WO2016173485A1

WO2016173485A1 - Slot antenna and mobile terminal

Info

Publication number: WO2016173485A1
Application number: PCT/CN2016/080210
Authority: WO
Inventors: 陈玉稳
Original assignee: 维沃移动通信有限公司
Priority date: 2015-04-27
Filing date: 2016-04-26
Publication date: 2016-11-03
Also published as: CN105762519B; CN105762519A

Abstract

Embodiments of the present disclosure provide a slot antenna and a mobile terminal. The slot antenna comprises a metal block, a metal frame, at least two grounding plates, and at least one group of antenna assemblies. The antenna assemblies comprise an antenna feed, an antenna unit, and at least two groups of matching networks. The metal frame is disposed along the periphery of the metal block, and forms a gap with the metal block. The at least two grounding plates are disposed in the gap to allow the metal frame and the metal block to be grounded; the at least two grounding plates are respectively disposed on a first side edge and a second side edge of the metal frame, and the first side edge is opposite to the second side edge. The antenna assemblies are disposed in the gap. The antenna feed is disposed between the metal block and the antenna unit. The matching networks are arranged between the antenna unit and the metal frame.

Description

Slot antenna and mobile terminal

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 201510210078.0, filed on Jan. 27, 2015, the entire content of

Technical field

The present disclosure relates to the field of antenna technologies, and in particular, to a slot antenna and a mobile terminal.

Background technique

With the user's pursuit of the metal texture of the mobile terminal, the mobile terminal with the metal middle frame poses a great challenge to the antenna in terms of bandwidth and design complexity, especially in the case where the metal middle frame cannot be broken.

At present, the solution for the metal frame without breakpoints adopts the slot antenna and its evolution, but this is only a general principle. The specific design implementation still encounters a large design complexity, and it is difficult to simultaneously consider the various frequency bands. The problem of large matching loss and insufficient bandwidth.

In the related art solution, in order to balance the respective frequency bands, a topology of one feed point and one ground point can be used to generate a relatively good low frequency resonance, and in the high frequency band, multiple ground points are used, and the grounding position and the grounding of the low frequency topology are grounded. The location is different. The mobile terminal adopting this scheme adopts an extremely complicated grounding matching network. Although the performance of low frequency and high frequency is taken into consideration, there are such complex matching, large matching loss, mutual interference, and reduced antenna radiation efficiency. Shortcomings.

Therefore, a technical problem that needs to be urgently solved at present is how to simplify the structure of the slot antenna while taking into consideration the high and low frequency performance.

Summary of the invention

The technical problem to be solved by the embodiments of the present disclosure is to provide a slot antenna and a mobile terminal, which can simplify the structure of the slot antenna while taking into consideration high and low frequency performance.

In order to solve the above problems, the present disclosure discloses a slot antenna including a metal block, a metal frame, at least two ground plates, and at least one set of antenna components, the antenna assembly including an antenna feed, Antenna unit, and at least two sets of matching networks,

The metal frame is disposed along an outer circumference of the metal block, and forms a gap with the metal block;

The at least two grounding strips are disposed in the gap to ground the metal frame and the metal block, and the at least two grounding strips are respectively disposed on the first side and the second side of the metal frame On the side, the first side edge is opposite to the second side edge;

The antenna assembly is disposed in the slot, wherein the antenna feed is disposed between the metal block and the antenna unit, and the matching network is disposed between the antenna unit and the metal frame.

Optionally, among the at least two grounding strips, a gap length between two adjacent grounding strips is adapted to the transverse mode and the longitudinal mode of the low frequency resonance.

Optionally, the distance from the grounding strip to the third side is 50 mm to 100 mm, wherein the third side is located between the first side and the second side of the metal frame.

Optionally, the at least two sets of matching networks include a first matching network and a second matching network, wherein the first matching network exhibits different equivalent values on two resonant frequencies of the low frequency.

Optionally, the inductive component in the first matching network and the second matching network is a thin line integrated on the antenna unit.

Optionally, the first matching network and the capacitive element in the second matching network are slot-coupled.

Optionally, the second matching network is a slot coupling between the antenna unit and the third side, wherein the third side is located on the first side of the metal frame and the Between the second sides.

Optionally, the second matching network is connected between the 1/4 to 1/2 portions of the third side.

Optionally, the first matching network is connected to a connection between the first side and the third side.

Optionally, a third matching network is further connected between the antenna unit and the metal block.

Optionally, a fourth matching network is further connected between the metal frame and the metal block.

The embodiment of the present disclosure also discloses a mobile terminal in which the above slot antenna is disposed.

Compared to the related art, the embodiments of the present disclosure include the following advantages:

The slot antenna in the embodiment of the present disclosure has a simple structure, and is directly grounded by providing a grounding piece on both sides, thereby avoiding the signal passing through the grounding point and generating the upper antenna (such as a GPS antenna, a WIFI antenna, and a diversity antenna). Interference, and without complex ground matching, the matching loss is small, and the antenna assembly takes into account the low-frequency and high-frequency resonant modes through at least two sets of matching networks.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings to be used in the embodiments or the related art description will be briefly described below. Obviously, the drawings in the following description are only Some of the embodiments described in the application can be used to obtain other drawings based on these drawings without departing from the prior art. The following figures are not intended to be scaled to scale in actual dimensions, with emphasis on the subject matter of the present application.

1 is a schematic structural view of a slot antenna in an embodiment of the present disclosure;

2 is a schematic structural diagram of another slot antenna in the embodiment of the present disclosure;

3 is an equivalent value curve of a first matching network in different frequency bands in an embodiment of the present disclosure;

4 is a circuit diagram of a first matching network in an embodiment of the present disclosure;

5 is a circuit diagram of a second matching network in an embodiment of the present disclosure;

6 is a diagram showing a return loss of a slot antenna in an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of another slot antenna in the embodiment of the present disclosure.

detailed description

The technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. It is apparent that the described embodiments are part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure are within the scope of the disclosure.

Unless otherwise defined, technical terms or scientific terms used herein shall be taken to mean the ordinary meaning of the ordinary skill in the art to which the invention pertains. The words "first", "second" and similar terms used in the specification and claims of the present disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "one" or "one" The like words do not mean a quantity limitation, but rather indicate that there is at least one. The words "connected" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to indicate the relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship is also changed accordingly.

The present disclosure is described in detail in conjunction with the accompanying drawings, in which, in the detailed description of the embodiments of the present disclosure, the cross-section of the structure of the device will not be partially enlarged, and the schematic is only an example, which should not be limited herein. The scope of this disclosure is protected. In addition, the actual three-dimensional dimensions of length, width and depth should be included in the actual production.

The technical solutions of the present disclosure will be described below with reference to the accompanying drawings and embodiments.

In some embodiments of the present disclosure, as shown in FIG. 1, the slot antenna includes a metal block 11, a metal frame 12, a ground plate 13, and an antenna assembly 14.

The metal block 11 may be a PCB or a screen metal bracket or a metal battery cover or the like. The metal frame 12 is a continuous annular structure without a break point. Of course, the annular surface may be provided with a notch for mounting a card or inserting a connecting wire, which does not affect the continuity of the metal frame 12. The metal frame 12 is disposed around the outer periphery of the metal block 11 and forms a slit 111 between the metal block 11. The slit 111 may be filled with a non-conductive medium such as air or glass.

The grounding piece 13 is disposed in the slit 111 to ground the metal frame 12 and the metal block 11. Specifically, the grounding strips 13 are fixedly connected to the metal frame 12 and the metal frame 11, respectively. The grounding strips 13 are at least two and are respectively disposed on two opposite sides of the metal frame 12.

As shown in FIG. 1, two grounding lugs 13 are disposed on the opposite first side 121 and second side 122 of the metal frame 12, respectively. The two grounding lugs 13 divide the slit 111 into two U-shaped slits. One of the U-shaped slits can be used to set the above antenna assembly, and the other U-shaped slit can be integrated with other antennas. For example, the antenna assembly 14 is disposed in the lower U-shaped slot in FIG. 1, and the upper U-shaped slot is integrated with other antennas, such as a GPS antenna, a WIFI antenna, and a diversity antenna.

In other embodiments, the grounding strip 13 may also have multiple. For example, a third grounding strip may be disposed in the U-shaped slit of FIG. 1, but the grounding strip needs to be connected in series with a high-resistance low-pass filter. The effect of the third grounding piece on the low frequency is reduced, and the high frequency performance is improved by the influence of the third grounding piece. Similarly, it is also possible to continue to add a grounding lug. The length of the gap between two adjacent grounding strips can be set to fit the transverse mode and the longitudinal mode of the low frequency resonance to facilitate low frequency double harmonics. Vibration.

The antenna assembly 14 is disposed in the slot 111. If the grounding plate 13 is disposed as in Fig. 1, the antenna assembly 14 is disposed at the bottom of the lower U-shaped slot. The antenna assembly 14 can have multiple sets.

The antenna assembly 14 is coupled between the metal block 11 and the metal frame 12, the antenna assembly 14 including an antenna feed, an antenna unit, and a matching network. The antenna feed is disposed between the metal block 11 and the antenna unit, and the matching network is disposed between the antenna unit and the metal frame 12. Among them, there are at least two groups of matching networks. The antenna assembly 14 enables the slot antenna to simultaneously satisfy low frequency requirements such as 824-960 MHz and high frequencies such as 1710-2690 MHz.

In some embodiments of the present disclosure, as shown in FIG. 2, the slot antenna includes a metal block 21, a metal frame 22, two grounding

plates

23, 24, and an antenna assembly, wherein the antenna assembly includes an antenna feed 25 and an antenna unit 26 And a matching network having two groups, a first matching network 27 and a second matching network 28, respectively. In other embodiments, more matching networks may be added between the antenna unit 26 and the metal frame 22 for better antenna performance, and more matching networks may be added between the antenna unit 26 and the metal block 21, It only increases the complexity of the slot antenna.

The metal block 21 and the metal frame 22 are similar to the metal block 11 and the metal frame 12 in the foregoing embodiments, respectively, and are not described herein again. The metal frame 22 is disposed around the outer periphery of the metal block 21, and a gap 211 is formed between the metal block 21 and the metal block 21. The metal frame 22 is rectangular and has a first side 221, a second side 222, and a third side 223. The first side 221 is opposite to the second side 222 , and the third side 223 is located between the first side 221 and the second side 222 , and specifically may be the bottom side of the metal frame 22 .

The grounding lugs 23, 24 are disposed in the slit 211 to ground the metal block 21 and the metal frame 22. The grounding strip 23 is disposed on the first side 221, and the grounding strip 24 is disposed on the second side 222. The two

grounding strips

23, 24 divide the slit 211 into two U-shaped slits, and the gap between the two grounding

strips

23, 24. The length is just right for the low frequency double resonance mode, including the transverse mode and the longitudinal mode. The distance between the grounding strips 23 and 24 from the third side 223 may be about 50-100 mm. Specifically, the distance between the grounding strip 23 and the third side 223 may be 90 mm, and the distance between the grounding strip 24 and the third side 223. It is 100mm. of course, The distance can be adjusted according to factors such as the size of the machine, the width of the slit, the medium filled in the gap, and the like.

The antenna assembly is disposed in the slot 211, wherein the antenna feed 25 is disposed between the metal block 21 and the antenna unit 26, and the first matching network 27 and the second matching network 28 are both disposed between the antenna unit 26 and the metal frame 22.

In this embodiment, by designing a low-frequency and high-frequency resonant mode that can be generated without an antenna unit, a suitable antenna unit and a matching network can be designed, and several modes obtained by the simulation can be simultaneously excited, so that the slot antenna simultaneously satisfies the low frequency. Such as 824-960MHz, high frequency such as 1710-2690MHz demand.

Taking a mobile terminal with a metal frame with a length, width and height of 140*70*7mm as an example, the low frequency and high frequency resonance modes generated by the simulation can be known:

The 827 MHz mode is lateral excitation, and a suitable first matching network 27 can be designed such that the incoming energy of the antenna feed 25 can reach the metal frame 22 through the first matching network 27 at 827 MHz, while the second matching network 28 is compared at 827 MHz. By blocking the passage of energy, a resonant mode of 827 MHz can be excited.

The 957 MHz mode is a longitudinal excitation, and a suitable first matching network 27 is designed such that the incoming energy of the antenna feed 25 can be more evenly distributed to the first matching network 27 and the second matching network 28 at 957 MHz, thereby exciting the metal frame. On the 22nd, the resonant mode of 957MHz can be excited.

It can be seen that when the first matching network 27 exhibits different equivalent values at the two resonant frequencies of the low frequency, the low frequency of the slot antenna exhibits double resonance, thereby achieving the purpose of expanding the bandwidth.

As shown in FIG. 3, the equivalent value of the first matching network 27 in different frequency bands, the first matching network 27 exhibits an equivalent value of a large inductance and a small capacitance at the first resonant frequency of the low frequency band. The equivalent value of the second resonant frequency of the low frequency band is a small inductance and a large capacitance.

By the same token, the various modes of the high frequency can also be simultaneously excited by the appropriate first matching network 27 and the second matching network 28.

Through the resonant mode of the 1710-2690MHz high frequency band, it can be found that the third side 223 of the metal frame 22, that is, the 1/4 to 1/2 portion of the bottom side is always the part with the stronger electric field, so the second optimization is performed in this interval. The position and matching value of the matching network 28 is such that the second matching network 28 is connected between the 1/4 and 1/2 portions of the third side 223 to achieve better high frequency performance.

Specifically, the inductive components in the first matching network 27 and the second matching network 28 may be integrated. On the thin lines on the antenna unit 26, the capacitive elements may be slot coupled.

The first matching network 27 may be composed of an inductive element and a capacitive element as shown in FIG. 4, and the first matching network 27 is connected to the junction of the first side 221 and the third side 223, as shown in FIG. The second matching network 28, as shown in FIG. 5, can be directly simplified to the slot coupling between the antenna unit 26 and the third side 223, and as shown in FIG. 2, the second matching network 28 is connected to the third side 223. Between 1/4 and 1/2 parts.

The antenna feed 25 can be moved right and left to achieve better results.

As shown in FIG. 6, the return loss diagram of the slot antenna in the above example can significantly generate double resonance at low frequencies, and the high frequency bandwidth is also good.

In another embodiment of the present disclosure, as shown in FIG. 7, a third matching network 71 may be connected between the antenna unit 26 and the metal block 21, and the metal frame 22 and the metal block 21 may be connected. There is a fourth matching network 72, wherein the third matching network 71 can adjust the high frequency bandwidth better, and the fourth matching network 72 can make the antenna unit 26 more flexible.

The slot antenna in the embodiment of the present disclosure has a simple structure, and is directly grounded by providing two grounding plates on both sides, thereby avoiding not only the signal passing through the grounding point but also the upper antenna (such as a GPS antenna, a WIFI antenna, and a diversity antenna). The interference occurs, and the antenna component realizes low-frequency double resonance through two sets of matching networks, expands the bandwidth, and realizes the high-frequency resonance mode, which reduces the absorption of signals by the human hand.

In other embodiments, the U-shaped portion of the metal frame corresponding to the other integrated antennas may have a break point to make other antennas perform better, and the U-shaped portion corresponding to the antenna assembly is continuous without breakpoints; or The metal frame may not be a complete ring frame, and may be a semi-annular frame. The metal frame is continuous without break points. The metal frame is disposed along the outer periphery of the metal block and forms a U-shaped slit with the metal frame. The U-shaped slit An antenna assembly is provided inside. That is, the metal frame is only continuous without a break point near the set position of the antenna assembly.

In the above embodiment, the shape of the antenna unit can be flexible, such as a strip shape, a U shape, an S shape, and the like. Devices such as USB or speakers, microphones, etc. can also be placed in the lower end slot area of the mobile terminal.

The embodiment of the present disclosure further discloses a mobile terminal, which includes the slot antenna in the above embodiment. For the specific structure of the slot antenna, refer to the description of the foregoing embodiment, and details are not described herein again.

In the above embodiments, the shapes and structures of the respective members are merely examples and are not limited. In addition, the above components may be replaced by other components having the same function, and combined to form more technical solutions, and the technical solutions formed by these replacements are all within the scope of the technical solutions of the present disclosure.

The above description is only a preferred embodiment of the present disclosure, and is not intended to limit the present disclosure in any way.

Although the present disclosure has been disclosed above in the preferred embodiments, it is not intended to limit the present disclosure. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present disclosure, or modify to equivalent changes, etc., without departing from the scope of the technical solutions of the present disclosure. Effective embodiment. Therefore, any simple modifications, equivalent changes, and modifications of the above embodiments may be made without departing from the spirit and scope of the present disclosure.

Claims

A slot antenna includes a metal block, a metal frame, at least two ground plates, and at least one set of antenna components, the antenna assembly including an antenna feed, an antenna unit, and at least two sets of matching networks,

The metal frame is disposed along an outer circumference of the metal block, and forms a gap with the metal block;

The at least two grounding strips are disposed in the gap to ground the metal frame and the metal block, and the at least two grounding strips are respectively disposed on the first side and the second side of the metal frame On the side, the first side edge is opposite to the second side edge;

The antenna assembly is disposed in the slot, wherein the antenna feed is disposed between the metal block and the antenna unit, and the matching network is disposed between the antenna unit and the metal frame.
The slot antenna according to claim 1, wherein a gap length between adjacent ones of the at least two grounding sheets is adapted to a transverse mode and a longitudinal mode of the low frequency resonance.
The slot antenna according to claim 2, wherein the grounding strip has a distance from the ground to the third side of 50 mm to 100 mm, wherein the third side is located at the first side of the metal frame Between the second side.
The slot antenna of claim 1, wherein the at least two sets of matching networks comprise a first matching network and a second matching network, wherein the first matching network presents different values at two resonant frequencies of low frequencies Equivalent value.
The slot antenna of claim 4, wherein the inductive component in the first matching network and the second matching network is a thin wire integrated on the antenna unit.
The slot antenna of claim 5 wherein the first matching network and the capacitive elements in the second matching network are slot coupled.
The slot antenna according to claim 4, wherein said second matching network is a slot coupling between said antenna unit and said third side, wherein said third side is located at said metal frame Between the first side and the second side.
The slot antenna of claim 7 wherein said second matching network is coupled between 1/4 and 1/2 portions of said third side.
The slot antenna of claim 8 wherein said first matching network is coupled to said The junction of the first side and the third side is described.
The slot antenna according to any one of claims 1 to 9, wherein a third matching network is further connected between the antenna unit and the metal block.
The slot antenna according to any one of claims 1 to 9, wherein a fourth matching network is further connected between the metal frame and the metal block.
A mobile terminal, wherein the slot antenna according to any one of claims 1 to 11 is provided in the mobile terminal.