CN113497356A - Dual-band dual-polarization filtering antenna - Google Patents
Dual-band dual-polarization filtering antenna Download PDFInfo
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- CN113497356A CN113497356A CN202110787913.2A CN202110787913A CN113497356A CN 113497356 A CN113497356 A CN 113497356A CN 202110787913 A CN202110787913 A CN 202110787913A CN 113497356 A CN113497356 A CN 113497356A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
- H01Q25/04—Multimode 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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- 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
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0478—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with means for suppressing spurious modes, e.g. cross polarisation
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Abstract
The invention belongs to the field of wireless communication, in particular to a dual-band dual-polarized filter antenna in the field, which can be applied to a 5G base station and is characterized in that: the microstrip power divider comprises a first dielectric plate, a second dielectric plate, a third dielectric plate, a fourth dielectric plate, a fifth dielectric plate, a radiation patch, a first short-circuit wall, a second short-circuit wall, a third short-circuit wall, a fourth short-circuit wall, a parasitic metal ring, an E-shaped cross parasitic branch section, a U-shaped parasitic branch section, a reflecting plate and a microstrip power divider; the first dielectric plate is horizontally arranged on the uppermost layer of the whole antenna; the reflecting plate is horizontally arranged at the lowest layer of the whole antenna, and a cross gap is etched in the center of the reflecting plate; four short circuit walls which are arranged in central symmetry are arranged between the first dielectric plate and the reflecting plate; the first dielectric plate and the reflecting plate are respectively vertical to the upper and lower parts of the short circuit wall. On the basis of ensuring dual polarization, the dual-polarization broadband antenna covers two common frequency bands applied to a 5G sub6GHz base station, and the two frequency bands have good filtering response.
Description
Technical Field
The invention belongs to the field of wireless communication, and particularly relates to a dual-band dual-polarized filter antenna in the field, which can be applied to a 5G base station.
Background
In recent years, with the rapid development of wireless communication systems, antennas used for 5G sub6GHz communication are increasingly required to have performance such as miniaturization and insertion loss. Due to the cooperative integration of the radio frequency module and the antenna, the occupied space and the insertion loss of the antenna can be reduced, and the radio frequency module becomes one of the current research hotspots. On the other hand, as the communication spectrum becomes more and more crowded, the coupling between antennas operating in the near band affects the performance of the system. This puts higher demands on the selectivity of the passband edges and the out-of-band rejection capability. In combination with the above two points, the high-integration filtering antenna has been widely researched.
For the base station antenna, the dual-polarized antenna can improve multipath fading and increase channel capacity. However, most of the dual polarized filtering antennas appearing in recent years are single passband antennas. In a complex electromagnetic environment, a multiband dual-polarized antenna with high selectivity between different bands becomes more in short supply.
Disclosure of Invention
Aiming at the defects of the existing base station antenna, the invention provides a dual-band dual-polarized filter antenna suitable for the base station application so as to meet the requirement of 5G wireless communication.
The invention adopts the following scheme: a dual-band dual-polarized filtering antenna is characterized in that: the microstrip power divider comprises a first dielectric plate (1), a second dielectric plate (2), a third dielectric plate (3), a fourth dielectric plate (4), a fifth dielectric plate (5), a reflecting plate (14), a radiation patch (6), a parasitic metal ring (11), an E-shaped cross parasitic branch (12), a U-shaped parasitic branch (13), a first short-circuit wall (7), a second short-circuit wall (8), a third short-circuit wall (9), a fourth short-circuit wall (10) and a microstrip power divider (15);
the first dielectric plate (1) is horizontally arranged on the uppermost layer of the whole antenna; the reflecting plate (14) is horizontally arranged at the lowest layer of the whole antenna, and a cross gap (16) is etched in the center of the reflecting plate (14);
four short circuit walls which are arranged in a central symmetry manner are arranged between the first dielectric slab (1) and the reflecting plate (14); the first dielectric slab (1) and the reflecting slab (14) are respectively vertical to the short-circuit wall up and down;
four centrosymmetrically placed short-circuit walls include: a first short-circuit wall (7), a second short-circuit wall (8), a third short-circuit wall (9) and a fourth short-circuit wall (10);
two orthogonal surfaces of the first short-circuit wall (7) are respectively printed on the second dielectric slab (2) and the fourth dielectric slab (4);
two orthogonal surfaces of the second short-circuit wall (8) are respectively printed on the second medium plate (2) and the fifth medium plate (5);
two orthogonal surfaces of the third short-circuit wall (9) are respectively printed on the third dielectric slab (3) and the fourth dielectric slab (4);
two orthogonal surfaces of a fourth short-circuit wall (10) are respectively printed on the third dielectric slab (3) and the fifth dielectric slab (5);
two orthogonal surfaces of the four short-circuit walls are connected;
the lower ends of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10) are connected with the corresponding positions of the reflecting plate (14); a microstrip power divider (15) is printed under the reflecting plate (14), the microstrip power dividers at two ports are orthogonally arranged, a feed bridge (17) is adopted at the overlapping part, and the tail end of the microstrip power divider (15) is welded with the coaxial connector.
The parasitic metal ring (11), the E-shaped cross parasitic branch (12), the U-shaped parasitic branch (13) and 4 radiation patches (6) are arranged on the lower surface of the first dielectric slab (1), and the 4 radiation patches (6) are respectively connected with one section of the outer corners of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10); the parasitic metal ring (11) surrounds the periphery of the radiation patches (6) and is equidistant to the outer angles of the 4 radiation patches (6); the E-shaped cross parasitic branch (12) is positioned at the center of the first dielectric slab (1), and a U-shaped parasitic branch (13) is printed between two adjacent radiator patches; the radiation patch (6) is electrically connected with the reflecting plate (14) through a short-circuit wall.
The radiation patches (6) are four metal sheets with double rhombus structures, the side lengths of the two rhombus structures are respectively 8.5mm and 9mm, and the size of the overlapped part is 1.5 mm.
The lengths of two orthogonal surfaces of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10) from the orthogonal intersection point to the open end are 19 mm.
The reflecting plate (14) is a double-sided PCB, a cross-shaped gap (16) and a feed bridge (17) are etched on the upper surface of the reflecting plate (14) facing the dielectric plate, two mutually orthogonal microstrip power dividers (15) are arranged on the lower surface of the reflecting plate, and the microstrip power dividers (15) and the feed bridge (17) are electrically connected through short-circuit through holes.
The distance between the antenna radiation patch (6) and the reflecting plate (14) is 12.8mm, and the size of the reflecting plate (14) is 135mm multiplied by 135 mm.
The E-shaped cross parasitic branch (12) works in a half-wavelength resonance mode of a first passband high-frequency zero point; the U-shaped parasitic branch (13) works in a half-wavelength resonance mode of a low-frequency zero point of a second pass band, four short-circuit wall boundaries work in a quarter-wavelength resonance mode of the second pass band, and the extension line of the open end of the microstrip power divider (15) works in a quarter-wavelength resonance mode of another high-frequency zero point of the second pass band.
The upper ends of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10) are respectively welded with the edge of the radiation patch (6), at least one side of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10) is vertically connected with the first dielectric slab (1) and the reflecting slab (14), and corresponding welding conductive surfaces which vertically correspond to the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10) are arranged on the reflecting slab (14).
The size of the radiation patch (6), the height and the length of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10), the length and the width of the cross slot (16) on the floor and the length and the width of the microstrip power divider (15) are used for matching the input impedance and the bandwidth of the antenna; the size of the radiation patch (6) is adjusted to adjust the low-frequency zero of the first pass band; the length of the E-shaped cross parasitic branch (12) can be adjusted to adjust the high-frequency zero point of the first pass band; the low-frequency zero point of the second pass band can be adjusted by adjusting the length of the U-shaped parasitic branch (13); the second passband high frequency zero can be adjusted by adjusting the size of the short circuit wall; the size of the open end of the microstrip power divider (15) is adjusted to adjust the other zero point of the second passband high frequency; the position of a new resonance point can be adjusted by adjusting the size of the radiation patch (6) and the length of the short circuit wall; the size of the parasitic metal ring (11) is adjusted to enable the antenna to obtain higher in-band gain and better stop band suppression level, the sizes of the radiation patches (6), the heights and the lengths of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10), the lengths and the widths of the crossed slots (16) in the floor, the lengths and the widths of the microstrip power dividers (15), the sizes of the open ends of the microstrip power dividers (15), the sizes of the parasitic metal ring (11), the lengths of the E-shaped crossed parasitic branches and the lengths of the U-shaped parasitic branches are adjusted and optimally configured, and two frequency band ranges of the antenna can be adjusted.
The two frequency bands are respectively 2.5-3.6GHz and 4.8-5.3GHz, the reflection coefficient of a double port of the two-frequency band is less than-10 dB, the isolation degree between the ports is greater than 21dB, the gain is about 9dBi, the rejection level of a first passband low-frequency stop band of a first port of the two-frequency band is greater than 15.1dB, the first passband high-frequency stop band and a second passband low-frequency stop band are in the same frequency band, the stop band rejection level is greater than 14.8dB, and the rejection level of a second passband high-frequency stop band is greater than 16.2 dB; the first passband low-frequency stop band suppression level of the second port is larger than 15dB, the first passband high-frequency stop band and the second passband low-frequency stop band are in the same frequency band, the stop band suppression level is larger than 16.3dB, and the second passband high-frequency stop band suppression level is larger than 16.9 dB.
The invention has the beneficial effects that: according to the antenna disclosed by the invention, the radiation patch is used as an electric dipole, the short circuit wall is used as a magnetic dipole, and the inherent low-frequency zero point of the electromagnetic dipole antenna is utilized to generate the low-frequency zero point of a first pass band; the edge of the short-circuit wall generates quarter-wave resonance in the cross polarization direction, and a high-frequency zero point of a second pass band is generated; between the two zero points, half-wavelength resonance is generated by an E-shaped cross parasitic branch section positioned in the center of the radiation patch, and a first channel high-frequency zero point is formed; half-wavelength resonance is generated by the U-shaped parasitic branch between every two adjacent radiation patches, and a second passband low-frequency zero point is generated; the open end of the microstrip power divider generates quarter-wavelength resonance to generate another high-frequency zero point; the double rhombus radiation patch and the edge of the short-circuit wall generate half-wavelength resonance to form new in-band resonance; the octagonal parasitic metal ring around the radiating patch improves the high frequency stop band rejection level while reducing out-of-band gain.
According to the antenna disclosed by the invention, the radiation patches are symmetrical about the center, and the feeding modes of two polarizations are the same, so that the directional diagram is stable. And on the premise of no extra filter circuit, excellent filter response is realized.
The antenna disclosed by the invention has the advantages of high integration level, double bands, high passband edge selectivity, excellent filtering characteristic, in-band gain, stable directional diagram and the like, and is suitable for the field of wireless communication.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic perspective view of an antenna disclosed in embodiment 1 of the present invention;
fig. 2 is a top view of an antenna structure of embodiment 1 of the present invention;
fig. 3 is a structural view of an antenna short-circuit wall in embodiment 1 of the present invention;
fig. 4 is a side view of an antenna structure according to embodiment 1 of the present invention;
fig. 5 is a bottom view of an antenna structure according to embodiment 1 of the present invention;
FIG. 6 is a graph of reflectance and isolation between the first port and the second port in example 1 of the present invention;
fig. 7 is a graph of gain data for the first port and the second port in embodiment 1 of the present invention.
In the figure, 1, a first dielectric plate; 2. a second dielectric plate; 3. a third dielectric plate; 4. a fourth dielectric plate; 5. a fifth dielectric plate; 6. a radiation patch; 7. a first short-circuit wall; 8. a second short-circuit wall; 9. a third short-circuit wall; 10. a fourth short-circuit wall; 11. a parasitic metal ring; 12. e-type cross parasitic branches; 13. a U-shaped parasitic branch knot; 14. a reflective plate; 15. a microstrip power divider; 16. a cross gap; 17. and (4) bridging the feed.
Detailed Description
As shown in fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, a dual-band dual-polarized filtering antenna is characterized in that: the microstrip power divider comprises a first dielectric plate 1, a second dielectric plate 2, a third dielectric plate 3, a fourth dielectric plate 4, a fifth dielectric plate 5, a reflecting plate 14, a radiation patch 6, a parasitic metal ring 11, an E-shaped cross parasitic branch 12, a U-shaped parasitic branch 13, a first short-circuit wall 7, a second short-circuit wall 8, a third short-circuit wall 9, a fourth short-circuit wall 10 and a microstrip power divider 15;
the first dielectric plate 1 is horizontally arranged on the uppermost layer of the whole antenna; the reflecting plate 14 is horizontally arranged at the lowest layer of the whole antenna, and a cross gap 16 is etched in the center of the reflecting plate 14;
four short circuit walls which are arranged in a central symmetry manner are arranged between the first dielectric plate 1 and the reflecting plate 14; the first dielectric slab 1 and the reflecting slab 14 are respectively vertical to the short-circuit wall;
as shown in fig. 3, four centrosymmetrically-arranged short-circuit walls include: a first short-circuit wall 7, a second short-circuit wall 8, a third short-circuit wall 9 and a fourth short-circuit wall 10;
wherein, two orthogonal surfaces of the first short-circuit wall 7 are respectively printed on the second dielectric slab 2 and the fourth dielectric slab 4;
two orthogonal surfaces of the second short-circuit wall 8 are respectively printed on the second dielectric slab 2 and the fifth dielectric slab 5;
two orthogonal surfaces of the third short-circuit wall 9 are respectively printed on the third dielectric slab 3 and the fourth dielectric slab 4;
two orthogonal faces of the fourth short-circuit wall 10 are printed on the third dielectric slab 3 and the fifth dielectric slab 5, respectively;
two orthogonal surfaces of the four short-circuit walls are connected;
the lower ends of the first short-circuit wall 7, the second short-circuit wall 8, the third short-circuit wall 9 and the fourth short-circuit wall 10 are connected with the corresponding positions of the reflecting plate 14; a micro-strip power divider 15 is printed under the reflecting plate 14, the micro-strip power dividers of the two ports are orthogonally arranged, and a feed bridge 17 is adopted at the overlapping part;
the lower surface of the first dielectric plate 1 includes: the parasitic metal ring 11, the E-shaped cross parasitic branch 12, the U-shaped parasitic branch 13 and 4 radiation patches 6, wherein the 4 radiation patches 6 are respectively connected with one section of the outer corner of the first short-circuit wall 7, the second short-circuit wall 8, the third short-circuit wall 9 and the fourth short-circuit wall 10; the parasitic metal ring 11 surrounds the periphery of the radiation patches 6 and is equidistant to the outer angles of the 4 radiation patches 6; the E-shaped cross parasitic branch 12 is positioned at the center of the first dielectric slab 1, and a U-shaped parasitic branch 13 is printed between two adjacent radiator patches; the radiation patch 6 is electrically connected to the reflection plate 14 through a short-circuit wall.
The radiation patch 6 is four metal sheets with double rhombus structures, the side lengths of the two rhombus structures are respectively 8.5mm and 9mm, and the size of the overlapped part is 1.5 mm.
The first dielectric plate 1, the second dielectric plate 2, the third dielectric plate 3, the fourth dielectric plate 4 and the fifth dielectric plate 5 are F4B plates.
The first short-circuit wall 7, the second short-circuit wall 8, the third short-circuit wall 9 and the fourth short-circuit wall 10 are composed of two orthogonal surfaces, and the length of the short-circuit wall from the orthogonal intersection point to the open end is 19 mm.
The reflecting plate 14 is a double-sided PCB, a metal surface with a cross gap 16 and a feed bridge 17 is etched on the upper surface of the reflecting plate facing the dielectric plate, two mutually orthogonal microstrip power dividers 15 are arranged on the lower surface of the reflecting plate, and the microstrip power dividers 15 and the feed bridge 17 are electrically connected through short-circuit through holes. The distance from the antenna radiation patch 6 to the reflector plate 14 is 12.8mm, and the size of the reflector plate 14 is 135mm × 135 mm.
The low-frequency inherent zero point of the magnetoelectric dipole antenna is used as the low-frequency zero point of the first passband, and the E-type cross parasitic stub 12 works in a half-wavelength resonance mode of the high-frequency zero point of the first passband; the U-shaped parasitic branch 13 works in a half-wavelength resonance mode of a low-frequency zero point of the second passband, the boundary of the short-circuit wall works in a quarter-wavelength resonance mode of the second passband, and the extension line of the open end of the microstrip power divider 15 works in a quarter-wavelength resonance mode of another high-frequency zero point of the second passband.
As shown in fig. 4, the upper ends of the first short-circuit wall 7, the second short-circuit wall 8, the third short-circuit wall 9, and the fourth short-circuit wall 10 are respectively welded to the edge of the radiation patch 6, at least one edge of the first short-circuit wall 7, the second short-circuit wall 8, the third short-circuit wall 9, and the fourth short-circuit wall 10 is vertically connected to the first dielectric plate 1 and the reflection plate 14, and the reflection plate 14 has corresponding welding conductive surfaces vertically corresponding to the first short-circuit wall 7, the second short-circuit wall 8, the third short-circuit wall 9, and the fourth short-circuit wall 10.
The tail end of the microstrip power divider 15 is welded with the coaxial connector.
The size of the radiation patch 6, the height and length of the first short-circuit wall 7, the second short-circuit wall 8, the third short-circuit wall 9 and the fourth short-circuit wall 10, the length and width of the cross slot 16 on the floor, and the length and width of the microstrip power divider 15 are used for matching the input impedance and the bandwidth of the antenna; the size of the radiation patch 6 is adjusted to adjust the low-frequency zero of the first pass band; the high-frequency zero point of the first pass band can be adjusted by adjusting the length of the E-shaped cross parasitic branch 12; the low-frequency zero point of the second pass band can be adjusted by adjusting the length of the U-shaped parasitic branch 13; the second passband high frequency zero can be adjusted by adjusting the size of the short circuit wall; the size of the open end of the microstrip power divider 15 is adjusted to adjust the other zero point of the second passband high frequency; the position of a new resonance point can be adjusted by adjusting the size of the radiation patch 6 and the length of the short circuit wall; adjusting the size of the parasitic metal ring 11 can make the antenna obtain higher in-band gain and better stop-band rejection level.
In summary, the size of the radiation patch 6, the height and length of the first short-circuit wall 7, the second short-circuit wall 8, the third short-circuit wall 9, and the fourth short-circuit wall 10, the length and width of the cross slot 16 on the floor, the length and width of the microstrip power divider 15, the size of the open end of the microstrip power divider 15, the size of the parasitic metal ring 11, the length of the E-shaped cross parasitic branch, and the length of the U-shaped parasitic branch are adjusted and optimally configured, so that two frequency band ranges of the antenna operation can be adjusted, and the isolation of different polarizations can be improved, the gain can be improved, the stop band suppression level can be improved, and the far-field radiation is stable.
The two working frequency bands of the invention are 2.5-3.6GHz and 4.8-5.3GHz respectively, the reflection coefficient of the double ports is less than-10 dB, the isolation between the ports is more than 21dB, and the gain is about 9 dBi. The suppression level of a first passband low-frequency stop band of a first port is more than 15.1dB, the first passband high-frequency stop band and a second passband low-frequency stop band are in the same frequency band, the stop band suppression level is more than 14.8dB, and the second passband high-frequency stop band suppression level is more than 16.2 dB; the first passband low-frequency stop band suppression level of the second port is larger than 15dB, the first passband high-frequency stop band and the second passband low-frequency stop band are in the same frequency band, the stop band suppression level is larger than 16.3dB, and the second passband high-frequency stop band suppression level is larger than 16.9 dB.
The antenna of the invention generates polarized radiation in the direction of +/-90 degrees. The antenna can be applied to the field of wireless communication with complex frequency spectrum, wherein the wireless communication comprises but is not limited to base station communication, satellite communication and wireless local area network, and the antenna can be expanded to linear array, area array and other arrays.
The consistency and the isolation of different polarizations of the antenna are ensured by the symmetry of the antenna structure and the feed bridge of the feed structure. The microstrip power divider in the x and y directions excites one polarization radiation direction respectively.
Fig. 6 is a graph of the reflection coefficient and isolation parameters for two ports of the disclosed antenna. The two working frequency bands of the antenna are respectively 2.5-3.6GHz and 4.8-5.3GHz, the reflection coefficient of the antenna is less than-10 dB, and the isolation is greater than 21 dB.
Fig. 7 shows gain curves for two polarizations of the disclosed antenna in accordance with example 1 of the present invention. The gain of the antenna in the first pass band and the second pass band is about 9 dB. The suppression level of a first passband low-frequency stop band of a first port is more than 15.1dB, the first passband high-frequency stop band and a second passband low-frequency stop band are in the same frequency band, the stop band suppression level is more than 14.8dB, and the second passband high-frequency stop band suppression level is more than 16.2 dB; the first passband low-frequency stop band suppression level of the second port is larger than 15dB, the first passband high-frequency stop band and the second passband low-frequency stop band are in the same frequency band, the stop band suppression level is larger than 16.3dB, and the second passband high-frequency stop band suppression level is larger than 16.9 dB.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (10)
1. A dual-band dual-polarized filtering antenna is characterized in that: the microstrip power divider comprises a first dielectric plate (1), a second dielectric plate (2), a third dielectric plate (3), a fourth dielectric plate (4), a fifth dielectric plate (5), a reflecting plate (14), a radiation patch (6), a parasitic metal ring (11), an E-shaped cross parasitic branch (12), a U-shaped parasitic branch (13), a first short-circuit wall (7), a second short-circuit wall (8), a third short-circuit wall (9), a fourth short-circuit wall (10) and a microstrip power divider (15);
the first dielectric plate (1) is horizontally arranged on the uppermost layer of the whole antenna; the reflecting plate (14) is horizontally arranged at the lowest layer of the whole antenna, and a cross gap (16) is etched in the center of the reflecting plate (14);
four short circuit walls which are arranged in a central symmetry manner are arranged between the first dielectric slab (1) and the reflecting plate (14); the first dielectric slab (1) and the reflecting slab (14) are respectively vertical to the short-circuit wall up and down;
four centrosymmetrically placed short-circuit walls include: a first short-circuit wall (7), a second short-circuit wall (8), a third short-circuit wall (9) and a fourth short-circuit wall (10);
two orthogonal surfaces of the first short-circuit wall (7) are respectively printed on the second dielectric slab (2) and the fourth dielectric slab (4);
two orthogonal surfaces of the second short-circuit wall (8) are respectively printed on the second medium plate (2) and the fifth medium plate (5);
two orthogonal surfaces of the third short-circuit wall (9) are respectively printed on the third dielectric slab (3) and the fourth dielectric slab (4);
two orthogonal surfaces of a fourth short-circuit wall (10) are respectively printed on the third dielectric slab (3) and the fifth dielectric slab (5);
two orthogonal surfaces of the four short-circuit walls are connected;
the lower ends of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10) are connected with the corresponding positions of the reflecting plate (14); a microstrip power divider (15) is printed under the reflecting plate (14), the microstrip power dividers at two ports are orthogonally arranged, a feed bridge (17) is adopted at the overlapping part, and the tail end of the microstrip power divider (15) is welded with the coaxial connector.
2. A dual-band dual-polarized filtering antenna according to claim 1, wherein: the parasitic metal ring (11), the E-shaped cross parasitic branch (12), the U-shaped parasitic branch (13) and 4 radiation patches (6) are arranged on the lower surface of the first dielectric slab (1), and the 4 radiation patches (6) are respectively connected with one section of the outer corners of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10); the parasitic metal ring (11) surrounds the periphery of the radiation patches (6) and is equidistant to the outer angles of the 4 radiation patches (6); the E-shaped cross parasitic branch (12) is positioned at the center of the first dielectric slab (1), and a U-shaped parasitic branch (13) is printed between two adjacent radiator patches; the radiation patch (6) is electrically connected with the reflecting plate (14) through a short-circuit wall.
3. A dual-band dual-polarized filtering antenna according to claim 1, wherein: the radiation patches (6) are four metal sheets with double rhombus structures, the side lengths of the two rhombus structures are respectively 8.5mm and 9mm, and the size of the overlapped part is 1.5 mm.
4. A dual-band dual-polarized filtering antenna according to claim 1, wherein: the lengths of two orthogonal surfaces of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10) from the orthogonal intersection point to the open end are 19 mm.
5. A dual-band dual-polarized filtering antenna according to claim 1, wherein: the reflecting plate (14) is a double-sided PCB, a cross-shaped gap (16) and a feed bridge (17) are etched on the upper surface of the reflecting plate (14) facing the dielectric plate, two mutually orthogonal microstrip power dividers (15) are arranged on the lower surface of the reflecting plate, and the microstrip power dividers (15) and the feed bridge (17) are electrically connected through short-circuit through holes.
6. A dual-band dual-polarized filtering antenna according to claim 1, wherein: the distance between the antenna radiation patch (6) and the reflecting plate (14) is 12.8mm, and the size of the reflecting plate (14) is 135mm multiplied by 135 mm.
7. A dual-band dual-polarized filtering antenna according to claim 1, wherein: the E-shaped cross parasitic branch (12) works in a half-wavelength resonance mode of a first passband high-frequency zero point; the U-shaped parasitic branch (13) works in a half-wavelength resonance mode of a low-frequency zero point of a second pass band, four short-circuit wall boundaries work in a quarter-wavelength resonance mode of the second pass band, and the extension line of the open end of the microstrip power divider (15) works in a quarter-wavelength resonance mode of another high-frequency zero point of the second pass band.
8. A dual-band dual-polarized filtering antenna according to claim 1, wherein: the upper ends of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10) are respectively welded with the edge of the radiation patch (6), at least one side of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10) is vertically connected with the first dielectric slab (1) and the reflecting slab (14), and corresponding welding conductive surfaces which vertically correspond to the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10) are arranged on the reflecting slab (14).
9. A dual-band dual-polarized filtering antenna according to claim 1, wherein: the size of the radiation patch (6), the height and the length of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10), the length and the width of the cross slot (16) on the floor and the length and the width of the microstrip power divider (15) are used for matching the input impedance and the bandwidth of the antenna; the size of the radiation patch (6) is adjusted to adjust the low-frequency zero of the first pass band; the length of the E-shaped cross parasitic branch (12) can be adjusted to adjust the high-frequency zero point of the first pass band; the low-frequency zero point of the second pass band can be adjusted by adjusting the length of the U-shaped parasitic branch (13); the second passband high frequency zero can be adjusted by adjusting the size of the short circuit wall; the size of the open end of the microstrip power divider (15) is adjusted to adjust the other zero point of the second passband high frequency; the position of a new resonance point can be adjusted by adjusting the size of the radiation patch (6) and the length of the short circuit wall; the size of the parasitic metal ring (11) is adjusted to enable the antenna to obtain higher in-band gain and better stop band suppression level, the sizes of the radiation patches (6), the heights and the lengths of the first short-circuit wall (7), the second short-circuit wall (8), the third short-circuit wall (9) and the fourth short-circuit wall (10), the lengths and the widths of the crossed slots (16) in the floor, the lengths and the widths of the microstrip power dividers (15), the sizes of the open ends of the microstrip power dividers (15), the sizes of the parasitic metal ring (11), the lengths of the E-shaped crossed parasitic branches and the lengths of the U-shaped parasitic branches are adjusted and optimally configured, and two frequency band ranges of the antenna can be adjusted.
10. A dual-band dual-polarized filtering antenna according to claim 9, wherein: the two frequency bands are respectively 2.5-3.6GHz and 4.8-5.3GHz, the reflection coefficient of a double port of the two-frequency band is less than-10 dB, the isolation degree between the ports is greater than 21dB, the gain is about 9dBi, the rejection level of a first passband low-frequency stop band of a first port of the two-frequency band is greater than 15.1dB, the first passband high-frequency stop band and a second passband low-frequency stop band are in the same frequency band, the stop band rejection level is greater than 14.8dB, and the rejection level of a second passband high-frequency stop band is greater than 16.2 dB; the first passband low-frequency stop band suppression level of the second port is larger than 15dB, the first passband high-frequency stop band and the second passband low-frequency stop band are in the same frequency band, the stop band suppression level is larger than 16.3dB, and the second passband high-frequency stop band suppression level is larger than 16.9 dB.
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