CN220821922U - Circularly polarized wide-beam microstrip antenna with stable phase center - Google Patents
Circularly polarized wide-beam microstrip antenna with stable phase center Download PDFInfo
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- CN220821922U CN220821922U CN202322575895.9U CN202322575895U CN220821922U CN 220821922 U CN220821922 U CN 220821922U CN 202322575895 U CN202322575895 U CN 202322575895U CN 220821922 U CN220821922 U CN 220821922U
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- 230000005855 radiation Effects 0.000 claims abstract description 55
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 239000000523 sample Substances 0.000 claims description 14
- 239000004020 conductor Substances 0.000 claims description 3
- 230000010287 polarization Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 238000005388 cross polarization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
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Abstract
The utility model discloses a circularly polarized wide beam microstrip antenna with a stable phase center, which comprises: the upper surface and the lower surface of the dielectric substrate are respectively provided with a radiation patch and a grounding plate; the two diagonal lines of the radiation patch are respectively hollowed with a pair of circular grooves with the same radius, the two pairs of circular grooves on the two diagonal lines are different in radius, and the midvertical lines of the two opposite sides of the radiation patch are respectively provided with a pair of rectangular grooves. A pair of rectangular grooves with the same size are respectively formed in the middles of two opposite sides of the radiation patch, the axial ratio beam width of the antenna is increased, two pairs of circular grooves with different radiuses are hollowed out in the two diagonal lines, the circular polarization radiation characteristic of the antenna is achieved, and the characteristic of the stable phase center of a radiation field is achieved through the symmetrical design of the radiation patch structure.
Description
Technical Field
The utility model relates to the technical field of antennas, in particular to a circularly polarized wide-beam microstrip antenna with a stable phase center.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Along with the wide application of advanced radio systems such as RFID and positioning technology, beidou system and the like, the engineering requirements on accurate positioning and direction finding are increasingly improved, and the influence of the stability of an antenna phase center on the measurement precision of the system is not negligible, so that the design of an antenna with high phase center stability is increasingly emphasized. On the other hand, according to the role played by the antenna in the system, the contribution of the signal in the low elevation direction to the positioning accuracy is the largest, and the gain of the antenna in the low elevation direction is often small, so that the continuous improvement of the positioning accuracy also places higher requirements on the 3dB axis of the antenna than the beam width.
The method for expanding the beam of the microstrip antenna adopts a special ground structure, increases the ground electric size, increases the parasitic structure and the like, but the methods increase the antenna volume to different degrees and improve the design complexity. Common methods for realizing circularly polarized radiation by the single-point feed microstrip antenna have schemes of angle-cutting perturbation, loading perturbation, asymmetric excitation and the like, but the radiation structures are obviously asymmetric to a feed point, so that a relatively stable phase center cannot be realized.
Disclosure of utility model
In order to solve the above problems, the utility model provides a circularly polarized wide beam microstrip antenna with a stable phase center, wherein a pair of rectangular grooves are respectively formed on the middlelines of two opposite sides of a radiation patch, the axial ratio beam width of the antenna is increased, two pairs of circular grooves with different radiuses are hollowed out on two diagonal lines, the circular polarized radiation characteristic of the antenna is realized, and the stable phase center characteristic of a radiation field is realized through the symmetrical design of a radiation patch structure.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
The utility model provides a circularly polarized wide beam microstrip antenna with a stable phase center, which comprises: the radiation patch comprises a dielectric substrate, a radiation patch arranged on one side surface of the dielectric substrate and a grounding plate arranged on the other side surface of the dielectric substrate; the two diagonal lines of the radiation patch are respectively hollowed with a pair of circular grooves with the same radius, the two pairs of circular grooves on the two diagonal lines are different in radius, and the midvertical lines of the two opposite sides of the radiation patch are respectively provided with a pair of rectangular grooves.
Alternatively, both pairs of rectangular slots are the same size.
As an alternative embodiment, four rectangular slots are symmetrically arranged with respect to the geometric center of the radiating patch.
As an alternative embodiment, the four circular grooves are symmetrically arranged with respect to the geometric center of the radiating patch.
As an alternative embodiment, the minimum distance from the center of the four circular grooves to the edge of the radiation patch is 6.45mm.
As an alternative embodiment, a coaxial probe feed port is further provided on the other side of the dielectric substrate, and a conductor in the coaxial probe feed line alternates with the radiation patch at the feed point.
Alternatively, the radiating patch is square.
Alternatively, the dielectric substrate is square.
As an alternative embodiment, the rectangular slot has the following dimensions: the length is 8.56mm and the width is 1.5mm.
Alternatively, the radii of the two pairs of circular grooves are 5mm and 4.08mm, respectively.
Compared with the prior art, the utility model has the beneficial effects that:
The utility model provides a circularly polarized wide beam microstrip antenna with a stable phase center, which is characterized in that a pair of rectangular grooves with the same size are respectively formed in the middlelines of two opposite sides of a radiation patch, four rectangular grooves with the same size are formed in total, the four rectangular grooves with the same size are symmetrically arranged relative to the geometric center of the radiation patch, the equivalent electric size of the radiation patch is reduced, the axial ratio beam width of the antenna is increased, and the wide bandwidth beam performance of the antenna is realized.
The utility model provides a circularly polarized wide beam microstrip antenna with a stable phase center, which is characterized in that a pair of circular grooves with the same radius are respectively hollowed out on two diagonal lines of a radiation patch, the geometric center of each pair of circular grooves is positioned on the diagonal line of the radiation patch, and the radii of the two pairs of circular grooves on the two diagonal lines are different, so that the perturbation of a radiation field is realized, a pair of spatially orthogonal linearly polarized waves with 90-degree phase difference are formed, namely, the circularly polarized radiation is generated, and the characteristic of the circularly polarized radiation of the antenna is realized.
The utility model provides a circularly polarized wide-beam microstrip antenna with a stable phase center, wherein four rectangular grooves with the same size are symmetrically arranged relative to the geometric center of a radiation patch, and four circular grooves are symmetrically arranged relative to the geometric center of the radiation patch.
The antenna has high phase center stability, wide axial ratio beam width and low profile structure, can meet the circular polarization working requirements of miniaturization, low cost and easy integration, and can be used in the fields of radio frequency identification positioning systems, satellite navigation and positioning systems, wireless local area networks and the like.
Additional aspects of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.
Fig. 1 is a front view of a circularly polarized wide beam microstrip antenna with a stable phase center provided in embodiment 1 of the present utility model;
fig. 2 is a side view of a circularly polarized wide beam microstrip antenna with a stable phase center according to embodiment 1 of the present utility model;
FIG. 3 is a graph showing the relationship between the impedance bandwidth and the frequency of the circularly polarized wide beam microstrip antenna according to embodiment 1 of the present utility model;
Fig. 4 is a graph showing the relationship between the axial ratio and the frequency of the circularly polarized wide beam microstrip antenna according to embodiment 1 of the present utility model;
fig. 5 is a graph of the relationship between the gain and the frequency of the circularly polarized wide beam microstrip antenna according to embodiment 1 of the present utility model;
fig. 6 is an antenna pattern at a frequency point of 2.45GHz of the circularly polarized wide beam microstrip antenna provided in embodiment 1 of the present utility model;
Fig. 7 is a graph of a 3dB axial ratio beamwidth at a 2.45GHz frequency point of the circularly polarized wide-beam microstrip antenna provided in embodiment 1 of the present utility model;
Fig. 8 is a far-field phase pattern at a frequency point of 2.45GHz of the circularly polarized wide-beam microstrip antenna provided in embodiment 1 of the present utility model;
The coaxial probe comprises a dielectric substrate, a radiation patch, a feeding point, a first circular groove, a second circular groove, a rectangular groove, a grounding plate, a coaxial probe feeding port and a coaxial probe feeding port, wherein the dielectric substrate, the radiation patch, the feeding point, the first circular groove, the second circular groove, the rectangular groove, the grounding plate and the coaxial probe feeding port are arranged in sequence, and the coaxial probe feeding port is arranged in the first circular groove, the second circular groove, the rectangular groove, the grounding plate and the coaxial probe feeding port.
Detailed Description
The utility model is further described below with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular forms also are intended to include the plural forms, and furthermore, it is to be understood that the terms "comprises" and "comprising" and any variations thereof are intended to cover non-exclusive inclusions, e.g., processes, methods, systems, products or devices that comprise a series of steps or units, are not necessarily limited to those steps or units that are expressly listed, but may include other steps or units that are not expressly listed or inherent to such processes, methods, products or devices.
Embodiments of the utility model and features of the embodiments may be combined with each other without conflict.
Example 1
As shown in fig. 1, the present embodiment provides a circularly polarized wide beam microstrip antenna with a stable phase center, including: a dielectric substrate 1, a radiation patch 2 arranged on one side surface of the dielectric substrate 1, and a grounding plate 7 arranged on the other side surface of the dielectric substrate 1; the two diagonal lines of the radiation patch 2 are respectively hollowed with a pair of circular grooves with the same radius, the two pairs of circular grooves on the two diagonal lines are different in radius, and the midvertical lines of the two opposite sides of the radiation patch 2 are respectively provided with a pair of rectangular grooves 6.
In this embodiment, the grounding plate 7 is a metal grounding plate and is disposed on the lower surface of the dielectric substrate 1, the antenna is fed by using a coaxial probe, the coaxial probe feeding port 8 is disposed on the lower surface of the dielectric substrate 1, the inner conductor of the coaxial probe feeding line is connected to the radiation patch 2 at the feeding point 3, and the radiation patch 2 is excited by the coaxial probe, as shown in fig. 2.
As an alternative embodiment, the feeding point 3 is 3.95mm from the geometrical centre of the radiating patch 2.
In this embodiment, the radiation patch 2 is square, and has a side length of 29.5mm.
In this embodiment, a pair of rectangular grooves 6 with the same size are respectively formed on the middle vertical lines of two opposite sides of the radiation patch 2, and four rectangular grooves 6 with the same size are totally formed, and the four rectangular grooves 6 with the same size are symmetrically arranged relative to the geometric center of the radiation patch 2; through four rectangular grooves with the same size which are symmetrically arranged, the equivalent electric size of the radiation patch is reduced, the axial ratio beam width of the antenna is increased, and the 3dB beam width at the central working frequency is 186 degrees.
As an alternative embodiment, the rectangular slot 6 has a dimension of 8.56mm long and 1.5mm wide.
In this embodiment, a pair of circular grooves with the same radius are respectively hollowed out on two diagonal lines of the radiation patch 2, and the radii of the two pairs of circular grooves on the two diagonal lines are different, such as a first circular groove 4 and a second circular groove 5 in fig. 1, and the four circular grooves are symmetrically arranged relative to the geometric center of the radiation patch 2.
As an alternative embodiment, the radius of the first circular groove 4 is 5mm, and the radius of the second circular groove 5 is 4.08mm.
As an alternative embodiment, the minimum distance from the center of the four circular grooves to the edge of the radiation patch is the same, and the minimum distance is set to be 6.45mm.
According to the embodiment, two pairs of circular grooves with different radiuses are hollowed out on the radiation patch, so that the geometric center of each pair of circular grooves is positioned on the diagonal line of the radiation patch, and the perturbation of a radiation field is realized by adjusting the radiuses of the two pairs of circular grooves, so that a pair of linear polarized waves with 90-degree phase difference in space orthogonality are formed, namely circular polarized radiation is generated, and the characteristic of the circular polarized radiation of the antenna is realized; through two pairs of circular grooves and two pairs of rectangular grooves which are symmetrically arranged, the symmetry of the antenna structure is realized, and the stability of the phase center of the radiation field is improved.
In this embodiment, the dielectric substrate 1 is square, has a side length of 50.5mm and a thickness of 2mm, and is made of an F4b-2 high-frequency dielectric material having a relative permittivity of 2.65, and has a loss tangent of 0.003.
The embodiment provides a circularly polarized wide-beam microstrip antenna with a stable phase center, the center frequency is 2.45GHz, the microstrip antenna is used as a base, feeding and radiation are integrated, the structure is simple, the printed circuit process is utilized for production, and the circularly polarized wide-beam microstrip antenna has the advantages of low profile, small volume, light weight, high precision, low cost and the like; compared with a general satellite navigation microstrip antenna, the antenna has larger axial ratio beam width and lower cross polarization level, and can enable a satellite navigation system to capture satellite signals more efficiently and obtain the optimal positioning effect.
The performance of the antenna is analyzed as follows.
As shown in fig. 3-5, the antenna has an axial ratio of less than 3dB and a gain of higher than 4dBi in the bandwidth range of 2.42-2.48 GHz.
As shown in fig. 6, which shows the antenna pattern at the 2.45GHz frequency point, it can be seen that the cross polarization of the antenna is below 23.6dB.
As shown in figure 7 at the 2.45GHz frequency point,The 3dB axial ratio beam width curve graphs of 0 DEG and 90 DEG can be seen that engineering applications with the axial ratio smaller than 3dB are satisfied in the range of-100 DEG to 86 DEG of pitch angle.
As shown in FIG. 8, which shows the far field phase pattern at the 2.45GHz frequency point, it can be seen that, atOn the reference plane, the phase position when the pitch angle is 0 degree is minus 5 degrees, the phase position when the pitch angle is +/-60 degrees is minus 12 degrees, the phase position is 7 degrees, the phase position when the pitch angle is +/-86 degrees is minus 18.7 degrees, and the phase position is 13.7 degrees; at/>On the reference plane, the phase position when the pitch angle is 0 degree is minus 95 degrees, the phase position when the pitch angle is +/-60 degrees is minus 100.7 degrees, the phase position is 5.7 degrees, the phase position when the pitch angle is +/-86 degrees is minus 104.9 degrees, and the phase position is 9.9 degrees. /(I)Phase sum/> on reference planeThe phase difference on the reference plane is 90 degrees, and the phase difference is very small in the required main radiation angle range, so that the antenna phase center is stable.
While the foregoing description of the embodiments of the present utility model has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the utility model, but rather, it is intended to cover all modifications or variations within the scope of the utility model as defined by the claims of the present utility model.
Claims (10)
1. A circularly polarized wide beam microstrip antenna having a stable phase center, comprising: the radiation patch comprises a dielectric substrate, a radiation patch arranged on one side surface of the dielectric substrate and a grounding plate arranged on the other side surface of the dielectric substrate; the two diagonal lines of the radiation patch are respectively hollowed with a pair of circular grooves with the same radius, the two pairs of circular grooves on the two diagonal lines are different in radius, and the midvertical lines of the two opposite sides of the radiation patch are respectively provided with a pair of rectangular grooves.
2. A circularly polarized wide beam microstrip antenna with a stable phase center as in claim 1 wherein the dimensions of both pairs of rectangular slots are the same.
3. A circularly polarized wide beam microstrip antenna with a stable phase center as in claim 1 wherein the four rectangular slots are symmetrically disposed with respect to the geometric center of the radiating patch.
4. A circularly polarized wide beam microstrip antenna with a stable phase center as in claim 1 wherein the four circular slots are symmetrically disposed with respect to the geometric center of the radiating patch.
5. A circularly polarized wide beam microstrip antenna with stable phase center as in claim 1 wherein the minimum distance from the center of the four circular slots to the edge of the radiating patch is 6.45mm.
6. The circularly polarized wide beam microstrip antenna with stable phase center as in claim 1, further comprising a coaxial probe feed port on the other side of the dielectric substrate, the conductor in the coaxial probe feed line intersecting the radiating patch at the feed point.
7. A circularly polarized wide beam microstrip antenna with a stable phase center as in claim 1 wherein said radiating patch is square.
8. The circularly polarized wide beam microstrip antenna with stable phase center of claim 1 wherein said dielectric substrate is square.
9. A circularly polarized wide beam microstrip antenna with a stable phase center as in claim 1 wherein said rectangular slot has dimensions of: the length is 8.56mm and the width is 1.5mm.
10. A circularly polarized wide beam microstrip antenna with a stable phase center as in claim 1 wherein the radii of the two pairs of circular slots are 5mm and 4.08mm, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322575895.9U CN220821922U (en) | 2023-09-21 | 2023-09-21 | Circularly polarized wide-beam microstrip antenna with stable phase center |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322575895.9U CN220821922U (en) | 2023-09-21 | 2023-09-21 | Circularly polarized wide-beam microstrip antenna with stable phase center |
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| Publication Number | Publication Date |
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| CN220821922U true CN220821922U (en) | 2024-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322575895.9U Active CN220821922U (en) | 2023-09-21 | 2023-09-21 | Circularly polarized wide-beam microstrip antenna with stable phase center |
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| Country | Link |
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| CN (1) | CN220821922U (en) |
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- 2023-09-21 CN CN202322575895.9U patent/CN220821922U/en active Active
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