CN203537378U - An L wave band RF system output port protective device - Google Patents
An L wave band RF system output port protective device Download PDFInfo
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- CN203537378U CN203537378U CN201320658921.8U CN201320658921U CN203537378U CN 203537378 U CN203537378 U CN 203537378U CN 201320658921 U CN201320658921 U CN 201320658921U CN 203537378 U CN203537378 U CN 203537378U
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Abstract
The utility model relates to an L wave band RF system output port protective device comprising an L wave band RF system output port protective circuit arranged inside a metal enclosed cavity. The circuit comprises a coupler, a detection comparison circuit and a numerical control feedback circuit. The detection comparison circuit comprises a forward direction detection circuit, a reverse direction detection circuit, a tuning circuit and a comparator. The numeral control feedback circuit comprises a data processing circuit, a VSWR indication circuit and a protection determination circuit. After the device is connected with an RF system final amplifier, the coupler is utilized to separate L wave band incident waves from reflection waves according to a proportion; then through the detection comparison circuit, a reflection amount and an incident amount which are separated are compared to output a logic level; the logic level is connected with the numerical control feedback circuit; port coupling conditions are determined through data processing, so that when ports are not coupled, the protective circuit can timely switch off corresponding transmission signals so as to realize a protective function; the whole device is characterized by being small and portable, being sensitive in indication and determination, etc.
Description
Technical field
The utility model relates to communication technical field, particularly a kind of L section RF system output port protection equipment.Equipment is for realizing to the sampling rate of the forward wave of RF system output port RF signal and backward-wave; pass through comparative result; the return loss value of judgement RF system output port; according to equipment in advance tuning return loss value be reference; when if return loss is excessive; equipment can be made conservation treatment to RF system in time, has guaranteed the safe handling of RF system.
Background technology
The modern develop rapidly of accompanying information, the communication technology and our life contact more and more closer, the development of the modern industry, business, military affairs, the research and development of communication speciality theory, makes communications industry have develop rapidly.In the RF system of the communications field, during amplifier mismatch, can affect its operating state, and likely in system, introduce clutter interference, if mismatch is serious, particularly during the final amplifier mismatch of system, even device be may burn, system failure, operational failure caused.Therefore, taking appropriate measures, carry out the output port protection of RF system, is necessary in actual applications.The protection of RF system output port, is the problem that must consider in whole system design process, and in most of system, all has port match problem.The quality of port match, directly affects systematic function, and whether the system that even determined is working properly.
Summary of the invention
The purpose of this utility model is for mismatch problem between ubiquitous device in current RF system, especially solves RF system output port when mismatch is serious, may burn device, causes system failure, the problem of operational failure.The phenomenon why device is burnt in existence, because RF system final amplifier output signal power is very high, if circuit mismatch is serious, reflection coefficient of port loss is excessively poor, the volume reflection that transmits is too high, higher energy is not only launched, is passed as the carrier of information, and the system that is reflected back on the contrary causes the work of final amplifier overload, so that burns.Therefore,, for this phenomenon, the protection of RF system output port is necessary.The utility model is by the return loss value of the protected system output port of Real-Time Monitoring; compare with predefined expectation protection value, if when monitor value is greater than expectation protection value, RF system is made to conservation treatment; when measured value to be checked returns to normal value, in RF system, resume work.
The utility model to achieve these goals, the technical scheme of taking is: a kind of L-band RF system output port protection equipment, it is characterized in that: comprise the L-band RF system output port protective circuit being arranged in metal enclosed cavity, described L-band RF system output port protective circuit comprises coupler, detection comparison circuit, numerical control feedback circuit, described coupler is bidirectional coupler, described detection comparison circuit comprises forward detecting circuit, reverse detecting circuit, tuning circuit and comparator, described data feedback circuit comprises data processing circuit, VSWR indicating circuit and protection decision circuitry, described coupler is connected with forward detecting circuit and the reverse detecting circuit of detection comparison circuit respectively, described forward detecting circuit is connected with comparator by tuning circuit, described reverse detecting circuit is connected with comparator, described comparator is connected with the data processing circuit of numerical control feedback circuit, and data processing circuit is connected with protection decision circuitry with VSWR indicating circuit respectively, its processing of circuit process is:
A) RF system final stage output, is generally final amplifier output, directly enters coupler and by coupler, the forward power of radiofrequency signal and backward power is coupled out in proportion;
B) forward coupling respectively enters forward detecting circuit and reverse detecting circuit with the signal power being coupled out in the other direction, aligns reverse signal and carries out detection, exports comparatively mild voltage signal;
C) voltage signal of forward detection, after accurate adjustable resistor dividing potential drop in tuning circuit with together with the voltage signal of reverse detecting circuit, enter into respectively comparator oppositely and positive input;
Whether d) comparison signal of comparator output enters numerical control feedback circuit, met and set requirement, simultaneously the transmitting path of comparative structure feedback by numerical control treatment circuit indication port VSWR value, if port VSWR is too high, to close the transmitting of RF system signal, avoid causing device failure, equipment fault.
Coupler is selected the bidirectional coupler of mini company, according to RF system real work frequency range, selects the coupler of corresponding frequency band.In the design, select L-band.
L-band RF system output port protection equipment external form adopts cavity metal structure, and the mounting circuit printed board of inner institute does not add welding resistance while making processes, and the floor file of printed board Bottom layer large area, is used screw fastening in structural lumen bottom during installation, guarantees abundant ground connection.For guaranteeing that return loss detects accurately, forward detecting circuit and oppositely detecting circuit should have identical circuit parameter; Tuning circuit should be according to RF system practical situations, according to the return loss value of expection, carry out tuning, tuning after, should use silica gel solid determine tuning knob at tuning place, in order to avoid factor change pre-set points such as vibrations.
The beneficial effects of the utility model are, Real-Time Monitoring prevention at radio-frequency port return loss value, and calculate by data, judged result is fed back to RF system, to reach the Real-Time Monitoring protection to RF system port.Meanwhile, can adjust tuning circuit knob according to the needs of practical application, change the return loss value that action is protected in expection, to reach optimum protection effect.Thereby avoided not mating or terminal open circuit causes reflection coefficient of port loss suddenly to become greatly because of RF system device, burnt device, the phenomenon of systemic breakdown occurs.Can effectively guarantee the reliability of RF system works.And this equipment has the advantages that insertion loss is little, equipment access, after RF system, can not impacted RF system power output.The features such as whole equipment has small and exquisite, light, and indication judgement is sensitive.And equipment insertion loss is less than 0.5dB, guarantee can not impact original system operating state and transmitting power after access device.
Accompanying drawing explanation
Fig. 1 is that circuit of the present utility model connects block diagram;
Fig. 2 is port protection equipment access position view of the present utility model;
Fig. 3 is coupler theory diagram of the present utility model;
Fig. 4 is equipment contour structures floor map of the present utility model.
In figure: 1. coupler; 2. detection comparison circuit; 3. numerical control feedback circuit; 21. forward detecting circuits; 22. reverse detecting circuits; 23. tuning circuits; 24. comparators; 31. data processing circuits; 32.VSWR indicating circuit; 33. protection decision circuitry; 41. input ports; 42 output ports; 43 feedback signal outputs, 44 equipment power supply inputs.
Embodiment:
Below in conjunction with accompanying drawing, native system is described further.
As shown in Figure 1, for circuit of the present utility model connects block diagram.A kind of L-band RF system output port protection equipment; comprise the L-band RF system output port protective circuit being arranged in metal enclosed cavity 4; L-band RF system output port protective circuit comprises coupler 1, detection comparison circuit 2, numerical control feedback circuit 3, thereby realizes the port protection function of RF system.Coupler 1 is bidirectional coupler, and detection comparison circuit 2 comprises forward detecting circuit 21, reverse detecting circuit 22, tuning circuit 23 and comparator 24, and data feedback circuit 3 comprises data processing circuit 31, VSWR indicating circuit 32 and protection decision circuitry 33; Coupler 1 is connected with forward detecting circuit 21 and the reverse detecting circuit 22 of detection comparison circuit 2 respectively; forward detecting circuit 21 is connected with comparator 24 by tuning circuit 23; oppositely detecting circuit 22 is connected with comparator 24; comparator 24 is connected with the data processing circuit 31 of numerical control feedback circuit 3, and data processing circuit 31 is connected with protection decision circuitry 33 with VSWR indicating circuit 32 respectively.
Radiofrequency signal is exported by the final amplifier of RF system, enters to coupler 1 part of equipment.Signal is through coupler 1, and most of signal is directly exported by coupler 1 main road, signal normal transmission path.And sub-fraction signal power wherein, being coupled device 1 is coupled out in proportion, respectively by forward direction coupled end (FORWARD port) and reverse coupled end (REVERSE port) output of coupler 1, enter forward detection 21 and reverse detection 22 circuit, detecting circuit has identical detection efficiency for guaranteeing in circuit, and parameter should be identical.Under system matches, reference performance, reflection coefficient of port loss is in normal range (NR), and forward direction coupling amount must be greater than reverse coupled amount, so forward detection output voltage is greater than reverse detection output voltage.In circuit, tuning circuit 23 is slide rheostat, enter into the magnitude of voltage that comparator 24 reverse input ends compare, and reverse detecting circuit enters the positive input of comparator 24 by adjusting its resistance, changing.Comparator output enters into data processing circuit 31 and carries out data processing, and result feeds back on the one hand protection decision circuitry 33 and judges whether the RF system return loss value value of surpassing the expectation, and needs cut-off signals passage, with protection system port security; Data processed result sends to VSWR indicating circuit 32 on the other hand, display port return loss situation directly perceived.
Particularly point out, this equipment is the protection equipment of RF system output port return loss when abnormal, should by adjusting tuning circuit 23, determine the return loss value of expecting according to the concrete applicable cases of RF system, carries out port protection action.The tuning voltage ratio α of slide rheostat % in tuning circuit, can draw according to following formula:
α% =
。
For example, if expectation RF system is greater than at 20 o'clock in reflection coefficient of port loss, protection equipment is protected RF system, while calculating the tuning voltage ratio α of known slide rheostat %=0.1 by above-mentioned formula so, can satisfy condition.If in like manner expectation RF system is greater than at 40 o'clock in reflection coefficient of port loss, protection equipment is protected RF system, the tuning voltage ratio α of slide rheostat %=0.01.
Visible, according to system requirements, determine that, after the return loss value of expectation, only, by the value of divider resistance in Circuit tuning, circuit can be realized the defencive function of expectation.Thereby the resistance of slide rheostat and clawback loss protection value are linked together, by simple adjusting, realized comparatively complicated computational process, guaranteed the reliability of L-band RF system output port protection equipment.
As shown in Figure 2, be L-band RF system output port protection equipment access position signal, when application, be directly connected in series to the final stage port of RF system.L-band RF system output port protection equipment becomes a module combination of RF system.So, the output of former RF system is the final amplifier output of RF system, is linked into the input port of equipment, and the output of equipment becomes the output port of former RF system.
As shown in Figure 3, be equipment Primary Component, directional coupler operation principle.Directional coupler is a kind of four port networks, when RF signal is inputted by INPUT port, most of from the straight-through output of OUTPUT port, wherein have sub-fraction to be coupled out by FORWARD port, and reflected signal is coupled out by REVERSE port.The directivity of directional coupler is a vital index, when especially synthetic as signal and reflection measurement is applied.Directional coupler role is the sampling of forward and reflection RF signal.So that subsequent conditioning circuit is done tuning, relatively process.
As shown in Figure 4, be equipment contour structures floor map.Each functional circuit of equipment is drawn in same printed board, for guaranteeing that signal is pure, circuit ground is good, when printed board is made, do not do silk-screen and welding resistance and process, printed board Top layer is walked track, the floor file of Bottom layer large area, adopt the mode of screw fastening, be installed on the bottom of metallic cavity, avoid introducing noise jamming.Cavity wall perforate installation code SMA radio frequency connector is as signal input output interface, and the RF signal of protected system is entered by input port 41, by output port 42, is exported.Simultaneously cavity wall is installed feedthrough capacitor and is exported 43 interfaces as power 44 interfaces and feedback signal of equipment, and feedback signal is exported 43 output protections judgement information, is connected to RF system, responds in time protection information.Cavity upper cover plate is used screw fastening equally, guarantees that circuit board is in a complete airtight space, has effectively like this shielded extraneous signal and disturbs, and makes the processing of device interior signal and data relatively stable.
1. coupler; 2. detection comparison circuit; 3. numerical control feedback circuit; 21. forward detecting circuits; 22. reverse detecting circuits; 23. tuning circuits; 24. comparators; 31. data processing circuits; 32.VSWR indicating circuit; 33. protection decision circuitry; 41. input ports; 42 output ports; 43 feedback signal outputs, 44 equipment power supply inputs.
Claims (2)
1. a L-band RF system output port is protected equipment, it is characterized in that: comprise the L-band RF system output port protective circuit being arranged in metal enclosed cavity (4), described L-band RF system output port protective circuit comprises coupler (1), detection comparison circuit (2), numerical control feedback circuit (3), described coupler (1) is bidirectional coupler, described detection comparison circuit (2) comprises forward detecting circuit (21), reverse detecting circuit (22), tuning circuit (23) and comparator (24), described numerical control feedback circuit (3) comprises data processing circuit (31), VSWR indicating circuit (32) and protection decision circuitry (33), described coupler (1) is connected with forward detecting circuit (21) and the reverse detecting circuit (22) of detection comparison circuit (2) respectively, described forward detecting circuit (21) is connected with comparator (24) by tuning circuit (23), described reverse detecting circuit (22) is connected with comparator (24), described comparator (24) is connected with the data processing circuit (31) of numerical control feedback circuit (3), and data processing circuit (31) is connected with protection decision circuitry (33) with VSWR indicating circuit (32) respectively.
2. a kind of L-band RF system output port protection equipment according to claim 1, is characterized in that: described coupler (1) is selected the bidirectional coupler of mini company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320658921.8U CN203537378U (en) | 2013-10-24 | 2013-10-24 | An L wave band RF system output port protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320658921.8U CN203537378U (en) | 2013-10-24 | 2013-10-24 | An L wave band RF system output port protective device |
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| Publication Number | Publication Date |
|---|---|
| CN203537378U true CN203537378U (en) | 2014-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320658921.8U Expired - Fee Related CN203537378U (en) | 2013-10-24 | 2013-10-24 | An L wave band RF system output port protective device |
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| CN (1) | CN203537378U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108020729A (en) * | 2017-11-29 | 2018-05-11 | 南京捷希科技有限公司 | The active standing wave test system and test method of a kind of extensive antenna |
-
2013
- 2013-10-24 CN CN201320658921.8U patent/CN203537378U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108020729A (en) * | 2017-11-29 | 2018-05-11 | 南京捷希科技有限公司 | The active standing wave test system and test method of a kind of extensive antenna |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20141024 |
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| EXPY | Termination of patent right or utility model |