CN112037452B - Electronic article surveillance system, transmitter and surveillance signal generation method - Google Patents
Electronic article surveillance system, transmitter and surveillance signal generation method Download PDFInfo
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- CN112037452B CN112037452B CN202010945074.8A CN202010945074A CN112037452B CN 112037452 B CN112037452 B CN 112037452B CN 202010945074 A CN202010945074 A CN 202010945074A CN 112037452 B CN112037452 B CN 112037452B
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
- G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
- G08B13/2422—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using acoustic or microwave tags
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
- G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
- G08B13/2408—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using ferromagnetic tags
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
- G08B13/2428—Tag details
- G08B13/2431—Tag circuit details
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Computer Security & Cryptography (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Burglar Alarm Systems (AREA)
Abstract
The invention discloses an electronic commodity anti-theft system, a transmitter and an anti-theft signal generation method, and belongs to the field of electronic anti-theft. The invention generates a transmitting signal through the set pulse width, transmitting frequency, detecting period and pulse interval; the transmission frequency of all or part of the pulse signals of the transmission signal is formed by combining at least two frequencies in a single pulse signal, and the signals forming the transmission frequency can be combined freely. And the transmitting frequency of each pulse signal jointly completes the detection of a high frequency band, a middle frequency band and a low frequency band, or the detection of a full frequency domain. The invention also carries out low Q design on the transmitting antenna for transmitting the transmitting signal or the receiving antenna for receiving the transmitting signal so as to improve the amplitude-frequency characteristic of the scanning signal. The invention detects the label signal by combining a plurality of frequencies in a single pulse, can improve the probability of matching the label frequency in the same time compared with the frequency inspection technology, and can obtain more effective detection data under the same condition.
Description
Technical Field
The invention relates to the field of electronic burglary prevention, in particular to an Electronic Article Surveillance (EAS) signal generation method, an Electronic Article Surveillance (EAS) signal transmitter and an Electronic Article Surveillance (EAS) system.
Background
In the AI background, electronic Article Surveillance (EAS) devices are used in large numbers in vending venues today. The electronic commodity detecting device used in the store usually comprises an antenna frame arranged in an exit passage and a hidden embedded detecting system, detects whether people carry unpaid commodities out, and substantially detects electronic tags on the commodities so as to help the store reduce theft loss. The commodity electronic detection system mainly comprises products such as electromagnetism, acoustomagnetic products, radio frequency products and the like, and the corresponding working frequency is about 1KHZ to about 10MHZ. Because the equipment is in an open environment in a working state, the equipment is very easy to be interfered by surrounding electromagnetic waves, and the detected electronic anti-theft tag is a passive tag under most conditions, so that the energy is very weak, the normal operation of the system is seriously influenced, and even the system cannot be used at all. For a long time, how to solve the interference problem and improve the response sensitivity and the alarm accuracy are always important points considered in the industry. And an Acoustic Magnetic (AM) system is favored by the market because of its low use frequency and less influence of spatial electromagnetic waves.
A large number of common AM systems on the market can only transmit a single fixed frequency of 58KHz. High-end acousto-magnetic systems employ more complex detection techniques to ensure excellent performance, where multi-frequency detection means that the system must discriminate nearby signals, such as 57.9KHz, 58.1KHz, etc., in addition to transmitting 58KHz signals. The following brief description of the basic operating principles of the acousto-magnetic system;
t t representing a transmit pulse, one pulse unit length is about 1.5mS.
t r Representing a receive window, of approximately 1.5mS in length.
t t And t r With a segment delay therebetween, about 0.5mS is adjustable. Two-period interference is avoided.
t 1 Representing one detection cycle, common values of 20mS (for 50Hz power supply), 26mS, etc. One detection period may emit one or more t t 。
t n Represents a detection group consisting of a plurality of t 1 And one detection group or a plurality of detection groups complete alarm judgment.
The design value of the label frequency is 58KHz, and the device is at t t A 58KHz signal is transmitted. When the tag approaches the device, resonance occurs, as shown in fig. 1, and tag oscillation is maintained after transmission stops, which is exactly the receiving window t r And in time period, the system collects data and judges whether to alarm or not. Usually in the presence of a valid signal S n When the energy reaches the design value, a suspected label appears and an alarm is given.
And setting a sampling effective value X.
The number of sampling sequences n.
And d, correcting the quantity.
t r The total number of receive window samples f.
The precision and consistency of the frequency of the label are bottlenecks in the development of the industry due to the influence of factors such as production process, forging of raw materials and even geomagnetic field, and the detection sensitivity and reliability of the equipment are restricted. To compensate for this problem, high-end acousto-magnetic systems use multiple frequencies
The detection technology is called as frequency polling technology. E.g. different t 1 Different emission frequencies (for example, emission frequencies of 57.9KHz, 58KHz and 58.1KHz are respectively used for three continuous detection periods), one detection group completes one round of inspection, and the reaction of the frequency used in which detection period is the largest, then a signal of the frequency is emitted in a next detection group in a targeted manner to judge whether to alarm, and as shown in fig. 2, the detection result is a detection result of 7 detection periods.
The frequency inspection technology greatly improves the system performance, particularly the sensitivity of the soft label is very obvious, but the problem is also very obvious. In a detection group, although the more the used transmission frequency is, the higher the probability of being able to detect the tag is, correspondingly, the more the detection period is required, that is, in the same time, the less effective judgment data is obtained, and the reliability of the system is reduced.
Similarly, there is a transceiver in the rf system, commonly called as MONO, which is different from the conventional door-to-door system composed of a transmitter and a receiver, and the MONO also adopts a pulse operation mode, which is closer to the above mentioned acousto-magnetic system except for frequency.
Both acousto-magnetic and radio frequency MONO systems face frequency uncertainty in detecting tags, such as tags produced at 58KHz or 8.2MHz, which is a system tolerance due to process errors, where the actual product may be 58.1KHz or 8.3 MHz. If the transmit pulse is detected at only 58KHz or 8.2MHz, the sensitivity is reduced. In the prior art, the transmitted pulse closest to the frequency of the tag is searched by adopting an inspection mode, the probability of matching the frequency of the tag can be improved by adopting the mode, but the transmitted pulse of the inspection mode only has a fixed frequency signal every time, a large amount of time is consumed for one round of inspection, and the alarm can be missed to form the missed alarm.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the Electronic Article Surveillance (EAS) signal generation method is provided to acquire more effective data in the same time and improve the reliability of the system.
The technical scheme adopted by the invention is as follows:
an Electronic Article Surveillance (EAS) signal generation method, comprising: generating a transmitting signal through the set pulse width, transmitting frequency, detection period and pulse interval; the transmission frequency of all or part of the pulse signals of the transmission signals is formed by combining at least two frequencies in a single pulse signal. The transmitting signal is composed of a plurality of pulses, the pulse width, the number and the pulse interval are determined according to set parameters, and the transmitting signal is characterized in that in the pulses forming the transmitting signal, part or all of the transmitting frequency is not fixed and is formed by at least two frequencies, so that the probability of matching the label frequency in the same time is improved, compared with a frequency inspection technology, the more the number of the pulse signals capable of matching the label frequency in the same time is, the more the obtained effective judgment data is, and in fact, the more the used transmitting frequency is, the more the achieved effect is obvious.
Further, the transmitting frequency of the pulse signal formed by combining at least two frequencies is changed from high frequency to low frequency in sequence, or from low frequency to high frequency in sequence, or from the center frequency to both sides of high and low in turn, or randomly combined and changed.
Further, the transmission frequency of each pulse signal of the transmission signal jointly completes the detection of the high frequency band, the middle frequency band and the low frequency band, or the detection of the full frequency domain. The set transmission frequency can simultaneously comprise a high frequency band, a middle frequency band and a low frequency band, or comprise a full frequency domain, and the set transmission frequency range is distributed into a plurality of pulse signals when the transmission frequency of one pulse signal cannot cover all the set frequencies.
Further, a transmitting antenna for transmitting the transmission signal generated by the electronic article surveillance signal generation method and/or a receiving antenna for receiving the transmission signal generated by the electronic article surveillance signal generation method are designed with a low Q. The low-Q design of the transmitting antenna or the receiving antenna can enable the edge of a scanning signal (detection waveform) to be more flattened, and can improve the amplitude-frequency characteristic of the scanning signal.
In order to solve all or part of the problems, the invention also provides an Electronic Article Surveillance (EAS) signal transmitter, which generates a transmitting signal according to the set pulse width, transmitting frequency, detection period and pulse interval; all or part of the pulse signals of the transmitting signals are in a single pulse signal, and the transmitting frequency is formed by combining at least two frequencies.
Further, the transmitting frequency of the pulse signal formed by combining at least two frequencies is changed from high frequency to low frequency in sequence, or from low frequency to high frequency in sequence, or from the center frequency to both sides of high and low in turn, or randomly combined and changed.
Further, the transmission frequency of each pulse signal of the transmission signal jointly completes the detection of the high frequency band, the middle frequency band and the low frequency band, or the detection of the full frequency domain.
Further, the transmitting antenna of the transmitter is of a low-Q design.
Further, when the tag signal is detected, the transmitter uses the segmented frequency or the fixed frequency used when the tag signal is detected as the transmission frequency in the subsequent generation of the transmission signal. After the tag signal is detected in a frequency scanning mode, the tag signal does not need to be detected blindly, and an effective detection signal can be obtained only by locking the corresponding transmitting frequency, so that the workload and the power consumption of a transmitter can be reduced, and a better effective detection signal can be obtained.
The invention also provides an Electronic Article Surveillance (EAS) system, which comprises the electronic article surveillance signal transmitter and a receiver matched with the electronic article surveillance signal transmitter.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the scheme designed by the invention, the label signal is detected by combining a plurality of frequencies in a single pulse, compared with a frequency inspection technology, the probability of matching the label frequency can be improved in the same time, more effective detection data (judgment data) can be obtained under the same condition, and the effect is more obvious under the condition that the used detection frequency is more.
2. The invention adopts a high, middle and low frequency band combined detection or full frequency domain detection mode, can finish blind detection on an unknown detection label, namely accurately detect a label signal under the condition of not knowing which central frequency the label uses, and has high detection efficiency and effectiveness.
3. The antenna related to the invention is greatly different from the existing design, namely, the antenna adopts a low-Q design and is matched with the frequency sweeping technology adopted by the invention, so that the amplitude-frequency characteristic of the scanned waveform can be effectively improved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram of a scanning signal for an electronic article surveillance EAS system to detect a tag.
FIG. 2 is a schematic diagram of the response of the frequency polling technique to blindly detect the 58KHz tag.
Fig. 3 is a schematic diagram of the frequency of the single pulse in the frequency polling technique and the present invention.
FIG. 4 is a schematic diagram of scanning signals under a high Q antenna and a low Q antenna.
Fig. 5 is a schematic diagram of a response waveform of a frequency of a tag detected by a scanning signal.
Detailed Description
All of the features disclosed in this specification, or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example one
A method for generating electronic article surveillance signals is applied to an Electronic Article Surveillance (EAS) system, and comprises the following steps:
generating a transmitting signal through the set pulse width, transmitting frequency, detection period and pulse interval; the emission frequency is in a single emission pulse and includes a scanning frequency, that is, the emission pulses in the detection period may all be the scanning frequency, or may be a combination of a fixed frequency and the scanning frequency. The scanning frequency is not a fixed frequency, i.e., the so-called scanning frequency is a frequency that scans the left and right sides with the center frequency of the tag as the center. The scanning frequency can be scanned from low to high in sequence, or scanned from high to low in sequence, or scanned from the center frequency to the high and low two sides in turn, or randomly scanned and combined, so that the transmitting frequency in a single transmitting pulse is ensured to be formed by combining two or more different frequencies. The scanning frequency format can improve the probability of matching to the label frequency, and for the critical value of the label frequency, the fixed frequency can improve the accuracy of alarming. The emission frequency in one detection period can be scanned in a segmented mode, namely high, medium, low frequency and other frequency bands and full frequency domain hybrid scanning. The so-called segmented scanning is that when the set transmission frequency is more or dispersed, if not all the transmission frequencies are combined in one transmission pulse, more than two transmission pulses are used to combine the set transmission frequency, for example, the set transmission frequency includes three frequency bands of high, middle and low frequencies, then three pulses are used to respectively use the transmission frequencies of high, middle and low frequency bands, and the coverage of the set transmission frequency is completed through the combination of multiple frequencies inside the pulses and the combination of frequencies between the pulses, so as to further quickly find the pulse closest to the tag frequency, so as to find and lock the transmission frequency. The full frequency domain scanning is to complete the coverage of the full frequency domain for the emission frequency in one detection period. Thus, the transmission frequencies of the pulse signals forming the transmission signal are different or not identical; the transmission frequency within a single pulse signal includes all or part of the set transmission frequency.
Taking the center frequencies of 58khz, t1, t2, and t3 as examples to represent three detection periods, respectively, the conventional frequency polling technique is that in three detection periods of t1, t2, and t3, t1 adopts 57.9khz, t2 adopts 58khz, and t3 adopts 58.1KHz transmission frequency, but the pulse signal of the present invention contains transmission frequencies of 57.9KHz, 58KHz, and 58.1KHz (or other combinations) in a single detection period (e.g., t 1), as shown in fig. 3, a schematic diagram of a pulse signal of the conventional frequency polling technique and the design scheme of the present embodiment is shown. That is, three detection cycles were previously required to scan three frequencies, whereas the present patent completed only one detection cycle, which is three times shorter. The detection speed is accelerated.
Furthermore, the alarm judgment time is designed to be 100ms, the single detection period is 20ms, namely, only 5 detection periods exist in one detection group, namely, 5 judgment data are possessed, and the less the data, the poorer the accuracy is. Taking the above 3 transmission frequencies as an example, the existing frequency patrol technology needs 3 detection cycles for polling the 3 frequencies, which takes 3 × 20=60ms, if there is a tag, only one of the 3 data is valid data closest to the tag frequency, and the other two data are invalid due to the frequency difference. After the label frequency is detected, the system stops scanning in the next working time, the label frequency is directly locked by the EASLOCK technology, 2 pulses are emitted, the previous 3 polling pulses are added, and the 100mS detection period is completed. As a result, 2 pulses are wasted due to the deviation of the polling from the label frequency, only 3 pulses are effective for detecting 5 pulses, the reliability of the system is obviously reduced, and if the detection of 60ms is calculated to be beyond 100ms consumed by the detection group, namely the alarm judgment time is increased to 160ms, the anti-theft system can not respond timely and even fail to report. In fact, the polling frequency may be more than three, and in an interference environment, the anti-theft system also repeatedly judges and eliminates the interference frequency, which means that more time is required to deal with the problems. The invention changes the transmitting frequency in a single detection period from the original fixed frequency into the scanning frequency, and 3 transmitting frequencies can finish detection in 1 detection period, so that the problem that the frequency is diagnosed repeatedly and the alarm opportunity is wasted is avoided.
In the implementation, the quality of the detected waveform also needs to be considered. The signal generated by the method can detect the label signal in time and judge the label from the detected waveform, but the effect of detecting the waveform can be further improved. Experiments prove that the Q values of the transmitting coil and the receiving coil (antenna) are designed in an opposite way to that of the conventional EAS system, the conventional EAS system needs to carry out high-Q design on the antenna to improve the efficiency of a power amplifier, and the coil Q value is designed to be low-Q in the design, so that the detected waveform can obtain better flatness. For example, in the conventional EAS system, the number of the transmitting and receiving coils is 8 or 9, the inductance is 270uH, and in the present invention, the number of the coils is 4, and the inductance is 33uH, so that the amplitude-frequency characteristic of the output detection waveform can be significantly improved, as shown in fig. 4, the former is designed as a high-Q antenna, the amplitude-frequency characteristic of the scanning signal is poor, and the latter is designed as a low-Q antenna, the amplitude-frequency characteristic of the scanning signal is good.
The scheme of the invention can be applied to an Acoustic Magnetic (AM) electronic article anti-theft detection system and can also be applied to a Radio Frequency (RF) electronic article anti-theft detection system.
Electronic article surveillance detection systems allow integration of a transmitter and a receiver, such as a MONO (radio frequency) or AMMONO (acoustic magnetic). During transmitting, the receiving circuit is closed, and during receiving, the transmitting circuit is closed. Therefore, although the transmitter and the receiver are integrated, the simplex mode is adopted in practice, namely, the transmitting circuit and the receiving circuit work in a time-sharing mode without mutual influence.
Example two
The embodiment discloses an Electronic Article Surveillance (EAS) signal transmitter which generates a transmission signal according to a set pulse width, a transmission frequency, a detection period and a pulse interval, wherein the transmission frequency is a scanning frequency in a single detection period.
The scanning frequency can be scanned from low to high in sequence, or scanned from high to low in sequence, or scanned from the center frequency to the high and low two sides of the frequency in turn, or randomly scanned and combined, so that the emission frequency in a single detection period is ensured to be formed by combining two or more frequencies. The transmitting frequency can be segmented scanning, namely high, medium, low frequency and other frequency bands or full frequency domain mixed scanning.
Further, the transmitting antenna of the transmitter is designed to have low Q so as to improve the amplitude-frequency characteristic of the scanning signal.
It has already been mentioned that the emission frequency in a single detection period is designed as a scanning frequency, so that the tag signal can be detected with a high probability in a single detection period. And on the basis of detecting the label frequency, locking the label signal by adopting a segmented scanning or fixed frequency mode and the like. The so-called segmented scanning or fixed frequency locking method, for example, locks the tag frequency by using EASLOCK technology, i.e., after the tag frequency is preliminarily detected, in order to further confirm the tag or acquire more valid data, the pulse signal continues to be transmitted by using EASLOCK technology to lock the transmission frequency to the frequency (or combination) used when the detected tag frequency is detected. It should be noted that the frequency of the transmitted pulse signal is no longer a blind frequency patrol, but the transmitted frequency is locked to (or near) the detected tag frequency.
EXAMPLE III
An electronic article surveillance detection (EAS) system comprises a transmitter and a receiver, wherein the transmitter generates a transmission signal according to a set pulse width, a transmission frequency, a detection period and a pulse interval, wherein the transmission frequency is a scanning frequency in a single detection period. The scanning frequency can be scanned from low to high in sequence, or scanned from high to low in sequence, or scanned from the center frequency to the high and low two-side frequencies in turn, or randomly scanned and combined, so that the emission frequency in a single detection period is ensured to be formed by combining two or more frequencies. The transmitting frequency can be segmented scanning, namely high, medium, low frequency and other frequency bands or full frequency domain mixed scanning. The receiver parameters are matched to the transmitter.
In order to improve the amplitude-frequency characteristic of the detected waveform received by the receiver, the transmitting antenna and/or the receiving antenna of the system are designed to be low-Q.
Further, after the transmitter finds the tag signal in the polling detection waveform received by the receiver, as shown in fig. 5, the EASLOCK locking technique is applied to stop the overall scanning, the frequency (the transmission frequency used by the detected pulse of the tag frequency) is locked, and the transmission signal is generated by adopting a segmented scanning or fixed frequency mode, and the like, and the transmission is continued so that the system can confirm the alarm data.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. An Electronic Article Surveillance (EAS) signal generation method is applied to an acousto-magnetic electronic article surveillance detection system and comprises the following steps:
generating a transmitting signal through the set pulse width, transmitting frequency, detection period and pulse interval; it is characterized in that the preparation method is characterized in that,
the transmitting signal consists of a plurality of pulse signals, the transmitting frequency of all or part of the pulse signals of the transmitting signal is in a single pulse signal and is formed by combining at least two frequencies, and pulses of all the frequencies are continuous in time; the transmitting frequencies of the pulse signals are different or not identical, the transmitting frequency in a single pulse signal comprises all or part of the set transmitting frequency, and the set transmitting frequency is covered by the combination of a plurality of transmitting frequencies in the pulse signal and the combination of the transmitting frequencies among the pulse signals.
2. The electronic article surveillance EAS signal generating method as claimed in claim 1, wherein the transmission frequency of the pulse signal is a combination of at least two frequencies, and the transmission frequency is sequentially changed from a high frequency to a low frequency, or from a low frequency to a high frequency, or alternately changed from a center frequency to high and low sides, or randomly combined.
3. The electronic article surveillance EAS signal generation method of claim 1 or 2, wherein the transmission frequencies of the respective pulse signals of the transmission signal jointly perform detection of a high frequency band, a medium frequency band and a low frequency band, or detection of a full frequency domain.
4. The electronic article surveillance EAS signal generation method of claim 1, wherein a transmit antenna that transmits a transmit signal generated by the electronic article surveillance signal generation method and/or a receive antenna that receives a transmit signal generated by the electronic article surveillance signal generation method are low-Q designed.
5. An Electronic Article Surveillance (EAS) signal transmitter is applied to an acousto-magnetic electronic article surveillance detection system, and generates a transmission signal according to a set pulse width, a set transmission frequency, a set detection period and a set pulse interval; the method is characterized in that the transmitting signal consists of a plurality of pulse signals, all or part of the pulse signals of the transmitting signal are in a single pulse signal, the transmitting frequency is formed by combining at least two frequencies, and pulses of the frequencies are continuous in time; the transmitting frequencies of the pulse signals are different or not identical, the transmitting frequency in a single pulse signal comprises all or part of the set transmitting frequency, and the set transmitting frequency is covered by the combination of a plurality of transmitting frequencies in the pulse signal and the combination of the transmitting frequencies among the pulse signals.
6. An electronic article surveillance EAS signal transmitter as claimed in claim 5, characterised in that the transmission frequency of the pulsed signal is a combination of at least two frequencies, the transmission frequency varying sequentially from high to low frequency, from low to high frequency, or alternately from the centre frequency to the high and low sides, or a random combination thereof.
7. The electronic article surveillance EAS signal transmitter of claim 6, wherein the transmit frequencies of the respective pulse signals of the transmit signal collectively perform detection of a high frequency band, a medium frequency band, and a low frequency band, or detection of a full frequency domain.
8. The electronic article surveillance EAS signal transmitter of claim 5, wherein a transmit antenna of the transmitter is of a low-Q design.
9. The Electronic Article Surveillance (EAS) signal transmitter of claim 5, wherein upon detection of a tag signal, the transmitter employs a segmented frequency or a fixed frequency used in detection of the tag signal as a transmission frequency in subsequent generation of the transmission signal.
10. An acousto-magnetic Electronic Article Surveillance (EAS) system comprising an electronic article surveillance signal transmitter according to any one of claims 5 to 9 and a receiver matched to said electronic article surveillance signal transmitter.
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| 天线基础知识;happysun108;《百度文库：https://wenku.baidu.com/view/ca5b858583d049649b66584f.html》;20100901;第1-9页 * |
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