WO2012065429A1

WO2012065429A1 - Antenna device and mobile terminal

Info

Publication number: WO2012065429A1
Application number: PCT/CN2011/075433
Authority: WO
Inventors: 陈亚军; 程守刚
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-11-19
Filing date: 2011-06-08
Publication date: 2012-05-24
Also published as: CN202050048U

Abstract

An antenna device and a mobile terminal are disclosed in the present utility model. The antenna device includes a printed circuit board (PCB) substrate, on which a gradual change direction array element structure, a secondary coupling radiation patch and a radio frequency power port are set; the gradual change direction array element structure is set on one side of the PCB substrate, and is connected to the radio frequency power port; and the secondary coupling radiation patch is set on the other side of the PCB substrate opposite to the side with the gradual change direction array element structure, and is connected to the ends of two elements in the gradual change direction array element structure. The above technical solution of the present utility model can reduce the volume of the antenna, thus being more beneficial to the design requirement for an ultrathin terminal. The reasonable layout of the secondary coupling radiation patch and the gradual change direction array elements can improve the space utilization ratio. The secondary coupling radiation patch is powered by two printed array elements in the gradual change direction array elements, and is coupled with the gradual change direction array elements, thus further broadening frequency band characteristic.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to an antenna device and a mobile terminal. BACKGROUND With the continuous evolution of mobile communication from the second generation to the third generation, terminal devices that can work in two or more systems and multiple frequency bands at the same time are more and more popular, such as dual-mode dual-standby mobile phones, etc. Highlights of 3G phones. In order to achieve multi-band operation, and to achieve multiple functions such as communication and data transmission, such as additional GPS, BT, WLAN and other data service functions, in response to this demand, single-antenna technology covers 0.8GHz-2.5GHz ultra-wideband. The omnidirectional work not only saves equipment space and cost, but also facilitates the development trend of i-type and ultra-thinness of mobile terminals. The existing broadband antenna technology mainly focuses on the improved design of antenna forms such as PFIA and IFA, such as adding a short circuit point at the maximum current point of the patch, and reducing the size of the antenna under the dual frequency characteristic; additional parasitic structure The same can be used to broaden the frequency band; to increase the slotted structure, to extend the current path, etc., the inventors have found that in the above-mentioned solutions in the related art, with the increase of the mobile communication mode, the expansion of the frequency band, and the demand for data services, the above improvements The mode is still insufficient in bandwidth. The return loss of the traditional terminal antenna shown in Figure 1 can only work in two main communication bands, and cannot be used for data services such as BT, WLAN, and GPS, and the introduction of parasitic further The spatial distance is compressed, and it is difficult to implement on a miniaturized, ultra-thin terminal, and it is necessary to develop an antenna with a wider frequency band and more adaptability to meet the technical development needs of the wireless communication terminal. In response to the above problems, no effective solution has been proposed yet. The utility model relates to the related art, the antenna technology has a narrow frequency band, a large size, and a high cost under the multi-antenna scheme, and the main purpose of the utility model is to provide an antenna device and a mobile terminal, so as to solve at least the above problems. One. According to an aspect of the present invention, an antenna device includes a PCB substrate, and the PCB substrate is provided with a gradient guiding array structure, a secondary coupling radiation patch, and an RF excitation port; On one side of the PCB substrate and connected to the RF excitation port; The sub-coupled radiation patch is disposed on the other side of the PCB substrate and is directed to the other side of the surface of the array structure, and the secondary coupling radiation patch is connected to the end of the two sections of the gradient-directed array structure. The PCB substrate is provided with a metal via hole, and the secondary coupling radiation patch and the two end portions of the gradation-directed array structure are connected by a metal via. The gradation-directed array structure includes a plurality of printing dies, wherein the plurality of printing dies are connected by a printing feed line, and the plurality of printing dies are sequentially increased from the inside to the outside, and the printing feeding line is connected to the RF excitation port. There are at least three of the plurality of printing frames described above, and there is a large gap between each of the plurality of printing frames. The printed feed line is connected to a central position of each of the plurality of printed frames. One or more of the plurality of printing frames are in a concave shape. The copper-clad area on the PCB substrate is provided with a clearance area, and the length and width of the clearance area are not less than the overall length and width of the gradient-oriented structure, and The secondary coupling patch is not connected. The area of the clearance area is larger than the area of the secondary patch. According to another aspect of the present invention, the present invention provides a mobile terminal, where the mobile terminal includes an antenna device, where The antenna device is the above-mentioned antenna device. The utility model adopts a plurality of printing matrix structures with a gradient leading to the array to realize the low frequency bandwidth, greatly reducing the required volume, and the bandwidth thereof has no requirement for the thickness of the terminal. It is more conducive to the design requirements of the terminal ultra-thin; the rational layout of the secondary coupling patch and the gradient leading to the array improves the utilization of the space; the secondary coupling patch is guided by the gradient to the two-stage printing array in the array. The excitation and mutual coupling with the gradual lead-in array further broaden the frequency band characteristics and realize the omnidirectional operating characteristics of ultra-wideband (0.8 GHz-2.5 GHz). BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate, illustrate, FIG In the drawings: FIG. 1 is a schematic diagram of a return loss curve of a conventional terminal antenna according to the related art; 2 is a schematic structural view of an antenna device according to an embodiment of the present invention; FIG. 3 is a schematic structural view of an antenna gradient frame according to a preferred embodiment of the present invention; and FIG. 4 is a second coupling patch of a preferred embodiment of the present invention. FIG. 5 is a schematic diagram of a return loss curve of an antenna device according to a preferred embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. 2 is a schematic structural view of an antenna device according to an embodiment of the present invention. As shown in FIG. 2, the device includes a PCB substrate 1. The PCB substrate 1 is provided with a gradient-directed array structure 2, a secondary coupling radiation patch 3, and an RF excitation port 4; the gradient-directed array structure 2 is disposed on one side of the PCB substrate 1 and is coupled to the RF excitation port 4 Connected; the secondary coupling radiation patch 3 is disposed on the other side of the surface of the PCB substrate 1 on which the gradient is directed to the array structure 2, and the secondary coupling radiation patch 3 and the gradient lead-oriented structure 2 The ends are connected. Preferably, as shown in FIG. 2, the PCB substrate 1 is provided with a metal via 5, and the two ends of the secondary coupling radiation patch 3 and the graded lead-in structure 2 are connected through the metal via 5. Preferably, the gradation-directed array structure 2 includes a plurality of printing dies, wherein the plurality of printing dies are connected by a printing feed line 6 , the plurality of printing dies are sequentially increased from the inside to the outside, and the printing feeder 6 and the RF excitation are sequentially applied. The ports are connected. Preferably, one or more of the plurality of printing frames are in a "concave shape". Preferably, at least three of the plurality of printing frames are arranged, and each of the plurality of printing frames has a large inter-majority. In the process, as shown in FIG. 3, the above-mentioned gradation-oriented structure 2 can be composed of five printing dies of different lengths, and a plurality of printing dies can realize wide-band operation characteristics, and the length of each printing ray is 20 mm-64 mm, and the width is 0.3-lmm, in order to ensure effective space utilization, the distance between the five printing frames is 0.5-1.5mm, and the center positions of the five printing frames are connected by a printing feeder 6, the width of the printing feeder is 0.5-2mm, and The PCB RF ports are connected. The fourth and fifth roots The end of the printed array is connected to the secondary bonding patch 3 through the metal via 5 on the PCB. To meet the low frequency bandwidth characteristics of the antenna device, the number of printed arrays needs to be greater than 3. It should be noted that the number of printed frames described above can be reasonably increased or decreased according to actual needs. As shown in FIG. 4, the area of the secondary coupling patch 3 is 80 to 320 mm2, and the size thereof is required to satisfy the fifth printing frame 8 and the fourth printing frame 7 which can be realized with the gradient guiding structure 2 through the PCB substrate 1. The metal vias 5 are connected to each other and cannot be connected to the copper-clad area of the PCB substrate 1. Preferably, the printed feed line 6 is connected to the center position of each of the plurality of printed frames, and it is experimentally proved that the frequency bandwidth obtained by this method is larger than that obtained by other methods. Preferably, the copper-clad area on the PCB substrate 1 is provided with a clearance area, and the length and width of the clearance area are not less than the overall length and width of the gradation-oriented structure, and are not connected to the secondary coupling patch. Preferably, the area of the clearance area may be larger than the area of the secondary patch. This design method effectively utilizes the board length and thickness of the PCB substrate to achieve spatial reusability. In order to better understand the advantages of the above embodiment with respect to the related art, as shown in FIG. 5, through the excitation of the RF excitation port 4 of the PCB, the surface current is first directed to the array structure 2 through the gradation, thereby realizing the 氐 frequency characteristic, and at the same time The two printed arrays leading to the array structure 2 are connected to the secondary coupling patch 3, and there is a certain voltage difference between the two connection points, and the TE10 mode of the secondary coupling patch 3 is excited to satisfy the high frequency characteristic. Requires, and further broadens the frequency band characteristics, achieving a return loss of less than -5dB at 800MHz-900GHz and a return loss of less than -7.5dB at 900MHz-2.5GHz. In a specific application, the antenna device in each of the foregoing embodiments may be applied to a mobile terminal (for example, a mobile phone), and the present invention further provides a mobile terminal, including an antenna device, where the antenna device is the foregoing various embodiments. The described antenna device. Based on the foregoing embodiments, it can be seen that the foregoing embodiment provides an ultra-wideband omnidirectional terminal antenna technology, and the ultra-wideband omnidirectional characteristic is realized by studying the radiation mechanism (the return loss is less than 800 MHz-900 GHz). -5dB, 900MHz-2.5GHz return loss is less than -7.5dB, ), a single antenna fully meets the electrical performance requirements of the communication and data services required by existing mobile technologies, and the gradient leads to the array structure and quadratic The coupling patch can be directly lithographically printed on both sides of the dielectric plate by the microstrip fabrication process, and the process is simple and reliable, thereby reducing the cost and facilitating the ultra-thinning and miniaturization of the terminal. The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made by those skilled in the art. Where in this practical Any modifications, equivalent substitutions, improvements, etc. within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

An antenna device, comprising a PCB substrate, wherein the PCB substrate is provided with a gradation-directed array structure, a secondary coupling radiation patch, and an RF excitation port;

The gradation-directed array structure is disposed on one side of the PCB substrate and connected to the RF excitation port; and the secondary coupling radiation patch is disposed on the PCB substrate. On the other side of the face on which the I-phase structure is located, the secondary coupled radiation patch is connected to the ends of the two segments of the graded leading-edge structure.

2. The device according to claim 1, wherein the PCB substrate is provided with a metal via, and the two coupling ends of the secondary coupling radiation patch and the gradient guiding array structure pass through the metal via Connected.

3. The apparatus according to claim 1, wherein

The gradation-directed array structure includes a plurality of printing dies, wherein the plurality of printing dies are connected by a printing feed line, the plurality of printing dies are sequentially incremented from inner to outer length, the printing feeding line and the radio frequency excitation The ports are connected.

4. The apparatus according to claim 3, wherein the plurality of printing frames are at least three, and each of the plurality of printing frames has a large inter-majority.

5. The apparatus according to claim 3, wherein the printed feed line is connected to a center position of each of the plurality of printing frames.

6. Apparatus according to claim 3, wherein one or more of the plurality of printed frames are "concave" shaped.

7. The apparatus according to claim 1, wherein

The copper-clad region on the PCB substrate is provided with a clearance area, and the length and width of the clearance area are not less than the overall length and width of the gradation-oriented structure, and are not connected to the secondary coupling patch.

8. The apparatus according to claim 7, wherein an area of the clearance area is larger than an area of the secondary bonding patch. A mobile terminal comprising an antenna device, the antenna device comprising the antenna device according to any one of claims 1-8.