APERTURE-SHARED DUAL-WIDEBAND ANTENNA AND ITS DESIGN METHOD

Abstract

An aperture-sharing method for a dual-band aperture-shared antenna. By means of the method, a first dielectric substrate is arranged directly above a floor, a second dielectric substrate is arranged between the floor and the first dielectric substrate; a first meta surface, a first radiation ring, a second radiation ring and a second meta surface are arranged in a first quadrant to a fourth quadrant of the top surface of the first dielectric substrate; a fourth radiation ring, a fourth meta surface, a third meta surface and a third radiation ring are arranged in a first quadrant to a fourth quadrant of the bottom surface of the first dielectric substrate; first high-frequency antenna elements are symmetrically arranged on the top surface of the second dielectric substrate; and second high-frequency antenna elements are symmetrically arranged on the bottom surface of the second dielectric substrate. Further disclosed is a dual-band aperture-shared antenna structure.

Claims

1. A aperture-sharing method for a dual-band aperture-shared antenna, comprising: providing a first dielectric substrate (3) directly above a floor (1) and providing a second dielectric substrate (2) between the floor (1) and the first dielectric substrate (3); dividing the first dielectric substrate (3) into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant, by taking the center of the first dielectric substrate as the center; providing a first meta surface (4), a first radiation ring (8), a second radiation ring (9), and a second meta surface (5) in the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant of the top surface of the first dielectric substrate (3), respectively; providing a fourth radiation ring (11), a fourth meta surface (7), a third meta surface (6), and a third radiation ring (10) in the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant of the bottom surface of the first dielectric substrate (3), respectively; providing a first feedline (12) in association with the first radiation ring (8) and the third radiation ring (10) in the middle of the bottom surface of the first dielectric substrate (3); and providing a second feedline (13) in association with the second radiation ring (9) and the fourth radiation ring (11) in the middle of the top surface of the first dielectric substrate (3); providing a first coaxial line (16) and a second coaxial line (17) for connecting a low-frequency network, wherein an inner core of the first coaxial line (16) is connected to the first feedline (12), an outer conductor of the first coaxial line (16) is connected to the first radiation ring (8), an inner core of the second coaxial line (17) is connected to the second feedline (13), and an outer conductor of the second coaxial line (17) is connected to the fourth radiation ring (11); providing two first high-frequency antenna elements (20) that are symmetrically arranged, on the top surface of the second dielectric substrate (2), providing a third feedline (14) between the two first high-frequency antenna elements (20), providing two second high-frequency antenna elements (21) that are symmetrically arranged, on the bottom surface of the second dielectric substrate (2), providing a fourth feedline (15) between the two second high-frequency antenna elements (21), and a symmetrical line between the two first high-frequency antenna elements (20) being perpendicular to a symmetrical line between the two second high-frequency antenna elements (21); and providing a third coaxial line (18) and a fourth coaxial line (19) for connecting a high-frequency network, wherein an inner core of the third coaxial line (18) is connected to the third feedline (14), an outer conductor of the third coaxial line (18) is connected to the second high-frequency antenna elements (21), an inner core of the fourth coaxial line (19) is connected to the fourth feedline (15), and an outer conductor of the fourth coaxial line (19) is connected to the first high-frequency antenna elements (20).

2. The aperture-sharing method for a dual-band aperture-shared antenna according to claim 1, wherein the first radiation ring (8), the second radiation ring (9), the third radiation ring (10), and the fourth radiation ring (11) are identical in structure and are uniformly arranged around the center of the first dielectric substrate (3) in the second quadrant, the third quadrant, the fourth quadrant, and the first quadrant, respectively; the first meta surface (4), the second meta surface (5), the third meta surface (6), and the fourth meta surface (7) are identical in structure and uniformly arranged around the center of the first dielectric substrate (3) in the first quadrant, the fourth quadrant, the third quadrant, and the second quadrant, respectively.

3. The aperture-sharing method for a dual-band aperture-shared antenna according to claim 2, wherein the first radiation ring (8) has a sector structure.

4. The aperture-sharing method for a dual-band aperture-shared antenna according to claim 2, wherein the first meta surface (4) has a square structure and comprises a plurality of first meta-surface units (22) arranged in a +45° direction, and wherein a plurality of second meta-surface units (23) arranged in a 90° direction are provided on a side, away from the first radiation ring (8), of the first meta surface (4) and on a side, away from the second meta surface (5), of the first meta surface (4).

5. The aperture-sharing method for a dual-band aperture-shared antenna according to claim 1, wherein the first high-frequency antenna elements (20) and the second high-frequency antenna elements (21) are identical in structure, and the first high-frequency antenna elements (20) comprise two arc-shaped portions (24) that are symmetrically arranged and a connecting portion (25) connecting the two arc-shaped portions (24), wherein the connecting portion (25) is in the middle of the second dielectric substrate (2) and the two arc-shaped portions (24) are located on the same circumferential track.

6. A dual-band aperture-shared antenna structure, comprising a floor (1), a high-frequency antenna radiator arranged directly above the floor (1), and a low-frequency antenna radiator arranged directly above the high-frequency antenna radiator, wherein the low-frequency antenna radiator comprises a first dielectric substrate (3), a first radiation ring (8), a second radiation ring (9), a third radiation ring (10), a fourth radiation ring (11), a first meta surface (4), a second meta surface (5), a third meta surface (6), a fourth meta surface (7), a first coaxial line (16), and a second coaxial line (17), wherein the first dielectric substrate (3) is divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant by taking the center of the first dielectric substrate as the center; the first radiation ring (8), the second radiation ring (9), the third radiation ring (10), and the fourth radiation ring (11) are identical in structure and uniformly arranged around the center of the first dielectric substrate (3) in the second quadrant, the third quadrant, the fourth quadrant, and the first quadrant, respectively; the first meta surface (4), the second meta surface (5), the third meta surface (6), and the fourth meta surface (7) are identical in structure and uniformly arranged around the center of the first dielectric substrate (3) in the first quadrant, the fourth quadrant, the third quadrant, and the second quadrant, respectively; the first radiation ring (8), the second radiation ring (9), the first meta surface (4), and the second meta surface (5) are located on the top surface of the first dielectric substrate (3); the third radiation ring (10), the fourth radiation ring (11), the third meta surface (6), and the fourth meta surface (7) are located on the bottom surface of the first dielectric substrate (3); a first feedline (12) in association with the first radiation ring (8) and the third radiation ring (10) is provided in the middle of the bottom surface of the first dielectric substrate (3); a second feedline (13) in association with the second radiation ring (9) and the fourth radiation ring (11) is provided in the middle of the top surface of the first dielectric substrate (3); an inner core of the first coaxial line (16) is connected to the first feedline (12), an outer conductor of the first coaxial line (16) is connected to the first radiation ring (8), an inner core of the second coaxial line (17) is connected to the second feedline (13), and an outer conductor of the second coaxial line (17) is connected to the fourth radiation ring (11); and lower ends of the first coaxial line (16) and the second coaxial line (17) pass downward through the high-frequency antenna radiator and the floor (1).

7. The dual-band aperture-shared antenna structure according to claim 6, wherein the first radiation ring (8) has a sector structure.

8. The dual-band aperture-shared antenna structure according to claim 6, wherein the first meta surface (4) has a square structure and comprises a plurality of first meta-surface units (22) arranged in a +45° direction, and wherein a plurality of second meta-surface units (23) arranged in a 90° direction are provided on a side, away from the first radiation ring (8), of the first meta surface (4) and on a side, away from the second meta surface (5) of the first meta surface (4), respectively.

9. The dual-band aperture-shared antenna structure according to claim 6, wherein the high-frequency antenna radiator comprises a second dielectric substrate (2), two first high-frequency antenna elements (20) symmetrically arranged on the top surface of the second dielectric substrate (2), a third coaxial line (18) in association with the first high-frequency antenna elements (20), two second high-frequency antenna elements (21) symmetrically arranged on the bottom surface of the second dielectric substrate (2), and a fourth coaxial line (19) in association with the second high-frequency antenna elements (21), wherein the first high-frequency antenna elements (20) and the second high-frequency antenna elements (21) are identical in structure, and the first high-frequency antenna elements (20) comprise two arc-shaped portions (24) that are symmetrically arranged and a connecting portion (25) connecting the two arc-shaped portions (24), wherein the connecting portion (25) is in the middle of the second dielectric substrate (2) and the two arc-shaped portions (24) are located on the same circumferential track; a third feedline (14) is provided between the two first high-frequency antenna elements (20), wherein an inner core of the third coaxial line (18) is connected to the third feedline (14) and an outer conductor of the third coaxial line (18) is connected to the second high-frequency antenna elements (21); a fourth feedline (15) is provided between the two second high-frequency antenna elements (21), wherein an inner core of the fourth coaxial line (19) is connected to the fourth feedline (15) and an outer conductor of the fourth coaxial line (19) is connected to the first high-frequency antenna elements (20); lower ends of the third coaxial line (18) and the fourth coaxial line (19) pass downward through the floor (1); and a symmetrical line between the two first high-frequency antenna elements (20) is perpendicular to a symmetrical line between the two second high-frequency antenna elements (21).

10. The dual-band aperture-shared antenna structure according to claim 9, wherein the first dielectric substrate (3), the second dielectric substrate (2), and the floor (1) each has a square structure, an area of the first dielectric substrate (3) is greater than that of the second dielectric substrate (2), and an angle between an edge of the first dielectric substrate (3) and an edge of the second dielectric substrate (2) is 45°.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG. 1 is a schematic diagram of a stereoscopic structure of the present disclosure;

[0028] FIG. 2 is a schematic diagram of a bottom structure of the present disclosure;

[0029] FIG. 3 is a schematic top diagram of a first dielectric substrate according to the present disclosure;

[0030] FIG. 4 is a schematic front diagram of the present disclosure;

[0031] FIG. 5 is a schematic diagram of the structure of a top surface of a second dielectric substrate according to the present disclosure;

[0032] FIG. 6 is a schematic diagram of the structure of a bottom surface of a second dielectric substrate according to the present disclosure;

[0033] FIG. 7 is a diagram of an impedance bandwidth of a low-frequency antenna radiator according to the present disclosure;

[0034] FIG. 8 is a gain diagram of a low-frequency antenna radiator according to the present disclosure;

[0035] FIG. 9 is a diagram of an impedance bandwidth of a high-frequency antenna radiator according to the present disclosure; and

[0036] FIG. 10 is a gain diagram of a high-frequency antenna radiator according to the present disclosure.

[0037] Where: 1—floor, 2—second dielectric substrate, 3—first dielectric substrate, 4—first meta surface, 5—second meta surface, 6—third meta surface, 7—fourth meta surface, 8—first radiation ring, 9—second radiation ring, 10—third radiation ring, 11—fourth radiation ring, 12—first feedline, 13—second feedline, 14—third feedline, 15—fourth feedline, 16—first coaxial line, 17—second coaxial line, 18—third coaxial line, 19—fourth coaxial line, 20—first high-frequency antenna element, 21—second high-frequency antenna element, 22—first meta-surface unit, 23—second meta-surface unit, 24—arc-shaped portion, 25—connecting portion, and 26—metalized via.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The present disclosure will now be further described with reference to specific embodiments in the accompanying drawings.

[0039] With reference to FIGS. 1 to 10, an aperture-sharing method for a dual-band aperture-shared antenna is as follows.

[0040] A first dielectric substrate 3 is provided directly above a floor 1, and a second dielectric substrate 2 is provided between the floor 1 and the first dielectric substrate 3.

[0041] The first dielectric substrate 3 is divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant by taking the center of the first dielectric substrate as the center. A first meta surface 4, a first radiation ring 8, a second radiation ring 9, and a second meta surface 5 are provided in the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant of the top surface of the first dielectric substrate 3, respectively; a fourth radiation ring 11, a fourth meta surface 7, a third meta surface 6, and a third radiation ring 10 are provided in the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant of the bottom surface of the first dielectric substrate 3, respectively. A first feedline 12 corresponding to the first radiation ring 8 and the third radiation ring 10 is provided in the middle of the bottom surface of the first dielectric substrate 3, and a second feedline 13 corresponding to the second radiation ring 9 and the fourth radiation ring 11 is provided in the middle of the top surface of the first dielectric substrate 3.

[0042] A first coaxial line 16 and a second coaxial line 17 for connecting a low-frequency network are provided, where an inner core of the first coaxial line 16 is connected to the first feedline 12, an outer conductor of the first coaxial line 16 is connected to the first radiation ring 8, an inner core of the second coaxial line 17 is connected to the second feedline 13, an outer conductor of the second coaxial line 17 is connected to the fourth radiation ring 11, the first feedline 12 is electrically connected to the third radiation ring 10, and the second feedline 13 is electrically connected to the second radiation ring 9.

[0043] Two symmetrically arranged first high-frequency antenna elements 20 are provided on the top surface of the second dielectric substrate 2, and a third feedline 14 is provided between the two first high-frequency antenna elements 20. Two symmetrically arranged second high-frequency antenna elements 21 are provided on the bottom surface of the second dielectric substrate 2, and a fourth feedline 15 is provided between the two second high-frequency antenna elements 21. A symmetrical line between the two first high-frequency antenna elements 20 is perpendicular to a symmetrical line between the two second high-frequency antenna elements 21.

[0044] A third coaxial line 18 and a fourth coaxial line 19 for connecting a high-frequency network are provided, where an inner core of the third coaxial line 18 is connected to the third feedline 14, an outer conductor of the third coaxial line 18 is connected to the second high-frequency antenna elements 21, an inner core of the fourth coaxial line 19 is connected to the fourth feedline 15, and an outer conductor of the fourth coaxial line 19 is connected to the first high-frequency antenna elements 20.

[0045] A dual-band aperture-shared antenna structure includes a floor 1, a high-frequency antenna radiator arranged directly above the floor 1, and a low-frequency antenna radiator arranged directly above the high-frequency antenna radiator. The low-frequency antenna radiator includes a first dielectric substrate 3, a first radiation ring 8, a second radiation ring 9, a third radiation ring 10, a fourth radiation ring 11, a first meta surface 4, a second meta surface 5, a third meta surface 6, a fourth meta surface 7, a first coaxial line 16, and a second coaxial line 17. The first dielectric substrate 3 is divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant by taking the center of the first dielectric substrate as the center. The first radiation ring 8, the second radiation ring 9, the third radiation ring 10, and the fourth radiation ring 11 have a same structure and are uniformly arranged around the center of the first dielectric substrate 3 in the second quadrant, the third quadrant, the fourth quadrant, and the first quadrant, respectively. The first radiation ring 8, the second radiation ring 9, the third radiation ring 10, and the fourth radiation ring 11 have annular array structures. The first meta surface 4, the second meta surface 5, the third meta surface 6, and the fourth meta surface 7 have the same structure and are arranged uniformly around the center of the first dielectric substrate 3 in the first quadrant, the fourth quadrant, the third quadrant, and the second quadrant, respectively. The first meta surface 4, the second meta surface 5, the third meta surface 6, and the fourth meta surface 7 have annular array structures. The first radiation ring 8, the second radiation ring 9, the first meta surface 4, and the second meta surface 5 are located on the top surface of the first dielectric substrate 3; the third radiation ring 10, the fourth radiation ring 11, the third meta surface 6, and the fourth meta surface 7 are located on the bottom surface of the first dielectric substrate 3. A first feedline 12 corresponding to the first radiation ring 8 and the third radiation ring 10 is provided in the middle of the bottom surface of the first dielectric substrate 3; a second feedline 13 corresponding to the second radiation ring 9 and the fourth radiation ring 11 is provided in the middle of the top surface of the first dielectric substrate 3. An inner core of the first coaxial line 16 is connected to the first feedline 12, an outer conductor of the first coaxial line 16 is connected to the first radiation ring 8. An inner core of the second coaxial line 17 is connected to the second feedline 13, and an outer conductor of the second coaxial line 17 is connected to the fourth radiation ring 11. Lower ends of the first coaxial line 16 and the second coaxial line 17 pass downward through the high-frequency antenna radiator and the floor 1. The first feedline 12 is electrically connected to the third radiation ring 10 and the second feedline 13 is electrically connected to the second radiation ring 9.

[0046] In this embodiment, the first radiation ring 8 has a sector structure. The first meta surface 4 has a square structure and includes a plurality of first meta-surface units 22 arranged in a +45° direction, and a plurality of second meta-surface units 23 arranged in a 90° direction are provided on a side, away from the first radiation ring 8, of the first meta surface 4 and on a side, away from the second meta surface 5, of the first meta surface 4, respectively. The first meta-surface units 22 and the second meta-surface units 23 both take the first quadrant as reference.

[0047] The high-frequency antenna radiator includes a second dielectric substrate 2, two first high-frequency antenna elements 20 symmetrically arranged on the top surface of the second dielectric substrate 2, a fourth coaxial line 19 corresponding to the first high-frequency antenna elements 20, two second high-frequency antenna elements 21 symmetrically arranged on the bottom surface of the second dielectric substrate 2, and a third coaxial line 18 corresponding to the second high-frequency antenna elements 21. The first high-frequency antenna elements 20 and the second high-frequency antenna elements 21 have the same structure. The first high-frequency antenna elements 20 include two symmetrically arranged arc-shaped portions 24 and a connecting portion 25 connecting the two arc-shaped portions 24, where the connecting portion 25 is in the middle of the second dielectric substrate 2 and the two arc-shaped portions 24 are located on the same circumferential track. A third feedline 14 is provided between the two first high-frequency antenna elements 20, where an inner core of the third coaxial line 18 is connected to the third feedline 14 and an outer conductor of the third coaxial line 18 is connected to the second high-frequency antenna elements 21. A fourth feedline 15 is provided between the two second high-frequency antenna elements 21, where an inner core of the fourth coaxial line 19 is connected to the fourth feedline 15 and an outer conductor of the fourth coaxial line 19 is connected to the first high-frequency antenna elements 20. Lower ends of the third coaxial line 18 and the fourth coaxial line 19 pass downward through the floor 1. A symmetrical line between the two first high-frequency antenna elements 20 is perpendicular to a symmetrical line between the two second high-frequency antenna elements 21. In particular, by taking the quadrants of the first dielectric substrate 3 as reference, the two arc-shaped portions 24 of the first high-frequency antenna elements 20 are symmetrical in the +45° direction, and the two arc-shaped portions 24 of the second high-frequency antenna elements 21 are symmetrical in the −45° direction.

[0048] The third feedline 14 is provided with a metalized via 26 corresponding to the third coaxial line 18, and the fourth feedline 15 is provided with a metalized via 26 corresponding to the fourth coaxial line 19.

[0049] The first dielectric substrate 3, the second dielectric substrate 2, and the floor 1 are all square structures. An area of the first dielectric substrate 3 is greater than that of the second dielectric substrate 2 and an angle between an edge of the first dielectric substrate 3 and an edge of the second dielectric substrate 2 is 45°.

[0050] The first feedline 12 and the second feedline 13 which are orthogonally arranged to each other, as well as the third feedline 14 and the fourth feedline 15 which are orthogonally arranged to each other, are configured to excite a +45° polarization and a −45° polarization of antennas, and the antennas are fed with coaxial lines.

[0051] In this embodiment, the dielectric substrate 3 and the second dielectric substrate 2 all adopt a high-frequency Rogers 4350B substrate with a thickness of 0.76 mm and a relative dielectric constant of 3.48. The antenna radiators have a planar structure, which can realize dual-polarized bandwidths of 690 MHz-960 MHz and 1.7 GHz-2.7 GHz, and the return loss is greater than 10 dB.

[0052] FIG. 7 is a diagram of an impedance bandwidth of a low-frequency antenna radiator according to the present embodiment. It can be seen from FIG. 7 that the low-frequency antenna radiator of the present disclosure has an impedance bandwidth of 690 MHz to 960 MHz, a return loss of 10 dB, and an isolation of more than 30 dB over the bandwidth.

[0053] FIG. 8 is a gain diagram of a low-frequency antenna radiator according to the present embodiment. It can be seen from FIG. 8 that an in-band gain of the low-frequency antenna radiator of the present disclosure is substantially more than 8 dBi.

[0054] FIG. 9 is a diagram of an impedance bandwidth of a high-frequency antenna radiator according to the present embodiment. It can be seen from FIG. 9 that the high-frequency antenna radiator of the present disclosure has an impedance bandwidth of 1.7 GHz to 2.7 GHz, a return loss of 10 dB, and an isolation of more than 30 dB over the bandwidth.

[0055] FIG. 10 is a gain diagram of a high-frequency antenna radiator according to the present embodiment. It can be seen from FIG. 10 that an in-band gain of the high-frequency antenna radiator of the present disclosure is substantially more than 8 dBi.

[0056] The low-frequency antenna of the present disclosure covers a frequency range from 690 MHz to 960 MHz and each high-frequency antenna element covers a frequency range from 1.7 GHz to 2.7 GHz, which is suitable to be applied for 2G/3G/LTE (4G) systems. By introducing a meta surface on the low-frequency antenna, the radiation performance of the high-frequency antenna element, which was deteriorated due to the mutual coupling between the low-frequency antenna and the high-frequency antenna array, particularly the shielding effect caused by the low-frequency antenna on the high-frequency elements, is obviously improved. At the same time, the radiation performance of the low-frequency antenna will not be affected. In this way, a good dual-band aperture-sharing effect as well as two wide frequency bandwidths can be achieved. The antenna structure according to the present disclosure is simple. By directly embedding a meta surface into a low-frequency antenna radiator, a high integration can be achieved, and the complexity of the structure is reduced. The antenna of the present disclosure has a compact structure, which enables dual-band aperture-sharing of the low-frequency antenna and high-frequency antenna array within a smaller antenna size or aperture.

[0057] While the foregoing is directed to the preferred embodiments of the present disclosure, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the disclosure, which will not affect the effects of embodiments of the present disclosure and the utility of the patent.