CN210092349U - Low-profile slot structure antenna applied to UHF RFID reader - Google Patents
Low-profile slot structure antenna applied to UHF RFID reader Download PDFInfo
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- CN210092349U CN210092349U CN201921318368.7U CN201921318368U CN210092349U CN 210092349 U CN210092349 U CN 210092349U CN 201921318368 U CN201921318368 U CN 201921318368U CN 210092349 U CN210092349 U CN 210092349U
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Abstract
The utility model relates to a low section gap structure antenna applied to UHF RFID reader, which comprises a first medium substrate and a second medium substrate positioned below the first medium substrate, wherein an air space is reserved between the first medium substrate and the second medium substrate; the upper surface of the first dielectric substrate is provided with a grounding plate in an adhering mode, the grounding plate comprises a rectangular annular patch positioned on the periphery and six rectangular patches which are positioned on the inner side of the rectangular annular patch and connected with the rectangular annular patch into a whole, and a T-shaped radiator is adhered to the middle of the inner side of the annular patch; the lower surface of the second medium substrate is pasted with a reflecting plate, and the reflecting plate is provided with a square annular hollow groove. The upper coplanar waveguide of the antenna is designed with a T-shaped radiator, and rectangular patches are loaded at different positions on the inner side of the rectangular annular patch, so that the impedance bandwidth is increased, the UHF RFID frequency band of 902-928MHZ is completely covered, the miniaturization of the antenna is realized, and the section height of the antenna is reduced.
Description
Technical Field
The utility model relates to a be applied to low section gap structure antenna that UHF RFID read ware belongs to wireless communication technical field.
Background
The coplanar waveguide (CPW) feed is a planar transmission line structure, has low profile, light weight, can form surface conformity with other carriers (such as a handset), also has the advantages of low dispersion, easy integration, low transmission loss and the like, and the slot coupling feed structure is widely applied to the design of a broadband circular polarization patch antenna.
Ellis M S, Zhao Z, Wu J et al etch the microstrip feeder on the dielectric copper-clad plate upper surface, the lower surface is the ground plane, short-circuit horizontal strip paster realizes the broadband in the ground plane. Although such antennas have significant advantages in impedance bandwidth and axial ratio bandwidth, they have a bidirectional radiation pattern that does not meet the requirements for directional radiation of UHF RFID reader antennas. Anurag Sethy, Tanmaya Kumar Das and Santan Kumar Behera et al propose coplanar waveguide feed slot structure RFID antenna, the impedance bandwidth of the antenna is 960MHz (713-1673 MHz), the axial ratio bandwidth of high frequency and low frequency is 118MHz (590-708 MHz) and 409MHz (1450-1859 MHz), but the whole size is larger, which is not favorable for the miniaturization of the RFID handheld device.
The microstrip antenna is formed by attaching a very thin conductor metal sheet to a dielectric plate with a conductor grounding plate on the back surface, has the characteristics of small volume, light weight and the like, and the main method for miniaturizing the existing microstrip antenna comprises the following steps: selecting a dielectric substrate with high dielectric constant, adopting a meander technology and a loading technology, and adding a parasitic element. Although these methods can reduce the size of the antenna to some extent, they are accompanied by deterioration of the antenna performance. The dielectric substrate with high dielectric constant is selected in the miniaturization of the microstrip antenna, so that the radiation efficiency of the antenna is reduced, and the gain of the antenna is reduced; the meander technology has a limited degree of reduction of patches; the loading technology inevitably causes the complication of the antenna structure, increases the ohmic impedance and reduces the radiation efficiency of the antenna; the addition of the parasitic element increases the overall volume of the antenna. The coplanar waveguide feed slot structure antenna has wide impedance bandwidth and wide axial ratio bandwidth, but generates bidirectional radiation.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a low-profile slot structure antenna with a low profile height, a small size, and a wide impedance bandwidth for use in a UHF RFID reader.
The utility model discloses a following scheme realizes: a low-profile slot structure antenna applied to a UHF RFID reader comprises a first dielectric substrate and a second dielectric substrate positioned below the first dielectric substrate, wherein an air space is reserved between the first dielectric substrate and the second dielectric substrate; the upper surface of the first dielectric substrate is provided with a grounding plate in an adhering mode, the grounding plate comprises a rectangular annular patch positioned on the periphery and six rectangular patches which are positioned on the inner side of the rectangular annular patch and connected with the rectangular annular patch into a whole, and a T-shaped radiator is adhered to the middle of the inner side of the rectangular annular patch; the lower surface of the second medium substrate is pasted with a reflecting plate, and the reflecting plate is provided with a square annular hollow groove.
Furthermore, six rectangular patches are respectively a first rectangular patch located at the left edge of the inner side of the rectangular annular patch, a second rectangular patch located at the right corner of the left rear of the inner side of the rectangular annular patch, a third rectangular patch located at the rear edge of the inner side of the rectangular annular patch, a fourth rectangular patch located at the right rear corner of the inner side of the rectangular annular patch, a fifth rectangular patch located at the right edge of the inner side of the rectangular annular patch and a sixth rectangular patch located at the right front corner of the inner side of the rectangular annular patch.
Furthermore, the T-shaped radiator comprises a seventh rectangular patch and an eighth rectangular patch located beside the seventh rectangular patch, a notch is formed in the middle of the front portion of the rectangular annular patch, the front end of the seventh rectangular patch is provided with an extending portion which penetrates out of the notch and is connected with the SMA connector located on the front side of the first medium substrate, and gaps are reserved between two sides of the extending portion of the seventh rectangular patch and two sides of the notch.
Further, the peripheral size of the rectangular annular patch is 89.3mm by 89.3mm, and the sizes of the first rectangular patch, the second rectangular patch, the third rectangular patch, the fourth rectangular patch, the fifth rectangular patch and the sixth rectangular patch are 22.9mm by 11.5mm, 19.5mm by 19.5mm, 18.3mm by 13.8mm, 11.5mm by 3.5mm, 41.2mm by 16mm and 25.2mm by 6.9mm respectively; the sizes of the seventh rectangular patch and the eighth rectangular patch of the T-shaped radiator are 41.2mm by 11.5mm and 9.2mm by 9.2mm respectively; the size of the reflecting plate is 105mm by 105mm, and the inner and outer peripheral sizes of the square annular hollow groove are 68.7mm by 68.7mm and 55mm by 55mm respectively; and an air space of 10mm is reserved between the first dielectric substrate and the second dielectric substrate.
Furthermore, screw holes are formed in four right angles of the first dielectric substrate and the second dielectric substrate.
Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses the antenna designs T type radiator at upper coplanar waveguide, connects inboard different positions at the annular paster of rectangle and loads the rectangle paster, is favorable to increasing the impedance bandwidth, and the performance is good, covers 902 ability 928 MHZ's UHF RFID frequency channel completely; the lower reflecting surface adopts a structure of a square annular hollow groove, so that the impedance bandwidth is increased, and the miniaturization of the antenna is realized; the air space between the upper dielectric substrate and the lower dielectric substrate is favorable for reducing the profile height of the antenna.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and related drawings.
Drawings
FIG. 1 is a perspective view of an embodiment of the present invention;
fig. 2 is a front view of an embodiment of the present invention;
fig. 3 is a top view of an embodiment of the present invention;
fig. 4 is a bottom view of the embodiment of the present invention;
fig. 5 is a diagram of a simulation result of the reflection coefficient of the antenna according to the embodiment of the present invention;
fig. 6 is an XOZ plane directional diagram when the antenna of the embodiment of the present invention is f =915 MHz;
the reference numbers in the figures illustrate: 1-a first dielectric substrate, 2-a second dielectric substrate, 3-an SMA connector, 4-a rectangular annular patch, 41-a first rectangular patch, 42-a second rectangular patch, 43-a third rectangular patch, 44-a fourth rectangular patch, 45-a fifth rectangular patch, 46-a sixth rectangular patch, 47-a notch, 5-T type radiator, 51-a seventh rectangular patch, 52-an eighth rectangular patch, 53-an extension part, 6-a screw hole, 7-a reflector plate, 71-a square annular hollow groove and 8-an air gap.
Detailed Description
As shown in fig. 1 to 4, a low-profile slot structure antenna applied to a UHF RFID reader includes a first dielectric substrate 1 and a second dielectric substrate 2 located below the first dielectric substrate 1, wherein an air space 8 is left between the first dielectric substrate 1 and the second dielectric substrate 2; the upper surface of the first dielectric substrate 1 is provided with a ground plate in an adhering mode, the ground plate comprises a rectangular annular patch 4 positioned on the periphery and six rectangular patches which are positioned on the inner side of the rectangular annular patch and connected with the rectangular annular patch into a whole, and a T-shaped radiator 5 is adhered to the middle of the inner side of the rectangular annular patch 4; a reflecting plate 7 is attached to the lower surface of the second medium substrate 2, and a square annular hollow groove 71 is formed in the reflecting plate; the T-shaped radiator 5 and the grounding plate are antenna main body parts and are printed on the upper surface of the first dielectric substrate 1 together, and the reflecting plate 7 is printed on the lower surface of the second dielectric substrate 2 and is used for realizing directional radiation of the antenna; the T-shaped radiator 5, the grounding plate and the reflecting plate 7 are all made of metal materials; the antenna is provided with the T-shaped radiator on the upper coplanar waveguide, and the rectangular patches are loaded at different positions on the inner side of the rectangular annular patch, so that the impedance bandwidth is increased, and the UHF RFID frequency band of 902-928MHZ is completely covered; the lower reflecting surface adopts a structure of a square annular hollow groove, so that the impedance bandwidth is increased, and the miniaturization of the antenna is realized; the air space between the upper dielectric substrate and the lower dielectric substrate is favorable for reducing the profile height of the antenna.
In this embodiment, the six rectangular patches are respectively a first rectangular patch 41 located at the left edge of the inner side of the rectangular ring patch, a second rectangular patch 42 located at the right angle of the left back of the inner side of the rectangular ring patch, a third rectangular patch 43 located at the back edge of the inner side of the rectangular ring patch, a fourth rectangular patch 44 located at the right back right angle of the inner side of the rectangular ring patch, a fifth rectangular patch 45 located at the right edge of the inner side of the rectangular ring patch, and a sixth rectangular patch 46 located at the right front angle of the inner side of the rectangular ring patch; the rectangular patches are loaded at different positions on the inner side of the rectangular annular patch of the grounding plate, the impedance bandwidth of the antenna is increased by utilizing coupling, and the miniaturization of the antenna is realized.
In this embodiment, the T-shaped radiator 5 includes a seventh rectangular patch 51 and an eighth rectangular patch 52 located beside the seventh rectangular patch, a notch 47 is formed in the middle of the front portion of the rectangular annular patch, the front end of the seventh rectangular patch has an extension portion 53 that penetrates through the notch and is connected to the SMA connector located on the front side of the first dielectric substrate, and gaps are left between two sides of the extension portion of the seventh rectangular patch and two sides of the notch.
In this embodiment, the outer peripheral dimensions of the rectangular annular patches are 89.3mm by 89.3mm, and the dimensions of the first rectangular patch, the second rectangular patch, the third rectangular patch, the fourth rectangular patch, the fifth rectangular patch and the sixth rectangular patch are 22.9mm by 11.5mm, 19.5mm by 19.5mm, 18.3mm by 13.8mm, 11.5mm by 3.5mm, 41.2mm by 16mm and 25.2mm by 6.9mm, respectively; the sizes of the seventh rectangular patch and the eighth rectangular patch of the T-shaped radiator are 41.2mm by 11.5mm and 9.2mm by 9.2mm respectively; the size of the reflecting plate is 105mm by 105mm, and the inner and outer peripheral sizes of the square annular hollow groove are 68.7mm by 68.7mm and 55mm by 55mm respectively; and an air space of 10mm is reserved between the first dielectric substrate and the second dielectric substrate.
In this embodiment, the first dielectric substrate and the second dielectric substrate are provided with screw holes 6 at four right angles.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.
The utility model discloses if disclose or related to mutual fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (5)
1. The utility model provides a be applied to low section slot structure antenna of UHF RFID reader which characterized in that: the dielectric substrate comprises a first dielectric substrate and a second dielectric substrate positioned below the first dielectric substrate, wherein an air interval is reserved between the first dielectric substrate and the second dielectric substrate; the upper surface of the first dielectric substrate is provided with a grounding plate in an adhering mode, the grounding plate comprises a rectangular annular patch positioned on the periphery and six rectangular patches which are positioned on the inner side of the rectangular annular patch and connected with the rectangular annular patch into a whole, and a T-shaped radiator is adhered to the middle of the inner side of the rectangular annular patch; the lower surface of the second medium substrate is pasted with a reflecting plate, and the reflecting plate is provided with a square annular hollow groove.
2. The antenna with low-profile slot structure applied to UHF RFID reader of claim 1, wherein: the six rectangular patches are respectively a first rectangular patch positioned at the left edge of the inner side of the rectangular annular patch, a second rectangular patch positioned at the right corner of the left back of the inner side of the rectangular annular patch, a third rectangular patch positioned at the rear edge of the inner side of the rectangular annular patch, a fourth rectangular patch positioned at the right back of the inner side of the rectangular annular patch, a fifth rectangular patch positioned at the right edge of the inner side of the rectangular annular patch and a sixth rectangular patch positioned at the right front of the inner side of the rectangular annular patch.
3. The antenna with low-profile slot structure applied to UHF RFID reader of claim 2, wherein: the T-shaped radiator comprises a seventh rectangular patch and an eighth rectangular patch located beside the seventh rectangular patch, a notch is formed in the middle of the front portion of the rectangular annular patch, an extending portion which penetrates out of the notch and is connected with the SMA connector located on the front side of the first medium substrate is arranged at the front end of the seventh rectangular patch, and gaps are reserved between two sides of the extending portion of the seventh rectangular patch and two sides of the notch.
4. The antenna with low-profile slot structure applied to UHF RFID reader of claim 3, wherein: the peripheral size of the rectangular annular patch is 89.3mm by 89.3mm, and the sizes of the first rectangular patch, the second rectangular patch, the third rectangular patch, the fourth rectangular patch, the fifth rectangular patch and the sixth rectangular patch are 22.9mm by 11.5mm, 19.5mm by 19.5mm, 18.3mm by 13.8mm, 11.5mm by 3.5mm, 41.2mm by 16mm and 25.2mm by 6.9mm respectively; the sizes of the seventh rectangular patch and the eighth rectangular patch of the T-shaped radiator are 41.2mm by 11.5mm and 9.2mm by 9.2mm respectively; the size of the reflecting plate is 105mm by 105mm, and the inner and outer peripheral sizes of the square annular hollow groove are 68.7mm by 68.7mm and 55mm by 55mm respectively; and an air space of 10mm is reserved between the first dielectric substrate and the second dielectric substrate.
5. The antenna with low-profile slot structure applied to UHF RFID reader of claim 1, wherein: screw holes are formed in four right-angle positions of the first dielectric substrate and the second dielectric substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921318368.7U CN210092349U (en) | 2019-08-15 | 2019-08-15 | Low-profile slot structure antenna applied to UHF RFID reader |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921318368.7U CN210092349U (en) | 2019-08-15 | 2019-08-15 | Low-profile slot structure antenna applied to UHF RFID reader |
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| CN210092349U true CN210092349U (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921318368.7U Active CN210092349U (en) | 2019-08-15 | 2019-08-15 | Low-profile slot structure antenna applied to UHF RFID reader |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114639963A (en) * | 2022-04-06 | 2022-06-17 | 合肥若森智能科技有限公司 | Multi-band dual-circular-polarization omnidirectional antenna |
-
2019
- 2019-08-15 CN CN201921318368.7U patent/CN210092349U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114639963A (en) * | 2022-04-06 | 2022-06-17 | 合肥若森智能科技有限公司 | Multi-band dual-circular-polarization omnidirectional antenna |
| CN114639963B (en) * | 2022-04-06 | 2024-03-29 | 合肥若森智能科技有限公司 | Multi-band double circular polarization omnidirectional antenna |
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