CN201015128Y - Traditional mode modified type electronic article monitoring antenna system - Google Patents
Traditional mode modified type electronic article monitoring antenna system Download PDFInfo
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- CN201015128Y CN201015128Y CNU2006201625792U CN200620162579U CN201015128Y CN 201015128 Y CN201015128 Y CN 201015128Y CN U2006201625792 U CNU2006201625792 U CN U2006201625792U CN 200620162579 U CN200620162579 U CN 200620162579U CN 201015128 Y CN201015128 Y CN 201015128Y
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Abstract
The utility model discloses a traditional improved type aerial system the electronic article supervision, by which the supervision of the label fading signal is made easier and the remained influence of the pulse transmission is better removed. The technical proposal of the utility model is: the aerial system comprises a set of antenna group, which combines the sending and receiving functions, and is composed of an independent annular upper antenna and an independent annular lower antenna. The annular upper and lower antennas, which can be used for sending and receiving, are positioned at a plane. A set of magnetic rod receiving antennae is specially used for receiving. The utility model further comprises at least two magnetic rod antennae, wherein, at least a magnetic rod antenna is arranged on the upper half of the whole antenna group, and at least a magnetic rod antenna is positioned at the lower half of the whole antenna group. The utility model is applied in the electronic article supervision system.
Description
Technical field
The utility model relates to a kind of antenna system, relates in particular to a kind of antenna system that is applied in pulse emission-type sound-magnetic electronic article supervision (EAS) system.
Background technology
Pulse emission-type sound magnetic EAS system usually needs to launch one group of high-octane pulse train of high pressure as shown in Figure 1.Emission magnetic field that transmitter and receiver in the antenna system is formed and surveyed area cover certain channel distance scope, can be the transmitter and receiver separated structures shown in Fig. 2 A, also can be the structure that the transmitter and receiver shown in Fig. 2 B is integrated.
When the commodity that carry label passed through the monitored area, the resonance device of label will be activated by the emission magnetic field of impulse form, and resonance produces the label resonance signal of a same frequency.Fig. 3 A is the reception condition of label resonance signal under the perfect condition, when the pulse of EAS system transmits at each end-of-pulsing, the label resonance signal does not finish at once, but slowly weaken by a slow exponential function mode that manys than the transmitting antenna decay, and the resonance oscillation attenuation signal that a receive window is used for monitoring label is just opened by the EAS system when each transmitted pulse finishes.
See also Fig. 3 B, present actual conditions are: the high pressure macro-energy of transmitter on antenna can not decay at once, the tail of the residual decay of meeting, and the label deamplification that will receive is faint small-signal, so if the tail of not avoiding launching will all be submerged in and transmit.If but it is too far away to avoid transmitting, can make again the too many of receiving signal attenuation and monitoring less than or sensitivity descend.Therefore, the signal that how to allow transmitted pulse finish the back transmitting antenna is decayed and receive window can be opened as soon as possible and is related to systematic function as soon as possible.
Existing a kind of processing mode is the residual voltage that reaches FEEDBACK CONTROL and decay emission in the mode of current feedback, can realize that in theory ground is fine.But because the difference of practical devices can not reach best effect all the time, debugging preferably also has residual voltage but also can continue a period of time, so the delay of window is very long.
In addition, the applicant's Chinese patent application " method of the antenna system of eas and configuration " that disclosed publication number was CN1481082 on March 10th, 2004 adopts an O word antenna and one 8 word antenna, two antennas are opened a way respectively by electronic device (controllable silicon), make pulse signal turn-off to reach the disconnection antenna loop.But because imperfectization of practical devices, be not 100% open circuit, always have the existence of residual voltage and the signal of faint label resonance oscillation attenuation to compare, amplitude and energy are still enough greatly.
Above-mentioned patent application still can cause two results: (1) is if open receive window too early, although label signal does not also have the very little of decay at this moment, but the residual voltage of the energy attenuation of emission will be mixed on the label signal, and it can be flooded or greatly reduce signal to noise ratio.(2) if allow the residual voltage complete obiteration of emission, make the very little of label signal decay again, the signal strength signal intensity that can effectively receive is just very little.
Other has a kind of actual practice is to utilize two group of 8 word antenna and two groups of O word antennas respectively, and one group of 8 word O word is as transmitting antenna, and another organizes 8 word O words as induction antenna, feeds back the dump energy of emission by induction antenna, controls the shutoff of transmitting antenna.But because the interacting of two antennas, debug difficulties also can influence the operate as normal of emission.
Summary of the invention
The purpose of this utility model is to address the above problem, and a kind of antenna system of eas is provided, and makes the monitoring of label deamplification become more easy, has eliminated exomonental residual influence better.
The technical solution of the utility model is: the utility model provides the antenna system of the follow-on eas of a kind of traditional approach, it is characterized in that, described antenna system comprises:
The antenna sets part of one group of transmitting-receiving unification is made up of antenna under antenna on the independent O word annular and the independent O word annular, on this O word under antenna and this O word antenna be on the plane, these two antennas both can have been launched also and can receive;
One group of bar magnet reception antenna is used for receiving specially, further comprises:
At least two magnetic rod antennas, wherein at least one magnetic rod antenna is at the first half of entire antenna group, and at least one magnetic rod antenna is in the Lower Half of entire antenna group.
The antenna system of the above-mentioned follow-on eas of traditional approach, wherein, these two O word loop aerials can be circle or oval ring antenna, also can be squaerial.
The antenna system of the above-mentioned follow-on eas of traditional approach, wherein, the direction of magnetic rod antenna can adjust to change the directivity that signal receives.
The antenna system of the above-mentioned follow-on eas of traditional approach, wherein, those magnetic rod antennas are worked in LC resonant circuit mode, its resonance frequency equates with the label resonance frequency, the inductance of LC resonant circuit is wound on those bar magnets, the electric capacity of one tunable capacitor value is connected in parallel on this inductance, makes Filtering Processing to regulate resonance frequency.
The antenna system of the above-mentioned follow-on eas of traditional approach, wherein, the electric capacity of this tunable capacitor value is the capacitance group that a plurality of capability values electric capacity not of uniform size is formed, and can parallel connection or disconnection be set by short-circuit block.
The antenna system of the above-mentioned follow-on eas of traditional approach, wherein, the electric capacity of this tunable capacitor value is one group of electric capacity and last fine-tuning variable capacitance that fixed capacity is not of uniform size, can regulate resonance frequency accurately by the variable capacitance of fine setting.
The antenna system of the above-mentioned follow-on eas of traditional approach, wherein, the output of this LC resonant circuit also is connected with:
Differential amplifier is done the difference processing and amplifying to the received signal and is suppressed interference signal, and two inputs connect two outputs of this LC resonant circuit respectively, and also are connected with first switch between two inputs.
The antenna system of the above-mentioned follow-on eas of traditional approach, wherein, the output of this differential amplifier also is connected with:
Band-pass filter amplifier connects the output of this differential amplifier, comprising:
One operational amplifier;
Be arranged on the second switch on this operational amplifier one input;
Be parallel to the 2nd LC resonant circuit on this operational amplifier one input pickup resistance;
Three switch in parallel with the 2nd LC resonant circuit;
Controller connects first switch, second switch and the 3rd switch, controls the folding of these three switches.
The utility model contrast prior art has following beneficial effect: the utility model adopts the antenna of two kinds of complete multi-form and character as transmitting antenna and reception antenna, makes that transmitted pulse is zero to the residual influence of bar magnet reception antenna.The utility model, is adjusted the directivity that receives flexibly by the direction of regulating bar magnet, thereby can be covered the dead angle that some can not be checked through originally as reception antenna with one group of bar magnet.The bar magnet reception antenna adopts the resonance manner of 58kHz, plays filter action when received signal.The bar magnet reception antenna adopts differential arrangement to eliminate common mode disturbances.In addition, antenna system of the present utility model is easy to adjust, Current Feedback Control circuit and algorithms such as no PID, and the DSP resource of control section can be saved as other more senior algorithm steps.
Description of drawings
Fig. 1 is the schematic diagram of the pulse train of transmission antennas transmit.
Fig. 2 A is the structure chart of the transmitter and receiver antenna system of separating.
Fig. 2 B is the structure chart of the antenna system of transmitter and receiver one.
Fig. 3 A is the schematic diagram that receives the label resonance signal under the perfect condition.
Fig. 3 B is the schematic diagram that receives the label resonance signal under the virtual condition.
Fig. 4 is the structure chart of transmitting antenna of the present utility model.
Fig. 5 is the structure chart of reception antenna of the present utility model.
Fig. 6 is the adjustment schematic diagram of magnetic rod antenna of the present utility model.
Fig. 7 is the theory diagram of reception antenna part of the present utility model.
Fig. 8 is the schematic diagram of differential amplifier among Fig. 7 embodiment.
Fig. 9 is the schematic diagram of band-pass filter amplifier among Fig. 7 embodiment.
Figure 10 is the schematic diagram of gain amplifier and resonance frequency relation in the band-pass filter amplifier.
Figure 11 is the sequential schematic diagram of electronic switch.
Embodiment
The utility model will be further described below in conjunction with drawings and Examples.
Antenna system in the EAS of the present utility model system comprises partly these two parts of transmitting antenna part and reception antenna.The structure of transmitting antenna part is overlapped by antenna 12 under antenna 10 on the independent O word and the independent O word and to form as shown in Figure 4.And on the independent O word under antenna 10 and the independent O word antenna 12 both can also can be used as reception antenna and use separately as transmitting antenna.And the reception antenna part also comprises a magnetic rod antenna group 13 its structures and position as shown in Figure 5, it comprises that at least one magnetic rod antenna 13a is in antenna part on the independent O word, comprise that also at least one magnetic rod antenna 13b is in antenna part under the independent O word, the magnetic rod antenna group is used for receiving the resonance oscillation attenuation signal that is positioned at the label signal tail end.Please in conjunction with Fig. 6, magnetic rod antenna 13a and magnetic rod antenna 13b can do the adjustment on the angle along X, Y, Z axle, make magnetic rod antenna group 13 can cover the dead angle that some can not be checked through originally at the sensitivity of any direction adjustment reception.
See also Fig. 7, also be connected with a LC resonant circuit 21 on the magnetic rod antenna group 13, the inductance 211 of resonant circuit is wound on magnetic rod antenna 13a and the 13b, and the capacitance group 212 that the different electric capacity of a plurality of capacitances is formed is in parallel with inductance 211.The resonance frequency of this resonant circuit 21 is identical with the operating frequency of label, is generally 58kHz.This resonant circuit 21 can play filter action when received signal.
The output of LC resonant circuit 21 connects a differential amplifier 22, two inputs of differential amplifier 22 and the corresponding connection of two outputs of LC resonant circuit 21, and in the middle of two inputs of differential amplifier 22, also connecting an electronic switch K1, electronic switch connects controller 24.The amplifying circuit of differential amplifier 22 as shown in Figure 8, for two input Vi1 and Vi2, interference signal is identical at two inputs, be zero substantially after subtracting each other, therefore can eliminate common mode disturbances effectively, suppress the interference of various 58kHz frequencies in the environment, improve receiving sensitivity, improve the signal to noise ratio of surveying.
Output at differential amplifier 22 connects a band-pass filter amplifier 23, please be simultaneously referring to Fig. 9, this band-pass filter amplifier 23 comprises a common operational amplifier 231, be arranged on the input and the LC resonant circuit 232 in parallel with resistance R 3 of operational amplifier 231, electronic switch K3 also in parallel on LC resonant circuit 232, electronic switch K3 links to each other with controller 24.Connect an electronic switch K2 simultaneously on an input of operational amplifier 231, electronic switch K2 links to each other with controller 24.The output of operational amplifier 231 connects follow-up signal receiving circuit (not shown).The LC resonant circuit 232 here makes the gain of this operational amplifier 231 have the characteristic of frequency-selecting, sees also Figure 10, the variation of parallel resistor R3 with it of the resonance frequency variable effect of LC resonant circuit 232, thus influence the gain of band-pass filter amplifier 23.
See also Figure 11, when being in a burst length section that transmits, controller 24 is controlled electronic switch K1 closure under the effect of a low level signal, two input short circuits of differential amplifier 22, and differential amplifier 22 is in non operating state.Control electronic switch K2 simultaneously and disconnect, thereby disconnect being connected of band-pass filter amplifier 23 and differential amplifier 22.Controller 24 is controlled electronic switch K3 closure simultaneously, and LC resonant circuit 232 was lost efficacy because of short circuit.In this state, receive window is closed.
When transmitted pulse finishes and postpones the time (for example 200us), after the residual amount of energy of pulse to be launched disappears, what controller 24 received is the level signal of one-period, control electronic switch K1 disconnects under the effect of a high level signal, and two inputs of differential amplifier 22 normally connect two outputs of LC resonant circuit 21; Control electronic switch K2 closure, thus bandwidth filter amplifier 23 and differential amplifier 22 be communicated with; Control electronic switch K3 closure simultaneously, make LC resonant circuit 232 operate as normal.In this state, receive window is opened to receive label deamplification.
The foregoing description provides to those of ordinary skills and realizes or use of the present utility model; those of ordinary skills can be under the situation that does not break away from invention thought of the present utility model; the foregoing description is made various modifications or variation; thereby protection range of the present utility model do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (8)
1. the antenna system of the follow-on eas of traditional approach is characterized in that, described antenna system comprises:
The antenna sets part of one group of transmitting-receiving unification is made up of antenna under antenna on the independent O word annular and the independent O word annular, on this O word under antenna and this O word antenna be on the plane, these two antennas both can have been launched also and can receive;
One group of bar magnet reception antenna is used for receiving specially, further comprises:
At least two magnetic rod antennas, wherein at least one magnetic rod antenna is at the first half of entire antenna group, and at least one magnetic rod antenna is in the Lower Half of entire antenna group.
2. the antenna system of the follow-on eas of traditional approach according to claim 1 is characterized in that, these two O word loop aerials can be circle or oval ring antenna, also can be squaerial.
3. the antenna system of the follow-on eas of traditional approach according to claim 1 is characterized in that, the direction of magnetic rod antenna can adjust to change the directivity that signal receives.
4. the antenna system of the follow-on eas of traditional approach according to claim 1, it is characterized in that, those magnetic rod antennas are worked in LC resonant circuit mode, its resonance frequency equates with the label resonance frequency, the inductance of LC resonant circuit is wound on those bar magnets, the electric capacity of one tunable capacitor value is connected in parallel on this inductance, makes Filtering Processing to regulate resonance frequency.
5. the antenna system of the follow-on eas of traditional approach according to claim 4, it is characterized in that, the electric capacity of this tunable capacitor value is the capacitance group that a plurality of capability values electric capacity not of uniform size is formed, and can parallel connection or disconnection be set by short-circuit block.
6. the antenna system of the follow-on eas of traditional approach according to claim 4, it is characterized in that, the electric capacity of this tunable capacitor value is one group of electric capacity and last fine-tuning variable capacitance that fixed capacity is not of uniform size, can regulate resonance frequency accurately by the variable capacitance of fine setting.
7. the antenna system of the follow-on eas of traditional approach according to claim 4 is characterized in that, the output of this LC resonant circuit also is connected with:
Differential amplifier is done the difference processing and amplifying to the received signal and is suppressed interference signal, and two inputs connect two outputs of this LC resonant circuit respectively, and also are connected with first switch between two inputs.
8. the receiving system of the antenna of the follow-on eas of traditional approach according to claim 7 is characterized in that, the output of this differential amplifier also is connected with:
One band-pass filter amplifier connects the output of this differential amplifier, comprising:
One operational amplifier;
Be arranged on the second switch on this operational amplifier one input;
Be parallel to the 2nd LC resonant circuit on this operational amplifier one input pickup resistance;
Three switch in parallel with the 2nd LC resonant circuit;
Controller connects first switch, second switch and the 3rd switch, controls the folding of these three switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201625792U CN201015128Y (en) | 2006-12-30 | 2006-12-30 | Traditional mode modified type electronic article monitoring antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201625792U CN201015128Y (en) | 2006-12-30 | 2006-12-30 | Traditional mode modified type electronic article monitoring antenna system |
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| Publication Number | Publication Date |
|---|---|
| CN201015128Y true CN201015128Y (en) | 2008-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006201625792U Expired - Lifetime CN201015128Y (en) | 2006-12-30 | 2006-12-30 | Traditional mode modified type electronic article monitoring antenna system |
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| Country | Link |
|---|---|
| CN (1) | CN201015128Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102498504A (en) * | 2009-06-15 | 2012-06-13 | 阿德尔.奥德.塞耶夫 | Article surveillance system |
-
2006
- 2006-12-30 CN CNU2006201625792U patent/CN201015128Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102498504A (en) * | 2009-06-15 | 2012-06-13 | 阿德尔.奥德.塞耶夫 | Article surveillance system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080130 |
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| EXPY | Termination of patent right or utility model |