CN104577300A - Multi-branch mobile terminal antenna and mobile terminal thereof - Google Patents

Abstract

The present invention proposes a multi-branch mobile terminal antenna, including a main antenna body and a parasitic antenna body, characterized in that: the parasitic antenna body includes two or more parasitic branches. The invention introduces a double-branch or multi-branch parasitic antenna body, forms multiple resonance points through strong and weak coupling, and multi-branch mode, and can effectively expand the bandwidth. At the same time, it is also proposed that the mobile terminal using the above-mentioned multi-branch mobile terminal antenna has good bandwidth expansion performance and can adapt to the application requirements of multiple frequency bands.

Description

A multi-branch mobile terminal antenna and mobile terminal thereof

technical field

The invention relates to a multi-branch mobile terminal antenna and its mobile terminal

Background technique

The miniaturization and multi-frequency of mobile terminals pose severe challenges to antenna design. For example, ordinary multi-band antennas have the disadvantage that the high-frequency and low-frequency branches restrict each other in terms of antenna performance. In design, the low-frequency branch is generally used to surround the high-frequency branch to form a "G"-shaped structure. However, the above-mentioned "G"-shaped structure has obvious disadvantages: on the one hand, it restricts the low-frequency bandwidth, and on the other hand, it requires a large headroom area. As the thickness of the mobile terminal becomes smaller, the height of the top surface of the antenna bracket becomes lower and lower, and the transmitting and receiving of the antenna can only use the end surface of the clearance. However, due to the compact design inside the mobile terminal, the usable clearance end face of the antenna is small or long-striped. If the above-mentioned "G"-shaped antenna is used, the optimal low-frequency bandwidth cannot be achieved.

Contents of the invention

The first object of the present invention is to provide a communication antenna with simple structure and excellent electrical performance for the problem that the performance of the high-frequency and low-frequency branches of the communication antenna is mutually restricted.

The technical scheme adopted is as follows:

A multi-branch mobile terminal antenna includes a main antenna body and a parasitic antenna body, characterized in that the parasitic antenna body includes two or more parasitic branches.

In the above scheme, the high-frequency branch of the main radiator corresponds to a high-frequency resonance point, and the parasitic antenna body can generate two or more high-frequency resonance points through coupling, which greatly expands the high-frequency bandwidth and solves the high-frequency problem of mobile terminals. The frequency band bandwidth is generally narrow.

As an improvement of the above scheme, the present invention also includes the following technical schemes:

Further, the parasitic antenna body includes a first parasitic branch close to the main antenna body, and a second parasitic branch far away from the main antenna body. The first parasitic branch and the second parasitic branch correspondingly generate a first resonance point and a second resonance point, and independent resonance points further reduce the influence between frequency bands.

Further, the main antenna body is provided with a high-frequency branch, and the first parasitic branch is close to the high-frequency branch and forms a coupling with it.

Further, the first parasitic branch extends along the extending direction of the high frequency branch. The above-mentioned solution can ensure that the overall antenna is flat and elongated, unlike the traditional "G"-shaped antenna, and can better utilize the clearance area on the terminal.

Further, a capacitor or a capacitive element is connected between the high frequency branch of the main antenna body and the first parasitic branch.

Further, a semi-closed gap is formed between the high-frequency branch of the main antenna body and the first parasitic branch, and a coupling piece is arranged above or below the gap.

In the above solution, the coupling strength between the high-frequency radiation branch and the first parasitic branch is enhanced by adding a capacitor, a capacitive element or a coupling plate, so as to meet the requirement of radiation. At the same time, it also makes the debugging of the antenna signal more convenient and flexible.

Further, the parasitic antenna body further includes a third parasitic branch, the third parasitic branch is generated at the connecting portion of the first parasitic branch and the second parasitic branch, and the third parasitic branch is close to the first parasitic branch and extends along it direction extension.

According to the actual application and frequency band requirements, the high-frequency bandwidth can be expanded by adding parasitic antenna branches to increase the corresponding high-frequency resonance points. Moreover, the influence of the newly added frequency band and other frequency bands can also be minimized.

In summary, the innovation of the present invention is:

1. Introduce a double-branch or multi-branch parasitic antenna body, and form multiple resonance points through strong and weak coupling and different branches, which can effectively expand the bandwidth. At the same time, except for the high-frequency resonance point of the main radiator, the rest of the high-frequency resonance points are generated by the parasitic antenna body, which further reduces the interference between high and low frequency band signals. Require.

2. The design of independent parasitic antenna body increases the independence between each resonance point, makes the antenna have strong anti-interference, and is convenient for independent debugging of each frequency band.

3. At the same time, reasonably setting the size of the gap between the parasitic antenna body and the antenna body and adding coupling elements can effectively adjust the correlation degree of the resonance point, thereby optimizing and improving its joint bandwidth.

The second object of the present invention is to propose a mobile terminal using the above-mentioned multi-branch mobile terminal antenna. The high-frequency branch and the first parasitic branch are located in the projection area of the clear end surface on the main board of the terminal, the low-frequency branch extends along the inner wall of the terminal frame, and the second parasitic branch extends along the inner wall of the terminal frame.

The above solution rationally utilizes the clear end surface and the narrow top surface of the terminal, which satisfies the requirement of radiation in the part with large clearance and flexibly suits the appearance design of the terminal. The antenna avoids the "G"-shaped structure, and makes more reasonable use of the area of the clear end surface of the terminal, fully adapting to the trend that the top surface of the mobile terminal is becoming thinner and thinner.

Further, the third parasitic branch is located in the projection area of the clear end face on the main board of the terminal.

The multi-resonance point design of the above solution enables the mobile terminal to have good bandwidth expansion performance, and can adapt to the multi-band application requirements of the terminal.

Description of drawings

FIG. 1 is a schematic diagram of the structure of an antenna radiator.

FIG. 2 is a second schematic diagram of the structure of the antenna radiator.

Fig. 3 is a schematic structural diagram of Embodiment 1.

FIG. 4 is a graph of the standing wave ratio of the antenna in the first embodiment.

Fig. 5 is a schematic structural diagram of Embodiment 2.

Fig. 6 is a schematic structural diagram of Embodiment 3.

Detailed ways

The technical scheme of the present invention is described as follows in conjunction with accompanying drawings 1 to 6:

As shown in Figure 1, a multi-branch mobile terminal antenna includes a main antenna body with a high-frequency branch 1 and a low-frequency branch 2, the high-frequency branch 1 and the low-frequency branch 2 extend in the same direction, and a gap is formed between them 6-2; the main antenna body also includes a feed terminal 9 connected to the signal source of the terminal main board, a first ground terminal 8-1 connected to the signal ground of the terminal main board, and the feed terminal 9 is connected to the first ground terminal 8-1. A gap 6-1 is formed between a ground terminal 8-1; and a parasitic antenna body with two or more branches, the parasitic antenna body includes a second ground terminal 8- connected to the signal ground of the terminal board 2. Each branch on the parasitic antenna body forms a coupling with the high-frequency radiation branch 1 respectively.

The first ground terminal 8-1 may also be omitted in the case of a large antenna clearance.

In the above scheme, the high-frequency branch 1 of the main radiator corresponds to a high-frequency resonance point, and the parasitic antenna body can generate two or more high-frequency resonance points through coupling, which greatly expands the high-frequency bandwidth and solves the problem of mobile terminals. The high-band bandwidth is generally narrow.

As an improvement on the above scheme:

Further, the parasitic antenna body includes a first parasitic branch 3 close to the high frequency branch 1 of the main antenna body, and a second parasitic branch 4 far away from the high frequency branch of the main antenna body, the first parasitic branch The branch 3 extends along the extending direction of the high frequency branch 1 .

The first parasitic branch 3 is an internal parasitic high-frequency radiator, which extends close to the high-frequency radiation branch 1 and whose length can be adjusted according to actual conditions. A strong coupling is formed between the first parasitic branch 3 and the high frequency branch 1, and the coupling strength can be adjusted by the width of the third slit 6-3. The second parasitic branch 4 is an external parasitic high-frequency radiator, and a weak coupling is formed between the second parasitic branch 4 and the high-frequency branch 1 . Since the first parasitic branch 3 and the second parasitic branch 4 are located far away from the low frequency radiation branch 2, the influence between high and low frequency bands is further reduced.

Further, a capacitance or a capacitive element may be connected between the high frequency branch 1 and the first parasitic branch 3 .

Further, a semi-closed gap 6-3 is formed between the high-frequency branch 1 and the first parasitic branch 3, and there may be a coupling piece above or below the gap, and the coupling piece is generally a metal piece.

In the above solution, the coupling strength between the high-frequency radiation branch and the first parasitic branch is enhanced by adding a capacitor, a capacitive element or a coupling plate, so as to meet the requirement of radiation. At the same time, it also makes the debugging of the antenna signal more convenient and flexible.

As shown in Figure 2, the parasitic antenna body also includes a third parasitic branch 5, which is formed at the connecting portion of the first parasitic branch 3 and the second parasitic branch 4, which is close to and along the The first parasitic branch 3 extends in the extending direction and forms a semi-closed gap 6-4.

According to the actual application and frequency band requirements, the high-frequency bandwidth can be expanded by adding parasitic antenna branches to increase the corresponding high-frequency resonance points. Moreover, the impact of the newly added high-frequency band on the low-frequency band can also be minimized.

As a deduction of the above solution, the high-frequency branch can be omitted on the main antenna body, the first parasitic branch is directly coupled with the low-frequency branch of the main antenna body, and the overall antenna is flat and long.

As shown in Fig. 3, a specific embodiment of the present invention one:

A mobile terminal using the above-mentioned multi-branch mobile terminal antenna, the mobile terminal includes a narrow frame. When the multi-branch mobile terminal antenna is installed, its flat part 7, first ground terminal 8-1, second ground terminal 8-2 and feed terminal 9 are bent, and after bending, the high-frequency radiation branch 1 and The first parasitic branch 3 is located in the projection area of the clear end surface on the terminal main board 10, the low-frequency radiation branch 2 extends along the top surface of the inner wall of the narrow frame, and the second parasitic branch extends along the top surface of the inner wall of the narrow frame.

The above solution rationally utilizes the clear end surface and the narrow top surface of the terminal, which not only satisfies the required flow of radiation, but also flexibly fits the appearance design of the terminal. The antenna avoids the "G"-shaped structure, and makes more reasonable use of the area of the clear end surface of the terminal, fully adapting to the trend that the top surface of the mobile terminal is becoming thinner and thinner.

As shown in Figure 4, the antenna standing wave ratio curve diagram of Embodiment 1, the first resonance point A generated by the high-frequency branch 1, the second resonance point B generated by the first parasitic branch 3, and the second resonance point B generated by the second parasitic branch 4 The third resonance point C. It can be seen from the graph that the high-frequency branch 1 and each parasitic branch correspond to a resonance point, so that the mobile terminal has good bandwidth expansion performance and can adapt to the multi-band application requirements of the terminal.

In conjunction with Fig. 1 and Fig. 5, a second specific embodiment of the present invention is described:

The high-frequency branch 1 and the first parasitic branch 3 are located in the projection of the clear surface on the terminal main board 10, the low-frequency radiation branch 2 is a single line extending along the top surface of the narrow frame; the second parasitic branch 4 A single trace that runs along the top surface of the narrow bezel. In the gap 6-3, a capacitance or a capacitive element 11 is connected between the high-frequency radiation branch 1 and the first parasitic branch 3 to enhance coupling.

The high-frequency radiation branch 1 is a main high-frequency radiator, correspondingly generating a first resonance point.

The first parasitic branch 3 is an internal parasitic high-frequency radiator, which extends close to the first branch 1 and can be adjusted in length according to actual debugging requirements, correspondingly generating a second resonance point.

The second parasitic branch 4 is an external parasitic high-frequency radiator corresponding to a third resonance point, and a weak coupling is formed between the first parasitic branch 4 and the high-frequency radiation branch 1 .

In conjunction with Fig. 1 and Fig. 6, a third specific embodiment of the present invention is described:

The high-frequency branch 1 and the first parasitic branch 3 are located in the projection of the clear surface on the terminal main board 10, the low-frequency radiation branch 2 is a single line extending along the top surface of the narrow frame; the second parasitic branch 4 A single trace that runs along the top surface of the narrow bezel. A coupling sheet 12 is provided above or below the slot 6-3 to enhance coupling. The coupling sheet is a metal sheet.

The high-frequency radiation branch 1 is a main high-frequency radiator, correspondingly generating a first resonance point.

The first parasitic branch 3 is an internal parasitic high-frequency radiator, which extends close to the first branch 1 and can be adjusted in length according to actual debugging requirements, correspondingly generating a second resonance point.

The second parasitic branch 4 is an external parasitic high-frequency radiator corresponding to a third resonance point, and a weak coupling is formed between the first parasitic branch 4 and the high-frequency radiation branch 1 .

The method of adding a capacitor or a capacitive element or a coupling plate described in the above-mentioned embodiments 2 and 3 can further strengthen the coupling strength between the high-frequency radiation branch 1 and the first parasitic branch 3 to meet the radiation requirement.

It should be noted that the above-mentioned structure provides several implementation modes in combination with specific content, and it should not be considered that the specific implementation of the present invention is limited thereto. Any similarity or similarity with the structure of the present invention, or some technical deduction or replacement under the premise of the present invention should be regarded as the protection scope of the present invention.

Claims (9)

1. a multiple-limb mobile terminal antenna, comprises a main antenna body and a passive antenna body, it is characterized in that: described passive antenna body includes the parasitic branch of more than two-way or two-way.

2. a kind of multiple-limb mobile terminal antenna according to claim 1, is characterized in that: described passive antenna body comprises one near the first parasitic branch of described main antenna body, and away from the second parasitic branch of described main antenna body.

3. a kind of multiple-limb mobile terminal antenna according to claim 2, is characterized in that: described main antenna body is provided with a high-frequency branch, and described first parasitic branch near described high-frequency branch, and forms coupling with it.

4. a kind of multiple-limb mobile terminal antenna according to claim 3, is characterized in that: described first parasitic branch extends along described high-frequency branch bearing of trend.

5. a kind of multiple-limb mobile terminal antenna according to claim 3, is characterized in that: be connected with electric capacity or capacitive element between the high-frequency branch of described main antenna body and the first parasitic branch.

6. a kind of multiple-limb mobile terminal antenna according to claim 3, is characterized in that: be formed with half between the high-frequency branch of described main antenna body and the first parasitic branch and close gap, be provided with coupling piece above or below described gap.

7. a kind of multiple-limb mobile terminal antenna according to any one of claim 2 to 6, it is characterized in that: described passive antenna body also comprises a trixenie branch, this trixenie branch is created on the connecting portion of the first parasitic branch and the second parasitic branch, and described trixenie branch is near the first parasitic branch and extend along its bearing of trend.

8. apply the mobile terminal of the multiple-limb mobile terminal antenna described in any one of the claims 1 to 7 for one kind, described mobile terminal is provided with frame, it is characterized in that: described multiple-limb mobile terminal antenna bends when mounted, after bending, described high-frequency branch and the first parasitic branch are positioned at the headroom end on projection district on terminal mainboard, described low frequency branch extends along the inwall of terminal frame, and described second parasitic branch extends along the inwall of terminal frame.

9. mobile terminal according to claim 8, is characterized in that: described trixenie branch is positioned at the headroom end on projection district on terminal mainboard.