CN213636286U - Antenna structure - Google Patents
Antenna structure Download PDFInfo
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- CN213636286U CN213636286U CN202022601117.9U CN202022601117U CN213636286U CN 213636286 U CN213636286 U CN 213636286U CN 202022601117 U CN202022601117 U CN 202022601117U CN 213636286 U CN213636286 U CN 213636286U
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Abstract
The utility model provides an antenna structure, including a plurality of radiating part and a plurality of extension. The radiating portions are separated from each other and arranged in a circle. The extension part is connected with the radiation part and extends towards the circular center. A first gap between two top ends of two adjacent radiation parts is equal to a second gap between two bottom ends of two adjacent extension parts. The utility model discloses an antenna structure can provide the even magnetic field of closely that distributes, and has higher sensitivity and response rate of accuracy.
Description
Technical Field
The utility model relates to an antenna structure especially relates to an use antenna structure at short distance wireless communication.
Background
Radio Frequency Identification (RFID) technology uses a Radio Frequency Identification reader (RFID reader) with an antenna to generate an electromagnetic field or transmit an electromagnetic wave to a Radio Frequency Identification tag (RFID tag), and the Radio Frequency Identification tag receives the electromagnetic wave or generates a response electromagnetic field or electromagnetic wave after sensing the electromagnetic field to be identified by the Radio Frequency Identification reader. The way of wireless identification through the radio frequency identification technology has been widely used for the purposes of automatic production equipment, warehouse management, electronic charging and the like.
The antenna is an important element of the radio frequency identification reader, and the design of the antenna greatly influences the efficiency of wireless identification. Conventional antennas are divided into a Far-Field Antenna (Far Field Antenna) and a Near-Field Antenna (Near Field Antenna) according to the transmission distance, wherein the Far-Field Antenna is used for transmitting or receiving Far-Field electromagnetic waves, and therefore is more important than the gain; the near field antenna is mostly used in the rfid reader, which reads the memory data of the object to be tested by electromagnetic coupling, so the near field antenna focuses more on the electromagnetic field strength.
SUMMERY OF THE UTILITY MODEL
The utility model relates to an antenna structure, it can provide the even magnetic field of closely that distributes, and has higher sensitivity and response rate of accuracy.
The utility model discloses an antenna structure includes a plurality of radiation portions and a plurality of extension. The radiating portions are separated from each other and arranged in a circle. The extension part is connected with the radiation part and extends towards the circular center. A first gap between two top ends of two adjacent radiation parts is equal to a second gap between two bottom ends of two adjacent extension parts.
In an embodiment of the present invention, the first gap ranges from 0.5 mm to 4 mm.
In an embodiment of the present invention, the radiating portion and the extending portion are integrally formed.
In an embodiment of the invention, each of the radiation portions has a first arc-shaped edge and a second arc-shaped edge opposite to each other. The length of the first arcuate edge is greater than the length of the second arcuate edge. The extending portions are respectively connected with two opposite sides of the second arc-shaped edge.
In an embodiment of the invention, a shortest distance between the first arc-shaped edge and the second arc-shaped edge is between 34 mm and 40 mm.
In an embodiment of the present invention, each of the radiation portions is shaped like a fan.
In an embodiment of the present invention, an included angle between the extending direction of the two adjacent first gaps and the circle center is 90 degrees.
In an embodiment of the present invention, one of the radiation portions has an opening to divide the radiation portion into a first radiation portion and a second radiation portion. The aperture of the opening is equal to the first gap.
In an embodiment of the present invention, each of the extending portions includes a first extending portion and a second extending portion, and the first extending portion is vertically connected to the second extending portion.
In an embodiment of the present invention, the length of the first extending portion is between 29 mm and 32 mm.
In an embodiment of the present invention, the length of the second extending portion is between 8 mm and 15 mm.
In an embodiment of the present invention, each of the extending portions is L-shaped.
In an embodiment of the present invention, the L-shape of each extending portion is separated by a second gap, and the back-to-back structure is left-right reversed.
In an embodiment of the present invention, the thickness of each of the radiating portions and the thickness of each of the extending portions are between 0.018 mm to 0.07 mm.
In an embodiment of the present invention, the first radiating portion and the second radiating portion are connected by a transmission line as a feeding line.
In an embodiment of the present invention, the transmission line is a SAM connector, an N-type connector, or a TNC connector.
In an embodiment of the present invention, the antenna structure further includes a carrier, and the radiating portion and the extending portion are disposed on the carrier.
In an embodiment of the present invention, the shape of the carrier includes a square or a circle.
In an embodiment of the present invention, the side length or the diameter of the carrier is between 160 mm and 180 mm.
In an embodiment of the present invention, the thickness of the carrier is between 1.5 mm and 2.5 mm.
Based on the above, in the design of the antenna structure of the present invention, the radiating portions of the antenna structure are separated from each other and arranged in a circular shape, so that the effect of resonance can be achieved, and a close-range magnetic field is generated above the antenna structure. In addition, the extension part of the antenna structure is connected with the radiation part and extends towards the circle center of the circle, so that the magnetic field can be uniformly distributed. In short, the utility model discloses an antenna structure can provide the even closely magnetic field that distributes, and has higher sensitivity and response rate of accuracy.
In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic top view of an antenna structure according to an embodiment of the present invention;
FIG. 2 is a graph of frequency versus impedance for the HFSS computer simulation antenna configuration test of FIG. 1;
FIG. 3 is a graph of frequency versus loss for the HFSS computer simulation antenna configuration test of FIG. 1.
Description of the reference numerals
10, a transmission line;
100 an antenna structure;
110a, 110b, 110c, 110d are radiation parts;
112, a first arc-shaped edge;
114, a second arcuate edge;
113, an opening;
115 a first radiation part;
117 a second radiation part;
120, an extension part;
122, a first extension part;
124, a second extension part;
130, a carrier;
a is the included angle;
c, the center of the circle;
d, the caliber;
l is the shortest distance;
l1, L2 length;
g1: first gap;
g2: second gap;
and T is the side length.
Detailed Description
Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Fig. 1 is a schematic top view of an antenna structure according to an embodiment of the present invention. Referring to fig. 1, in the present embodiment, the antenna structure 100 includes a plurality of radiating portions (four radiating portions 110a, 110b, 110c, and 110d are schematically illustrated) and a plurality of extending portions (eight extending portions 120 are schematically illustrated). The radiation parts 110a, 110b, 110c, 110d are separated from each other and arranged in a circle. The extending portion 120 connects the radiating portions 110a, 110b, 110C, and 110d and extends toward the center C of the circle. The first gap G1 between the top ends 110a, 110b of two adjacent radiating parts is equal to the second gap G2 between the bottom ends of two adjacent extending parts 120. Preferably, the first gap G1 ranges from 0.5 mm to 4 mm, for example.
In detail, in the present embodiment, each radiation portion (e.g., the radiation portion 110a) has a first arc-shaped edge 112 and a second arc-shaped edge 114 opposite to each other. The length of the first arcuate edge 112 is greater than the length of the second arcuate edge 114, wherein the first arcuate edge 112 and the second arcuate edge 114 are disposed in a concentric manner. Preferably, the shortest distance L from the first arc-shaped edge 112 to the second arc-shaped edge 114 is, for example, between 34 mm and 40 mm. As shown in fig. 1, each of the radiation portions 110a, 110b, 110C, and 110d of the present embodiment has a fan shape, for example, and the outer diameters (i.e., the distances from the first arc-shaped edge 112 to the center C) and the inner diameters (i.e., the distances from the second arc-shaped edge 114 to the center C) of the fan shapes are the same.
Furthermore, the radiation portion 110c of the present embodiment has an opening 113 to divide the radiation portion 110c into a first radiation portion 115 and a second radiation portion 117 for connecting to a feeding circuit. Preferably, the aperture D of the opening 113 is equal to the first gap G1, i.e. the aperture D of the opening 113 ranges from 0.5 mm to 4 mm, for example. As shown in fig. 1, the transmission line 10 may be connected to the first radiating portion 115 and the second radiating portion 117, wherein the transmission line 10 may be a SAM connector, an N-type connector, or a TNC connector, which is not limited herein.
In particular, in the present embodiment, the first gap G1 between two adjacent radiation portions 110a, 110b, 110c, and 110d can be used as a gap for coupling the radiation portions 110a, 110b, 110c, and 110d to achieve the effect of resonating with each other, and generate a magnetic field in a short distance above the antenna structure 100. Here, the extending direction of two adjacent first gaps G1 forms an angle a of 90 degrees with the center C, for example, that is, the angles formed by the four fan-shaped gaps (i.e., the radiation portions 110a, 110b, 110C, 110d) and the center C are 90 degrees respectively.
Referring to fig. 1 again, the extending portions 120 of the present embodiment are respectively connected to two opposite sides of the second arc-shaped edge 114, that is, each of the radiating portions 110a, 110b, 110c, and 110d is connected to two extending portions 120. Each extension 120 includes a first extension 122 and a second extension 124, wherein the first extension 122 is vertically connected to the second extension 124. That is, each extension portion 120 is shaped like an L, and the L of each extension portion is separated by a second gap G2 and is configured to be inverted left and right back to back. Preferably, the length L1 of the first extension 122 is between 29 mm and 32 mm, and the length L2 of the second extension 124 is between 8 mm and 15 mm. The L-shaped extension 120 is located inside the circle formed by the radiation portions 110a, 110b, 110c, and 110d, so that the whole antenna structure 100 can have ideal impedance for adjustment and uniform magnetic field distribution.
In the present embodiment, the radiation portions 110a, 110b, 110c, 110d and the extension portion 120 are preferably integrally formed, wherein the radiation portions 110a, 110b, 110c, 110d and the extension portion 120 are formed by etching or printing, for example. The material of the radiation portions 110a, 110b, 110c, 110d and the material of the extension portion 120 are, for example, copper, silver or conductive ink, but not limited thereto. The thickness of each radiation portion 110a, 110b, 110c, 110d and the thickness of each extension portion 120 are, for example, between 0.018 mm and 0.07 mm.
In addition, referring to fig. 1 again, the antenna structure 100 of the present embodiment further includes a carrier 130, wherein the radiation portions 110a, 110b, 110c, and 110d and the extension portion 120 are disposed on the carrier 130. The material of the carrier 130 is, for example, but not limited to, paper, ceramic, epoxy glass fiber board, Polyimide (PI), Polyester (PET), Polyurethane (PU), Polycarbonate (PC), Polyethylene (PE), or polypropylene (PP). Here, the shape of the carrier 130 is, for example, a square, and preferably, the side length T of the carrier 130 is, for example, between 160 mm and 180 mm. Of course, in other embodiments, the carrier may be circular, and the diameter of the carrier is, for example, 160 mm to 180 mm. In addition, the thickness of the carrier 130 is, for example, between 1.5 mm and 2.5 mm, which means that the antenna structure 100 of the embodiment has an advantage of small volume. When fixing, a hole may be cut in the carrier 130 and fixed to the device using related parts, or an adhesive layer may be applied to the back surface of the carrier 130 (i.e. the opposite surface of the antenna) to fix the device, which is not limited herein.
In short, the present embodiment uses four fan- like radiation portions 110a, 110b, 110c, 110d as antenna conductors, and the first gap G1 between each fan-like radiation portions can be used as a mutual coupling gap, so as to achieve the effect of mutual resonance and generate a magnetic field in a short distance above the antenna structure 100. In addition, the extension portion 120 of the antenna structure 100 is connected to the radiation portions 110a, 110b, 110C, and 110d and extends toward the center C of the circle, so that the magnetic field is uniformly distributed. Therefore, the antenna structure 100 of the present embodiment can provide a uniformly distributed short-distance magnetic field, and has a higher sensing sensitivity and sensing accuracy.
In application, the receiving range of the antenna structure 100 of the present embodiment is less than 30 cm, and the antenna structure can be applied to an unmanned store or a vending machine. If the commodities are placed on the goods shelf, each commodity can be provided with a near-field antenna; if the antenna is not arranged on the shelf, the commodity can be arranged on the shelf for checkout when checkout is carried out, but the size or the number of the antennae is increased. Furthermore, the antenna structure 100 of the present embodiment can be applied to a smart shelf, and read by near-field sensing, so that a customer or an employee can take away the goods on the shelf by only swiping an identification card on the sensing device, and can perform a money deduction action by matching with the backend big data, and the details of the transaction can be summarized.
FIG. 2 is a graph of frequency versus impedance for the HFSS computer simulation antenna structure test of FIG. 1. Theoretically, the impedance approaches 50 ± 10 Ω as an ideal value in the 902MHz to 928MHz frequency band. In the impedance test of the HFSS computer-simulated antenna structure shown in fig. 2, three frequencies (labeled as 1, 2, and 3) within the frequency band range of 902MHz to 928MHz are extracted, and the impedance values corresponding to the three frequencies are measured as shown in table one, and the impedance values are close to 50 ± 10 Ω and meet the ideal value range according to the test result.
| HFSS computer simulation antenna structure test | Frequency (GHz) | Impedance value (omega) |
| |
0.90 | 41.26 |
| |
0.91 | 42.41 |
| |
0.92 | 43.68 |
FIG. 3 is a graph of frequency versus loss for the HFSS computer simulation antenna configuration test of FIG. 1. Theoretically, in the 902MHz to 928MHz band, the loss (i.e. signal feedback loss) is ideally lower than-12 dB, i.e. the lower the loss represents the more complete transmission of the energy transmitted from the reader to the antenna. In the loss test of the HFSS computer simulated antenna structure, three frequencies (labeled as 4, 5, and 6) within the frequency band range of 902MHz to 928MHz are taken out, the corresponding loss values (i.e., signal feedback loss values) are measured as shown in the second table, and the loss values are all lower than-12 dB according to the test result, which is in accordance with the ideal value range.
Watch two
| HFSS computer simulation antenna structure test | Frequency (GHz) | Loss value (dB) |
| Mark 4 | 0.90 | -20.09 |
| Mark 5 | 0.91 | -21.67 |
| Mark 6 | 0.92 | -23.36 |
On the other hand, the net instrument physical test is performed on the actual antenna structure, three frequencies (labeled as 7, 8, and 9) within the frequency band range of 902MHz to 928MHz are extracted, the test results are as shown in table three, and it can be known from the test results that the corresponding impedance values are all close to 50 ± 10 Ω, and the corresponding loss values are all lower than-12 dB, so that the ideal value ranges are met.
Watch III
| Net instrument physical testing | Frequency (GHz) | Impedance value (omega) | Loss value (dB) |
| Indication 7 | 0.902 | 56.971 | -17.089 |
| Mark 8 | 0.915 | 57.108 | -19.957 |
| Mark 9 | 0.928 | 55.228 | -20.443 |
Overall, the ideal standard of the antenna matching value is that the impedance value approaches 50 ± 10 Ω and the loss value is lower than-12 dB, which means that the magnetic field distribution near the antenna structure is uniform and has higher sensing sensitivity and sensing accuracy. Referring to fig. 2, fig. 3 and the following table four, as seen from the comparison results of the HFSS computer simulation antenna structure test and the actual antenna net instrument physical test, the impedance values are close to 50 ± 10 Ω, and the loss values are lower than-12 dB, so that the impedance values are within the ideal standard range, i.e. the antenna structure has a uniform magnetic field distribution at a close distance, and has a higher sensing sensitivity and sensing accuracy.
Watch four
In summary, in the design of the antenna structure of the present invention, the radiating portions of the antenna structure are separated from each other and arranged in a circular shape, so as to achieve the effect of resonance, and generate a close magnetic field above the antenna structure. In addition, the extension part of the antenna structure is connected with the radiation part and extends towards the circle center of the circle, so that the magnetic field can be uniformly distributed. In short, the utility model discloses an antenna structure can provide the even closely magnetic field that distributes, and has higher sensitivity and response rate of accuracy.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (20)
1. An antenna structure, comprising:
a plurality of radiating parts separated from each other and arranged in a circle; and
and the plurality of extension parts are connected with the plurality of radiation parts and extend towards the circular center of the circle, wherein a first gap between two top ends of two adjacent radiation parts is equal to a second gap between two bottom ends of two adjacent extension parts.
2. The antenna structure of claim 1, wherein the first gap ranges from 0.5 mm to 4 mm.
3. The antenna structure of claim 1, wherein the plurality of radiating portions and the plurality of extensions are integrally formed structures.
4. The antenna structure according to claim 1, wherein each of the plurality of radiating portions has a first arc-shaped edge and a second arc-shaped edge opposite to each other, a length of the first arc-shaped edge is greater than a length of the second arc-shaped edge, and the plurality of extending portions respectively connect opposite sides of the second arc-shaped edge.
5. The antenna structure of claim 4, wherein a shortest distance from the first curved edge to the second curved edge is between 34 mm and 40 mm.
6. The antenna structure according to claim 1 or 4, characterized in that each of the plurality of radiating portions has a sector shape.
7. The antenna structure according to claim 1, wherein an angle between an extending direction of two adjacent first gaps and the center of the circle is 90 degrees.
8. The antenna structure of claim 1, wherein one of the plurality of radiating portions has an opening to divide the radiating portion into a first radiating portion and a second radiating portion, and the opening has a diameter equal to the first gap.
9. The antenna structure according to claim 8, wherein the first radiating section and the second radiating section are connected by a transmission line as a feeding line.
10. The antenna structure according to claim 9, characterized in that the transmission line is a SAM connection, an N-type connection or a TNC connection.
11. The antenna structure of claim 1, wherein each of the plurality of extensions comprises a first extension and a second extension, the first extension being perpendicularly connected to the second extension.
12. The antenna structure of claim 11, wherein the length of the first extension is between 29 mm and 32 mm.
13. The antenna structure of claim 12, wherein the length of the second extension is between 8 mm and 15 mm.
14. The antenna structure of claim 13, wherein each of the plurality of extensions is L-shaped.
15. The antenna structure of claim 14, wherein the L-shapes of each of the plurality of extensions are spaced apart by the second gap and are inverted left and right back to back.
16. The antenna structure of claim 1, wherein a thickness of each of the plurality of radiating portions and a thickness of each of the plurality of extensions are between 0.018 millimeters and 0.07 millimeters.
17. The antenna structure of claim 1, further comprising:
the plurality of radiating parts and the plurality of extending parts are configured on the carrier.
18. The antenna structure according to claim 17, characterized in that the shape of the carrier comprises a square or a circle.
19. An antenna structure according to claim 18, characterized in that the side length or diameter of the carrier is between 160 mm and 180 mm.
20. The antenna structure of claim 17, wherein the carrier has a thickness of between 1.5 mm and 2.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022601117.9U CN213636286U (en) | 2020-11-11 | 2020-11-11 | Antenna structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022601117.9U CN213636286U (en) | 2020-11-11 | 2020-11-11 | Antenna structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213636286U true CN213636286U (en) | 2021-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022601117.9U Active CN213636286U (en) | 2020-11-11 | 2020-11-11 | Antenna structure |
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|---|---|
| CN (1) | CN213636286U (en) |
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