TWI656752B - Antenna device and mobile terminal - Google Patents

Abstract

The invention relates to an antenna device, which comprises a metal casing, a main board, a radio frequency transceiver circuit and a matching capacitor. The metal casing is provided with a micro slit belt, and the micro slit belt has a first open end and a first closed end, and the first open end is located at On the edge of the metal casing, the first closed end is located away from the first open end of the microslit belt, and the micro slit belt is provided with a plurality of micro slits arranged side by side; the main board is provided with a slit to divide the main board part into an upper part and a lower part. The RF transceiver circuit is disposed at the lower portion, and the matching capacitor is electrically connected between the RF transceiver circuit and the upper portion of the motherboard, and the radiation signal of the RF transceiver circuit is radiated through the micro slit tape. The invention also provides a mobile terminal. The invention not only benefits the signal radiation of the radio frequency transceiver circuit, but also reduces the non-metal ratio of the metal casing.

Description

Antenna device and mobile terminal

The present invention relates to the field of antenna technologies, and in particular, to an antenna device and a mobile terminal.

With the development of technology and the increasing demands of users on the signal of electronic products, many mobile terminals with antennas such as mobile phones on the market currently use metal casings to ensure the intensity of use, satisfy the texture and enhance the user experience. sense. As is known to all, the metal is a signal shielding material. In order to avoid the effect of the signal shielding of the metal casing on the efficiency of the antenna, the casing usually adopts a combination of metal and non-metal, and in order to facilitate the radiation of the antenna signal, the proportion of the non-metal is relatively large, which affects the mobile terminal. structure.

The technical problem to be solved by the present invention is to provide an antenna device and a mobile terminal, which can improve the overall appearance of the mobile terminal.

The present invention provides an antenna device including a metal casing, a motherboard, a radio frequency transceiver circuit, and a matching capacitor. The metal casing has a micro slit tape, and the micro slit tape has a first open end and a first closed end disposed opposite to each other. The first open end is located on an edge of the metal casing, and the first closed end is located at a position of the microslit belt away from the first open end such that the micro slit tape will be the metal outer casing portion Separating, the microslit strip is provided with a plurality of micro slits arranged side by side; the motherboard is provided with a slit, the slit partitions the main board into upper and lower portions, and the radio frequency transceiver circuit is disposed on the host In a lower portion of the board, the matching capacitor is electrically connected between the radio frequency transceiver circuit and an upper portion of the motherboard, and a radiation signal of the radio frequency transceiver circuit is radiated through the micro slit tape.

Wherein the gap is opposite to the micro slit tape.

Wherein the slit has oppositely disposed second open ends and second closed ends, the second open end is located on an edge of the motherboard, and the second closed end is located at the gap away from the second open The position of the end.

The antenna device further includes an impedance matching circuit electrically connected between the radio frequency transceiver circuit and the matching capacitor.

Wherein, the antenna device further includes a switch and a grounding point disposed at the lower portion, the switch being electrically connected between the grounding point of the upper portion and the lower portion.

Wherein, the motherboard is grounded to the metal casing, and the location of the metal casing ground connection is disposed around the microslit belt.

The number of grounding points of the ground connection of the metal casing is 3-8.

Wherein the metal casing comprises a pair of long sides and a pair of short sides which are oppositely disposed, a pair of the short sides are connected between a pair of the long sides, and the first open end is located on one of the long sides The first closed end extends along an extending direction of the short side.

Wherein, the slit width of the micro slit is 0.01 mm to 0.5 mm.

Wherein, the number of the micro slits is 2 to 5.

Wherein, the non-signal shielding material is disposed in the micro slit.

In another aspect, the present invention also provides a mobile terminal comprising an antenna device.

The mobile terminal further includes a front shell assembly, the metal shell is disposed on the front shell assembly to form an accommodating space, the main board is located in the accommodating space, and the main board and the front shell Component ground connection.

The front shell assembly defines a front shell gap, and the front shell gap faces a gap of the main board.

Compared with the prior art, the present invention has the following beneficial effects:

The antenna device and the mobile terminal in the embodiment of the present invention not only facilitate the signal radiation of the radio frequency transceiver circuit on the motherboard but also reduce the metal casing by providing the micro slit tape having the first open end and the first closed end on the metal casing. The non-metal ratio increases the overall appearance of the mobile terminal.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without the creative work are all within the scope of the present invention.

In the description of the embodiments of the present invention, it is to be understood that the orientation or positional relationship indicated by the terms “left side”, “right side”, “upper side”, “lower side”, “long”, “short”, etc. is based on the orientation or position shown in the drawings. The present invention is to be construed as being limited to the invention and is not intended to be construed as a limitation of the invention.

The present invention relates to a mobile terminal, which includes an antenna device, and the mobile terminal can be any device having communication and storage functions, such as a tablet computer, a mobile phone, an e-reader, a remote controller, a personal computer (PC), A smart device with network capabilities such as notebook computers, car devices, Internet TVs, and wearable devices. The mobile terminal includes an antenna device. The antenna device comprises a metal casing and a motherboard provided with a radio frequency transceiver circuit and a matching capacitor, wherein the metal casing is generally used as a back cover of the mobile terminal, and the inside thereof accommodates the battery and the motherboard.

Referring to FIG. 1 to FIG. 3 , a mobile terminal 100 is provided. The mobile terminal 100 includes an antenna device 1 . The antenna device 1 includes a metal casing 11 , a motherboard 12 , a radio frequency transceiver circuit 13 , and a matching capacitor . 14. The metal casing 11 defines a micro-slit strip 111 to form a clearance area, and the RF transceiver circuit 13 is electrically connected to the motherboard 12 through the matching capacitor 14. The radiation signal emitted by the RF transceiver circuit 13 is radiated through the micro-slit strip 111, which is beneficial to the antenna device 1. Signal radiation.

In the present embodiment, referring to FIG. 2, the metal casing 11 includes a pair of long sides and a pair of short sides which are oppositely disposed, and a pair of short sides are connected between a pair of long sides. The pair of long sides includes a first long side L1 and a second long side L2, and the pair of short sides are included in the first short side S1 and the second short side S2.

In the present embodiment, the number of the micro slit tapes 111 is one. The microslit strip 111 has a first open end S3 and a first closed end S4, the first open end S3 is located on the edge of the metal casing 11, and the first closed end S4 is located away from the first open end S3. The position is such that the microslit tape 111 partially separates the metal casing 11. The microslit tape 111 is provided with a plurality of micro slits 111a arranged side by side. It can be understood that the first open end S3 is located on the first long side L1, the first closed end S4 extends along the extending direction of the first short side S1, and is close to the first short side S1, and the plurality of micro slits 111a are along The extending direction of the first long side L1 is arranged side by side, and by providing the micro slit tape 111 in the above-described configuration, the metal ratio of the metal casing 11 is further increased, thereby improving the appearance integrity of the metal casing 11 and the mobile terminal 100. It can be understood that the micro slit 111a is a long rectangular hole. It can be understood that the non-signal shielding material 111b can be disposed in the micro slit 111a. Specifically, the non-signal shielding material 111b is plastic, which further improves the appearance integrity of the metal casing 11 while making the metal casing 11 have better waterproof performance. . Of course, in other embodiments, the number of the microslit strips 111 may also be two, three or more, which are disposed on the metal casing 11 according to actual needs. Of course, in other embodiments, the first open end S3 may also be located on the first short side S1, and the first closed end S4 extends along the direction of the first long side L1. Of course, in other embodiments, the micro slits 111a may also be wavy, lightning, oblong, or the like.

Preferably, the slit width of the micro slit 111a is 0.01 mm to 0.5 mm. In the present embodiment, the slit width of the micro slit 111a is 0.06 mm, so that the micro slit 111a is invisible to the naked eye, and the appearance integrity of the metal casing 11 is further improved.

Preferably, the number of the micro slits 111a is 2 to 5. In the embodiment, the number of the micro slits 111a is three, which is advantageous for the radiation of the motherboard 12.

In this embodiment, referring to FIG. 3, the motherboard 12 is provided with a slot 12a. The slot 12a divides the motherboard portion into an upper portion 12b and a lower portion 12c. The RF transceiver circuit 13 is disposed on the lower portion 12c of the motherboard 12, and the matching capacitor 14 is electrically connected. It is connected between the RF transceiver circuit 13 and the upper portion 12b of the motherboard 12 to form a slot antenna by the excitation slot 12a, and then radiates the radiation signal through the micro slit tape 111 through the RF transceiver circuit 13. Specifically, the motherboard 12 is spaced apart from the metal casing 11 and the motherboard 12 faces the metal casing 11.

It can be understood that the slit 12a faces the microslit strip 111 so that the signal of the radio frequency transceiver circuit 13 can be radiated better through the micro slit strip 111, thereby improving the radiation efficiency of the antenna device 1.

Preferably, the slit 12a has a second open end S7 and a second closed end S8 disposed opposite to each other, the second open end S7 is located on the edge of the motherboard 12, and the second closed end S8 is located at a position away from the second open end S7 of the slit 12a. At the office. The main board 12 is partitioned into an upper portion 12b and a lower portion 12c by a slit 12a. The main board 12 includes a left side S4 and a right side S5 which are oppositely disposed. The second open end S7 is located on the left side S4, and the second closed end S8 is away from the left side. The direction of the left side S4 extends, and the structure of the slit 12a is the same as that of the micro slit tape 111. Referring to FIG. 1, when the motherboard 12 is facing the metal casing 11, since the structure of the slit 12a is the same as that of the microslit belt 111, so that the motherboard 12 faces the metal casing 11, the slit 12a is positive on the metal casing 11. The projection coincides with the microslit strip 111, that is, the slit 12a faces the micro slit strip 111, so that the slit 12a and the matching capacitor 14 form a slot antenna, and the signal of the slot antenna can pass through the RF transceiving circuit 13 preferably from the micro slit tape 111. Radiation out further improves the antenna performance of the antenna device 1 and the mobile terminal 100. Of course, in other embodiments, the size of the slits may be different from the size of the microslit strips. Of course, in other embodiments, the orthographic projection of the slit 12a on the metal casing 11 may partially coincide with the microslit strip 111.

Preferably, the antenna device 1 further includes an impedance matching circuit 15 electrically connected between the RF transceiver circuit 13 and the matching capacitor 14. By providing the impedance matching circuit 15 between the RF transceiver circuit 13 and the matching capacitor 14, the impedance matching circuit 15 can be further adapted to the internal impedance of the matching capacitor 14, so that the signal received or output by the RF transceiver circuit 13 is the maximum power. .

Preferably, the antenna device 1 further includes a switch 16 and a ground point 17 disposed at a lower portion, the switch 16 being electrically connected between the upper portion 12b and the ground point 17 of the lower portion 12c. Wherein, according to actual needs, the switch 16 is disposed at the corresponding position of the slot 12a and the grounding point 17 is disposed on the motherboard 12 to modulate the frequency band on the motherboard 12. When the switch 16 is turned off, the signal excited by the matching capacitor 14 is modulated. The direction along the second open end S7 to the second closed end S8 of the slit 12a is transmitted at the periphery of the slit 12a. At this time, the operating frequency band of the motherboard 12 is a high frequency band; when the switch 16 is closed, the signal is directly grounded through the switch 16. Short-circuited in the length direction of the second closed end S8, at this time, the operating frequency band of the motherboard 12 is a low frequency band. In summary, the frequency band of the motherboard 12 is modulated by disposing the switch 16 and the grounding point 17 on the motherboard 12 to satisfy the movement. The requirements of various components within the terminal 100 for different frequency bands improve the antenna performance of the antenna device 1 and the mobile terminal 100.

The antenna device 1 and the mobile terminal 100 in the embodiment of the present invention are provided with the micro slit tape 111 having the first open end S3 and the first closed end S4 on the metal casing 11, which is beneficial to the signal radiation of the motherboard 12 and is reduced. The non-metal ratio of the metal casing 11 improves the overall appearance of the mobile terminal 100.

Further, the motherboard 12 is grounded to the metal casing 11 and the position 112 of the metal casing 11 connected to the ground is disposed around the microslit belt 111.

In the present embodiment, the motherboard 12 is grounded to the metal casing 11, and the metal casing 11 is formed into a radiating portion of the antenna device 1 by forming the motherboard 12, and it can be understood that the position 112 of the metal casing 11 connected to the ground is surrounded by The microslit tape 111 is evenly disposed such that the portion of the metal casing 11 that surrounds the microslit belt 111 as a radiation body is more uniform, further improving the antenna performance of the antenna device 1. It can be understood that the number of positions where the metal casing 11 is grounded is 3-8, which can further ensure the antenna performance after the metal casing 11 becomes a radiator. Wherein, the metal casing 11 is grounded at a position 112 of three, which is uniformly disposed around the microslit belt 111, so that the metal casing 11 can form a radiator with better radiation performance.

Further, referring to FIG. 1 , the mobile terminal 100 further includes a front casing assembly 2 . The metal casing 11 is disposed on the front casing assembly 2 to form an accommodation space D. The motherboard 12 is located in the accommodation space D, and the motherboard 12 and the front casing Component 2 is grounded.

In this embodiment, the front casing assembly 2 includes a front casing and a screen assembly (not shown). The screen assembly is disposed on the front casing, and the portion of the screen assembly that is blocked by the front casing is a non-display area, and the screen assembly is not blocked by the front casing. The part is a display area, which is generally capable of display and touch operations. The non-display surface of the front case assembly 2 is grounded to the motherboard 12 such that the front case assembly provides a zero potential for the motherboard 12, that is, the front case assembly 2 is a ground for providing a zero potential to the ground point of the motherboard 12, and the motherboard 12 The metal casing 11 becomes the other radiator of the antenna device 1 with respect to the metal casing 11, and the front casing assembly 2 also forms the other radiator of the antenna device 1 as a whole, further The radiation performance of the antenna device 1 is improved.

It can be understood that the front casing assembly 2 opens the front casing slit 2a, and the front casing slit 2a faces the slit 12a to ensure that the signal excited by the slit 12a can be radiated better through the front casing slit 2a. Specifically, the position of the ground connection of the front case assembly 2 is uniformly disposed around the front case slot 2a, and the position of the ground connection of the front case assembly 2 corresponds to the position 112 of the metal case 11 being grounded. The orthographic projection of the front case slit 2a on the main board 12 coincides or partially overlaps with the slit of the main board 12, so that the front case assembly 2 forms another radiating portion of the antenna device 1, so that the signal of the antenna device 1 can be transmitted from the front case assembly 2 Radiation is emitted to further improve the radiation performance of the antenna device 1.

The embodiments of the present invention have been described in detail above, and the principles and implementations of the present invention are described in detail herein. The description of the above embodiments is only for helping to understand the method of the present invention and its core ideas; The present invention is not limited by the scope of the present invention, and the details of the present invention are not limited by the scope of the present invention.

100‧‧‧Mobile terminal

111‧‧‧Microslit tape

D‧‧‧ accommodating space

1‧‧‧Antenna device

2‧‧‧Front shell assembly

2a‧‧‧ front shell gap

11‧‧‧Metal casing

12‧‧‧ motherboard

12a‧‧‧ gap

13‧‧‧RF Transceiver Circuit

S1‧‧‧ first short side

S2‧‧‧ second short side

S3‧‧‧ first open end

S4‧‧‧ first closed end

S5‧‧‧ right side

S7‧‧‧ second open end

S8‧‧‧ second closed end

L1‧‧‧First long side

L2‧‧‧ second long side

112‧‧‧ Location of ground connection

111a‧‧‧Micro-seam

111b‧‧‧Non-signal shielding material

12b‧‧‧ upper

12c‧‧‧ lower

14‧‧‧Matching capacitor

15‧‧‧ impedance matching circuit

16‧‧‧ switch

17‧‧‧ Grounding point

In order to more clearly illustrate the technical solutions of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, For those having ordinary knowledge, other drawings can be obtained from these drawings without paying creative labor. 1 is a schematic structural view of a mobile terminal according to an embodiment of the present invention; FIG. 2 is a schematic structural view of the metal casing of FIG. 1; and FIG. 3 is a schematic structural view of a motherboard provided with various circuits of FIG.

Claims (18)

An antenna device includes a metal casing, a motherboard, a radio frequency transceiver circuit, and a matching capacitor. The metal casing defines a micro slit tape, and the micro slit tape has a first open end opposite to each other. And a first closed end, the first open end is located on an edge of the metal casing, and the first closed end is located at a position of the micro slit tape away from the first open end, so that the micro slit The belt partitions the metal casing portion, the microslit belt is provided with a plurality of micro slits arranged side by side; the main board is grounded to the metal casing, and the position of the metal casing ground connection surrounds the micro a slit strip, the motherboard is provided with a slit, the slit partitioning the motherboard portion into an upper portion and a lower portion, the slit is opposite to the micro slit strip, and the radio frequency transceiver circuit is disposed on the motherboard In the lower portion, the matching capacitor is electrically connected between the radio frequency transceiver circuit and the upper portion of the motherboard, and the radiation signal of the radio frequency transceiver circuit is radiated through the micro slit tape. The antenna device of claim 1, wherein the slit has a second open end and a second closed end disposed opposite to each other, the second open end being located on an edge of the motherboard The second closed end is located at a position where the slit is away from the second open end. The antenna device of claim 1, wherein the antenna device further comprises an impedance matching circuit electrically connected between the radio frequency transceiver circuit and the matching capacitor. The antenna device according to claim 1, wherein the antenna device further includes a switch and a grounding point disposed at the lower portion, the switch being electrically connected to the grounding point of the upper portion and the lower portion between. The antenna device according to claim 1, wherein the number of locations where the metal casing is grounded is 3 to 8. The antenna device according to claim 1, wherein the metal casing comprises a pair of long sides and a pair of short sides which are oppositely disposed, and a pair of the short sides are connected between a pair of the long sides, The first open end is located on one of the long sides, and the first closed end extends along an extending direction of the short side. The antenna device according to claim 1, wherein the metal casing comprises a pair of long sides and a pair of short sides which are oppositely disposed, and a pair of the short sides are connected between a pair of the long sides, The first open end is located on one of the long sides, and the first closed end extends along an extending direction of the short side. The antenna device according to claim 2, wherein the metal casing comprises a pair of long sides and a pair of short sides which are oppositely disposed, and a pair of the short sides are connected between a pair of the long sides, The first open end is located on one of the long sides, and the first closed end extends along an extending direction of the short side. The antenna device according to claim 3, wherein the metal casing comprises a pair of long sides and a pair of short sides which are oppositely disposed, and a pair of the short sides are connected between the pair of the long sides, The first open end is located on one of the long sides, and the first closed end extends along an extending direction of the short side. The antenna device according to claim 4, wherein the metal casing comprises a pair of long sides and a pair of short sides which are oppositely disposed, and a pair of the short sides are connected between the pair of the long sides, The first open end is located on one of the long sides, and the first closed end extends along an extending direction of the short side. The antenna device according to claim 1, wherein the metal casing comprises a pair of long sides and a pair of short sides which are oppositely disposed, and a pair of the short sides are connected between a pair of the long sides, The first open end is located on one of the long sides, and the first closed end extends along an extending direction of the short side. The antenna device according to claim 5, wherein the metal casing comprises a pair of long sides and a pair of short sides which are oppositely disposed, and a pair of the short sides are connected between the pair of the long sides, The first open end is located on one of the long sides, and the first closed end extends along an extending direction of the short side. The antenna device according to any one of claims 1 to 12, wherein the slit width of the micro slit is 0.01 mm to 0.5 mm. The antenna device according to any one of claims 1 to 12, wherein the number of the micro slits is 2 to 5. The antenna device according to any one of claims 1 to 12, wherein a non-signal shielding material is disposed in the micro slit. A mobile terminal, comprising the antenna device according to any one of claims 1 to 15. The mobile terminal of claim 16, wherein the mobile terminal further includes a front casing assembly, the metal casing is disposed on the front casing assembly to form an accommodation space, and the motherboard is located at the The space is accommodated, and the motherboard is grounded to the front case assembly. The mobile terminal of claim 17, wherein the front case assembly defines a front case slot, and the front case slot faces a gap of the motherboard.