CN208433502U - 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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- CN208433502U CN208433502U CN201821170121.0U CN201821170121U CN208433502U CN 208433502 U CN208433502 U CN 208433502U CN 201821170121 U CN201821170121 U CN 201821170121U CN 208433502 U CN208433502 U CN 208433502U
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Abstract
The utility model 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 coupling circuit, the primary path is cylindrical conductor, and the coupling circuit are 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 is located in coaxial through-hole；The pressure resistance dielectric ring side or opposite sides are equipped with strip groove, the center of circle of the pressure-resistant dielectric ring of strip groove direction.The utility model maximum service rating provides the close coupling signal of highly reliable, high flat degree, high direction degree up to MW grades, for the control module in system.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 utility model relates to a kind of coupler more particularly to a kind of highly reliable close coupling based on RF coaxial structure are fixed
To coupler.
Background technique
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 reversely 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 of directional coupler is many kinds of 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 3dB directional coupler common in multi-carrier frequency synthesis system；Especially wanted in the precision of some pairs of forward directions and reflection signal
Ask in very high test equipment such as Network Analyzer, directional coupler be even more be used as its core component come using.
RF coaxial directional coupler should ensure that following 2 point requirement: the 1, 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 of requirement directional coupler has 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 by the degree of coupling restricts and is also difficult to obtain raising, 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 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 can satisfy system requirement
High reliability ultra wide band directional coupler has great importance.
Existing RF coaxial directional coupler generally passes through parallel coupling bar or coupling line coupling passes through spatial electromagnetic 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 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 extract control module can not to ensure that enough safe distances can not obtain stronger coupled signal
Optimal detection signal out.2, the parasitic parameter that coupling bar or coupling line connect transition generation with coupler internal circuit also can
Connecting curve is influenced, is difficult to obtain good flatness and direction degree under wider frequency band.3, in order to guarantee high-power condition
Under reliability, the size of coaxial cavity is often larger, therefore the volume of entire coupler is also bigger, and processing cost is high and processes
Difficulty is larger.
Summary of the invention
The purpose of this utility model is that providing one kind solves the above problems, and can be under the conditions of high power work
Control module in system provide highly reliable, high flat degree, high direction degree close coupling signal based on RF coaxial structure
Highly reliable close coupling directional coupler.
To achieve the goals above, the technical solution adopted in the utility model is such that a kind of based on RF coaxial knot
The highly reliable close coupling directional coupler of structure, including epicoele, cavity of resorption and coupling main body, the coupling main body include primary path and coupling
Circuit is closed, the primary path is cylindrical conductor, and the coupling circuit are 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 set with primary path
It sets, the pressure resistance dielectric ring side or opposite sides are equipped with strip groove, and the bar shaped slot length is along pressure-resistant dielectric ring length direction
Setting, degree are arranged radially along pressure-resistant dielectric ring；
The coupling circuit are arranged in a one-to-one correspondence with strip groove, and the edge insertion of coupled microstrip line is arranged in coupling circuit
In strip groove, and coupled microstrip line is parallel with primary path after insertion, and the coupled microstrip line is coupled by way of electromagnetic coupling
Primary path power signal forms connecting curve；
The epicoele and cavity of resorption are cuboid, and the two is bonded, and after fitting, are equipped with inside epicoele and cavity of resorption for pressure resistance
The groove body of dielectric 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: being additionally provided with the compensation circuit for adjusting connecting curve flatness, the compensation on the circuit board
Circuit includes a LC series circuit, the LC series circuit 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 capacitor is also grounded between two concatenated resistance by a LC parallel circuit, described
Inductance in LC series circuit is tap inductor, and is connected over the ground a compensating electric capacity in tapping point.
As preferred: alternating floor thin-walled between the strip groove and the coaxial through-hole of pressure-resistant dielectric ring, the thin-walled are minimum thick
Degree meets the high-power signal voltage breakdown not passed through by primary path.
Compared with the prior art, the advantages of the utility model are: compared with prior art, the advantages of the utility model
In: pressure-resistant dielectric ring, which is provided with, instead of original air dielectric provides pressure-resistant protection for primary path.The breakdown voltage and sky of air
The relationship of the humidity of gas, 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.Usually
The breakdown voltage that air is thought under state is about that 1kV/mm~2kV/mm. uses polytetrafluoroethylene (PTFE) as pressure-resistant dielectric ring, is hit
Voltage is worn not less than 10kV/mm, and this material property is stablized, substantially not by such environmental effects, it is ensured that broadband close coupling shape
Compressive resistance and reliability under state effectively increase reliability of coupler under the conditions of high power work.And coaxial configuration
The coupling main body processing consistency of coupler is good, and parasitic parameter is small, ensure that performance of the coupler in ultra wide band frequency
Consistency.It is also provided with compensation circuit, which is made of resistor, capacitor and inductor, compared with traditional scheme, this reality
With in novel compensation circuit, inductor in centre cap, connect a compensating electric capacity over the ground by tapping point, which influences
The connecting curve flatness high-end in frequency can make by adjusting the compensating electric capacity within the scope of a 1MHz~1200MHz
Degree of coupling curve obtains high flat degree.
The utility model is essentially different in structure with traditional RF coaxial structure directional coupler, coupling electricity
Road has pressure-resistant dielectric ring to provide high voltage protective, and the available degree of coupling for being better than conventional radio frequency coaxial configuration coupler, this is to pass
Ability not available for system RF coaxial structure Coupling device.
In the utility model, directional coupler can be provided under the conditions of high power work for the control module in system
The close coupling signal of highly reliable, high flat degree, high direction degree.The highly reliable close coupling directional coupler of this RF coaxial structure
And production method improves the sampling precision and stability of control signal, improves 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 coupling circuit direct couoling power
Number, the compensation network surface mount elements small using parasitic parameter, product bandwidth, relatively traditional coaxial configuration directional coupler,
Without adjusting inductance or capacitance parameter when debugging, the secondary debugging problem after also solving encapsulation, it is only necessary to disposably adjust coupling
Circuit is closed at a distance from primary path, effectively increases debugging efficiency.
Detailed description of the invention
Fig. 1 is the perspective view 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 strip groove in embodiment 1；
Fig. 4 is the perspective view 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 utility model；
Figure 10 is the connecting curve figure before improving；
Figure 11 is the connecting curve figure of the utility model.
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 embodiment
Below in conjunction with attached drawing, the utility model is described in further detail.
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 also will affect 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 utility model is a kind of highly reliable close coupling based on RF coaxial structure
Directional coupler, including epicoele 1, cavity of resorption 2 and coupling main body 3, the coupling main body 3 includes primary path 4 and coupling circuit, described
Primary path 4 is cylindrical conductor, and the coupling circuit are to have printed the circuit board 6 of coupled microstrip line, and wherein coupled microstrip line leans on
Nearly 6 one edge of circuit board and parallel with the edge；
4 outer wall of primary path is coated with a cylindrical pressure-resistant dielectric ring 5, and the pressure resistance dielectric ring 5 and primary path 4 are same
Axis setting, pressure resistance 5 side of dielectric ring are equipped with strip groove 7, and 7 length of strip groove is set along pressure-resistant 5 length direction of dielectric ring
It sets, degree is arranged radially along pressure-resistant dielectric ring 5；
The coupling circuit are arranged in a one-to-one correspondence with strip groove 7, and the edge that coupled microstrip line is arranged in coupling circuit is inserted
Enter in strip groove 7, and coupled microstrip line is parallel with primary path 4 after insertion, the coupled microstrip line is by way of electromagnetic coupling
4 power signal of primary path is coupled, connecting curve is formed；
The epicoele 1 and cavity of resorption 2 are cuboid, and the two is bonded, and after fitting, are equipped with and supply inside epicoele 1 and cavity of resorption 2
The groove body that pressure-resistant 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 circuit, the LC series circuit 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 capacitor is also grounded by a LC parallel circuit between two concatenated resistance, the LC series electrical
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 strip groove 7 and the coaxial through-hole of pressure-resistant dielectric ring 5, the thin-walled minimum thickness meet not
The high-power signal voltage breakdown passed through by primary path 4.
Referring to Fig. 8 it is found that LC series electrical routing capacitance C1, the first inductance L1 are connected in series, LC parallel circuit by capacitor C2,
Second inductance L2 is formed in parallel.First inductance L1 is tap inductor, and is formed in tapping point to one compensating electric capacity of series connection is located in
Resonant tank, can effectively improve the flatness of connecting curve, widen coupler bandwidth.
Referring to Fig. 9 and Figure 10, preceding and improved 50d coupler coupled signal curve graph is improved using the utility model
It is found that the utility model has better flatness after improving.
Embodiment 2: arriving Fig. 6 referring to fig. 4, and 5 two sides of the pressure resistance dielectric ring are equipped with strip groove 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
Stating coupling main body includes primary path and coupling circuit, it is characterised in that: the primary path is cylindrical conductor, the coupling circuit
For the circuit board for having printed 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 and primary path are coaxially disposed,
The pressure resistance dielectric ring side or opposite sides are equipped with strip groove, and the bar shaped slot length is set along pressure-resistant dielectric ring length direction
It sets, degree is arranged radially along pressure-resistant dielectric ring；
The coupling circuit are arranged in a one-to-one correspondence with strip groove, and the edge that coupled microstrip line is arranged in coupling circuit 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, are equipped with inside epicoele and cavity of resorption 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 electrical
Road, the LC series circuit two concatenated resistance in parallel, the circuit after parallel connection, a termination coupling port of inductance, capacitor
One resistance eutral grounding of one end is also grounded between two concatenated resistance by a LC parallel circuit, the electricity in the LC series circuit
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 strip groove 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 |
|---|---|---|---|
| CN201821170121.0U CN208433502U (en) | 2018-07-24 | 2018-07-24 | Highly reliable close coupling directional coupler based on RF coaxial structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821170121.0U CN208433502U (en) | 2018-07-24 | 2018-07-24 | Highly reliable close coupling directional coupler based on RF coaxial structure |
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| CN208433502U true CN208433502U (en) | 2019-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821170121.0U Active CN208433502U (en) | 2018-07-24 | 2018-07-24 | Highly reliable close coupling directional coupler based on RF coaxial structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108808202A (en) * | 2018-07-24 | 2018-11-13 | 西南应用磁学研究所 | Highly reliable close coupling directional coupler based on RF coaxial structure |
| CN110780112A (en) * | 2019-10-25 | 2020-02-11 | 武汉滨湖电子有限责任公司 | High flatness power detection device |
-
2018
- 2018-07-24 CN CN201821170121.0U patent/CN208433502U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108808202A (en) * | 2018-07-24 | 2018-11-13 | 西南应用磁学研究所 | Highly reliable close coupling directional coupler based on RF coaxial structure |
| CN108808202B (en) * | 2018-07-24 | 2023-08-11 | 西南应用磁学研究所 | High-reliability strong-coupling directional coupler based on radio frequency coaxial structure |
| CN110780112A (en) * | 2019-10-25 | 2020-02-11 | 武汉滨湖电子有限责任公司 | High flatness power detection device |
| CN110780112B (en) * | 2019-10-25 | 2022-06-28 | 武汉滨湖电子有限责任公司 | High flatness power detection device |
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