CN201796003U - Standing wave detection device - Google Patents
Standing wave detection device Download PDFInfo
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- CN201796003U CN201796003U CN2010202959509U CN201020295950U CN201796003U CN 201796003 U CN201796003 U CN 201796003U CN 2010202959509 U CN2010202959509 U CN 2010202959509U CN 201020295950 U CN201020295950 U CN 201020295950U CN 201796003 U CN201796003 U CN 201796003U
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Abstract
The utility model discloses a standing wave detection device, which can latch logic signals indicating whether the state of an antenna is normal or not through a latch in real time, so as to enable a processor to acquire the logic signals from the latch at any time without maintaining time synchronization at the expense of large numbers of processor resources. The standing wave detection device in the utility model can also utilize an attenuator, or a forward coupler and a reverse coupler which have different coupling factors, or a subtracter to compensate for errors caused by insertion loss of RF cables, and can utilize the subtracter to modify errors caused by each component, thereby realizing error compensation of standing wave detection. Besides, for co-siting networking of a plurality of APs (Access Point) in a WLAN (Wireless Local Area Network) system, the standing wave detection device in the utility model can detect whether the installation of a filter in each signal path is correct or not.
Description
Technical field
The utility model relates to detection technique, particularly can realize the standing wave detecting device of error compensation.
Background technology
In the prior art, need the antenna standing wave in the wireless communication systems such as test example such as WLAN usually, to determine the state of antenna.Yet,, because its transmission time slot and on-fixed, thereby if need to detect in real time antenna condition, just need expend a large amount of processor resources and guarantee that the launch time of detection time of processor and signal is synchronous for wlan system.
And, in the existing various devices that detect the antenna standing wave, do not consider that usually the radio frequency cable inserts the influence to testing result of each components and parts caused in error that loss caused and the device error yet.
The utility model content
In view of this, the utility model provides a kind of standing wave detecting device, can save standing wave and detect required processor resource, also can further realize the error compensation that standing wave detects.
A kind of standing wave detecting device that the utility model provides comprises:
The microwave signal coupling that first coupling mechanism, its utilization are emitted to radio frequency cable antenna port obtains incoming signal;
The microwave signal coupling that second coupling mechanism, its utilization are emitted to radio frequency cable antenna port obtains reflected signal;
First detector, it is converted to first voltage signal and output with incoming signal;
Second detector, it is converted to second voltage signal and output with reflected signal;
First subtracter, it obtains the difference and the output of the output of the output of first detector and second detector;
First comparer, its output and predetermined reference voltage value with first subtracter compares, and produces the expression normal logical signal of antenna that antenna port connected during greater than reference voltage level, produces the unusual logical signal of antenna of representing that antenna port connected during smaller or equal to reference voltage level in this output in this output;
First latch, it latchs the logical signal of the current generation of first comparer in real time;
First processor, its logical signal according to first latches judges whether antenna condition is normal.
The microwave signal that is emitted to radio frequency cable antenna port is from the access point AP in the wlan system, and standing wave detecting device further comprises: first delay circuit, obtain the trigger pip of first latch behind its emission enable signal delay predetermined time, latch to avoid first latch to carry out in the rising edge position of logical signal with AP.
Standing wave detecting device further comprises:
Be connected in series with first attenuator between first coupling mechanism and the first detector, be passed to first detector after its incoming signal that first coupling mechanism is obtained is decayed;
Be connected in series with second attenuator between second coupling mechanism and the second detector, be passed to second detector after its reflected signal that second coupling mechanism is obtained is decayed;
Wherein, when antenna port connected the total reflection load, incoming signal was identical with the intensity of reflected signal after the decay of second attenuator through the intensity after the decay of first attenuator.
When antenna port connected the total reflection load, the incoming signal intensity that first coupling mechanism obtains was identical with the reflected signal strength that second coupling mechanism obtains.
Standing wave detecting device further comprises: be connected in series with second subtracter between first subtracter and first comparer, this second subtracter obtains the output of first subtracter with the also output of the difference of adjusting the input voltage signal that obtains in advance, so that the output of first subtracter is proofreaied and correct.
First coupling mechanism and second coupling mechanism are connected in series with between the direct-connected AP and antenna port, and described antenna condition comprises the standing wave situation of antenna;
Perhaps, first coupling mechanism and second coupling mechanism are connected in series with between the arbitrary AP and a channel model of common location networking, this channel model and antenna port are direct-connected, and described antenna condition comprises the standing wave situation of antenna and/or the match condition of this channel model and this AP respective channels.
As seen from the above technical solution, whether normal standing wave detecting device in the utility model utilize a latch to latch expression antenna condition logical signal in real time, thereby make processor can be at any time obtain this logical signal and need not to expend a large amount of processor resources again and come the retention time synchronous from latch.
Further, the standing wave detecting device in the utility model can also utilize attenuator or utilize the different forward of the degree of coupling and reverse coupler or utilize subtracter to compensate the radio frequency cable and insert the error that loss caused;
Again further, the standing wave detecting device in the utility model can also utilize subtracter to revise the error that each components and parts causes, thereby the standing wave in the utility model detects the error compensation that can also realize further that standing wave detects.
In addition, for the situation of the common location networking of a plurality of AP in the wlan system, whether the standing wave detecting device in the utility model can also check the installation of each path channels wave filter correct.
Description of drawings
Fig. 1 is the structural representation of the standing wave detecting device among the utility model embodiment one;
Fig. 2 is the structural representation of the standing wave detecting device among the utility model embodiment two;
Fig. 3 is the structural representation of the standing wave detecting device among the utility model embodiment three;
Fig. 4 a is for using a kind of networking synoptic diagram of the wlan system of standing wave detecting device in the utility model;
Fig. 4 b is the another kind of networking synoptic diagram of the wlan system of application the utility model standing wave detecting device.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.
Following three embodiment in the utility model all utilize latch to latch the antenna condition that can supply processor to obtain, and make processor need not to expend its a large amount of resource and come the retention time can judge synchronously whether antenna condition is normal.
In addition, following three embodiment of the utility model are all with transmitting terminal access point (the Access Point in the wlan system, AP) antenna (Antenna, ANT) be example, and utilize attenuator or utilize the different forward of the degree of coupling and reverse coupler or utilize a subtracter, the diverse location in device compensates the radio frequency cable and inserts the error that loss caused; Further, no matter adopt which kind of mode to compensate and insert the error that loss caused, all can utilize subtracter to proofread and correct the error that each components and parts produces testing result.
Embodiment one
Utilize latch to avoid processor in the present embodiment in order to realize expending synchronously its a large amount of resource; And, utilize attenuator to compensate the radio frequency cable and insert the error that loss caused, alternatively, also utilize a subtracter to proofread and correct each components and parts error.
Fig. 1 is the structural representation of the standing wave detecting device among the utility model embodiment one.As shown in Figure 1, the standing wave detecting device in the present embodiment comprises at least: forward coupler 110, reverse coupler 120, attenuator 131, attenuator 132, wave detector 141, wave detector 142, subtracter 150, comparer 160, processor 170 and latch 180.
Because the principle of work of forward coupler 110 and reverse coupler 120 all belongs to prior art, so this paper is no longer given unnecessary details.
Wherein, the incoming signal that forward coupler 110 is coupled is different with the transmission path of the reflected signal that reverse coupler 120 is coupled, promptly, incoming signal directly is coupled by forward coupler 110, reflected signal is then successively via forward coupler 110, radio frequency cable between forward coupler 110 and the reverse coupler 120, reverse coupler 120, radio frequency cable between reverse coupler 120 and the antenna port arrives antenna, again through antenna-reflected after the radio frequency cable between reverse coupler 120 and the antenna port transfers to reverse coupler 120, so, because the transmission path of incoming signal and reflected signal is different, thereby incoming signal and reflected signal to be subjected to the influence of the insertion loss that the radio frequency cable exists also just different, thereby, the insertion loss that the radio frequency cable exists will cause the reference point of incoming signal and reflected signal different, and then the error that causes standing wave to detect.
For this reason, if only rely on attenuator 131 and attenuator 132 to compensate because the detection error that the insertion loss that the radio frequency cable exists is caused, it is different with the dough softening of attenuator 132 that attenuator 131 then can be set, thereby can connect under the situation of total reflection load at antenna port, make incoming signal identical with the intensity of reflected signal after attenuator 132 decay through the intensity after attenuator 131 decay, like this, can eliminate the signal intensity error that incoming signal and reflected signal cause owing to the path is different.Those skilled in the art can be at actual application environment, and be provided with reference to existing mode, and this paper repeats no more.
Because the principle of work of wave detector 141 and wave detector 142 belongs to prior art, so no longer given unnecessary details herein.
Subtracter 150, it has two input ends and an output terminal, the output terminal of a positive input terminal tie geophone 141 wherein, the output terminal of another negative input end tie geophone 142, thus obtain first voltage signal of wave detector 141 output and second voltage signal of wave detector 142 outputs difference, and export by one road output terminal.Wherein, this difference promptly can be used to represent antenna voltage standing wave ratio (VSWR) (VoltageStanding Wave Ratio, VSWR); In the practical application, may there be its peripheral circuit in subtracter 150, and as for the peripheral circuit of subtracter 150, those skilled in the art can realize that arbitrarily this paper repeats no more at actual needs and according to existing mode.
Comparer 160, it has two input ends and an output terminal, a positive input terminal wherein connects the output terminal of subtracter 150, another negative input end receives the reference voltage level of an expression thresholding VSWR, thereby first voltage signal of subtracter 150 output is compared with difference and the reference voltage level of second voltage signal, and this difference during greater than reference voltage level generation represent the normal logical signal of antenna (for example high level) that antenna port connected, produce the expression unusual logical signal (for example low level) of antenna that antenna port connected during smaller or equal to reference voltage level in this difference.Wherein, reference voltage level can be determined according to the slope and the thresholding standing wave value of wave detector 141 and wave detector 142, for example, suppose that the slope of wave detector 141 and wave detector 142 is 50mV/dB, thresholding standing wave value is 8dB, and then reference voltage level can be set at 50mV/dB * 8dB=400mV.
Latch 180, is that logical signal can real-time update at the logical signal of its real-time latched comparator 160 current generations, obtains at any time for processor 170.Further, because the logical signal that latch 180 need latch must be to produce after AP launched microwave signal, therefore, can make the trigger pip that is used to trigger latch 180 slightly be later than the time of AP launched microwave signal, correspondingly, may further include a delay circuit 181 in the present embodiment, obtain the trigger pip of latch 180 behind its emission enable signal delay predetermined time with AP, the length of this schedule time can avoid latch 180 to latch in the execution of the rising edge position of logical signal.
As above as seen, present embodiment utilizes latch 180 to latch the antenna condition that can supply processor 170 to obtain, and comes the retention time can judge synchronously whether antenna condition is normal thereby can make processor 170 need not to expend its a large amount of resource; Present embodiment also utilizes attenuator 131 and attenuator 132 to compensate the radio frequency cable and inserts the error that loss caused, thereby can realize the error compensation that standing wave detects.
Certainly, though the error that the insertion loss that utilizes attenuator 131 and attenuator 132 can compensate the radio frequency cable is caused, but, can utilize the output of the 190 pairs of subtracters 150 of subtracter shown in Fig. 1 to be proofreaied and correct for the accuracy that can further guarantee to compensate this error, and the further detection error that each components and parts caused in the compensation present embodiment standing wave detecting device.
Subtracter 190, it has two input ends and an output terminal, one of them positive input terminal connects the output terminal of subtracter 150, another negative input end receives adjusts the input voltage signal that obtains in advance, an output terminal connects the positive input terminal of comparer 160, and promptly the positive input terminal of comparer 160 connects the output terminal of subtracter 150 by subtracter 190.
Wherein, above-mentioned input voltage signal can be adjusted in advance in the following manner and obtain: connect the total reflection load, incoming signal is all reflected at antenna port, at this moment, the size of the incoming signal that forward coupler 110 is produced and the reflected signal that reverse coupler 120 is produced in theory should be identical, i.e. the output of subtracter 150 should be 0.But in the practical application, because forward coupler 110, reverse coupler 120, attenuator 131 and 132, wave detector 141 and 142 errors that may exist, and the aforementioned error that may cause by the radio frequency cable, the actual output that may cause subtracter 150 is not 0, thereby when antenna port connects the total reflection load, regulate input voltage signal to a fixed value of continuous variable, promptly with the subtracter 150 actual values that equate of exporting, make subtracter 190 be output as 0, thereby, connect antenna at follow-up antenna port, when the moving standing wave of going forward side by side detects, will be eliminated by subtracter 190 by the part that above-mentioned error caused in subtracter 150 outputs.
In addition, if when design, exist some factor will inevitably make when antenna port connects the total reflection load, subtracter 150 theoretic outputs deviate from 0, then in input voltage when letter of regulating continuous variable in the manner described above, this input voltage signal also should be adjusted to this and deviate from 0 fixed value.
In the practical application, subtracter 150 in the present embodiment and subtracter 190 all can utilize operational amplifier and some resistance to make up and form, and how to make up subtracter and belong to prior art, and this paper is no longer given unnecessary details.
Embodiment two
Utilize latch to avoid processor in the present embodiment in order to realize expending synchronously its a large amount of resource; And, utilize different forward of the degree of coupling and reverse coupler to compensate the radio frequency cable and insert the error that loss caused, alternatively, also utilize a subtracter to proofread and correct each components and parts error.
Fig. 2 is the structural representation of the standing wave detecting device among the utility model embodiment two.As shown in Figure 2, the standing wave detecting device in the present embodiment comprises: forward coupler 210, reverse coupler 220, wave detector 241, wave detector 242, subtracter 250, comparer 260, processor 270.
Wherein, the incoming signal that forward coupler 210 is coupled is different with the transmission path of the reflected signal that reverse coupler 220 is coupled, promptly, incoming signal directly is coupled by forward coupler 210, reflected signal is then successively via forward coupler 210, radio frequency cable between forward coupler 210 and the reverse coupler 220, reverse coupler 220, radio frequency cable between reverse coupler 220 and the antenna port arrives antenna, again through antenna-reflected after the radio frequency cable between reverse coupler 220 and the antenna port transfers to reverse coupler 220, so, because the transmission path of incoming signal and reflected signal is different, thereby incoming signal and reflected signal to be subjected to the influence of the insertion loss that the radio frequency cable exists also just different, thereby, the insertion loss that the radio frequency cable exists will cause the reference point of incoming signal and reflected signal different, and then the error that causes standing wave to detect.
For this reason, the degree of coupling that forward coupler 210 and reverse coupler 220 can be set in the present embodiment is different, with compensation because the detection error that the insertion losses that the radio frequency cable exists are caused, promptly, connect at antenna port under the situation of total reflection load, the incoming signal intensity that forward coupler 210 is obtained is identical with the reflected signal strength that reverse coupler 220 obtains.As for how to calculate the degree of coupling value that can remedy above-mentioned error and whether need for example other parameters such as isolation of corresponding adjustment, those skilled in the art can realize that this paper is no longer given unnecessary details arbitrarily according to existing directional coupler principle.
As above as seen, present embodiment utilizes latch 280 to latch the antenna condition that can supply processor 270 to obtain, and comes the retention time can judge synchronously whether antenna condition is normal thereby can make processor 270 need not to expend its a large amount of resource; Present embodiment also utilizes the degree of coupling different forward coupler 210 and reverse coupler 220 to compensate the radio frequency cable and inserts the error that loss caused, thereby can realize the error compensation that standing wave detects.
Certainly, though the error that the insertion loss that utilizes the degree of coupling different forward coupler 210 and reverse coupler 220 can compensate the radio frequency cable is caused, but, can utilize the output of the 290 pairs of subtracters 250 of subtracter shown in Fig. 2 to be proofreaied and correct for the accuracy that can further guarantee to compensate this error, and the further detection error that each components and parts caused in the compensation present embodiment standing wave detecting device.
Wherein, above-mentioned input voltage signal can be adjusted in advance in the following manner and obtain: connect the total reflection load, incoming signal is all reflected at antenna port, at this moment, the size of the incoming signal that forward coupler 210 is produced and the reflected signal that reverse coupler 220 is produced in theory should be identical, i.e. the output of subtracter 250 should be 0.But in the practical application, because forward coupler 210, reverse coupler 220, wave detector 241 and 242 errors that may exist, and the aforementioned error that may cause by the radio frequency cable, the actual output that may cause subtracter 250 is not 0, thereby when antenna port connects the total reflection load, regulate input voltage signal to a fixed value of continuous variable, promptly with the subtracter 250 actual values that equate of exporting, make subtracter 290 be output as 0, thereby, connect antenna at follow-up antenna port, when the moving standing wave of going forward side by side detects, will be eliminated by subtracter 290 by the part that above-mentioned error caused in subtracter 250 outputs.
In addition, if when design, exist some factor will inevitably make when antenna port connects the total reflection load, subtracter 250 theoretic outputs deviate from 0, then in input voltage when letter of regulating continuous variable in the manner described above, this input voltage signal also should be adjusted to this and deviate from 0 fixed value.
In the practical application, subtracter 250 in the present embodiment and subtracter 290 all can utilize operational amplifier and some resistance to make up and form, and how to make up subtracter and belong to prior art, and this paper is no longer given unnecessary details.
Embodiment three
Utilize latch to avoid processor in the present embodiment in order to realize expending synchronously its a large amount of resource; And, utilize a subtracter to compensate the radio frequency cable and insert the error that loss caused, alternatively, also utilize this subtracter to revise each components and parts error.
Fig. 3 is the structural representation of the standing wave detecting device among the utility model embodiment three.As shown in Figure 3, the standing wave detecting device in the present embodiment comprises: forward coupler 310, reverse coupler 320, wave detector 341, wave detector 342, subtracter 350, subtracter 390, comparer 360, processor 370.
Forward coupler 310, its input end 311 and output terminal 312 orders are connected in series with radio frequency cable, its isolation end 313 near output terminal 312 1 sides of inserting between AP and the antenna port can produce incoming signal by for example resistance R 315 ground connection, its coupled end 314 near input end 311 1 sides of 50 ohm, thereby the microwave signal coupling that the forward coupler 310 that is connected in series with the radio frequency cable can utilize AP to be emitted to the antenna port of radio frequency cable obtains incoming signal;
Reverse coupler 320, radio frequency cable, its isolation end 323 near input end 321 1 sides that its input end 321 and output terminal 322 orders are connected in series with between AP and the antenna port can produce reflected signal by for example resistance R 325 ground connection, its coupled end 324 near output terminal 322 1 sides of 50 ohm, thereby the reverse coupler 120 that is connected in series with the radio frequency cable can utilize the microwave signal coupling that is emitted to radio frequency cable antenna port to obtain reflected signal.
Wave detector 341, its input end connect the coupled end 314 that forward coupler 310 produces incoming signals, and the incoming signal that forward coupler 310 produces is converted to behind the 5th voltage signal from its output terminal output;
Wave detector 342, its input end connect the coupled end 324 that reverse coupler 320 produces reflected signals, and the reflected signal that reverse coupler 320 produces is converted to behind the 6th voltage signal from its output terminal output.
Subtracter 350, it has two input ends and an output terminal, the output terminal of a positive input terminal tie geophone 341 wherein, the output terminal of another negative input end tie geophone 342, thus obtain the 5th voltage signal of wave detector 341 output and the 6th voltage signal of wave detector 342 outputs difference, and export by one road output terminal.Wherein, this difference promptly can be used to represent the VSWR of antenna; In the practical application, may there be its peripheral circuit in subtracter 350, and as for the peripheral circuit of subtracter 150, those skilled in the art can realize that arbitrarily this paper repeats no more at actual needs and according to existing mode.
Subtracter 390, it has two input ends and an output terminal, one of them positive input terminal connects the output terminal of subtracter 350, another negative input end receives adjusts the input voltage signal that obtains in advance, subtracter 390 subtracts each other the output of subtracter 350 and the input voltage signal that adjustment in advance obtains, realization is to the correction of the difference of the 5th voltage signal of subtracter 350 output and the 6th voltage signal, with eliminate incoming signal with reflected signal because the different errors that caused in path, then by the 5th voltage signal behind the one output terminal output calibration and the difference of the 6th voltage signal.
Above-mentioned input voltage signal can be adjusted in advance in the following manner and obtain: connect the total reflection load, incoming signal is all reflected at antenna port, at this moment, the size of the incoming signal that forward coupler 310 is produced and the reflected signal that reverse coupler 320 is produced in theory should be identical, i.e. the output of subtracter 350 should be 0;
But in the practical application, because forward coupler 310, reverse coupler 320, wave detector 241 and 242 errors that may exist, and insert the error that loss causes by the radio frequency cable, the actual output that may cause subtracter 350 is not 0, thereby when antenna port connects the total reflection load, regulate input voltage signal to a fixed value of continuous variable, promptly with the subtracter 350 actual values that equate of exporting, make subtracter 390 be output as 0, thereby, connect antenna at follow-up antenna port, when the moving standing wave of going forward side by side detects, will be eliminated by subtracter 390 by the part that above-mentioned error caused in subtracter 350 outputs;
In addition, if when design, exist some factor will inevitably make when antenna port connects the total reflection load, subtracter 350 theoretic outputs deviate from 0, then in input voltage when letter of regulating continuous variable in the manner described above, this input voltage signal also should be adjusted to this and deviate from 0 fixed value.
In the practical application, subtracter 350 in the present embodiment and subtracter 390 all can utilize operational amplifier and some resistance to make up and form, and how to make up subtracter and belong to prior art, and this paper is no longer given unnecessary details.
Comparer 360, it has two input ends and an output terminal, a positive input terminal wherein connects the output terminal of subtracter 390, another negative input end receives the reference voltage level of an expression thresholding VSWR, thereby the 5th voltage signal of having proofreaied and correct of subtracter 390 output is compared with difference and the reference voltage level of the 6th voltage signal, and this difference during greater than reference voltage level generation represent the normal logical signal of antenna (for example high level) that antenna port connected, produce the expression unusual logical signal (for example low level) of antenna that antenna port connected during smaller or equal to reference voltage level in this difference.Wherein, the setting of the reference voltage level in the present embodiment belong to prior art, promptly with embodiment one in like manner, no longer given unnecessary details herein.
Latch 380, is that logical signal can real-time update at the logical signal of its real-time latched comparator 360 current generations, obtains at any time for processor 370.Further, may further include a delay circuit 381 in the present embodiment, obtain the trigger pip of latch 380 behind its emission enable signal delay predetermined time with AP, the length of this schedule time can avoid latch 380 to latch in the execution of the rising edge position of logical signal.
Processor 370, it judges according to aforesaid logical signal whether antenna condition is normal.In the practical application, processor 370 can judge whether antenna condition is normal according to the logical signal that single obtains; Perhaps, also the logical signal that can further obtain according to continuous several times judges whether antenna condition is normal, for example processor 370 can be according in the logical signal that obtains continuously, represent normal logical signal quantity of antenna and the ratio of representing the logical signal quantity that antenna is unusual, and judge according to this ratio whether antenna condition is normal.
As above as seen, present embodiment utilizes latch 380 to latch the antenna condition that can supply processor 370 to obtain, and comes the retention time can judge synchronously whether antenna condition is normal thereby can make processor 370 need not to expend its a large amount of resource; Present embodiment also utilizes subtracter 390 to compensate the radio frequency cable insertion error that loss caused and each the components and parts error in the present embodiment standing wave detecting device, thereby can realize the error compensation that standing wave detects.
Above-mentioned three embodiment all are to be example to be applied in wlan system, and for two kinds of networking modes among the WLAN, above-mentioned three embodiment all can be suitable for.
Fig. 4 a is for using a kind of networking synoptic diagram of the wlan system of standing wave detecting device in the utility model.Shown in Fig. 4 a, AP and antenna port in the wlan system are direct-connected, standing wave detecting device in the utility model can be connected in series with between the direct-connected AP and antenna port, that is, the input end of forward coupler 110/210/310 and reverse coupler 120/220/320 and output terminal are connected in series with between the direct-connected AP and antenna port in proper order.In this case, the antenna condition judged of processor 170/270/370 only comprises the standing wave situation of antenna usually.
Fig. 4 b is the another kind of networking synoptic diagram of the wlan system of application the utility model standing wave detecting device.As shown in Figure 4, adopt a plurality of AP location network's mode altogether in the wlan system, so, between each road AP and antenna, all order is connected with the standing wave detecting device in the utility model and the channel model of this road respective channels, that is, the input end of forward coupler 110/210/310 and reverse coupler 120/220/320 and output terminal are connected in series with between the channel model of this road AP and this AP respective channels and the channel model of this AP respective channels is direct-connected with the antenna port on this road in proper order.
Thereby, because the very poor even full emission of standing wave on the frequency range outside better, the logical frequency range of the standing wave in the passband of channel model, thereby can judge whether channel model is correct by the mode of judging standing wave, promptly, the logical signal that processor 170/270/370 can further detect according to standing wave judges whether the channel model of its connection is the channel model of the AP institute respective channels of its connection.For example, what networking was used is 1,6,13 these three channels of WLAN, channel model for 6 channels, standing wave on 6 channels is fine and standing waves on 1,13 channels are very poor, if work in channel filtering the linking to each other of AP with 6 channels of 1 channel or 13 channels by mistake, will cause the very poor situation of standing wave, standing wave detecting device can further send standing wave alarm, in order to the setup error of prompting channel model.
That is to say that for the situation of the common location networking of AP, the antenna condition that processor 170/270/370 is judged can comprise the standing wave situation of antenna and/or the match condition of this channel model and this AP respective channels usually.
The above is preferred embodiment of the present utility model only, is not to be used to limit protection domain of the present utility model.All within spirit of the present utility model and principle, any modification of being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (6)
1. a standing wave detecting device is characterized in that, comprising:
The microwave signal coupling that first coupling mechanism, its utilization are emitted to radio frequency cable antenna port obtains incoming signal;
The microwave signal coupling that second coupling mechanism, its utilization are emitted to radio frequency cable antenna port obtains reflected signal;
First detector, it is converted to first voltage signal and output with incoming signal;
Second detector, it is converted to second voltage signal and output with reflected signal;
First subtracter, it obtains the difference and the output of the output of the output of first detector and second detector;
First comparer, its output and predetermined reference voltage value with first subtracter compares, and produces the expression normal logical signal of antenna that antenna port connected during greater than reference voltage level, produces the unusual logical signal of antenna of representing that antenna port connected during smaller or equal to reference voltage level in this output in this output;
First latch, it latchs the logical signal of the current generation of first comparer in real time;
First processor, its logical signal according to first latches judges whether antenna condition is normal.
2. standing wave detecting device as claimed in claim 1, it is characterized in that, the microwave signal that is emitted to radio frequency cable antenna port is from the access point AP in the wlan system, and standing wave detecting device further comprises: first delay circuit, obtain the trigger pip of first latch behind its emission enable signal delay predetermined time, latch to avoid first latch to carry out in the rising edge position of logical signal with AP.
3. standing wave detecting device as claimed in claim 1 is characterized in that standing wave detecting device further comprises:
Be connected in series with first attenuator between first coupling mechanism and the first detector, be passed to first detector after its incoming signal that first coupling mechanism is obtained is decayed;
Be connected in series with second attenuator between second coupling mechanism and the second detector, be passed to second detector after its reflected signal that second coupling mechanism is obtained is decayed;
Wherein, when antenna port connected the total reflection load, incoming signal was identical with the intensity of reflected signal after the decay of second attenuator through the intensity after the decay of first attenuator.
4. standing wave detecting device as claimed in claim 1 is characterized in that, when antenna port connected the total reflection load, the incoming signal intensity that first coupling mechanism obtains was identical with the reflected signal strength that second coupling mechanism obtains.
5. as claim 1 or 3 or 4 described standing wave detecting devices, it is characterized in that, standing wave detecting device further comprises: be connected in series with second subtracter between first subtracter and first comparer, this second subtracter obtains the output of first subtracter with the also output of the difference of adjusting the input voltage signal that obtains in advance, so that the output of first subtracter is proofreaied and correct.
6. standing wave detecting device as claimed in claim 1 is characterized in that,
First coupling mechanism and second coupling mechanism are connected in series with between the direct-connected AP and antenna port, and described antenna condition comprises the standing wave situation of antenna;
Perhaps, first coupling mechanism and second coupling mechanism are connected in series with between the arbitrary AP and a channel model of common location networking, this channel model and antenna port are direct-connected, and described antenna condition comprises the standing wave situation of antenna and/or the match condition of this channel model and this AP respective channels.
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| CN111044797A (en) * | 2019-12-31 | 2020-04-21 | 东南大学 | MEMS integrated microwave standing wave meter capable of tuning frequency state and preparation method thereof |
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2010
- 2010-08-17 CN CN2010202959509U patent/CN201796003U/en not_active Expired - Lifetime
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| CN111044797A (en) * | 2019-12-31 | 2020-04-21 | 东南大学 | MEMS integrated microwave standing wave meter capable of tuning frequency state and preparation method thereof |
| CN111044797B (en) * | 2019-12-31 | 2021-11-12 | 东南大学 | MEMS integrated microwave standing wave meter capable of tuning frequency state and preparation method thereof |
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