[0001]CROSS-REFERENCE TO RELATED APPLICATIONS
[0002]This application claims the priority benefit of Chinese Patent Applications Ser. No. 201810070585.2 and filed on Jan. 25, 2018, the entire content of which is incorporated herein by reference.
[0003]TECHNICAL FIELD
[0004]The present disclosure relates to antenna technologies, and in particular, to an antenna system and a mobile terminal.
[0005]BACKGROUND
[0006]With the development of mobile communication technologies, mobile phones, PADs, notebook computers, and the like have gradually become important electronic products in life, and such electronic products have been updated to include an antenna system and therefore become electronic communication products having a communication function.
[0007]As the focus of research and development in the global industry, 5G has three main application scenarios: enhanced mobile broadband, large-scale machine communication, and high-reliability and low-latency communication. The three application scenarios respectively correspond to different key indicators, where a user peak velocity in the enhanced mobile broadband scenario is 20 Gbps, and a minimum user experience rate is 100 Mbps. A high carrier frequency and large bandwidth characteristic unique to millimeter waves is a main means to achieve a 5G ultra-high data transmission rate. Therefore, rich bandwidth resources of a millimeter wave frequency band provide a guarantee for the high-speed transmission rate.
[0008]However, due to severe spatial loss of electromagnetic waves in the millimeter wave frequency band, a wireless communication system using the millimeter wave frequency band needs to use a phased array architecture. Phases of array elements are distributed according to a particular rule by using a phase shifter, so that a high-gain beam is formed, and the beam is enabled, through a phase shift change, to scan within a particular space. A scanning coverage of a single phased array antenna is usually less than a hemisphere. If a communication terminal such as a mobile phone uses an antenna system in a form of a single array, a problem that a signal is unstable may be caused.
[0009]Therefore, it is necessary to provide a new antenna system and a communication terminal to resolve foregoing problems.
[0010]BRIEF DESCRIPTION OF THE DRAWINGS To illustrate the technical solutions in the embodiments of the present disclosure more clearly, the following briefly describes the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following descriptions merely show some embodiments of the present disclosure, and persons of ordinary skill in the art can derive other drawings from these accompanying drawings without creative efforts. FIG. 1 is a schematic structural diagram of a mobile terminal according to the present disclosure; FIG. 2 is a schematic structural diagram of an antenna assembly according to the present disclosure; FIG. 3 a and FIG. 3 b are schematic structural diagrams of a radiating antenna according to the present disclosure; FIG. 4 is a schematic diagram of a layout location of an antenna system according to the present disclosure; FIG. 5 is a directional diagram of a radiating antenna according to the present disclosure; FIG. 6 is a diagram of coverage efficiency of an antenna system according to the present disclosure; and FIG. 7 is a diagram of an overall scanning mode of an antenna system according to the present disclosure.
[0011]DETAILED DESCRIPTION
[0012]The following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are some of the embodiments of the present disclosure rather than all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.
[0013]Referring to FIG. 1 , an embodiment of the present disclosure provides a mobile terminal 100 , for example, a mobile phone, including a 3D glass housing 1 , and a PCB board 2 and an antenna system that are accommodated in the 3D glass housing 1 . The antenna system includes at least one antenna assembly 3 .
[0014]Referring to both FIG. 1 and FIG. 2 , the antenna assembly 3 includes a flexible circuit board 30 that is accommodated in the 3D glass housing 1 and that is bonded with and fixed to the PCB board 2 . One end of the flexible circuit board 30 is bonded with and fixed to the PCB board 2 , and the other end is bent to be closely attached to an inner side surface of the 3D glass housing 1 .
[0015]The flexible circuit board 30 includes a first portion 301 that is bent and extends toward a first direction and a second portion 302 that is bent and extends toward a second direction. The first direction and the second direction may be the same direction, or may be different directions. In specific embodiments provided in the present disclosure, the first direction is perpendicular to the second direction.
[0016]The antenna assembly 3 includes a first antenna array 31 disposed on the first portion 301 and a second antenna array 32 disposed on the second portion 302 . The first antenna array 31 and the second antenna array 32 are configured to radiate and receive electromagnetic waves. The first antenna array 31 and the second antenna array 32 may be bent respectively with the first portion 301 and the second portion 302 , so that the first antenna array 31 and the second antenna array 32 are closely attached to the inner side surface of the 3D glass housing 1 respectively by using the first portion 301 and the second portion 302 . Specifically, the first antenna array 31 and the second antenna array 32 are respectively printed on the first portion 301 and the second portion 302 , so that the thickness of the antenna assembly 3 is greatly reduced and the antenna assembly 3 is easily bent with the flexible circuit board 30 on the premise that the structural stability of the first antenna array 31 and the second antenna array 32 is ensured.
[0017]The first antenna array 31 includes a plurality of radiating antennas 310 , and the second antenna array 32 includes a plurality of radiating antennas 320 . In this embodiment, there are four radiating antennas 310 . Specifically referring to FIG. 3 a and FIG. 3 b , the radiating antenna 310 includes a radiating portion 310 a and a director 310 b , and the radiating portion 310 a is spaced away from and coupled to the director 310 b . The director 310 b has a directing function. Specifically, the director 310 b directs a radiation beam of the radiating antenna 310 toward a direction in which the director 310 b is located, to implement beam tilting. Using the coordinate axes in FIG. 3 a and FIG. 3 b for reference, the radiating portion 310 a of the radiating antenna 310 is arranged on an XY plane; when the director 310 b is not disposed, a radiation beam thereof is perpendicular to the XY plane and faces a Z-axis positive axis direction; when the director 310 b is disposed, the radiation beam originally pointing to the Z-axis positive axis is tilted toward an X-axis positive axis direction, that is, toward the direction of the director 310 b , and a directivity pattern thereof is shown in FIG. 5 .
[0018]In this embodiment, as shown in FIG. 4 , the 3D glass housing 1 includes a 3D glass side wall 11 . The antenna system includes two antenna assemblies 3 , which are respectively a first antenna assembly 3 a and a second antenna assembly 3 b . Each of the antenna assemblies includes the first antenna array 31 and the second antenna array 32 , and the first antenna array 31 and the second antenna array 32 are both attached to an inner side surface of the 3D glass side wall 11 . Specifically, the 3D glass side wall 11 includes a first long-edge side wall 111 , a first short-edge side wall 112 , a second long-edge side wall 113 , and a second short-edge side wall 114 that are connected end to end. The first antenna assembly 3 a is disposed at a corner at a joint between the first long-edge side wall 111 and the first short-edge side wall 112 , and the second antenna assembly 3 b is disposed at a corner at a joint between the second long-edge side wall 113 and the second short-edge side wall 114 . The first antenna array 31 of the first antenna assembly 3 a is attached to an inner side surface of the first long-edge side wall 111 , the second antenna array 32 of the first antenna assembly 3 a is attached to an inner side surface of the first short-edge side wall 112 , the first antenna array 31 of the second antenna assembly 3 b is attached to an inner side surface of the second long-edge side wall 113 , and the second antenna array 32 of the second antenna assembly 3 b is attached to an inner side surface of the second short-edge side wall 114 . The antenna array is placed on the 3D glass side wall 11 , to reduce the effect of a metal body in the mobile terminal 100 on radiation performance of the radiating antennas 310 and 320 , and reduce loss in electromagnetic wave space.
[0019]In this embodiment, in the antenna system shown in FIG. 4 , the director 310 b in the first antenna array 31 and the second antenna array 32 of each antenna assembly is in an opposite location relationship with the radiating portion 310 a , so that radiating beams of two antenna arrays in the same antenna assembly are tilted toward opposite directions. For example, in the first antenna assembly 3 a , the director 310 b of the first antenna array 31 is located in the X-axis positive axis direction relative to the radiating portion 310 a , the director 310 b of the second antenna array 32 is located in the X-axis negative axis direction relative to the radiating portion 310 a , and then a radiating beam of the first antenna array 31 faces an outward direction of the first long-edge side wall 111 and is tilted toward the X-axis positive axis direction, and a radiating beam of the second antenna array 32 faces an outward direction of the first short-edge side wall 112 and is tilted toward the X-axis negative axis direction. Similarly, in the second antenna assembly 3 b , the radiating beam of the first antenna array 31 faces an outward direction of the second long-edge side wall 113 and is tilted toward the X-axis positive axis direction, and the radiating beam of the second antenna array 32 faces an outward direction of the second short-edge side wall 114 and is tilted toward the X-axis negative axis direction. In this way, each direction can be covered by radiating beams by using the first antenna assembly 3 a and the second antenna assembly 3 b and four antenna arrays therein. In this way, a high gain and a high coverage efficiency of the antenna system can be implemented. Specifically, as shown in FIG. 6 and FIG. 7 , full space beam coverage is basically implemented, and the coverage efficiency is high.
[0020]It should be noted that in other embodiments, beam tilting directions of the first antenna array 31 and the second antenna array 32 are opposite to those in this embodiment, and are not limited, provided that beam radiation is in directions around the mobile terminal by using a combination of two antenna assemblies.
[0021]In a preferred embodiment of the present disclosure, the radiating antennas 310 and 320 are millimeter wave antennas, so that the antenna assembly 3 has a higher signal transmission rate.
[0022]In this embodiment, the antenna system further includes a phase shifter 33 disposed on the PCB board, and each of the antenna assemblies is electrically connected to the phase shifter 33 to implement beam scanning.
[0023]The antenna assembly 3 further includes an antenna control circuit, a feeding network, and the like that are disposed on the PCB board 2 . The antenna control circuit is connected to the first antenna array 31 and the second antenna array 32 , to implement integration with a main board in the mobile terminal 100 .
[0024]Compared with related technologies, the antenna assembly 3 provided in the present disclosure has the following beneficial effects:
[0025]1) the feeding network, the phase shifter, and an antenna control circuit such as the control circuit are disposed on the PCB board 2 , to implement integration with a main board;
[0026]2) the radiating antenna is attached to the flexible circuit board 30 , to facilitate bending, and implement close attachment between the radiating antenna and the 3D glass housing 1 ;
[0027]3) the radiating antenna is placed on the 3D glass side wall 11 , to reduce the effect of the metal body in the mobile terminal 100 on radiation performance of the radiating antenna, and reduce loss in electromagnetic wave space;
[0028]4) the radiating antenna is placed on the flexible circuit board 30 , and the feeding network, the phase shifter, and the antenna control circuit such as the control circuit are disposed on the PCB board 2 , so that the overall size of the radiating antenna is greatly reduced while the internal space of the mobile terminal 100 is fully used;
[0029]5) the flexible circuit board 30 is used to implement close attachment between the radiating antenna and the 3D glass housing 1 , and in this way, the radiation performance of the radiating antenna is not affected, and a directivity pattern distortion generated by air existing between the 3D glass housing 1 and the radiating antenna is also avoided;
[0030]6) the radiating antenna is closely attached to an inner side surface of the 3D glass housing 1 by using the flexible circuit board 30 , so that the antenna assembly 3 has higher mechanical stability and is not damaged, does not fail, or does not deteriorate in radiation performance due to reasons such as drop or vibration; and
[0031]7) the antenna assembly includes two antenna arrays, and by using a beam tilting technology, one mobile terminal can implement full space beam coverage by using only two antenna assemblies, so that the number of antenna arrays is reduced.
[0032]The foregoing descriptions are merely embodiments of the present disclosure. It should be pointed out herein that a person of ordinary skill in the art may further make improvements without departing from the inventive concept of the present disclosure. The improvements all fall within the protection scope of the present disclosure.
