CN108808202A - Highly reliable close coupling directional coupler based on RF coaxial structure - Google Patents
Highly reliable close coupling directional coupler based on RF coaxial structure Download PDFInfo
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- CN108808202A CN108808202A CN201810815401.0A CN201810815401A CN108808202A CN 108808202 A CN108808202 A CN 108808202A CN 201810815401 A CN201810815401 A CN 201810815401A CN 108808202 A CN108808202 A CN 108808202A
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- Prior art keywords
- primary path
- coupling
- dielectric ring
- directional coupler
- pressure
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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
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a kind of highly reliable close coupling directional coupler based on RF coaxial structure, including epicoele, cavity of resorption and coupling main body, the coupling main body includes primary path and termination power, the primary path is cylindrical conductor, and the termination power is to have printed the circuit board of coupled microstrip line, further includes a pressure-resistant dielectric ring, the pressure resistance dielectric ring is cylinder, center is equipped with coaxial through-hole, and the primary path outer wall dimension is identical as cavity inner wall size, and in coaxial through-hole；The pressure resistance dielectric ring side or opposite sides are equipped with bar-shaped trough, the center of circle of the pressure-resistant dielectric ring of bar-shaped trough direction.Maximum service rating of the present invention up to MW grades, for the control module in system provide highly reliable, high flat degree, high direction degree close coupling signal.The highly reliable close coupling directional coupler and production method of this RF coaxial structure improve the sampling precision and stability of control signal, improve the reliability of system.
Description
Technical field
The present invention relates to a kind of couplers more particularly to a kind of highly reliable close coupling based on RF coaxial structure to orient coupling
Clutch.
Background technology
Radio frequency control module is widely used in all kinds of frequency microwave equipment, is transmitter, receiver, radio station, tester
Device important equipment in equipment and other a variety of microwave equipments.Directional coupler is in Microwave radio frequency system using extremely wide
A kind of general microwave device is the Primary Component of radio frequency control module in system.The effect of directional coupler is by certain width
Spend proportionate relationship and phase relation and transmit signal, it can be used for the isolation, separation and mixing of signal, and have it is very high it is reversed every
From.Directional coupler can be utilized for control module and provide sampled power and the sampling incident signal and anti-in microwave equipment
Penetrate signal.
With the development of electronic information technology, also higher and higher to the demand of control module in Microwave radio frequency system, it constitutes
The circuit type of directional coupler is various and differs greatly, and common are coaxial line, waveguide, microstrip line and strip line etc..Generally
In the case of, directional coupler is used for sample of signal, such as transmitter, short wave communication radio station, in order to safety guarantee mould in system
Block is measured and is monitored to working signal；The distribution and conjunction of signal are also carried out using directional coupler in some systems
At such as common 3dB directional couplers in multi-carrier frequency synthesis system；Especially positive and reflection signal precision is wanted at some
It asks in very high test equipment such as Network Analyzer, directional coupler is even more to be used as its core component.
RF coaxial directional coupler should ensure that following 2 point requirement：1, the authenticity and precision of coupled signal, should not be to master
Line signal impacts.2, coaxial configuration directional couple should have high reliability, especially coupling line under radio frequency high-power state
Should have safeguard protection between main line.1st point requires directional coupler to have very high stability, flatness and direction degree.Coupling
Right, direction degree and insertion loss these three indexs influence each other again, on a wider frequency range, directional coupler
The degree of coupling often has and significantly fluctuates, and direction degree, which by the degree of coupling restricts, to be not easy to be improved, and insertion loss is by coupling
It influences also to have rightly definitely to fluctuate.There should be foot between the main line and coupling line of 2nd point of requirement coaxial configuration directional coupler
Enough safe distances or increase safety pressure resistance protection.Safe distance is not enough or naked safeguard procedures are easily in complex environment
Under the conditions of or occur pressure resistance breakdown when power swing.Therefore, in broadband range one disclosure satisfy that system requirement
High reliability ultra wide band directional coupler has great importance.
Existing RF coaxial directional coupler generally passes through spatial electromagnetic coupling by parallel coupling bar or coupling line coupling
It closes principle and couples primary path power signal, the power of the degree of coupling is mainly adjusted by coupling bar or coupling line and primary path
Distance determines that this brings following disadvantage：1, in high-power RF system in use, primary path power is big, coupling bar
Or coupling line by control its between primary path at a distance from adjust the degree of coupling because air dielectric pressure resistance is small, typically about
1kV/mm~2kV/mm makes control module that can not extract to ensure that enough safe distances can not obtain stronger coupled signal
Go out best detection signal.2, coupling bar or coupling line connect the parasitic parameter that transition generates with coupler internal circuit and also can
Connecting curve is influenced, is difficult to obtain good flatness and direction degree under wider frequency band.3, in order to ensure high-power condition
Under reliability, the size of coaxial cavity is often larger, therefore the volume of entire coupler is also bigger, high processing costs and processing
Difficulty is larger.
Invention content
The purpose of the present invention is that providing one kind solves the above problems, and can be system under the conditions of high power work
In control module highly reliable, high flat degree is provided, the height based on RF coaxial structure of close coupling signal of high direction degree can
By close coupling directional coupler.
To achieve the goals above, the technical solution adopted by the present invention is such：It is a kind of based on RF coaxial structure
Highly reliable close coupling directional coupler, including epicoele, cavity of resorption and coupling main body, the coupling main body include primary path and coupling electricity
Road, the primary path are cylindrical conductor, and the termination power is to have printed the circuit board of coupled microstrip line, wherein coupling microstrip
Line is close to one edge of circuit board and parallel with the edge；
The primary path outer wall is coated with a cylindrical pressure-resistant dielectric ring, and the pressure resistance dielectric ring is coaxially disposed with primary path,
The pressure resistance dielectric ring side or opposite sides are equipped with bar-shaped trough, and the bar shaped slot length is set along pressure-resistant dielectric ring length direction
It sets, degree is radially arranged along pressure-resistant dielectric ring；
The termination power is arranged in a one-to-one correspondence with bar-shaped trough, and the edge that coupled microstrip line is arranged in termination power is inserted into bar shaped
In slot, and coupled microstrip line is parallel with primary path after insertion, and the coupled microstrip line is coupled main logical by way of electromagnetic coupling
Road power signal forms connecting curve；
The epicoele and cavity of resorption are cuboid, and the two is bonded, and after fitting, epicoele and cavity of resorption are internally provided with for pressure-resistant medium
The groove body of ring insertion.
As preferred：The primary path is made of copper or copper alloy.
As preferred：The pressure resistance dielectric ring is made of polytetrafluoroethylene (PTFE), is one section or two-stage structure.
As preferred：The compensation circuit for adjusting connecting curve flatness, the compensation are additionally provided on the circuit board
Circuit includes a LC series circuits, the LC series circuits two concatenated resistance in parallel, the circuit after parallel connection, one end of inductance
Connect coupling port, one resistance eutral grounding of one end of capacitance is also grounded by a LC parallel circuits between two concatenated resistance, described
Inductance in LC series circuits is tap inductor, and is connected over the ground a compensating electric capacity in tapping point.
As preferred：Alternating floor thin-walled between the bar-shaped trough and the coaxial through-hole of pressure-resistant dielectric ring, the thin-walled are minimum thick
Degree meet not by primary path by high-power signal voltage breakdown.
Compared with the prior art, the advantages of the present invention are as follows：Compared with the prior art, the advantages of the present invention are as follows：Setting
Pressure-resistant dielectric ring instead of original air dielectric provides pressure-resistant protection for primary path.The breakdown voltage of air and air it is wet
The relationship of degree, air pressure and temperature is very close, and humidity is bigger, air pressure is lower, the more high then breakdown voltage of temperature is smaller.Under usual state
Think that the breakdown voltage of air is about that 1kV/mm~2kV/mm. is used as pressure-resistant dielectric ring, breakdown voltage using polytetrafluoroethylene (PTFE)
Not less than 10kV/mm, and this material property is stablized, substantially not by such environmental effects, it is ensured that under broadband close coupling state
Compressive resistance and reliability effectively increase reliability of coupler under the conditions of high power work.And coaxial configuration coupler
Coupling main body processing consistency it is good, parasitic parameter is small, ensure that consistency of performance of the coupler in ultra wide band frequency.
It is also provided with compensation circuit, which is made of resistor, capacitor and inductor, compared with traditional scheme, benefit of the invention
It repays in circuit, inductor in centre cap, connect a compensating electric capacity over the ground by tapping point, which influences connecting curve and exist
The high-end flatness of frequency can make degree of coupling curve by adjusting the compensating electric capacity within the scope of a 1MHz~1200MHz
Obtain high flat degree.
The present invention is essentially different in structure with traditional RF coaxial structure directional coupler, and termination power has
Pressure-resistant dielectric ring provides high voltage protective, can obtain the degree of coupling for being better than conventional radio frequency coaxial configuration coupler, this is that tradition is penetrated
Ability not available for frequency coaxial configuration coupler.
In the present invention, directional coupler can be under the conditions of high power work, and providing height for the control module in system can
It leans on, the close coupling signal of high flat degree, high direction degree.The highly reliable close coupling directional coupler and system of this RF coaxial structure
The sampling precision and stability that control signal is improved as method, improve the reliability of system.
Highly reliable close coupling directional coupler based on RF coaxial structure have the characteristics that miniaturization, it is light-weighted, largely
The inner space for saving control module, simplifies installation process, reduces product cost.
Highly reliable close coupling directional coupler based on RF coaxial structure is believed by termination power direct couoling power
Number, the surface mount elements that compensation network uses parasitic parameter small, product bandwidth, relatively traditional coaxial configuration directional coupler,
Without adjusting inductance or capacitance parameter when debugging, also solves the secondary debugging problem after encapsulation, it is only necessary to disposably adjust coupling
Circuit is closed at a distance from primary path, effectively increases debugging efficiency.
Description of the drawings
Fig. 1 is the stereogram of embodiment 1；
Fig. 2 is the structural schematic diagram of coupling main body in embodiment 1；
Fig. 3 is the schematic diagram that one section of pressure-resistant dielectric ring opens bar-shaped trough in embodiment 1；
Fig. 4 is the stereogram of embodiment 2；
Fig. 5 is the structural schematic diagram of coupling main body in embodiment 2；
Fig. 6 is one section of pressure-resistant dielectric ring notching construction schematic diagram in embodiment 2.
Fig. 7 is conventional directional coupler coupled structure figure in the prior art；
Fig. 8 is directional coupler schematic diagram；
Fig. 9 is the improvement figure of inductance in the present invention；
Figure 10 is the connecting curve figure before improving；
Figure 11 is the connecting curve figure of the present invention.
In figure：1, epicoele；2, cavity of resorption；3, coupling main body；4, primary path；5, pressure-resistant dielectric ring；6, circuit board；7, bar shaped
Slot；8, air dielectric；9, coupling bar.
Specific implementation mode
The present invention will be further described with reference to the accompanying drawings.
Embodiment 1：Referring to Fig. 7, in the prior art, RF coaxial directional coupling structure be primary path 4, air dielectric 8,
The structures such as coupling bar 9 are constituted, and the power of the degree of coupling is mainly adjusted by coupling bar 9 or coupling line at a distance from primary path 4
Distance determines.In 8 small, the typically about 1kV/mm~2kV/mm of pressure resistance of air dielectric, coupling bar 9 or coupling line and coupler
The parasitic parameter that portion's circuit connection transition generates can also influence connecting curve, be difficult to obtain under wider frequency band good flat
Degree and direction degree.
Referring to Fig. 1 to Fig. 3, Fig. 8 to Figure 11, the present invention is a kind of highly reliable close coupling orientation based on RF coaxial structure
Coupler, including epicoele 1, cavity of resorption 2 and coupling main body 3, the coupling main body 3 include primary path 4 and termination power, and the master is logical
Road 4 is cylindrical conductor, and the termination power is to have printed the circuit board 6 of coupled microstrip line, and wherein coupled microstrip line is close to electricity
6 one edge of road plate and parallel with the edge；
4 outer wall of the primary path is coated with a cylindrical pressure-resistant dielectric ring 5, and the pressure resistance dielectric ring 5 is coaxially set with primary path 4
It sets, 5 side of the pressure resistance dielectric ring is equipped with bar-shaped trough 7, and 7 length of the bar-shaped trough is along the 5 length direction setting of pressure-resistant dielectric ring, degree
Along the 5 radial setting of pressure-resistant dielectric ring；
The termination power is arranged in a one-to-one correspondence with bar-shaped trough 7, and the edge that coupled microstrip line is arranged in termination power is inserted into item
In shape slot 7, and coupled microstrip line is parallel with primary path 4 after insertion, and the coupled microstrip line is coupled by way of electromagnetic coupling
4 power signal of primary path forms connecting curve；
The epicoele 1 and cavity of resorption 2 are cuboid, and the two is bonded, and after fitting, epicoele 1 and cavity of resorption 2 are internally provided with for pressure resistance
The groove body that dielectric ring 5 is embedded in.
In the present embodiment：The primary path 4 is made of copper or copper alloy.
The pressure resistance dielectric ring 5 is made of polytetrafluoroethylene (PTFE), is one section or two-stage structure.
The compensation circuit for adjusting connecting curve flatness is additionally provided on the circuit board 6, the compensation circuit includes
One LC series circuits, the LC series circuits two concatenated resistance in parallel, the circuit after parallel connection, a termination coupled end of inductance
Mouthful, one resistance eutral grounding of one end of capacitance also passes through LC parallel circuits ground connection, the LC series electricals between two concatenated resistance
Inductance in road is tap inductor, and is connected over the ground a compensating electric capacity in tapping point.
Alternating floor thin-walled between the bar-shaped trough 7 and the coaxial through-hole of pressure-resistant dielectric ring 5, the thin-walled minimum thickness meet not
By primary path 4 by high-power signal voltage breakdown.
Referring to Fig. 8 it is found that LC series electrical routing capacitances C1, the first inductance L1 are connected in series, LC parallel circuits by capacitance C2,
Second inductance L2 is formed in parallel.First inductance L1 is tap inductor, and is formed in tapping point to being located in one compensating electric capacity of series connection
Resonant tank, can effectively improve the flatness of connecting curve, widen coupler bandwidth.
Referring to Fig. 9 and Figure 10, before being improved using the present invention and improved 50d coupler coupled signal curve graphs can
Know, the present invention has better flatness after improvement.
Embodiment 2：Referring to Fig. 4 to Fig. 6, pressure resistance dielectric ring 5 both sides are equipped with bar-shaped trough 7, remaining and 1 phase of embodiment
Together.
Claims (5)
1. a kind of highly reliable close coupling directional coupler based on RF coaxial structure, including epicoele, cavity of resorption and coupling main body, institute
It includes primary path and termination power to state coupling main body, it is characterised in that：The primary path is cylindrical conductor, the termination power
To have printed the circuit board of coupled microstrip line, wherein coupled microstrip line is close to one edge of circuit board and parallel with the edge；
The primary path outer wall is coated with a cylindrical pressure-resistant dielectric ring, and the pressure resistance dielectric ring is coaxially disposed with primary path,
The pressure resistance dielectric ring side or opposite sides are equipped with bar-shaped trough, and the bar shaped slot length is set along pressure-resistant dielectric ring length direction
It sets, degree is radially arranged along pressure-resistant dielectric ring；
The termination power is arranged in a one-to-one correspondence with bar-shaped trough, and the edge that coupled microstrip line is arranged in termination power is inserted into bar shaped
In slot, and coupled microstrip line is parallel with primary path after insertion, and the coupled microstrip line is coupled main logical by way of electromagnetic coupling
Road power signal forms connecting curve；
The epicoele and cavity of resorption are cuboid, and the two is bonded, and after fitting, epicoele and cavity of resorption are internally provided with for pressure-resistant medium
The groove body of ring insertion.
2. the highly reliable close coupling directional coupler according to claim 1 based on RF coaxial structure, it is characterised in that：
The primary path is made of copper or copper alloy.
3. the highly reliable close coupling directional coupler according to claim 1 based on RF coaxial structure, it is characterised in that：
The pressure resistance dielectric ring is made of polytetrafluoroethylene (PTFE), is one section or two-stage structure.
4. the highly reliable close coupling directional coupler according to claim 1 based on RF coaxial structure, it is characterised in that：
The compensation circuit for adjusting connecting curve flatness is additionally provided on the circuit board, the compensation circuit includes a LC series electricals
Road, the LC series circuits two concatenated resistance in parallel, the circuit after parallel connection, a termination coupling port of inductance, capacitance
One resistance eutral grounding of one end is also grounded by a LC parallel circuits between two concatenated resistance, the electricity in the LC series circuits
Sense is tap inductor, and connects over the ground a compensating electric capacity in tapping point.
5. the highly reliable close coupling directional coupler according to claim 1 based on RF coaxial structure, it is characterised in that：
Alternating floor thin-walled between the bar-shaped trough and the coaxial through-hole of pressure-resistant dielectric ring, the thin-walled minimum thickness satisfaction are not led to by primary path
The high-power signal voltage breakdown crossed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810815401.0A CN108808202B (en) | 2018-07-24 | 2018-07-24 | High-reliability strong-coupling directional coupler based on radio frequency coaxial structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810815401.0A CN108808202B (en) | 2018-07-24 | 2018-07-24 | High-reliability strong-coupling directional coupler based on radio frequency coaxial structure |
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| CN108808202A true CN108808202A (en) | 2018-11-13 |
| CN108808202B CN108808202B (en) | 2023-08-11 |
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| CN201810815401.0A Active CN108808202B (en) | 2018-07-24 | 2018-07-24 | High-reliability strong-coupling directional coupler based on radio frequency coaxial structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696056A (en) * | 2022-04-14 | 2022-07-01 | 北京星英联微波科技有限责任公司 | Ultra-wideband high-power dual directional coupler |
| CN115084816A (en) * | 2022-07-21 | 2022-09-20 | Oppo广东移动通信有限公司 | Radio frequency circuit, passive circuit and electronic equipment |
| WO2023109676A1 (en) * | 2021-12-16 | 2023-06-22 | 华为技术有限公司 | Coupler and signal detection system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023109676A1 (en) * | 2021-12-16 | 2023-06-22 | 华为技术有限公司 | Coupler and signal detection system |
| CN114696056A (en) * | 2022-04-14 | 2022-07-01 | 北京星英联微波科技有限责任公司 | Ultra-wideband high-power dual directional coupler |
| CN115084816A (en) * | 2022-07-21 | 2022-09-20 | Oppo广东移动通信有限公司 | Radio frequency circuit, passive circuit and electronic equipment |
| CN115084816B (en) * | 2022-07-21 | 2024-03-01 | Oppo广东移动通信有限公司 | Radio frequency circuit, passive circuit and electronic equipment |
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| Publication number | Publication date |
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| CN108808202B (en) | 2023-08-11 |
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