CN114709609B - Circularly polarized microstrip antenna of low-profile high-gain wide-axial-ratio beam - Google Patents
Circularly polarized microstrip antenna of low-profile high-gain wide-axial-ratio beam Download PDFInfo
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- H—ELECTRICITY
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- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
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- H—ELECTRICITY
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/106—Microstrip slot antennas
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Abstract
The invention discloses a circularly polarized microstrip antenna with low profile, high gain and wide axial ratio beam. The structure is that on the basis of the traditional microstrip patch antenna, slits are formed on the surface of the radiating patch in the diagonal direction, so that current on the patch flows along the slot edge, the path of the current becomes longer, which is equivalent to inductance cascading, and the resonant frequency of the antenna is reduced. In addition, the parasitic capacitance of the slot and the parasitic inductance of the via hole can be equivalently used as an LC circuit and used for adjusting the double resonance frequency points excited by the antenna on the working frequency band, reducing the frequency ratio while ensuring the generation of a 90-degree phase difference, and obtaining the circular polarized wave of a wider axial ratio wave beam. Structurally, the antenna is quite symmetrical in whole, unnecessary coupling interference can be reduced, and the 3-dB axial ratio beam symmetry of the antenna is optimized. In addition, the antenna is relatively simple in structure, remarkable in effect and easy to implement.
Description
Technical Field
The invention belongs to the technical field of circularly polarized microstrip antennas, and particularly relates to a circularly polarized microstrip antenna with low profile, high gain and wide axial ratio, in particular to a circularly polarized microstrip antenna capable of realizing low profile, high gain and wide axial ratio on a WIFI frequency band.
Background
With the rapid development of wireless communication technology, the linear polarization antenna is insufficient to meet the demands of people in various application occasions, different demands are put on the performance and the form of the antenna, and the circular polarization antenna can receive electromagnetic waves with any polarization by virtue of the unique polarization characteristics, and can also receive radiation waves emitted by the circular polarization antenna, so that the circular polarization antenna plays an increasingly important role in many wireless applications.
Two common feed types for circularly polarized antennas: single-feed type and double-feed type. Obviously, the single feed antenna is easier to manufacture, because it can realize 90 DEG phase difference without external feed network by introducing geometric disturbance, is beneficial to miniaturization design of the antenna, is easier to integrate, and is also more suitable for wireless communication systems. The transceiver antennas of modern wireless communication systems mostly adopt circularly polarized antennas, which benefit from their unique polarization characteristics, and also have extremely strong anti-interference capability. The linear polarization antenna is easy to generate polarization deflection in the transmission process to cause signal attenuation, and the rotation direction of polarized waves emitted by the circular polarization antenna is reversed when the polarized waves are incident to a symmetrical target (such as a plane, a spherical surface and the like), and electromagnetic waves with different rotation directions have larger value of polarization isolation, which means that the circular polarization antenna can remarkably reduce the problems caused by polarization mismatch and multipath interference between the receiving and transmitting antennas.
The basic principle of radiation of the circularly polarized patch antenna is to generate two mutually perpendicular linearly polarized electric field components, then make the amplitudes equal, and the phase difference is 90 degrees, so that ar=0 dB can be theoretically achieved, but in practical engineering application, no complete circularly polarization exists, and the axial ratio is generally required to be no more than 3 dB.
The reported single feed circularly polarized antennas, the wide axis ratio bandwidth, is mostly the more important indicator for antenna designers, but often ignores another important indicator, the axial ratio beamwidth. The axial ratio beam of a conventional microstrip antenna is very narrow due to its high frequency ratio. For single-layer circularly polarized patch antennas, parasitic structures are generally introduced to improve the 3-dB axial ratio beam width, such as square rings, T-slots, and the like. While this approach may relatively increase the axial beamwidth, it may in turn decrease the impedance bandwidth and antenna gain. In addition, some take the form of folded dipoles, however, this approach results in a narrower 3-dB half-power beamwidth and a relatively larger antenna structure. In order to improve the integration of devices, a miniaturized circularly polarized antenna with a wide axis and a high gain than a beam is attracting attention.
Disclosure of Invention
The invention mainly aims at overcoming the defects of the prior art, and provides a circularly polarized microstrip antenna with low profile, high gain and wide axial ratio beam. In addition, the parasitic capacitance of the introduced gap and the parasitic inductance of the via hole can be equivalently used as an LC circuit for adjusting double resonance frequency points, so that the frequency ratio is reduced while the 90-degree phase difference is ensured to be generated, and the purpose of wider axial ratio beam bandwidth is achieved. It is worth mentioning that the patch slot and the two pairs of via patches introduced do not increase the antenna size, and the method is simple in structure, remarkable in effect and easy to implement.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a circularly polarized microstrip antenna with low profile, high gain and wide axial ratio beam comprises
A dielectric substrate (1);
a radiation patch (2) which is positioned on the upper surface of the dielectric substrate (1);
a system floor (3) located on the lower surface of the dielectric substrate (1);
a coaxial feed port (8) which is mutually perpendicular to the radiating patch (2) and the system floor (3);
the radiation patch (2) is of a square structure, a notch is formed in the center of each of four sides of the radiation patch, and a metal patch is arranged at each notch; the metal patch is provided with a via hole, and the via hole realizes that the metal patch is connected with a system floor (3); a gap is reserved between the metal patch and the radiation patch (2);
the radiation patch (2) is provided with a rectangular groove column (4); the rectangular groove column (4) comprises a second rectangular groove (6), a third rectangular groove (16), a fifth rectangular groove (7) and a sixth rectangular groove (15) which are not contacted with each other; the center lines of the second rectangular groove (6) and the third rectangular groove (16) are positioned on the same straight line, and the second rectangular groove (6) and the third rectangular groove (16) are arranged in a central symmetry mode relative to the center of the radiation patch (2); the fifth rectangular groove (7) and the sixth rectangular groove (15) are symmetrically arranged about the straight line axis where the second rectangular groove (6) and the third rectangular groove (16) are positioned; the straight lines of the second rectangular grooves (6) and the third rectangular grooves (16) are overlapped with the diagonal line of the radiation patch (2); the fifth rectangular groove (7) and the sixth rectangular groove (15) are arranged in parallel with the straight lines where the second rectangular groove (6) and the third rectangular groove (16) are;
preferably, the rectangular groove column (4) further comprises a first rectangular groove (5) and a fourth rectangular groove (17) which are not contacted with each other, and the first rectangular groove (5) and the fourth rectangular groove (17) are positioned at two ends of a straight line where the second rectangular groove (6) and the third rectangular groove (16) are positioned;
preferably, the distance between the through holes of the two metal patches opposite to the radiation patch (2) and the center of the radiation patch (2) is the same; but the distance between the through holes of the adjacent metal patches and the center of the radiation patch is different;
preferably, the width of the gap between each metal patch and the two walls of the notch is equal;
preferably, the radiation patch (2) is positioned at the right center of the upper surface of the dielectric substrate (1);
preferably, the two metal patches positioned opposite to the radiation patch (2) are equal in width with the gap of the radiation patch (2);
preferably, the two metal patches positioned opposite to the radiation patch (2) are the same size;
preferably, the radiation patch (2) has a central symmetrical structure, the first rectangular groove (5) and the fourth rectangular groove (17) have the same size, the second rectangular groove (6) and the third rectangular groove (16) have the same size, and the fifth rectangular groove (7) and the sixth rectangular groove (15) have the same size;
preferably, the coaxial feed port (8) is arranged between the metal patch and the antenna radiation patch gap, and the third rectangular groove (16) and the fifth rectangular groove (7);
preferably, the groove widths of the second rectangular groove (6), the third rectangular groove (16), the fifth rectangular groove (7), the sixth rectangular groove (15), the first rectangular groove (5) and the fourth rectangular groove (17) are smaller than 0.01 working wavelength;
preferably, the centers of the through holes (13) on the two metal patches opposite to the radiation patch (2), the center of the long side of the metal patch where the current through hole (13) is located, and the center of the radiation patch (2) are all positioned on the same straight line.
Working principle:
the rectangular groove columns (4) arranged along the diagonal lines on the radiation patch (2) are composed of a first rectangular groove (5), a second rectangular groove (6), a third rectangular groove (16), a fourth rectangular groove (17), a fifth rectangular groove (7) and a sixth rectangular groove (15). The slotting on the patch cuts off the original surface current path, increases the 'flow path' of the surface current of the patch, and is equivalent to introducing cascading inductance in the equivalent circuit of the antenna. Due to the narrow slotIt can be modeled as an infinitely thin transverse magnetic wall inserted into the patch such that the induced current is mostly concentrated near the slot. The grooves along the diagonal direction can control the surface current of the patch to excite the polarized degenerate mode with the phase difference of 90 degrees according to the dual principle of magnetic current, thereby better realizing circularly polarized radiation. The second rectangular groove (6) and the third rectangular groove (16) are symmetrical about the center, on the one hand, in order to obtain a more symmetrical circularly polarized wave, and on the other hand, in order to reduce the frequency ratio of the dual resonance frequencies, a lower frequency ratio can obtain a better circularly polarized beam width. On the basis, the symmetrical first rectangular groove (5) and the fourth rectangular groove (17) are added, so that the length of the narrow slit can be lengthened and the circular polarization performance can be optimized under the condition that the second rectangular groove (6) and the third rectangular groove (16) are not influenced as much as possible. The rectangular slots are equivalent to a plurality of pairs of magnetic dipoles, so that current on the patch is mainly concentrated around the rectangular slots, and the resonant frequency is reduced along with the introduction of cascading inductance, so that the antenna size is miniaturized. In addition, a fifth rectangular groove (7) and a sixth rectangular groove (15) are added, which is used for reducing coupling polarization which is introduced by incomplete symmetry between the diagonal rectangular groove and the feed end and ensuring E θ And (3) with
Closer in the θ direction, a wider 3-dB beamwidth is achieved.
Two pairs of metal patch pairs are arranged around the radiation patch (2), the gaps between the two pairs of metal patch pairs and the central radiation patch are equivalent to parasitic capacitance, the through holes on the two pairs of metal patch pairs can be equivalent to parasitic inductance, an LC resonant circuit is formed, the resonant frequency of the antenna is adjusted, the resonant frequency can be reduced, and the miniaturization of the antenna structure is realized. The two pairs of metal patches are centrally symmetrical in order to reduce coupling disturbances caused by the asymmetrical structure. The gap spacing, the via holes and the aperture size can directly influence the corresponding lumped parameter values, and the working frequency of the antenna can be changed by adjusting the parameters. The distance of the opposing vias from the center of the radiating patch is uniform, but the lateral and longitudinal via distances are different in order to produce θ and
polarization of different degrees in the direction, optimizing Eθ and +.>
The index of (2) realizes better circular polarization performance.
The beneficial effects of the invention are as follows:
the invention adopts the rectangular grooves which are orderly arranged on the radiation patch, can effectively increase the path of the surface current of the patch, is equivalent to introducing inductance cascade, reduces the resonant frequency of the antenna, and does not need to enlarge the physical size of the antenna like the traditional microstrip patch antenna. In addition, two pairs of metal patches are arranged on the periphery of the radiation patch, gaps in the metal patches can be equivalently parasitic capacitance, through holes in the metal patches can be equivalently parasitic inductance to form an LC equivalent circuit, the resonant frequency of the antenna can be effectively adjusted, the frequency ratio of the two resonant frequencies of the antenna can be reduced, and a wider axial ratio beam width is obtained.
Drawings
Fig. 1 is a schematic top view of a circularly polarized microstrip antenna structure with low profile high gain wide axial ratio beam.
Fig. 2 is a schematic side view of a circularly polarized microstrip antenna structure of a low profile high gain wide axial ratio beam.
Fig. 3 is a schematic structural diagram of a circularly polarized microstrip antenna radiation patch 2 of a low-profile high-gain wide-axis ratio beam.
Fig. 4 is a diagram of the S-parameters of a circularly polarized microstrip antenna of a low profile high gain wide axial ratio beam measured by simulation software.
FIG. 5 shows the low-profile high-gain wide-axis ratio beam circular polarization microstrip antenna measured by simulation software
And->
An axial ratio beam width result graph.
FIG. 6 shows the low-profile high-gain wide-axis ratio beam circular polarization microstrip antenna measured by simulation software
And->
A pattern in the same time.
Detailed Description
The following is a description of the present invention in more detail with reference to the examples and the accompanying drawings, for the purpose of illustrating the technical aspects, the design objects and the advantages of the present invention, but the specific examples are not limited thereto.
The terms "first," "second," "third," and the like, as used herein, are used to better distinguish between various similar or symmetrical structures for ease of reading and understanding by the reader, but are not limited by these terms.
In this embodiment, as shown in fig. 1, the circular polarized microstrip antenna structure of the low-profile high-gain wide-axis ratio beam in the present invention is a schematic top view, and is characterized by comprising a dielectric substrate 1, a radiation patch 2, a system floor 3 and a rectangular slot array 4, wherein the radiation patch 2 is located at the center of the upper surface of the dielectric substrate 1, and a certain blank area is left on the upper surface of the dielectric substrate 1. The patch is also designed in a position to make the structure more symmetrical as a whole, which is advantageous for the antenna to produce a symmetrical directivity pattern. The rectangular slot columns are introduced to change the current path of the patch surface, equivalently an inductive cascade, reducing the resonant frequency of the antenna without increasing the patch size.
Fig. 2 is a schematic side view of a circular polarization microstrip antenna structure of a low-profile high-gain wide-axis ratio beam. The first patch 10, the second patch 12, the third patch 19 and the fourth patch 21 are all provided with via holes 13, and the distances between the via holes on different patches and the center of the radiation patch 2 are different. The radiating patch on the upper surface is excited by a coaxial feed through the floor and dielectric layer, said coaxial feed port 8 being perpendicular to the radiating patch 2 and the system floor 3. Based on the structure, the via hole is used for introducing parasitic inductance, and the parasitic inductance introduced by the gap forms an LC circuit, so that the resonant frequency of the antenna is better regulated, the frequency ratio of double resonant frequencies is reduced, and circular polarized waves of a wider axial ratio wave beam are obtained.
As shown in fig. 3, the slot, slit and patch are all symmetrical about the center of the patch. The radiation patch 2 is of a square structure, the center positions of four sides of the radiation patch are provided with a notch, and the positions of the four notches are respectively provided with a first patch 10, a second patch 12, a third patch 19 and a fourth patch 21; the first patch 10 and the fourth patch 21 are the same in size, and the second patch 12 and the third patch 19 are the same in size; the width of the fifth gap 14 between the left and right sides of the first patch 10, the second patch 12, the third patch 19 and the fourth patch 21 and the radiation patch 2 is equal, a first gap 9 and a fourth gap 20 with equal width are respectively reserved between the first patch 10, the fourth patch 21 and the radiation patch 2, and a second gap 11 and a third gap 18 with equal width are respectively reserved between the second patch 12, the third patch 19 and the radiation patch 2;
the radiation patch 2 is provided with a rectangular groove column 4; the rectangular groove column 4 comprises a first rectangular groove 5, a second rectangular groove 6, a third rectangular groove 16, a fourth rectangular groove 17, a fifth rectangular groove 7 and a sixth rectangular groove 15 which are sequentially arranged and are not contacted with each other; the central lines of the first rectangular groove 5, the second rectangular groove 6, the third rectangular groove 16 and the fourth rectangular groove 17 are positioned on the diagonal line of the radiation patch 2, and the second rectangular groove 6 and the third rectangular groove 16 are arranged in a central symmetry manner with respect to the center of the radiation patch 2; the fifth rectangular groove 7 and the sixth rectangular groove 15 are symmetrically arranged with respect to the straight line where the second rectangular groove 6 and the third rectangular groove 16 are positioned;
the distance between the through holes of the two metal patches opposite to the radiation patch (2) and the center of the radiation patch (2) is the same; but the vias of adjacent metal patches are not at the same distance from the center of the radiating patch.
The first rectangular groove 5 and the fourth rectangular groove 17 are identical in size, the second rectangular groove 6 and the third rectangular groove 16 are identical in size, and the fifth rectangular groove 7 and the sixth rectangular groove 15 are identical in size.
The coaxial feed port 8 is arranged between the third rectangular slot 16, the fifth rectangular slot 7 and the first slit 9.
In some more specific embodiments, the first gap 9 is located between the first patch 10 and the radiating patch 2, the second gap 11 is located between the second patch 12 and the radiating patch 2, the third gap 18 is located between the third patch 19 and the radiating patch 2, and the fourth gap 20 is located between the fourth patch 21 and the radiating patch 2. Based on the structure, two pairs of patches around the patches are relatively symmetrical, and the size of parasitic capacitance caused by the structure can be changed by adjusting the size of gaps between the patches, so that the resonant frequency of the antenna can be adjusted.
In some specific embodiments, the radiation patch 2 is symmetrical about the center, the first rectangular slot 5 and the fourth rectangular slot 17 are identical in size, the second rectangular slot 6 and the third rectangular slot 16 are identical in size, and the fifth rectangular slot 7 and the sixth rectangular slot 15 are identical in size. In some more specific embodiments, the fifth rectangular groove 7 and the sixth rectangular groove 15 are disposed on two sides of the first rectangular groove 5, the second rectangular groove 6, the third rectangular groove 16, and the fourth rectangular groove 17. Rectangular grooves on the patch are distributed in the diagonal direction of the patch, the whole structure of the rectangular groove array 4 is centrosymmetric, and the distribution of the surface current on the patch can be changed by adjusting the length and width of the grooves or the distance between the grooves on two sides and the middle groove, so that the resonant mode required by design is obtained.
In some specific embodiments, the center of the coaxial feed port 8 is substantially on the same line with the center of the vertical via hole 13, and the coaxial feed port 8 is disposed between the third rectangular slot 16, the fifth rectangular slot 7 and the first slit 9. The excitation source is positioned as far as possible on the middle line of the patch, so that circularly polarized waves can be obtained more easily.
In some specific embodiments, the centers of the four vias 13 are located on the middle lines of the long sides of the first patch 10, the second patch 12, the third patch 19, and the fourth patch 21, respectively. The position of the through hole is in the middle line of the long side of the patch, so that the structure is symmetrical, unnecessary coupling interference is reduced, and the 3-dB axial ratio beam symmetry of the antenna is optimized.
In some specific embodiments, the dielectric substrate 1 is made of a polytetrafluoroethylene glass cloth copper-clad foil plate, namely an F4B material, and the thickness is 1.575mm.
In some specific embodiments, FIG. 4 is a simulated S of a circularly polarized antenna according to the present invention 11 The parameter result diagram shows that the-10 dB impedance bandwidth covers the frequency band from 2.35GHz to 2.47GHz, the designed working frequency point is 2.41GHz in the WIFI frequency band, and the S parameters of the frequency band from 2.37GHz to 2.46GHz are smaller than-15 dB, which indicates that the antenna in the frequency band has better matching.
In some specific embodiments, FIG. 5 shows the low profile high gain wide axial ratio beam circular polarization microstrip antenna as measured by simulation software
And->
An axial ratio beam width result graph. When->
The 3dB axial ratio beam width is 230deg when +.>
When the 3dB axial ratio beam width is 242deg, it is shown that the circularly polarized antenna provided by the invention can receive circularly polarized signals with a very large angle at 2.41 GHz.
In some specific embodiments, fig. 6 is a pattern of circularly polarized microstrip antennas using a low profile high gain wide axis ratio beam of simulation software at phi=0° and phi=90°, respectively. The front-to-back ratio in the maximum radiation direction can reach 11.6dB, and the signal radiation and the reception in a longer distance can be realized.
The foregoing examples, which are described in more detail and are not to be construed as limiting the scope of the application. It should be noted that modifications and improvements to some techniques may be made by those skilled in the art without departing from the inventive principles of this patent disclosure, and any such modifications and improvements should be considered within the scope of the invention.
Claims (9)
1. A circularly polarized microstrip antenna with low profile, high gain and wide axial ratio beam is characterized by comprising
A dielectric substrate (1);
a radiation patch (2) which is positioned on the upper surface of the dielectric substrate (1);
a system floor (3) located on the lower surface of the dielectric substrate (1);
a coaxial feed port (8) which is mutually perpendicular to the radiating patch (2) and the system floor (3);
the radiation patch (2) is of a square structure, a notch is formed in the center of each of four sides of the radiation patch, and a metal patch is arranged at each notch; the metal patch is provided with a via hole, and the via hole realizes that the metal patch is connected with a system floor (3); a gap is reserved between the metal patch and the radiation patch (2);
the radiation patch (2) is provided with a rectangular groove column (4); the rectangular groove column (4) comprises a second rectangular groove (6), a third rectangular groove (16), a fifth rectangular groove (7) and a sixth rectangular groove (15) which are not contacted with each other; the center lines of the second rectangular groove (6) and the third rectangular groove (16) are positioned on the same straight line, and the second rectangular groove (6) and the third rectangular groove (16) are arranged in a central symmetry mode relative to the center of the radiation patch (2); the fifth rectangular groove (7) and the sixth rectangular groove (15) are symmetrically arranged about the straight line axis where the second rectangular groove (6) and the third rectangular groove (16) are positioned; the straight lines of the second rectangular grooves (6) and the third rectangular grooves (16) are overlapped with the diagonal line of the radiation patch (2);
the rectangular groove columns (4) on the radiation patch (2) realize cutting off the original surface current path, increasing the 'flow path' of the surface current of the radiation patch (2), and introducing cascading inductance into an antenna equivalent circuit; the rectangular groove columns (4) are arranged along the diagonal line of the radiation patch (2), and according to the dual principle of magnetic current, the surface current of the radiation patch (2) is controlled to excite a polarized degenerate mode with the phase difference of 90 degrees so as to realize circularly polarized radiation;
the rectangular slot columns (4) are equivalent to a plurality of pairs of magnetic dipoles, so that the current on the radiation patch (2) is mainly concentrated around the rectangular slot columns (4), and the resonant frequency is reduced along with the introduction of cascading inductance, so that the antenna size is miniaturized;
the fifth rectangular groove (7) and the sixth rectangular groove (15) realize the reduction of coupling polarization which is incompletely and symmetrically introduced by the second rectangular groove (6), the third rectangular groove (16) and the coaxial feed port (8) on the diagonal of the radiation patch (2), thereby ensuring E θ And E is connected with φ Closer in the θ direction, achieving a wider 3-dB beamwidth;
two pairs of metal patch pairs are arranged around the radiation patch (2), the gaps between the two pairs of metal patch pairs and the radiation patch (2) are equivalent to parasitic capacitance, and the through holes on the two pairs of metal patch pairs are equivalent to parasitic inductance, so that an LC resonant circuit is formed, the resonant frequency of the antenna is adjusted, the resonant frequency can be reduced, and the miniaturization of the antenna structure is realized.
2. The circularly polarized microstrip antenna of the low profile high gain wide axial ratio beam according to claim 1, wherein the rectangular slot array (4) further comprises a first rectangular slot (5) and a fourth rectangular slot (17) which are not contacted with each other, and the first rectangular slot (5) and the fourth rectangular slot (17) are positioned at two ends of a straight line where the second rectangular slot (6) and the third rectangular slot (16) are positioned.
3. The circularly polarized microstrip antenna of a low profile high gain wide axial ratio beam according to claim 1, characterized in that the vias of two metal patches located on both sides of the radiating patch (2) are at the same distance from the center of the radiating patch (2); but the vias of adjacent metal patches are not at the same distance from the center of the radiating patch.
4. A circularly polarised microstrip antenna of a low profile high gain wide axial ratio beam according to claim 1 characterised in that two metal patches on either side of the radiating patch (2) are equally wide as the slots of the radiating patch (2).
5. A circularly polarised microstrip antenna of a low profile high gain wide axial ratio beam according to claim 1 characterised in that the two metal patches on either side of the radiating patch (2) are of the same size.
6. A circularly polarised microstrip antenna of a low profile high gain wide axial ratio beam according to claim 2 characterised in that the first (5) and fourth (17) rectangular slots are of identical size, the second (6) and third (16) rectangular slots are of identical size and the fifth (7) and sixth (15) rectangular slots are of identical size.
7. A circularly polarised microstrip antenna of a low profile high gain wide axial ratio beam according to claim 1 characterised in that the coaxial feed port (8) is arranged between the third rectangular slot (16), the fifth rectangular slot (7) and the first slot (9).
8. The circularly polarized microstrip antenna of a low profile high gain wide axial ratio beam according to claim 2, wherein the slot widths of the second rectangular slot (6), the third rectangular slot (16), the fifth rectangular slot (7), the sixth rectangular slot (15), the first rectangular slot (5) and the fourth rectangular slot (17) are all smaller than 0.01 working wavelength.
9. The circularly polarized microstrip antenna of low profile high gain wide axial ratio beam according to claim 1, characterized in that the centers of the via holes (13) on the two metal patches on both sides of the radiating patch (2), the center of the long side of the metal patch where the current via hole (13) is located, and the center of the radiating patch (2) are all on the same straight line.
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| CN115548703B (en) * | 2022-09-28 | 2023-09-22 | 安徽大学 | Phase-controllable double-frequency circularly polarized antenna |
| CN115799834B (en) * | 2023-01-16 | 2023-05-02 | 深圳大学 | Miniaturized patch antenna based on capacitive resistor loading |
| CN117013249B (en) * | 2023-09-06 | 2024-04-05 | 南通大学 | Low elevation angle double-frequency dual-beam patch antenna |
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| CN101051707A (en) * | 2007-05-10 | 2007-10-10 | 北京航空航天大学 | Method for designing double frequency round polarized laminated micro band antenna |
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| CN202150551U (en) * | 2011-08-09 | 2012-02-22 | 华南理工大学 | Double-frequency dual-polarized antenna which can work in Beidou satellite navigation system and mobile 3G network |
| CN104319468B (en) * | 2014-10-15 | 2017-03-15 | 成都信息工程学院 | Arc microstrip antenna |
| CN109560380B (en) * | 2018-12-26 | 2024-05-14 | 国网思极神往位置服务（北京）有限公司 | Broadband high-gain antenna applied to satellite navigation terminal |
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| CN101051707A (en) * | 2007-05-10 | 2007-10-10 | 北京航空航天大学 | Method for designing double frequency round polarized laminated micro band antenna |
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