Folding dipole high-gain omnidirectional antenna array applied to 5G frequency band

Abstract

The utility model discloses a folded dipole high-gain omnidirectional antenna array applied to a 5G frequency band. The whole omnidirectional antenna array is composed of four folded dipole pairs; each array unit comprises two folding dipoles which are arranged in an axial symmetry manner; the feed network consists of two sections of 50-ohm microstrip lines and a plurality of sections of quarter-wavelength impedance matching lines; each folded dipole is a hollow rectangle formed by splicing a plurality of rectangular patches, current returns to the position below a current starting point through a rectangular line formed by winding the patches, and the total folding length is about one half of the wavelength corresponding to a required frequency point; a plurality of parasitic patches are arranged beside each folded dipole, so that the impedance matching of the antenna can be improved, and the bandwidth of the antenna can be deepened; a short-circuit copper column is arranged at the tail end of each folded dipole and is used for being connected with a ground plane; a 50-ohm coaxial line is used for feeding at the bottom of the omnidirectional antenna array, and an inner conductor and an outer conductor of the omnidirectional antenna array are connected with a top radiation patch and a bottom grounding surface of the antenna array respectively.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of folding dipole high-gain omnidirectional antenna array applied to 5G frequency band, belong to wireless technology communication field. BACKGROUND

[0002] Under the background of the rapid development of wireless modern communication technology, the exploration of unknown universe and the improvement of life quality of human being cannot be supported without communication technology.In this huge and complex system, antenna, as the functional element for converting energy between guided wave and free space wave, plays a crucial role in communication system.With the progress of technology, people's requirements for antenna performance are constantly improved, and the complex use environment poses new challenges to the design of traditional antenna.

[0003] The evolution of mobile communication technology has a certain impact on human communication mode.From the first generation of mobile communication technology (1G) in the 80s, communication technology will experience an important iteration every ten years.1G takes frequency division multiple access (FDMA) as the core, uses analog signal technology, and basically realizes the function of voice communication, but its application range is limited due to lack of data transmission capacity and poor security.In the 90s, the second generation of mobile communication technology (2G) declared that mobile communication entered the digital age, using time division multiple access (TDMA) technology, improved the voice quality, and first supported short message and basic internet access.However, 2G still cannot meet the rapidly growing information processing demand.

[0004] After entering the new century, the third generation of mobile communication technology (3G) takes code division multiple access (CDMA) technology as the core, significantly enhances the processing capacity of mobile data service, and becomes an important driver of mobile internet popularization.However, the explosive growth of data service demand exposes the deficiency of 3G in bandwidth.Therefore, the fourth generation of mobile communication technology (4G) emerges as the times require, relying on orthogonal frequency division multiplexing (OFDM) and multiple input multiple output (MIMO) technology, 4G realizes a leap in network bandwidth and data rate, supports high-definition video, real-time game and other big data applications, and becomes an important milestone of the combination of mobile communication and digital life.

[0005] With the diversification of application scene demand, the fifth generation of mobile communication technology (5G) is endowed with higher expectation.5G technology breaks through the communication limit between people, realizes the wide interconnection of people and things, and things, that is, "Internet of Everything".Compared with 4G, 5G has made great progress in rate, delay and connection density.Its core scenarios include enhanced mobile broadband (eMBB), massive machine type communication (mMTC) and ultra-reliable low latency communication (URLLC). UTILITY MODEL CONTENT

[0006] Wireless communication technology not only greatly changes the way of human communication, but also promotes the continuous innovation of antenna design technology. Under the leadership of 5G, communication technology is developing towards higher performance and wider application, laying the foundation for the multi-element needs of smart cities and future societies. Antennas with omnidirectional radiation patterns can cover the range of signals needed without dead angles, and have great appeal in wireless communication applications such as mobile communication and wireless local area network systems. Therefore, implementing high-gain omnidirectional antennas is the current design hotspot.

[0007] The utility model discloses a kind of folded dipole high-gain omnidirectional antenna arrays applied to 5G frequency band, which is designed to cooperate with the popularization of new communication technology. Covering the 5G frequency band specified by China, it has high gain under the condition of wide bandwidth, simple structure, easy processing and good application prospect.

[0008] The purpose of the utility model can be achieved by the following technical solutions:

[0009] A kind of folded dipole high-gain omnidirectional antenna arrays applied to 5G frequency band, characterized by comprising: the whole omnidirectional antenna array is composed of four folded dipole pairs;Each array unit contains two folded dipoles placed symmetrically along the axis;The feed network is composed of two 50-ohm microstrip lines and several quarter-wave impedance matching lines;Each folded dipole is composed of several rectangular patches to form a hollow rectangle, and the current returns to the lower part of the starting point after winding around the rectangular route formed by the patches, and the total length of the folded dipole is half of the wavelength corresponding to the required frequency point;Several parasitic patches are placed beside each folded dipole, which can improve the impedance matching of the antenna and deepen the bandwidth of the antenna;There is a short-circuit copper column at the end of each folded dipole for connection with the ground plane;The antenna array is fed by a 50-ohm coaxial line at the bottom, and the inner and outer conductors are connected to the top radiation patch and the bottom ground plane of the antenna array respectively;The overall antenna feed structure adopts a structure that feeds in parallel from the middle of the antenna first, and then feeds in series upwards and downwards.

[0010] The radiation surface of the omnidirectional antenna array is composed of folded dipole patch pairs, printed on the surface of a dielectric substrate. Each array unit contains two folded dipoles placed symmetrically along the axis, forming an omnidirectional antenna with high gain.

[0011] Each folded dipole is composed of patches, and its shape includes a rectangle, a square, or a circular ring.

[0012] The quarter-wave impedance transformation line at the connection between the folded dipole pair and the feed line can adjust the impedance matching of the overall antenna. By changing the total length of the folded dipole, the resonant frequency of the antenna can also be affected, thereby affecting the bandwidth of the overall antenna.

[0013] Wherein, by placing several parasitic patches beside each folded dipole, changing its position and size can effectively improve the impedance matching of the antenna.

[0014] Wherein, the radiation patches of the omnidirectional antenna array are located on both sides of the antenna, and the antenna pattern can be compressed by stacking several radiation patch structures, thereby improving the gain.

[0015] Wherein, the omnidirectional antenna array is folded on the traditional dipole, and the size of the antenna is effectively reduced while ensuring good radiation effect.

[0016] Wherein, the end of the upper folded dipole patch of the omnidirectional antenna array is connected to the ground plane through a short-circuit probe.

[0017] Wherein, the omnidirectional antenna array uses two feeding lines on the front and back; the front feeding line is connected to the radiation patch and the inner conductor of the coaxial line, and the back feeding line is connected to the outer conductor of the coaxial line.

[0018] Wherein, the omnidirectional antenna array uses a printed PCB board, and the feed uses a 50-ohm coaxial line feed, wherein the short-circuit copper column, the feed network and the radiation patch all have a metal thickness.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] The antenna has a simple structure, simple processing and stable performance. The antenna has a wide bandwidth, covers the required 5G frequency band, has high gain, and is suitable for application in small mobile base stations. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described below with reference to the accompanying drawings.

[0022] Figure 1 is a perspective view of the embodiment of the present application;

[0023] Figure 2 is a front view of the embodiment of the present application;

[0024] Figure 3 is a rear view of the embodiment of the present application;

[0025] Figure 4 is a reflection coefficient simulation result graph of the embodiment of the present application;

[0026] Figure 5 is a radiation simulation result graph of the embodiment of the present application;

[0027] Figure 6 is a gain simulation result graph of the embodiment of the present application;

[0028] In the figure, 1-front radiation patch; 2-feed coaxial line; 3-quarter wavelength impedance transformer; 4-short copper column; 5-parasitic patch; 6-front feed line; 7-ground plane feed line; 8-dielectric substrate. DETAILED DESCRIPTION

[0029] The utility model will be explained in detail below in combination with the drawings and specific embodiments. The embodiments are implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following embodiments.

[0030] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the utility model belongs.

[0031] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application; as used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0032] As shown in Figure 1 A folding dipole high-gain omnidirectional antenna array applied to a 5G frequency band: 1-front radiation patch; 2-feed coaxial line; 3-quarter wavelength impedance transformer; 4-short copper column; 5-parasitic patch; 6-front feed line; 7-ground plane feed line; 8-dielectric substrate;

[0033] As shown in Figure 2 , Figure 3 The radiation patch 1 is printed on the front of the dielectric substrate 8, the ground plane feed line is printed on the back of the dielectric substrate 8, the quarter wavelength impedance transformer 3 is located at the connection between the front feed line 6 and the front radiation patch 1, and the short copper column 4 connects the front radiation patch 1 and the ground plane feed line 7.

[0034] In the embodiment of the utility model, the front radiation patch 1, the short copper column 4, the front feed line 6 and the ground plane feed line 7 of the omnidirectional antenna array are of metal material, which can be red copper or stainless steel.

[0035] In the embodiment of the utility model, the total length of the folding dipole of the omnidirectional antenna array is less than or equal to the length corresponding to one-half wavelength of the center frequency of the working frequency band of the antenna.

[0036] In the embodiment of the utility model, the quarter wavelength impedance transformation line of the omnidirectional antenna array is located at the connection of the feed line and the radiation patch, the length and width of which can be adjusted to adjust the input impedance of the antenna, and the impedance matching of the antenna is realized, and the length is substantially equal to the length corresponding to the quarter wavelength of the center frequency of the working frequency band of the antenna.

[0037] In the embodiment of the utility model, the radiation patch of the upper layer of the dielectric substrate of the omnidirectional antenna array is connected between the ground plane feed line through the short copper column 4. The shape of the short probe 4 is generally circular or regular polygon.

[0038] In the embodiment of the utility model, the front radiation patch 1, the front feed line 6 and the ground plane feed line 7 of the antenna array have a metal thickness, but the thickness is not limited, and the thickness of the dielectric substrate 8 is not fixed.

[0039] As shown in Figure 4 , Figure 5 , Figure 6 According to the simulation results, the embodiment of the utility model has a good bandwidth in the specified 5G frequency band, the maximum gain is more than 7dB, and has a good omnidirectionality.

[0040] The above is only the preferred embodiment of the utility model, and is not limited in other forms, any skilled person in the art can change or modify the above disclosed technology content into equivalent embodiments. However, any simple modification, equivalent change and modification of the above embodiments without departing from the technical scheme of the utility model, according to the technical essence of the utility model, still belongs to the protection scope of the technical scheme of the utility model.

Claims

1. A folded dipole high-gain omnidirectional antenna array for use in the 5G band, characterized in that, include: The omnidirectional antenna array consists of four omnidirectional antenna elements, each of which includes a folded dipole pair. Each folded dipole pair comprises two folded dipoles placed symmetrically along an axis. The feeding network consists of two 50-ohm microstrip lines and several quarter-wavelength impedance matching lines. Each folded dipole is formed by splicing several rectangular patches into a hollow rectangle. The current returns to the starting point below the current through the rectangular path formed by the patches. The total folded length is half the wavelength corresponding to the desired frequency. Parasitic patches are placed next to each folded dipole, and a short-circuited copper pillar connected to the ground plane is set at the end of each folded dipole. The bottom of the omnidirectional antenna array is fed by a 50-ohm coaxial line, whose inner and outer conductors are connected to the top radiating patch and the bottom ground plane of each omnidirectional antenna element, respectively. The overall feeding structure of the omnidirectional antenna array adopts a structure of first feeding in parallel from the middle of the antenna, and then feeding in series upwards and downwards.

2. The folded dipole high-gain omnidirectional antenna array for 5G bands according to claim 1, characterized in that, The radiating surface of the omnidirectional antenna array consists of folded dipole patch pairs printed on the surface of a dielectric substrate; each array element contains two axisymmetrically placed folded dipoles to form a high-gain omnidirectional antenna.

3. A folded dipole high-gain omnidirectional antenna array for 5G bands according to claim 1, characterized in that, Each folded dipole is composed of patches that are joined together, and its shape can be rectangular, square, or toroidal.

4. A folded dipole high-gain omnidirectional antenna array for 5G bands according to claim 1, characterized in that, There is a quarter-wavelength impedance transformation line at the connection between the folded dipole pair and the feed line.

5. A folded dipole high-gain omnidirectional antenna array for 5G frequency bands according to claim 1, characterized in that, The structure for adjusting the impedance matching of an omnidirectional antenna element includes: placing a parasitic patch next to each folded dipole, and adjusting the impedance matching of the omnidirectional antenna element by changing the relative position of the parasitic patch and the folded dipole and changing the size of the parasitic patch.

6. A folded dipole high-gain omnidirectional antenna array for 5G frequency bands according to claim 1, characterized in that, Structures used to compress antenna patterns and increase gain include: radiating patches of an omnidirectional antenna array located on both sides of the antenna, and the antenna pattern is compressed and the gain is increased by stacking the radiating patches.

7. A folded dipole high-gain omnidirectional antenna array for 5G bands according to claim 1, characterized in that, Omnidirectional antenna arrays reduce antenna size by constructing folded dipole structures.

8. A folded dipole high-gain omnidirectional antenna array for 5G bands according to claim 1, characterized in that, The upper folded dipole patch of each omnidirectional antenna element is connected to the lower ground plane via a short-circuit probe.

9. A folded dipole high-gain omnidirectional antenna array for 5G frequency bands according to claim 1, characterized in that, The omnidirectional antenna array uses two feed lines, one on the front and one on the back. The feed line on the front is connected to the radiating patch and the inner conductor of the coaxial line, while the feed line on the back is connected to the outer conductor of the coaxial line.

10. A folded dipole high-gain omnidirectional antenna array for 5G bands according to claim 1, characterized in that: The omnidirectional antenna array uses a printed PCB board and is fed by a 50-ohm coaxial cable. The short-circuit copper pillars, the feed network, and the radiating patches all have metal thickness.

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