CN104934663A - Broadband high-selectivity balanced band-pass filter based on multimode resonators - Google Patents
Broadband high-selectivity balanced band-pass filter based on multimode resonators Download PDFInfo
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Abstract
The present invention discloses a broadband high-selectivity balanced band-pass filter based on multimode resonators. The band-pass filter comprises an input port feeder, a first output port feeder, a second output port feeder, a first multimode resonator and a second multimode resonator which are arranged on the upper surface of a dielectric substrate, and a metal earth plate arranged on the lower surface of the dielectric substrate, wherein both the first and second multimode resonators are symmetric stub-loaded multimode resonators; wherein the input port feeder comprises symmetrically connected first and second input port feeders; the first multimode resonator comprises two quarter-wave resonators, and three open-ended symmetric loading units; the second multimode resonator comprises two quarter-wave resonators, and three open-ended symmetric loading units. The broadband balanced band-pass filter according to the present invention has advantages such as broad stopband, minimized size, high common-mode rejection, high selectivity and low costs, and is quite suitable for modern wireless communication systems.
Description
Technical field
The present invention relates to microwave passive component technical field, particularly a kind of broadband high selectivity balancing band bandpass filter based on multimode resonator.
Background technology
In recent years, along with modular structural units (Modular Building Block, and monolithic integrated microwave circuit (Monolithic Microwave Integrated Circuit MBB), MMIC) development, low cost, highly integrated, miniaturization have become very important Consideration in modern wireless communication systems Integrated design.Balance filter is an independently microwave passive component, higher ambient noise immunity, better dynamic range, lower electric jamming is had than single port filter, balance filter to achieve in radio circuit differential mode signal transmission in free transmission range, the function that common-mode signal suppresses, therefore plays extremely important effect in structure Modern High-Speed wireless communication system.High performance balance filter can not only effectively reduce the size of system, and can simplify the complexity of system, thus realizes low cost, high-performance, the Miniaturization Design of wireless communication system further.
2010, Jin Shi and Quan Xue is at IEEE Transaction.Microwave Theory Technique periodical (vol.58, no.4, pp.970-977,2010) delivering on " Balanced Bandpass Filters Using Center-LoadedHalf-Wavelength Resonators ", proposing the method for designing by using 1/2nd wave resonator of center loaded to realize balance filter.Although this method for designing design theory is comparatively simple, because this structure needs to load lamped element, make structure processed complex, error increases.Narrower from the bandwidth of outer designed balance filter, 3dB relative bandwidth only has 8.92%.
2012, Wenjie Feng and Wenquan Che is at IEEE Transaction.Microwave TheoryTechnique periodical (vol.60, no.6, pp.1560-1568,2012) deliver on " Novel Wideband DifferentialBandpass Filters Based on T-Sharped Structure ", propose to realize the Differential Output of signal and the bandpass characteristics of bimodulus based on T-type structure, although this method for designing structure is comparatively simple, but common mode inhibition effect is only 14.5dB, and differential mode Out-of-band rejection is poor.
2013, Paris V é lez, Jordi Naqui, A.Fern á ndez-Prieto, Miguel Dur á n-Sindreu, JordiBonache, Jes ú s Martel, Francisco Medina, Ferran Mart í n is at IEEE Microwave And WirelessComponents Letters periodical (vol.23, no.1, pp.22-24, 2013) deliver on " Differential Bandpass FilterWith Common-Mode Suppression Based on Open Split Ring Resonators and OpenComplementary Split Ring Resonators ", propose to be combined open circuit ring and auxiliary open ring carrys out the method for design balance filter.Although this design does not need ground hole, structure is relatively simple, and common mode inhibition is only confined in corresponding differential mode frequency band, and the Out-of-band rejection of common and different mode is all very poor, and insertion loss is large.
Summary of the invention
The object of the present invention is to provide a kind of broadband high selectivity balancing band bandpass filter based on multimode resonator with characteristics such as miniaturization, high common mode inhibition, high selectivity, low-losses.
The technical solution realizing the object of the invention is: a kind of broadband high selectivity balancing band bandpass filter based on multimode resonator, comprise the input port feeder line, the first output port feeder line, the second output port feeder line, the first multimode resonator, the second multimode resonator that are positioned at medium substrate upper surface and be positioned at the metal ground plate of medium substrate lower surface, wherein the first multimode resonator and the second multimode resonator are plane of symmetry minor matters loaded type multimode resonator; Input port feeder line comprises first input end mouth 50 ohm microstrip conduction band, first input end mouth quarter-wave main transmission line, the second input port quarter-wave main transmission line, the second input port 50 ohm microstrip conduction band; First output port feeder line comprises the first output port 50 ohm microstrip conduction band and the first output port quarter-wave coupling line; Second output port feeder line comprises the second output port 50 ohm microstrip conduction band and the second output port quarter-wave coupling line; First multimode resonator comprises the first quarter-wave resonance device, the second quarter-wave resonance device, the first plane of symmetry minor matters loading unit, the second plane of symmetry minor matters loading unit and the 3rd plane of symmetry minor matters loading unit; Second multimode resonator comprises the 3rd quarter-wave resonance device, the 4th quarter-wave resonance device, the 4th plane of symmetry minor matters loading unit, the 5th plane of symmetry minor matters loading unit and hexasymmetric faces minor matters loading unit.
Further, the first input end mouth quarter-wave main transmission line of described input port feeder line and the first quarter-wave resonance device parallel coupling of the first multimode resonator; 3rd quarter-wave resonance device parallel coupling of the second input port quarter-wave main transmission line and the second multimode resonator; Second quarter-wave resonance device parallel coupling of the first output port quarter-wave coupling line and the first multimode resonator; 4th quarter-wave resonance device parallel coupling of the second output port quarter-wave coupling line and the second multimode resonator.
Further, the first input end mouth 50 ohm microstrip conduction band of described input port feeder line and the second input port 50 ohm microstrip conduction band measure-alike; First input end mouth quarter-wave main transmission line and the second input port quarter-wave main transmission line measure-alike; First output port feeder line is identical with the physical dimension of the second output port feeder line, and the first multimode resonator and the second multimode resonator are the identical plane of symmetry minor matters of physical dimension and load multimode resonator.
Further, first quarter-wave resonance device of described first multimode resonator and the second quarter-wave resonance device are interconnected by vertical line near one end of first input end mouth 50 ohm microstrip conduction band, first plane of symmetry minor matters loading unit, second plane of symmetry minor matters loading unit, 3rd plane of symmetry minor matters loading unit and the first quarter-wave resonance device, second quarter-wave resonance device is parallel to each other distribution, first plane of symmetry minor matters loading unit is identical with the 3rd plane of symmetry minor matters loading unit physical dimension and be symmetrically distributed in the second plane of symmetry minor matters loading unit both sides, 3rd quarter-wave resonance device of the second multimode resonator and the 4th quarter-wave resonance device are interconnected by vertical line near one end of the second input port 50 ohm microstrip conduction band, 4th plane of symmetry minor matters loading unit, 5th plane of symmetry minor matters loading unit, hexasymmetric faces minor matters loading unit and the 3rd quarter-wave resonance device, 4th quarter-wave resonance device is parallel to each other distribution, 4th plane of symmetry minor matters loading unit is identical with hexasymmetric faces minor matters loading unit physical dimension and be symmetrically distributed in the 5th plane of symmetry minor matters loading unit both sides.
Compared with prior art, its remarkable advantage is in the present invention: (1) structure is simple, and can realize on monolithic pcb board, be convenient to process, production cost is low; (2) utilize the resonance mechanism of multimode resonator and the electric field distribution characteristic of main transmission line, there is the advantage of high selectivity, broad passband, good differential mode transmission, high common mode inhibition; (3) selectivity is good, insertion loss is little, is applicable to modern wireless communication systems.
Accompanying drawing explanation
Fig. 1 is the perspective view of the broadband high selectivity balancing band bandpass filter that the present invention is based on multimode resonator.
Fig. 2 is the plan structure schematic diagram of the broadband high selectivity balancing band bandpass filter that the present invention is based on multimode resonator.
Fig. 3 is the physical dimension schematic diagram of the broadband high selectivity balancing band pass filter embodiments 1 that the present invention is based on multimode resonator.
Fig. 4 is the S parameter analogous diagram of the broadband high selectivity balancing band pass filter embodiments 1 that the present invention is based on multimode resonator.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Composition graphs 1 ~ 2, the present invention is based on the broadband high selectivity balancing band bandpass filter of multimode resonator, comprise the input port feeder line 1 being positioned at medium substrate 6 upper surface, first output port feeder line 2, second output port feeder line 3, first multimode resonator 4, second multimode resonator 5 and the metal ground plate 7 being positioned at medium substrate 6 lower surface, wherein the first multimode resonator 4 and the second multimode resonator 5 equal 1, a kind of broadband high selectivity balancing band bandpass filter based on multimode resonator, it is characterized in that: comprise the input port feeder line 1 being positioned at medium substrate 6 upper surface, first output port feeder line 2, second output port feeder line 3, first multimode resonator 4, second multimode resonator 5 and the metal ground plate 7 being positioned at medium substrate 6 lower surface, wherein the first multimode resonator 4 and the second multimode resonator 5 are plane of symmetry minor matters loaded type multimode resonator, input port feeder line 1 comprises first input end mouth 50 ohm microstrip conduction band 11, first input end mouth quarter-wave main transmission line 12, second input port quarter-wave main transmission line 13, second input port 50 ohm microstrip conduction band 14, first output port feeder line 2 comprises the first output port 50 ohm microstrip conduction band 21 and the first output port quarter-wave coupling line 22, second output port feeder line 3 comprises the second output port 50 ohm microstrip conduction band 31 and the second output port quarter-wave coupling line 32, first multimode resonator 4 comprises the first quarter-wave resonance device 41, second quarter-wave resonance device 42, first plane of symmetry minor matters loading unit 43, second plane of symmetry minor matters loading unit 44 and the 3rd plane of symmetry minor matters loading unit 45, second multimode resonator 5 comprises the 3rd quarter-wave resonance device 51, the 4th quarter-wave resonance device 52, the 4th plane of symmetry minor matters loading unit the 53, the 5th plane of symmetry minor matters loading unit 54 and hexasymmetric faces minor matters loading unit 55.
The first input end mouth quarter-wave main transmission line 12 of described input port feeder line 1 and the first quarter-wave resonance device 41 parallel coupling of the first multimode resonator 4; 3rd quarter-wave resonance device 51 parallel coupling of the second input port quarter-wave main transmission line 13 and the second multimode resonator 5; Second quarter-wave resonance device 42 parallel coupling of the first output port quarter-wave coupling line 22 and the first multimode resonator 4; 4th quarter-wave resonance device 52 parallel coupling of the second output port quarter-wave coupling line 32 and the second multimode resonator 5.
The first input end mouth 50 ohm microstrip conduction band 11 of described input port feeder line 1 and the second input port 50 ohm microstrip conduction band 14 measure-alike; First input end mouth quarter-wave main transmission line 12 and the second input port quarter-wave main transmission line 13 measure-alike; First output port feeder line 2 is identical with the physical dimension of the second output port feeder line 3, and the first multimode resonator 4 and the second multimode resonator 5 are the identical plane of symmetry minor matters of physical dimension and load multimode resonator.
First quarter-wave resonance device 41 of described first multimode resonator 4 and the second quarter-wave resonance device 42 are interconnected by vertical line near one end of first input end mouth 50 ohm microstrip conduction band 11, first plane of symmetry minor matters loading unit 43, second plane of symmetry minor matters loading unit 44, 3rd plane of symmetry minor matters loading unit 45 and the first quarter-wave resonance device 41, second quarter-wave resonance device 42 is parallel to each other distribution, first plane of symmetry minor matters loading unit 43 is identical with the 3rd plane of symmetry minor matters loading unit 45 physical dimension and be symmetrically distributed in the second plane of symmetry minor matters loading unit 44 both sides, 3rd quarter-wave resonance device 51 of the second multimode resonator 5 and the 4th quarter-wave resonance device 52 are interconnected by vertical line near one end of the second input port 50 ohm microstrip conduction band 14, 4th plane of symmetry minor matters loading unit 53, 5th plane of symmetry minor matters loading unit 54, hexasymmetric faces minor matters loading unit 55 and the 3rd quarter-wave resonance device 51, 4th quarter-wave resonance device 52 is parallel to each other distribution, 4th plane of symmetry minor matters loading unit 53 is identical with hexasymmetric faces minor matters loading unit 55 physical dimension and be symmetrically distributed in the 5th plane of symmetry minor matters loading unit 54 both sides.
The present invention is based on the broadband high selectivity balancing band bandpass filter of multimode resonator, wherein the first quarter-wave resonance device 41 of the first multimode resonator 4 and the second multimode resonator 5, second quarter-wave resonance device 42, 3rd quarter-wave resonance device 51, the length of the 4th quarter-wave resonance device 52 and width determine the centre frequency position of difference mode signal, regulate the first plane of symmetry minor matters loading unit 43, second plane of symmetry minor matters loading unit 44, 3rd plane of symmetry minor matters loading unit 45, 4th plane of symmetry minor matters loading unit 53, 5th plane of symmetry minor matters loading unit 54 and hexasymmetric faces minor matters loading unit 55 can change the pass band width of difference mode signal, first input end mouth quarter-wave main transmission line 12, first quarter-wave resonance device 41 of the second input port quarter-wave main transmission line l3 and coupling in parallel, the intensity effect of spacing to coupling of the 3rd quarter-wave resonance device 51 is larger, the less stiffness of coupling of spacing is larger, amplitude and the phase place goodness of fit of two output ports are higher.
The present invention is based on the broadband high selectivity balancing band bandpass filter of multimode resonator, undertaken processing corrosion by the metal covering of printed-circuit board manufacturing technology to circuit substrate front and the back side thus metal pattern needed for being formed on manufacturing.
Below in conjunction with specific embodiment, the present invention is described in further detail.
Embodiment 1
Based on the broadband high selectivity balancing band bandpass filter of multimode resonator structure as shown in Figure 1, as shown in Figure 2, regarding sizes specification is as shown in Figure 3 for vertical view.Medium substrate 6 relative dielectric constant adopted is 3.55, and thickness is 0.508mm, and loss angle tangent is 0.0035.Composition graphs 3, each dimensional parameters of balance filter is as follows: W
1=1.2mm, W
2=0.4mm, W
3=0.4mm, W
4=1.2mm, W
5=0.8mm, W
6=1.13mm, W
7=4mm, L
1=8mm, L
2=4.4mm, L
3=25.4mm, L
4=33.8mm, L
5=22.2mm, L
6=10.8mm, L
7=6mm, g
1=0.15mmg
2=0.1mm.The gross area that balance filter does not comprise 50 ohm microstrip conduction bands is 34.9 × 50.8mm
2, corresponding guide wavelength is of a size of 0.36 λ
g× 0.53 λ
g, wherein λ
gfor the guide wavelength that passband central frequency is corresponding.
This example balance filter is modeling and simulating in electromagnetic simulation software HFSS.13.Fig. 4 is the S parameter analogous diagram of balance filter in this example, the insertion loss S namely under difference mode signal input condition
dd21 and return loss S
dd11, the insertion loss S under common-mode signal input condition
cc21, as can be seen from Figure 4, this balance filter passband central frequency under difference mode signal is 1.65GHz, 3dB relative bandwidth is 33.9%, maximum Insertion Loss 0.5dB in passband, return loss is lower than 10dB, and common mode inhibition is higher than 15dB, and the both sides of passband respectively have a transmission zero to make this example balance filter have good selectivity.
In sum, the present invention is based on the broadband high selectivity balancing band bandpass filter of multimode resonator, Field distribution characteristic in conjunction with multimode resonator and main transmission line achieves one and has the characteristics such as Wide stop bands, miniaturization, high common mode inhibition, high selectivity, low-loss, and this balance filter is highly suitable for modern wireless communication systems.
Claims (4)
1. the broadband high selectivity balancing band bandpass filter based on multimode resonator, it is characterized in that: comprise the input port feeder line (1), the first output port feeder line (2), the second output port feeder line (3), the first multimode resonator (4), the second multimode resonator (5) that are positioned at medium substrate (6) upper surface and be positioned at the metal ground plate (7) of medium substrate (6) lower surface, wherein the first multimode resonator (4) and the second multimode resonator (5) are plane of symmetry minor matters loaded type multimode resonator; Input port feeder line (1) comprises first input end mouth 50 ohm microstrip conduction band (11), first input end mouth quarter-wave main transmission line (12), the second input port quarter-wave main transmission line (13), the second input port 50 ohm microstrip conduction band (14); First output port feeder line (2) comprises the first output port 50 ohm microstrip conduction band (21) and the first output port quarter-wave coupling line (22); Second output port feeder line (3) comprises the second output port 50 ohm microstrip conduction band (31) and the second output port quarter-wave coupling line (32); First multimode resonator (4) comprises the first quarter-wave resonance device (41), the second quarter-wave resonance device (42), the first plane of symmetry minor matters loading unit (43), the second plane of symmetry minor matters loading unit (44) and the 3rd plane of symmetry minor matters loading unit (45); Second multimode resonator (5) comprises the 3rd quarter-wave resonance device (51), the 4th quarter-wave resonance device (52), the 4th plane of symmetry minor matters loading unit (53), the 5th plane of symmetry minor matters loading unit (54) and hexasymmetric faces minor matters loading unit (55).
2. the broadband high selectivity balancing band bandpass filter based on multimode resonator according to claim 1, is characterized in that: first input end mouth quarter-wave main transmission line (12) of described input port feeder line (1) and the first quarter-wave resonance device (41) parallel coupling of the first multimode resonator (4); 3rd quarter-wave resonance device (51) parallel coupling of the second input port quarter-wave main transmission line (13) and the second multimode resonator (5); Second quarter-wave resonance device (42) parallel coupling of the first output port quarter-wave coupling line (22) and the first multimode resonator (4); 4th quarter-wave resonance device (52) parallel coupling of the second output port quarter-wave coupling line (32) and the second multimode resonator (5).
3. the broadband high selectivity balancing band bandpass filter based on multimode resonator according to claim 1, is characterized in that: first input end mouth 50 ohm microstrip conduction band (11) and second input port 50 ohm microstrip conduction band (14) of described input port feeder line (1) are measure-alike; First input end mouth quarter-wave main transmission line (12) and the second input port quarter-wave main transmission line (13) measure-alike; First output port feeder line (2) is identical with the physical dimension of the second output port feeder line (3), and the first multimode resonator (4) and the second multimode resonator (5) are the identical plane of symmetry minor matters of physical dimension and load multimode resonator.
4. the broadband high selectivity balancing band bandpass filter based on multimode resonator according to claim 2, it is characterized in that: the first quarter-wave resonance device (41) of described first multimode resonator (4) and the second quarter-wave resonance device (42) are interconnected by vertical line near one end of first input end mouth 50 ohm microstrip conduction band (11), first plane of symmetry minor matters loading unit (43), second plane of symmetry minor matters loading unit (44), 3rd plane of symmetry minor matters loading unit (45) and the first quarter-wave resonance device (41), second quarter-wave resonance device (42) is parallel to each other distribution, first plane of symmetry minor matters loading unit (43) is identical with the 3rd plane of symmetry minor matters loading unit (45) physical dimension and be symmetrically distributed in the second plane of symmetry minor matters loading unit (44) both sides, 3rd quarter-wave resonance device (51) of the second multimode resonator (5) and the 4th quarter-wave resonance device (52) are interconnected by vertical line near one end of the second input port 50 ohm microstrip conduction band (14), 4th plane of symmetry minor matters loading unit (53), 5th plane of symmetry minor matters loading unit (54), hexasymmetric faces minor matters loading unit (55) and the 3rd quarter-wave resonance device (51), 4th quarter-wave resonance device (52) is parallel to each other distribution, 4th plane of symmetry minor matters loading unit (53) is identical with hexasymmetric faces minor matters loading unit (55) physical dimension and be symmetrically distributed in the 5th plane of symmetry minor matters loading unit (54) both sides.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244573A (en) * | 2015-10-30 | 2016-01-13 | 南京理工大学 | Dual-mode high-performance balance band-pass filter based on E-shaped resonators |
| CN105304984A (en) * | 2015-11-24 | 2016-02-03 | 南京理工大学 | Balance band-pass filter based on interdigital multimode resonators |
| CN106099268A (en) * | 2016-07-28 | 2016-11-09 | 南京理工大学 | A kind of broadband merit filter-divider |
| CN106972228A (en) * | 2017-03-30 | 2017-07-21 | 深圳市深大唯同科技有限公司 | A kind of high selectivity balun wave filter based on line of rabbet joint form |
| CN107204502A (en) * | 2017-06-23 | 2017-09-26 | 南京理工大学 | The three mould balun bandpass filters based on asymmetric coupling line |
| CN108879043A (en) * | 2018-06-26 | 2018-11-23 | 井冈山大学 | A kind of three modal balancing filters using coupling minor matters load line of rabbet joint resonance structure |
| CN109066039A (en) * | 2018-06-25 | 2018-12-21 | 南京师范大学 | A kind of novel micro-strip function divides duplexer |
| CN113381144A (en) * | 2021-06-07 | 2021-09-10 | 南京智能高端装备产业研究院有限公司 | High-performance balanced band-pass filter based on equilateral triangle patch |
| CN113964467A (en) * | 2021-10-25 | 2022-01-21 | 金陵科技学院 | Balance-unbalanced type in-phase filtering power divider based on three-wire coupling |
| CN114284677A (en) * | 2021-12-28 | 2022-04-05 | 金陵科技学院 | High-selectivity broadband inverse filtering power divider based on three-wire coupling |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244573A (en) * | 2015-10-30 | 2016-01-13 | 南京理工大学 | Dual-mode high-performance balance band-pass filter based on E-shaped resonators |
| CN105304984A (en) * | 2015-11-24 | 2016-02-03 | 南京理工大学 | Balance band-pass filter based on interdigital multimode resonators |
| CN106099268A (en) * | 2016-07-28 | 2016-11-09 | 南京理工大学 | A kind of broadband merit filter-divider |
| CN106972228A (en) * | 2017-03-30 | 2017-07-21 | 深圳市深大唯同科技有限公司 | A kind of high selectivity balun wave filter based on line of rabbet joint form |
| CN107204502A (en) * | 2017-06-23 | 2017-09-26 | 南京理工大学 | The three mould balun bandpass filters based on asymmetric coupling line |
| CN107204502B (en) * | 2017-06-23 | 2019-05-07 | 南京理工大学 | The three mould balun bandpass filters based on asymmetric coupling line |
| CN109066039A (en) * | 2018-06-25 | 2018-12-21 | 南京师范大学 | A kind of novel micro-strip function divides duplexer |
| CN108879043A (en) * | 2018-06-26 | 2018-11-23 | 井冈山大学 | A kind of three modal balancing filters using coupling minor matters load line of rabbet joint resonance structure |
| CN108879043B (en) * | 2018-06-26 | 2024-04-12 | 井冈山大学 | Three-mode balance filter adopting coupling branch loading slot line resonance structure |
| CN113381144A (en) * | 2021-06-07 | 2021-09-10 | 南京智能高端装备产业研究院有限公司 | High-performance balanced band-pass filter based on equilateral triangle patch |
| CN113964467A (en) * | 2021-10-25 | 2022-01-21 | 金陵科技学院 | Balance-unbalanced type in-phase filtering power divider based on three-wire coupling |
| CN114284677A (en) * | 2021-12-28 | 2022-04-05 | 金陵科技学院 | High-selectivity broadband inverse filtering power divider based on three-wire coupling |
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Application publication date: 20150923 |