CN212114006U

CN212114006U - Sub-6G multi-band antenna system and mobile terminal

Info

Publication number: CN212114006U
Application number: CN201922416466.0U
Authority: CN
Inventors: 韩崇志; 袁涛; 杨国敏; 金亚秋
Original assignee: Kunshan Yiqu Information Technology Research Institute Co ltd
Current assignee: Kunshan Yiqu Information Technology Research Institute Co ltd
Priority date: 2019-12-29
Filing date: 2019-12-29
Publication date: 2020-12-08
Anticipated expiration: 2029-12-29

Abstract

The utility model provides a Sub-6G multifrequency section antenna system and mobile terminal, this antenna system includes metal floor, first radiation arm, second radiation arm and matching tuning network, first radiation arm includes first metal section and second metal section, the one end of first metal section is connected in metal floor, the other end of first metal section is connected in the second metal section, the second radiation arm includes third metal section and fourth metal section, the one end of third metal section is connected in metal floor, the other end of third metal section is connected in the fourth metal section; the length of the first radiation arm is 10-30mm, the length of the second radiation arm is 4-10mm, and the distance between the second metal section and the metal floor and the distance between the fourth metal section and the metal floor are both 0.5-3 mm. The utility model provides a Sub-6G multifrequency section antenna system and mobile terminal, this antenna system can cover a plurality of frequency channels, can increase the frequency channel that covers through matching tuning network moreover to can reduce the quantity of antenna, reduce the overall arrangement degree of difficulty that piles up of antenna.

Description

Sub-6G multi-band antenna system and mobile terminal

Technical Field

The utility model belongs to the technical field of the antenna, more specifically say, relate to a Sub-6G multifrequency section antenna system.

Background

With the continuous development of 5G technology, 5G commercialization is becoming possible. The Ministry of industry and communications has issued 5G commercial license plates to China Mobile, China Telecommunications, China Unicom and China radio and television, and the frequency bands of the currently published domestic 5G FR1(Sub-6GHz band) are three frequency bands of N41, N78 and N79 respectively.

For the international market, the frequency bands of 5G FR1(Sub-6GHz band) supported by the existing european and asian mainstream operators include N28, N20, N5, N1, N3, N7, N77, N78, etc., wherein the LB frequency band only needs to support 1T2R, and the MHB and UHB frequency bands all have the requirement of at least 4 receiving channels.

For the existing miniaturized terminal equipment, the number and the frequency bands supported by the antenna brought by the 5G era are increased, so that the original tense stacking layout can meet the more serious challenge.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a Sub-6G multifrequency section antenna system to solve 5G antenna frequency channel and increase in quantity among the prior art, be difficult to the technical problem of overall arrangement in miniaturized terminal.

In order to achieve the above object, the utility model adopts the following technical scheme: the Sub-6G multiband antenna system comprises a metal floor, a first radiating arm, a second radiating arm and a matching tuning network, wherein the first radiating arm and the second radiating arm are arranged on the same side of the metal floor, the matching tuning network is arranged on the same side of the metal floor, the first radiating arm comprises a first metal section and a second metal section which are connected in a bending mode, one end of the first metal section is connected to the metal floor, the other end of the first metal section is connected to the second metal section, the second radiating arm comprises a third metal section and a fourth metal section which are connected in a bending mode, one end of the third metal section is connected to the metal floor, and the other end of the third metal section is connected to the fourth metal section; the length of the first radiation arm is 10-30mm, the length of the second radiation arm is 4-10mm, and the distance between the second metal section and the metal floor and the distance between the fourth metal section and the metal floor are both 0.5-3 mm; the feed point is arranged on the second metal section, the matching tuning network comprises a matching circuit and a tuning circuit, the feed point, the matching circuit, the tuning circuit and the second metal section are sequentially connected, the tuning circuit comprises an impedance tuning switch and a plurality of inductors with different inductance values, each channel of the impedance tuning switch is connected with one inductor, and the inductors are grounded.

In one embodiment, the second metal segment is disposed parallel to an edge of the metal floor adjacent thereto, and the fourth metal segment is disposed parallel to an edge of the metal floor adjacent thereto.

In one embodiment, a ratio of a distance from the feeding point to an end of the second metal segment away from the metal ground to the length of the first radiating arm is between 0.2 and 0.4.

In one embodiment, the Sub-6G multiband antenna system has a frequency band with a reflection coefficient less than-6 dB covering N1, N3, N7, N41, N77, N78 and N78 bands.

In one embodiment, the length of the first radiating arm is 20mm, the length of the second radiating arm is 6mm, the distance between the second metal segment and the metal floor is 1mm, the distance between the fourth metal segment and the metal floor is 1mm, and the distance between the feeding point and one end of the second metal segment far away from the metal floor is 8 mm.

The utility model also provides a mobile terminal, including foretell Sub-6G multifrequency section antenna system.

In one embodiment, the metal floor is a circuit board or a metal bottom case; the first radiation arm and the second radiation arm are one side of the metal frame, metal branches on a circuit board, FPC wiring or LDS wiring.

The utility model provides a Sub-6G multifrequency section antenna system and mobile terminal's beneficial effect lies in: compared with the prior art, the utility model discloses Sub-6G multifrequency section antenna system, including metal floor, first radiation arm, second radiation arm and matching tuning network, first radiation arm and second radiation arm all are the setting of bending to reduce the space that this antenna system occupy, be applicable to the compactedness of small-size terminal overall arrangement. The distance between the second metal section and the metal floor and the distance between the fourth metal section and the metal floor are both 0.5-3mm, so that the space occupied by the antenna system is small, the length of the first radiating arm is 10-30mm, the length of the second radiating arm is 4-10mm, the feeding point is arranged on the second metal section and respectively corresponds to a fundamental mode in the form of a monopole of the first antenna radiating arm, a mode from the feeding point to the 1/4 lambda mode far away from one end of the metal floor and a parasitic mode of the second antenna radiating arm, and therefore multiple frequency bands can be covered. In addition, the tuning circuit comprises an impedance tuning switch, and more frequency bands can be tuned by switching to different channels and connecting with different inductors. Therefore, a plurality of frequency bands can be covered by arranging one antenna system, so that the number of the antennas can be reduced, and the stacking layout difficulty of the antennas is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a Sub-6G multiband antenna system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a matching circuit of a Sub-6G multiband antenna system according to an embodiment of the present invention;

FIG. 3 is a reflection coefficient curve diagram of a Sub-6G multiband antenna system according to an embodiment of the present invention;

fig. 4 is a graph of the efficiency curve of the Sub-6G multiband antenna system according to the embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

1-metal floor; 2-a first radiating arm; 21-a first metal segment; 22-a second metal segment; 3-a second radiating arm; 31-a third metal segment; 32-a fourth metal segment; 4-a feeding point; 5-matching a tuning network; 51-matching circuit; 52-tuning the circuit.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

The Sub-6G multiband antenna system provided by the embodiment of the present invention will now be described.

Referring to fig. 1 and 2, in one embodiment of the Sub-6G multiband antenna system, the Sub-6G multiband antenna system includes a metal floor 1, a first radiation arm 2, a second radiation arm 3 and a matching tuning network 5, wherein the first radiation arm 2 and the second radiation arm 3 are disposed on the same side of the metal floor 1. The first radiation arm 2 comprises a first metal section 21 and a second metal section 22 which are connected in a bending mode, the second radiation arm 3 comprises a third metal section 31 and a fourth metal section 32 which are connected in a bending mode, so that the second metal section 22 and the fourth metal section 32 are arranged along the edge of the metal floor 1 in an extending mode, and the occupied area of the multi-band antenna system is reduced. The distance between the second metal section 22 and the metal floor 1 and the distance between the fourth metal section 32 and the metal floor 1 are both 0.5-3mm, so as to reduce the area occupied by the multiband antenna system, but when the distance between the second metal section 22 and the metal floor 1 and the distance between the fourth metal section 32 and the metal floor 1 are too small, the environment of the antenna is severe, and the efficiency is significantly reduced, so that the distances are selected to be 0.5-3mm under the condition of ensuring both small volume and certain antenna efficiency. The length of the first radiating arm 2 is 10-30mm, the length of the second radiating arm 3 is 4-10mm, and the feeding point 4 is arranged on the second metal section 22, so that the frequency band covered by the antenna system is within the Sub-6G frequency band (the length of the radiating arm affects the resonant frequency, the longer the radiating arm, the smaller the resonant frequency, the shorter the radiating arm, and the larger the resonant frequency). Three resonance modes are correspondingly formed from the feeding point 4 to one end, far away from the metal floor 1, of the first radiation arm 2, from the feeding point 4 to one end, connected with the metal floor 1, of the first radiation arm 2 and the second radiation arm 3, wherein the three resonance modes are a fundamental mode, an 1/4 lambda mode and a parasitic mode in a monopole mode respectively, and at least cover a Sub-6G frequency band in China. The second radiating arm 3 mainly acts as a parasitic effect, adding an additional high-frequency mode, and facilitating the implementation of N78 and N79. The matching tuning network 5 comprises a matching circuit 51 and a tuning circuit 52, the feeding point 4 is arranged on the second metal section 22, the feeding point 4, the matching circuit 51, the tuning circuit 52 and the second metal section 22 are sequentially connected, the tuning circuit 52 comprises an impedance tuning switch and a plurality of inductors with different inductance values, each channel of the impedance tuning switch is connected with one inductor, and the inductors are grounded. More specifically, one end of the matching tuning network 5 is connected to the second metal segment 22 through a microstrip line, and the other end is connected to the feeding point 4 through the matching circuit 51, and the radio frequency signal is mutually transmitted with the first radiation arm 2 and the second radiation arm 3 through the feeding point 4. It is clear that the specific structure of the matching circuit 51 is not limited, and the form of realizing three resonance by the inductor-capacitor sequence exchange, the adjustment of the inductor-capacitor value or other more complicated matching circuits 51 is all within the protection scope of the present invention. The impedance tuning switch in the tuning circuit 51 is actually equivalent to a single-pole multi-throw switch, and when the impedance tuning switch is connected to different stationary terminals, the impedance tuning switch is connected with different inductors to form different channels, so that the antenna system covers the Sub-6GHz frequency bands of MHB and UHB, namely the Sub-6GHz frequency bands commonly used in the world and China.

The Sub-6G multiband antenna system comprises a metal floor 1, a first radiation arm 2, a second radiation arm 3 and a matching tuning network 5, wherein the first radiation arm 2 and the second radiation arm 3 are arranged in a bent mode, so that the space occupied by the antenna system is reduced, and the Sub-6G multiband antenna system is suitable for compactness of small-size terminal layout. The distance between the second metal segment 22 and the metal floor 1 and the distance between the fourth metal segment 32 and the metal floor 1 are both 0.5-3mm, so that the space occupied by the antenna system is small, the length of the first radiating arm 2 is 10-30mm, the length of the second radiating arm 3 is 4-10mm, and the feeding point 4 is arranged on the second metal segment 22 and respectively corresponds to a fundamental mode in the form of a monopole of the first radiating arm, a 1/4 lambda mode from the feeding point 4 to one end far away from the metal floor 1 and a parasitic mode of the second radiating arm 3. In addition, the tuning circuit 52 includes impedance tuning switches that can be switched to different channels and connected to different inductors to tune more frequency bands. Therefore, a plurality of frequency bands can be covered by arranging one antenna system, so that the number of the antennas can be reduced, and the stacking layout difficulty of the antennas is reduced.

Referring to fig. 1, in one embodiment of the Sub-6G multiband antenna system, the second metal segment 22 is disposed parallel to the edge of the metal floor 1 adjacent to the second metal segment, and the fourth metal segment 32 is disposed parallel to the edge of the metal floor 1 adjacent to the second metal segment, so that each part of the second metal segment 22 is affected by the metal floor 1 the same, and each part of the fourth metal segment 32 is affected by the metal floor 1 the same, and a more stable operating frequency band can be tuned. The distance between the second metal segment 22 and the metal floor 1 and the distance between the fourth metal segment 32 and the metal floor 1 may be 1mm, 2mm, 3mm, etc., and is selected according to the specific structure and layout space of the terminal where it is applied.

Referring to fig. 1, in one embodiment of the Sub-6G multiband antenna system, a ratio of a distance from the feeding point 4 to an end of the second metal segment 22 away from the metal floor 1 to a length of the first radiating arm 2 is between 0.2 and 0.4. The distance from the feeding point 4 to the end of the second metal segment 22 away from the metal floor 1 is one quarter λ, where λ is the resonant frequency.

In one embodiment of the Sub-6G multiband antenna system, the frequency bands having a reflection coefficient of less than-6 dB cover the N1, N3, N7, N41, N77, N78, and N78 bands. Wherein, the uploading frequency band of N1 is 1920-1980MHz, the downloading frequency band of N1 is 2110-2170MHz, the uploading frequency band of N3 is 1710-1785MHz, the downloading frequency band of N3 is 1805-1880MHz, the uploading frequency band of N7 is 25000-2570MHz, the downloading frequency band of N7 is 2620-2690MHz, the downloading frequency band of N41 is 2515-2675MHz, the downloading frequency band of N78 is 3400-3600MHz, the downloading frequency band of N79 is 4800-4900MHz, which are 5G FR1 frequency bands commonly used in China and China. Therefore, the Sub-6G multiband antenna system can cover 5G FR1 frequency bands commonly used in the world and China, reduce the number of antennas, and can meet the current four-channel MIMO requirement by only adding 4 groups of antenna systems in the form under the existing frequency band requirement, thereby reducing the number of 5G antennas to the maximum extent.

Referring to fig. 1, in one embodiment of the Sub-6G multiband antenna system, the length of the first radiating arm 2 is 20mm, the length of the second radiating arm 3 is 6mm, the distance between the second metal segment 22 and the metal floor 1, the distance between the fourth metal segment 32 and the metal floor 1 are 1mm, and the distance between the feeding point 4 and one end of the second metal segment 22 far from the metal floor 1 is 8 mm. In this embodiment, please refer to fig. 2, fig. 2 is a matching tuning network 5 used in the embodiment of fig. 1, and the connection manner of the capacitance and inductance of the matching tuning network 5 and the values of the capacitance and inductance are shown in fig. 2. In this embodiment, the impedance tuning switch has three channels in total, and can switch to realize tuning of three conditions.

Furthermore, on the basis of the above embodiments, a graph of the reflection coefficient S of the antenna system is shown in fig. 3, where the abscissa in fig. 3 is frequency, the ordinate is the reflection coefficient S, and all the frequency bands with the reflection coefficient S less than-6 dB are available frequency bands. In fig. 3, there are three curves, one for each tuning channel. Therefore, as can be seen from fig. 3, the N1 frequency band, the N3 frequency band, the N7 frequency band, the N41 frequency band, the N77 frequency band, the N78 frequency band, and the N78 frequency band are all within the available frequency bands of the antenna system, and the requirement of the 5G frequency band can be satisfied by using a single antenna system.

Further, in the above embodiments, the antenna efficiency graph of the above embodiments is shown in fig. 4, where the abscissa in fig. 4 is frequency, the ordinate is antenna efficiency, and an antenna with an antenna efficiency greater than-5 dB is a usable antenna. The curve L is the radiation efficiency of the antenna system in this embodiment, and the other curves are the total efficiency corresponding to the tuning network when switching different channels of the impedance tuning switch, and corresponding to the S parameter in fig. 3, the peak efficiency is more than-5 dB for each frequency covered by the resonance, which can meet the antenna performance requirement of a general mobile terminal. The peak efficiency is above-5 dB in N1 frequency band, N3 frequency band, N7 frequency band, N41 frequency band, N77 frequency band, N78 frequency band and N78 frequency band, and the antenna performance requirement of a common mobile terminal can be met.

The utility model also provides a mobile terminal, mobile terminal include the Sub-6G multifrequency section antenna system of any above-mentioned embodiment.

The mobile terminal of the embodiment adopts the Sub-6G multi-band antenna system, the Sub-6G multi-band antenna system comprises a metal floor 1, a first radiation arm 2, a second radiation arm 3 and a matching tuning network 5, and the first radiation arm 2 and the second radiation arm 3 are arranged in a bent mode, so that the space occupied by the antenna system is reduced, and the antenna system is suitable for compactness of layout of a small terminal. The distance between the second metal segment 22 and the metal floor 1 and the distance between the fourth metal segment 32 and the metal floor 1 are both 0.5-3mm, so that the space occupied by the antenna system is small, the length of the first radiating arm 2 is 10-30mm, the length of the second radiating arm 3 is 4-10mm, and the feeding point 4 is arranged on the second metal segment 22 and respectively corresponds to a fundamental mode in the form of a monopole of the first radiating arm, a 1/4 lambda mode from the feeding point 4 to one end far away from the metal floor 1 and a parasitic mode of the second radiating arm 3. In addition, the tuning circuit 52 includes impedance tuning switches that can be switched to different channels and connected to different inductors to tune more frequency bands. Therefore, a plurality of frequency bands can be covered by arranging one antenna system, so that the number of the antennas can be reduced, and the stacking layout difficulty of the antennas is reduced.

Optionally, the metal floor 1 is a circuit board or a metal bottom case in the mobile terminal. The first radiation arm 2 and the second radiation arm are one side of a metal frame, a metal branch (copper-clad branch), an FPC (flexible printed circuit) or an LDS (laser direct structuring) on a circuit board, and specific forms of the metal floor 1, the first radiation arm 2 and the second radiation arm 3 are not limited herein.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

A Sub-6G multiband antenna system, characterized in that: the antenna comprises a metal floor, a first radiation arm, a second radiation arm and a matching tuning network, wherein the first radiation arm and the second radiation arm are arranged on the same side of the metal floor, the matching tuning network is arranged on the same side of the metal floor, the first radiation arm comprises a first metal section and a second metal section which are connected in a bending mode, one end of the first metal section is connected to the metal floor, the other end of the first metal section is connected to the second metal section, the second radiation arm comprises a third metal section and a fourth metal section which are connected in a bending mode, one end of the third metal section is connected to the metal floor, and the other end of the third metal section is connected to the fourth metal section; the length of the first radiation arm is 10-30mm, the length of the second radiation arm is 4-10mm, and the distance between the second metal section and the metal floor and the distance between the fourth metal section and the metal floor are both 0.5-3 mm; the feed point is arranged on the second metal section, the matching tuning network comprises a matching circuit and a tuning circuit, the feed point, the matching circuit, the tuning circuit and the second metal section are sequentially connected, the tuning circuit comprises an impedance tuning switch and a plurality of inductors with different inductance values, each channel of the impedance tuning switch is connected with one inductor, and the inductors are grounded.
2. The Sub-6G multiband antenna system of claim 1, wherein: the second metal section is arranged in parallel with the edge of the metal floor adjacent to the second metal section, and the fourth metal section is arranged in parallel with the edge of the metal floor adjacent to the fourth metal section.
3. The Sub-6G multiband antenna system of claim 1, wherein: the ratio of the distance from the feeding point to one end of the second metal segment far away from the metal floor to the length of the first radiating arm is between 0.2 and 0.4.
4. The Sub-6G multiband antenna system of claim 1, wherein: the frequency band with the reflection coefficient smaller than-6 dB of the Sub-6G multiband antenna system covers an N1 frequency band, an N3 frequency band, an N7 frequency band, an N41 frequency band, an N77 frequency band, an N78 frequency band and an N78 frequency band.
5. The Sub-6G multiband antenna system of claim 4, wherein: the length of first radiation arm is 20mm, and the length of second radiation arm is 6mm, the second metal section with the distance on metal floor, the fourth metal section with the distance on metal floor is 1mm, the feed point with the distance that the second metal section kept away from metal floor one end is 8 mm.
6. A mobile terminal, characterized in that: comprising a Sub-6G multiband antenna system according to any of claims 1-5.
7. The mobile terminal of claim 6, wherein: the metal floor is a circuit board or a metal bottom shell; the first radiation arm and the second radiation arm are one side of a frame of the mobile terminal, a metal branch on a circuit board, an FPC (flexible printed circuit) wire or an LDS (laser direct structuring) wire.