CN110137699A - A kind of UHF RFID reader antenna and switching method - Google Patents
A kind of UHF RFID reader antenna and switching method Download PDFInfo
- Publication number
- CN110137699A CN110137699A CN201910449809.5A CN201910449809A CN110137699A CN 110137699 A CN110137699 A CN 110137699A CN 201910449809 A CN201910449809 A CN 201910449809A CN 110137699 A CN110137699 A CN 110137699A
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- Prior art keywords
- antenna
- feeding network
- uhf rfid
- rfid reader
- direct
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0075—Stripline fed arrays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
- H01Q21/293—Combinations of different interacting antenna units for giving a desired directional characteristic one unit or more being an array of identical aerial elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
- H01Q3/247—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching by switching different parts of a primary active element
Abstract
The embodiment of the present invention provides a kind of UHF RFID reader antenna and switching method.The antenna includes: to be uniformly distributed N characteristic impedance transmission line identical with antenna feed impedance in the front of printed circuit board, respectively in M identical antenna oscillators of front setting of printed circuit board, in reverse side, N-M antenna oscillator is set, RF switch is set, positive M antenna oscillator and M transmission lines constitute M feeding network, the N-M antenna oscillator and N-M transmission lines of reverse side constitute N-M feeding network, and RF switch control switching antenna enters wherein one group of feeding network mode in N number of feeding network mode.The embodiment of the present invention, in the case where not increasing cost and system complexity, increases the recognition area coverage of near-field region while keeping UHF RFID recognition apart from remote feature.
Description
Technical field
The present embodiments relate to antenna technical fields, and in particular to a kind of UHF RFID (super high frequency radio frequency identification) reading
Device antenna and switching method.
Background technique
Radio frequency identification (Radio Frequency Identification, RFID) is that one kind is known automatically by radiofrequency signal
Other target object, and rapidly carry out the automatic identification technology of item tracing and data exchange.RFID technique without manual intervention,
Various adverse circumstances are operable with, can identify multiple labels simultaneously, it is swift and convenient to operate, it is widely used in warehouse logistics, figure
The fields such as book management, industrial production, traffic, clothes.
Fig. 1 is RFID system structural schematic diagram in the prior art, as shown in Figure 1, RFID system mainly consists of three parts:
Reader (Reader), label (Tag) and data processing system (Processor), reader include control module, radio-frequency module
With reader antenna (Reader Antenna)；Label includes label antenna and label chip.
Currently, RFID there are four working frequency range, is respectively: low frequency (LF:135KHz~134KHz), high frequency (HF:
13.56MHz), hyperfrequency (UHF:860~960MHz) and microwave band (2.4GHz and 5.8GHz).UHF RFID technique has
Read simultaneously multiple labels, can repeatedly read and write, data capacity is big, label is at low cost, small in size, easy to use, reliability and longevity
The features such as high is ordered, is had been widely used.
The label antenna of uhf band mostly uses greatly dipole antenna form, and polarization direction is linear polarization, each in order to distinguish
The label of polarization direction, traditional UHF reader antenna generally use circular polarized antenna, such as four arm spiral circular polarized antennas and micro-
Band circular polarized antenna etc., with high gain, recognition apart from it is remote the features such as, usually up to 10 meters.But it is in near-field region (30cm
Within) Energy distribution concentrates or uneven, it is small or there is recognition blind area to lead to distinguish overlay area, make uhf band near field or
It is restricted in the RFID application of the existing scene near field, far field.
Summary of the invention
For the defects in the prior art, the embodiment of the invention provides a kind of UHF RFID reader antenna and switching sides
Method.
In a first aspect, the embodiment of the present invention provides a kind of UHF RFID reader antenna, comprising: N transmission lines, N number of phase
Same antenna oscillator and RF switch；
The N transmission lines are distributed in printed circuit board front, and the characteristic impedance of every transmission lines is read with UHF RFID
The input impedance for reading device antenna is identical, wherein N is the integer greater than 1；
M antenna oscillator in N number of antenna oscillator is evenly distributed on printed circuit board front, the M antenna vibration
Son feed end be connected with one end of the M transmission lines in the N transmission lines, the ground terminal of the M antenna oscillator and
The printed circuit board is positive to be joined to form M feeding network with reference to ground terminal, and wherein M is the integer less than N；
Remaining N-M antenna oscillator in N number of antenna oscillator is evenly distributed on printed circuit board reverse side, it is described remaining
The feed end of N-M antenna oscillator is connected with one end of remaining N-M transmission lines in the N transmission lines, it is described remaining
The ground terminal of N-M antenna oscillator and the positive ground terminal that refers to of the printed circuit board are joined to form other N-M feedback
Electric network, wherein the M antenna oscillator and remaining described N-M antenna oscillator cross arrangement；
The RF switch is connected with the control module of the other end of the N transmission lines and UHF RFID reader respectively
It connects, the RF switch switches to N number of transmission network under the control of the control module, by the UHF RFID reader antenna
One of feeding network mode in network.
Such as above-mentioned antenna, optionally, the RF switch includes: rf inputs mouth, N number of radio frequency output port and P
Direct-flow input end mouth；
The rf inputs mouth is connected with the radio-frequency module of UHF RFID reader；
N number of radio frequency output port is connected with N number of feeding network respectively；
The P direct-flow input end mouth control with the DC power supply of the reader and the UHF RFID reader respectively
Molding block is connected, and the P direct-flow input end mouth is under the control of the control module, by direct current signal by the UHF
RFID reader antenna switches to one of feeding network mode in N number of feeding network；
Wherein, P=roundup (log2N), roundup is the function that rounds up.
Such as above-mentioned antenna, optionally, P direct-flow input end mouth in the RF switch passes through power supply and power-off switching shape
At N number of switching mode, N number of switching mode is under the control of the control module, by the UHF RFID reader antenna
Switch to one of feeding network mode in N number of feeding network.
Such as above-mentioned antenna, optionally, when the P direct-flow input end mouth powers off, the first feeding network is connected to；
First direct-flow input end confession electricity and remaining P-1 direct-flow input end mouth in the P direct-flow input end mouth
When powering off, the connection of the second feeding network；
When the P direct-flow input end mouth is powered, the connection of N feeding network.
Such as above-mentioned antenna, optionally, the transmission line is microstrip transmission line.
Such as above-mentioned antenna, optionally, N=2Q, Q are the integer greater than 1, and the M antenna oscillator is in the printing electricity
Road plate front is in rectangular arranged, remaining described N-M antenna oscillator is in rectangular arranged in the printed circuit board reverse side.
Such as above-mentioned antenna, optionally, N=8, M=4.
Second aspect, the embodiment of the present invention provide a kind of UHF RFID reader antenna switching method, are applied to institute as above
In the UHF RFID reader antenna stated, comprising:
When needing to read the data of label antenna, switches the RF switch by predeterminated frequency and be connected to N number of feedback
One of feeding network in electric network is to read the data of the label antenna.
Such as the above method, optionally, further includes:
If having read all data of the label antenna, stop switching.
UHF RFID reader antenna provided in an embodiment of the present invention and switching method, it is uniform in the front of printed circuit board
It is distributed N characteristic impedance transmission line identical with antenna feed impedance, it is identical in front setting M of printed circuit board respectively
Antenna oscillator is arranged N-M antenna oscillator in reverse side, RF switch, positive M antenna oscillator and M transmission lines structure is arranged
At M feeding network, the N-M antenna oscillator and N-M transmission lines of reverse side constitute N-M feeding network, RF switch control
Switch wherein one group of feeding network mode that antenna enters in N number of feeding network mode.The embodiment of the present invention is keeping UHF
While RFID recognition is apart from remote feature, in the case where not increasing cost and system complexity, near-field region is increased
Distinguish area coverage.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is RFID system structural schematic diagram in the prior art；
Fig. 2 is the pcb board positive structure schematic of UHF RFID reader antenna provided in an embodiment of the present invention；
Fig. 3 is the pcb board reverse structure schematic of UHF RFID reader antenna provided in an embodiment of the present invention；
Fig. 4 is the near field field distribution schematic diagram of the first feeding network provided in an embodiment of the present invention；
Fig. 5 is the near field field distribution schematic diagram of the second feeding network provided in an embodiment of the present invention；
Fig. 6 is the near field field distribution schematic diagram of third feeding network provided in an embodiment of the present invention；
Fig. 7 is the near field field distribution schematic diagram of the 4th feeding network provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In order to improve the near field area coverage of UHF RFID reader antenna, the embodiment of the present invention is taken in printed circuit board
Front (Top) arrangement N item (N can be for odd number, or the even numbers) characteristic of (Printed Circuit Board, PCB)
The impedance transmission line identical as reader antenna input impedance uniformly divides M antenna oscillator in N number of identical antenna oscillator
Remaining N-M antenna oscillator is evenly distributed on the reverse side (Bot) of PCB, set in the front or back of PCB by cloth in the front of PCB
Set RF switch, positive M antenna oscillator and M transmission lines form M feeding network, N-M antenna oscillator of reverse side with
N-M feeding network is formed positioned at positive N-M transmission lines, RF switch control switching antenna enters in N number of feeding network
One of feeding network mode.Since the near field overlay area of N group feeding network is different, pass through switched feed
Network mode improves the near field overlay area of UHF RFID antenna.
Below in conjunction with attached drawing, the technical scheme provided by various embodiments of the present application will be described in detail.
Fig. 2 is the pcb board positive structure schematic of UHF RFID reader antenna provided in an embodiment of the present invention, and Fig. 3 is
The pcb board reverse structure schematic of UHF RFID reader antenna provided in an embodiment of the present invention, as shown in Fig. 2 Fig. 3, UHF
RFID reader antenna includes:
N transmission lines, N number of identical antenna oscillator and RF switch；
The N transmission lines are distributed in printed circuit board front, and the characteristic impedance of every transmission lines is read with UHF RFID
The input impedance for reading device antenna is identical, wherein N is the integer greater than 1；
M antenna oscillator in N number of antenna oscillator is evenly distributed on printed circuit board front, the M antenna vibration
Son feed end be connected with one end of the M transmission lines in the N transmission lines, the ground terminal of the M antenna oscillator and
The printed circuit board is positive to be joined to form M feeding network with reference to ground terminal, and wherein M is the integer less than N；
Remaining N-M antenna oscillator in N number of antenna oscillator is evenly distributed on printed circuit board reverse side, it is described remaining
The feed end of N-M antenna oscillator is connected with one end of remaining N-M transmission lines in the N transmission lines, it is described remaining
The ground terminal of N-M antenna oscillator and the positive ground terminal that refers to of the printed circuit board are joined to form other N-M feedback
Electric network, wherein the M antenna oscillator and remaining described N-M antenna oscillator cross arrangement；
The RF switch is connected with the control module of the other end of the N transmission lines and UHF RFID reader respectively
It connects, the RF switch switches to N number of transmission network under the control of the control module, by the UHF RFID reader antenna
One of feeding network mode in network.
Specifically, as shown in Fig. 2, being uniformly distributed the vibration of M antenna in N number of identical antenna oscillator in the face Top of PCB
Son, these antenna oscillator include feed end and ground terminal, and the ground terminal of antenna oscillator is connected with the reference ground terminal in the face Top
It connects, can be taken with reference to ground terminal and cover copper realization in the face Top of PCB.N transmission lines are additionally provided in the face Top of PCB, every
The characteristic impedance of transmission line and the input impedance of reader antenna are identical, realize that energy maximizes transmission with this, for example, if antenna
Input impedance be 50 ohm, then be arranged every transmission lines characteristic impedance be 50 ohm.The feed end difference of M antenna oscillator
It is connected with one end of M transmission lines, the other end of transmission line is connected with the RF switch for being located at the front PCB or PCB reverse side,
M antenna oscillator and the equally distributed transmission line of M item are in M feeding network of the front PCB formation.
It is similar, as shown in figure 3, it is identical as antenna feed impedance to be uniformly distributed N number of characteristic impedance in the face Top of PCB
Transmission line (being represented by dotted lines in the face Bot), be uniformly distributed N-M antenna oscillator, these antenna oscillator in the face Bot of PCB
It include feed end and ground terminal, the reference ground terminal in the face ground terminal Bop of antenna oscillator is connected, can adopt with reference to ground terminal
It takes and covers copper realization in the face Bot of PCB.The feed end of antenna oscillator passes through one end of the remaining N-M transmission lines in PCB and the face Top
It is connected, the other end of transmission line is connected with the RF switch for being located at the front PCB or PCB reverse side, N-M antenna oscillator and N-
The equally distributed transmission line of M item forms N-M feeding network in the front PCB.It is worth noting that, the day in N group feeding network
Linear oscillator cross arrangement.
The switching of N group feeding network is controlled in the embodiment of the present invention by RF switch, RF switch can be both arranged in
The front PCB can also be arranged in PCB reverse side, and it is not limited in the embodiment of the present invention.RF switch respectively with N transmission lines
The other end is connected with the control module (having shown that in Fig. 1) of UHF RFID reader, when control module control RF switch connects
When leading to a certain transmission lines, the feeding network where the transmission line is connected to, and reader antenna is in the feeding network mode, due to
Reader antenna has N number of feeding network, and this N number of feeding network is evenly distributed on the obverse and reverse of PCB, each transmission network
The strong region in the near field of network is different, therefore by the switching of N group feeding mode, can be improved the near-field region of reader antenna
Distinguish area coverage.UHF RFID reader antenna provided in an embodiment of the present invention is in holding UHF RFID recognition apart from remote spy
While point, in the case where not increasing cost and system complexity, recognition area coverage and the near field of near-field region are increased
Field strength distribution intensity.
On the basis of the above embodiments, further, the RF switch includes: that rf inputs mouth, N number of radio frequency are defeated
Exit port and P direct-flow input end mouth；
The rf inputs mouth is connected with the radio-frequency module of UHF RFID reader；
N number of radio frequency output port is connected with N number of feeding network respectively；
The P direct-flow input end mouth control with the DC power supply of the reader and the UHF RFID reader respectively
Molding block is connected, and the P direct-flow input end mouth is under the control of the control module, by direct current signal by the UHF
RFID reader antenna switches to one of feeding network mode in N number of feeding network；
Wherein, P=roundup (log2N), roundup is the function that rounds up.
P direct-flow input end mouth in the RF switch forms N number of switching mode by power supply and power-off switching, described
N number of switching mode switches to N number of feeding network under the control of the control module, by the UHF RFID reader antenna
In one of feeding network mode.
When the P direct-flow input end mouth powers off, the connection of the first feeding network；
First direct-flow input end confession electricity and remaining P-1 direct-flow input end mouth in the P direct-flow input end mouth
When powering off, the connection of the second feeding network；
When the P direct-flow input end mouth is powered, the connection of N feeding network.
Specifically, RF switch includes 1 rf inputs mouth, N number of radio frequency output port and P direct-flow input end mouth,
Wherein P=roundup (log2N), roundup is the function that rounds up.For example, 8 antenna oscillators, then be arranged RF switch packet
3 direct-flow input end mouths are included, 9 antenna oscillators, then it includes 4 direct-flow input end mouths that RF switch, which is arranged,.1 of RF switch
Rf inputs mouth is connected by coaxial feeder with the radio-frequency module (having shown that in Fig. 1) of reader, N number of radio frequency of RF switch
Output port RF1 to RFN is connect with 8 transmission lines respectively, P direct-flow input end mouth V1 to VP of RF switch respectively with reading
The DC power supply of device is connected with the control module of reader, and control module can control direct-flow input end mouth, and whether there is or not direct current letters
Number, P direct-flow input end mouth can form 2 by power supply and power-offPA switching mode is N number of so as to be controlled by direct current signal
The switching of feeding network.When P direct-flow input end mouth powers off, the connection of the first feeding network；When in P direct-flow input end mouth
First direct-flow input end confession electricity and remaining P-1 direct-flow input end mouth when powering off, the second feeding network is connected to, with this
Analogize, when P direct-flow input end mouth is powered, the connection of N feeding network.
For example, the rf inputs mouth of RF switch passes through the prevention at radio-frequency port phase of coaxial feeder and reader as N=8
Even；Eight radio frequency output port RF1 to RF8 of RF switch are connect with 8 transmission lines respectively, three DC terminals of RF switch
Mouth V1, V2 and V3 are connected with DC power supply and control module, when control module control V1, V2 and V3 do not power, RF1 connection,
RF2 to RF8 is disconnected, formation mode 1 (0,0,0), and antenna oscillator 1 works, and first group of feeding network is in running order；V1 is supplied
When electricity, V2 and V3 do not power, RF2 connection, RF1, RF3 to RF8 are disconnected, and formation mode 2 (0,0,1), antenna oscillator 2 works, the
Two groups of feeding networks are in running order；And so on, when V1, V2 and V3 power, RF8 connection, RF1 to RF7 is disconnected, and is formed
Mode 8 (1,1,1), antenna oscillator 8 work, and the 8th group of feeding network is in running order.
On the basis of the various embodiments described above, further, the transmission line is microstrip transmission line.
Further, N=2Q, Q are the integer greater than 1, and the M antenna oscillator is in the printed circuit board front
Rectangular arranged, remaining described N-M antenna oscillator are in rectangular arranged in the printed circuit board reverse side.Preferably, N=8, M=
4。
Specifically, N transmission lines can be formed by microstrip transmission line, microstrip transmission line is by propping up on dielectric substrate
The microwave transmission line that plain conductor band is constituted, adjust microstrip transmission line length can be realized the characteristic impedance of microstrip transmission line with
Antenna feed impedance is identical.Further, in order to improve near-field region area coverage, even numbers antenna oscillator, example can be set
Such as, 8 antenna oscillators are set, and the front PCB and PCB reverse side are evenly arranged 4 antenna oscillators, this 4 antenna oscillators are the 4 of PCB
A rectangular arrangement in angle.4 antenna oscillators are in the front PCB, the biography that feed end is directly 50 ohm with the characteristic impedance in the face Top
Defeated line is connected, and ground terminal is connected with the face Top with reference to ground terminal；Another 4 oscillators are in PCB reverse side, and feed end passes through PCB and Top
The transmission line that the characteristic impedance in face is 50 ohm is connected, and ground terminal is connected with the face Bot.When RF switch is in mode 1 (0,0,0)
When, antenna oscillator 1 is in running order；When RF switch is in mode 2 (0,0,1), antenna oscillator 2 is in running order；
When RF switch is in mode 3 (0,1,0), antenna oscillator 3 is in running order；When RF switch is in mode 4 (0,1,1)
When, antenna oscillator 4 is in running order；When RF switch is in mode 5 (1,0,0), antenna oscillator 5 is in running order；
When RF switch is in mode 6 (1,0,1), antenna oscillator 6 is in running order；When RF switch is in mode 7 (1,1,0)
When, antenna vibration 7 is in running order；When RF switch is in mode 8 (1,1,1), antenna oscillator 8 is in running order.
Fig. 4-Fig. 7 is that the near field field distribution of the first feeding network to the 4th feeding network provided in an embodiment of the present invention is shown
It is intended to, as shown in Figure 4-Figure 7, gray scale is deeper, and it indicates that electric field is stronger, can visually see, the first feeding network to the 4th feedback
The strong region in the near field of electric network is different, to increase the near field overlay area of UHF RFID reader antenna.
UHF RFID reader antenna provided in an embodiment of the present invention is keeping UHF RFID to distinguish apart from remote feature
Meanwhile in the case where not increasing cost and system complexity, the recognition area coverage and near-field field strength of near-field region are increased
Distribution intensity.
Based on above-mentioned UHF RFID reader antenna, the embodiment of the present invention also provides a kind of UHF RFID reader antenna and cuts
Change method, comprising:
When needing to read the data of label antenna, switches the RF switch by predeterminated frequency and be connected to N number of feedback
One of feeding network in electric network is to read the data of the label antenna.
If having read all data of the label antenna, stop switching.
Specifically, since UHF RFID reader antenna has N group feeding network, when needing to read label antenna
Data when, RF switch can be controlled by control module and switch different feeding networks and enter working condition, for example, can be with
Switch RF switch by predeterminated frequency so that the first feeding network to N feeding network by predeterminated frequency switching, when having read
When getting all data of label antenna, then stop switching.Wherein, the switching method of feeding network is in above-mentioned apparatus embodiment
It has been illustrated that, details are not described herein again.UHF RFID reader antenna switching method provided in an embodiment of the present invention, by switching N
Group feeding network, while keeping UHF RFID recognition apart from remote feature, in the feelings for not increasing cost and system complexity
Under condition, the recognition area coverage of near-field region is increased.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can store in computer-readable storage medium, which exists
When execution, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes: ROM, RAM, magnetic or disk
Etc. the various media that can store program code.
The embodiments such as device described above are only schematical, wherein the unit as illustrated by the separation member
It may or may not be physically separated, component shown as a unit may or may not be physics list
Member, it can it is in one place, or may be distributed over multiple network units.It can be selected according to the actual needs
In some or all of the modules achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness
Labour in the case where, it can understand and implement.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the embodiment of the present invention, rather than it is right
It is limited；Although the embodiment of the present invention is described in detail referring to foregoing embodiments, the ordinary skill of this field
Personnel are it is understood that it is still possible to modify the technical solutions described in the foregoing embodiments, or to part
Or all technical features are equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution
The range of various embodiments of the present invention technical solution.
Claims (9)
1. a kind of UHF RFID reader antenna characterized by comprising N transmission lines, N number of identical antenna oscillator and penetrate
Frequency switchs；
The N transmission lines are distributed in printed circuit board front, and the characteristic impedance of every transmission lines and UHF RFID reader
The input impedance of antenna is identical, wherein N is the integer greater than 1；
M antenna oscillator in N number of antenna oscillator is evenly distributed on printed circuit board front, the M antenna oscillator
Feed end is connected with one end of the M transmission lines in the N transmission lines, the ground terminal of the M antenna oscillator with it is described
Printed circuit board is positive to be joined to form M feeding network with reference to ground terminal, and wherein M is the integer less than N；
Remaining N-M antenna oscillator in N number of antenna oscillator is evenly distributed on printed circuit board reverse side, remaining described N-M
The feed end of a antenna oscillator is connected with one end of remaining N-M transmission lines in the N transmission lines, remaining described N-M
The ground terminal of a antenna oscillator and the positive ground terminal that refers to of the printed circuit board are joined to form other N-M transmission network
Network, wherein the M antenna oscillator and remaining described N-M antenna oscillator cross arrangement；
The RF switch is connected with the control module of the other end of the N transmission lines and UHF RFID reader respectively,
The RF switch switches to N number of feeding network under the control of the control module, by the UHF RFID reader antenna
In one of feeding network mode.
2. antenna according to claim 1, which is characterized in that the RF switch includes: rf inputs mouth, N number of penetrates
Frequency output port and P direct-flow input end mouth；
The rf inputs mouth is connected with the radio-frequency module of UHF RFID reader；
N number of radio frequency output port is connected with N number of feeding network respectively；
The P direct-flow input end mouth control mould with the DC power supply of the reader and the UHF RFID reader respectively
Block is connected, and the P direct-flow input end mouth is under the control of the control module, by direct current signal by the UHF RFID
Reader antenna switches to one of feeding network mode in N number of feeding network；
Wherein, P=roundup (log2N), roundup is the function that rounds up.
3. antenna according to claim 2, which is characterized in that P direct-flow input end mouth in the RF switch passes through
Power supply forms N number of switching mode with power-off switching, and N number of switching mode is under the control of the control module, by the UHF
RFID reader antenna switches to one of feeding network mode in N number of feeding network.
4. antenna according to claim 3, which is characterized in that when the P direct-flow input end mouth powers off, the first feed
Network-in-dialing；
First direct-flow input end confession electricity and remaining P-1 direct-flow input end mouth in the P direct-flow input end mouth is disconnected
When electric, the connection of the second feeding network；
When the P direct-flow input end mouth is powered, the connection of N feeding network.
5. antenna according to claim 1 to 4, which is characterized in that the transmission line is microstrip transmission line.
6. antenna according to claim 5, which is characterized in that N=2Q, Q are the integer greater than 1, and the M antenna shakes
Son is in rectangular arranged in the printed circuit board front, remaining described N-M antenna oscillator is in the printed circuit board reverse side
Rectangular arranged.
7. antenna according to claim 6, which is characterized in that N=8, M=4.
8. a kind of UHF RFID reader antenna switching method, which is characterized in that be applied to as claimed in claim 1 to 7
In UHF RFID reader antenna, comprising:
When needing to read the data of label antenna, switches the RF switch by predeterminated frequency and be connected to N number of transmission network
One of feeding network in network is to read the data of the label antenna.
9. according to the method described in claim 8, it is characterized by further comprising:
If having read all data of the label antenna, stop switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910449809.5A CN110137699B (en) | 2019-05-28 | 2019-05-28 | UHF RFID reader antenna and switching method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910449809.5A CN110137699B (en) | 2019-05-28 | 2019-05-28 | UHF RFID reader antenna and switching method |
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| Publication Number | Publication Date |
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| CN110137699A true CN110137699A (en) | 2019-08-16 |
| CN110137699B CN110137699B (en) | 2021-01-05 |
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| CN201910449809.5A Active CN110137699B (en) | 2019-05-28 | 2019-05-28 | UHF RFID reader antenna and switching method |
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