CN216597963U - Radio frequency identification reader antenna - Google Patents
Radio frequency identification reader antenna Download PDFInfo
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- CN216597963U CN216597963U CN202123103336.5U CN202123103336U CN216597963U CN 216597963 U CN216597963 U CN 216597963U CN 202123103336 U CN202123103336 U CN 202123103336U CN 216597963 U CN216597963 U CN 216597963U
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Abstract
The application provides a radio frequency identification reader antenna for intelligent tool management cabinet, it includes: the feed base plate and be located the radiation base plate of feed base plate one side, one side of feed base plate disposes the feed network, the feed base plate side of keeping away from of radiation base plate disposes open circuit branch knot, radiation base plate with open circuit branch knot opposite side dispose main radiation paster, the peripheral even spaced disposes coupling branch knot in circumference of main radiation paster, just there is the clearance between main radiation paster and the coupling branch knot, the metal connecting post, the quantity of metal connecting post matches open circuit branch knot, just feed network is connected to metal connecting post one side, the opposite side is connected open circuit branch knot. The antenna expands the bandwidth of the antenna by loading four coupling branches at four corners of a main radiation patch, namely an antenna radiation unit, and improves the radiation gain of the antenna, so that the antenna has good circular polarization performance.
Description
Technical Field
The application relates to the technical field of antennas, in particular to an ultrahigh frequency radio frequency identification reader antenna applied to asset management scenes.
Background
With the advent and successful application of Radio Frequency Identification (RFID) technology to article management, company asset management has achieved automation and intelligence, greatly improving the accuracy and efficiency of management. An RFID system generally comprises three parts, namely a reader, a tag and a back-end computer system, wherein the communication between the reader and the tag is performed by means of electromagnetic wave radiation of an antenna, and the performance of the antenna determines the performance of the RFID system to a great extent.
In recent years, studies on reader antennas by scholars at home and abroad have been uninterrupted, and various reader antennas have been proposed. The antenna has the advantages of small size, high gain and the like, but the relative bandwidth of the antenna is only 10%; a dual-frequency circularly polarized microstrip antenna with a simple structure is designed in a novel material-fed RFID reader dual-frequency working antenna J communication technology 2021,54(05):1251-1256 ], the antenna adopts a carbon nano tube metal film as a feeder line, and an open double-ring resonator (SRR) and an open single-ring resonator (SSRR) patch structure are utilized to resonate well in 2.45GHz and 5.8GHz frequency bands, but the bandwidth of the antenna is narrow, the material cost is high, and the mass production is not easy to realize; document 3[ z.liu, l.zhu and x.zhang, "a Low-Profile and High-Gain CP Patch Antenna With Improved AR Bandwidth Via tuned Ring Resonator," in IEEE Antennas and Wireless amplification Letters, vol.18, No.2, pp.397-401, feb.2019, doi:10.1109/lawp.2019.2892097] proposes a Resonator-fed circularly polarized Patch Antenna, which is loaded With a short-circuit pin to achieve the objectives of increasing AR Bandwidth, High Gain, and Low Profile at the same time, but while improving the axial ratio and Gain, the S11 of the Antenna deteriorates, and the resonance depth is not sufficient, and a good match cannot be achieved; document 4[ y.cai, k.li, y.yin and x.ren, "Dual-Band circular Polarized Antenna Combining Slot and Microstrip models for GPS With HIS group Plane," in IEEE Antennas and Wireless amplification Letters, vol.14, pp.1129-1132,2015, doi:10.1109/lawp.2015.2395538] proposes a Dual-Band circular Polarized patch Antenna for UHF-RFID and WLAN bands, which reduces the first resonance to MHz 915 and introduces a new resonance at 2.45GHz by etching two perpendicular slots in the patch, which makes use of the Dual-Band feature to implement an Antenna system for use With an RFID reader and detect tags and transmit information over the WLAN Band, but the relative bandwidth of the Antenna is relatively narrow, 5.25% and 2%, respectively, and the gain in the RFID Band is only 3.1, which limits the reading range of the system.
Based on this, there is a need to improve existing radio frequency identification readers.
SUMMERY OF THE UTILITY MODEL
To overcome the above-mentioned drawbacks, the present application aims to: the application provides an use ultrahigh frequency radio frequency identification reader antenna in asset management scene, and this antenna has advantages such as high gain, high return loss, broadband and low axial ratio.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a radio frequency identification reader antenna for an intelligent tool management cabinet, comprising:
a feed substrate and a radiating substrate located at one side of the feed substrate,
one side of the feed substrate is provided with a feed network,
an open-circuit branch is arranged on the side of the radiation substrate far away from the feed substrate, a main radiation patch is arranged on the side of the radiation substrate opposite to the open-circuit branch, coupling branches are uniformly arranged on the periphery of the main radiation patch at intervals in the circumferential direction, and a gap is arranged between the main radiation patch and the coupling branches,
the number of the metal connecting columns is matched with that of the open-circuit branches, one side of each metal connecting column is connected with the feed network, and the other side of each metal connecting column is connected with the open-circuit branches. The antenna expands the bandwidth of the antenna and improves the radiation gain of the antenna by loading four coupling branches at four corners of a main radiation patch, namely an antenna radiation unit; and through introducing the feed mode of capacitive coupling, can make the resonance that the antenna matches deepen, reach the effect of low standing-wave ratio, and set up the width of four branch knots of opening a way into the gradual change form, cooperate with the perturbation structure all around the main radiation paster, adjust the antenna axial ratio, make it have very good circular polarization performance.
Preferably, the metal connecting column is a copper column.
Preferably, the radiation substrate is a double-sided FR4 radiation substrate, and the main radiation patch is not electrically connected to the metal connection post,
the open-circuit branch couples the signal to the main radiation patch in a capacitive coupling mode.
Preferably, a reflector is disposed on the side of the feed board remote from the radiation board.
Preferably, the feed network on the radiating substrate comprises circular patches, the number of the circular patches is matched with that of the metal connecting columns, and one side ends of the metal connecting columns are connected to the circular patches.
Preferably, the radiation substrate includes: the width of the four open-circuit branches is gradually decreased in one direction.
Preferably, the radiation substrate is square, the four coupling branches are respectively arranged at the corners of the square, and the coupling branches are on the same side as the main radiation patch.
Preferably, the radiation substrate further includes: the first perturbation structure comprises rectangular patches which are positioned on two sides of the main radiation patch, and the rectangular patches and the main radiation patch are designed integrally.
Preferably, the radiation substrate further comprises a second perturbation structure, and the second perturbation structure is a rectangular blank area.
Preferably, a circular gap is configured on the main radiation patch, and the radius of the circular gap is larger than that of the copper column, so that the main radiation patch is not electrically connected with the metal connecting column.
Advantageous effects
Compared with the prior art, the (ultrahigh frequency) radio frequency identification reader antenna has the advantages that the scanning beam is narrow, the far field gain is high, the directionality is good, the tags outside a limited area can be prevented from being misread, and the tags at a longer distance in the scanning range can be detected; the detection of the linearly polarized label in any direction can be realized. Meanwhile, the antenna has the advantages of simple structure, wear resistance and the like, and is convenient to install.
Drawings
Figure 1 is a schematic diagram of a top view of an antenna of an rfid reader antenna according to an embodiment of the present application,
figure 2 is a schematic view of a radiating patch structure of an rfid reader antenna according to an embodiment of the present application,
figure 3 is a side view of an rfid reader antenna according to an embodiment of the present application,
figure 4 is a block diagram of a feed network for an rfid reader antenna according to an embodiment of the present application,
figure 5 is a graph of antenna input impedance simulations for an rfid reader antenna according to an embodiment of the present application,
figure 6 is a schematic diagram of antenna return loss simulation for an rfid reader antenna according to an embodiment of the present application,
figure 7 is a simulation diagram of antenna gain and axial ratio for an rfid reader antenna according to an embodiment of the present application,
figure 8 is an antenna far field gain plot for an rfid reader antenna according to an embodiment of the present application,
fig. 9 is a simulation result of an antenna beam angle of an rfid reader antenna according to an embodiment of the present application.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present application. The conditions employed in the examples may be further adjusted as determined by the particular manufacturer, and the conditions not specified are typically those used in routine experimentation.
The application provides a radio frequency identification reader antenna for intelligent tool management cabinet, it includes: the antenna comprises a feed substrate and a radiation substrate positioned on one side of the feed substrate, wherein a feed network is configured on one side of the feed substrate, an open-circuit branch section is configured on the side of the radiation substrate far away from the feed substrate, a main radiation patch (also called an antenna radiation unit) is configured on the side of the radiation substrate opposite to the open-circuit branch section, coupling branch sections are uniformly configured on the periphery of the main radiation patch at intervals in the circumferential direction, a gap is reserved between the main radiation patch and the coupling branch sections, metal connecting columns are arranged, the number of the metal connecting columns is matched with that of the open-circuit branch sections, one side of each metal connecting column is connected with the feed network, and the other side of each metal connecting column is connected with the open-circuit branch section.
The antenna expands the bandwidth of the antenna and improves the radiation gain of the antenna by loading four coupling branches at four corners of an antenna radiation unit; by introducing a feed mode of capacitive coupling, the resonance of antenna matching can be deepened, namely the effect of low standing-wave ratio is achieved, the widths of the four open-circuit branches are set to be in a gradual change mode and are mutually matched with perturbation structures around the main radiation patch, and the axial ratio of the antenna is adjusted, so that the antenna has good circular polarization performance; the antenna has the performances of high gain, wide frequency band, low axial ratio, high return loss and the like.
The radio frequency identification reader antenna proposed by the present application, which is applied to an intelligent tool management cabinet, is described next with reference to the accompanying drawings.
Fig. 1-4 are schematic structural diagrams of an rfid reader antenna according to an embodiment of the present invention, and the antenna is preferably used in an intelligent tool management cabinet.
Fig. 1 is a schematic diagram of a top view of an rfid reader antenna, in which the radiating substrate 10 is adjusted to be transparent (in practice, the radiating substrate 10 may or may not be transparent) for displaying the result.
A radio frequency identification reader antenna for an intelligent tool management cabinet, comprising:
a feeding substrate 20 and a radiating substrate 10 on one side of the feeding substrate 20,
a main radiation patch 12, four capacitive coupling branches 13 located outside the main radiation patch 12, and a plurality of radiating patches 12,
A plurality of metal connection posts 40 for connecting the radiating substrate 10 and the feeding substrate 20. The metal connection post 40 is used to transfer the electric energy of the feeding substrate 20 to the radiation substrate 10. Preferably, the metal connecting column is a copper column.
In this embodiment, 4 copper pillars are used. Radiating substrate 10 the radiating substrate is a double-sided FR4 radiating substrate. The feed network 50 is disposed on the side of the feed substrate 20 facing the radiation substrate, and the reflector 30 is disposed on the side away from the radiation substrate. The top surface of the radiating substrate 10 (i.e. the side away from the feeding substrate is electrically connected to the metal connecting column). In one embodiment, the radiation substrate 10 is a double-sided FR4 radiation substrate with a thickness of 0.8mm, the bottom surface (see fig. 2) of the radiation substrate is configured with a main radiation patch 12, four coupling branches 13 are uniformly arranged at intervals on the periphery of the main radiation patch 12, the four coupling branches 13 are configured in a gradual change form with the same length but gradually decreasing width, and the purpose of the gradual change form is to increase one dimension for adjusting axial ratio. When the main radiation patch is arranged on the bottom surface, the main radiation patch is evolved from a circular patch having an initial radius of 76.5 mm. The evolution process is as follows:
firstly, coupling branches are introduced at the circumferential direction of the circular patch at even intervals (namely four corners), the bandwidth of the antenna is expanded,
the distance between the coupling branch and the circular patch is caused by a circular ring with the outer diameter of 81.5mm and the inner diameter of 76.5 mm; then, respectively introducing surrounding (perturbation) structures in the horizontal direction and the vertical direction, wherein the perturbation structure in the horizontal direction is that a rectangular patch 12a with the length of 65mm and the width of 4.75mm is added on the left and the right, and the perturbation structure in the vertical direction is that a rectangular patch 12b (namely a blank area) with the length of 70mm and the width of 6.5mm is subtracted from the upper and the lower; then two rectangular gaps with the length of 65mm and the width of 2mm are introduced into the center of the patch so as to reduce the size of the antenna;
finally, four circular slots 16 with a radius of 4.5mm at the feed and the four circular slots 12c are larger than the radius of the M3 copper pillars so that the circular slots 12c avoid contact with the copper pillars.
The lower layer of the antenna is a feed substrate 20 with the thickness of 1mm, and the connection with the upper layer radiation substrate is mainly carried out by four copper columns, and the height of each copper column is 23.5 mm. The upper layer of the feed substrate is a feed network 50, and the lower layer is a reflector 30. The feeding network 50 is composed of a circular ring 50 with a diameter of 43mm and a width of 1.8mm, four circular patches 53 with a radius of 3.75mm, and a rectangular patch with a length of 14.5mm and a width of 1.8mm, and the feeding terminal 51 is configured at the edge of the feeding network 50. The feeding end 51 side is provided with a pad 54 to which a feeding line (not shown) is soldered. The circular patch 53 is connected with one end of the copper column, the other end of the copper column is connected with the open-circuit branch 11 on the radiation substrate 10, and after the circular patch is electrified, the open-circuit branch 11 is electrically coupled with the main radiation patch and the coupling branch on the lower side of the open-circuit branch through the capacitance effect.
The working principle of the radio frequency identification reader during the operation is as follows:
the antenna adopts a four-port series feeding mode to feed signals to an open-circuit branch node on the upper layer of the radiation substrate, and the open-circuit branch node couples the signals to the main radiation patch in a capacitive coupling mode. The phase difference between the feed ports can be adjusted by adjusting the diameter of the circular ring in the feed network, so that the phase difference between the four ports is 90 degrees in sequence, and then the width of the four open-circuit branches is adjusted, so that the feed power fed to each port is adjusted, and when the feed power amplitudes between the four ports are equal and the phase difference between the four ports is 90 degrees in sequence, circular polarization can be realized. Coupling branches are introduced into four corners of the main radiation patch, so that broadband matching of the antenna is realized, the radiation area is increased due to the introduction of the coupling patches, and the gain of the antenna can be improved; the perturbation structures are introduced in the horizontal direction and the vertical direction of the patch, and through adjusting the corresponding size, the degenerate modes can be separated, so that the phase difference is 90 degrees, the circular polarization effect is enhanced, and the axial ratio performance of the antenna is improved; two rectangular grooves which are equal in size and perpendicular to each other are formed in the center of the main radiating patch by a meander method, so that the current path of the antenna is prolonged, and the purpose of antenna miniaturization is achieved.
In a preferred embodiment, the parameters of the rfid reader antenna are as follows:
Gnd_xy＝230mm,Pxy＝148mm,M1＝12mm,M2＝11mm,M3＝10mm,M4＝9mm,N＝24mm,H1＝0.8mm,H2＝1mm,H3＝1mm,H4＝23.5mm,Cut_L1＝70mm,Cut_w1＝6.5mm,Cut_L2＝65mm,Cut_w2＝2mm,Cut_r＝4.5mm,Add_L＝65mm,Add_w＝4.75mm,R1＝81.5mm,R2＝76.5mm,Sub_xy＝72mm,Patch_d＝43mm,Patch_r＝3.75mm,Patch_L＝14.5mm,W50＝1.8mm。
the radio frequency identification reader antenna proposed by the present application is verified by simulation below.
Fig. 5 is a simulation diagram of the antenna impedance of the rfid reader antenna, and it can be seen that the input impedance of the antenna is-0.53 + j 49.2 Ω when the frequency is 915 MHz.
FIG. 6 is a simulation result of the reflection coefficient of the RFID reader antenna, and it can be seen from the graph that the impedance bandwidth of the antenna at-10 dB is 0.83-1.08GHz, the relative bandwidth is 27.3%, and resonance is generated at 0.91GHz, and the resonance depth reaches-43 dB.
FIG. 7 is a simulation diagram of antenna gain and axial ratio of the RFID reader antenna, and it can be seen that the antenna gain can reach more than 8dB within 0.89-0.97GHz, and maintain good flatness; and the axial ratio of the antenna has good circular polarization performance within a frequency band of 0.89-0.95GHz by taking 3dB as a standard.
Fig. 8 shows the far field gain diagram of the antenna, and it can be seen that the radiation ranges of the antenna at xoz plane and yoz plane are substantially coincident with each other, thereby proving that the circular polarization performance of the antenna is good at the side surface.
Fig. 9 is a simulation result of the antenna beam angle, which shows that the antenna beam angle ranges from 33 °, and it can be seen that the antenna has a strong beam-focusing ability when radiating electromagnetic waves, i.e., has high directivity.
The above embodiments are merely illustrative of the technical concepts and features of the present application, and the purpose of the embodiments is to enable those skilled in the art to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the present application are intended to be covered by the scope of the present application.
Claims (10)
1. A radio frequency identification reader antenna for an intelligent tool management cabinet, comprising:
a feed substrate and a radiating substrate located at one side of the feed substrate,
one side of the feed substrate is provided with a feed network,
an open-circuit branch is arranged on the side of the radiation substrate far away from the feed substrate, a main radiation patch is arranged on the side of the radiation substrate opposite to the open-circuit branch, coupling branches are uniformly arranged on the periphery of the main radiation patch at intervals in the circumferential direction, and a gap is arranged between the main radiation patch and the coupling branches,
the number of the metal connecting columns is matched with that of the open-circuit branches, one side of each metal connecting column is connected with the feed network, and the other side of each metal connecting column is connected with the open-circuit branches.
2. The rfid reader antenna of claim 1, wherein the metal connection post is a copper post.
3. The radio frequency identification reader antenna of claim 1,
the radiation substrate is a double-sided FR4 radiation substrate, the main radiation patch is not electrically connected with the metal connecting column,
the open-circuit branch couples the signal to the main radiation patch in a capacitive coupling mode.
4. The radio frequency identification reader antenna of claim 1,
the side of the feed substrate far away from the radiation substrate is provided with a reflecting plate.
5. The radio frequency identification reader antenna of claim 4,
the feed network on the radiation substrate comprises circular patches, the number of the circular patches is matched with that of the metal connecting columns, and one side end of each metal connecting column is connected to the corresponding circular patch.
6. The radio frequency identification reader antenna of claim 1,
the radiation substrate includes: the width of the four open-circuit branches is gradually decreased in one direction.
7. The rfid reader antenna of claim 1, wherein the radiating substrate is square, four coupling branches are disposed at corners of the square, and the coupling branches are on the same side as the main radiating patch.
8. The radio frequency identification reader antenna of claim 1,
the radiation substrate further includes: the first perturbation structure comprises rectangular patches which are positioned on two sides of the main radiation patch, and the rectangular patches and the main radiation patch are designed integrally.
9. The radio frequency identification reader antenna of claim 8,
the radiation substrate further comprises a second perturbation structure, and the second perturbation structure is a rectangular blank area.
10. The radio frequency identification reader antenna according to claim 8 or 9,
dispose circular gap on the main radiation paster, just circular gap radius is greater than the radius of copper post for the main radiation paster not with metal connecting post electric connection.
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| CN202123103336.5U CN216597963U (en) | 2021-12-11 | 2021-12-11 | Radio frequency identification reader antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117175196A (en) * | 2023-03-16 | 2023-12-05 | 广州程星通信科技有限公司 | Common-caliber antenna array |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117175196A (en) * | 2023-03-16 | 2023-12-05 | 广州程星通信科技有限公司 | Common-caliber antenna array |
| CN117175196B (en) * | 2023-03-16 | 2024-04-12 | 广州程星通信科技有限公司 | Common-caliber antenna array |
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