CN106099298A - Ultra broadband filter response power divider - Google Patents
Ultra broadband filter response power divider Download PDFInfo
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- CN106099298A CN106099298A CN201610472931.0A CN201610472931A CN106099298A CN 106099298 A CN106099298 A CN 106099298A CN 201610472931 A CN201610472931 A CN 201610472931A CN 106099298 A CN106099298 A CN 106099298A
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- pass filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
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Abstract
The invention discloses a kind of ultra broadband filter response power divider, mainly solve the narrow problem of power divider bandwidth of prior art.It includes micro-strip medium substrate (1), input port (2), two output ports (7,8), upper and lower two broadband filters (3,4), upper broadband filter (3) is cascaded by high pass filter unit (31), stepped impedance transmission line (32) and low-pass filter unit (33) and forms.High pass filter unit is made up of main transmission line and a pair short circuit minor matters, and low-pass filter unit is formed by three sections of low impedance transmission line and four pairs of high impedance minor matters alternately cascades, is connected by stepped impedance transmission line coupling between high and low pass filtering unit；Lower broadband filter (4) is identical with upper broadband filter (3) structure, is symmetrical arranged, and is provided with isolation resistance (6) between the two.The present invention can realize the bandpass filtering response of 3GHz to 16GHz, can be used for wireless communication system radio-frequency front-end.
Description
Technical field
The invention belongs to microwave device technology field, particularly to ultra broadband filter response power divider, can be used for nothing
Line communication system radio-frequency front-end.
Background technology
Along with developing rapidly of communication technology, people are more and more higher to the requirement of information transmission system, it is desirable to obtain more
Frequency spectrum resource, the transfer rate improving data, the safety improving system and reduce production cost etc..This background it
Under, ultra broadband UWB technology is simple with its system structure, low cost, power consumption are little, safety is high, be not likely to produce interference, data are transmitted
Speed high becomes a study hotspot of current wireless communication field.In a wireless communication system, power splitter and filtering
Device is two important microwave device, in the circuit of the radio-frequency front-end being applied to communication system the most together, due to this two
Passive device occupies bigger space at radio-frequency front-end, and the miniaturization that greatly limit wireless communication system sets
Meter.Traditional method is that power splitter and wave filter are carried out single Miniaturization Design, and whole system so can be made in certain journey
Reduced on degree, but the space ratio that entirety reduces is relatively limited, additionally, at the Miniaturization Design to power splitter and wave filter
In, some is to sacrifice insertion loss as cost.In recent years, gradually some research worker proposes a kind of general
Wave filter and the scheme of power splitter Integration Design, in a circuit structure, realize the function of power splitter and wave filter simultaneously,
So can not only reduce the volume of circuit, moreover it is possible to make the loss of system be improved.
Ultra broadband UWB technology the earliest with military radar as main uses, after lift a ban on February 14th, 2002, the United States Federal
Federal Communications Commission FCC specifies: " in transmit power less than the U.S. radiation noise specifications value-41.3dBm/MHz, i.e. power be then
Under conditions of 1mW/MHz, the frequency band of 3.1G～10.6GHz can be used for the imaging system being scanned the thing of underground and partition wall
System, automobile collision avoidance radar and carry out finding range and RFDC between household electrical appliance terminal and portable terminal ".
In March, 2008, Zhewang Ma and Wenqing He et al. was in IEEE MTT-S International meeting
" A Novel Compact Ultra-Wideband Bandpass has been delivered on (June.15-20, pp.435-438,2008)
Filter Using Microstrip Stub-Loaded Dual-Mode Resonator Doublets ", it is proposed that a kind of
Ultra-wide band filter, this wave filter can realize the ultra broadband of 3.3-10.4GHz, and ultra broadband bandwidth of operation only covers 3.3-
10.4GHz, and merit can not be carried out divide.
In January, 2010 Kaijun Song, et al. at IEEE MICROWAVE AND WIRELESS COMPONENTS
" Novel Ultra-Wideband (UWB) has been delivered on LETTERS periodical (vol.20, no.1, pp.28-30,2011)
Multilayer Slotline Power Divider With Bandpass Response ", propose a kind of ultra broadband and have
The power splitter of filtering characteristic, though the method can carry out merit and divide, but frequency range covers and can only achieve 3.1GHz to 11.5GHz, this
It is just the defined band limits of covering ultra wideband, it is impossible to extend further, to reach broader frequency band range, to such an extent as to cannot
Using the Ku wave band in satellite communication, this filter response passband edge fall off rate is relatively slow simultaneously, and shirt rim steep is relatively low.
Summary of the invention
Present invention aim at the deficiency for above-mentioned prior art, propose a kind of ultra broadband that can extend bandwidth further
Filter response power divider, to extend to pass band width to cover five octaves, i.e. realizes the frequency of 3GHz to 16GHz
Section, meets the band requirement of 14/12GHz satellite communications services.
For achieving the above object, the ultra broadband filter response power divider of the present invention, including micro-strip medium substrate, input
Port, two output ports, laterally zygomorphic two broadband filters；These two broadband filters and input/output port etching
On medium substrate, for metal ground plate below medium substrate；The two ends of upper broadband filter respectively with input port
Connecting with the first output port, the two ends of lower broadband filter are connected with input port and the second output port respectively, its feature
Being, each broadband filter, by high pass filter unit, stepped impedance transmission line, low-pass filter unit cascade forms；
Described high pass filter unit, is made up of main transmission line and a pair short circuit minor matters, is used for realizing 3GHz high-pass filtering and rings
Should；
Described low-pass filter unit, selects string calabash shape height electric impedance resonator structure, by three sections of low impedance transmission line and
Four pairs of high impedance minor matters alternately cascades form, and are used for realizing 16GHz low-pass filter response；
High pass filter unit and low-pass filter unit are connected by stepped impedance transmission line coupling, i.e. main transmission line and four right
High impedance minor matters are connected respectively to the two ends of stepped impedance transmission line, it is achieved ultra broadband filter function.
The invention have the advantages that
1. due to the fact that two branch roads at power divider have employed the structure of multistage transmission line cascade, it is achieved merit is divided
The ultra broadband characteristic of device；
2. the present invention constitutes high-pass filtering list by loading a pair short circuit minor matters on the main transmission line of power divider
Unit, it is achieved the filtering characteristic of power splitter frequency low side, is reduced to 3GHz by passband low-end cut-off frequency；
3. the present invention is by having cascaded string calabash shape height electric impedance resonator structure before the output port of power divider
Low-pass filter unit, it is achieved that the filtering characteristic that power splitter frequency is high-end, passband high end cut-off frequencies is risen to 16GHz.
Accompanying drawing explanation
Fig. 1 is the tomograph of the present invention；
Fig. 2 is two broadband filter structure charts of upper and lower symmetry in the present invention；
Fig. 3 is low-pass filter unit amplification assumption diagram in the present invention；
Fig. 4 is that the input port of the embodiment of the present invention is to output port transmission coefficient curve chart；
Fig. 5 is return loss and the output port isolation curve chart of the input port of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the invention are elaborated:
With reference to Fig. 1, Fig. 2 and Fig. 3, the present invention mainly by micro-strip medium substrate 1, input port 2, two output ports 7,8,
Upper and lower two broadband filters 3,4, upper and lower two high pass filter unit 31,41, upper and lower two stepped impedance transmission lines 32,42,
Upper and lower two low-pass filter units 33,43, metal ground plate 5, isolation resistance 6 forms, wherein:
Described micro-strip medium substrate 1, using dielectric constant is 2.45, and thickness of slab is the double-sided copper-clad medium substrate of 1mm, two-sided
It it is metal ground plate 5 below copper-clad plate；
Described upper and lower two high pass filter unit 31,41 structure is identical and symmetrically placed, i.e. go up high pass filter unit 31 by
A length of L1, a width of w1Transmission line 311 and a length of L4, a width of w4Two parallel connection short circuit minor matters 312 form, same, lower height
Pass filtering unit 41 is by a length of L1', a width of w1' transmission line 411 and a length of L4', a width of w4' two parallel connection short circuit minor matters 412
Composition, wherein L1=L1'=18mm, w1=w1'=4mm, L4=L4'=3.2mm, w4=w4'=0.5mm, by the two high pass
Filter unit 31,41 realizes the high pass response of 3GHz；
Described upper and lower two low-pass filter units 33,43 all select string calabash shape height electric impedance resonator structure to realize, and
Symmetrically placed, i.e. go up low-pass filter unit 33 and be made up of low-impedance line 331 and high impedance line 332 respectively, wherein, low-impedance line divides
Being three sections, left side segment is w with the length of the right section9=2*L6+w7, wide it is L7, a length of w of interlude6, a width of L7；High impedance
Line is divided into four sections, and every segment length is L5, wide it is w5.Same, lower low-pass filter unit 43 respectively by low-impedance line 431 with
High impedance line 432 forms, and wherein, low-impedance line is divided into three sections, and left side segment and the right segment length are w9'=2*L6'+w7', wide all
For L7', a length of w of interlude6', a width of L7'；High impedance line is divided into four sections, and length is L5', wide it is w5', as shown in Figure 3.Wherein
w9=w9'=12.4mm, L7=L7'=0.4mm, w6=w6'=4mm；L5=L5'=0.4mm, w5=w5'=0.8mm, by this
Plant string calabash shape height electric impedance resonator structure and can realize the lowpass response of 16GHz.
Upper high pass filter unit 31 is connected, jointly by 50 ohm of cascade transmission line 32 couplings with upper low-pass filter unit 33
Broadband filter 3 on composition, same, lower broadband filter 4 is also made up of this three part, i.e. descend high pass filter unit 41 with
Lower low-pass filter unit 43 is connected by 50 ohm of cascade transmission lines 42 couplings, they collectively constituted laterally zygomorphic two wide
Band filter 3 and 4.Wherein, a length of L of transmission line 323=8mm, a width of w3=2.73mm.
Described isolation resistance 6 is arranged between these laterally zygomorphic two broadband filters 3 and 4, the size of isolation resistance 6
Determining the isolation characteristic of power splitter, this example is provided with seven resistance same resistance altogether, it may be assumed that
R1=R2=R3=R4=R5=R6=R7=200 Ω.
The effect of the present invention can be further illustrated by following emulation:
Emulation 1, emulates the transmission characteristic of ultra broadband filter response power splitter of the present invention, and result is by Fig. 4, wherein,
S21(dB) curve represents the transmission characteristic between input port the 2 to the first output port 7；S31(dB) curve represents input
Transmission characteristic between mouth the 2 to the second output port 8.
As shown in Figure 4, the filtering merit that this ultra broadband filter response power splitter achieves in 3-16GHz frequency range divides response, point
Join with insertion loss less than 4.5dB.
Emulation 2, emulates with isolation characteristic the reflection characteristic of ultra broadband filter response power splitter of the present invention, result
By Fig. 5, wherein S11(dB) curve represents the reflection characteristic of input port 2, S23(dB) represent output port 7 and output port 8 it
Between isolation characteristic curve.
As shown in Figure 5, the coverage diagram S of ultra-wide band filter of the present invention11Middle maximum is less than-8dB, output port
Between isolation S23More than 10dB.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by above-described embodiment
Limit, the change made under other any spirit without departing from the present invention and principle, modify, substitute, combine, simplify,
All should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (7)
1. a ultra broadband filter response power divider, including micro-strip medium substrate (1), input port (2), two outfans
Mouth (7,8), upper and lower two broadband filters (3,4)；These two broadband filters and input/output port are etched in medium substrate
(1) above, for metal ground plate (5) below medium substrate (1)；The two ends of upper broadband filter (3) respectively with input
The connection of mouthful (2) and the first output port (7), the two ends of lower broadband filter (4) respectively with input port (2) and the second outfan
Mouth (8) connects, it is characterised in that
Described upper broadband filter (3), by high pass filter unit (31), stepped impedance transmission line (32), low-pass filter unit
(33) cascade forms；
This high pass filter unit (31), is made up of main transmission line (311) and a pair short circuit minor matters (312), is used for realizing 3GHz high
Pass filter responds；
This low-pass filter unit (33), selects string calabash shape height electric impedance resonator structure, by three sections of low impedance transmission line (331)
Replace cascade with four pairs of high impedance minor matters (332) to form, be used for realizing 16GHz low-pass filter response；
High pass filter unit (33) is connected by stepped impedance transmission line (32) coupling with low-pass filter unit (31), the most main transmission
Line (311) is connected respectively to the two ends of stepped impedance transmission line (32) with four pairs of high impedance minor matters (332), it is achieved ultra broadband filters
Function；
Described lower broadband filter (4), identical and symmetrically placed with upper broadband filter (3) structure.
Ultra broadband filter response power divider the most according to claim 1, it is characterised in that upper broadband filter (3)
The first output port (7) and the second output port (8) is laid respectively at, in upper broadband filter (3) with lower broadband filter (4)
Seven identical isolation resistances (6) it are loaded with for right in the middle of the main transmission line that main transmission line is symmetrical with lower broadband filter (4)
First output port (7) is isolated with the second output port (8), it is achieved ultra broadband power distributes.
Ultra broadband filter response power divider the most according to claim 1, it is characterised in that main in high pass filter unit
The characteristic impedance of transmission line (311) is less than 50 ohm, length L1Meet λgL/ 4 ＜ L1＜ λgL, wherein, λgLRepresent intermediate variable,fcLFor the cut-off frequency of high pass filter, c is the light velocity in vacuum, εeEffective Jie for micro-strip plate
Electric constant.
Ultra broadband filter response power divider the most according to claim 1, it is characterised in that a pair short circuit minor matters (312)
Length L4=λgL/4 forms, and the spacing between two minor matters meets L8=λgL/ 2, wherein, λgL represents intermediate variable,fcLFor the cut-off frequency of high pass filter, c is the light velocity in vacuum, εeEffective Jie for micro-strip plate
Electric constant.
Ultra broadband filter response power divider the most according to claim 1, it is characterised in that low-impedance line (331) is special
Property impedance less than 50 ohm, length L7＜ λgH/ 4, wherein λgH represents intermediate variable,fcHFor low pass filtered
The cut-off frequency of ripple device, c is the light velocity in vacuum, εeEffective dielectric constant for micro-strip plate.
Ultra broadband filter response power divider the most according to claim 1, it is characterised in that high impedance line (332) is special
Property impedance more than 50 ohm, length L5＜ λgH/ 4, wherein λgH represents intermediate variable,fcHFor low pass
The cut-off frequency of wave filter, c is the light velocity in vacuum, εeEffective dielectric constant for micro-strip plate.
Ultra broadband filter response power divider the most according to claim 1, it is characterised in that micro-strip medium substrate (1) is adopted
Being 2.45 with dielectric constant, thickness of slab is the double face copper of 1mm, above it be metal etch face as microstrip line face, below
Metal covering is as earth plate (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610472931.0A CN106099298B (en) | 2016-06-24 | 2016-06-24 | Ultra wide band filter response power divider |
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| CN201610472931.0A CN106099298B (en) | 2016-06-24 | 2016-06-24 | Ultra wide band filter response power divider |
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| CN106099298B CN106099298B (en) | 2019-03-26 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107086345A (en) * | 2017-04-07 | 2017-08-22 | 深圳市华讯方舟微电子科技有限公司 | Ultra wide band wilkinson power divider |
| CN109728393A (en) * | 2018-08-07 | 2019-05-07 | 中国航空工业集团公司雷华电子技术研究所 | A kind of racemosus section power splitter |
| CN111834726A (en) * | 2020-07-28 | 2020-10-27 | 南京理工大学 | Broadband filtering power divider capable of realizing high power division ratio |
| CN115483520A (en) * | 2022-10-17 | 2022-12-16 | 苏州灿勤通讯技术有限公司 | High-power low-intermodulation power divider |
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| CN104078736A (en) * | 2013-03-26 | 2014-10-01 | 中国科学院微电子研究所 | Miniaturized broadband power divider circuit |
| CN203554395U (en) * | 2013-10-08 | 2014-04-16 | 桂林市思奇通信设备有限公司 | Combiner simultaneously having demultiplexer function |
| CN105259563A (en) * | 2014-12-26 | 2016-01-20 | 上海华测导航技术股份有限公司 | Circuit structure converting GPS satellite signal into baseband signal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086345A (en) * | 2017-04-07 | 2017-08-22 | 深圳市华讯方舟微电子科技有限公司 | Ultra wide band wilkinson power divider |
| CN109728393A (en) * | 2018-08-07 | 2019-05-07 | 中国航空工业集团公司雷华电子技术研究所 | A kind of racemosus section power splitter |
| CN111834726A (en) * | 2020-07-28 | 2020-10-27 | 南京理工大学 | Broadband filtering power divider capable of realizing high power division ratio |
| CN111834726B (en) * | 2020-07-28 | 2022-04-19 | 南京理工大学 | Broadband filtering power divider capable of realizing high power division ratio |
| CN115483520A (en) * | 2022-10-17 | 2022-12-16 | 苏州灿勤通讯技术有限公司 | High-power low-intermodulation power divider |
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