CN104779448B - A kind of RFID identification antenna based on RF MEMS phase shifters - Google Patents
A kind of RFID identification antenna based on RF MEMS phase shifters Download PDFInfo
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- CN104779448B CN104779448B CN201510165999.XA CN201510165999A CN104779448B CN 104779448 B CN104779448 B CN 104779448B CN 201510165999 A CN201510165999 A CN 201510165999A CN 104779448 B CN104779448 B CN 104779448B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 239000000523 sample Substances 0.000 claims abstract description 7
- 239000003989 dielectric material Substances 0.000 claims abstract description 4
- 230000005855 radiation Effects 0.000 claims description 7
- 230000010287 polarization Effects 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 206010003084 Areflexia Diseases 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The present invention relates to a kind of identification antenna based on RF MEMS phase shifters, the antenna includes five-layer structure, and bottom is feeding network, and the transmission network network layers include power splitter, RF MEMS phase shifters；Intermediate layer includes reference ground；The upper and lower in intermediate layer include two layers of dielectric material for being used to isolate respectively；The superiors include bay；The antenna also includes feed probes, and the feeding network is connected with the bay using back of the body feedback form, and the feeding network is fed by the feed probes to the bay.
Description
Technical field
The present invention relates to radio frequency electric technical field, antenna applications field more particularly in RFID system.
Background technology
RFID technique is to realize the key technology of Internet of Things, in RFID system, according to different application scenarios, it is necessary to make
Radiofrequency signal is sent and received with the antenna in RFID system, in actual applications, to improve system operating efficiency, is needed often
Realize to electronic tag multi-angle, remote reading.Antenna array carries out each unit radiation field vector on some directions in space
In-phase stacking, and reversely offset on other directions, therefore antenna array can be used for realizing high-gain and beam position control
System.Want to realize the scanning of antenna beam multi-angle, it is necessary to add phase shifter in aerial array feeding network.MEMS phase shift utensils
Have the advantages that insertion loss is small, low in energy consumption, volume and the loss of whole radio system can be reduced.MEMS phase shifters can typically divide
For distributed phase shifters, reflection-type phase shifter and switching wiring phase shifter.Switching wiring phase shifter is controlled micro- using mems switch
Ripple signal is from the different transmission line of two electrical length by different phase states being obtained, by multiple One-position switch phase shifter levels
Connection, may make up multi-position switch linear phase shifter.
In RFID system, due to not fixing for label putting position, it is circular polarized antenna typically to require reading and writing device antenna,
And linear polarized antenna is then applied in the read write line of orientation reading electronic labels.In RFID fields, circular polarized antenna has
Important application, it has also become current domestic and international study hotspot.Any polarized wave can be decomposed into two oppositely oriented circular polarisation
Ripple.Wherein, a line polarization wave can be decomposed into the circularly polarised wave that two oppositely oriented, amplitude is equal.Therefore, arbitrarily polarize
Incoming wave can all be received by circular polarized antenna；Conversely, the circularly polarised wave of circular polarized antenna radiation can also be by the antenna that arbitrarily polarizes
Receive.So circular polarized antenna is widely used in RFID system.
The content of the invention
To meet actual techniques demand at this stage, present invention aims at provide a kind of identification based on RFMEMS phase shifters
Antenna.
The purpose of the present invention is mainly achieved through the following technical solutions：
A kind of identification antenna based on RF MEMS phase shifters, it is characterised in that the antenna includes five-layer structure, bottom
For feeding network (e), the transmission network network layers include power splitter (5), RF MEMS phase shifters (3)；Intermediate layer includes reference ground
(6)；The upper and lower in intermediate layer include two layers of dielectric material for being used to isolate respectively；The superiors include bay (1)；Institute
Stating antenna also includes feed probes (2), and the feeding network is connected with the bay using back of the body feedback form, the transmission network
Network is fed by the feed probes to the bay.
Preferably, connected between the power splitter and the RF MEMS phase shifters using microstrip line.
Preferably, the power splitter is Wilkinson power divider, realize constant amplitude with after phase power distribution with the RF MEMS
Phase shifter connects.
Preferably, the RF MEMS phase shifters include switching wiring phase shifter, and the switching wiring phase shifter includes two
RF MEMS single-pole double-throw switch (SPDT)s, each RF MEMS single-pole double-throw switch (SPDT)s both ends are respectively connecting to two voltage signal control lines,
The conducting of RF MEMS single-pole double-throw switch (SPDT) homonymies branch road is controlled during the voltage signal control line conducting, controls each RF MEMS mono-
One of two voltage signal control lines of double-pole double throw switch simultaneously turn on so that by phase shifter signal produce 0 degree, 45 degree,
90 degree, or 135 degree of phase offset.
Preferably, the bay is the metal patch of fluting in the middle part of square four side, the part in the side of square patch four
Two pairs of grooves that length does not wait are not opened, and use coaxial feed along paster diagonal, form circular polarization radiation.
Preferably, the size and number of the bay are adjusted, make the Antenna Operation in hyper band or microwave
Frequency range.
Preferably, the Wilkinson power divider both arms length is quarter-wave, and branch's micro-strip line impedance is 70.7
Ohm, the isolation resistance between both arms is 100 Europe.
Preferably, the distance between adjacent array element determines according to below equation in the bay：
Wherein d is the distance between array element, θmaxFor wave beam maximum scan angle, λ representation signal operation wavelengths.
Preferably, the distance between adjacent array element is the half of signal operation wavelength in the bay.
Preferably, the antenna is used for RFID fields.
The present invention has the beneficial effect that：The identification antenna of the present invention has remote, large-scale recognition performance, if should
For RFID fields, it is possible to increase when identifying at a distance, the accuracy and convenience of RFID identification.Particularly, spy of the invention
Determining RF MEMS phase shifters has the advantages that insertion loss is small, low in energy consumption, can reduce volume, the loss of whole RFID system antenna
And power consumption；In addition, distinctive circular polarization antenna array tuple can improve antenna beam multi-angle and scan, be remote into aerial array
Identify the efficiency and accuracy rate of target.
Other features and advantages of the present invention will illustrate in the following description, also, partial become from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by the explanations write
Specifically noted structure is realized and obtained in book, claims and accompanying drawing.
Brief description of the drawings
Accompanying drawing is only used for showing the purpose of specific embodiment, and is not considered as limitation of the present invention, in whole accompanying drawing
In, identical reference symbol represents identical part.
Fig. 1 is the antenna structure top view of the present invention；
Fig. 2 is the antenna structure side view of the present invention；
Fig. 3 is the feeding network schematic diagram of the specific embodiment one of the present invention；
Fig. 4 is the bay distribution schematic diagram of the present invention；
Fig. 5 is the phase shifter schematic diagram of the present invention；
Fig. 6 is the bay schematic diagram of the present invention；
Fig. 7 is the power splitter schematic diagram of the present invention；
Fig. 8 is the feeding network schematic diagram of the specific embodiment two of the present invention；
Fig. 9 is the feeding network schematic diagram of the specific embodiment three of the present invention.
Embodiment
The preferred embodiments of the present invention are specifically described below in conjunction with the accompanying drawings, wherein, accompanying drawing forms the application part, and
It is used for the principle for explaining the present invention together with embodiments of the present invention.
Fig. 1 is the first embodiment of the present invention.As shown in figure 1, the RFID identification based on RF MEMS phase shifters of the present invention
Antenna includes power splitter 5, phase shifter 3, RF mems switches 4, switch signal line 7, bay 1, feed probes 2, reference ground
Face 6, dielectric material b.
As shown in Fig. 2 the RFID identification antenna based on RF MEMS phase shifters of the present invention includes five-layer structure, the superiors a
Be antenna radiation unit, be made of copper sheet, be dielectric layer to next layer of b, use dielectric constant for 4.4 FR4 epoxy resin
Plate, loss angle tangent 0.02, one layer is ground plane c still further below, and one layer is underlying dielectric layers d still further below, and bottom one layer is
Transmission network network layers e.
As shown in figure 3, the feeding network figure of the present invention is made up of Wilkinson power divider and RF MEMS phase shifters, by three
Individual Wilkinson power divider and two RF MEMS two-position switch linear phase shifters are formed, and a two-position switch linear phase shifter makes
With four single-pole double throw RF mems switches.Power splitter includes two output ends, an input.The antenna includes four antennas
Array element (A1, A2, A3, A4), two phase shifters (101,102) and three power splitters (001,002,003).First power splitter
(001) input (In) is connected with external signal, and two output ends connect the first phase shifter (101) and the second phase shifter respectively
(102) output end of input, the first phase shifter (101) and the second phase shifter (102) respectively with the second power splitter (002) and
The input connection of 3rd power splitter (003), the output end of the second power splitter respectively with first antenna array element and the second antenna array
Member is connected, and the 3rd power splitter is connected with third antenna array element and the 4th bay respectively.
Wilkinson power divider could alternatively be T-shaped power splitter or other power splitters.
One Wilkinson power divider structure chart is as shown in Figure 7.The function of Wilkinson power divider is by input signal etc.
Divide or be not assigned to each output port partially, and keep identical output phase.The characteristic of each port of power splitter is：Port
In areflexias, port Out1 and Out2 output voltage is equal and same phase, and port Out1 and Out2 power output ratio is any finger
Definite value 1/k2(k is real number), it can be obtained by transmission line impedance transformation theory correlation formula,
In the present invention, power splitter can use
Constant power distributes, and unequal power can also be used to distribute in multipath power distributor structure.Worked by Wilkinson power divider
Principle understands that when input characteristic impedance is 50 ohm, power splitter both arms length is quarter-wave, quarter-wave
Branch's micro-strip line impedance is 70.7 ohm, and the isolation resistance between both arms is：
Fig. 5 is switching wiring phase shifter, and the switching wiring phase shifter is formed by two RF MEMS phase shifter cascades,
First phase shifter realizes 90 degree of phase offsets, and second phase shifter realizes 45 degree of phase offset, each RF MEMS hilted broadsword
The external two voltage control signal lines of commutator, for controlling the different paths of microwave signal.The RF MEMS phase shifters can be real
Existing 0 degree, 45 degree, 90 degree, 135 degree of phase offsets, when n and q control signals controlling brancher 10 and 20 turns on, realize 0 degree of phase
Skew, when m controlling branchers 11 turn on, q controlling branchers 20 are turned on, and realize 45 degree of phase offsets, and when n controlling branchers 10 turn on, p is controlled
Branch road 21 processed turns on, and 90 degree of phase offsets can be achieved, and when m controlling branchers 11 turn on, p controlling branchers 21 turn on, and can be achieved 135 degree
Phase offset.
MEMS phase shifters can also be distributed phase shifters, reflection-type phase shift in addition to it can be switching mode phase shifter
Device etc..
As shown in figure 4, bay is made up of four circular polarization microstrip antennas, in order to realize array element Miniaturization Design,
Radiating antenna surface is slotted, as shown in fig. 6, open two pairs of grooves that length does not wait respectively in the middle part of the side of square patch four, array element feed
Point is in the clinodiagonal of square-shaped radiation surface, using coaxial feed technology so that aerial radiation circularly polarised wave.In aerial array
In, in order to occur without graing lobe, the distance of adjacent array element is
Fig. 8 is the second embodiment of the present invention.The feeding network figure of the embodiment is by a Wilkinson work(point
Device and two RF MEMS phase shifters, and two bays are formed.The input of power splitter is connected with external signal, two
Output end connects the output end point of the input of the first phase shifter and the second phase shifter, the first phase shifter and the second phase shifter respectively
It is not connected with first antenna array element and the second bay.
Fig. 9 is the third embodiment of the present invention.The feeding network figure of the embodiment is by seven Wilkinson power dividers and four
Individual RF MEMS phase shifters, and eight bays are formed.The composition is connected respectively by two output ends of a power splitter
What feeding network as shown in Figure 1 was formed.
The bay of the present invention is not limited only to certain combination, and element number of array can determine according to actual gain demand, root
According to the number of array element, power splitter and phase shifter are selected, basic principle is that power splitter realizes power distribution, reconnects phase shifter, most
Realize that the output port number of feeding network is equal with array number eventually, all array elements receive constant-amplitude signal, the array element of arranged adjacent
Between produce phase difference.Array element arrangement principle is that feeding network output port is corresponding with array element, and phase difference is produced between adjacent array element,
Realize beam scanning.The bay of the invention is only limitted to form shown in Fig. 6 incessantly, also can be replaced other and meets band requirement
RFID antenna array element.
In summary, the embodiments of the invention provide a kind of identification antenna of the invention to have remote, knowledge on a large scale
Other performance, if being applied to RFID fields, it is possible to increase when identifying at a distance, the accuracy and convenience of RFID identification.Especially
It is that specific RF MEMS phase shifters of the invention have the advantages that insertion loss is small, low in energy consumption, can reduce whole RFID system day
Volume, loss and the power consumption of line；In addition, it is polygonal can to improve antenna beam into aerial array for distinctive circular polarization antenna array tuple
Degree scanning, the efficiency and accuracy rate of remote identification target.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.
Claims (7)
1. a kind of identification antenna based on RF MEMS phase shifters, it is characterised in that the antenna includes five-layer structure, and bottom is
Feeding network (e), the transmission network network layers include power splitter (5), RF MEMS phase shifters (3)；Intermediate layer includes reference ground
(6)；The upper and lower in intermediate layer include two layers of dielectric material for being used to isolate respectively；The superiors include bay (1)；Institute
Stating antenna also includes feed probes (2), and the feeding network is connected with the bay using back of the body feedback form, the transmission network
Network is fed by the feed probes to the bay；
Connected between the power splitter and the RF MEMS phase shifters using microstrip line；
The bay is the metal patch of fluting in the middle part of square four side, and length is opened respectively in the middle part of the side of square patch four
Two pairs of grooves, and use coaxial feed along paster diagonal, form circular polarization radiation；
The distance between adjacent array element is the half of signal operation wavelength in the bay.
A kind of 2. identification antenna based on RF MEMS phase shifters according to claim 1, it is characterised in that the work(point
Device is Wilkinson power divider, realizes that constant amplitude is connected with after phase power distribution with the RF MEMS phase shifters.
A kind of 3. identification antenna based on RF MEMS phase shifters according to claim 2, it is characterised in that the RF
MEMS phase shifters include switching wiring phase shifter, and the switching wiring phase shifter includes two RF MEMS single-pole double-throw switch (SPDT)s, often
Individual RF MEMS single-pole double-throw switch (SPDT)s both ends are respectively connecting to two voltage signal control lines, the voltage signal control line conducting
When control the conducting of RF MEMS single-pole double-throw switch (SPDT) homonymies branch roads, control two voltages of each RF MEMS single-pole double-throw switch (SPDT)s to believe
One of number control line simultaneously turns on so that produce 0 degree by the signal of phase shifter, 45 degree, and 90 degree, or 135 degree of phase offset.
4. a kind of identification antenna based on RF MEMS phase shifters according to any one of claims 1 to 3, it is characterised in that adjust
The size and number of the whole bay, make the Antenna Operation in hyper band or microwave frequency band.
A kind of 5. identification antenna based on RF MEMS phase shifters according to claim 2, it is characterised in that the Weir
The gloomy power splitter both arms length of gold is quarter-wave, and branch's micro-strip line impedance is 70.7 ohm, and the isolation resistance between both arms is
100 Europe.
A kind of 6. identification antenna based on RF MEMS phase shifters according to claim 1, it is characterised in that the antenna
The distance between adjacent array element determines according to below equation in array element：
<mrow>
<mi>d</mi>
<mo><</mo>
<mfrac>
<mi>&lambda;</mi>
<mrow>
<mo>|</mo>
<mn>1</mn>
<mo>+</mo>
<msub>
<mi>sin&theta;</mi>
<mi>max</mi>
</msub>
<mo>|</mo>
</mrow>
</mfrac>
</mrow>
Wherein d is the distance between array element, θmaxFor wave beam maximum scan angle, λ representation signal operation wavelengths.
A kind of 7. identification antenna based on RF MEMS phase shifters according to claim 1, it is characterised in that the antenna
For RFID fields.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510165999.XA CN104779448B (en) | 2015-04-09 | 2015-04-09 | A kind of RFID identification antenna based on RF MEMS phase shifters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510165999.XA CN104779448B (en) | 2015-04-09 | 2015-04-09 | A kind of RFID identification antenna based on RF MEMS phase shifters |
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| CN104779448A CN104779448A (en) | 2015-07-15 |
| CN104779448B true CN104779448B (en) | 2017-11-14 |
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| CN106935982B (en) * | 2015-12-31 | 2020-09-25 | 航天信息股份有限公司 | Planar array antenna |
| CN106033846A (en) * | 2016-06-30 | 2016-10-19 | 浙江大学 | Polarization switching surface based on sub-wavelength harmonic structure |
| CN106771628B (en) * | 2016-12-13 | 2019-11-15 | 环旭电子股份有限公司 | Load testing device and load test approach |
| CN106505315A (en) * | 2016-12-27 | 2017-03-15 | 广东工业大学 | A kind of compact directional array antenna |
| CN108321491B (en) * | 2018-01-04 | 2019-12-20 | 苏州大学 | Switchable near-far field radio frequency identification antenna |
| CN108648963B (en) * | 2018-05-25 | 2019-11-08 | 北京邮电大学 | A kind of RF-MEMS single-pole double-throw switch (SPDT) and micro-strip antenna array |
| CN109066106A (en) * | 2018-08-31 | 2018-12-21 | 福州福大信捷天线技术有限公司 | A kind of RFID radio frequency identification combined antenna |
| CN109273842A (en) * | 2018-09-17 | 2019-01-25 | 清华大学 | The phased array antenna unit of the MEMS phase shifter of back-to-back multilayer lamination structure |
| CN110233327B (en) * | 2019-05-28 | 2021-01-15 | 北京星网锐捷网络技术有限公司 | UHF RFID reader antenna and switching method |
| CN110137699B (en) * | 2019-05-28 | 2021-01-05 | 北京星网锐捷网络技术有限公司 | UHF RFID reader antenna and switching method |
| RU2751090C1 (en) * | 2020-03-18 | 2021-07-08 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Поволжский государственный университет телекоммуникаций и информатики" | Method for retaining the directivity of the uhf radio frequency identification tag during operation under a complex interference pattern |
| CN114976556B (en) * | 2022-05-23 | 2024-06-25 | 赛莱克斯微***科技（北京）有限公司 | MEMS micro coaxial power divider |
| CN115207619B (en) * | 2022-07-25 | 2023-04-28 | 中国电子科技集团公司第五十四研究所 | Terahertz wave band directional diagram reconfigurable antenna |
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