CN115954649B

CN115954649B - Multi-resonance-point broadband + -45 DEG dual-polarized antenna

Info

Publication number: CN115954649B
Application number: CN202310225474.5A
Authority: CN
Inventors: 董元旦; 刘梦雅; 汤周睿; 李亚轩
Original assignee: Microgrid Union Technology Chengdu Co ltd
Current assignee: Microgrid Union Technology Chengdu Co ltd
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-05-16
Anticipated expiration: 2043-03-10
Also published as: CN115954649A

Abstract

The invention relates to a broadband + -45 DEG dual-polarized antenna with multiple resonance points, which belongs to the technical field of communication and comprises a radiation substrate, wherein parasitic patches are arranged on the lower surface of the radiation substrate, a main radiation patch is arranged on the upper surface of the radiation substrate, a first slot penetrating through the radiation substrate is arranged in the middle of the main radiation patch, one end of a feed structure is connected with the main radiation patch through the first slot, the other end of the feed structure penetrates through a second slot arranged on a metal floor to fix the metal floor, and electromagnetic energy is coupled among the main radiation patches, between the main radiation patches and the parasitic patches and among the parasitic patches, so that the antenna generates 3 resonance points in an operating frequency band. According to the invention, the parasitic patch is added, so that the antenna generates three resonance points in an operating frequency band, S11 in the frequency band between the resonance points is smaller than-14 dB, and the bandwidth is 1.72-3.45GHz; the whole structure is simple, the geometric parameters are less, and the optimization tuning is convenient.

Description

Multi-resonance-point broadband + -45 DEG dual-polarized antenna

Technical Field

The invention relates to the technical field of communication, in particular to a multi-resonance-point broadband + -45 DEG dual-polarized antenna.

Background

With the rapid development of mobile communication technology, data configured by mobile communication equipment are increasingly increased, and users have raised higher requirements on data transmission rate and delay of mobile communication, and dual-polarized antennas are important components of outdoor base stations.

The existing common dual-polarized base station antenna usually adopts an annular radiation structure to realize broadband operation, and a parasitic structure is added on the basis of the annular radiation structure to realize expansion of the working bandwidth, but the existing technical scheme for expanding the bandwidth by using the parasitic structure of other layers has the defects that a metal sheet and a radiation substrate are not in the same plane, and an additional supporting structure is required, so that the whole structure is relatively complex, and the bandwidth expansion degree is limited.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a multi-resonance-point broadband + -45 DEG dual-polarized antenna, and solves the defects of the existing dual-polarized base station antenna.

The aim of the invention is achieved by the following technical scheme: a multi-resonance-point broadband + -45 DEG dual-polarized antenna comprises a radiation substrate, wherein parasitic patches are arranged on the lower surface of the radiation substrate, a main radiation patch is arranged on the upper surface of the radiation substrate, a first slot penetrating through the radiation substrate is formed in the middle of the main radiation patch, one end of a feed structure is connected with the main radiation patch through the first slot, the other end of the feed structure penetrates through a second slot formed in a metal floor to fix the metal floor, electromagnetic energy is coupled among the main radiation patches, between the main radiation patches and the parasitic patches and between the parasitic patches, and the antenna generates 3 resonance points in an operating frequency band.

The main radiation patch comprises four patch strips, the four patch strips are positioned on the diagonal of the radiation substrate, the main radiation patch with a cross structure is formed between the four patch strips, a cross-shaped gap I is formed between the four patch strips, a first slot penetrating through the radiation substrate is formed in each patch strip, and the four patch strips are coupled to generate a resonance point.

The parasitic patch comprises eight triangular patches, two triangular patches are arranged on the lower surface of the radiation substrate in the upper, lower, left and right directions, and the two triangular patches in each direction are arranged at the included angle position between two patch strips; gaps are reserved between two triangular patches in each direction, a cross-shaped gap II is formed by the gaps between the two triangular patches in the four directions, the cross-shaped gap II and the cross-shaped gap I are in an up-down corresponding relationship, the triangular patches increase the coupling between patch strips, and in-band impedance matching is improved. The triangular patch serves as a high frequency radiating element, creating a new resonance point.

The feeding structure comprises two orthogonal first feeding balun and a second feeding balun, one ends of the first feeding balun and the second feeding balun are connected with the patch strip through a first slot, and the other ends of the first feeding balun and the second feeding balun penetrate through a second slot formed in the metal floor to be fixed on the metal floor.

The invention has the following advantages: a multi-resonance-point broadband + -45 DEG dual-polarized antenna is characterized in that parasitic patches are added to enable the antenna to generate three resonance points in an operating frequency band, S11 in frequency bands among the resonance points is smaller than-14 dB, and the bandwidth is 1.72-3.45GHz; the whole structure is simple, the geometric parameters are less, and the optimization tuning is convenient.

Drawings

FIG. 1 is a schematic three-dimensional structure of the present invention;

FIG. 2 is a schematic diagram of an explosive structure according to the present invention;

FIG. 3 is a top view of a radiating substrate;

FIG. 4 is a schematic view of the lower surface of a radiating substrate;

FIG. 5 is a schematic view of a metal floor;

fig. 6 is a schematic diagram of S parameters of a broadband dual polarized antenna;

FIG. 7 is a graph showing the S-parameter contrast of the presence or absence of parasitic structures on a radiating substrate;

FIG. 8 is a graph of peak gain versus frequency for an antenna;

fig. 9 antenna radiation pattern;

in the figure: 1-main radiation patch, 2-parasitic patch, 3-radiation substrate, 31-first slot, 4-feed structure, 41-first feed balun, 42-second feed balun, 5-metal floor, 51-second slot, 6-patch strip, 7-cross slot I, 8-triangle patch, 9-cross slot II.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Accordingly, the following detailed description of the embodiments of the present application, provided in connection with the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application. The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 and fig. 2, the invention specifically relates to a multi-resonance-point broadband ± 45 ° dual-polarized antenna, which works at 1.72GHz-3.45GHz, and comprises a radiation substrate 3, parasitic patches 2 are arranged on the lower surface of the radiation substrate 3, a main radiation patch 1 is arranged on the upper surface of the radiation substrate 3, a first slot 31 penetrating through the radiation substrate 3 is arranged in the middle of the main radiation patch 1, one end of a feed structure 4 is connected with the main radiation patch 1 through the first slot 31, the other end of the feed structure passes through a second slot 51 arranged on a metal floor 5 to fix the metal floor 5, electromagnetic energy is coupled among the main radiation patches 1, between the main radiation patches 1 and the parasitic patches 2, and between the parasitic patches 2, so that the antenna generates 3 resonance points in an operating frequency band, and the operating bandwidth is expanded.

As shown in fig. 3 and fig. 4, the main radiation patch 1 includes four patch strips 6, the four patch strips 6 are located on diagonal lines of the radiation substrate 3, a cross-shaped main radiation patch 1 is formed between each other, a cross-shaped gap 7 is formed between the four patch strips 6, a first slot 31 penetrating through the radiation substrate 3 is formed on each patch strip 6, and the four patch strips 6 are coupled to each other to generate a resonance point.

Further, the parasitic patch 2 includes eight triangular patches 8, two triangular patches 8 are disposed in four directions of up, down, left and right on the lower surface of the radiation substrate 3, and the two triangular patches 8 in each direction are disposed at an included angle position between the two patch strips 6; gaps are reserved between two triangular patches 8 in each direction, a cross-shaped gap II 9 is formed by the gaps between the two triangular patches 8 in the four directions, the cross-shaped gap II 9 and the cross-shaped gap I7 are in up-down correspondence, and the triangular patches 8 are coupled to generate a resonance point.

Further, as shown in fig. 5, the feeding structure 4 includes two orthogonal first feeding balun 41 and second feeding balun 42, one end of the first feeding balun 41 and one end of the second feeding balun 42 are connected with the patch strip 6 through the first slot 31, and the other end passes through the second slot 51 formed in the metal floor 5 to fix the metal floor 5; the electromagnetic energy is further coupled to the eight triangular patches 8 after being transmitted to the main radiating patch 1 via two balun, and the main radiating patch 1 and the parasitic patch 2 radiate electromagnetic energy together.

The main radiation patch 1 and the parasitic patch 2 have simple structures and fewer geometric parameters, are convenient for optimizing tuning, and the two orthogonal first feed balun 41 and the second feed balun 42 penetrate through the first slot 31 to excite two polarization modes of the antenna respectively, and ensure higher polarization isolation (more than 22 dB).

As shown in fig. 7, the S11 parameter comparison of an antenna without parasitic patch 2 is shown with the antenna proposed by the present invention. It can be seen that when the parasitic patch 2 is not present, the antenna has only two resonance points, and the frequency band S11 between the resonance points is greater than-14 dB, which does not meet the index requirement of the base station antenna. The antenna after adding the parasitic patch 2 generates three resonance points (1.83 GHz, 2.76GHz and 3.37 GHz) in the working frequency band, and S11 in the frequency band between the resonance points is smaller than-14 dB. Fig. 6 shows that the S parameter of the antenna provided by the invention is S11< -14dB in 1.72-3.45GHz (67%), S21 is smaller than-22 dB, and the working bandwidth is wider than that of a common dual-polarized base station antenna (about 45%).

As shown in fig. 8 and 9, the radiation characteristics of the antenna are shown, the in-band peak gain is higher than 6.1dBi, and the radiation performance is good.

The invention improves impedance matching by using the coupling between the parasitic patch 2 and the main radiation patch 1, and 3 resonance points are generated in the working frequency band by using the parasitic patch 2 as a high-frequency radiation unit, thereby realizing a wideband (67%, S11< -14 dB) antenna. Two orthogonally placed balun are used to excite two orthogonal polarizations respectively, achieving higher isolation (in-band isolation higher than 22 dB). The antenna has simple geometric topology and fewer size parameters, and is convenient for optimizing tuning according to actual requirements. The PCB where the two feed balun is located plays a role in supporting and fixing the antenna to radiate the PCB while feeding the antenna, so that the whole structure of the antenna has stability. The final antenna can be directly connected with the coaxial line feed, has a simple structure and is convenient for practical use.

The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.

Claims

1. A multi-resonance-point broadband + -45 DEG dual polarized antenna is characterized in that: the antenna comprises a radiation substrate (3), wherein a parasitic patch (2) is arranged on the lower surface of the radiation substrate (3), a main radiation patch (1) is arranged on the upper surface of the radiation substrate (3), a first slot (31) penetrating through the radiation substrate (3) is formed in the middle of the main radiation patch (1), one end of a feed structure (4) is connected with the main radiation patch (1) through the first slot (31), the other end of the feed structure passes through a second slot (51) formed in a metal floor (5) to be fixed on the metal floor (5), electromagnetic energy is coupled among the main radiation patches (1), the main radiation patches (1) and the parasitic patch (2), and 3 resonance points are generated in an operating frequency band of the antenna;

the main radiation patch (1) comprises four patch strips (6), the four patch strips (6) are positioned on the diagonal of the radiation substrate (3) and form a main radiation patch (1) with a cross structure, a cross gap I (7) is formed among the four patch strips (6), a first slot (31) penetrating through the radiation substrate (3) is formed in each patch strip (6), and the four patch strips (6) are coupled to generate a resonance point;

the parasitic patch (2) comprises eight triangular patches (8), two triangular patches (8) are arranged on the lower surface of the radiation substrate (3) in the four directions of up, down, left and right, and the two triangular patches (8) in each direction are arranged at the included angle position between the two patch strips (6); gaps are reserved between two triangular patches (8) in each direction, a cross-shaped gap II (9) is formed by the gaps between the two triangular patches (8) in the four directions, the cross-shaped gap II (9) and the cross-shaped gap I (7) are in an up-down corresponding relationship, the triangular patches (8) are additionally provided with coupling among patch strips (6), in-band impedance matching is improved, the triangular patches (8) can be used as high-frequency radiating units, and a new resonance point is generated.

2. The multi-resonance broadband + -45 deg. dual polarized antenna of claim 1, wherein: the feeding structure (4) comprises two orthogonal first feeding balun (41) and a second feeding balun (42), one ends of the first feeding balun (41) and the second feeding balun (42) are connected with the patch strip (6) through a first slot (31), and the other ends of the first feeding balun and the second feeding balun penetrate through a second slot (51) formed in the metal floor (5) to be fixed on the metal floor (5).