CN105389605B - The three-dimensional channel device of special-shaped antenna - Google Patents
The three-dimensional channel device of special-shaped antenna Download PDFInfo
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- CN105389605B CN105389605B CN201510764315.8A CN201510764315A CN105389605B CN 105389605 B CN105389605 B CN 105389605B CN 201510764315 A CN201510764315 A CN 201510764315A CN 105389605 B CN105389605 B CN 105389605B
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Abstract
The present invention relates to a kind of three-dimensional channel devices of special-shaped antenna, including power module；Frequency read/write, input terminal connect the output end of power module；Be time-multiplexed module, and input terminal connects the output end of frequency read/write；And two special-shaped antenna groups, it is all connected with the output end of time division multiplexing module；One in two special-shaped antenna groups includes that the magnetic direction that generates is identical and two parallel antenna frames with spacing, another includes that the magnetic direction that generates is opposite and two parallel antenna frames with spacing；Wherein, power module is for providing power supply, frequency read/write is for generating radiofrequency signal and control signal, the module that is time-multiplexed is used for radio signal transmission to two special-shaped antenna groups under the action of control signal, two special-shaped antenna groups be used for by radiofrequency signal send the RF tag of detection surrounding and when detecting RF tag feedback signal to frequency read/write.The present invention can be improved the detection efficiency of label and reduce cost.
Description
Technical field
The present invention relates to radio frequency identification (RFID, Radio Frequency Identification) technical fields, especially
It is to be related to a kind of three-dimensional channel device of special-shaped antenna.
Background technology
RFID system generally mainly include control emission of radio frequency signals, reception and information processing reader, with read-write
The radio-frequency antenna that device matches needs the RF tag for being detected identification.In normal work, reader is responsible for sending according to one
The data command for determining protocol code, by inside reader modulation and power amplifier after, will produce carrying for certain power
The radiofrequency signal of order is radiated the certain area around radio-frequency antenna, when qualified RF tag by radio-frequency antenna
Into the field region, the energy that magnetic field carries can activate RF tag, RF tag that can parse the life of reader transmission
Information is enabled, and self-contained relevant information is modulated on magnetic field according to order, connecing for reader is fed back to by radio-frequency antenna
Circuit is received, after reader parses the information received, record accordingly or acousto-optic instruction is carried out, completes to RF tag
Detection and reading.In RFID system, radio-frequency antenna plays a crucial role, it determines the radio frequency letter of reader transmitting
Number read spatial dimension and direction usually form antenna array by multiple radio-frequency antennas in existing three-dimensional channel device
Then row realize that the three-dimensional of label is read by switching radio-frequency antenna.
The aerial array of existing three-dimensional channel device is generally made of six or four antennas.Six aerial array distributions
Usually channel both sides have certain overlapping, and in order to realize without blind respectively there are three rectangle frame antenna between three antennas
Area is read, and is understood power divider, antenna switching unit to carry out the control work of respective antenna, is being carried out antenna switching and work(
Rate may require that longer poll time during distributing, and the transmission power of reader can weaken accordingly corresponding detection away from
Defection reduces.Four aerial arrays are similar with the distribution of six aerial arrays, only overlapping of four aerial arrays in upper and lower two frames
Bigger on area has a greater degree of reduction on the Active Area and detection result of label, and training in rotation works a week
The time of phase is longer, and skip or the incomplete phenomenon of reading are than more serious when detecting more label.For six antennas and four
Aerial array group, idle antenna also have large effect to the antenna of work.
Invention content
Based on this, it is necessary to a kind of three-dimensional channel device of special-shaped antenna is provided, while realizing the three-dimensional reading of label
Effectively reduce skip rate.
A kind of three-dimensional channel device of special-shaped antenna, including：
Power module；
Frequency read/write, the input terminal of the frequency read/write connect the output end of the power module；
Be time-multiplexed module, and the input terminal of the time division multiplexing module connects the output end of the frequency read/write；And
Two special-shaped antenna groups, described two special-shaped antenna groups are all connected with the output end of the time division multiplexing module；
One in described two special-shaped antenna groups includes that the magnetic direction that generates is identical and two with spacing are parallel
Antenna frame, another includes that the magnetic direction that generates is opposite and two parallel antenna frames with spacing；
Wherein, the power module is used to provide power supply, the radio frequency to the frequency read/write and time division multiplexing module
Reader is used to generate the radiofrequency signal and the control signal for controlling the time division multiplexing module for carrying that label reads and operates,
The time division multiplexing module is used for radio signal transmission under the action of the control signal to two special-shaped antenna groups, described
Two special-shaped antenna groups are used to radiofrequency signal sending the RF tag around detection and are detecting the RF tag
When feedback signal to the frequency read/write.
The three-dimensional channel device of special-shaped antenna described above, using two special-shaped antenna groups, in two special-shaped antenna groups
Certain spacing is all had between parallel antenna frame, the detection height of label can be improved in the part not being overlapped；Two special-shaped days
The magnetic direction that the parallel antenna frame of one in line group included two generates is identical, another two parallel day for being included
The magnetic direction that wire frame generates is opposite so that the magnetic field that two special-shaped antenna groups generate has complementary effect, increases label
Detection range；Two special-shaped antenna groups under the action of controlling signal can time-sharing work, and two special-shaped antenna groups can be quick
Switching, can effectively improve the detection efficiency of label；Two special-shaped antenna groups do not have to setting antenna as in the prior art and switch mould
Block and power distribution module can effectively reduce production cost.
The power module includes in one of the embodiments,：
Conversion circuit, for by external power supply be converted to can be the frequency read/write and time division multiplexing module provide it is low
Straightening galvanic electricity.
The frequency read/write includes in one of the embodiments,：
Microcontroller chip；
The radio frequency transmitter circuitry being connect with the microcontroller chip；
The RF receiving circuit being connected with the microcontroller chip；And
The control circuit being connect with the microcontroller chip；
The radio frequency transmitter circuitry, which is used to generate, carries the radiofrequency signal that label reads and operates, the radio frequency reception electricity
Road is used for for receiving the signal that described two special-shaped antenna groups are fed back when detecting RF tag, the microcontroller chip to institute
The signal for stating feedback is analyzed, and the control circuit is used to generate the control signal for controlling the time division multiplexing module.
The time-sharing multiplex module includes in one of the embodiments,：
Control switching circuit；And
The HF switch being connect respectively with described two special-shaped antenna groups；
The control switching circuit is used to drive the opening of the HF switch under the action of control signal and close
It closes；
One input terminal being connect with the radio frequency transmitter circuitry of connection, the HF switch are equal jointly for the HF switch
There are one output ends for tool, and the HF switch is connected by the output end with the corresponding special-shaped antenna group；
Wherein, when the HF switch being driven to be closed under the action of the control signal when the control switching circuit,
The special-shaped antenna group being correspondingly connected with the HF switch is started to work, and the radio frequency transmitter circuitry sends out the radiofrequency signal of generation
It send to the special-shaped antenna group；When the control switching circuit drives the HF switch to beat under the action of the control signal
When opening, the radio frequency for generating the radio frequency transmitter circuitry that is stopped with the special-shaped antenna group that the HF switch is correspondingly connected with is believed
Number keep apart with the special-shaped antenna group.
The control signal is current signal in one of the embodiments, corresponding, and the control switching circuit is electricity
Conversion circuit is flowed, and the current converter circuit drives the high frequency to open by the way that the current signal is converted to heavy current signal
The opening and closing of pass.
Described two special-shaped antenna groups are respectively connected in one of the embodiments, carries out impedance to the special-shaped antenna group
Matched antenna match module, the output end of the corresponding HF switch of input terminal connection of the antenna match module are described
The output end of antenna match module connects the special-shaped antenna group；
Wherein, when the HF switch being driven to be closed under the action of the control signal when the control switching circuit,
The antenna match module carries out impedance matching to the special-shaped antenna group, extremely by the frequency resonance of the special-shaped antenna group
13.56M, output impedance are converted into 50 Ω, meanwhile, the special-shaped antenna group is started to work, and the radio frequency transmitter circuitry will generate
Radiofrequency signal be sent to the special-shaped antenna group.
The parallel antenna frame is echelon antenna frame in one of the embodiments,.
The echelon antenna frame is right-angled trapezium antenna frame in one of the embodiments,.
The angle at the on-right angle base angle of the right-angled trapezium antenna frame is 45 degree in one of the embodiments,.
The bevel edge of two right-angled trapezium antenna frames in described two special-shaped antenna groups is mutual in one of the embodiments,
Alignment is placed in parallel, and the vertical range between the bevel edge of described two right-angled trapezium antenna frames and any of which right-angled trapezium
Ratio between the length on the shorter bottom edge of antenna frame is 1：5.
Description of the drawings
Fig. 1 is the structure chart of the three-dimensional channel device of the special-shaped antenna of an embodiment；
Fig. 2 is the structure chart of two special-shaped antenna groups in Fig. 1.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, the three-dimensional channel device of the special-shaped antenna of an embodiment includes：
Power module 110；
Frequency read/write 120, the input terminal of frequency read/write 120 connect the output end of the power module 110；
Be time-multiplexed module 130, the output end of the input terminal connection frequency read/write 120 of time division multiplexing module 130；And
Two special-shaped antenna groups 150 and 160, two special-shaped antenna groups are all connected with the output end of time division multiplexing module 130；
One (being special-shaped antenna group 150 in the present embodiment) in described two special-shaped antenna groups includes the magnetic field side generated
To two parallel antenna frames identical and with spacing, another (being special-shaped antenna group 160 in the present embodiment) includes generating
Magnetic direction is opposite and has two parallel antenna frames of spacing；
Wherein, power module 110 is used to provide power supply, radio frequency read-write to frequency read/write 120 and time division multiplexing module 130
Device 120 is used to generate the control signal for carrying radiofrequency signal and control time division multiplexing module 130 that label reads and operates, when
It is divided to Multiplexing module 130 to be used for radio signal transmission to two special-shaped antenna groups, two special-shaped days under the action of controlling signal
Line group be used for by radiofrequency signal send RF tag around detection and when detecting RF tag feedback signal to penetrating
Frequency reader 120.
The three-dimensional channel device of special-shaped antenna described above, using two special-shaped antenna groups, in two special-shaped antenna groups
Certain spacing is all had between parallel antenna frame, the detection height of label can be improved in the part not being overlapped；Two special-shaped days
The magnetic direction that the parallel antenna frame of one in line group included two generates is identical, another two parallel day for being included
The magnetic direction that wire frame generates is opposite so that the magnetic field that two special-shaped antenna groups generate has complementary effect, increases label
Detection range；Two special-shaped antenna groups under the action of controlling signal can time-sharing work, and two special-shaped antenna groups can be quick
Switching, can effectively improve the detection efficiency of label；Two special-shaped antenna groups do not have to setting antenna as in the prior art and switch mould
Block and power distribution module can effectively reduce production cost.
Wherein, power module 110 includes conversion circuit, and it can be that radio frequency is read and write that conversion circuit, which is used to be converted to external power supply,
The low-voltage DC that device 120 and time division multiplexing module 130 provide.External power supply is usually high-voltage alternating alternating current, it is necessary to by turning
It can just be used after alternatively, to ensure the well-formedness used and safety.
Frequency read/write 120 includes：
Microcontroller chip；
The radio frequency transmitter circuitry being connect with microcontroller chip；
The RF receiving circuit being connected with microcontroller chip；And
The control circuit being connect with microcontroller chip.
Radio frequency transmitter circuitry, which is used to generate, carries the radiofrequency signal that label reads and operates, and RF receiving circuit is for connecing
The signal that two special-shaped antenna groups are fed back when detecting RF tag is received, microcontroller chip is for dividing the signal of feedback
Analysis, control circuit are used to generate the control signal of control time division multiplexing module.Different processing chips may be used in microcontroller chip,
The functions such as it can also realize the information decoding after label detection, data report, permission judges.Frequency read/write 120 is to complete
The processing center that radiofrequency signal generates and the label signal that finally feeds back receives, in the present embodiment, frequency read/write 120 also generates
Control signal is to control time division multiplexing module 130.
Specifically, time-sharing multiplex module 130 includes control switching circuit and the height being connect respectively with two special-shaped antenna groups
Frequency switchs, opening and closing of the control switching circuit for driving HF switch under the action of controlling signal, and HF switch is total
With one input terminal being connect with radio frequency transmitter circuitry of connection, HF switch all has an output end, and HF switch passes through defeated
Outlet is connected with corresponding special-shaped antenna group；Wherein, when control switching circuit HF switch is driven under the action of controlling signal
When closure, the special-shaped antenna group being correspondingly connected with HF switch is started to work, and radio frequency transmitter circuitry sends out the radiofrequency signal of generation
It send to special-shaped antenna group；When control switching circuit drives HF switch to open under the action of controlling signal, with HF switch
The special-shaped antenna group being correspondingly connected with, which is stopped, keeps apart the radiofrequency signal that radio frequency transmitter circuitry generates with special-shaped antenna group.
In the present embodiment, due to the form using two special-shaped antenna group time-sharing works, can using minimal number of HF switch and
In the case of control switching circuit, the readable region of label, and two special-shaped antenna group time-sharing polling work are significantly greatly increased, it can phase
Other side blind area mutually is made up, so as to realize the three-dimensional reading of label, effectively reduce skip rate.
Since control signal is accomplished that the control to HF switch, the control circuit for generating control signal can be with
It is the simple circuit for generating switching signal control, can be integrated with microcontroller chip, or with microcontroller chip
An individual control circuit for connection.It can be current signal to control signal, and corresponding control switching circuit is converted for electric current
Circuit, current converter circuit by current signal by being converted to the opening and closing that heavy current signal drives HF switch.Usually
The current signal that frequency read/write 120 generates is weaker, is unable to control HF switch, can control after being converted to heavy current signal
HF switch can also improve the accuracy of control, when two special-shaped antenna groups switch, improve the success rate of switching, in turn
Improve the read rate of label.
As shown in Figure 1, two special-shaped antenna groups are respectively connected with the antenna match mould for carrying out impedance matching to special-shaped antenna group
Block 140, the output end of the corresponding HF switch of input terminal connection of antenna match module 140, the output end of antenna match module 140
Connect special-shaped antenna group；Wherein, when HF switch being driven to be closed under the action of controlling signal when control switching circuit, antenna
Impedance matching is carried out to special-shaped antenna group with module 140, by the frequency resonance of special-shaped antenna group to 13.56M, output impedance transformation
To 50 Ω, meanwhile, special-shaped antenna group is started to work, and the radiofrequency signal of generation is sent to special-shaped antenna group by radio frequency transmitter circuitry.
After impedance matching being carried out by antenna match module 140, it is ensured that radiofrequency signal that frequency read/write 120 is sent out is as much as possible to be arrived
It is radiate up to the special-shaped antenna group of work, and by special-shaped antenna group.
As shown in Fig. 2, two parallel antenna frames are echelon antenna frame in two special-shaped antenna groups 150 and 160.In order to
Ensure that the readable region of the label of three-dimensional channel device is sufficiently large, embodiment adds the height of echelon antenna frame, and parallel
Echelon antenna frame between have certain spacing, the overlapping between antenna frame is avoided, therefore, without relying upon between antenna
Overlapping area eliminates check frequency, can directly increase the readable region area to label.It is formed due to two special-shaped antenna groups
Magnetic field can have the blind area of a different directions among corresponding special-shaped antenna group respectively, which can be to the pendulum between channel
It puts spacing and generates certain influence, therefore, it is necessary to the magnetic fields of different directions to make up intermediate blind area, so two are used in the present embodiment
The form of the opposite special-shaped antenna group complementation in a intermediate direction is specific as shown in Fig. 2, being put parallel in the special-shaped antenna group of left side in figure
The antenna frame set can generate identical magnetic direction, and the antenna frame placed parallel in the special-shaped antenna group of right side can generate opposite magnetic
Field direction.
Preferably to realize complementation, as shown in Fig. 2, antenna frame is right-angled trapezium antenna, and right-angled trapezium antenna frame
The angle at on-right angle base angle is 45 degree, such as angle, θ=45 ° marked in Fig. 2.
As shown in Fig. 2, echelon antenna frame in two special-shaped antenna groups is when placing, two bevel edges of echelon antenna frame it
Between spacing size can change the label of intermediate region and read blind area, and the spacing of two bevel edges is smaller, horizontal direction detection
Distance is remoter.To achieve the effect that reduce blind area, the bevel edge of two right-angled trapezium antenna frames in two special-shaped antenna groups is mutual
Alignment is placed in parallel, and the vertical range between the bevel edge of two right-angled trapezium antenna frames and any of which right-angled trapezium antenna
Ratio between the length on the shorter bottom edge of frame is 1：The L marked in 5, i.e. Fig. 2:D is 5:1.
Specifically, the present embodiment may be accomplished by：
Power module 110 connects external power supply and powers on, and frequency read/write 120 completes the initialization of relevant parameter, establishes phase
The communication of pass connects；
After the completion of the master data normal load of frequency read/write 120, output control signal and radiofrequency signal, wherein controlling
Signal is sent to time division multiplexing module 130 and controls the HF switch conducting in time division multiplexing module 130, makes corresponding different
Shape antenna sets 150 are in running order, while antenna match module 140 carries out impedance matching to special-shaped antenna group 150, by its frequency
For rate resonance to 13.56M, output impedance is converted into 50 Ω；
Radiofrequency signal is transferred to by open HF switch and completes matched special-shaped day by antenna match module 140
Line group 150, special-shaped antenna group 150 work and launch the space magnetic field of respective direction；
After special-shaped antenna group 150 completes the reading of its surrounding space magnetic field interior label, control signal control time division multiplexing
Module 130 switches to next HF switch conducting, keeps corresponding special-shaped antenna group 160 in running order, while special-shaped antenna
The matching module 140 of group 160 carries out impedance matching to special-shaped antenna group 160, extremely by the frequency resonance of special-shaped antenna group 160
13.56M, output impedance are converted into 50 Ω；
Radiofrequency signal is transferred to by open HF switch and completes matched special-shaped antenna group by matching module 140
160, special-shaped antenna group 160 works and launches the space magnetic field with the complementation of 150 direction of special-shaped antenna group, completes in channel range
The reading of three-dimensional label；
After the completion of special-shaped antenna group 160 is to the label detection in space, control signal control time division multiplexing module 130 switches
Corresponding HF switch conducting makes special-shaped antenna group 150 work, and poll repeats the above process successively.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of three-dimensional channel device of special-shaped antenna, which is characterized in that including：
Power module；
Frequency read/write, the input terminal of the frequency read/write connect the output end of the power module；
Be time-multiplexed module, and the input terminal of the time division multiplexing module connects the output end of the frequency read/write；And
Two special-shaped antenna groups, described two special-shaped antenna groups are all connected with the output end of the time division multiplexing module；
A magnetic direction including generation in described two special-shaped antenna groups is identical and has two parallel antennas of spacing
Frame, another includes that the magnetic direction that generates is opposite and two parallel antenna frames with spacing；
Wherein, the power module is used to provide power supply, the radio frequency read-write to the frequency read/write and time division multiplexing module
Device is used to generate the radiofrequency signal and the control signal for controlling the time division multiplexing module for carrying that label reads and operates, described
The module that is time-multiplexed is used for radio signal transmission under the action of the control signal to two special-shaped antenna groups, described two
Special-shaped antenna group be used for by radiofrequency signal send detection around RF tag and when detecting the RF tag it is anti-
Feedback signal is to the frequency read/write；
Described two special-shaped antenna groups time-sharing polling under the control signal works.
2. the three-dimensional channel device of special-shaped antenna according to claim 1, which is characterized in that the power module includes：
Conversion circuit can be the frequency read/write and the low-pressure direct that the module that is time-multiplexed provides for being converted to external power supply
Galvanic electricity.
3. the three-dimensional channel device of special-shaped antenna according to claim 1, which is characterized in that the frequency read/write packet
It includes：
Microcontroller chip；
The radio frequency transmitter circuitry being connect with the microcontroller chip；
The RF receiving circuit being connected with the microcontroller chip；And
The control circuit being connect with the microcontroller chip；
The radio frequency transmitter circuitry, which is used to generate, carries the radiofrequency signal that label reads and operates, and the RF receiving circuit is used
In the signal that the described two special-shaped antenna groups of reception are fed back when detecting RF tag, the microcontroller chip is used for described anti-
The signal of feedback is analyzed, and the control circuit is used to generate the control signal for controlling the time division multiplexing module.
4. the three-dimensional channel device of special-shaped antenna according to claim 3, which is characterized in that the time-sharing multiplex module packet
It includes：
Control switching circuit；And
The HF switch being connect respectively with described two special-shaped antenna groups；
The control switching circuit is used to drive the opening and closing of the HF switch under the action of control signal；
One input terminal being connect with the radio frequency transmitter circuitry of connection, the HF switch all have the HF switch jointly
One output end, and the HF switch is connected by the output end with the corresponding special-shaped antenna group；
Wherein, when the HF switch being driven to be closed under the action of the control signal when the control switching circuit, with institute
It states the special-shaped antenna group that HF switch is correspondingly connected with to start to work, the radiofrequency signal of generation is sent to by the radio frequency transmitter circuitry
The special-shaped antenna group；When the control switching circuit drives the HF switch to open under the action of the control signal
When, it is stopped the radiofrequency signal for generating the radio frequency transmitter circuitry with the special-shaped antenna group that the HF switch is correspondingly connected with
Keep apart with the special-shaped antenna group.
5. the three-dimensional channel device of special-shaped antenna according to claim 4, which is characterized in that the control signal is electric current
Signal, corresponding, the control switching circuit is current converter circuit, and the current converter circuit is by believing the electric current
Number be converted to the opening and closing that heavy current signal drives the HF switch.
6. the three-dimensional channel device of special-shaped antenna according to claim 4 or 5, which is characterized in that described two abnormity days
Line group is respectively connected with the antenna match module that impedance matching is carried out to the special-shaped antenna group, the input of the antenna match module
The output end of the corresponding HF switch of end connection, the output end of the antenna match module connect the special-shaped antenna group；
Wherein, it is described when the HF switch being driven to be closed under the action of the control signal when the control switching circuit
Antenna match module carries out impedance matching to the special-shaped antenna group, by the frequency resonance of the special-shaped antenna group to 13.56M,
Output impedance is converted into 50 Ω, meanwhile, the special-shaped antenna group is started to work, and the radio frequency transmitter circuitry believes the radio frequency of generation
Number it is sent to the special-shaped antenna group.
7. the three-dimensional channel device of special-shaped antenna according to claim 1, which is characterized in that the parallel antenna frame is ladder
Shape antenna frame.
8. the three-dimensional channel device of special-shaped antenna according to claim 7, which is characterized in that the echelon antenna frame is straight
Angle echelon antenna frame.
9. the three-dimensional channel device of special-shaped antenna according to claim 8, which is characterized in that the right-angled trapezium antenna frame
On-right angle base angle angle be 45 degree.
10. the three-dimensional channel device of special-shaped antenna according to claim 8 or claim 9, which is characterized in that described two abnormity days
The bevel edge of two right-angled trapezium antenna frames in line group, which is mutually aligned, to be placed in parallel, and described two right-angled trapezium antenna frames is oblique
Ratio between the length on the shorter bottom edge of the vertical range between side and any of which right-angled trapezium antenna frame is 1：5.
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| CN201510764315.8A CN105389605B (en) | 2015-11-10 | 2015-11-10 | The three-dimensional channel device of special-shaped antenna |
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| CN201510764315.8A CN105389605B (en) | 2015-11-10 | 2015-11-10 | The three-dimensional channel device of special-shaped antenna |
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| CN105389605B true CN105389605B (en) | 2018-07-31 |
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| CN109524798B (en) * | 2018-12-10 | 2021-06-29 | 深圳市金溢科技股份有限公司 | Path identification antenna, related device and related method |
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| JP2008167144A (en) * | 2006-12-28 | 2008-07-17 | Nec Tokin Corp | Antenna device |
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| CN103177272A (en) * | 2011-12-23 | 2013-06-26 | 广州安的电子科技有限公司 | Radio frequency identification (RFID) three-dimensional access door |
| CN103617407A (en) * | 2013-12-07 | 2014-03-05 | 威海北洋电气集团股份有限公司 | Double-wireframe-type dinner plate label reading device and method |
| CN103632177A (en) * | 2013-12-07 | 2014-03-12 | 威海北洋电气集团股份有限公司 | Double-line box three-dimensional channel device |
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