CN110649383B - Broadband dual-circularly-polarized antenna based on dielectric resonator loading - Google Patents
Broadband dual-circularly-polarized antenna based on dielectric resonator loading Download PDFInfo
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- CN110649383B CN110649383B CN201911003453.9A CN201911003453A CN110649383B CN 110649383 B CN110649383 B CN 110649383B CN 201911003453 A CN201911003453 A CN 201911003453A CN 110649383 B CN110649383 B CN 110649383B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- 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
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
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Abstract
The invention discloses a broadband dual circularly polarized antenna based on dielectric resonator loading, which is characterized by at least comprising: the dielectric substrate and the dielectric resonator are mutually parallel and are arranged in an up-down laminated manner; a metal floor is arranged on the upper surface of the dielectric substrate, and the size of the metal floor is consistent with that of the dielectric substrate; the lower surface of the dielectric substrate is provided with a feed microstrip line, and the feed microstrip line is positioned on a middle symmetrical line of the dielectric substrate; and a metalized via hole is arranged on the middle symmetrical line of the dielectric substrate and is connected with the feed microstrip line. The antenna simultaneously excites the radiation modes of the dielectric resonator and the L-shaped groove by utilizing the double-feed characteristics of the L-shaped groove and the probe, realizes the double circular polarization performance on a wider frequency band, and can be applied to a wireless communication system.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a broadband dual-circularly polarized antenna based on dielectric resonator loading.
Background
With the demands of light weight, high radiation efficiency and low cost, dielectric antennas have been widely studied in wireless communication systems. Circularly polarized dielectric resonators are of interest due to their low polarization mismatch and low multipath interference. Meanwhile, the dual circular polarized antenna can simultaneously receive and transmit left-handed or right-handed circular polarized waves, and due to the rapid development of wireless communication systems, the requirement for an antenna having a dual circular polarized operating frequency band is increasing.
The prior art discloses a single-feed circularly polarized dielectric resonator antenna, which includes: the lower surface of the dielectric substrate is provided with a microstrip line, the upper surface of the dielectric substrate is provided with a metal large ground layer, and the metal large ground layer is provided with a coupling groove which is used for being matched with the microstrip line to carry out coupling feed; the top layer radiation unit comprises a strip dielectric resonator and a hollow double-layer dielectric resonator; the double-layer dielectric resonator is arranged on the metal ground layer and covers the coupling groove; the strip dielectric resonator is arranged on the metal ground layer and is positioned in a hollow area in the double-layer dielectric resonator, wherein the strip dielectric resonator is formed by rotating a preset angle around a central point of the strip dielectric resonator along the counterclockwise direction of a top-down viewing angle in a horizontal plane from the direction perpendicular to the microstrip line so as to realize the conversion from linearly polarized waves to circularly polarized waves.
The prior art discloses a double-frequency circularly polarized rectangular dielectric resonator, and belongs to the technical field of electronics. The antenna comprises a rectangular dielectric substrate, a microstrip line arranged on the back of the dielectric substrate, a metal ground plate which is arranged on the front of the dielectric substrate and etched with an improved circular gap, and a rectangular dielectric block arranged at the central position of the upper layer of the ground plate. The antenna main mode can generate circularly polarized radiation in a low frequency band; the high-order mode can generate circularly polarized radiation in a high frequency band, and the dual-frequency circularly polarized performance of the DRA can be realized through the combination of the high-order mode and the circularly polarized radiation.
Disclosure of Invention
The invention provides a broadband dual-circularly polarized antenna based on dielectric resonator loading. The antenna utilizes the microstrip line to carry out double feeding on the L-shaped groove and the probe, simultaneously excites the radiation modes of the dielectric resonator and the L-shaped groove, and realizes double circular polarization performance on a wider frequency band.
In order to achieve the purpose, the technical scheme of the invention is as follows: a broadband dual-circularly polarized antenna based on dielectric resonator loading is characterized in that: at least comprises the following steps: the dielectric substrate and the dielectric resonator are mutually parallel and are arranged in an up-down laminated manner;
a metal floor is arranged on the upper surface of the dielectric substrate, and the size of the metal floor is consistent with that of the dielectric substrate;
the lower surface of the dielectric substrate is provided with a feed microstrip line, and the feed microstrip line is positioned on a middle symmetrical line of the dielectric substrate;
a metalized through hole is formed in the middle symmetrical line of the dielectric substrate and connected with the feed microstrip line;
the metal floor is provided with an L-shaped groove and a circular groove, the circular groove is concentric with the metalized via hole, the radius of the circular groove is larger than that of the metalized via hole, and the circular groove surrounds the metalized via hole; the L-shaped groove comprises a long right-angle edge and a short right-angle edge;
the feed microstrip line is arranged below the L-shaped groove, and the L-shaped groove isolates the feed microstrip line from the metal floor;
the dielectric resonator is positioned in the middle of the dielectric substrate and covers part of the feed microstrip line and the L-shaped groove;
the metal probe is positioned on one side of the dielectric resonator, is positioned above the metalized through hole and is connected with the metalized through hole;
the feed microstrip line extends to the end of the medium substrate, the end is connected with the inner core of the SMA connector, and the metal floor is connected with the SMA connector outer skin.
The dielectric resonator is formed by overlapping and connecting two right-angled triangles with the same size through right angles, the hypotenuses of the two right-angled triangles with the same size are divided in parallel, and the short right-angle side and the long right-angle side of the two right-angled triangles with the same size form a left-right and up-down distribution structure on the square dielectric substrate 1.
One short right-angle side of the two right-angle triangles with the same size passes through the circle center of the metalized via hole, and the other long right-angle side of the two right-angle triangles passes through the long right-angle side covering part of the L-shaped groove.
The two right-angle triangles with the same size are 33mm multiplied by 50 mm.
The two right-angle triangles with the same size are overlapped and connected through right angles to form a right-angle triangle with the short and long sizes of 63.5mm multiplied by 96mm and the height of 19 mm.
The relative dielectric constant of the dielectric resonator is 9.8.
The two sides of the L-shaped groove are respectively 12mm and 32mm in length, and the width is 4 mm.
The areas of the dielectric substrate and the metal floor are both 150 × 150mm2The thickness of the dielectric substrate is 1mm, and the relative dielectric constant is 2.65.
The width of the metal probe is 0.5mm, and the height of the metal probe is 19 mm.
The length of the feed microstrip line is 93mm, and the width of the feed microstrip line is 2.8 mm.
The invention has the following advantages:
the antenna utilizes a mixed mode of the dielectric resonator and the gap, better realizes the characteristic of double circular polarization, and has the advantages of simple structure, easy processing, small volume, light weight, low cost and the like.
Drawings
Fig. 1 is a top view of an antenna top layer provided in embodiment 1 of the present invention.
Fig. 2 is a left side view of an antenna according to an embodiment of the present invention.
Fig. 3 is a top view of an antenna substrate according to an embodiment of the invention.
Fig. 4 is an S parameter diagram of an antenna according to an embodiment of the present invention.
Fig. 5 is an axial ratio diagram of an antenna provided in an embodiment of the present invention.
Fig. 6 is a gain diagram of an antenna according to an embodiment of the present invention.
Fig. 7 is a directional diagram of the antenna provided by the embodiment of the invention at 2.11 GHz.
Fig. 8 is a directional diagram of the antenna provided by the embodiment of the present invention at 2.39 GHz.
Fig. 9 is a directional diagram of the antenna provided in the embodiment of the present invention at 3.05 GHz.
Fig. 10 is a directional diagram of the antenna provided by the embodiment of the invention at 3.30 GHz.
In the figure: 1. a dielectric substrate; 2. a dielectric resonator; 3. a feed microstrip line; 4. a metal floor; 5. metallizing the via hole; 6. an L-shaped slot; 7. a circular groove; 8. a metal probe; 9. and (4) SMA joints.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Examples
As shown in fig. 1, as shown in fig. 1 and fig. 2, a broadband dual circularly polarized antenna based on dielectric resonator loading at least includes: a dielectric substrate 1 and a dielectric resonator 2 which are parallel to each other and stacked up and down;
the upper surface of the dielectric substrate 1 is provided with a metal floor 4, and the size of the metal floor 4 is consistent with that of the dielectric substrate 1;
the lower surface of the dielectric substrate 1 is provided with a feed microstrip line 3, and the feed microstrip line 3 is positioned on a middle symmetrical line of the dielectric substrate 1;
a metalized via hole 5 is formed in the middle symmetrical line of the dielectric substrate 1, and the metalized via hole 5 is connected with the feed microstrip line 3;
the metal floor 4 is provided with an L-shaped groove 6 and a circular groove 7, the circular groove 7 is concentric with the metalized via hole 5, the radius of the circular groove 7 is larger than that of the metalized via hole 5, and the circular groove 7 surrounds the metalized via hole 5; the L-shaped groove 6 comprises a long right-angle edge and a short right-angle edge;
the feed microstrip line 3 is arranged below the L-shaped groove 6, and the L-shaped groove 6 isolates the feed microstrip line from the metal floor 4;
the dielectric resonator 2 is positioned in the middle of the dielectric substrate 1, and the dielectric resonator 2 covers part of the feed microstrip line 3 and the L-shaped groove 6;
the metal probe 8 is positioned on one side of the dielectric resonator 2, and the metal probe 8 is positioned above and connected with the metalized through hole 5;
the feed microstrip line 3 extends to the end of the dielectric substrate 1, the end is connected with the inner core of the SMA connector 9, and the metal floor 4 is connected with the outer skin of the SMA connector 6.
In fig. 1, the dielectric resonator 2 is formed by two right-angled triangles with the same size being overlapped and connected through a right angle, the hypotenuses of the two right-angled triangles with the same size are divided in parallel, and the short right-angle side and the long right-angle side of the two right-angled triangles with the same size form a left-right and up-down distribution structure on the square dielectric substrate 1.
One short right-angle side of the two right-angle triangles with the same size passes through the circle center of the metalized via hole 5, and the other long right-angle side of the two right-angle triangles passes through the long right-angle side covering part of the L-shaped groove 6.
The two right-angle triangles with the same size are 33mm multiplied by 50 mm.
The two right-angle triangles with the same size are overlapped and connected through right angles to form a right-angle triangle with the short and long sizes of 63.5mm multiplied by 96mm and the height of 19 mm.
The dielectric resonator 2 has a relative dielectric constant of 9.8.
The length of two sides of the L-shaped groove 6 is respectively 12mm and 32mm, and the width is 4 mm.
As shown in FIG. 2, the area of the dielectric substrate 1 and the metal floor 4 are both 150 × 150mm2The thickness of the dielectric substrate is 1mm, and the relative dielectric constant is 2.65.
The metal probe 8 is 0.5mm wide and 19mm high.
In fig. 3, the feed microstrip line 3 has a length of 93mm and a width of 2.8 mm.
The selection of the specific size is only selected in the embodiment of the present invention, and for those skilled in the art, the size of each part can be appropriately adjusted according to actual needs.
When the SMA connector 9 feeds the feed microstrip line 3, the feed microstrip line 3 feeds the L-shaped slot 6 and the metal probe 8 at the same time, the dielectric resonator is excited by the L-shaped slot 6 and the metal probe 8 at the same time to generate a basic mode and a higher-order mode of the dielectric resonator, and meanwhile, the L-shaped slot 6 also generates a radiation field and a slot radiation mode while generating an excitation field. In the low frequency band, the dielectric resonator mode is the dominant mode, and in the high frequency band gap mode is the dominant mode, so that the antenna generates broadband double circular polarization characteristics.
The invention can adjust the middle two resonance frequency points in the frequency band by adjusting the length and the width of the dielectric resonator 2 and adjust the lowest resonance frequency point and the highest resonance frequency point by the size of the L-shaped groove 6.
The present invention can optimize the axial ratio by adjusting the length and width of the dielectric resonator 2, the L-shaped groove 5, and the position of the L-shaped groove 5.
The simulation and test results of the return loss curve of the embodiment are shown in fig. 4, and the test results show that the impedance bandwidth of-10-dB of the antenna at the low frequency band is 63.7% (1.78-3.38 GHz), which indicates that the antenna realizes broadband operation.
The simulation and test results of the return loss curve of the embodiment are shown in fig. 4, and the test results show that the impedance bandwidth of-10-dB of the antenna at the low frequency band is 63.7% (1.78-3.38 GHz), which indicates that the antenna realizes broadband operation.
The results of the simulation and the test of the circular polarization axial ratio curve of the embodiment are shown in fig. 5, and the test results show that the low frequency band of the embodiment realizes the left-hand circular polarization, the-3 dB axial ratio bandwidth is 22.7% (1.99-2.50 GHz), and the high frequency band realizes the right-hand circular polarization, and the-3 dB axial ratio bandwidth is 15.7% (2.93-3.43 GHz), which shows that the antenna realizes the circular polarization on the two frequency bands.
The results of the circular polarization gain simulation and the test of the embodiment are shown in fig. 6, and the test results show that the gain at the 2.25 GHz central frequency of the low band is 5.86 dBi, which is left-hand circular polarization, and the gain at the 3.18GHz central frequency of the high band is 2.29 dBi, which is right-hand circular polarization, which indicates that the antenna realizes dual circular polarization.
Fig. 7, 8, 9 and 10 show the radiation patterns of the antenna at frequencies of 2.11 GHz, 2.39GHz, 3.05 GHz and 3.30GHz, respectively. Therefore, the antenna has a stable directional diagram in the working frequency band, which shows that the broadband circularly polarized directional antenna applied to the wireless communication system has good radiation characteristics.
Compared with the prior art, the invention has the advantages of simple structure, easy processing, low cost, and better impedance bandwidth, axial ratio bandwidth and gain bandwidth. The far-zone radiation pattern is stable in the public bandwidth, so that the method is suitable for a dual-frequency dual-circular-polarization wireless communication system.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A broadband dual-circularly polarized antenna based on dielectric resonator loading is characterized in that: at least comprises the following steps: a dielectric substrate (1) and a dielectric resonator (2) which are parallel to each other and are stacked up and down;
the upper surface of the dielectric substrate (1) is provided with a metal floor (4), and the size of the metal floor (4) is consistent with that of the dielectric substrate (1);
the lower surface of the dielectric substrate (1) is provided with a feed microstrip line (3), and the feed microstrip line (3) is positioned on a middle symmetrical line of the dielectric substrate (1);
a metalized through hole (5) is formed in the middle symmetrical line of the dielectric substrate (1), and the metalized through hole (5) is connected with the feed microstrip line (3);
the metal floor (4) is provided with an L-shaped groove (6) and a circular groove (7), the circular groove (7) is concentric with the metalized via hole (5), the radius of the circular groove is larger than that of the metalized via hole (5), and the circular groove (7) surrounds the metalized via hole (5); the L-shaped groove (6) comprises a long right-angle edge and a short right-angle edge;
the feed microstrip line (3) is arranged below the L-shaped groove (6), and the L-shaped groove (6) isolates the feed microstrip line from the metal floor (4);
the dielectric resonator (2) is positioned in the middle of the dielectric substrate (1), and the dielectric resonator (2) covers part of the feed microstrip line (3) and the L-shaped groove (6);
the metal probe (8) is positioned on one side of the dielectric resonator (2), and the metal probe (8) is positioned above and connected with the metalized through hole (5);
the feed microstrip line (3) extends to the end of the dielectric substrate (1), the end is connected with the inner core of the SMA connector (9), and the metal floor (4) is connected with the outer skin of the SMA connector (9);
the dielectric resonator (2) is formed by overlapping and connecting two right-angled triangles with the same size through right angles, the hypotenuses of the two right-angled triangles with the same size are divided in parallel, and the short right-angle side and the long right-angle side of the two right-angled triangles with the same size form a left-right and up-down distribution structure on the square dielectric substrate (1);
one short right-angle side of the two right-angle triangles with the same size passes through the circle center of the metalized through hole (5), and the other long right-angle side of the two right-angle triangles passes through the long right-angle side covering part of the L-shaped groove (6).
2. The dielectric resonator loading based broadband dual circularly polarized antenna as claimed in claim 1, wherein the two right triangles with the same size are 33mm x 50 mm.
3. The broadband dual circularly polarized antenna based on dielectric resonator loading as claimed in claim 1, wherein the two right triangles with same size are connected by right angle superposition to form a right triangle with a length and a length of 63.5mm x 96mm and a height of 19 mm.
4. The broadband dual circularly polarized antenna based on the dielectric resonator loading as claimed in claim 1, wherein the dielectric resonator (2) has a relative dielectric constant of 9.8.
5. The broadband dual circularly polarized antenna based on dielectric resonator loading as claimed in claim 1, wherein the length of each side of the L-shaped slot (6) is 12mm and 32mm, and the width is 4 mm.
6. The broadband dual circularly polarized antenna based on dielectric resonator loading as claimed in claim 1, wherein the areas of the dielectric substrate (1) and the metal floor (4) are both 150 × 150mm and 150mm2Dielectric substrateThe thickness is 1mm, and the relative dielectric constant is 2.65.
7. The broadband dual circularly polarized antenna based on dielectric resonator loading as claimed in claim 1, wherein the metal probe (8) is 0.5mm wide and 19mm high.
8. The dielectric resonator loading based broadband dual circularly polarized antenna according to claim 1, wherein the feed microstrip line (3) has a length of 93mm and a width of 2.8 mm.
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| CN111082226B (en) * | 2020-01-07 | 2021-11-23 | 电子科技大学 | Subminiature circularly polarized antenna based on electromagnetic super-resonator |
| TW202137633A (en) | 2020-01-31 | 2021-10-01 | 美商羅傑斯公司 | Polarized electromagnetic device |
| CN112713391B (en) * | 2020-12-23 | 2022-02-22 | 西安交通大学 | High-order dual-frequency dual-circularly-polarized dielectric resonant antenna based on D-CRLH feed network |
| CN112736427B (en) * | 2020-12-23 | 2022-05-20 | 西安交通大学 | Dual-band dual-circular-polarization mixed dielectric resonator antenna for vehicle-mounted internal device |
| CN113097727A (en) * | 2021-03-05 | 2021-07-09 | 深圳市信维通信股份有限公司 | Dual-frequency dielectric resonant antenna for 5G communication and mobile equipment |
| CN113571883A (en) * | 2021-07-12 | 2021-10-29 | 深圳市信维通信股份有限公司 | Ultra-wideband dielectric resonator antenna and electronic equipment |
| CN113659348B (en) * | 2021-07-20 | 2023-07-18 | 曲阜师范大学 | Super-surface-loaded circularly polarized dielectric resonator antenna |
| CN114824763A (en) * | 2022-05-27 | 2022-07-29 | 湖南大学 | Microstrip line fed ionic liquid antenna |
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