CN107204502B - Three-mode Balun Bandpass Filter Based on Asymmetric Coupled Lines - Google Patents
Three-mode Balun Bandpass Filter Based on Asymmetric Coupled Lines Download PDFInfo
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- CN107204502B CN107204502B CN201710484744.9A CN201710484744A CN107204502B CN 107204502 B CN107204502 B CN 107204502B CN 201710484744 A CN201710484744 A CN 201710484744A CN 107204502 B CN107204502 B CN 107204502B
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- 239000000758 substrate Substances 0.000 claims abstract description 44
- 230000008878 coupling Effects 0.000 claims abstract description 29
- 238000010168 coupling process Methods 0.000 claims abstract description 29
- 238000005859 coupling reaction Methods 0.000 claims abstract description 29
- 239000002184 metal Substances 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 22
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 abstract 1
- 238000013461 design Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 7 one broadsides Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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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
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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
- H01P7/10—Dielectric resonators
- H01P7/105—Multimode resonators
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Abstract
本发明公开一种基于非对称耦合线的三模巴伦带通滤波器，包括矩形介质基板(7)，其下表面满贴金属接地板(6)，其上表面设有输入端口馈线(1)、第一、二输出端口馈线(2、3)，输入端口馈线(1)与介质基板(7)宽边平行，其输入端位于介质基板(7)的一个窄边中点，第一、二输出端口馈线(2、3)的输出端分别位于矩形介质基板(7)的两个宽边的中点，在第一输出端口馈线(2)与输入端口馈线(1)之间设有第一多模谐振器(4)，在第二输出端口馈线(3)与输入端口馈线(1)之间设有第二多模谐振器(5)。本发明的巴伦带通滤波器，结构简单、损耗低、选择性和端口匹配特性好。
The invention discloses a three-mode balun bandpass filter based on an asymmetric coupling line, comprising a rectangular dielectric substrate (7), the lower surface of which is fully covered with a metal ground plate (6), and the upper surface of which is provided with an input port feeder (1). ), the first and second output port feeders (2, 3), the input port feeder (1) is parallel to the broad side of the dielectric substrate (7), and its input end is located at the midpoint of a narrow side of the dielectric substrate (7). The output ends of the two output port feeders (2, 3) are respectively located at the midpoints of the two broad sides of the rectangular dielectric substrate (7). A multimode resonator (4), a second multimode resonator (5) is arranged between the second output port feeder (3) and the input port feeder (1). The balun bandpass filter of the invention has the advantages of simple structure, low loss, good selectivity and port matching characteristics.
Description
Technical field
The present invention relates to microwave passive component technical field, especially a kind of three mould balun bands based on asymmetric coupling line
Bandpass filter.
Background technique
In recent years, with modular structural units (Modular Building Block, MBB) and monolithic integrated microwave circuit
The development of (Monolithic MicrowaveIntegrated Circuit, MMIC), inexpensive, highly integrated, miniaturization are
Have become very important Consideration in modern wireless communication systems Integrated design.
Balun filter is an independent microwave passive component, it functionally realize in radio circuit filter and
Effective combination of balun, that is to say, that the function that balun filter has had both the filtering of signal and the constant amplitude of power is reversely distributed
Energy.Therefore, high performance balun filter can not only effectively reduce the size of system, and can simplify answering for system design
Miscellaneous degree, to further realize the low cost of wireless communication system, high-performance, Miniaturization Design.
(Lap Kun Yeung and Ke-Li Wu, the A Dual-Band Coupled-Line Balun of document 1
Filter, IEEE Transaction on Microwave Theory Technique, 2007,55, (11): 2406-2411)
Middle proposition realizes balun filter in conjunction with the resonance characteristic of step electric impedance resonator in the theoretical basis of Marchand balun
Design method.Although this design method design theory is relatively simple, since the structure introduces stepped impedance resonance
Device, so that the narrower bandwidth of designed balun filter.Further, since the circuit is related to the coupling of three lines, so that must adopt
Enhance the stiffness of coupling between step electric impedance resonator and main transmission line, therefore the balun filter with zigzag coupled mode
Structure it is more complex, circuit size is also larger.
(Wenjie Feng and Wenquan Che, the Novel wideband differential of document 2
bandpass filters based on T-sharped structure,IEEE Transaction on Microwave
Theory Technique, 2012,60, the T-type based on load open circuit minor matters and short-circuit minor matters (6): is proposed in 1560-1568)
The resonator of structure realizes the Differential Output of signal and the bandpass characteristics of bimodulus, although this design method structure is more simple
It is single, but common mode inhibition effect is only 14.5dB, and its differential mode Out-of-band rejection is poor.
(Vicente Gonz á lez-Posadas, Carlos Mart í n-Pascual, the Jos é Luis Jim é of document 3
nez-Martín,and Daniel Segovia-Vargas,Lumped-Element Balun for UHF UWB Printed
Balanced Antennas, IEEE Transactions on Antennas and Propagation, 2008,1, (56):
2101-2107) it proposes to pass through the method being collocated with each other to design balun filter between low pass and high-pass filter.Although this
The balun of kind of design method design have the advantages that in low-frequency range it is small in size, but due to the correlation properties of lamped element, it
Lossy big, narrower bandwidth and amplitude and the not high disadvantage of the phase goodness of fit.
In short, problem of the existing technology is: balun filter construction is complicated, height, poor selectivity, port match is lost
Characteristic is bad.
Summary of the invention
The purpose of the present invention is to provide a kind of three mould balun bandpass filters based on asymmetric coupling line, structure letter
List, loss is low, selectivity is good, has preferable port match performance.
The technical solution for realizing the aim of the invention is as follows:
A kind of three mould balun bandpass filters based on asymmetric coupling line, the square of metal earth plate is expired including lower surface
Shape medium substrate is equipped with input port feeder line, the first output port feeder line and second in the upper surface of the Rectangular Enclosure with Participating Media substrate
Output port feeder line；The input port feeder line is parallel with medium substrate broadside, and it is one narrow to be located at medium substrate for input terminal
Side midpoint, the output end of the first output port feeder line are located at the midpoint of a broadside of Rectangular Enclosure with Participating Media substrate, and described second
The output end of output port feeder line is located at the midpoint of another broadside of Rectangular Enclosure with Participating Media substrate；In the first output port feeder line
The first multimode resonator is equipped between input port feeder line, between the second output terminal mouth feeder line and input port feeder line
Equipped with the second multimode resonator.
Compared with prior art, the present invention its remarkable advantage are as follows:
1, structure is simple: the present invention is made of two multimode resonators and three input and output feeder lines, and structure is simple；
2, be lost low: insertion loss of the invention is less than 0.6dB；
3, selectivity is good: for the present invention in passband two sides there are two transmission zero, selectivity is good；
4, port match characteristic is good: return loss is less than 15dB in band of the present invention, and port match characteristic is good.
Present invention is further described in detail in the following with reference to the drawings and specific embodiments.
Detailed description of the invention
Fig. 1 is the schematic perspective view of the three mould balun bandpass filters the present invention is based on asymmetric coupling line.
Fig. 2 is the top view of Fig. 1.
Fig. 3 is the structure size schematic diagram of embodiment 1.
Fig. 4 is the S parameter analogous diagram of embodiment 1.
Fig. 5 is the two output port amplitude differences and phase difference figure of balun filter in example 1.
Specific embodiment
In conjunction with Fig. 1,2, the present invention is based on three mould balun bandpass filters of asymmetric coupling line, including lower surface completely to gild
It is defeated to be equipped with input port feeder line 1, first in the upper surface of the Rectangular Enclosure with Participating Media substrate 7 for the Rectangular Enclosure with Participating Media substrate 7 for belonging to earth plate 6
Exit port feeder line 2 and second output terminal mouth feeder line 3；
The input port feeder line 1 is parallel with 7 broadside of medium substrate, and input terminal is located at a narrow side of medium substrate 7
Midpoint, the output end of the first output port feeder line 2 are located at the midpoint of a broadside of Rectangular Enclosure with Participating Media substrate 7, and described second
The output end of output port feeder line 3 is located at the midpoint of another broadside of Rectangular Enclosure with Participating Media substrate 7；
The first multimode resonator 4 is equipped between the first output port feeder line 2 and input port feeder line 1, described
The second multimode resonator 5 is equipped between second output terminal mouth feeder line 3 and input port feeder line 1.
Preferably,
The input port feeder line 1 includes 50 ohm line conduction bands 11 and half wavelength main transmission line 12,50 Europe
One end of nurse line conduction band 11 is located at a narrow side midpoint of medium substrate 7, the other end and half wavelength main transmission line 12
It is connected.
Preferably,
The first output port feeder line 2 includes the one 50 ohm microstrip conduction band 21 vertical with 7 broadside of medium substrate
The first quarter-wave coupling line 22 parallel with 7 broadside of medium substrate, the one 50 ohm microstrip conduction band 21
One end is located at the midpoint of 7 one broadsides of Rectangular Enclosure with Participating Media substrate, one end of the other end and the first quarter-wave coupling line 22
It is connected, the other end of the first quarter-wave coupling line 22 is directed toward the medium base where 1 input terminal of input port feeder line
One narrow side of plate 7.
Preferably,
The second output terminal mouth feeder line 3 includes the two 50 ohm microstrip conduction band 31 vertical with 7 broadside of medium substrate
The second quarter-wave coupling line 32 parallel with 7 broadside of medium substrate, the 2nd 50 ohm microstrip conduction band 31
One end is located at the midpoint of 7 another broadside of Rectangular Enclosure with Participating Media substrate, and the one of the other end and the second quarter-wave coupling line 32
End is connected, and the other end of the second quarter-wave coupling line 32 is directed toward and medium where 1 input terminal of input port feeder line
The opposite another narrow side of 7 narrow side of substrate.
Preferably,
First multimode resonator 4 is identical as 5 shape of the second multimode resonator, about 7 upper surface geometry of medium substrate
The opening of center arrangement in a center of symmetry, the first multimode resonator 4 and the second multimode resonator 5 is towards table on medium substrate 7
The long side middle line in face.
First multimode resonator 4, the second multimode resonator 5 are the multimode resonance of embedded circular symmetric face minor matters load
Device.
Preferably,
First multimode resonator 4 is symmetrical including the first short-circuit column 41, the first half wave resonator 42, first
Face minor matters loading unit 43, first annular loading unit 44, it is humorous that the described first short-circuit column 41 loads on the first half wavelength
The center of vibration device 42, the first half wave resonator 42 are bent at c-type right angle, opening direction and half wavelength
Main transmission line 12 is parallel, and first plane of symmetry minor matters loading unit 43 loads in the first half wave resonator 42
The heart, and it is parallel with half wavelength main transmission line 12, and the first annular loading unit 44 is loaded with the first plane of symmetry minor matters
The central axes of unit 43 are axisymmetrically to load in the first half wave resonator 42, in first annular loading unit 44
Connect two long sides and one side far from the first short-circuit column 41 be vertical with the first plane of symmetry minor matters loading unit 43, and with first pair
Title face minor matters loading unit 43 connects far from the end face of the first half wave resonator 42.
Since the first multimode resonator 4 is identical as 5 shape of the second multimode resonator, and it is several about 7 upper surface of medium substrate
What center arrangement in a center of symmetry, therefore the second multimode mould resonator 5 includes the second short-circuit column 51, the second half wavelength
The annular loading unit 54 of resonator 52, the second plane of symmetry minor matters loading unit 53, second, the described second short-circuit column 51 load on the
The center of two half wave resonators 52, the second half wave resonator 52 are bent at c-type right angle, opening side
To parallel with half wavelength main transmission line 12, second plane of symmetry minor matters loading unit 53 loads on the second half
The center of wave resonator 52, and parallel with half wavelength main transmission line 12, the described second annular loading unit 54 is with the
The central axes of two plane of symmetry minor matters loading units 53 are axisymmetrically to load in the second half wave resonator 52, second
Two long sides and one side and the second plane of symmetry minor matters loading unit far from the second short-circuit column 51 are connected in annular loading unit 54
53 is vertical, and connects with the second plane of symmetry minor matters loading unit 53 far from the end face of the second half wave resonator 52.
Asymmetric coupling is formed between the half wavelength main transmission line 12 and the first half wave resonator 42
It closes, forms asymmetric couple between the half wavelength main transmission line 12 and the second half wave resonator 52.
In three mould balun bandpass filters in the present invention based on asymmetric coupling line, the first multimode resonator 4 and second
First half wave resonator 42 of multimode resonator 5 and the length and width of the second half wave resonator 52 are determined
Determine odd mould resonance frequency, thereby determines that centre frequency position, the first of the first multimode resonator 4 and the second multimode resonator 5
The extended distance of annular loading unit 44 and first annular loading unit 54 in 12 vertical line direction of half wavelength main transmission line
Determine the position of even mould resonance frequency, it accordingly can be with the bandwidth of operation of rough estimate filter, the main transmission of half wavelength
Coupling spacing and two between line 12 and the first half wave resonator 42 and the second half wave resonator 52
The width of/mono- wavelength main transmission line is affected to stiffness of coupling, and spacing is smaller, the narrower stiffness of coupling of width is bigger, and two
The amplitude and phase goodness of fit of output port is higher.
The present invention is based on three mould balun bandpass filters of asymmetric coupling line, are manufactured in manufacture by printed circuit board
Technique carries out processing corrosion to the metal covering in circuit substrate front and the back side, thus the metal pattern needed for being formed, structure is simple,
It can be realized on monolithic pcb board, easy to process integrated, production cost is low.Since filter of the invention is selectively good, insertion damage
Consume it is small, be suitable for modern wireless communication systems.
Present invention is further described in detail combined with specific embodiments below.
Embodiment 1
The structure of the bimodulus balun bandpass filter of tapped feed as shown in Figure 1, top view as shown in Fig. 2, related ruler
Very little specification is as shown in Figure 3.Used 7 relative dielectric constant of medium substrate is 3.55, with a thickness of 0.508mm, loss angle tangent
It is 0.0027.In conjunction with Fig. 3, each dimensional parameters of balun filter are as follows: W=1.13mm, W1=0.8mm, W2=0.4mm, W4=
0.8mm, L1=35.1mm, L2=16mm, L3=6mm, L4=4mm, L5=1.4mm, g=0.2mm.Balun filter does not include 50
The gross area of ohm microstrip conduction band is 16.4 × 35.1mm2, corresponding guide wavelength is having a size of 0.21 λg×0.45λg, wherein λg
For the corresponding guide wavelength of passband central frequency.
This example balun filter is the modeling and simulating in electromagnetic simulation software HFSS.13.0.Fig. 4 is this example mini-bus
The S parameter analogous diagram of human relations filter, it can be seen from the figure that the passband central frequency of the balun filter is 2.4GHz, relatively
Bandwidth is 19.2%, and maximum Insertion Loss 0.6dB, return loss are lower than 15dB in return loss lower passband in passband.Have three in passband
A resonance point, passband is outer, and there are three transmission zeros, so that the example balun filter has high bandwidth and well selectivity.
Fig. 5 is the two output port amplitude differences and phase difference of balun filter in this example, it can be seen from the figure that should
Two output port amplitude differences in example balun filter passband are within 0.3dB.In the example balun filter passband
Two output port phase differences are within 180 ± 5 degree.
In conclusion the present invention is based on three mould balun bandpass filters of asymmetric coupling line, in conjunction with three mould resonators and
The characteristic of asymmetric coupled structure realizes that a kind of structure is simple, loss is low, selectivity is good, has preferable port match performance
Three mould balun bandpass filters, which is highly suitable for modern wireless communication systems.
Claims (3)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710484744.9A CN107204502B (en) | 2017-06-23 | 2017-06-23 | Three-mode Balun Bandpass Filter Based on Asymmetric Coupled Lines |
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| CN201710484744.9A CN107204502B (en) | 2017-06-23 | 2017-06-23 | Three-mode Balun Bandpass Filter Based on Asymmetric Coupled Lines |
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| CN107204502A CN107204502A (en) | 2017-09-26 |
| CN107204502B true CN107204502B (en) | 2019-05-07 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193087B (en) * | 2018-09-13 | 2020-06-12 | 南京师范大学 | Novel high-performance dual-passband four-power-division filter |
| CN109273807B (en) * | 2018-09-13 | 2020-07-07 | 南京师范大学 | A Novel High Performance Broadband Quad Power Divider Filter |
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|---|---|---|---|---|
| CN104900949A (en) * | 2015-06-05 | 2015-09-09 | 南京理工大学 | Broadband three-mode balanced band-pass filter based on interdigital multi-mode resonators |
| CN104934663A (en) * | 2015-06-23 | 2015-09-23 | 南京理工大学 | Broadband high-selectivity balanced band-pass filter based on multimode resonators |
| CN105070985A (en) * | 2015-07-21 | 2015-11-18 | 天津大学 | High-dielectric-constant ceramics-based microstrip dual-bandpass filter |
| CN105990629A (en) * | 2015-01-30 | 2016-10-05 | 南京理工大学 | Broadband three-mode Balun band-pass filter based on E multi-mode resonators |
| CN106602200A (en) * | 2016-12-02 | 2017-04-26 | 南京理工大学 | Micro-strip power dividing filter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130049892A1 (en) * | 2011-08-23 | 2013-02-28 | Mesaplexx Pty Ltd | Filter |
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- 2017-06-23 CN CN201710484744.9A patent/CN107204502B/en not_active Expired - Fee Related
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| CN105990629A (en) * | 2015-01-30 | 2016-10-05 | 南京理工大学 | Broadband three-mode Balun band-pass filter based on E multi-mode resonators |
| CN104900949A (en) * | 2015-06-05 | 2015-09-09 | 南京理工大学 | Broadband three-mode balanced band-pass filter based on interdigital multi-mode resonators |
| CN104934663A (en) * | 2015-06-23 | 2015-09-23 | 南京理工大学 | Broadband high-selectivity balanced band-pass filter based on multimode resonators |
| CN105070985A (en) * | 2015-07-21 | 2015-11-18 | 天津大学 | High-dielectric-constant ceramics-based microstrip dual-bandpass filter |
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Non-Patent Citations (2)
| Title |
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| "A New Approach to Design a Microstrip Dual-Mode Balun Bandpass Filter";Feng Huang等;《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》;20160406;第252-254页 |
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