CN106099298B - Ultra wide band filter response power divider - Google Patents
Ultra wide band filter response power divider Download PDFInfo
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- CN106099298B CN106099298B CN201610472931.0A CN201610472931A CN106099298B CN 106099298 B CN106099298 B CN 106099298B CN 201610472931 A CN201610472931 A CN 201610472931A CN 106099298 B CN106099298 B CN 106099298B
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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 wide band filter response power divider, mainly solve the problems, such as that the power divider bandwidth of the prior art is narrow.It includes microstrip dielectric 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).High pass filter unit is made of main transmission line and a pair of short-circuit minor matters, and low-pass filter unit is alternately cascaded by three sections of low impedance transmission lines and four pairs of high impedance minor matters, transmits lines matching connection by stepped impedance between high and low pass filtering unit；Lower broadband filter (4) is identical as upper broadband filter (3) structure, is symmetrical arranged, and is equipped with isolation resistance (6) between the two.The present invention is able to achieve 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 fields, in particular to ultra wide band filter response power divider, can be used for nothing
Line communication system radio-frequency front-end.
Background technique
With the rapid development of communication technology, requirement of the people to the information transmission system is higher and higher, it is desirable to obtain more
Frequency spectrum resource, the transmission rates of Lai Tigao data improves the safety of system and reduces production cost etc..This background it
Under, ultra wide band UWB technology with its system structure simple, at low cost, small power consumption, it is highly-safe, be not likely to produce interference, data transmission
A research hotspot of the features such as rate is high as current wireless communication field.In a wireless communication system, power splitter and filtering
Device is two important microwave device, is often applied to together in the circuit of the radio-frequency front-end of communication system, due to this two
Passive device occupies bigger space in radio-frequency front-end, and the miniaturization for greatly limiting wireless communication system is set
Meter.Traditional method is that power splitter and filter are carried out individual Miniaturization Design, whole system can be made in certain journey in this way
It is reduced on degree, but the space integrally reduced is than relatively limited, in addition, in the Miniaturization Design to power splitter and filter
In, some is to sacrifice insertion loss as cost.In recent years, gradually some researcher proposes a kind of incite somebody to action
The scheme of filter and power splitter Integration Design in a circuit structure, while realizing the function of power splitter and filter,
The volume of circuit can not only be reduced in this way, moreover it is possible to which making the loss of system is improved.
Ultra wide band UWB technology earliest using military radar as main application, after lifted a ban on 2 14th, 2002, the United States Federal
Federal Communications Commission FCC regulation: " noise specifications value -41.3dBm/MHz is radiated lower than the U.S. sending power, i.e. power is then
Under conditions of 1mW/MHz, the imaging system that the frequency band of 3.1G~10.6GHz can be used to be scanned the object of underground and partition wall
System, automobile collision avoidance radar and progress ranging and wireless data communication 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, the filter are able to achieve the ultra wide band of 3.3-10.4GHz, and ultra wide band bandwidth of operation only covers 3.3-
10.4GHz, and not can be carried out function point.
In January, 2010 Kaijun Song, et al. in 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 ", proposes that a kind of ultra wide band has
The power splitter of filtering characteristic, though this method can be carried out function point, frequency range covering can only achieve 3.1GHz to 11.5GHz, this
It is just the defined band limits of covering ultra wideband, can not further extends, to reach broader frequency range, so that it cannot
Using the Ku wave band in satellite communication, while this filter response passband edge fall off rate is slower, and skirt steep is lower.
Summary of the invention
Present invention aims at the deficiencies for being directed to above-mentioned prior art, propose a kind of ultra wide band that can further extend bandwidth
Filter response power divider, pass band width, which is extended to, can cover five octaves, that is, realize the frequency of 3GHz to 16GHz
Section, meets the band requirement of 14/12GHz satellite communications services.
To achieve the above object, ultra wide band filter response power divider of the invention, including microstrip dielectric substrate, input
Port, two output ports, two broadband filters symmetrical above and below；Two broadband filters and input/output port etching
It is metal ground plate below the upper surface of medium substrate, medium substrate；The both ends of upper broadband filter respectively with input port
It is connected with the first output port, the both ends of lower broadband filter are connect with input port and second output terminal mouth respectively, feature
It is, each broadband filter, by high pass filter unit, stepped impedance transmission line, low-pass filter unit is cascaded；
The high pass filter unit is made of main transmission line and a pair of short-circuit minor matters, rings for realizing 3GHz high-pass filtering
It answers；
The low-pass filter unit selects string calabash shape height electric impedance resonator structure, by three sections of low impedance transmission lines and
Four pairs of high impedance minor matters alternately cascade, for realizing 16GHz low-pass filter response；
High pass filter unit and low-pass filter unit transmit lines matching by stepped impedance and connect, i.e. main transmission line and four pairs
High impedance minor matters are connected respectively to the both ends of stepped impedance transmission line, realize ultra wide band filter function.
The invention has the following advantages that
1. the present invention realizes function point since two branches in power divider use the cascade structure of multistage transmission line
The ultra wide band characteristic of device；
2. the present invention constitutes high-pass filtering list by loading a pair of short-circuit minor matters on the main transmission line of power divider
Member realizes the filtering characteristic of power splitter frequency low side, passband low-end cut-off frequency is reduced to 3GHz；
3. the present invention before the output port of power divider by having cascaded string calabash shape height electric impedance resonator structure
Low-pass filter unit, realize the high-end filtering characteristic of power splitter frequency, passband high end cut-off frequencies promoted to 16GHz.
Detailed description of the invention
Fig. 1 is tomograph of the invention；
Fig. 2 is upper and lower symmetrical two broadband filter structure charts in the present invention；
Fig. 3 is low-pass filter unit amplification assumption diagram in the present invention；
Fig. 4 is the input port of the embodiment of the present invention to output port transmission coefficient curve graph；
Fig. 5 is that curve graph is isolated in the return loss of the input port of the embodiment of the present invention and output port.
Specific embodiment
It elaborates with reference to the accompanying drawing to the embodiment of the present invention:
Referring to FIG. 1, FIG. 2 and FIG. 3, the present invention is mainly by microstrip dielectric 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 units 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 form, in which:
The microstrip dielectric substrate 1 uses dielectric constant for 2.45, and plate thickness is the double-sided copper-clad medium substrate of 1mm, two-sided
It is metal ground plate 5 below copper-clad plate；
Two high pass filter units 31,41 structures up and down are identical and symmetrically placed, i.e., upper high pass filter unit 31 by
A length of L1, width w1Transmission line 311 and a length of L4, width w4Two parallel connection short circuit minor matters 312 composition, same, lower height
Pass filtering unit 41 is by a length of L1', width w1' transmission line 411 and a length of L4', width w4' two parallel connection short circuit minor matters 412
It forms, wherein L1=L1'=18mm, w1=w1'=4mm, L4=L4'=3.2mm, w4=w4'=0.5mm passes through the two high passes
The high pass response of the realization of filter unit 31,41 3GHz；
Two low-pass filter units 33,43 up and down select string calabash shape height electric impedance resonator structure to realize, and
Symmetrically placed, i.e., upper low-pass filter unit 33 is made of low-impedance line 331 and high impedance line 332 respectively, wherein low-impedance line point
It is three sections, the length of left side segment and the right section is w9=2*L6+w7, wide is L7, a length of w of interlude6, width L7；High impedance
Line is divided into four sections, and every segment length is L5, wide is w5.It is same, lower low-pass filter unit 43 respectively by low-impedance line 431 with
High impedance line 432 forms, wherein low-impedance line is divided into three sections, and left side segment and the right segment length are w9'=2*L6'+w7', it is wide
For L7', a length of w of interlude6', width L7'；High impedance line is divided into four sections, and length is L5', wide 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, passes through this
Kind string calabash shape height electric impedance resonator structure can realize the lowpass response of 16GHz.
Upper high pass filter unit 31 matches connection by 50 ohm of cascade transmission lines 32 with upper low-pass filter unit 33, jointly
Broadband filter 3 on composition, same, lower broadband filter 4 is also made of this three parts, that is, descend high pass filter unit 41 with
For lower low-pass filter unit 43 by 50 ohm of cascade transmission line 42 matching connections, it is wide that they have collectively constituted symmetrical above and below two
Band filter 3 and 4.Wherein, a length of L of transmission line 323=8mm, width w3=2.73mm.
The isolation resistance 6 is arranged between two broadband filters 3 and 4 symmetrical above and below, the size of isolation resistance 6
Determine the isolation characteristic of power splitter, this example is equipped with seven resistance value same resistances altogether, it may be assumed that
R1=R2=R3=R4=R5=R6=R7=200 Ω.
Effect of the invention can be further illustrated by following emulation:
Emulation 1, emulates the transmission characteristic of ultra wide band filter response power splitter of the present invention, as a result by Fig. 4, wherein
S21(dB) curve represents the transmission characteristic between the 2 to the first output port of input port 7；S31(dB) curve represents input terminal
Mouth 2 arrives the transmission characteristic between second output terminal mouth 8.
As shown in Figure 4, which realizes the filtering function in 3-16GHz frequency range point response, point
With with insertion loss be less than 4.5dB.
Emulation 2, emulates the reflection characteristic and isolation characteristic of ultra wide band filter response power splitter of the present invention, as a 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 value is less than -8dB, output port
Between isolation S23Greater than 10dB.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (3)
1. a kind of ultra wide band filter response power divider, including microstrip dielectric substrate (1), input port (2), two output ends
Mouth (7,8), upper and lower two broadband filters (3,4)；Two broadband filters and input/output port etching are in medium substrate
The upper surface of (1), it is below medium substrate (1) metal ground plate (5)；The both ends of upper broadband filter (3) respectively with input terminal
Mouthful (2) and the first output port (7) connect, the both ends of lower broadband filter (4) respectively with input port (2) and second output terminal
Mouth (8) connection, which is characterized in that
The upper broadband filter (3), by high pass filter unit (31), stepped impedance transmission line (32), low-pass filter unit
(33) it cascades；
The high pass filter unit (31) is made of main transmission line (311) and a pair of short-circuit minor matters (312), for realizing 3GHz high
Pass filter response；
The low-pass filter unit (33) selects string calabash shape height electric impedance resonator structure, by three sections of low impedance transmission lines (331)
It is alternately cascaded with four sections of high impedance minor matters (332), for realizing 16GHz low-pass filter response；
High pass filter unit (31) matches connection by stepped impedance transmission line (32) with low-pass filter unit (33), i.e., main transmission
Line (311) and four sections of high impedance minor matters (332) are connected respectively to the both ends of stepped impedance transmission line (32), realize ultra wide band filtering
Function；
The lower broadband filter (4), it is identical as upper broadband filter (3) structure and symmetrically placed.
2. ultra wide band filter response power divider according to claim 1, which is characterized in that isolation resistance (6) setting
Between upper broadband filter (3) and lower broadband filter (4), for the first output port (7) and second output terminal mouth (8)
It is isolated, realizes ultra wide band power distribution.
3. ultra wide band filter response power divider according to claim 1, it is characterised in that microstrip dielectric substrate (1) is adopted
It is 2.45 with dielectric constant, plate thickness is the double face copper of 1mm, and the above is metal etch face as microstrip line face, below
Metal covering is as earth plate (5).
Priority Applications (1)
| 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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| CN106099298A CN106099298A (en) | 2016-11-09 |
| CN106099298B true CN106099298B (en) | 2019-03-26 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086345B (en) * | 2017-04-07 | 2018-11-30 | 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 |
| 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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| 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 |
| CN104078736A (en) * | 2013-03-26 | 2014-10-01 | 中国科学院微电子研究所 | Miniaturized broadband power divider circuit |
| 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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Patent Citations (3)
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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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