CN115882220A - Broadband high-isolation magnetoelectric dipole antenna for full-duplex application and communication equipment - Google Patents
Broadband high-isolation magnetoelectric dipole antenna for full-duplex application and communication equipment Download PDFInfo
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Abstract
The invention discloses a broadband high-isolation magnetoelectric dipole antenna applied in full duplex and communication equipment. The invention utilizes the modes of vertical and horizontal polarization, increase of the distance between the feeder lines, differential feed technology and the like, so that the current coupling between two dual-polarized ports is extremely small, and the invention has the advantages of wide frequency band and high isolation.
Description
Technical Field
The invention relates to a magnetoelectric dipole antenna, in particular to a broadband high-isolation magnetoelectric dipole antenna for full-duplex application and communication equipment, and belongs to the technical field of wireless communication.
Background
In a mobile communication system, an antenna is a converter of a communication device circuit signal and a space radiation electromagnetic wave, and thus a base station antenna is an important component of the mobile communication system. Its characteristics directly affect the overall performance of the entire wireless network. With the rapid development of wireless communication systems, mobile communication networks put higher demands on the performance of base station antennas. Broadband, high isolation base station antennas are urgently needed to be designed and developed. The magnetoelectric dipole antenna has the advantages of high impedance matching bandwidth, stable gain flatness, low cross polarization and the like, and is particularly suitable for a wireless mobile communication system. Therefore, the magnetoelectric dipole antenna with simple structure and excellent performance has wide application prospect.
Most of the existing magnetoelectric dipole antennas adopt classical L-shaped probe feeding to excite the antennas. The same feed structure is rotated by 90 degrees to realize dual polarization, and the isolation of the antenna is low and is generally not higher than 30dB. Therefore, the isolation of the magnetoelectric dipole antenna is improved to be a problem to be overcome at present, and the broadband magnetoelectric dipole antenna with high isolation is one of the preferred functional components of the wireless mobile communication system.
The invention patent application with the Chinese patent publication number of CN112117534A utilizes a fork-shaped feed structure to form vertical and horizontal polarization, and utilizes different polarization modes to improve the isolation between feed ports by coupling feed through an H-shaped aperture on a metal floor; the invention patent application with the Chinese patent publication No. CN114914692A forms dual polarization by using different radiation modes, and improves the isolation between ports. The invention in the field at present is mostly to realize very wide bandwidth with low isolation, and high isolation is one of the development trends of the wireless communication system at present, so that a high-isolation magnetoelectric dipole antenna with stable radiation characteristic is necessarily one of the preferred functional components of a full-duplex wireless communication system.
At present, four symmetrical metal patches are mostly adopted in the field as radiators, a classical T-shaped feeder line is used for exciting an antenna, dual polarization is realized through a symmetrical feed structure, but the current coupling effect between the feeder lines is large, and the isolation degree is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a broadband high-isolation magnetoelectric dipole antenna for full-duplex application, which has the advantages of broadband and high isolation.
Another object of the present invention is to provide a communication device comprising the above-mentioned wideband high isolation magnetoelectric dipole antenna.
The purpose of the invention can be achieved by adopting the following technical scheme:
a broadband high-isolation magnetoelectric dipole antenna applied in full duplex comprises a radiation patch, an II-type feeder line, a reverse type feeder line, a metal floor, a dielectric plate and a feed network, wherein the metal floor is arranged on the upper surface of the dielectric plate, the radiation patch is connected with the metal floor to form a magnetoelectric dipole, the II-type feeder line and the reverse type feeder line are arranged on the dielectric plate and are orthogonal to each other, and the feed network is arranged on the lower surface of the dielectric plate and is respectively connected with the II-type feeder line and the reverse type feeder line.
Further, the n-type feeder comprises a first metal short-circuit pin, a second metal short-circuit pin, two metal branch groups and a fifth metal branch, the two metal branch groups form a vertical part of the n-type feeder, and the fifth metal branch forms a horizontal part of the n-type feeder; every metal branch knot group includes first metal branch knot, second metal branch knot, third metal branch knot and fourth metal branch knot, and first metal branch knot one end of two metal branch knot groups links to each other with the feed network through first metal short-circuit needle, second metal short-circuit needle respectively, the other end of first metal branch knot links to each other with the one end of second metal branch knot, the other end of second metal branch knot links to each other with the one end of third metal branch knot, the other end of third metal branch knot links to each other with the one end of fourth metal branch knot, and the fourth metal branch knot other end of two metal branch knot groups links to each other with the both ends of fifth metal branch knot respectively.
Furthermore, the r-type feeder line comprises a third metal short-circuit pin, a sixth metal branch, a seventh metal branch, an eighth metal branch, a ninth metal branch and a tenth metal branch, the sixth metal branch and the seventh metal branch form a vertical part of the r-type feeder line, and the eighth metal branch, the ninth metal branch and the tenth metal branch form a horizontal part of the r-type feeder line; one end of the sixth metal branch is connected with the feed network through a third metal short-circuit pin, the other end of the sixth metal branch is connected with one end of a seventh metal branch, the other end of the seventh metal branch is connected with one end of an eighth metal branch, the other end of the eighth metal branch is connected with one end of a ninth metal branch, and the other end of the ninth metal branch is connected with one end of a tenth metal branch.
Further, the feed network comprises a first feed port, a second feed port, a first metal pad, a first metalized via hole, a second metal pad, a second metalized via hole and a power division phase shifter, the first feed port is connected with the power division phase shifter, the first metal pad is arranged at the first feed port and is connected with the metal floor through the first metalized via hole, the second feed port is connected with the reverse L-shaped feed line, the second metal pad is arranged at the second feed port and is connected with the metal floor through the second metalized via hole, and the power division phase shifter is connected with the II-shaped feed line.
Further, the power division phase shifter comprises a Wilkinson power divider and a broadband phase shifter which are connected.
Furthermore, the radiation patch is connected with the metal floor through a metal plate.
Furthermore, the radiation patch comprises four metal branches, each metal branch is connected with the metal floor through a group of metal arms, a metal fillet is cut at the position, far away from the top point of the corresponding metal arm, of each metal branch, and each group of metal arms comprises two vertical metal plates.
Furthermore, the metal floor further comprises a reflecting plate which is arranged around the metal floor in a square structure.
Furthermore, the reflecting plate comprises four rectangular metal plates, and the four rectangular metal plates are arranged around the metal floor in a surrounding manner to form a square structure.
The other purpose of the invention can be achieved by adopting the following technical scheme:
a communication device comprises the broadband high-isolation magnetoelectric dipole antenna.
Compared with the prior art, the invention has the following beneficial effects:
1. the Pi-shaped feeder line and the Gamma-shaped feeder line of the antenna are mutually orthogonal, vertical and horizontal dual-polarized radiation can be realized, the space between the Pi-shaped feeder line and the Gamma-shaped feeder line is increased by utilizing vertical and horizontal dual polarization, and a differential feed network is introduced, so that the isolation is further improved, the current coupling between two dual-polarized ports is extremely small, and the isolation degree is more than 64dB.
2. The antenna of the invention introduces the broadband power division phase shifter, improves the dual-polarized impedance bandwidth, the working frequency band is 1.7 GHz-2.7 GHz, the working frequency band is wider, the relative impedance bandwidth is 45.4%, the antenna has good radiation characteristic, the directional diagram is stable, the front-to-back ratio is greater than 15dB, the cross polarization is less than-25 dB, and the dual-polarized gain is higher than 7.5dBi.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a wideband high-isolation magnetoelectric dipole antenna according to an embodiment of the present invention.
Fig. 2 is a structural diagram of a pi-shaped feeder of the wideband high-isolation magnetoelectric dipole antenna according to the embodiment of the present invention.
Fig. 3 is a structural diagram of a Γ -type feed line of a wideband high isolation magnetoelectric dipole antenna according to an embodiment of the present invention.
Fig. 4 is a bottom surface structure view of a dielectric plate of the wideband high-isolation magnetoelectric dipole antenna according to the embodiment of the present invention.
Fig. 5 is a structure diagram of a radiation patch of a wideband high-isolation magnetoelectric dipole antenna according to an embodiment of the present invention.
Fig. 6 is a top view of a wideband high isolation magnetoelectric dipole antenna according to an embodiment of the present invention.
Fig. 7 is a dimension diagram of a Π -shaped power feeding line of a wideband high isolation magnetoelectric dipole antenna according to an embodiment of the present invention.
Fig. 8 is a diagram of the dimensions of a Γ -type feed line of a wideband high isolation magnetoelectric dipole antenna in accordance with an embodiment of the present invention.
Fig. 9 is a side view of a wideband high isolation magnetoelectric dipole antenna according to an embodiment of the present invention.
Fig. 10 is a graph of S-parameter of a wideband high-isolation magnetoelectric dipole antenna according to an embodiment of the present invention.
Fig. 11 is a gain curve diagram of a wideband high isolation magnetoelectric dipole antenna according to an embodiment of the present invention.
Fig. 12 and 13 are horizontal plane radiation patterns of the first feed port and the second feed port of the broadband high-isolation magnetoelectric dipole antenna at the center frequency of 2.2GHz, respectively, according to an embodiment of the present invention.
Fig. 14 and fig. 15 are vertical plane radiation patterns of the first feed port and the second feed port of the wideband high-isolation magnetoelectric dipole antenna at the center frequency of 2.2GHz, respectively, according to an embodiment of the present invention.
Wherein, 100-radiating patch, 101-eleventh metal branch, 102-twelfth metal branch, 103-thirteenth metal branch, 104-fourteenth metal branch, 200-metal arm, 201-first group of metal arms, 202-second group of metal arms, 203-third group of metal arms, 204-fourth group of metal arms, 300-pi type feeder, 301-first metal shorting pin, 302-second metal shorting pin, 303-first metal branch, 304-second metal branch, 305-third metal branch, 306-fourth metal branch, 307-fifth metal branch, 400-r type feeder, 401-third metal shorting pin, 402-sixth metal branch, 403-seventh metal branch, 404-eighth metal branch, 405-ninth metal branch, 406-tenth metal branch, 500-reflector plate, 600-metal pad, 700-dielectric plate, 800-dielectric plate, 801-first feeding network, 802-second feeding port, 803-ninth metal branch, 807-tenth metal branch, 500-reflector plate, 600-metal pad, 700-dielectric plate, 800-dielectric plate, 801-first feeding network, 802-second feeding port, 803-second feeding port, 806-second metal phase shifter, 808-broadband metal phase shifter, and broadband power divider.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
The embodiment is as follows:
as shown in fig. 1, the present embodiment provides a wideband high-isolation magnetoelectric dipole antenna for full-duplex application, which can be applied to various communication devices, and includes a radiation patch 100, a pi-type power feed line 300, a r-type power feed line 400, a metal floor 600, a dielectric plate 700, and a power feed network 800, wherein the metal floor 600 is disposed on the upper surface of the dielectric plate 700 by printing, the radiation patch 100 is connected to the metal floor 600 to form a magnetoelectric dipole, the pi-type power feed line 300 and the r-type power feed line 400 are disposed on the dielectric plate 700, the pi-type power feed line 300 and the r-type power feed line 400 are orthogonal to each other, and the power feed network 800 is disposed on the lower surface of the dielectric plate 700 by printing and is connected to the pi-type power feed line 300 and the r-type power feed line 400, respectively; the metal floor 600 has a thickness of 0.05mm, the dielectric sheet 700 is an Arlon 25FR dielectric sheet, the dielectric constant is 3.58, and the loss tangent is 0.0035.
As shown in fig. 1 and fig. 2, the ii-type feeder 300 includes a first metal shorting pin 301, a second metal shorting pin 302, two metal branch groups, and a fifth metal branch 307, where the two metal branch groups form a vertical portion of the ii-type feeder, and the fifth metal branch 307 forms a horizontal portion of the ii-type feeder; each metal branch group comprises a first metal branch 303, a second metal branch 304, a third metal branch 305 and a fourth metal branch 306, one end of the first metal branch 303 of each of the two metal branch groups is connected with the feed network 800 through a first metal short-circuit pin 301 and a second metal short-circuit pin 302 respectively, so that the n-type feed line 300 excites the antenna, the other end of the first metal branch 303 is connected with one end of the second metal branch 304, the other end of the second metal branch 304 is connected with one end of the third metal branch 305, the other end of the third metal branch 305 is connected with one end of the fourth metal branch 306, and the other ends of the fourth metal branches 306 of the two metal branch groups are connected with two ends of the fifth metal branch 307 respectively.
As shown in fig. 1 to fig. 3, the r-type power feed line 400 includes a third metal short-circuit pin 401, a sixth metal branch 402, a seventh metal branch 403, an eighth metal branch 404, a ninth metal branch 405, and a tenth metal branch 406, the sixth metal branch 402 and the seventh metal branch 403 form a vertical portion of the r-type power feed line, and the eighth metal branch 404, the ninth metal branch 405, and the tenth metal branch 406 form a horizontal portion of the r-type power feed line; one end of the sixth metal branch 402 is connected to the feed network 800 through the third metal short-circuit pin 401, so that the r-type feed line 400 excites the antenna, vertical and horizontal dual-polarization radiation can be realized because the r-type feed line 400 and the n-type feed line 300 are orthogonal to each other, the other end of the sixth metal branch 402 is connected to one end of the seventh metal branch 403, the other end of the seventh metal branch 403 is connected to one end of the eighth metal branch 404, the other end of the eighth metal branch 404 is connected to one end of the ninth metal branch 405, and the other end of the ninth metal branch 405 is connected to one end of the tenth metal branch 406.
As shown in fig. 1 to 4, the feeding network 800 includes a first feeding port 801, a second feeding port 802, a first metal pad 803, a first metalized via 804, a second metal pad 805, a second metalized via 806 and a power division phase shifter 807, the first feeding port 801 is connected to the power division phase shifter 807, the first metal pad 803 is disposed at the first feeding port 801 and is connected to the metal floor 600 through the first metalized via 804, the second feeding port 802 is connected to the r-type feeding line 400, specifically, the second feeding port 802 is connected to the r-type feeding line 400 through a third metal shorting pin 401, the second metal pad 805 is disposed at the second feeding port 802 and is connected to the metal floor 600 through the second metalized via 806, the power division phase shifter 807 is connected to the h-type feeding line 300, specifically, the power division phase shifter 807 is connected to the h-type feeding line 300 through the first metal shorting pin 301 and the second metal shorting pin 302; the first feeding port 801 and the second feeding port 802 are both 50 Ω feeding ports, the power division phase shifter 807 is a 180 ° power division phase shifter, and includes a wilkinson power divider 808 and a broadband phase shifter 809 connected thereto, and correspondingly, the broadband phase shifter 809 is a 180 ° broadband phase shifter.
As shown in fig. 1 and 5, the radiation patch 100 is connected to a metal floor 600 through a metal plate to form a magnetoelectric dipole, and specifically, the radiation patch 100 includes four metal branches, where the four metal branches are an eleventh metal branch 101, a twelfth metal branch 102, a thirteenth metal branch 103, and a fourteenth metal branch 104, respectively, each metal branch is connected to the metal floor 600 through one set of metal arms 200, that is, four sets of metal arms 200 are provided, the four sets of metal arms are a first set of metal arm 201, a second set of metal arm 202, a third set of metal arm 203, and a fourth set of metal arm 204, respectively, a metal fillet is cut at a vertex of each metal branch far away from the corresponding metal arm 200, and each set of metal arm 200 includes two vertical metal plates.
Further, the broadband high-isolation magnetoelectric dipole antenna of the embodiment further includes a reflection plate 500, the reflection plate 500 is disposed around the metal floor 600 in a square structure, and the low-frequency gain of the antenna can be improved by introducing the reflection plate 500; specifically, the reflection plate 500 includes four rectangular metal plates, each of which has a thickness of 1mm, and the four rectangular metal plates are disposed around the metal floor 600 in a square structure.
As shown in fig. 6, the antenna metal floor 600 is square, the length G is 146mm, a metal fillet with a radius R of 13.6mm is cut at the vertex of the radiation patch 100 away from the metal arm 200, and a side length L is cut at two adjacent vertices m At an angle of 8.1mm, length L of the metal arm s And 21.6mm. Distance D between the radiations 1 6.7mm; as shown in FIG. 7, the first metal branch length L of the Pi-shaped feeder 300 1 Is 3mm, width W 1 Is 3.1mm, the length L of the second metal branch 2 Is 7.6mm, and has a width W 2 2.3mm, the length L of the third metal branch 3 Is 6.4mm, and has a width W 3 5.7mm, the length L of the fourth metal branch 4 Is 14.9mm, width W 2 5.4mm, length L of the fifth metal branch 5 Is 21mm, width W 2 Is 5.4mm; as shown in FIG. 8, a first metal stub length L of a T-type feed line 400 1 Is 3mm, width W 1 4.2mm, length L of the second metal branch 2 Is 17mm, width W 2 4.8mm, the length L of the third metal branch 3 Is 18.4mm, width W 3 4.8mm, the length L of the fourth metal branch 4 Is 17.1mm, and has a width W 2 5.5mm, length L of the fifth metal branch 5 Is 25.3mm, and has a width W 2 Is 3.5mm; as shown in fig. 9, the thickness H of the dielectric plate 1 0.762mm, both pi-type and r- type feed lines 300 and 400 are of thickness H 3 、H 4 Is made of 1mm metal plate, and has a height H 2 Is 34mm, and the height H of the square reflecting plate 5 And 23.5mm.
As shown in fig. 10, fig. 11, and fig. 12 to fig. 15, which are S-parameter curve diagrams, gain curve diagrams, and radiation pattern diagrams of the broadband high-isolation magnetoelectric dipole antenna of the present embodiment, it can be seen that the working frequency band of the antenna is 1.7 GHz-2.7 GHz, the relative bandwidth is 45.5%, the antenna has good radiation characteristics, the pattern diagram is stable, the front-to-back ratio is greater than 15dB, the cross polarization is less than-25 dB, and the isolation | S is 21 And | is larger than 64dB, and the gain of the dual polarization is respectively higher than 7.5dBi.
In summary, the pi-type feeder line and the r-type feeder line of the antenna of the present invention are orthogonal to each other, so that vertical and horizontal dual-polarized radiation can be achieved, and by using vertical and horizontal dual polarization, increasing the distance between the pi-type feeder line and the r-type feeder line and introducing a differential feed network, isolation is further improved, so that current coupling between two dual-polarized ports is extremely small, and isolation is greater than 64dB; in addition, the antenna introduces a broadband power division phase shifter, the dual-polarized impedance bandwidth is improved, the working frequency band is 1.7 GHz-2.7 GHz, the working frequency band is wider, the relative impedance bandwidth is 45.4%, the antenna has good radiation characteristics, a directional diagram is stable, the front-to-back ratio is greater than 15dB, the cross polarization is less than-25 dB, and the dual-polarized gain is higher than 7.5dBi.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes, modifications, substitutions, combinations and omissions may be made in the form and detail of the embodiments without departing from the spirit and scope of the invention.
Claims (10)
1. The broadband high-isolation magnetoelectric dipole antenna is characterized by comprising a radiation patch, an n-shaped feeder line, a r-shaped feeder line, a metal floor, a dielectric plate and a feed network, wherein the metal floor is arranged on the upper surface of the dielectric plate, the radiation patch is connected with the metal floor to form a magnetoelectric dipole, the n-shaped feeder line and the r-shaped feeder line are arranged on the dielectric plate and are orthogonal to each other, and the feed network is arranged on the lower surface of the dielectric plate and is respectively connected with the n-shaped feeder line and the r-shaped feeder line.
2. The wideband high-isolation magnetoelectric dipole antenna according to claim 1, wherein said Π -type feed line comprises a first metal shorting pin, a second metal shorting pin, two metal branch groups and a fifth metal branch, the two metal branch groups forming a vertical portion of the Π -type feed line, the fifth metal branch forming a horizontal portion of the Π -type feed line; every metal branch knot group includes first metal branch knot, second metal branch knot, third metal branch knot and fourth metal branch knot, and first metal branch knot one end of two metal branch knot groups links to each other with the feed network through first metal short-circuit needle, second metal short-circuit needle respectively, the other end of first metal branch knot links to each other with the one end of second metal branch knot, the other end of second metal branch knot links to each other with the one end of third metal branch knot, the other end of third metal branch knot links to each other with the one end of fourth metal branch knot, and the fourth metal branch knot other end of two metal branch knot groups links to each other with the both ends of fifth metal branch knot respectively.
3. The broadband high-isolation magnetoelectric dipole antenna according to claim 1, wherein the r-type feed line includes a third metal shorting pin, a sixth metal stub, a seventh metal stub, an eighth metal stub, a ninth metal stub and a tenth metal stub, the sixth metal stub and the seventh metal stub constitute a vertical portion of the r-type feed line, and the eighth metal stub, the ninth metal stub and the tenth metal stub constitute a horizontal portion of the r-type feed line; one end of the sixth metal branch is connected with the feed network through a third metal short-circuit pin, the other end of the sixth metal branch is connected with one end of a seventh metal branch, the other end of the seventh metal branch is connected with one end of an eighth metal branch, the other end of the eighth metal branch is connected with one end of a ninth metal branch, and the other end of the ninth metal branch is connected with one end of a tenth metal branch.
4. The broadband high-isolation magnetoelectric dipole antenna according to claim 1, wherein the feed network comprises a first feed port, a second feed port, a first metal pad, a first metalized via, a second metal pad, a second metalized via, and a power division phase shifter, wherein the first feed port is connected to the power division phase shifter, the first metal pad is disposed at the first feed port and connected to a metal floor through the first metalized via, the second feed port is connected to a r-type feed line, the second metal pad is disposed at the second feed port and connected to the metal floor through the second metalized via, and the power division phase shifter is connected to the n-type feed line.
5. The wideband high isolation magnetoelectric dipole antenna according to claim 4, wherein the power division phase shifter comprises a Wilkinson power divider and a wideband phase shifter connected.
6. The broadband high-isolation magnetoelectric dipole antenna according to claim 1, wherein the radiating patch is connected to a metal floor via a metal plate.
7. The broadband high-isolation magnetoelectric dipole antenna according to claim 6, wherein the radiating patch comprises four metal branches, each metal branch is connected with a metal floor through a group of metal arms, a metal fillet is cut at the vertex of each metal branch far away from the corresponding metal arm, and each group of metal arms comprises two vertical metal plates.
8. The broadband high-isolation magnetoelectric dipole antenna according to any one of claims 1 to 7, further comprising a reflection plate, wherein the reflection plate is arranged around the metal floor in a square structure.
9. The broadband high-isolation magnetoelectric dipole antenna according to claim 8, wherein the reflecting plate comprises four rectangular metal plates, and the four rectangular metal plates are arranged around the metal floor in a square structure.
10. A communication device, characterized by comprising a broadband high isolation magnetoelectric dipole antenna according to any one of claims 1 to 9.
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| CN202310069956.6A CN115882220B (en) | 2023-02-07 | 2023-02-07 | Broadband high-isolation magneto-electric dipole antenna for full duplex application and communication equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116598798A (en) * | 2023-06-16 | 2023-08-15 | 西安交通大学 | K-band wide-angle scanning phased array antenna unit and antenna array |
| CN116598798B (en) * | 2023-06-16 | 2024-02-20 | 西安交通大学 | K-band wide-angle scanning phased array antenna unit and antenna array |
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| CN115882220B (en) | 2023-06-06 |
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