CN-120109526-B - Broadband dual-polarized indoor antenna with symmetrical beam broadening

CN120109526BCN 120109526 BCN120109526 BCN 120109526BCN-120109526-B

Abstract

The invention discloses a broadband dual-polarized indoor antenna with symmetrical beam broadening, which is characterized in that orthogonal embedded balun is positioned between orthogonal dual-polarized printed dipoles and square metal ground, bottom pins of the balun are used as signal feed ports, top pins of the balun are respectively inserted into rectangular through holes of a pair of dipoles correspondingly, four cross-shaped folded metal strips are respectively supported above the orthogonal dual-polarized printed dipoles by struts and are respectively arranged end to end along the polarization directions of the orthogonal two dipoles, four trapezoid right-angle bent plates are distributed at four opposite angles of the orthogonal dual-polarized printed dipoles, and the bottoms of the four trapezoid right-angle bent plates are connected with the square metal ground. The invention applies the symmetrically distributed cross hemmed metal strips and the trapezoid right angle bent plates to the orthogonal dual-polarized printed dipole, and utilizes the symmetrical beam broadening effect of the two on the E face and the H face of high frequency and low frequency and the expanding effect on the impedance matching bandwidth, thereby realizing wider double-sided symmetrical beam broadening bandwidth and impedance matching bandwidth.

Inventors

SHI JIN
Fan Gonghao
YU DENGHUI
QIN WEI
XU KAI
JIANG RUIRUI
ZHANG LINGYAN

Assignees

南通大学

Dates

Publication Date: 20260508
Application Date: 20250318

Claims (4)

1. The broadband dual-polarized indoor antenna with symmetrical beam broadening is characterized by comprising four cross-shaped folded metal strips (1), orthogonal dual-polarized printed dipoles (2), orthogonal embedded balun (3), four trapezoid right-angle bent plates (4), square metal ground (5) and a plurality of struts (6); the orthogonal dual-polarized printed dipole (2) comprises a dielectric substrate and four orthogonal metal strips with rectangular through holes on the surface of the dielectric substrate; the orthogonal embedded balun (3) consists of two vertically arranged balun orthogonals, wherein the orthogonal embedded balun (3) is positioned between the orthogonal dual-polarized printed dipole (2) and the square metal ground (5), and bottom bolts of the balun are used as signal feed ports and vertically penetrate through rectangular grooves on the square metal ground (5) respectively; The four cross-shaped folded metal strips (1) are respectively supported above the orthogonal dual-polarized printed dipoles (2) by the support posts (6), are divided into a group by two, and are respectively arranged end to end along the polarization directions of the two orthogonal dipoles; Four trapezoid right-angle bent plates (4) are distributed at four opposite angles of the orthogonal dual-polarized printed dipole (2), the bottom of each trapezoid right-angle bent plate is connected with a square metal ground (5), and two bending surfaces of each trapezoid right-angle bent plate (4) are respectively parallel to two orthogonal surfaces of the orthogonal embedded balun (3); Each cross-shaped flanging metal strip (1) consists of two horizontal short strips (1-1) with equal length, one horizontal long strip (1-2) and one vertical strip (1-3), the horizontal short strips (1-1) and the horizontal long strips (1-2) are all positioned in a horizontal plane, part of the length of the horizontal long strips (1-2) is overlapped with the metal strips of the dipoles in the vertical plane, and the vertical strips (1-3) positioned on the outer side are perpendicular to the horizontal plane.
2. Broadband dual polarized indoor antenna according to claim 1, characterized in that the trapezoid right angle bend plate (4) is formed by bending the metal sheet of isosceles trapezoid at 90 degrees along its own symmetry axis.
3. A broadband dual polarized indoor antenna according to claim 1 or 2, characterized in that the length of the horizontal short strip (1-1) is between 0.14λ 0 -0.16λ 0 , the length of the horizontal long strip (1-2) is between 0.19λ 0 -0.21λ 0 , the length of the overlap of the horizontal long strip (1-2) and the dipole is between 0.08λ 0 -0.12λ 0 , the length of the vertical strip (1-3) is between 0.18λ 0 -0.20λ 0 , λ 0 is the free space wavelength corresponding to the center frequency.
4. A broadband dual polarized indoor antenna according to claim 3, characterized in that the upper base of the trapezoidal right angle bend plate (4) has a total length of between 0.09 λ 0 -0.13λ 0 , the lower base has a total length of between 0.26 λ 0 -0.30λ 0 and a height of between 0.20 λ 0 -0.24λ 0 , and the spacing between the opposed parallel bend faces of adjacent two trapezoidal right angle bend plates (4) is between 0.18 λ 0 -0.22λ 0 .

Description

Broadband dual-polarized indoor antenna with symmetrical beam broadening Technical Field The invention relates to a microwave communication device, in particular to a broadband dual-polarized indoor antenna. Background An indoor antenna is a device for receiving and transmitting wireless signals in an indoor environment, whose main functions include enhancing signal strength, increasing transmission rate, and reducing interference. The wide-beam indoor antenna can enlarge the coverage area, effectively reduce signal blind areas and ensure continuous coverage under multi-room or complex layout, and the wide-beam antenna with symmetrically widened E-plane and H-plane can form more uniform coverage in indoor environment. Meanwhile, in a complex indoor or high-density scene, broadband dual-polarization work is required to improve the channel capacity, so that the requirements of multi-band and high-density equipment are met, more equipment is supported for concurrent connection, and network congestion is reduced. Therefore, the beam broadening of the broadband dual-polarized indoor antenna needs to be compatible with the wide beam bandwidths of the E face and the H face, the matching bandwidth and the beam width symmetry of two polarizations, so that the broadband dual-polarized indoor antenna with the beam symmetry broadening is formed, and the antenna has important engineering value and significance for indoor communication. The existing method for widening the beam width of the dual-polarized antenna mainly comprises the steps of widening the beam width by downwards inclining the metal ground of the dual-polarized dipole, widening the beam width only by widening the beam width of an H face, enabling the matching bandwidth and the beam widening bandwidth to be narrow, enabling the beam widening to be realized by adopting a low-profile dual-polarized magneto dipole and the small-size metal ground with metallization blind holes at four corners, enabling the beam widening to be only realized by adopting the same method, enabling the beam widening to be capable of realizing wide beam radiation of an H face, enabling the beam width of an E face to be narrow, enabling the matching bandwidth and the beam widening bandwidth to be in dual-band characteristics, enabling the bandwidth to be narrow, enabling the dual-band width to be narrow, enabling the dual-band square patch antenna to be still narrow, enabling the dual-polarized square patch antenna to be fed through reverse homopolar polarized currents on four T-shaped strips with holes extending outwards through patches, enabling a pair of back-to-back U-shaped strips to be capable of realizing beam widening, enabling the symmetry of the dual-face beam widening to be poor, enabling the whole plane size to be large, enabling the matching bandwidth and the beam widening to be narrow, and enabling the beam widening to be capable of being in square, enabling the width to be capable of being capable of realizing the dual-band widening to be wide, and enabling the width to be used to be wide. In summary, the above methods cannot achieve a wide beam broadening bandwidth, and part of the designs cannot achieve two-sided beam broadening and symmetry of the two-sided beam broadening, so it is necessary to propose a broadband dual-polarized indoor antenna with symmetrical beam broadening. Disclosure of Invention Aiming at the prior art, the invention provides a broadband dual-polarized indoor antenna for realizing double-sided beam broadening, and the matching, the beam broadening bandwidth and the symmetry of double-sided beam broadening are both considered. The technical scheme is that the broadband dual-polarized indoor antenna with symmetrical and widened wave beams comprises four cross-shaped folded metal strips, orthogonal dual-polarized printed dipoles, orthogonal embedded balun, four trapezoid right-angle bent plates, a square metal ground and a plurality of struts, wherein the orthogonal dual-polarized printed dipoles comprise a dielectric substrate and four orthogonal metal strips with rectangular through holes on the surface of the dielectric substrate, the orthogonal embedded balun is formed by orthogonal embedding of two vertically arranged balun plates, the orthogonal embedded balun is positioned between the orthogonal dual-polarized printed dipoles and the square metal ground, bottom bolts of the balun serve as signal feed ports and respectively vertically penetrate through rectangular grooves of the square metal ground, top bolts of the balun respectively correspond to and are inserted into the rectangular through holes of a pair of dipoles, the four cross-shaped folded metal strips are respectively supported above the orthogonal printed dipoles by the struts and are divided into a group in two pairs, are respectively arranged end to end along the polarization directions of the orthogonal two dipoles, the four trapezoid right-angle bent plates are distributed a