CN106169635B - A kind of pocket super-broadband bandpass filter with trap characteristic - Google Patents
A kind of pocket super-broadband bandpass filter with trap characteristic Download PDFInfo
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- CN106169635B CN106169635B CN201610669717.4A CN201610669717A CN106169635B CN 106169635 B CN106169635 B CN 106169635B CN 201610669717 A CN201610669717 A CN 201610669717A CN 106169635 B CN106169635 B CN 106169635B
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- minor matters
- short
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- bandpass 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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20336—Comb or interdigital filters
- H01P1/20345—Multilayer filters
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Abstract
The present invention relates to a kind of pocket super-broadband bandpass filter with trap characteristic, entire filter is made using microstrip line.The microstrip structure includes three layers, respectively upper-layer micro-strip structure, middle level dielectric substrate and lower layer's grounded metal.Upper-layer micro-strip structure includes incoming feeder, output feeder, Coupled Miccrostrip Lines, metallic vias, open circuit minor matters line and two short-circuit minor matters lines；Two short-circuit minor matters lines are connected to the both ends of Coupled Miccrostrip Lines, to generate transmission zero at filter passband both ends, enhance the selectivity of ultra-wide band filter, adjust the length of short-circuit minor matters line and can change the position of transmission zero.The parameters such as line width and the length of open circuit minor matters are adjusted, the frequency range and bandwidth of trap can be flexibly changed.The filter of the present invention can not only ensure that free transmission range covers entire ultra wideband frequency, and can targetedly inhibit the interference frequency component in frequency range, which has simple and compact for structure and function admirable characteristic.
Description
Technical field
The invention belongs to microwave and millimeter wave technical field, especially a kind of pocket super-broadband band logical filter with trap characteristic
Wave device.
Background technology
Federal Communications Commission in 2002 lifts a ban ultra wide band (UWB) associated frequency band positioned at 3.1~10.6GHz.
With the fast development of the Technology of Ultra, to super broad band radio communication electronic equipment, more stringent requirements are proposed, high
Performance, miniaturization have become the inexorable trend of super broad band radio communication system development.In recent ten years, due to it is simple in structure,
The advantages that miniaturization, the ultra-wide band filter of microstrip line construction becomes the Main way of research, and emerges diversified forms
Ultra-wide band filter.
Realize that the ultra wide band characteristic of filter, this filter are easy using high-pass filter and low-pass filter cascade
It realizes, but makes filter size larger since high low pass cascades, it is not compact enough；Traditional quarter-wave short circuit minor matters band
Bandpass filter has the advantages that bandwidth of operation is wide, simple in structure, but this filter Out-of-band rejection ability is poor, to improve this
The selectivity of kind of filter, it is necessary to increase short-circuit minor matters number, or with the open stub of two minor matters replace short circuit transversal with
Two attenuation poles are generated at passband both ends, this method makes the size of filter greatly increase, is unfavorable for the miniaturization of filter.
Therefore, it is still a major challenge to improve the options of ultra-wide band filter and reduce the size of filter, be there is no in the prior art
A kind of simple in structure, pocket super-broadband bandpass filter with trap characteristic of the small high selectivity of size.
Invention content
The object of the present invention is to provide a kind of simple in structure, size is small, high selectivity it is small-sized super with trap characteristic
Broadband band-pass filter.
Realizing the technical solution of the object of the invention is：A kind of pocket super-broadband bandpass filtering with trap characteristic
Device, the structure include three-decker：Upper-layer micro-strip structure, middle level dielectric substrate and lower layer's grounded metal.Upper-layer micro-strip structure is attached
It in the upper surface of interlayer substrate, grounded metal is attached to the lower surface of interlayer substrate.Upper-layer micro-strip structure
Including input and output feeder line, one section of Coupled Miccrostrip Lines, two short-circuit minor matters lines and an open circuit minor matters line.Parallel coupling is micro-
There are two isometric wide short-circuit minor matters line, the ends of short-circuit minor matters to be both provided with metallization and lead to for input/output terminal connection with line
Hole, plated-through hole are connect by middle level dielectric substrate with lower layer ground metal layer from metal overlayer.Coupled Miccrostrip Lines with
Short-circuit minor matters line electrical length having the same, is a quarter of centre frequency corresponding wavelength.Two 50 ohm of input/output
Feeder line is respectively connected to the both ends of parallel coupled line, and an open circuit minor matters are connected to 50 ohm of input and output microstrip line.In order to
The shape of the size for further reducing filter, minor matters of opening a way is bent into " L " shape.
Compared with prior art, remarkable advantage of the invention is：(1) the present invention is based on the short circuits of traditional quarter-wave
Transmission line among short-circuit minor matters line is replaced with one section of parallel coupled line, only passes through level-one by minor matters ultra wide band bandpass filter
Structure achieves that ultra wide band function, greatly reduces the size of filter；(2) present invention passes through short-circuit minor matters and parallel coupling
The connection of line respectively generates a transmission zero at passband both ends, improves the selectivity of filter；(3) present invention utilizes one section
" L " shape open circuit minor matters, generate trap, and can flexibly change the frequency and bandwidth of trap in passband.
The present invention is described in further detail below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 is a kind of planar structure schematic diagram of the pocket super-broadband bandpass filter with trap characteristic of the present invention.
Fig. 2 is that a kind of pocket super-broadband bandpass filter with trap characteristic of the present invention changes with short-circuit minor matters length,
The simulation curve figure of out-of-band transmission Zero change.
Fig. 3 is a kind of pocket super-broadband bandpass filter trap frequency with trap characteristic and bandwidth of the invention with open circuit
The simulation curve figure of minor matters line length variation.
Fig. 4 is a kind of pocket super-broadband bandpass filter frequency response simulation curve figure with trap characteristic of the present invention.
Specific implementation mode
In conjunction with Fig. 1, a kind of pocket super-broadband bandpass filter with trap characteristic of the invention, which includes
Three layers, respectively upper-layer micro-strip structure, middle level dielectric substrate and lower layer's grounded metal, upper-layer micro-strip structure are attached to middle layer Jie
The upper surface of matter substrate, grounded metal are attached to the lower surface of interlayer substrate；Upper-layer micro-strip structure includes parallel coupling
Microstrip line 4, the both ends of the Coupled Miccrostrip Lines 4 are connected with 2 and second short-circuit minor matters 5 of the first short-circuit minor matters respectively, and described the
One short-circuit minor matters, 2 and second short-circuit minor matters 5 are isometric wide, and the end of above-mentioned two short circuit minor matters is respectively provided with short circuit metallicization and leads to
Hole, the short circuit metallic through-hole are connect by dielectric substrate with lower layer ground metal layer, and the two of above-mentioned Coupled Miccrostrip Lines 4
End is also connected with the one 50 ohm of microstrip line 1 and the 2nd 50 ohm microstrip 6 simultaneously, the one 50 ohm of the microstrip line 1
On also set up open circuit minor matters 3.
The Coupled Miccrostrip Lines 4 are equal with the open circuit electrical length of minor matters 3, are four points of centre frequency corresponding wavelength
One of.
The relative dielectric constant of the medium substrate is 10.9, thickness 1.27mm.
The length of the Coupled Miccrostrip Lines 4 is 3.4mm, and width 0.2mm, coupling spacing is 0.1mm.
The length of the open circuit minor matters 3 is 5.5mm, and width W is 0.2mm.
The size of the filter is 9mm × 8mm.
The open circuit minor matters 3 can carry out bending appropriate, in order to further reduce the size of filter, minor matters of opening a way
Shape is bent into " L " shape.Length by adjusting two short-circuit minor matters lines can change the position of filter out-of-band transmission zero
It sets, the frequency and bandwidth of trap can flexibly be changed with width parameter by adjusting the length of open circuit minor matters line.
With reference to embodiment, the present invention will be described in further detail.
Embodiment
A kind of pocket super-broadband bandpass filter with trap characteristic of the present invention using a quarter short circuit minor matters and is put down
The cascade method of row coupling microstrip designs a kind of compact-sized and highly selective ultra wide band bandpass filter, increases open circuit branch
Section makes filter have trap characteristic, can filter out the interference of wireless network.The centre frequency of bandpass filter selected by the present invention
For 6.85GHz, passband frequency range 3.1GHz-10.6GHz, relative bandwidth reaches 110%.50 ohm microstrips of metal overlayer
Line (1), the input/output port of (6) as energy, the width of the microstrip line are determined as 1.2mm by the centre frequency of filter,
Length is adjusted according to actual needs, and the present invention selects 2mm.The length of Coupled Miccrostrip Lines is 3.4mm, and width is
0.2mm, coupling spacing are 0.1mm.In order to illustrate the variation relation of the length and out-of-band transmission zero of short-circuit minor matters, to different
Short-circuit minor matters length is emulated, as can be seen from Figure 2, the position of the transmission zero of upper side band with short-circuit minor matters length increasing
Greatly, attenuation pole is moved at centre frequency.After final optimization pass, the length of short-circuit minor matters is 3.9mm, width 0.4mm.
It is 0.3mm that the diameter in hole is connected in the metallization of two short-circuit minor matters ends.Pass through this hair of the length specification of change open circuit minor matters
The adjustability of the trap frequency and bandwidth of a kind of bright pocket super-broadband bandpass filter with trap characteristic.It can be with from Fig. 3
Find out, with the increase of open stub length, the frequency range of trap can be moved to low-frequency range, therefore by adjusting open circuit minor matters
Length can easily adjust notch band.The present invention couple 5.8~5.9GHz frequency ranges carry out trap, corresponding open stub
Length be 5.5mm, width W be 0.2mm.
In conjunction with Fig. 4, frequency characteristic includes：S21 (insertion loss), S11 (return loss).Abscissa is frequency component, single
Position is GHz, and ordinate is that frequency characteristic includes insertion loss and return loss, unit dB.Simulation result shows：The filter
Free transmission range be 3.1~10.6GHz, trap frequency is 5.7~5.8GHz, and the maximum suppression of trap reached -49dB.
In 3.1~4.9GHz and 6.4~10.6GHz, insertion loss is less than 1dB.Sideband rejection ability is stronger, is reached at 11.9GHz
To the decaying of -40dB.Return loss is ideal in two free transmission ranges, and the design for meeting ultra wide band bandpass filter is wanted
It asks.Meanwhile the size of entire filter is only 9mm × 8mm.
A kind of pocket super-broadband bandpass filter with trap characteristic proposed by the present invention only passes through two short-circuit minor matters
It is connect with one section of parallel coupled line, on the one hand realizes ultra wide band characteristic using simple structure, on the other hand also produced outside passband
Raw two transmission zeros, enhance the Out-of-band rejection ability of filter；It is fallen into addition, being generated in passband by addition open circuit minor matters
Wave frequency section, and the length-flexible for the minor matters line that can be opened a way by adjusting changes the frequency spectrum and bandwidth of trap, filters out the dry of wireless network
It disturbs.The configuration of the present invention is simple is compact, function admirable, easily fabricated and production.
Claims (6)
1. a kind of pocket super-broadband bandpass filter with trap characteristic, which is characterized in that pocket super-broadband bandpass filter
Including three layers, respectively upper-layer micro-strip structure, middle level dielectric substrate and lower layer's grounded metal, upper-layer micro-strip structure are attached to centre
The upper surface of layer dielectric substrate, grounded metal are attached to the lower surface of interlayer substrate；Upper-layer micro-strip structure includes parallel
Coupled microstrip line (4), the both ends of the Coupled Miccrostrip Lines (4) respectively with the first short-circuit minor matters (2) and the second short circuit minor matters (5)
It is connected, the first short-circuit minor matters (2) and the second short-circuit minor matters (5) are isometric wide, above-mentioned first short circuit minor matters (2) and second short
The end of road minor matters (5) is respectively provided with short circuit metallic through-hole, and the short circuit metallic through-hole is grounded by dielectric substrate and lower layer
Metal layer connects, the both ends of above-mentioned Coupled Miccrostrip Lines (4) simultaneously also with the one 50 ohm of microstrip line (1) and the 2nd 50 Europe
Nurse microstrip line (6) is connected, and open circuit minor matters (3) are also set up on described one 50 ohm of microstrip line (1).
2. the pocket super-broadband bandpass filter according to claim 1 with trap characteristic, which is characterized in that parallel coupling
It is equal with the electrical length of open circuit minor matters (3) to close microstrip line (4), is a quarter of centre frequency corresponding wavelength.
3. the pocket super-broadband bandpass filter according to claim 1 with trap characteristic, which is characterized in that medium base
The relative dielectric constant of plate is 10.9, thickness 1.27mm.
4. the pocket super-broadband bandpass filter according to claim 1 with trap characteristic, which is characterized in that parallel coupling
The length for closing microstrip line (4) is 3.4mm, and width 0.2mm, coupling spacing is 0.1mm.
5. the pocket super-broadband bandpass filter according to claim 1 with trap characteristic, which is characterized in that open circuit branch
The length for saving (3) is 5.5mm, and width W is 0.2mm.
6. the pocket super-broadband bandpass filter according to claim 1 with trap characteristic, which is characterized in that filter
Size be 9mm × 8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610669717.4A CN106169635B (en) | 2016-08-13 | 2016-08-13 | A kind of pocket super-broadband bandpass filter with trap characteristic |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610669717.4A CN106169635B (en) | 2016-08-13 | 2016-08-13 | A kind of pocket super-broadband bandpass filter with trap characteristic |
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| Publication Number | Publication Date |
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| CN106169635A CN106169635A (en) | 2016-11-30 |
| CN106169635B true CN106169635B (en) | 2018-10-12 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069158B (en) * | 2017-01-09 | 2019-04-19 | 华东交通大学 | A kind of broadband band-pass filter with trap characteristic |
| CN106961013B (en) * | 2017-03-21 | 2019-06-18 | 南通大学 | A kind of dipole antenna of low section |
| CN107196024A (en) * | 2017-04-15 | 2017-09-22 | 深圳市景程信息科技有限公司 | Broadband band-pass filter with broadband Out-of-band rejection |
| CN107464969A (en) * | 2017-08-03 | 2017-12-12 | 重庆邮电大学 | A kind of controllable Microstrip Low-Pass of transmission zero |
| CN107359393B (en) * | 2017-08-21 | 2020-10-02 | 广西师范大学 | Ultra-wideband microstrip band-pass filter |
| CN109301409A (en) * | 2018-09-07 | 2019-02-01 | 北京信息科技大学 | A kind of bandpass filter based on resonator based on via structure |
| CN110380169B (en) * | 2019-06-27 | 2020-11-13 | 南京理工大学 | Trapped wave frequency adjustable ultra-wideband filter with improved band elimination characteristic |
| CN110707401B (en) * | 2019-09-27 | 2021-10-19 | 南京邮电大学 | Coupling line loading low-pass or band-stop filter with reconfigurable transmission response |
| CN110676543B (en) * | 2019-09-27 | 2021-10-19 | 南京邮电大学 | External loading type low-pass and band-stop microwave transmission line filter of coupling line with reconfigurable transmission response |
| CN111029694A (en) * | 2019-12-09 | 2020-04-17 | 瑞声科技(新加坡)有限公司 | Microstrip filter |
| CN111144033A (en) * | 2020-01-15 | 2020-05-12 | 河南师范大学 | Design method of high-selectivity broadband band-pass filter |
| CN115954634B (en) * | 2023-03-09 | 2023-05-23 | 四川太赫兹通信有限公司 | Dual-band pass filter with small frequency ratio |
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| CN105762465A (en) * | 2016-04-07 | 2016-07-13 | 重庆邮电大学 | Miniaturized ultra wide band filter with two-notch features |
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| KR100576773B1 (en) * | 2003-12-24 | 2006-05-08 | 한국전자통신연구원 | Microstrip band pass filter using end-coupled SIRs |
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| CN102255125A (en) * | 2010-09-21 | 2011-11-23 | 上海大学 | Novel double-frequency narrow-band bandpass filter |
| CN105762465A (en) * | 2016-04-07 | 2016-07-13 | 重庆邮电大学 | Miniaturized ultra wide band filter with two-notch features |
Non-Patent Citations (1)
| Title |
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| "Ultra-wideband(UWB) bandpass filters using multiple-mode resonator";Lei Zhu et al;《IEEE Microwave and Wireless Components Letters》;20051130;第15卷(第11期);第796-798页 * |
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