CN108776829A - Medical detection ultra-high frequency RFID label - Google Patents
Medical detection ultra-high frequency RFID label Download PDFInfo
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- CN108776829A CN108776829A CN201810619411.7A CN201810619411A CN108776829A CN 108776829 A CN108776829 A CN 108776829A CN 201810619411 A CN201810619411 A CN 201810619411A CN 108776829 A CN108776829 A CN 108776829A
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- Prior art keywords
- adhesive tape
- slot
- antenna
- copper adhesive
- label
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/063—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code the carrier being marginally punched or notched, e.g. having elongated slots
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07758—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag
- G06K19/07762—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag the adhering arrangement making the record carrier wearable, e.g. having the form of a ring, watch, glove or bracelet
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
- G06K19/07786—Antenna details the antenna being of the HF type, such as a dipole
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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
- H01Q1/2225—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 active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Networks & Wireless Communication (AREA)
- Details Of Aerials (AREA)
Abstract
The present invention is telemedicine monitoring system ultra-high frequency RFID label, including medium substrate, slotted patch antenna, flexible dielectric substrate, label chip, left side viscosity copper adhesive tape, right side viscosity copper adhesive tape, metal, upside T-slot, downside T-slot, left side microstrip feed line, right side microstrip feed line；The both ends of label chip are respectively welded at two open circuit end positions of left side microstrip feed line and right side microstrip feed line, left side viscosity copper adhesive tape and right side viscosity copper adhesive tape are respectively adhered on the left and right sides of flexible dielectric substrate upper surface, the both ends of left side viscosity copper adhesive tape are connected with the left end short circuit of the left end of slotted patch antenna, metal ground respectively, the both ends of right side viscosity copper adhesive tape are connected with the right end short circuit of the right end of slotted patch antenna, metal ground respectively, are formed in flexible dielectric substrate lower surface by rectangular adhesive's copper tape-stripping to metal.
Description
Technical field
The present invention relates to the technical fields of communication antenna and wearable device, specifically, it shows a kind of tele-medicine
Monitor system ultra-high frequency RFID label.
Background technology
Telemedicine monitoring system has developed into global discussion topic and research hotspot in recent years, and as height
One of the most important business that degree developed countries and regions face, still, there are no quilts completely for the remote monitoring system of many countries
It developed.Therefore, a excellent RFID tracking systems are designed, for example are worn on the flexible RFID label in wrist to patient
It is necessary.The RFID tag of human body wearing, it is necessary to be bent and the body effect that human body itself is brought can be born
It answers, this is because the dielectric constant of inside of human body is extremely complex, such as skin, fat, muscle and bone etc., these people
Body tissue can absorb or mitigate the electromagnetic wave of RFID tag transmitting/receiving.In addition, wearable RFID tag is to be placed directly against
On human body, therefore, electrical length, impedance matching and the radiation efficiency of label will cause certain deterioration because of bulk effect.
The prior art proposes many methods for improving RFID tag performance.For example, using the method for active RFID tag
Reading/writing distance can be increased, however, the cost that additional power supply not only increases label also increases the volume of label.
It is solved the above problems with ultra-high frequency RFID label therefore, it is necessary to provide a kind of telemedicine monitoring system.
In invention
The object of the present invention is to provide a kind of telemedicine monitoring system ultra-high frequency RFID labels.
The present invention is achieved through the following technical solutions above-mentioned purpose：
A kind of telemedicine monitoring system ultra-high frequency RFID label, including medium substrate, slotted patch antenna, flexible media base
Plate, label chip, left side viscosity copper adhesive tape, right side viscosity copper adhesive tape, metal, upside T-slot, downside T-slot, left side micro-strip
Feeder line, right side microstrip feed line；Wherein, slotted patch antenna is arranged in the upper surface of medium substrate, and flexible dielectric substrate is tightly attached to
The lower surface of medium substrate, upside T-slot and downside T-slot are symmetricly set on slotted patch antenna, the both ends of label chip
It is respectively welded at two open circuit end positions of left side microstrip feed line and right side microstrip feed line, left side viscosity copper adhesive tape and right side viscosity copper
Adhesive tape is respectively adhered on the left and right sides of flexible dielectric substrate upper surface, the both ends of left side viscosity copper adhesive tape respectively with slotted patch
The left end short circuit of the left end, metal ground of antenna is connected, the both ends of right side viscosity copper adhesive tape respectively with the right end of slotted patch antenna,
The right end short circuit on metal ground is connected, and is formed in flexible dielectric substrate lower surface by rectangular adhesive's copper tape-stripping to metal.
Further, the medium substrate, it is characterised in that preferably than relatively thin polytetrafluoroethylene (PTFE)（FR4）Material is thick
Degree is 0.4 mm, deform upon during label use, when still can keep the stability of antenna frequencies, while use is compared
Thin medium substrate can reduce the volume and weight of label.
Further, the slotted patch antenna cuts out a pair of symmetrical T-slot by rectangular patch and constitutes；The T
Type groove is made of the upside T-slot and downside T-slot being correspondingly arranged, and upside T-slot is dug in the upside of rectangular patch, downside T
Type groove is dug in the downside of rectangular patch；The upside T-slot and the downside T-slot, are symmetricly set on slotted patch antenna
On, axisymmetricly with the center line of slotted patch antenna.
Further, the upside T-slot and the downside T-slot are by a section perpendicular to the narrow of rectangular patch long side
Slot and a section are parallel to the sipes composition of rectangular patch long side；The close phase of resonant frequency of narrow slot and the size of sipes and antenna
It closes, the dimensional parameters of the narrow slot and sipes that can adjust T-slot meet impedance matching and required antenna resonance frequency to obtain
Rate.Wherein, increasing the sipes length of T-slot can effectively make antenna adjust resonant frequency toward low frequency direction, increase T-slot
Sipes width can make antenna effectively adjust resonant frequency toward high frequency direction, and antenna can be made by increasing the narrow slot width of T-slot
Effectively resonant frequency is adjusted toward high frequency direction.
Further, the flexible dielectric substrate, it is characterised in that make using flexible dielectric substrate as substrate whole
A label can bear larger curvature.
Further, slotted patch antenna is tightly attached to the upper surface of flexible dielectric substrate so that label is in normal use feelings
Under condition, slotted patch antenna will not be influenced by because label bending is brought, and maintained the frequency stability of label antenna, met
The basic demand of wearable antenna；Flexible dielectric substrate is preferably flexible PVC material, the material of the flexible dielectric substrate
It is not limited to flexible PVC material, the other types material with similar performance can be used.
Further, left side viscosity copper adhesive tape and right side viscosity copper adhesive tape are respectively adhered on flexible dielectric substrate upper surface
The both ends of the left and right sides, left side viscosity copper adhesive tape are connected with the left end short circuit of the left end of slotted patch antenna, metal ground respectively, right
The both ends of side viscosity copper adhesive tape are connected with the right end short circuit of the right end of slotted patch antenna, metal ground respectively, left side viscosity copper glue
Band, right side viscosity copper adhesive tape collectively form an open flume type cavity radiation after being connected with slotted patch antenna short circuit to metal
Device, resulting induction reactance can effectively offset the capacitive reactance of label chip itself, be conducive to adjust slotted patch antenna and mark
Sign the conjugate impedance match of chip.
Further, the left side viscosity copper adhesive tape and right side viscosity copper adhesive tape are all rectangles, increase the sticky copper in left side
The length of adhesive tape and right side viscosity copper adhesive tape can effectively reduce the resonant frequency of label antenna.
Further, it is the metal by a piece of rectangular adhesive's copper tape-stripping in the lower surface of flexible dielectric substrate
It constitutes, the lower surface that sticky copper adhesive tape can easily be pasted onto flexible dielectric substrate forms metallization ground, and can facilitate
Ground is connected with two terminal shortcircuits of left side viscosity copper adhesive tape, right side viscosity copper adhesive tape.
Compared with prior art, the present invention has the advantages that：
1) small, it is simple in structure, it is suitable for the application scenarios such as wearable device；
2）Entire label is enable to bear larger curvature using flexible dielectric substrate as substrate, meanwhile, slotted patch
Antenna uses hard FR4 medium substrates so that label under normal usage, will not be brought by because of label bending
It influences, maintains the frequency stability of label well, meet the basic demand of wearable antenna；
3) can be that resonant frequency is adjusted and is conducive to reach impedance matching by designing the parameter of T-slot；The fourth is this
The flexible ultra-high-frequency RFID tag of invention has the advantages that reading distance is remote, in the case of free space label maximum read away from
From 8 m are reached, maximum reading distance when being placed on human body wrist reaches 6.6 m.
Description of the drawings
Fig. 1 is the cross-sectional view of ultra-high frequency RFID label of the present invention.
Fig. 2 is the planar structure schematic diagram of ultra-high frequency RFID label of the present invention.
Fig. 3 is the three dimensional structure diagram of ultra-high frequency RFID label of the present invention.
Fig. 4 is that ultra-high frequency RFID label of the present invention is attached to the schematic diagram on wrist model.
Fig. 5 is the planar structure schematic diagram of ultra-high frequency RFID label of the present invention
Fig. 6 is ultra-high frequency RFID label antenna of the present invention in free space and the emulation being attached in wrist and measures return loss
Curve with frequency change.
Fig. 7 is the song that the return loss of ultra-high frequency RFID label antenna of the present invention changes with the sipes length Sl of T-slot
Line.
Fig. 8 is the curve that the return loss of ultra-high frequency RFID label antenna of the present invention changes with the sipes width S w of T-slot.
Fig. 9 is the curve that the return loss of ultra-high frequency RFID label antenna of the present invention changes with the narrow slot width S g of T-slot.
Figure 10 is the curve that the return loss of ultra-high frequency RFID label antenna of the present invention changes with sticky copper length of tape d.
Figure 11 is the simulated radiation directional diagram in the case of ultra-high frequency RFID label antenna plane type of the present invention.
Figure 12 is that ultra-high frequency RFID label antenna of the present invention is attached to the simulated radiation directional diagram on wrist model.
Figure 13 ultra-high frequency RFID label antennas of the present invention are attached to the test device on pork.
Figure 14 ultra-high frequency RFID label antenna measurement schematic devices of the present invention.
Figure 15 is the measurement maximum read distance of ultra-high frequency RFID label of the present invention.
Figure 16 is that ultra-high frequency RFID label antenna of the present invention reads distance in the measurement of y-z plane.
Specific implementation mode
In description of the invention, it is to be understood that term " left end ", " right end " " upper surface ", " lower surface ", " a left side
Either position relationship is orientation based on ... shown in the drawings or position in the orientation of the instructions such as side ", " right side ", " upside ", " downside "
Relationship is merely for convenience of description of the present invention and simplification of the description, and it is specific that cannot regard as indicated element or device
Orientation.
In description of the invention, given structure size is preferred parameter, and with reference to the embodiment of the present invention, modification is each
The parameter of component can further obtain actually required performance.
Embodiment 1：
- Fig. 5 referring to Fig.1, flexible ultra-high-frequency RFID tag of the present invention are made of following sections：Medium substrate 1, slotted patch
Antenna 2, flexible dielectric substrate 3, label chip 4, left side viscosity copper adhesive tape 5, right side viscosity copper adhesive tape 6, metal 7, upside T-type
Slot 8, downside T-slot 9, left side microstrip feed line 10, right side microstrip feed line 11；Wherein, slotted patch antenna 2 is in medium substrate 1
Upper surface, flexible dielectric substrate 3 are tightly attached to the lower surface of medium substrate 1, and upside T-slot 8 and downside T-slot 9 are symmetricly set on
On slotted patch antenna 2, the both ends of label chip 4 are respectively welded at left side microstrip feed line 10 and the two of right side microstrip feed line 11 and open
Terminal position, left side viscosity copper adhesive tape 5 and right side viscosity copper adhesive tape 6 are respectively adhered on the left and right of 3 upper surface of flexible dielectric substrate
Both sides, the both ends of left side viscosity copper adhesive tape 5 respectively with the left end of slotted patch antenna 2, metal 7 left end short circuit be connected, it is right
The both ends of side viscosity copper adhesive tape 6 respectively with the right end of slotted patch antenna 2, metal 7 right end short circuit be connected, 7 be to metal
It is formed in the lower surface of flexible dielectric substrate 3 by rectangular adhesive's copper tape-stripping.
Medium substrate 1, preferably than relatively thin polytetrafluoroethylene (PTFE)（FR4）Material, thickness are 0.4 mm, the advantage is that label
It is deformed upon during use（Such as：Bending, extruding etc..）When still can keep the stability of antenna frequencies, while use than
Relatively thin medium substrate can reduce the volume and weight of label.Ultra-high frequency RFID label antenna of the present invention shown in Fig. 6 from
By space and the emulation being worn in wrist and measure return loss curve with frequency change, it can be seen that this ultrahigh frequency RFID
Label antenna still maintains stable work band when free space is with being worn in wrist near 915 MHz of centre frequency
It is wide.
The material type of medium substrate 1 is not limited to polytetrafluoroethylene (PTFE)（FR4）Material, using other with similar performance
Types of material.
Slotted patch antenna 2, by medium substrate 1, upside T-slot 8, downside T-slot 9, left side microstrip feed line 10, right side is micro-
Ribbon feeder 11 collectively constitutes, wherein T-slot 8 is located at the upside of slotted patch antenna 2, and T-slot 9 is located at slotted patch antenna 2
Downside, the T-slot are perpendicular to the narrow slot of rectangular patch long side and to be parallel to the sipes group of rectangular patch long side by a section
At, the narrow slot of the T-slot and the size of sipes and the resonant frequency of antenna are closely related, can adjust T-slot narrow slot and
The dimensional parameters of sipes meet impedance matching and required antenna resonant frequency to obtain.Referring to Figure 5, the T-slot
Sipes length be set as Sl, sipes width is set as Sw, narrow slot width is set as Sg；Fig. 7 is ultrahigh frequency RFID mark of the present invention
Sign the curve that the return loss of antenna changes with the sipes length Sl of T-slot, it can be seen that the resonant frequency of antenna is with sipes
Length Sl increases and reduces, it was demonstrated that sipes length Sl can effectively make the antenna toward low frequency direction adjusting resonant frequency.Fig. 8 is
The curve that the return loss of ultra-high frequency RFID label antenna of the present invention changes with the sipes width S w of T-slot, it can be seen that antenna
Resonant frequency increase as sipes width S w increases, it was demonstrated that sipes width S w effectively can make antenna toward high frequency direction
Adjust resonant frequency.Fig. 9 is the return loss of ultra-high frequency RFID label antenna of the present invention with the narrow slot width S g variations of T-slot
Curve, it can be seen that the resonant frequency of antenna is increased as narrow slot width S g increases, it was demonstrated that narrow slot width S g can be effective
Ground makes antenna adjust resonant frequency toward high frequency direction.
Flexible dielectric substrate 3 enables entire label to bear larger bending using flexible dielectric substrate 3 as substrate
Degree.Further, slotted patch antenna 2 is tightly attached to the upper surface of flexible dielectric substrate 3 so that label is in normal use situation
Under, slotted patch antenna 2 will not be influenced by because label bending is brought, and maintained the frequency stability of label, met wearing
The basic demand of formula antenna.Further, flexible dielectric substrate 3 is preferably flexible PVC material, and thickness is 1.2 mm, dielectric
Constant is 2.75.The material of the flexible dielectric substrate 3 is not limited to flexible PVC material, using its with similar performance
His types of material.
Label chip 4, the selected entitled Alien Higgs 4 of label chip, packing forms SOT232
Package, impedance value are 8 j142 Ω.
7 it is made of in the lower surface of flexible dielectric substrate 3 a piece of rectangular adhesive's copper tape-stripping to metal, sticky copper
The lower surface that adhesive tape can easily be pasted onto flexible dielectric substrate 3 forms metallization ground, and can be easily viscous with left side
Property copper adhesive tape 5, right side viscosity copper adhesive tape 6 two terminal shortcircuits be connected, form open wire chamber.
Microstrip feed line shares two, is divided into left side microstrip feed line 10 and right side microstrip feed line 11, two microstrip feed lines are common
T- type grooves 8 and T- type grooves 9 is separated, two open ends of left side microstrip feed line 10 and right side microstrip feed line 11 are respectively intended to weld
Label chip, it is notable that the width of left side microstrip feed line 10 and right side microstrip feed line 11 will take into account selected label chip
Package dimension determine.
In the present embodiment, slotted patch antenna 2, left side viscosity copper adhesive tape 5, right side viscosity copper adhesive tape 6, metal it is 7 logical
Short circuit welding is crossed, open flume type cavity radiator is constituted.
In the present embodiment, by metal 7 with the left side viscosity copper adhesive tape 5 of 3 upper surface of flexible dielectric substrate, right side viscosity
The connected obtained induction reactance of 6 short circuit of copper adhesive tape, can effectively offset the capacitive reactance of label chip itself.
In the present embodiment, left side viscosity copper adhesive tape 10 and right side viscosity copper adhesive tape 11 are rectangle, the size of length value
Can be with the resonant frequency of effective influence label antenna, referring to Figure 5, left side viscosity copper adhesive tape 10 and right side viscosity copper adhesive tape
11 length is set as d, and Figure 10 is that the return loss of ultra-high frequency RFID label antenna of the present invention changes with sticky copper length of tape d
Curve, as seen from the figure, the resonant frequency of label antenna can be effectively reduced by increasing the value of d.
Embodiment 2：
In order to prove the excellent properties of this flexible ultra-high-frequency RFID tag, the antenna pattern of the label antenna is imitated
Very, and to the reading distance of label practical measurement has been carried out, result 1- Figure 14 referring to Fig.1.
In the present embodiment, label antenna antenna pattern is carried out to Fig. 3 and two kinds of situations shown in Fig. 4 first to imitate
Very, wherein it is the label antenna for not bending i.e. plane shown in Fig. 3, is that label antenna is attached on wrist model shown in Fig. 4,
In emulation, wrist model is approximately a cylinder, is skin respectively from outside to inside, fat, muscle, bone network.Figure 11 is shown
Normalization simulated radiation directional diagram in the case of ultra-high frequency RFID label antenna plane type of the present invention, it can be seen from figure 11 that
Label antenna has good omni-directional in x-z-plane, and the plane where y-z has lateral well（The directions direction ± z）Spoke
Performance is penetrated, finally, the plane where x-y, label antenna has clearly bi-directional radiance.Figure 12 illustrates superelevation of the present invention
Frequency RFID label antenna is attached to the normalization simulated radiation directional diagram on wrist model.As seen from Figure 12, x-z and y-z institutes
Decline about 5-6 dB in the directions signal intensity ratio+z in the directions-z of plane, this is because human body wrist absorbs part toward hand
Caused by the electromagnetic wave that wrist direction is propagated, simultaneously as the effect of human hand wrist, the directions+z signal peak also from -4.62
DBi is reduced to -6.87 dBi.
In the present embodiment, in order to accurately measure the maximum reading distance of this flexible ultra-high-frequency RFID tag, using business
Testing tool " Voyantic Tagformance Pro " has carried out integrated testing twice.It tests for the first time, as shown in figure 13,
Replace human body wrist using one piece of fresh pork, this is because fresh pork be easily obtained and its electrical characteristics with it is true
Human body wrist is closely similar.Figure 14 illustrates the schematic device of measurement, uses the normal linearity water that a gain is 7.2 dBi
Flat poliarizing antenna is less than 0.5W (27 dBm), effective omnidirectional of antenna in this measurement as transmitting antenna, input power
Radiant power is 2.63 W (34.2 dBm)；Second of test, using the identical device with first time, difference lies in tested
Fresh pork is not used in journey, only measures plane label antenna.Figure 15 illustrates plane label antenna and be not attached to
On pork and the maximum read distance curve with frequency change that is attached on pork, it can be seen from the figure that in 900-930
Within the scope of MHz frequency, the reading distance of label is between 6.6-8.0 m ranges.Figure 16 is illustrated in 915 MHz frequency lower planes
Type label antenna is in the direction plane figure for not being attached on pork and being attached on pork（Y-z plane）, it can be seen from the figure that
Plane label antenna be not attached on pork i.e. in free space, and reaching maximum reading distance in the directions+z is
8 m are 2.2 m in lateral minimum reading distance, and in the case where label antenna is attached to pork, label institute is attainable farthest to read
It is 7.18 m, minimum 2 m to read distance.This example demonstrated this flexible ultra-high-frequency RFID tag have reading distance it is remote,
The excellent properties of good directionality.
Above-described is only some embodiments of the present invention.For those of ordinary skill in the art, not
Under the premise of being detached from the invention design, various modifications and improvements can be made, these belong to the protection model of the present invention
It encloses.
Claims (9)
1. a kind of telemedicine monitoring system ultra-high frequency RFID label, it is characterised in that：Including medium substrate, slotted patch day
Line, flexible dielectric substrate, label chip, left side viscosity copper adhesive tape, right side viscosity copper adhesive tape, metal, upside T-slot, downside T
Type groove, left side microstrip feed line, right side microstrip feed line；Wherein, slotted patch antenna is arranged in the upper surface of medium substrate, and flexibility is situated between
Matter substrate is tightly attached to the lower surface of medium substrate, and upside T-slot and downside T-slot are symmetricly set on slotted patch antenna, mark
The both ends of label chip are respectively welded at two open circuit end positions of left side microstrip feed line and right side microstrip feed line, left side viscosity copper adhesive tape
The left and right sides of flexible dielectric substrate upper surface, the both ends point of left side viscosity copper adhesive tape are respectively adhered on right side viscosity copper adhesive tape
It is not connected with the left end short circuit of the left end of slotted patch antenna, metal ground, the both ends of right side viscosity copper adhesive tape are pasted with fluting respectively
The right end short circuit of the right end, metal ground of chip antenna is connected, metal by rectangular adhesive's copper tape-stripping under flexible dielectric substrate
Surface is formed.
2. a kind of telemedicine monitoring system ultra-high frequency RFID label according to claim 1, it is characterised in that：It is described
Medium substrate, it is characterised in that preferably than relatively thin polytetrafluoroethylene (PTFE) (FR4) material, thickness 0.4mm, label uses process
In deform upon, when still can keep the stability of antenna frequencies, while can reduce mark using than relatively thin medium substrate
The volume and weight of label.
3. a kind of telemedicine monitoring system ultra-high frequency RFID label according to claim 2, it is characterised in that：It is described
Slotted patch antenna a pair of symmetrical T-slot cut out by rectangular patch constitute；The T-slot is by the upside T that is correspondingly arranged
Type groove and downside T-slot are constituted, and upside T-slot is dug in the upside of rectangular patch, and downside T-slot is dug under rectangular patch
Side；The upside T-slot and the downside T-slot, are symmetricly set on slotted patch antenna, with the center of slotted patch antenna
Line is axisymmetricly.
4. a kind of telemedicine monitoring system ultra-high frequency RFID label according to claim 3, it is characterised in that：It is described
Upside T-slot and the downside T-slot are to be parallel to rectangle patch perpendicular to the narrow slot of rectangular patch long side and a section by a section
The sipes of piece long side forms；The resonant frequency of the size and antenna of narrow slot and sipes is closely related, and can adjust the narrow slot of T-slot
Meet impedance matching and required antenna resonant frequency with the dimensional parameters of sipes to obtain；Wherein, increase the sipes of T-slot
Length can effectively make antenna adjust resonant frequency toward low frequency direction, and increasing the sipes width of T-slot can make antenna effective
Ground adjusts resonant frequency toward high frequency direction, increases the narrow slot width of T-slot and antenna can be made effectively humorous toward high frequency direction adjusting
Vibration frequency.
5. a kind of telemedicine monitoring system ultra-high frequency RFID label according to claim 4, it is characterised in that：It is described
Flexible dielectric substrate, it is characterised in that using flexible dielectric substrate as substrate entire label is born larger curved
Curvature.
6. a kind of telemedicine monitoring system ultra-high frequency RFID label according to claim 5, it is characterised in that：Fluting
Paster antenna is tightly attached to the upper surface of flexible dielectric substrate so that under normal usage, slotted patch antenna will not for label
It is influenced by because label bending is brought, maintains the frequency stability of label antenna, meet the basic demand of wearable antenna；
Flexible dielectric substrate is preferably flexible PVC material, and the material of the flexible dielectric substrate is not limited to flexible PVC material, can
Use the other types material with similar performance.
7. a kind of telemedicine monitoring system ultra-high frequency RFID label according to claim 6, it is characterised in that：Left side
Sticky copper adhesive tape and right side viscosity copper adhesive tape are respectively adhered on the left and right sides of flexible dielectric substrate upper surface, left side viscosity copper glue
The both ends of band are connected with the left end short circuit of the left end of slotted patch antenna, metal ground respectively, the both ends point of right side viscosity copper adhesive tape
It is not connected with the right end short circuit of the right end of slotted patch antenna, metal ground, left side viscosity copper adhesive tape, right side viscosity copper adhesive tape, gold
Possession collectively forms an open flume type cavity radiator after being connected with slotted patch antenna short circuit, and resulting induction reactance can be with
The effective capacitive reactance for offsetting label chip itself is conducive to the conjugate impedance match for adjusting slotted patch antenna and label chip.
8. a kind of telemedicine monitoring system ultra-high frequency RFID label according to claim 7, it is characterised in that：It is described
Left side viscosity copper adhesive tape and right side viscosity copper adhesive tape be all rectangle, increase the sticky copper adhesive tape in left side and right side viscosity copper adhesive tape
Length can effectively reduce the resonant frequency of label antenna.
9. a kind of telemedicine monitoring system ultra-high frequency RFID label according to claim 8, it is characterised in that：It is described
Metal be to be made of in the lower surface of flexible dielectric substrate a piece of rectangular adhesive's copper tape-stripping, sticky copper adhesive tape can be square
Just be pasted onto flexible dielectric substrate lower surface formed metallization ground, and can easily with left side viscosity copper adhesive tape, the right side
Two terminal shortcircuits of side viscosity copper adhesive tape are connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810619411.7A CN108776829A (en) | 2018-06-15 | 2018-06-15 | Medical detection ultra-high frequency RFID label |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810619411.7A CN108776829A (en) | 2018-06-15 | 2018-06-15 | Medical detection ultra-high frequency RFID label |
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| CN108776829A true CN108776829A (en) | 2018-11-09 |
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| CN115275626A (en) * | 2022-07-28 | 2022-11-01 | 集美大学 | Liquid crystal material dual-frequency reconfigurable antenna based on electromagnetic band gap structure |
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