines being centrosymmetric
Resonance structure, an input microstrip transmission line, an output microstrip transmission line, substrate are Rogers RO4350.It is characterized in that
It is centrosymmetric arranged distribution by the asymmetric G type 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 range of suppressed sideband, realize Out-of-band rejection ultra-wide
Super flat narrow band filter.
Specific design method is structural schematic diagram of the invention as shown in Figure 1, which is placed on substrate 12.Signal by
Input terminal 01 (13) input, is exported by 13 (01), constitutes more meander line G type resonant elements by 03~08.Two resonant elements exist
Hybrid coupled is formed in elliptic region shown in 11.It can be with by adjusting the spacing of meander line 08 and 09,08 and 07 (08 and 10)
It is effective to adjust electromagnetic coupling coefficient, realize the control to filter bandwidht and with interior ripple.It is constituted by adjusting 03~08 more
The length of meander line G type resonant element, can effectively adjust the resonance 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 short, the invention simplifies filter construction, reduce filter
Wave device area occupies, and facilitates processing and debugging, and can get the excellent filtering such as relatively good sideband selectivity, harmonics restraint degree
Characteristic.
Curve with triangle mark in Fig. 2 is reflectivity curve S11, without be transmission curve S21, S21 indicates filtering
Degree of suppression of the device to horizontal axis corresponding frequencies；S11 indicates the reflected intensity of input port, and smaller to illustrate that reflection is weaker, 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 inhibits from 0GHz to 4.4GHz, and upper sideband inhibits from 4.8GHz to 10GHz, inhibits to be greater than 20dB, inhibits side
Band range is very wide, and Out-of-band rejection ultra-wide is super flat, and out-of-band harmonics rejection ability is strong, does not have in conjunction with DGS, SIR, Short-Stub
Or the structures such as Open-Stub inhibit second harmonic.Passband edge due to 0 ° of feed structure and hybrid coupled presence and formed
Two transmission zeros can improve sideband selectivity under the premise of not using cross coupling structure, and combined impedance converts
Dead-center position can also be adjusted flexibly in the case where keeping passband width constant in device.
Claims (2)
1. a kind of micro-strip double-G type narrow band filter, which includes substrate and the microstrip line that is set 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 the G type structure being made of microstrip line, input microstrip line and input coupling is micro-
Exterior bottom connection with line G type structure, input shape and output microstrip line that microstrip line and input coupling microstrip line are constituted and
The shape that output coupling microstrip line is constituted is centrosymmetric, the top end and output coupling of input coupling microstrip line G type structure
The top end of microstrip line G type structure is opposite and is not connected to.
2. a kind of micro-strip double-G type narrow band filter as described in claim 1, it is characterised in that by adjusting input coupling
The distance between the top latter end microstrip line and inside end microstrip line of microstrip line and output coupling microstrip line G type structure are realized
Adjusting to the filter electromagnetic coupling 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 |
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| 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 |
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| Publication Number | Publication Date |
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| CN106848504A CN106848504A (en) | 2017-06-13 |
| CN106848504B true CN106848504B (en) | 2019-06-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 | Miniaturized band-pass filter with many transmission zeros |
| CN204407453U (en) * | 2015-02-06 | 2015-06-17 | 中国计量学院 | Open rectangle ring band stop filter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI353080B (en) * | 2008-03-25 | 2011-11-21 | Ralink Technology Corp | Second order band-pass filter and wireless apparat |
| CN204216189U (en) * | 2014-09-23 | 2015-03-18 | 中国计量学院 | Symmetric double G shape band pass filter |
-
2017
- 2017-04-01 CN CN201710213228.2A patent/CN106848504B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 | Miniaturized band-pass filter with many transmission zeros |
| 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 |
|---|
| 微带超宽带和多通带带通滤波器的研究与设计;程伟;《中国优秀硕士学位论文全文数据库 信息科技辑》;20130415;第23页 * |
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| CN106848504A (en) | 2017-06-13 |
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