CN207039549U - The directional coupler system of the high Coupling flatness of broadband - Google Patents
The directional coupler system of the high Coupling flatness of broadband Download PDFInfo
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- CN207039549U CN207039549U CN201720748439.1U CN201720748439U CN207039549U CN 207039549 U CN207039549 U CN 207039549U CN 201720748439 U CN201720748439 U CN 201720748439U CN 207039549 U CN207039549 U CN 207039549U
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Abstract
The utility model provides a kind of directional coupler system of the high Coupling flatness of broadband, suitable for directional coupler technical field, including an at least directional coupler, at least a Chebyshev type bandpass filter, π type attenuation networks, the coupling delivery outlet of the directional coupler connects the Chebyshev type bandpass filter, the π types attenuation network, and the high coupling waveform of flatness is exported through the π types attenuation network.Whereby, the utility model realizes the coupling output flatness and return loss for improving coupler.
Description
Technical field
It the utility model is related to directional coupler technical field, more particularly to a kind of orientation of the high Coupling flatness of broadband
Coupler system.
Background technology
Directional coupler is a kind of microwave device that microwave signal is carried out to power distribution by a certain percentage.Mobile communication base
Duplexer module in system of standing, there is part to be required to add directional coupler for before monitoring it in Tx filter input ends
Hold the transmission power of power amplifier.
This usual function is required for directional coupler to have stable coupling output in hundreds of MHz broadband, i.e., high
Coupling flatness.Coupling flatness refers in allocated frequency band, the most intensity values of the directional coupler coupling delivery outlet degree of coupling with most
The difference of weak value, weighed with decibel (dB), improve Coupling flatness, sought to make coupling output fluctuating little, tend towards stability.But mesh
Such as parallel coupling, the branch coupling of preceding common coupling scheme can not accomplish high flat degree in broadband, it is therefore desirable to set
Meter person is specifying the coupling output waveform of passband to design corresponding scheme to improve coupling performance, especially phase according to directional coupler
Hope has stable coupling output in broadband.
In summary, prior art there will naturally be inconvenience and defect in actual use, and it is therefore necessary to improved.
Utility model content
For it is above-mentioned the defects of, the purpose of this utility model is the orientation coupling for providing a kind of high Coupling flatness of broadband
Clutch system, its object is to solve above-mentioned technological deficiency, there is provided broadband, the directional coupler system of the high flat degree of coupling.
The utility model provides a kind of directional coupler system of the high Coupling flatness of broadband, including at least one orientation coupling
Clutch, at least a Chebyshev type bandpass filter, π type attenuation networks, the coupling delivery outlet connection institute of the directional coupler
Chebyshev type bandpass filter, the π types attenuation network are stated, the high coupled wave of flatness is exported through the π types attenuation network
Shape.
According to the directional coupler system of the high Coupling flatness of broadband described in the utility model, the Chebyshev type band
The LC resonance circuits that bandpass filter includes parallel with one another and series connection electric capacity, inductance is formed, the π types attenuation network are included extremely
Few three resistance, the external load of directional coupler.
According to the directional coupler system of the high Coupling flatness of broadband described in the utility model, the Chebyshev type band
The electric capacity, the resistance of bandpass filter are adjustable parameter, and the resistance of the π types attenuation network is the electricity of adjustable parameter
Resistance.
According to the directional coupler system of the high Coupling flatness of broadband described in the utility model, the Chebyshev type band
Bandpass filter is that three rank LC resonance circuits are formed, each 3 of electric capacity, inductance.
According to the directional coupler system of the high Coupling flatness of broadband described in the utility model, the Chebyshev type band
The passband of bandpass filter is wider than 551~1167MHz.
According to the directional coupler system of the high Coupling flatness of broadband described in the utility model, the Chebyshev type band
The direction of the passband waveform of bandpass filter is with coupling the direction of waveform on the contrary, described in warp in the same frequency band of the directional coupler
Output waveform becomes flat after π type attenuation networks.
In summary, the utility model is declined by improving directional coupler, increase Chebyshev type bandpass filter, π types
Subtracting network, realize in 551~1167MHz frequency bands that the degree of coupling is about 40dB, flatness is less than 0.5dB, and output return loss is less than-
18dB directional coupler system, whereby, the utility model realize the coupling output flatness and return loss for improving coupler.
Brief description of the drawings
Fig. 1 is the structural representation of the directional coupler system of the high Coupling flatness of the utility model broadband；
Fig. 2 is the circuit knot of the preferred embodiment of the directional coupler system of the high Coupling flatness of the utility model broadband
Structure schematic diagram；
Fig. 3 A are Chebyshev's bandpass filterings of the directional coupler system of the high Coupling flatness of the utility model broadband
The coupling waveform diagram of device；
Fig. 3 B are the couplings of the directional coupler system preferred orientation coupler of the high Coupling flatness of the utility model broadband
Close waveform diagram；
Fig. 4 is the directional coupler system coupling output principle schematic diagram of the high Coupling flatness of the utility model broadband；
Fig. 5 is the coupling output waveform signal of the directional coupler system of the high Coupling flatness of the utility model broadband
Figure；
Fig. 6 is the directional coupler system output return loss schematic diagram of the high Coupling flatness of the utility model broadband.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
In order to solve the above problems, the utility model provides a kind of directional coupler system of the high Coupling flatness of broadband
100, the parts in the system are hardware cell or software and hardware combining unit.
With reference to illustrating, as shown in Fig. 1~Fig. 2, the orientation of the high Coupling flatness of broadband provided by the utility model
Coupler system 100, including an at least directional coupler 10, at least a Chebyshev type bandpass filter 20, π type attenuation networks
30, the coupling delivery outlet 11 of the directional coupler 10 connects the Chebyshev type bandpass filter 20, the π types attenuation network
Network, the high coupling waveform of flatness is exported through the π types attenuation network.
The directional coupler system 100 of the high Coupling flatness of broadband, the Chebyshev type bandpass filter 20 include
The LC resonance circuits that parallel with one another and series connection electric capacity, inductance are formed, the π types attenuation network include at least three resistance, and one
Individual to be connected to the delivery outlet of Chebyshev type bandpass filter 20, remaining is in parallel therewith in branch.
In order to realize that the device of production corresponds to actual needs, the orientation coupling of the high Coupling flatness of broadband in test designs
Clutch system 100, the electric capacity, the resistance of the Chebyshev type bandpass filter 20 are adjustable parameter, and the π types decline
The resistance for subtracting network 30 is the resistance of adjustable parameter.As the embodiment of alternative, the parts of non-adjustable parameter are used to give birth to
After producing design typification, the utility model is carried out producing.
It is preferred that the directional coupler system 100 of the high Coupling flatness of broadband, the Chebyshev type bandpass filtering
Device 20 is that three rank LC resonance circuits are formed, each 3 of electric capacity, inductance.
Further, the directional coupler system 100 of the high Coupling flatness of broadband, Chebyshev type bandpass filter
20 passband is wider than 551~1167MHz.
The directional coupler system 100 of the high Coupling flatness of broadband, it is critical that the Chebyshev type bandpass filtering
The direction of the passband waveform of device is with coupling the direction of waveform on the contrary, by the π types in the same frequency band of the directional coupler
Output waveform is changed into flat after attenuation network, while exports return loss and also improve.
It is about 40dB that a degree of coupling in 551~1167MHz frequency bands is devised in the utility model preferred embodiment, flat
Degree is less than 0.5dB, and output return loss is less than the directional coupler system 100 of -18dB high Coupling flatness of broadband, comprising
One wide band directional coupler 10, a three rank Chebyshev type bandpass filters 20 and a π types attenuation network 30.Greatly
Annexation is caused as shown in figure 1, what is selected in the present embodiment is the wide band orientation that the conventional degree of coupling is about 30dB on the market
Coupler 10, primary input and main output and external load R12, load R12 is 50 Europe, in 551~1167MHz, such as Fig. 2
Shown preferred structure, shown in Fig. 3 B its couple delivery outlet survey flatness is more than 1.5dB, can not meet system and be less than
0.5dB requirement, freq=889.0MHz in freq=551.0MHz in m1, dB (S (2,1))=- 31.872, m2, dB (S (2,
1))=- 31.366, freq=1.167GHz in peak (max) m3, dB (S (2,1))=- 30.084, it is therefore desirable to design one
Set optimization circuit improves its Coupling flatness.
Broadband directional coupler 10 is in the similar parabola that Open Side Down of the coupling measured waveform of delivery outlet 11, optimization circuit
It make use of Chebyshev type bandpass filter 20, preferably three rank LC resonance circuits, wherein inductance L9, L10, L11 electric capacity
The circuit that C10, C11, C12 are built, inductance L9, C10 series connection, then be connected with L10, C11, L11, C12 parallel with one another, with
Production needs to adjust the parameter value of exponent number and each component, and passband waveform as shown in Figure 3A, the ripple such as has in passband
The characteristic of fluctuation, an amplitude is built in same frequency band improves Coupling flatness close to the waveform of opening upwards, required such as Fig. 3 A
The Chebyshev type bandpass filter 20 wanted, freq=in freq=551.0MHz in m1, dB (S (2,1))=- 0.279dB, m2
Freq=883.0MHz in 1.167GHz, dB (S (2,1))=- 0.517dB, minimum point (valley) m3, dB (S (2,1))=-
1.803dB, optimum ideals are similar to described in Fig. 4.Due to output port can be caused after adding this Chebyshev type bandpass filter 20
Impedance mismatching, return loss are deteriorated, but by the use of π types attenuation network 30 (by the resistance R9 and R10, R11 as branch of trunk
The circuit built is as shown in the π types attenuation network 30 in Fig. 2) degree of coupling is decayed into 40dB, so both met the coupling of system
Right requirement improves output return loss again, reaches the design object realized shown in Fig. 4.
During the present embodiment actual measurement, using system requirements as target, with reference to the actual measurement number of the coupling output of directional coupler 10
According to first with ADS, (Advanced Design System, Agilent Agilent companies of the U.S. produce what is possessed to the present invention
Electronic design automation software) a three ranks Chebyshev type bandpass filter 20 of design of Simulation and π types attenuation network 30
Combinational circuit optimizes directional coupler system parameters；Again wiring board and lower plate are drawn according to artificial circuit；Finally plate to be returned
Vector network analyzer analysis system is followed by, according to actual conditions semifixed resistor, value inductively or capacitively to meeting that system is complete
Portion requires.
The emulation of the directional coupler system 100 of the high Coupling flatness of broadband, debugging and testing process are as follows：
First, a Chebyshev type bandpass filter is emulated using ADS wave filter Design wizards instrument, its passband is existed
The output of 551~1167MHz frequency bands just couples class parabolic waveform opening opposite magnitude with selected 30dB directional couplers 10
It is close, such as Fig. 3 A, Fig. 3 B；
Second, export the circuit for generating inductance capacitance composition by designing；It is understood that from design of Simulation derived electric capacity,
Inductance value is in accordance with theoretical deduction and drawn, its precision is often too high and practical application in not necessarily have equivalence, it is therefore desirable to
Regular size inductance capacitance proximate to it is selected with reference to simulation value.Finally selected circuit is as shown in Fig. 2 Fig. 2 includes three
Rank LC resonance circuits, the circuit constitute Chebyshev's bandpass filter 20 that a passband is wider than 551~1167MHz, and it is logical
With the interior ripple that amplitude unequal width be present and differ, we be exactly to utilize it in 551~1167MHz frequency bands with it is selected
The coupling class parabolic waveform openings of 30dB directional couplers 10 is opposite, amplitude is close ripple optimizes directional coupler 10
Coupling flatness；
3rd, the differential loss of three rank Chebyshev type bandpass filters 20 is about 2dB, plus the about 30dB's of directional coupler 10
The degree of coupling, in order to reach the requirement of the system 40dB degree of coupling, it need to also be added in circuit rear end by three resistance R9, R10, R11 groups
Into decay about 8dB π types attenuation network 30, this attenuation network also improves output return loss.The high coupling of above broadband is flat
The circuit diagram of the directional coupler system 100 of smooth degree is as shown in Figure 2.
It should be noted that the degree of coupling of different model directional coupler 10 not necessarily may each be about 30dB, output waveform is not yet
It is bound to as shown in Figure 3 B, therefore for optimizing the Chebyshev type bandpass filter exponent number of Coupling flatness and inductance capacitance arrangement
It is required for being selected according to actual conditions with value, while the value of three resistance also will be according to directional coupler in π types attenuation network 30
10 degree of coupling and the differential loss adjustment of Chebyshev's bandpass filter 20, could so meet requirement of system design；
4th, wiring board is drawn according to artificial circuit and figure below is drawn a design, vector network analyzer is used after plate paster to be returned
Analysis.The actual existing difference between emulation can cause result to have slight deviations, be needed if actual measurement Coupling flatness is poor
Six capacitor and inductors of fine setting three rank bandpass filters of composition are until meet to require, if the orientation of the high Coupling flatness of broadband
The system actual measurement degree of coupling of coupler system 100 needs to change the resistance value in " π types " attenuation network, coupling not in 40 ± 1dB
Close it is partially strong just by R9 change it is big or R10 and R11 are changed it is small, it is on the weak side just conversely.S2P data ADS to be imported is preserved to be further analyzed；
5th, S2P data are established in ADS and import model, the S2P data of the 4th step actual measurement are imported into model analysis.It is defeated
Go out freq=551.0MHz in oscillogram such as Fig. 5, m1, freq=1.167GHz, dB in dB (S (2,1))=- 40.050dB, m2
Freq=983.0MHz in (S (2,1))=- 40.136dB, peak (max) m3, dB (S (2,1))=- 39.895dB, may be used also
To find out that Coupling flatness has been less than 0.25dB and the degree of coupling is also within 40 ± 0.5dB, while in Fig. 6, freq=in m1
Freq=802.0MHz in 551.0MHz, dB (S (2,2))=- 28.083dB, peak (peak) m2, dB (S (2,2))=-
Freq=1.167GHz in 23.234dB, m3, dB (S (2,2))=- 29.152dB, it is seen that output return loss has also met will
Ask.
In summary, the utility model is declined by improving directional coupler, increase Chebyshev type bandpass filter, π types
Subtract network, the degree of coupling is about 40dB in 551~1167MHz frequency bands, and flatness is less than 0.5dB, and output return loss is less than -18dB
Directional coupler system, whereby, the utility model realizes the coupling output flatness and return loss for improving coupler.
Certainly, the utility model can also have other various embodiments, without departing substantially from the utility model spirit and its essence
In the case of, those skilled in the art work as can make various corresponding changes and deformation according to the utility model, but these
Corresponding change and deformation should all belong to the scope of the claims appended by the utility model.
Claims (6)
- A kind of 1. directional coupler system of the high Coupling flatness of broadband, it is characterised in thatIncluding an at least directional coupler, at least a Chebyshev type bandpass filter, π type attenuation networks, the directional couple The coupling delivery outlet of device connects the Chebyshev type bandpass filter, the π types attenuation network, through the π types attenuation network Export the high coupling waveform of flatness.
- 2. the directional coupler system of the high Coupling flatness of broadband according to claim 1, it is characterised in that described to cut ratio The LC resonance circuits that snow husband's type bandpass filter includes parallel with one another and series connection electric capacity, inductance is formed, the π types attenuation network Network includes at least three resistance, the external load of directional coupler.
- 3. the directional coupler system of the high Coupling flatness of broadband according to claim 2, it is characterised in that described to cut ratio The electric capacity, the resistance for avenging husband's type bandpass filter are adjustable parameter, and the resistance of the π types attenuation network is adjustable The resistance of parameter.
- 4. the directional coupler system of the high Coupling flatness of broadband according to claim 2, it is characterised in that described to cut ratio Snow husband's type bandpass filter is that three rank LC resonance circuits are formed, each 3 of electric capacity, inductance.
- 5. the directional coupler system of the high Coupling flatness of broadband according to claim 1, it is characterised in that described to cut ratio The passband of snow husband's type bandpass filter is wider than 551~1167MHz.
- 6. the directional coupler system of the high Coupling flatness of broadband according to claim 1, it is characterised in that described to cut ratio Avenge the direction of the passband waveform of husband's type bandpass filter and the directional coupler coupled in same frequency band waveform towards phase Instead, output waveform becomes flat after the π types attenuation network.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560360A (en) * | 2018-12-11 | 2019-04-02 | 深圳飞骧科技有限公司 | A kind of directional coupler |
| CN111025217A (en) * | 2019-12-27 | 2020-04-17 | 北京无线电计量测试研究所 | Waveguide inspection piece system |
| WO2023040475A1 (en) * | 2021-09-17 | 2023-03-23 | 深圳飞骧科技股份有限公司 | Dual-microstrip-line coupler, power amplifier, related device and chip |
-
2017
- 2017-06-26 CN CN201720748439.1U patent/CN207039549U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560360A (en) * | 2018-12-11 | 2019-04-02 | 深圳飞骧科技有限公司 | A kind of directional coupler |
| CN111025217A (en) * | 2019-12-27 | 2020-04-17 | 北京无线电计量测试研究所 | Waveguide inspection piece system |
| CN111025217B (en) * | 2019-12-27 | 2022-08-30 | 北京无线电计量测试研究所 | Waveguide inspection piece system |
| WO2023040475A1 (en) * | 2021-09-17 | 2023-03-23 | 深圳飞骧科技股份有限公司 | Dual-microstrip-line coupler, power amplifier, related device and chip |
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Effective date of registration: 20190225 Address after: 518000 Guangming Street, Guangming New District, Shenzhen City, Guangdong Province, Genyu Road, Mobi Science and Technology Building Co-patentee after: Mobile Antenna Technologies (Shenzhen) Co., Ltd. Patentee after: Mobi Technology (Shenzhen) Co., Ltd. Co-patentee after: Mobile Antenna Technologies (Jian) Co., Ltd. Co-patentee after: MOBI Technologies (Xi'an) Co., Ltd. Address before: 518057 Mobi Building, No. 7, Langshan Road, North District of Nanshan High-tech Industrial Park, Shenzhen, Guangdong Province Co-patentee before: Mobile Antenna Technologies (Jian) Co., Ltd. Patentee before: Mobile Antenna Technologies (Shenzhen) Co., Ltd. Co-patentee before: MOBI Technologies (Xi'an) Co., Ltd. |
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