WO2015078337A1

WO2015078337A1 - Antenna denoising device and mobile terminal

Info

Publication number: WO2015078337A1
Application number: PCT/CN2014/091925
Authority: WO
Inventors: Wenshui LIU
Original assignee: Byd Company Limited
Priority date: 2013-11-29
Filing date: 2014-11-21
Publication date: 2015-06-04
Also published as: CN203690497U

Abstract

An antenna denoising device includes a PCB (100), a PCB antenna (200) disposed on the PCB (100), a connecting cable (300), a ground copper (400) disposed on the PCB antenna (200), and an wave absorbing sheet (500). The connecting cable (300) defines a terminal fixed on the PCB (100) and connected with the PCB antenna (200). The ground copper (400) includes a front side and a back side, where the back side. The wave absorbing sheet (500) is fixed on the front side of the ground copper (400).

Description

ANTENNA DENOISING DEVICE AND MOBILE TERMINAL

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority and benefits of Chinese Patent No. 201320778280. X, filed with State Intellectual Property Office on November 29, 2013, the entire content of which is incorporated herein by reference.

FIELD

Embodiments of the present disclosure generally relate to an antenna technology filed, and more particularly to an antenna denoising device and a mobile terminal including the antenna denoising device.

BACKGROUND

Nowadays, the use of tablet products (such as tablet computers and tablet cell phone) is more common, and the tablet products have more functions. Global satellite system (GPS) has become increasingly common in tablet products, and Global satellite system is one of the important performances of tablet products. At the same time, the tablet products have more functions and the space of a tablet product is limited, so it is more inclined to use flexible printed circuit (FPC) antenna or printed circuit board (PCB) antenna as the GPS antenna.

Due to the structure of the tablet products, the space for the antenna is small and a distance between the antenna and a printed circuit board assembly (PCBA) is relatively small, so that it is difficult to improve the antenna gain, and the antenna is easy to be interfered by a system noise. Specially, the system noise is coupled to the antenna via a negative electrode (GND) of the system thereby reducing the active performance of the antenna.

SUMMARY

Embodiments of the present disclosure seek to solve at least one of the problems existing in the related art to at least some extent.

Embodiments of a first aspect of the present disclosure provide an antenna denoising device. The antenna denoising device includes: a PCB； a PCB antenna disposed on the PCB； a connecting cable defining a terminal fixed on the PCB and connected with the PCB antenna； a ground copper disposed on the PCB antenna and including a front side and a back side, in which the back side is grounded； and a wave absorbing sheet fixed on the front side of the ground copper.

With the antenna denoising device according to embodiments of the present disclosure, the wave absorbing sheet is disposed on the ground copper and capable of absorbing radio waves, so the wave absorbing sheet may absorb a noise coupled from the ground (GND) and then converts the noise into other energy, such as heat energy, so as to reduce the noise of the PCB antenna and to ensure that an active performance of the PCB antenna may not be reduced. With respect to an antenna of a conventional tablet product in the prior art that the noise may be coupled to the antenna via the ground and thus the active performance of the antenna is reduced, the antenna denoising device according to embodiments of the present disclosure may solve the problem of active performance reduction.

Embodiments of a second aspect of the present disclosure provide a mobile terminal. The mobile terminal includes the above described antenna denoising device.

With the mobile terminal according to embodiments of the present disclosure, the wave absorbing sheet is disposed on the ground copper and capable of absorbing radio waves, so the wave absorbing sheet may absorb a noise coupled from the ground (GND) and then converts the noise into other energy, such as heat energy, so as to reduce the noise of the PCB antenna and to ensure that an active performance of the PCB antenna may not be reduced. With respect to an antenna of a conventional tablet product in the prior art that the noise may be coupled to the antenna via the ground and that thus the active performance of the antenna is reduced, the antenna denoising device according to embodiments of the present disclosure may solve the problem of active performance reduction.

Additional aspects and advantages of embodiments of present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the accompanying drawings, in which:

Fig. 1 is a schematic view of an antenna denoising device according to an embodiment of the present disclosure；

Fig. 2 is a schematic view of an antenna denoising device without an wave absorbing sheet and a ground copper according to an embodiment of the present disclosure；

Fig. 3 is a schematic view of an antenna denoising device without an wave absorbing sheet according to an embodiment of the present disclosure

Fig. 4 is a schematic view of a ground copper of an antenna denoising device according to an embodiment of the present disclosure；

Fig. 5 is a schematic view of an wave absorbing sheet according to an embodiment of the present disclosure； and

Fig. 6 is a schematic view of a mobile terminal according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

Reference will be made in detail to embodiments of the present disclosure. Embodiments of the present disclosure will be shown in drawings, in which the same or similar elements and the elements having same or similar functions are denoted by like reference numerals throughout the descriptions. The embodiments described herein according to drawings are explanatory and illustrative, not construed to limit the present disclosure.

The following description provides a plurality of embodiments or examples configured to achieve different structures of the present disclosure. In order to simplify the publishment of the present disclosure, components and dispositions of the particular embodiment are described in the following, which are only explanatory and not construed to limit the present disclosure. In addition, the present disclosure may repeat the reference number and/or letter in different embodiments for the purpose of simplicity and clarity, and the repeat does not indicate the relationship of the plurality of embodiments and/or dispositions. Moreover, in description of the embodiments, the structure of the second characteristic “above” the first characteristic may include an embodiment formed by the first and second characteristic contacted directly, and also may include another embodiment formed between the first and the second characteristic, in which the first characteristic and the second characteristic may not contact directly.

In the description of the present disclosure, unless specified or limited otherwise, it should be noted that, terms “mounted, ” “connected” and “coupled” may be understood broadly, such as electronic connection or mechanical connection, inner communication between two elements, direct connection or indirect connection via intermediary. These having ordinary skills in the art should understand the specific meanings in the present disclosure according to specific situations.

With reference to the following descriptions and drawings, these and other aspects of embodiments of the present disclosure will be distinct. In the descriptions and drawings, some particular embodiments are described in order to show means of the principles of embodiments according to the present disclosure, however, it should be appreciated that the scope of embodiments according to the present disclosure is not limited. On the contrary, embodiments of the present disclosure include all the changes, alternatives, and modifications falling into the scope of the spirit and principles of the attached claims.

In the following, an antenna denoising device and a mobile terminal are described in detail with reference to Figs. 1-6.

Fig. 1 is a schematic view of an antenna denoising device according to an embodiment of the present disclosure. As shown in Fig. 1, the antenna denoising device includes a PCB 100, a PCB antenna 200, a connecting cable 300, a ground copper 400 and a wave absorbing sheet 500. The PCB antenna 200 is disposed on the PCB 100. A terminal of the connecting cable 300 is connected with or fixed on the PCB 100, and is connected with the PCB antenna 200. The ground copper 400 is connected with or disposed on the PCB antenna 200.

Fig. 4 is a schematic view of a ground copper according to an embodiment of the present disclosure. As shown in Fig. 4, the ground copper 400 includes a front side 402 and a back side 403, and the back side 403 is connected with ground 700. The wave absorbing sheet 500 is disposed on the front side 402 of the ground copper 400.

Fig. 2 is a schematic view of an antenna denoising device according to an embodiment of the present disclosure, in which the wave absorbing sheet and the group copper are not shown. Fig. 3 is a schematic view of an antenna denoising device according to an embodiment of the present disclosure, in which the wave absorbing sheet is not shown. As shown in Fig. 1, Fig. 2 and Fig. 3, the connecting cable 300 includes a shielding layer 301, the shielding layer 301 is covered on the outer wall of terminal part of the connecting cable 300 connected with the PCB antenna 200. The shielding layer 301 is used to shield an air noise.

With the antenna denoising device according to embodiments of the present disclosure, the wave absorbing sheet 500 is disposed on the ground copper 400 and capable of absorbing radio waves, so the wave absorbing sheet 500 may absorb a noise of the ground copper 400 coupled from the ground 700, and then convert the noise into other energy, such as heat energy, so as to reduce the noise energy of the PCB antenna 200 and to ensure that an active performance of the PCB antenna 200 may not be reduced. With respect to an antenna of a conventional tablet product in the prior art that the noise may be coupled to the antenna via the ground and thus the active performance of the antenna is reduced, the antenna denoising device according to embodiments of the present disclosure may solve the problem of active performance reduction.

Fig. 5 is a schematic view of a wave absorbing sheet according to an embodiment of the present disclosure. As shown in Fig. 5, an adhesive 501 is provided on a side of the wave absorbing sheet 500, and the wave absorbing sheet 500 is bonded or fixed on the ground copper 400 by the adhesive 501. In some embodiments, the ground 700 may keep clean, especially when the PCB antenna 200 is receiving GPS signals using the ground 700 of PCBA as a reference level. The noise of the system from an operation of the system and the mix of frequencies, the ground 700 may be interfered. The signal of the ground 700 is very low and is usually around -130dBm, so the noise may be highly restricted, and thus the ground 700 of the PCB antenna 200 may keep clean.

In some embodiments, when the wave absorbing sheet 500 is bonded to the ground copper 400, the wave absorbing sheet 500 is closely adhered onto the ground copper 400, and thus the wave absorbing sheet 500 is closely bonded to the ground copper 400. In some embodiments, an adhesive 501 is provided on one side of the wave absorbing sheet 500, the wave absorbing sheet 500 is bonded with or fixed on the ground copper 400 by the adhesive 501, so that the wave absorbing sheet 500 can efficiently absorb the noise from the ground copper 400 and convert the noise into heat energy to reduce the noise of the ground copper 400.

In an embodiment of the present disclosure, the ground copper 400 is bonded on the ground 700. The PCB 100 is flat and a part of the PCB antenna 200 may be apart from the PCB 100, e.g. the PCB antenna 200 is connected with the PCB 100 via the connecting cable 300. The ground copper 400 is usually disposed on the PCB antenna 200, thus maintaining a grounding performance of the PCB 100. The ground copper 400 may match with the ground 700 to ensure that a reference ground of the PCB antenna 200 may meet a grounding requirement of the PCB antenna 200, thus improving the efficiency of the PCB antenna 200.

In an embodiment of the present disclosure, the ground copper 400 is partially covered, completely covered by the wave absorbing sheet 500, or the ground copper 400 has a surface area greater than that of the wave absorbing sheet 500. In some embodiments, as shown in Fig. 1, the ground copper 400 and the wave absorbing sheet 500 may form a substantial cross shape. In order to ensure that the wave absorbing sheet 500 can efficiently absorb the noise of the ground copper 400 and the noise of the ground copper 400 can be converted into the heat energy so as to reduce the noise of the ground copper 400 and improve the stability and the reception performance of the GPS signal, the ground copper 400 can be partially covered or completely covered by the wave absorbing sheet 500 or the ground copper 400 may have a surface area greater than that of the wave absorbing sheet 500.

In some embodiments, the ground copper 400 can be completely covered the wave absorbing sheet 500. In some embodiments, the wave absorbing sheet 500 has a surface area which is three times of that of the ground copper 400. Then the noise absorption performance of the wave absorbing sheet 500 may be better.

In some embodiments, the surface area of the wave absorbing sheet 500 is limited, as long as the ground copper 400 can be partially covered or completely covered the wave absorbing sheet 500 so as to ensure that the wave absorbing sheet 500 can efficiently absorb the noise of the ground copper 400 and the noise can be converted into the heat energy. In this way, the noise of the ground copper 400 may be reduced, and both the stability and the reception performance of the GPS signal may be enhanced.

In an embodiment of the present disclosure, a thickness of the wave absorbing sheet 500 ranges from 0.12mm to 0.18mm. Due to the structural characteristic of the plate, the thickness of the wave absorbing sheet material may be limited. In some embodiments, the thickness of the wave absorbing sheet 500 may range from 0.12mm to 0.18mm. In some embodiments, the thickness of wave absorbing sheet 500 may be 0.15mm. In some embodiments, there is no significant limitation of the cost and the structure, the wave absorbing sheet material may be thicker.

In some embodiments, as shown in Fig. 1, Fig. 3 and Fig. 4, the antenna denoising device further includes an oxidation resistant plastic layer 600, and the oxidation resistant plastic layer 600 is formed on the front side 402 of the ground copper 400 not covered the wave absorbing sheet 500. In this way, the oxidation of the ground copper 400 can be effectively prevented and the life of the ground copper 400 may be prolonged.

In an embodiment of the present disclosure, the ground copper 400 includes a grounded conductive copper foil.

In some embodiments, the wave absorbing material 500 contains at least one selected form a group consisting of ferrites, ultrafine metallic powder coatings, ultrafine magnetic powder coatings of metal oxide, and ceramic wave absorbing coatings. In an embodiment, the wave absorbing material 500 is made from ferrites.

In an embodiment of the present disclosure, the connecting cable 300 and the ground copper 400 are welded to the PCB antenna 200.

The assembling process of the antenna denoising device will be described as follows.

First the PCB antenna 200 is disposed on the PCB 100, and a terminal of the connecting cable 300 is fixed on the PCB 100 and is connected with the PCB antenna 200. Then the ground copper 400 is connected with the PCB antenna 200, and the wave absorbing sheet 500 is disposed on the front side of the ground copper 400.

The denoising process of the antenna denoising device will be described as follows.

According to embodiments of the present disclosure, the PCB antenna 200 receives the GPS signal, and the GPS signal is transmitted to the PCB 100 via the connecting cable 300 to be processed. At the same time, a return current of the GPS signal returns via the ground of the connecting cable 300 and the ground copper 400. The return current may go back via a lower impedance passage, and therefore the return current is mainly return via the ground copper 400. The system noise reaches the ground copper 400 via transmission of the ground, which may generate an interference and result in the GPS signal level jitter, thus reducing the active performance of the PCB antenna 200. The wave absorbing sheet 500 is disposed on the ground copper 400, absorbs the noise from the ground copper 400 and converts the noise into heat energy which may be dissipated, thus reducing the noise of the ground copper 400 and improving the stability and the reception performance of the GPS signal.

Embodiments of the present disclosure further provide a mobile terminal. Fig. 6 is a schematic view of a mobile terminal according to an embodiment of the present disclosure. The mobile terminal 10 includes the antenna denoising device described above. In some embodiments, the mobile terminal 10 includes at least one of a tablet computer, a personal digital assistant (PDA) , a tablet cell phone, and other mobile internet devices (MID) .

With the mobile terminal 10 according to embodiments of the present disclosure, the wave absorbing sheet 500 is disposed on the ground copper 400 and capable of absorbing radio waves, so the wave absorbing sheet 500 may absorb a noise of the ground copper 400 coupled from the ground 700, and then convert the noise into other energy, such as heat energy, so as to reduce the noise energy of the PCB antenna 200 and to ensure that an active performance of the PCB antenna 200 may not be reduced. With respect to an antenna of a conventional tablet product in the prior art that the noise may be coupled to the antenna via the ground and thus the active performance of the antenna is reduced, the antenna denoising device according to embodiments of the present disclosure may solve the problem of active performance reduction.

Reference throughout this specification to “an embodiment, ” “some embodiments, ” “one embodiment” , “another example, ” “an example, ” “aspecific example, ” or “some examples, ” means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the phrases such as “in some embodiments, ” “in one embodiment” , “in an embodiment” , “in another example, ” “in an example, ” “in a specific example, ” or “in some examples, ” in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

Although explanatory embodiments have been shown and described, it would be appreciated by those skilled in the art that the above embodiments cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from spirit, principles and scope of the present disclosure.

Claims

An antenna denoising device, comprising:

a PCB；

a PCB antenna disposed on the PCB；

a connecting cable defining a terminal fixed on the PCB and connected with the PCB antenna；

a ground copper disposed on the PCB antenna and comprising a front side and a back side, wherein the back side is grounded； and

a wave absorbing sheet fixed on the front side of the ground copper.
The antenna denoising device of claim 1, further comprising an adhesive provided on a side of the wave absorbing sheet,

wherein the wave absorbing sheet is fixed on the ground copper by the adhesive.
The antenna denoising device of claim 1 or 2, wherein the ground copper is partially covered or completely covered by the wave absorbing sheet, or the ground copper has a surface area greater than that of the wave absorbing sheet.
The antenna denoising device of any one of claims 1-3, wherein a thickness of the wave absorbing sheet ranges from 0.12mm to 0.18mm.
The antenna denoising device of claim 3, further comprising an oxidation resistant plastic layer provided on a part of the ground copper not covered by the wave absorbing sheet.
The antenna denoising device of any one of claims 1-5, wherein the ground copper comprises a grounded conductive copper foil.
The antenna denoising device of any one of claims 1-6, wherein the wave absorbing material comprises at least one selected form a group consisting of ferrites, ultrafine metallic powder coatings, ultrafine magnetic powder coatings of metal oxide, and ceramic wave absorbing coatings.
The antenna denoising device of any one of claims 1-7, wherein the connecting cable and the ground copper are welded to the PCB antenna.
The antenna denoising device of any one of claims 1-8, wherein the ground copper and the wave absorbing sheet form a substantial cross shape.
A mobile terminal comprising an antenna denoising device of any one of claims 1-9.