CN211507896U - Circularly polarized RFID antenna - Google Patents
Circularly polarized RFID antenna Download PDFInfo
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- CN211507896U CN211507896U CN202020295898.0U CN202020295898U CN211507896U CN 211507896 U CN211507896 U CN 211507896U CN 202020295898 U CN202020295898 U CN 202020295898U CN 211507896 U CN211507896 U CN 211507896U
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- microstrip line
- dielectric plate
- square radiation
- cylindrical feed
- rfid antenna
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Abstract
The utility model discloses a circular polarization RFID antenna, including rectangular conductor ground plate and rectangle dielectric plate, rectangle dielectric plate back-off on the rectangular conductor ground plate, form a rectangle box body structure, have a square radiation microstrip line at the top central authorities fixed mounting of rectangle dielectric plate, seted up circular signal transmission port in the upper left corner of square radiation microstrip line, install cylindrical feed microstrip line on circular signal transmission port. The utility model discloses circular polarized antenna work adopts the single-point feed mode at 2.45GHz, and input impedance is 50 omega, and return loss at resonant frequency 2.45GHz department is-18.8 dB, obtains better antenna impedance.
Description
Technical Field
The utility model relates to a circular polarization RFID antenna belongs to RFID antenna technical field.
Background
With the rise of science, the microstrip antenna technology has become the mainstream of the development of the times, and the RFID microstrip antenna is required to be continuously innovated. The microstrip antenna has one dimension far smaller than the wavelength, so that the antenna has a very low profile (the antenna is thin), which is beneficial to conformal design and ensures excellent aerodynamic characteristics. For a circularly polarized antenna, signals induced by the receiving antenna in any direction are the same (the projection of electromagnetic waves in any direction is the same), so that the sensitivity of the circularly polarized antenna to the antenna direction is reduced, and the circularly polarized antenna is adopted in most occasions.
With the popularization of the microstrip antenna technology, the advantages of the microstrip antenna are gradually shown, and the microstrip antenna is easy to manufacture, small in size, low in cost, easy to conform and suitable for indoor mobile equipment. However, the existing microstrip antenna has a single radiation wave receiving direction, cannot receive radiation waves from any direction, and has a small coverage area and poor universality.
Disclosure of Invention
An object of the utility model is to provide a circular polarization RFID antenna that the appearance is pleasing to the eye small and exquisite, simple manufacture, have circular polarization characteristic, long service life to overcome not enough among the prior art.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a circularly polarized RFID antenna comprises a hollow rectangular dielectric plate, wherein a conductor grounding layer is arranged on the bottom surface of the rectangular dielectric plate, a square radiation microstrip line is embedded in the center of the top surface of the rectangular dielectric plate, a cylindrical feed microstrip line is arranged at the upper left corner of the square radiation microstrip line, the top of the cylindrical feed microstrip line is connected with the square radiation microstrip line, the bottom of the cylindrical feed microstrip line is connected with the conductor grounding layer, and a circular signal transmission port concentric with the cylindrical feed microstrip line is arranged on the conductor grounding layer.
Further, the diameter of the circular signal transmission port is larger than that of the cylindrical feed microstrip line, and the cylindrical feed microstrip line is connected with the inner core of the circular signal transmission port to perform impedance matching, wherein the impedance is 50 Ω.
Furthermore, the rectangular dielectric plate is made of FR-4 material, the dielectric constant of the rectangular dielectric plate is 4.4, and the thickness of the rectangular dielectric plate is 1.6 mm.
Furthermore, the four corners of the square radiation microstrip line are provided with L-shaped gaps, and two L-shaped grooves are symmetrically arranged on the diagonal line of the square radiation microstrip line.
Furthermore, a rectangular groove is formed in the bottom of the rectangular dielectric plate, and the area of the rectangular groove can completely cover the square radiation microstrip line.
Since the technical scheme is used, the utility model discloses an advantage has below: the utility model discloses circular polarized antenna work adopts the single-point feed mode at 2.45GHz, and input impedance is 50 omega, and return loss at resonant frequency 2.45GHz department is-18.8 dB, obtains better antenna impedance.
The description of the figures in the drawings,
fig. 1 is a perspective view of a schematic structural view of the present invention;
fig. 2 is a top view of the structural schematic diagram of the present invention.
FIG. 3 is a schematic structural diagram of a square radiation microstrip line and a cylindrical feed microstrip line
Description of reference numerals: the antenna comprises a rectangular conductor grounding plate 1, a square radiation microstrip line 2, a circular signal transmission port 3, a cylindrical feed microstrip line 4, a rectangular dielectric plate housing 5, an L-shaped notch 6, an L-shaped groove 7 and a rectangular groove 8.
In a particular embodiment, the method comprises the following steps,
the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model provides a: referring to fig. 1 to 3, a circular polarization RFID antenna includes a hollow rectangular dielectric plate 5, a conductor ground plane 1 is disposed on a bottom surface of the rectangular dielectric plate 5, a square radiation microstrip line 2 is embedded in a center of a top surface of the rectangular dielectric plate 5, a cylindrical feed microstrip line 4 is disposed at an upper left corner of the square radiation microstrip line 2, a top of the cylindrical feed microstrip line 4 is connected to the square radiation microstrip line 2, a bottom of the cylindrical feed microstrip line 4 is connected to the conductor ground plane 1, and a circular signal transmission port 3 concentric with the cylindrical feed microstrip line 4 is disposed on the conductor ground plane 1.
The diameter of the circular signal transmission port 3 is larger than that of the cylindrical feed microstrip line 4, and the cylindrical feed microstrip line 4 is connected with the inner core of the circular signal transmission port 3 for impedance matching, wherein the impedance is 50 omega.
The rectangular dielectric plate 5 is made of FR-4 material, the dielectric constant of the rectangular dielectric plate is 4.4, and the thickness of the rectangular dielectric plate is 1.6 mm.
The four corners of the square radiation microstrip line 2 are provided with L-shaped notches 6, two L-shaped grooves 7 are symmetrically formed in the diagonal line of the square radiation microstrip line 2, and the arrangement of the L-shaped notches 6 and the L-shaped grooves 7 can effectively widen the bandwidth of the square radiation microstrip line 2.
A rectangular groove 8 is formed in the bottom of the rectangular dielectric plate 5, and the area of the rectangular groove 8 can completely cover the square radiation microstrip line 2.
To sum up, the utility model discloses circular polarized antenna work adopts the single-point feed mode at 2.45GHz, and input impedance is 50 omega, and the return loss of locating at resonant frequency 2.45GHz is-18.8 dB, obtains better antenna impedance, can receive the radiation wave that comes from arbitrary direction moreover, and coverage is wide, and the universality is strong.
Claims (5)
1. A circularly polarized RFID antenna comprising a hollow rectangular dielectric plate (5), characterized in that: the bottom surface of the rectangular dielectric plate (5) is provided with a conductor grounding layer (1), the center of the top surface of the rectangular dielectric plate (5) is embedded with a square radiation microstrip line (2), the upper left corner of the square radiation microstrip line (2) is provided with a cylindrical feed microstrip line (4), the top of the cylindrical feed microstrip line (4) is connected with the square radiation microstrip line (2), the bottom of the cylindrical feed microstrip line is connected with the conductor grounding layer (1), and the conductor grounding layer (1) is provided with a circular signal transmission port (3) concentric with the cylindrical feed microstrip line (4).
2. The circularly polarized RFID antenna of claim 1, wherein: the diameter of the circular signal transmission port (3) is larger than that of the cylindrical feed microstrip line (4), the cylindrical feed microstrip line (4) is connected with the inner core of the circular signal transmission port (3) to perform impedance matching, and the impedance is 50 omega.
3. The circularly polarized RFID antenna of claim 1, wherein: the rectangular dielectric plate (5) is made of FR-4 material, the dielectric constant of the rectangular dielectric plate is 4.4, and the thickness of the rectangular dielectric plate is 1.6 mm.
4. The circularly polarized RFID antenna of claim 1, wherein: the four corners of the square radiation microstrip line (2) are provided with L-shaped gaps (6), and two L-shaped grooves (7) are symmetrically arranged on the diagonal of the square radiation microstrip line (2).
5. The circularly polarized RFID antenna of claim 1, wherein: a rectangular groove (8) is formed in the bottom of the rectangular dielectric plate (5), and the area of the rectangular groove (8) can completely cover the square radiation microstrip line (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020295898.0U CN211507896U (en) | 2020-03-11 | 2020-03-11 | Circularly polarized RFID antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020295898.0U CN211507896U (en) | 2020-03-11 | 2020-03-11 | Circularly polarized RFID antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211507896U true CN211507896U (en) | 2020-09-15 |
Family
ID=72402579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020295898.0U Expired - Fee Related CN211507896U (en) | 2020-03-11 | 2020-03-11 | Circularly polarized RFID antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211507896U (en) |
-
2020
- 2020-03-11 CN CN202020295898.0U patent/CN211507896U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200915 Termination date: 20210311 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |