WO2012034365A1

WO2012034365A1 - Antenna device and mobile terminal

Info

Publication number: WO2012034365A1
Application number: PCT/CN2011/070332
Authority: WO
Inventors: 朱强; 侯志强; 唐金欢; 李帅; 胡铁魁; 郭海超
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-09-17
Filing date: 2011-01-17
Publication date: 2012-03-22
Also published as: CN102044740B; CN102044740A

Abstract

An antenna device is provided by the present invention, which involves mobile communication technical field. The antenna device includes a main antenna, an enhanced antenna, a frame of the main antenna and a fixture; the shape of said main antenna is flat, said main antenna is fixed on the frame of the main antenna; said enhanced antenna connects with the fixture, and can be extended and retracted. The enhanced antenna is located at one side of the frame of the main antenna, and is electrically contacted with said main antenna. The enhanced antenna receives and sends the signals together with the main antenna. A mobile terminal with said antenna device is also provided in the present invention. The antenna device and the mobile terminal provided in the present invention can reduce the influence to the antenna radiation caused by the exterior, and the performance of the antenna is effectively improved.

Description

Antenna device and mobile terminal

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

At present, antennas are widely used in various communication device terminals, and antennas such as mobile phones have built-in antennas. The antenna can be divided into an internal antenna and an external antenna depending on the location. The built-in antenna can be further divided into: PIFA antenna, Monopole antenna, Dipole antenna, IFA antenna, etc. according to the working principle. The external antenna typically includes a helical antenna and a whip or whip antenna that protrudes outside the terminal. When the whip or whip antenna is retracted into the terminal, the helical antenna operates, and when the whip or whip antenna extends from the terminal, the whip or whip antenna works in conjunction with the helical antenna.

With the miniaturization of the mobile terminal, the user may touch the user's body when answering the call. This physical contact distinguishes the antenna characteristics from its free space characteristics, thereby degrading the overall performance of the handset. Therefore, the current mobile phones basically use the built-in antenna, but in the case of a weak base station signal in a harsh environment, the built-in antenna cannot guarantee the call quality.

Although there are some mobile terminals with built-in antennas and whip antennas in the prior art, the functions of the built-in antennas and the whip antennas are only operated by the built-in antenna when the system judges that the mobile phone is in an idle state, and are switched by the built-in antenna when the system is in a call state. To the whip antenna, work by the whip antenna. However, the influence of the human body, especially the human head, on the external antenna such as the whip antenna is huge, and it is possible to reduce the transmission power of the antenna by 8 to 10 dBm, which will seriously affect the performance of the mobile phone. Summary of the invention

The main object of the present invention is to provide an antenna device and a mobile terminal, which are intended to effectively improve Cell phone antenna performance.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

An antenna device includes a main antenna, a booster antenna, a main antenna bracket and a fixing device; the main antenna has a sheet shape and is fixed on the main antenna bracket; the booster antenna is connected to the fixing device, and is a telescopic antenna. One side of the main antenna holder is electrically connected to the main antenna and receives and transmits signals together with the main antenna.

The main antenna includes a first antenna portion and a second antenna portion, the first antenna portion is disposed in a ring shape in a counterclockwise direction from a right upper end of the main antenna holder, and one side of the first antenna portion is The fixing device is in contact with the conduction; the second antenna portion is spaced apart from the first antenna portion.

When the reinforcing antenna is in a contracted state, it is in a non-contact state with the fixing device; when the reinforcing antenna is in a stretched state, it is in a contact conduction state with the fixing device.

The middle section of the reinforced antenna is provided with a groove; when the reinforced antenna is in a contracted state, the groove is in a clearance fit with the inner wall of the fixing device for bringing the reinforced antenna and the fixing device into a non-contact state.

The inner wall of the fixing device is provided with a spring piece; when the reinforcing antenna is in a stretched state, the elastic piece and the reinforcing antenna end piece have an interference fit for bringing the reinforcing antenna and the fixing device into a contact conduction state.

The first antenna portion and the second antenna portion are spaced apart by 0.1 to 5 mm.

The primary antenna is a PIFA, Monopole, Dipole or IFA antenna.

A mobile terminal includes an antenna device, the antenna device is provided with a main antenna, a booster antenna, a main antenna bracket and a fixing device; the main antenna has a chip shape and is fixed on the antenna bracket; the enhanced antenna and the fixing device Connected, a telescopic antenna, located on one side of the antenna support and electrically connected to the main antenna, and receiving and transmitting signals together with the main antenna.

The main antenna includes a first antenna portion and a second antenna portion. The first antenna portion is disposed in a ring shape in a counterclockwise direction from a right upper end of the main antenna holder, and one side of the first antenna portion The fixing device is in contact with the conduction; the second antenna portion is spaced apart from the first antenna portion.

The antenna device and the mobile terminal provided by the invention jointly receive and transmit signals through the main antenna and the enhanced antenna, thereby reducing external influence on the antenna radiation, and effectively improving the performance of the antenna. DRAWINGS

1 is a schematic structural view of an antenna device according to an embodiment of the present invention;

2 is a schematic structural diagram of an antenna device according to an embodiment of the present invention;

3 is a schematic structural diagram of an antenna device according to another embodiment of the present invention;

4 is a schematic structural diagram of an antenna device according to still another embodiment of the present invention;

Figure 5 is a graph showing the return loss of the enhanced antenna in a contracted state in the above embodiment of the present invention;

6 is a waveform diagram of a wave loss when a booster antenna is in a stretched state according to an embodiment of the present invention; FIG. 7 is a reference data diagram of efficiency when a booster antenna is in a contracted state according to an embodiment of the present invention; FIG. 9 is a reference data diagram of a total radiated power and an omnidirectional sensitivity when the enhanced antenna is in a contracted state according to an embodiment of the present invention;

Figure 10 is a reference data diagram showing total radiated power and omnidirectional sensitivity of an enhanced antenna when it is in a stretched state in accordance with an embodiment of the present invention. detailed description

In the present invention, the mobile terminal may be a communication device such as a mobile phone, and the present invention will be described in detail below by taking a mobile phone as an example. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

1 shows the structure of an antenna device in an embodiment of the present invention, the antenna device package The main antenna 10 includes a main antenna 10, a main antenna holder 30, and a fixing device 40. The main antenna 10 has a chip shape and is fixed on the main antenna holder 30. The reinforcing antenna 20 is connected to the fixing device 40 and is a telescopic antenna. One side of the bracket 30 is electrically connected to the main antenna 10, and receives and transmits signals together with the main antenna 10.

The main antenna 10 may be a single-band antenna or a multi-band antenna (above two frequency bands), and may be arranged in a variety of patterns to accommodate users of different frequency bands in different regions of the world. The main antenna 10 also prevents the conventional antenna from operating in the high frequency band, and the asymmetric antenna radiation pattern formed by the asymmetric feed form prevents the performance degradation encountered with the whip antenna. Main antenna

The material of the 10 is variously selected and can be fixed to the main antenna holder 30 by means of a metal sheet or attached to the main antenna holder 30 in the form of an FPC (Flexible Printed Circuit).

The main antenna holder 30 can be used to fix the main antenna 10, and a fixing device 40 that supports the connection enhancing antenna 20. The reinforced antenna 20 can be used in conjunction with the main antenna 10 by direct contact or coupling with the main antenna 10 in accordance with the appearance and performance requirements, in the form of a single or multi-section lever.

Embodiments of the present invention improve signal reception and transmission and improve antenna performance by providing an enhanced antenna 20 that operates in conjunction with the primary antenna 10.

Referring to Figure 2, there is shown a schematic structural view of a main antenna 10 in accordance with an embodiment of the present invention. The main antenna 10 includes a first antenna portion 11 and a second antenna portion 12, wherein the first antenna portion 11 is disposed in a ring shape in a counterclockwise direction from the upper right end of the main antenna holder 30, and one side thereof and the fixing device 40 contact conduction; the second antenna portion 12 is spaced apart from the first antenna portion 11.

The working frequency band of the mobile phone is composed of low frequency 800MHz ~ 900MHz and high frequency 1700MHz ~ 2100MHz. In the embodiment of the present invention, by the above arrangement, the entire trace length of the first antenna portion 11 forms a low frequency 800 MHz ~ 900 MHz resonance, and the first antenna portion 11 is wound around the upper portion 111 of the main antenna holder 30 (refer to FIG. 3) and The initial portion 112 of the trace is coupled to generate a coupling High frequency 1700MHz ~ 1900MHz resonance. The second antenna portion 12 and the first antenna portion 11 are separated by a distance L, and the two portions can be coupled to generate a resonance of 1900 ~ 2100 MHz, thereby obtaining the full frequency band of the mobile phone. In an embodiment, the value of L may be in the range of 0.1 to 5 mm. In a specific example, the L value may be 0.1 mm; in another specific example, the L value may be 2.5 mm; in yet another specific example, the L value may be 5 mm. In view of the current physical size of the mobile phone, the L value of the present invention is preferably 1.5 mm.

Whether the frequency generated by the first antenna portion 11 can reach the standard value, the parameters such as the standing wave ratio and the return loss can be viewed by the vector network analyzer during debugging, and the radiation area or the length of the trace can be adjusted according to the parameter, thereby achieving the pre-preparation. Set goals.

Preferably, the above main antenna may be a PIFA, Monopole, Dipole or IFA antenna. The booster antenna 20 can be switched on by the fixture 40 to apply the strength of the overlay signal. For example, in an embodiment, the booster antenna 20 may be placed in a non-contact state with the fixture 40 when in the contracted state; and in contact with the fixture 40 when the booster antenna 20 is stretched.

In an embodiment, the middle portion of the reinforced antenna 20 may be provided with a recess 21 which, when retracted, is in a clearance fit with the inner wall of the fixture 40 such that the reinforced antenna 20 and the fixture 40 are in a non-contact state. At this time, since the electromagnetic waves between the main antenna 10 and the booster antenna 20 are coupled to each other due to the close distance, the booster antenna 20 can be coupled to the first antenna portion 11 in the main antenna 10 to generate a low frequency of 800 MHz. The 900 MHz resonance, as an extension of the main antenna 10 and the main antenna 10, radiates simultaneously, operating in the desired frequency band.

In addition, a spring piece may be disposed on the inner wall of the fixing device 40, and when stretched, the elastic piece and the end portion of the reinforcing antenna 20 have an interference fit, so that the reinforcing antenna 20 and the fixing device 40 are in a contact conduction state. At this time, the booster antenna 20 is electrically connected to the fixing device 40 to be electrically connected to the first antenna portion 11 of the main antenna 10, and generates a resonance of a low frequency of 800 MHz to 900 MHz. It should be noted that the electrical length also needs to be the same as when the antenna 20 is in the contracted state. The equivalent electrical length is equivalent when coupled. Since the booster antenna 20 acts as an external antenna, no other metal device hinders transmission and reception, and the combined antenna of the enhanced antenna 20 and the main antenna 10 has a deeper standing wave curve with respect to the closed state, and the efficiency of the entire antenna device is much better.

Figure 5 shows the return loss curve of the antenna device when the antenna 20 is retracted. Figure 6 shows the return loss curve of the antenna device when the antenna 20 is stretched. Comparing Fig. 5 and Fig. 6, it can be clearly seen that in the useful frequency band, the curve in Fig. 6 is lower than the curve in Fig. 5, and the efficiency is also higher.

Figure 7 shows the efficiency data of the antenna device when the antenna 20 is retracted. Figure 8 shows the efficiency data of the antenna device when the antenna 20 is stretched. As can be seen from the comparison, the average efficiency of the antenna device of the enhanced antenna 20 during stretching is higher, reaching 70%, and only 63% when contracting.

Figures 9 and 10 show the total Radiated Power (TRP) and Total Isotropic Sensitivity (TIS) comparison data of the antenna device when the antenna 20 is contracted and stretched, respectively.

In the embodiment of the present invention, when the base station coverage signal is strong, the enhanced antenna 20 is retracted into the inner portion of the casing, and a part of the main antenna 10 cooperates with the main antenna 10 to jointly transmit and receive signals. Even if the human body has an influence on signal transmission and reception, it can be overcome by the booster antenna 20. When the base station covers a harsh environment where the signal is weak or weak, the enhanced antenna 20 can be pulled out of the casing, and the enhanced antenna 20 works together with the main antenna 10, and the enhanced antenna 20 operates as an independent external antenna. No other metal interferes with it, and all aspects of performance are better than the contraction state, which can effectively improve the performance of the mobile phone antenna, thereby ensuring communication of the mobile phone.

The present invention provides a mobile terminal including the above antenna device. For the structure and working process of the above antenna device, reference may be made to the foregoing embodiments, and details are not described herein. In the embodiment of the present invention, since the antenna device is provided, when the mobile terminal performs communication, the influence of the human body on the radiation can be reduced, and the performance of the mobile terminal can be improved. The mobile terminal can communicate even if it is in a weak signal state. Preferably, the mobile terminal is a mobile phone.

As can be seen from the above, the antenna device and the mobile terminal provided by the present invention can effectively improve Cell phone antenna performance.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are used directly or indirectly in other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

Claim

An antenna device, comprising: a main antenna, a booster antenna, a main antenna bracket, and a fixing device; the main antenna has a chip shape and is fixed on the main antenna bracket; and the booster antenna is connected to the fixing device. The telescopic antenna is located at one side of the main antenna bracket and is electrically connected to the main antenna to receive and transmit signals together with the main antenna.

2. The antenna device according to claim 1, wherein the main antenna comprises a first antenna portion and a second antenna portion, the first antenna portion being from a right upper end of the main antenna holder, in a counterclockwise direction The coil is disposed in a ring shape, and one side of the first antenna portion is in contact with the fixing device; and the second antenna portion is spaced apart from the first antenna portion.

The antenna device according to claim 1 or 2, wherein when the enhanced antenna is in a contracted state, it is in a non-contact state with the fixing device; when the reinforcing antenna is in a stretched state, The fixing device is in a contact conducting state.

The antenna device according to claim 3, wherein the middle portion of the reinforced antenna is provided with a groove; when the reinforced antenna is in a contracted state, the groove is in a clearance fit with the inner wall of the fixing device for enhancing The antenna is in a non-contact state with the fixture.

The antenna device according to claim 4, wherein the inner wall of the fixing device is provided with a spring piece; when the reinforcing antenna is in a stretched state, the elastic piece and the reinforcing antenna end portion have an interference fit, The contact between the enhanced antenna and the fixture is in a conducting state.

The antenna device according to claim 2, wherein the first antenna portion and the second antenna portion are spaced apart by 0.1 to 5 mm.

The antenna device according to claim 1, wherein the main antenna is a PIFA, Monopole, Dipole or IFA antenna.

A mobile terminal, comprising: an antenna device, wherein the antenna device is provided with a main antenna, a booster antenna, a main antenna bracket and a fixing device; the main antenna has a chip shape and is fixed on the antenna bracket; The enhanced antenna is connected to the fixing device, which is a telescopic antenna, located in the day One side of the line bracket is electrically connected to the main antenna and receives and transmits signals together with the main antenna.

The mobile terminal according to claim 8, wherein the main antenna comprises a first antenna portion and a second antenna portion, wherein the first antenna portion is from a right upper end of the main antenna holder, and is counterclockwise Provided in a loop shape, one side of the first antenna portion is in contact with the fixing device; and the second antenna portion is spaced apart from the first antenna portion.

The mobile terminal according to claim 8 or 9, wherein when the booster antenna is in a contracted state, it is in a non-contact state with the fixing device; when the booster antenna is in a stretched state, The fixing device is in a contact conducting state.