CN111463561A

CN111463561A - Array antenna and base station

Info

Publication number: CN111463561A
Application number: CN201911368310.8A
Authority: CN
Inventors: 吕洪辉
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-07-28

Abstract

The invention relates to the technical field of wireless, and provides an array antenna, an antenna subarray and a base station, wherein the array antenna comprises a bottom layer plastic medium substrate, a plastic bulge arranged on the bottom layer plastic medium substrate, a top layer plastic medium substrate and a radiation unit, wherein the top layer plastic medium substrate is overlapped on the plastic bulge, the radiation unit is electroplated on one surface, far away from the bottom layer plastic medium substrate, of the top layer plastic medium substrate, the array antenna further comprises a feed network, the feed network is electroplated and printed on the bottom layer plastic medium substrate and the plastic bulge, and the feed network comprises a one-to-two power divider and a differential coupling feed circuit electrically connected with the one-to-two power divider. In addition, the invention also provides a base station applying the array antenna. Compared with the prior art, the invention realizes the requirements of wide frequency band, low cost, miniaturization and light weight of the 5G base station antenna by adopting the differential coupling feed technology and the processing technology of plastic electroplating.

Description

Array antenna and base station

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of wireless, in particular to an array antenna and a base station.

[ background of the invention ]

With the advent of the fifth generation mobile communication technology, a large-scale array antenna (Massive MIMO) technology will be widely applied to the design of 5G base station antennas to improve data transmission rate and spectrum utilization. The traditional Massive MIMO base station antenna utilizes a PCB or a metal piece as a carrier of an antenna radiation unit and a feed network, and is connected and fixed through a welding process, so that the antenna is time-consuming and labor-consuming to assemble, the consistency is poor, and meanwhile, the weight of the antenna and the design cost of the antenna are increased.

[ summary of the invention ]

The invention provides a 5G base station array antenna based on a plastic electroplating process, which aims at the problems of time and labor waste and poor consistency of assembly of a welding process in the prior art, and meets the requirements of wide frequency band, low cost, miniaturization and light weight of the 5G base station antenna by adopting a differential coupling feed technology and a plastic electroplating processing process.

An array antenna comprises a bottom layer plastic medium substrate, a top layer plastic medium substrate fixed with the bottom layer plastic medium substrate of a stratum, a feed network arranged on the bottom layer plastic medium substrate, and a radiation unit arranged on the top layer plastic medium substrate, wherein the top layer plastic medium substrate is riveted with the bottom layer plastic medium substrate, a plastic bulge is arranged on the bottom layer plastic medium substrate, a groove is formed in the plastic bulge, and a boss matched with the groove is arranged on the top layer plastic medium substrate; the radiation unit is arranged on one surface, far away from the bottom plastic medium substrate, of the top plastic medium substrate in an electroplating mode, and the feed network is arranged on one surface, facing the top plastic medium substrate, of the bottom plastic medium substrate in an electroplating mode.

Preferably, the boss comprises at least two vertically connected subsections.

Preferably, the feed network comprises two feed ports, power divider lines extending from the respective feed ports, and differential coupling feed lines connected to ends of the power divider lines, and the differential coupling feed lines are used for generating signals with a phase difference of 180 °.

Preferably, the differential coupling feeder line comprises two sets of L-shaped open circuit transmission lines, each set of L-shaped open circuit transmission lines being distributed along one diagonal of the plastic bumps to generate ± 45 ° dual polarized waves.

Preferably, at least one of the feeding ports is provided with a branch for adjusting the impedance matching of the antenna.

Preferably, the lower surface of the bottom layer plastic medium substrate far away from the top layer plastic medium substrate is plated with a metal ground.

Preferably, the top plastic dielectric substrate is in a square shape with a cut angle, the upper surface of the top plastic dielectric substrate is electroplated into a radiation unit, and the cut angle part is used for adjusting a resonance point of the antenna.

Preferably, the top layer plastic medium substrate and the bottom layer plastic medium substrate are riveted through a plastic connecting piece.

The invention also provides a base station, which comprises the array antenna.

Compared with the prior art, the 5G base station array antenna based on the plastic electroplating process is characterized in that a differential coupling feed technology and a plastic electroplating processing process are adopted, a feed network at the bottom layer of the antenna and a radiation unit at the top layer of the antenna are directly electroplated on the surface of plastic and coupled, and finally the bottom layer plastic medium substrate and the top layer plastic medium substrate are fixed together through a plastic connecting piece to complete assembly without welding.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

fig. 1 is a schematic structural diagram of an array antenna according to an embodiment of the present invention;

fig. 2 is an exploded view of the array antenna shown in fig. 1;

FIG. 3 is a schematic structural view of the section A-A shown in FIG. 1;

FIG. 4 is a schematic structural diagram of the first top plastic dielectric substrate shown in FIG. 2;

FIG. 5 is a schematic structural diagram of the second top plastic dielectric substrate shown in FIG. 2;

FIG. 6 is a schematic front view of the bottom plastic dielectric substrate shown in FIG. 2 and a feed network thereon;

fig. 7 is a graph of standing-wave ratio of two feeding ports of the array antenna according to an embodiment of the present invention;

fig. 8 is a graph of array antenna isolation with frequency according to an embodiment of the present invention.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 2 and fig. 3, the present invention provides an array antenna 100 applied to a 5G base station, where the array antenna 100 includes a bottom plastic dielectric substrate 10, a first top plastic dielectric substrate 31 and a second top plastic dielectric substrate 32 fixed to the bottom plastic dielectric substrate 10, a feeding network 13 disposed on the bottom plastic dielectric substrate 10, a first radiation unit 51 disposed on the first top plastic dielectric substrate 31, and a second radiation unit 52 disposed on the second top plastic dielectric substrate 32. The first top layer plastic medium substrate 31 is riveted with the bottom layer plastic medium substrate 10, the second top layer plastic medium substrate 32 is riveted with the bottom layer plastic medium substrate 10, the bottom layer plastic medium substrate 10 is provided with a first plastic bulge 11 and a second plastic bulge 12, the first plastic bulge 11 is provided with a first groove 110, and the second plastic bulge 12 is provided with a second groove 120.

Referring to fig. 4 and fig. 5, a first boss 311 is disposed on the first top plastic dielectric substrate 31 and matches with the first groove 110; the second top plastic dielectric substrate 32 is provided with a second boss 321 matched with the second groove 120. The first boss 311 at least includes a first segment 3111 and a second segment 3112 vertically connected to each other, and the second boss 321 at least includes a first segment 3211 and a second segment 3212 vertically connected to each other. The first boss 311 is fitted into the first groove 110, and the second boss 321 is fitted into the first groove 120.

Referring to fig. 1 to 5, the first radiating element 51 is electroplated on a surface of the first top plastic dielectric substrate 31 away from the bottom plastic dielectric substrate 10, the second radiating element 52 is electroplated on a surface of the second top plastic dielectric substrate 32 away from the bottom plastic dielectric substrate 10, and the feeding network 13 is electroplated on a surface of the bottom plastic dielectric substrate 10 facing the first top plastic dielectric substrate 31 and the second top plastic dielectric substrate 32. The first top plastic dielectric substrate 31 is fixedly connected to the first plastic protrusion 11 by two first plastic rivets 71, and the second top plastic dielectric substrate 32 is fixedly connected to the second plastic protrusion 11 by two second plastic rivets 72. The bottom plastic dielectric substrate 10 is plated with a metal ground 91 on the lower surface away from the first top plastic dielectric substrate 31 and the second top plastic dielectric substrate 32.

Referring to fig. 2 and 6 in combination, a feeding network 13 is electroplated on the bottom plastic dielectric substrate 10 and the first and second

plastic bumps

11 and 12, the feeding network 13 includes two feeding ports 101, power divider lines 103 extending from the respective feeding ports 101, and first and second differential

coupling feeding lines

111 and 121 connected to ends of the power divider lines 103, the first and second differential

coupling feeding lines

111 and 121 are used for generating signals with a phase difference of 180 °, the first differential coupling feeding line 111 includes two sets of L-shaped open circuit transmission lines 112, the L-shaped open circuit transmission lines 112 are distributed along one side of a diagonal of the plastic bump 11, the two sets of L-shaped open circuit transmission lines 112 are used for generating dual-polarized waves with a phase difference of ± 45 °, the second differential coupling feeding line 121 includes two sets of L-shaped open circuit transmission lines 122, the L-shaped open circuit transmission lines 122 are distributed along one side of the diagonal of the plastic bump 12, the two sets of L-shaped open circuit transmission lines 122 are used for generating dual-polarized waves with a phase difference of ± 45 °, and the feeder port 1031 is used for adjusting impedance of at least one antenna.

Referring again to fig. 4 and 5, the first top plastic dielectric substrate 31 is in a square shape with a cut angle, the upper surface of the first top plastic dielectric substrate 31 is plated to form the first radiating element 51, and the cut angle portion 312 is used to adjust the resonance point of the antenna. The second top plastic dielectric substrate 32 is in a square shape with a cut angle, the upper surface of the second top plastic dielectric substrate 32 is plated to form a second radiation unit 52, and the cut angle portion 322 is used for adjusting a resonance point of the antenna.

Referring to fig. 3 again, in an embodiment, the overall height a of the array antenna 100 is 11.5mm, and the side length b of the radiating element is 30 mm.

The invention also provides a base station, and the base station applies the array antenna.

The array antenna provided by the invention works in 2500-: 3400 plus 3800MHz and 4800 plus 5000MHz are all within the protection scope of the patent.

Referring to fig. 7 and 8, fig. 7 is a standing wave ratio curve of the array antenna provided by the present invention with respect to frequency, curves V1 and V2 are standing wave ratio curves of two feed ports, and fig. 8 is a standing wave ratio curve of the array antenna provided by the present invention with respect to frequency, and it can be seen from fig. 7 and 8 that, when the array antenna operates at 2500 + 2700MHz, the standing wave ratio is less than 1.5, and the isolation is less than-25 dB.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims

1. An array antenna is characterized by comprising a bottom layer plastic medium substrate, a top layer plastic medium substrate fixed with the bottom layer plastic medium substrate, a feed network arranged on the bottom layer plastic medium substrate and a radiation unit arranged on the top layer plastic medium substrate, wherein the top layer plastic medium substrate is riveted with the bottom layer plastic medium substrate, a plastic bulge is arranged on the bottom layer plastic medium substrate, a groove is formed in the plastic bulge, and a boss matched with the groove is arranged on the top layer plastic medium substrate; the radiation unit is arranged on one surface, far away from the bottom plastic medium substrate, of the top plastic medium substrate in an electroplating mode, and the feed network is arranged on one surface, facing the top plastic medium substrate, of the bottom plastic medium substrate in an electroplating mode.

2. The array antenna of claim 1, wherein the boss comprises at least two vertically aligned sub-segments.

3. The array antenna of claim 1, wherein the feed network comprises two feed ports, a power splitter line extending from each of the feed ports, and a differentially coupled feed line connected to ends of the power splitter line, the differentially coupled feed lines configured to generate signals that are 180 ° out of phase.

4. The array antenna of claim 3, wherein the differentially coupled feed lines comprise two sets of L-shaped open-circuit transmission lines, each set of the L-shaped open-circuit transmission lines being distributed along one diagonal of the plastic bumps to produce ± 45 ° dual polarized waves.

5. The array antenna of claim 3, wherein at least one of the feed ports has a stub for adjusting antenna impedance matching.

6. The array antenna of claim 1, wherein the bottom plastic dielectric substrate has a lower surface that is plated with a metal ground away from the top plastic dielectric substrate.

7. The array antenna of claim 1, wherein the top plastic dielectric substrate is in a square shape with a cut angle, the upper surface of the top plastic dielectric substrate is plated with a radiating element, and the cut angle is used for adjusting a resonance point of the antenna.

8. The array antenna of claim 1, wherein the top layer plastic dielectric substrate and the bottom layer plastic dielectric substrate are riveted by a plastic connector.

9. A base station, characterized in that it comprises an array antenna according to any of claims 1 to 8.