CN105337005B - A kind of three mould broadband band-pass filter of plane - Google Patents
A kind of three mould broadband band-pass filter of plane Download PDFInfo
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- CN105337005B CN105337005B CN201510849297.3A CN201510849297A CN105337005B CN 105337005 B CN105337005 B CN 105337005B CN 201510849297 A CN201510849297 A CN 201510849297A CN 105337005 B CN105337005 B CN 105337005B
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Abstract
The invention discloses a kind of three mould broadband band-pass filter of plane, including underlying metal floor, interlayer substrate and upper strata metallic circuit, it is characterised in that：Upper strata metallic circuit includes the first feeding network, annular three mould resonator circuits and the second feeding network；The annular three moulds resonator circuit includes uniform transmission line ten, uniform transmission line 11, uniform transmission line 12, uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 and uniform transmission line 16；The uniform transmission line 12, uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 form straight-flanked ring, and the uniform transmission line 16 is connected with uniform transmission line 12 and on the plane of symmetry of three mould resonators.The present invention realizes three modes of resonance in passband frequency range, has good reflection and transmission characteristic in broadband filter passband, and wave filter has upper passband selectivity.
Description
Technical field
The present invention relates to the radio-frequency filter fields in wireless communication, and in particular to a kind of with the flat of upper passband selectivity
Three mould broadband band-pass filter of face.
Background technology
With the continuous development of wireless communication technique, carried out at a high speed between the WLAN and home network of miniaturization
The demand of data sharing and transmission is more and more important, this causes short-range broadband wireless communications to develop as future wireless system
Important development direction.Broadband connections is a kind of no-load wave communication, and the signal of extremely low power can be transmitted on wider frequency spectrum,
High with transmission rate, strong antijamming capability, power is low, and system structure simply waits many advantages.
Due to good characteristics and wide application prospect that broadband connections has, the component related with broadband connections and system are ground
Rapid development is made, as one of Primary Component in wide-band communication system, broadband filter also obtains domestic and international industrial quarters
With academia's extensive concern.Two major classes are broadly divided into currently for the design method of broadband filter：High pass, low-pass filter stage
Connection is designed and designed based on multimode resonator.Wherein, by the way that high-pass filter and low-pass filter cascade design broadband are filtered
Ripple device, circuit size is bigger than normal after cascade, and the pass band insertion loss brought by cascade can also become larger therewith, is unfavorable for actual system
Highly integrated and low-loss demand in system.The scholars such as 2005 years of jubilation thunders are put forward for the first time the three mould resonance based on step electric impedance resonator
Technology is simultaneously applied in ultra-wide band filter design, and thereafter, the broadband filter design method based on multimode resonator is continuous
It proposes.A kind of multimode broadband filtering that square resonant ring is loaded based on racemosus section is disclosed in patent of invention CN103187601A
Device, by load minor matters control realize three Mould Breadths band resonance characteristic, broadband band-pass filter have good pass band transfer and
Reflection characteristic, but the selectivity of entire passband is very gentle, is applied in actual wide-band communication system easy and near by frequency
Signal generates interference；The patent of invention of Patent No. CN103855450A proposes a kind of micro-strip based on four mould toroidal cavity resonators
Broadband filter, tool there are four mode of resonance, respectively draw by loop configuration both sides above and below passband in filter passband frequency range
Enter a transmission zero, greatly improve the selectivity of passband, but return loss is only in the broadband filter passband realized
It better than -8dB, causes in passband that transmission loss fluctuation is larger, is unfavorable for the uniform flat transmission of broadband signal.
The content of the invention
To solve deficiency of the prior art, the present invention provides a kind of three mould broadband band-pass filter of plane, solves existing
There are three mould resonant transmissions and wave filter upper passband selective problems in broadband filter implementation.
In order to realize above-mentioned target, the present invention adopts the following technical scheme that：A kind of three mould broadband band-pass filter of plane, bag
Include underlying metal floor, interlayer substrate and upper strata metallic circuit, it is characterised in that：Upper strata metallic circuit includes first
Feeding network, annular three mould resonator circuits and the second feeding network；First feeding network by uniform transmission line four, uniformly
Transmission line six and uniform transmission line seven form, and one end of the uniform transmission line four is connected with external circuit, the other end with uniformly
Transmission line six is connected with uniform transmission line seven, and uniform transmission line six is parallel with uniform transmission line seven；
Second feeding network is made of uniform transmission line five, uniform transmission line eight and uniform transmission line nine, is uniformly passed
One end of defeated line five is connected with external circuit, and the other end is connected with uniform transmission line eight and uniform transmission line nine, eight He of transmission line
Uniform transmission line nine is parallel；
The annular three moulds resonator circuit include uniform transmission line ten, uniform transmission line 11, uniform transmission line 12,
Uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 and uniform transmission line 16；The uniform transmission line ten
2nd, uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 form straight-flanked ring, the uniform transmission line 16
It is connected with uniform transmission line 12 and on the plane of symmetry of three mould resonators；The uniform transmission line ten and uniform transmission line ten
Two one end is connected, and between uniform transmission line six and uniform transmission line seven；The uniform transmission line 11 is with uniformly passing
The other end of defeated line 12 is connected, and between uniform transmission line eight and uniform transmission line nine；
Uniform transmission line ten, uniform transmission line 11, uniform transmission line 13, uniform transmission line 14 and uniform transmission line
16 length is identical, and the length of uniform transmission line 12 and uniform transmission line 15 is less than 0.5 times of uniform transmission line 16
Length；
A kind of foregoing three mould broadband band-pass filter of plane, it is characterized in that：The plane of symmetry of the three moulds resonator be with
Uniform transmission line 12 is perpendicular to and at the plane among uniform transmission line 12.
A kind of foregoing three mould broadband band-pass filter of plane, it is characterized in that：The uniform transmission line ten, uniform transmission line
Six and seven three of uniform transmission line be mutually parallel, formed together with uniform transmission line four first input/output end port coupling feedback
Electric network；First input/output end port is located at the junction of uniform transmission line four and external circuit.
A kind of foregoing three mould broadband band-pass filter of plane, it is characterized in that：The uniform transmission line 11, uniform transmission
Line eight and nine three of uniform transmission line are parallel to each other, and the coupling of the second input/output end port is formed together with uniform transmission line five
Feeding network；Second input/output end port is located at the junction of uniform transmission line five and external circuit.
The advantageous effect that the present invention is reached：
1st, simple in structure, compact dimensions, the present invention is made of couple feed network and three mould resonators, resonator structure letter
Single, circuit size is small；
2nd, mode of resonance is easily controllable, and the present invention loads three mould resonators using minor matters and realizes broadband filter design, can
To have in the passband frequency range of broadband there are three mode of resonance, passband is interior to have preferably transmission and reflection characteristic.
3rd, upper passband selection characteristic, the three mould resonator of annular in the present invention, annular two-way gauge structure can be in passband
Downside generate a transmission zero, the open circuit minor matters loaded on the plane of symmetry can introduce one in the upside of passband and transmit zero
Point, two zero points greatly improve the passband selectivity of broadband filter.
4th, easy of integration, the broadband filter in the present invention is easily integrated using planar circuit structure.
5th, inexpensive, the broadband filter structure designed by the invention is only by the additional double layer of metal face up and down of single-layer medium plate
It forms, therefore traditional PCB processing technologys may be employed, board cost and processing cost are low.
Description of the drawings
Fig. 1 is the structure diagram of broadband filter of the present invention；
Fig. 2 is the upper-layer micro-strip structure schematic diagram of broadband filter of the present invention；
Fig. 3 is frequency response curve of the three mould resonators of broadband filter embodiment 1 of the present invention when weak coupling encourages
Schematic diagram；
Fig. 4 is the frequency response curve schematic diagram of 1 broadband filter of the embodiment of the present invention.
Fig. 5 is frequency response curve of the three mould resonators of broadband filter embodiment 2 of the present invention when weak coupling encourages
Schematic diagram；
Fig. 6 is the frequency response curve schematic diagram of 2 broadband filter of the embodiment of the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and be not intended to limit the protection scope of the present invention and limit the scope of the invention.
As shown in Figure 1, the three mould broadband band-pass filter of plane of the present invention, including underlying metal floor 1, interlayer
Substrate 2 and upper strata metallic circuit 3；
Upper strata metallic circuit 3 includes the first feeding network, annular three mould resonator circuits and the second feeding network；Described
One feeding network is made of uniform transmission line 44, uniform transmission line 66 and uniform transmission line 77, and the one of uniform transmission line 44
End is connected with external circuit, and the other end is connected with uniform transmission line 66 and uniform transmission line 77；Second feeding network by
Uniform transmission line 55, uniform transmission line 88 and uniform transmission line 99 form, one end of uniform transmission line 55 and external circuit
It is connected, the other end is connected with uniform transmission line 88 and uniform transmission line 99；Annular three mould resonator circuits are by uniform transmission line
10, uniform transmission line 11, uniform transmission line 12, uniform transmission line 13, uniform transmission line 14, uniformly
Transmission line 15 and uniform transmission line 16 form.
Uniform transmission line 12, uniform transmission line 13, uniform transmission line 14,15 structure of uniform transmission line
Rectangular ring, uniform transmission line 16 are connected with uniform transmission line 12 and on the planes of symmetry of three mould resonators；
Even transmission line 10 is connected with 12 one end of uniform transmission line, and positioned at uniform transmission line 66 and uniform transmission line 77 it
Between；The uniform transmission line 11 is connected with the other end of uniform transmission line 12, and positioned at uniform transmission line 88 and
Between even transmission line 99.
Perpendicular to and at the face among uniform transmission line 12 it is three moulds with uniform transmission line 12 in said program
The plane of symmetry of resonator and the plane of symmetry of upper strata metallic circuit.
Uniform transmission line 10 is located at the centre of uniform transmission line 66 and uniform transmission line 77, and three is mutually parallel, with
Uniform transmission line 44 forms the couple feed network of the first input/output end port together；Uniform transmission line 11 is located at uniform
The centre of transmission line 88 and uniform transmission line 99, three is parallel to each other, together with uniform transmission line 55 form second input/
The couple feed network of output port；First input/output end port is located at uniform transmission line 44 and external circuit junction, the
Two input/output end ports are located at uniform transmission line 55 and external circuit junction, the couple feed of the first input/output end port
The couple feed network of network and the second input/output end port is symmetrical on the plane of symmetry of three mould resonators；
In annular three mould resonator circuits composition structure, uniform transmission line 12, uniform transmission line 13 uniformly pass
Defeated line 14, uniform transmission line 15 and uniform transmission line 16 form annular dual path circuit, which can be
The downside of passband generates a transmission zero, and the open circuit minor matters loaded on the plane of symmetry of three mould resonators can be in the upside of passband
A transmission zero is introduced, the passband selection performance of three Mould Breadth band filters is greatly improved in two zero points.
Three modes of resonance of annular three mould resonator circuits can pass through uniform transmission line 10, uniform transmission line 11
11st, uniform transmission line 12, uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 and uniformly
Transmission line 16 controls, wherein, uniform transmission line 10, uniform transmission line 11, uniformly uniform transmission line 13, biography
Defeated line 14 is identical with the length of uniform transmission line 16, the length of uniform transmission line 12 and uniform transmission line 15
Degree is less than 0.5 times of length of uniform transmission line 16 so that three modes of resonance are evenly distributed on passband design frequency range
It is interior, it is ensured that three designed Mould Breadth band filters have good pass band transfer and reflection characteristic.
Medium substrate is Rogers RT/duroid 4003 used by the broadband filter of the present embodiment, and thickness is
0.508mm, metal covering are copper foil, copper thickness 0.02mm.
Embodiment one：Uniform transmission line ten, uniform transmission line 11, uniform transmission line 13,14 and of uniform transmission line
The length of uniform transmission line 16 is identical, and the length of uniform transmission line 12 and uniform transmission line 15 is equal to uniform transmission line ten
Six 0.1 times of length；
Fig. 3 is transmission coefficient response of the three mould resonators under weak coupling excitation, and three mode of resonance approaches uniformities are distributed,
And respectively there are one transmission zeros on the downside of first pattern and on the upside of the 3rd pattern.
Fig. 4 is the frequency response curve schematic diagram of broadband filter, i.e. transmission coefficient amplitude | S21| and reflectance magnitude |
S11| frequency response results.The centre frequency of broadband filter design is WLAN5.2GHz, and 3dB relative bandwidths are 35%, and band is interior to return
Ripple loss is better than -15dB, and the minimum 0.3dB of insertion loss, passband is interior there are three reflection zero, and entire passband has excellent biography
Defeated and reflection characteristic.In addition, each at 4.0GHz and 6.6GHz, there are one transmission zeros so that the three mould wideband filtereds invented
Utensil has good passband selectivity.
Embodiment two, uniform transmission line ten, uniform transmission line 11, uniform transmission line 13,14 and of uniform transmission line
The length of uniform transmission line 16 is identical, and the length of uniform transmission line 12 and uniform transmission line 15 is equal to uniform transmission line ten
Six 0.5 times of length；
Fig. 5 is transmission coefficient response of the three mould resonators under weak coupling excitation, and three mode of resonance approaches uniformities are distributed,
And there are one transmission zero on the downside of first pattern, but in the embodiment, the zero point on the upside of the 3rd pattern is buried in oblivion, this be by
The superposition of circular path two paths of signals causes the effect that zero point disappears under the path.
Fig. 6 is the frequency response curve schematic diagram of broadband filter, i.e. transmission coefficient amplitude | S21| and reflectance magnitude |
S11| frequency response results.The centre frequency of broadband filter design is WLAN5.2GHz, and 3dB relative bandwidths are 46%, and band is interior to return
Ripple loss is better than -9dB, the minimum 0.8dB of insertion loss.There are one transmission zero at 3.9GHz, filter passband is improved
Upper edge selectivity.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (4)
1. a kind of three mould broadband band-pass filter of plane, including underlying metal floor, interlayer substrate and upper strata metal
Circuit, it is characterised in that：Upper strata metallic circuit includes the first feeding network, annular three mould resonator circuits and the second transmission network
Network；First feeding network is made of uniform transmission line four, uniform transmission line six and uniform transmission line seven, the uniform transmission
One end of line four is connected with external circuit, and the other end is connected with uniform transmission line six and uniform transmission line seven, uniform transmission line six
It is parallel with uniform transmission line seven；
Second feeding network is made of uniform transmission line five, uniform transmission line eight and uniform transmission line nine, uniform transmission line
Five one end is connected with external circuit, and the other end is connected with uniform transmission line eight and uniform transmission line nine, transmission line eight and uniformly
Transmission line nine is parallel；
The annular three moulds resonator circuit include uniform transmission line ten, uniform transmission line 11, uniform transmission line 12, uniformly
Transmission line 13, uniform transmission line 14, uniform transmission line 15 and uniform transmission line 16；The uniform transmission line 12,
Uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 form straight-flanked ring, the uniform transmission line 16 with
Even transmission line 12 is connected and on the plane of symmetry of three mould resonators, and uniform transmission line sixteen bit is in straight-flanked ring；It is described
Uniform transmission line ten is connected with one end of uniform transmission line 12, and between uniform transmission line six and uniform transmission line seven；
The uniform transmission line 11 is connected with the other end of uniform transmission line 12, and positioned at uniform transmission line eight and uniform transmission line
Between nine；
Uniform transmission line ten, uniform transmission line 11, uniform transmission line 13, uniform transmission line 14 and uniform transmission line 16
Length it is identical, the length of uniform transmission line 12 and uniform transmission line 15 is less than 0.5 times of length of uniform transmission line 16.
2. three mould broadband band-pass filter of a kind of plane according to claim 1, it is characterized in that：The three moulds resonator
The plane of symmetry is perpendicular to and at the plane among uniform transmission line 12 with uniform transmission line 12.
3. three mould broadband band-pass filter of a kind of plane according to claim 1, it is characterized in that：The uniform transmission line
Tenth, uniform transmission line six and seven three of uniform transmission line are mutually parallel, and the first input/output is formed together with uniform transmission line four
The couple feed network of port；First input/output end port is located at the junction of uniform transmission line four and external circuit.
4. three mould broadband band-pass filter of a kind of plane according to claim 1, it is characterized in that：The uniform transmission line ten
First, uniform transmission line eight and nine three of uniform transmission line are parallel to each other, and the second input/output is formed together with uniform transmission line five
The couple feed network of port；Second input/output end port is located at the junction of uniform transmission line five and external circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510849297.3A CN105337005B (en) | 2015-11-27 | 2015-11-27 | A kind of three mould broadband band-pass filter of plane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510849297.3A CN105337005B (en) | 2015-11-27 | 2015-11-27 | A kind of three mould broadband band-pass filter of plane |
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| CN105337005A CN105337005A (en) | 2016-02-17 |
| CN105337005B true CN105337005B (en) | 2018-05-29 |
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| CN107134616A (en) * | 2017-06-22 | 2017-09-05 | 南京信息工程大学 | A kind of mode filter of micro-strip five |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203871450U (en) * | 2014-05-20 | 2014-10-08 | 中国科学院微电子研究所 | Ultra wide band band-pass filter having trapped wave point |
| CN205282619U (en) * | 2015-11-27 | 2016-06-01 | 南京信息工程大学 | Three mould broadband band -pass filter on plane |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4155576B2 (en) * | 2004-04-01 | 2008-09-24 | 国立大学法人東京工業大学 | Ring filter and wideband bandpass filter using the same |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203871450U (en) * | 2014-05-20 | 2014-10-08 | 中国科学院微电子研究所 | Ultra wide band band-pass filter having trapped wave point |
| CN205282619U (en) * | 2015-11-27 | 2016-06-01 | 南京信息工程大学 | Three mould broadband band -pass filter on plane |
Non-Patent Citations (1)
| Title |
|---|
| "Wideband Bandpass Filter Using Open Stub Loaded Square Ring";Cong Tang等;《wireless symposium（IWS）》;20150401;1-3 * |
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Address after: 210019 No. 219 Ningliu Road, Jiangbei New District, Nanjing City, Jiangsu Province Patentee after: NANJING University OF INFORMATION SCIENCE & TECHNOLOGY Address before: The Olympic Avenue in Jianye District of Nanjing city of Jiangsu Province, No. 69 210019 Patentee before: NANJING University OF INFORMATION SCIENCE & TECHNOLOGY |
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Effective date of registration: 20211115 Address after: 225200 Zhanggang Industrial Park, economic development zone, Jiangdu District, Yangzhou City, Jiangsu Province Patentee after: Yangzhou Spack Industrial Co., Ltd Address before: No. 219, ningliu Road, Jiangbei new district, Nanjing, Jiangsu 210019 Patentee before: Nanjing University of Information Engineering |