Patent Publication Number: US-9847580-B2

Title: Printed antenna and terminal device

Description:
This application is a continuation of International Application No. PCT/CN2014/082014, filed on Jul. 11, 2014, which claims priority to Chinese Patent Application No. 201310329288.2, filed on Jul. 31, 2013, both of which are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present invention relates to the field of wireless communications technologies, and in particular, to a printed antenna and a terminal device. 
     BACKGROUND 
     With rapid development of mobile communications technologies, functions of a terminal product become increasingly diverse, and product dimensions tend to be compact, which impose a harsher and stricter requirement on a terminal antenna. At present, LTE (Long Term Evolution) products have gradually been put into commercial use, and some terminal products are also required to support an LTE frequency band. Because a bandwidth of the LTE frequency band is much broader than that of a 2G (the second generation mobile telecommunications technology) frequency band and that of a 3G (the third generation mobile telecommunications technology) frequency band. The LTE frequency band (698 MHz to 960 MHz, 1710 MHz to 2690 MHz) imposes a new requirement on a bandwidth of an antenna. A conventional antenna cannot satisfy a requirement for a sufficient bandwidth. In addition, because LTE communications imposes a quite high requirement on the antenna, antenna efficiency (a ratio of power radiated by an antenna to active power input into the antenna, where a numerical value of the ratio is constantly less than 1) cannot be too low (at least greater than 35% at the frequency band of 698 MHz to 960 MHz, and at least greater than 45% at the frequency band of 1710 MHz to 2690 MHz). 
     In the prior art, a structure of a terminal antenna is shown in  FIG. 1 , where  101  is a PCB (printed circuit board),  102  is an antenna pattern, and  103  is a signal feed-in point. The signal feed-in point is a connection point of an antenna and a connection point of a radio frequency circuit to feed in or feed out a signal. A size of the antenna is further reduced by means of printing the antenna on the PCB, but the power of the antenna is low and the bandwidth is narrow. Still further, a radio frequency circuit with an antenna may implement double resonance of a high frequency and a low frequency by adding a matching circuit, which may increase a resonance point, but cannot improve efficiency of the antenna, and also restricts improvement of the bandwidth. 
     SUMMARY 
     In view of this, an objective of the present invention is to provide a printed antenna and a terminal device, so that in a case in which an external device, such as an inductor or a capacitor, does not need to be connected to perform matching, a bandwidth of an antenna satisfies a requirement of a current LTE full frequency band, especially broadening a low frequency bandwidth of the antenna. Further, efficiency of the antenna at a high frequency band is improved. 
     According to a first aspect, a printed antenna is provided, where the printed antenna includes a printed circuit board, an antenna pattern, and a signal feed-in point, where the antenna pattern is printed on a front surface of the printed circuit board, and the antenna pattern includes a first antenna pattern, a second antenna pattern, and a third antenna pattern; the signal feed-in point is connected to the second antenna pattern; one end of a side, which is laid out along an edge of the printed circuit board, of the first antenna pattern is connected to the second antenna pattern; the second antenna is vertically laid out in parallel to an edge of the printed circuit board, where the second antenna pattern and the first antenna pattern form a non-closed rectangular; and the third antenna pattern includes a first part and a second part, where one end of the first part of the third antenna pattern is connected to the first antenna pattern, and one end of the second part of the third antenna pattern is connected to the second antenna pattern, and the first part and the second part are arranged in parallel in the non-closed rectangle. 
     In a first possible implementation manner of the first aspect, the printed antenna further includes a welding device, where that one end of the first part is connected to the first antenna pattern is specifically that: one end of the first part is connected to the first antenna pattern by using the welding device; and/or that one end of the second part is connected to the second antenna pattern is specifically that: one end of the second part is connected to the second antenna pattern by using the welding device. 
     With reference to the first aspect, or the first possible implementation manner of the first aspect, in a second possible implementation manner, the first part of the third antenna pattern includes at least two components, and the at least two components are connected by using the welding device; and/or the second part of the third antenna pattern includes at least two components, and the at least two components are connected by using the welding device. 
     With reference to the first aspect, or either of the foregoing possible implementation manners, in a third possible implementation manner, the first part of the third antenna pattern includes a width, a length, a shape, or a quantity, and the width, the length, the shape, or the quantity of the first part may be set to a fixed value; and/or the second part of the third antenna pattern includes a width, a length, a shape, or a quantity, and the width, the length, the shape, or the quantity of the second part may be set to a fixed value. 
     In a fourth possible implementation manner of the first aspect, the first antenna pattern includes a width and a length of the first antenna pattern, and the width and the length of the first antenna pattern may be set to a fixed value. 
     In a fifth possible implementation manner of the first aspect, the second antenna pattern includes a width and a length of the second antenna pattern, and the width and the length of the second antenna pattern may be set to a fixed value. 
     With reference to the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the welding device includes at least one of the following: a capacitor, an inductor, or a resistor. 
     According to a second aspect, a terminal device is provided, where the terminal device includes: at least one printed antenna according to the first aspect and any one of the foregoing possible implementation manners, and a communications module, where the communications module is configured to access a wireless network by using the printed antenna. 
     In a first possible implementation manner, the terminal device includes at least two printed antennas, where a first printed antenna is a primary antenna of the terminal device, and a second printed antenna is a secondary antenna of the terminal device; and the second printed antenna is a diversity antenna of the terminal device and implements diversity reception of a signal together with the first printed antenna. 
     With reference to the second aspect, or the first possible implementation manner of the second aspect, in a second possible implementation manner, the terminal device is specifically a data card, a wireless network interface card, a modem, a mobile phone, a portable computer that has a function of surfing the Internet, or a device that can perform wireless communication. 
     Based on the foregoing technical solutions, it is implemented that a bandwidth of a printed antenna satisfies a requirement of a current LTE full frequency band in a case in which a matching circuit does not need to be added, especially, a low frequency bandwidth of the antenna is broadened, which resolves a problem that a high frequency bandwidth is too broad, and meanwhile improves efficiency of the antenna at the full frequency band. Further, the printed antenna is printed on a printed circuit board, which requires no or few matching devices, thereby effectively reducing costs. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To describe the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments of the present invention. The accompanying drawings in the following description show merely some embodiments of the present invention, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. 
         FIG. 1  is a schematic structural diagram of a printed antenna in the prior art; 
         FIG. 2  is a schematic structural diagram of a printed antenna according to an embodiment of the present invention; 
         FIG. 3  is a Smith chart of a printed antenna measured in an embodiment of the present invention; 
         FIG. 4  is a schematic structural diagram of a printed antenna according to another embodiment of the present invention; 
         FIG. 5  is a schematic structural diagram of a printed antenna according to still another embodiment of the present invention; 
         FIG. 6  is a schematic structural diagram of a terminal device according to an embodiment of the present invention; and 
         FIG. 7  is a schematic structural diagram of a terminal device according to another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS 
     The following clearly describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. It should be understood that the described embodiments are a part rather than all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. 
     At present, in wireless communications technologies, a printed antenna is used to perform communication. However, a matching circuit needs to be added to implement double resonance of a high frequency and a low frequency. As a result, a size of the antenna cannot be reduced, and further, a low frequency bandwidth of the printed antenna cannot satisfy an LTE communications requirement, which leads to low efficiency of the antenna. Embodiments of the present invention provide a printed antenna that can satisfy a requirement of a current LTE full frequency band. Especially, a low frequency bandwidth of the antenna is broadened, which resolves a problem that a high frequency bandwidth is too broad, and meanwhile improves efficiency of the antenna at the full frequency band. Further, the printed antenna is printed on a printed circuit board, which requires no or few matching devices, thereby effectively reducing costs. 
       FIG. 2  is a schematic structural diagram of a printed antenna according to an embodiment of the present invention. As shown in  FIG. 2 , the printed antenna includes: a printed circuit board  201 , an antenna pattern, and a signal feed-in point  202 , where the antenna pattern is printed on a front surface of the printed circuit board  201 . 
     The antenna pattern includes: a first antenna pattern  203 , a second antenna pattern  204 , and a third antenna pattern  205 . 
     The signal feed-in point  202  is connected to the second antenna pattern  204 . 
     One end of a side, which is laid out along an edge of the printed circuit board  201 , of the first antenna pattern  203  is connected to the second antenna pattern  204 . 
     The second antenna pattern  204  is vertically laid out in parallel to an edge of the printed circuit board  201 , where the second antenna pattern  204  and the first antenna pattern  203  form a non-closed rectangular. 
     The third antenna pattern  205  includes a first part  2051  and a second part  2052 , where one end of the first part  2051  of the third antenna pattern  205  is connected to the first antenna pattern  203 , and one end of the second part  2052  of the third antenna pattern  205  is connected to the second antenna pattern  204 , and the first part  2051  and the second part  2052  are arranged in parallel in the non-closed rectangle. 
     In this embodiment of the present invention, one side of the first antenna pattern  203  is laid out along an edge of the printed circuit board  201 , and other sides of the antenna pattern  203  are laid out around a metal ground of the printed circuit board  201 . The signal feed-in point  202  is connected to the second antenna pattern  204 , and is disposed near the edge of the printed circuit board  201 . Electromagnetic coupling is generated between the first antenna pattern  203  and the metal ground of the printed circuit board  201  and a low frequency band of an antenna radiation bandwidth is generated. A specific low frequency band may be 698 MHz to 960 MHz. A length of the first antenna pattern  203  may be set, and a width of a gap between the first antenna pattern  203  and the printed circuit board  201  may also be set. 
     The second antenna pattern  204  is vertically laid out in parallel to the edge of the printed circuit board  201 , and one end of the side, which is laid out along the edge of the printed circuit board  201 , of the first antenna pattern  203  is connected to the second antenna pattern  204 , where the second antenna pattern  204  and the first antenna pattern  203  form a non-closed rectangular. The second antenna pattern  204  generates a high frequency band of the antenna radiation bandwidth by means of radiation, and a specific high frequency band may be 2 GHz to 3 GHz. A length of the second antenna pattern  204  may be set, and a width of a gap between the second antenna pattern  204  and the printed circuit board  201  may also be set. 
     The third antenna pattern  205  includes a first part  2051  and a second part  2052 , where one end of the first part  2051  is connected to the first antenna pattern  203 , and one end of the second part  2052  is connected to the second antenna pattern  204 , and the first part  2051  and the second part  2052  are arranged in parallel in the non-closed rectangle. By radiation of the second part  2052  and mutual coupling between the first part  2051  and the second part  2052 , the first part  2051  and the second part  2052 , which are alternately arranged in parallel, of the third antenna pattern  205  generate a high frequency band of the antenna radiation bandwidth, where specifically, the high frequency band may be 1.71 GHz to 2.17 GHz. A width, length, shape or quantity of the first part  2051  of the third antenna pattern  205  may be set to a fixed value, and a width, length, shape, or quantity of the second part  2052  of the third antenna pattern  205  may also be set to a fixed value. 
     In another embodiment of the present invention, the printed antenna further includes a welding device, where the welding device may include at least one of the following: an inductor, a capacitor, a resistor, or the like. One end of the first part  2051  of the third antenna pattern  205  is connected to the first antenna pattern  203  by using the welding device, and/or one end of the second part  2052  of the third antenna pattern  205  is connected to the second antenna pattern  204  by using the welding device. 
     In another embodiment of the present invention, the third antenna pattern  205  includes a first part  2051  and a second part  2052 . The first part  2051  of the third antenna pattern  205  includes at least two components, where the at least two components are connected by using the welding device, and the length of the first part  2051  of the third antenna pattern  205  may be adjusted by adding a welding device; and/or the second part  2052  of the third antenna pattern  205  includes at least two components, where the at least two components are connected by using the welding device, and the length of the second part  2052  of the third pattern  205  is adjusted by adding a welding device. 
       FIG. 3  is a Smith chart of a printed antenna measured in an embodiment of the present invention, where the Smith chart is a polar coordinate chart of a reflection factor (represented by the symbol Γ), and the reflection factor may be defined as a one-port scattering parameter, that is S11. In  FIG. 3 , the vertical coordinate is a reflection factor (S11), and the horizontal coordinate is a frequency. It can be seen from measured results in  FIG. 3  that, scattering curves at a low frequency band and high frequency band that are of an antenna and measured based on the printed antenna in this embodiment of the present invention converge, and all curves approach a center of the smith chart. Therefore, it indicates that a matching circuit does not need to be added to the printed antenna in this embodiment of the present invention, and an effect of impedance matching and the reflection factor being close to 1 can be achieved. 
     Table 1 is antenna efficiency actually measured in this embodiment of the present invention. Efficiency, which is measured based on this embodiment of the present invention, of an antenna at low frequency band and at high frequency band respectively can be seen in Table 1. 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                   
                 Efficiency 
               
               
                   
                 Frequency 
                 (%) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                   
                 698 
                 67.1 
               
               
                   
                 711 
                 73.5 
               
               
                   
                 731 
                 78.4 
               
               
                   
                 751 
                 76.4 
               
               
                   
                 771 
                 73.9 
               
               
                   
                 791 
                 74.0 
               
               
                   
                 810 
                 66.8 
               
               
                   
                 830 
                 62.9 
               
               
                   
                 850 
                 61.1 
               
               
                   
                 870 
                 58.1 
               
               
                   
                 890 
                 53.7 
               
               
                   
                 910 
                 47.6 
               
               
                   
                 930 
                 46.4 
               
               
                   
                 950 
                 34.7 
               
               
                   
                 960 
                 28.4 
               
               
                   
                 1710 
                 43.2 
               
               
                   
                 1730 
                 49.5 
               
               
                   
                 1750 
                 51.1 
               
               
                   
                 1770 
                 54.5 
               
               
                   
                 1790 
                 53.2 
               
               
                   
                 1810 
                 57.7 
               
               
                   
                 1830 
                 58.5 
               
               
                   
                 1850 
                 58.7 
               
               
                   
                 1870 
                 59.6 
               
               
                   
                 1890 
                 60.6 
               
               
                   
                 1910 
                 61.2 
               
               
                   
                 1930 
                 61.7 
               
               
                   
                 1950 
                 65.1 
               
               
                   
                 1970 
                 63.5 
               
               
                   
                 1990 
                 61.9 
               
               
                   
                 2010 
                 60.1 
               
               
                   
                 2030 
                 60.1 
               
               
                   
                 2050 
                 57.4 
               
               
                   
                 2070 
                 58.8 
               
               
                   
                 2090 
                 58.1 
               
               
                   
                 2110 
                 58.3 
               
               
                   
                 2130 
                 57.5 
               
               
                   
                 2150 
                 53.6 
               
               
                   
                 2170 
                 59.0 
               
               
                   
                 2190 
                 55.5 
               
               
                   
                 2300 
                 60.2 
               
               
                   
                 2350 
                 59.5 
               
               
                   
                 2400 
                 60.3 
               
               
                   
                 2450 
                 59.9 
               
               
                   
                 2500 
                 60.2 
               
               
                   
                 2520 
                 57.7 
               
               
                   
                 2540 
                 58.6 
               
               
                   
                 2560 
                 60.8 
               
               
                   
                 2580 
                 53.9 
               
               
                   
                 2600 
                 53.8 
               
               
                   
                 2620 
                 48.6 
               
               
                   
                 2640 
                 50.3 
               
               
                   
                 2660 
                 49.8 
               
               
                   
                 2680 
                 47.5 
               
               
                   
                 2690 
                 47.7 
               
               
                   
                 2700 
                 47.3 
               
               
                   
                   
               
            
           
         
       
     
     In Table 1, measured antenna efficiency at a low frequency band (698 MHz to 950 MHz) is higher than 35%, and measured antenna efficiency at a high frequency band (1.71 GHz to 2.7 GHz) is higher than 45%. 
     In this embodiment of the present invention, a printed antenna that can increase a bandwidth is designed. A first antenna pattern is connected to a second antenna pattern to form a non-closed rectangular, and a third antenna pattern is arranged in parallel in the non-closed rectangle, and is separately connected to the first antenna pattern and the second antenna pattern. The printed antenna can satisfy a requirement of a low frequency bandwidth of LTE communication (as low as 700 MHz), and efficiency of the printed antenna is effectively improved at a full frequency band. Further, the printed antenna may implement a coverage of an LTE full frequency band with no or few matching devices, which facilitates integration of the printed antenna in a terminal product, so as to satisfy a requirement of product miniaturization, and effectively reduce costs. 
       FIG. 4  is a schematic structural diagram of a printed antenna according to another embodiment of the present invention. As shown in  FIG. 4 , the printed antenna includes: a printed circuit board  401 , an antenna pattern, and a signal feed-in point  402 , where the antenna pattern is printed on a front surface of the printed circuit board  401 . 
     The antenna pattern includes: a first antenna pattern  403 , a second antenna pattern  404 , a third antenna pattern  405 , and a welding device  406 . 
     The signal feed-in point  402  is connected to the second antenna pattern  404 . 
     One end of a side, which is laid out along an edge of the printed circuit board  401 , of the first antenna pattern  403  is connected to the second antenna pattern  404 . 
     The second antenna pattern  404  is vertically laid out in parallel to an edge of the printed circuit board  401 , where the second antenna pattern  404  and the first antenna pattern  403  form a non-closed rectangular. 
     The third antenna pattern  405  includes a first part  4051  and a second part  4052 , where one end of the first part  4051  of the third antenna pattern  405  is connected to the first antenna pattern  403 , and one end of the second part  4052  of the third antenna pattern  405  is connected to the second antenna pattern  404 , and the first part  4051  and the second part  4052  are arranged in parallel in the non-closed rectangle. 
     The welding device  406  may include at least one of the following: an inductor, a capacitor, a resistor, or the like. One end of the first part  4051  of the third antenna pattern  405  is connected to the first antenna pattern  403  by using the welding device  406 , and/or one end of the second part  4052  of the third antenna pattern  405  is connected to the second antenna pattern  404  by using the welding device  406 . By using the welding device  406  to connect the first antenna pattern  403  to the first part  4051  of the third antenna pattern  405 , and to connect the second antenna pattern  404  to the second part  4052  of the third antenna pattern  405 , a connection position between the first antenna pattern  403  and the first part  4051  of the third antenna pattern  405  may be adjusted, and a connection position between the second antenna pattern  404  and the second part  4052  of the third antenna pattern  405  may also be adjusted, and a high-frequency resonance point of the printed antenna may be adjusted, so as to selectively increase radiation power of some resonance frequencies. 
     In this embodiment of the present invention, a printed antenna that can increase a bandwidth is designed. A first antenna pattern is connected to a second antenna pattern to form a non-closed rectangular, and a third antenna pattern is arranged in parallel in the non-closed rectangle, and is separately connected to the first antenna pattern and the second antenna pattern. The printed antenna can satisfy a requirement of a low frequency bandwidth of LTE communication (as low as 700 MHz), and efficiency of the printed antenna is effectively improved at a full frequency band. The antenna adjusts a length and a position of a first part and a second part of a third antenna pattern by using a welding device, and a high-frequency resonance point may be adjusted, so as to increase power of some frequencies. Further, the printed antenna may implement a coverage of an LTE full frequency band with no or few matching devices, which facilities integration of the printed antenna in a terminal product, so as to satisfy a requirement of product miniaturization, and effectively reduce costs. 
       FIG. 5  is a schematic structural diagram of a printed antenna according to still another embodiment of the present invention. As shown in  FIG. 5 , the printed antenna includes a printed circuit board  501 , an antenna pattern, and a signal feed-in point  502 , where the antenna pattern is printed on a front surface of the printed circuit board  501 . 
     The antenna pattern includes: a first antenna pattern  503 , a second antenna pattern  504 , a third antenna pattern  505 , and a welding device  506 . 
     The signal feed-in point  502  is connected to the second antenna pattern  504 . 
     One end of a side, which is laid out along an edge of the printed circuit board  501 , of the first antenna pattern  503  is connected to the second antenna pattern  504 . 
     The second antenna pattern  504  is vertically laid out in parallel to an edge of the printed circuit board  501 , where the second antenna pattern  504  and the first antenna pattern  503  form a non-closed rectangular. 
     The third antenna pattern  505  includes a first part  5051  and a second part  5052 , where one end of the first part  5051  of the third antenna pattern  505  is connected to the first antenna pattern  503 , and one end of the second part  5052  of the third antenna pattern  505  is connected to the second antenna pattern  504 , and the first part  5051  and the second part  5052  are arranged in parallel in the non-closed rectangle. 
     The welding device  506  may include at least one of the following: an inductor, a capacitor, a resistor, or the like. One end of the first part  5051  of the third antenna pattern  505  is connected to the first antenna pattern  503  by using the welding device  506 , and/or one end of the second part  5052  of the third antenna pattern  505  is connected to the second antenna pattern  504  by using the welding device  506 . 
     The first part  5051  of the third antenna pattern  505  includes a first component  50511  and a second component  50512 , where the first component  50511  of the first part  5051  of the third antenna pattern  505  may be connected to the second component  50512  of the first part  5051  by using the welding device  506 ; and/or the second part  5052  of the third antenna pattern  505  includes a first component  50521  and a second component  50522 , where the first component  50521  of the second part  5052  of the third antenna pattern  505  may be connected to the second component  50522  of the second part  5052  by using the welding device  506 . 
     Optionally, the first part  5051  of the third antenna pattern  505  includes at least two components, where the at least two components are connected by using the welding device  506 , so as to adjust a length of the first part  5051  of the third antenna pattern  505 . 
     Optionally, the second part  5052  of the third antenna pattern  505  includes at least two components, where the at least two components are connected by using the welding device  506 , so as to adjust a length of the second part  5052  of the third antenna pattern  505 . 
     By using the welding device  506  to connect the first antenna pattern  503  to the first part  5051  of the third antenna pattern  505 , to connect the second antenna pattern  504  to the second part  5052  of the third antenna pattern  505 , to connect the first component  50511  of the first part  5051  of the third antenna pattern  505  to the second component  50512 , and to connect the first component  50521  of the second part  5052  of the third antenna pattern  505  to the second component  50522 , a high-frequency resonance point of the printed antenna may be adjusted, so as to selectively increase radiation power of some resonance frequencies. 
     In this embodiment of the present invention, a printed antenna that can increase a bandwidth is designed. Three sides of a first antenna pattern and a second antenna pattern form a non-closed rectangular, and two parts of a third antenna pattern are alternately arranged in parallel, and are separately connected to the first antenna pattern and the second antenna pattern. The printed antenna can satisfy a requirement of a low frequency bandwidth of LTE communication (as low as 700 MHz), and efficiency of the printed antenna is effectively improved at a full frequency band. The antenna adjusts a position of a pattern, which is alternately arranged in parallel, of the third antenna pattern by using a welding device, and a high-frequency resonance point may be adjusted, so as to increase power of some frequencies. Further, the printed antenna may implement a coverage of an LTE full frequency band with no or few matching devices, which facilitates integration of the printed antenna in a terminal product, so as to satisfy a requirement of product miniaturization, and effectively reduce costs. 
       FIG. 6  is a schematic structural diagram of a terminal device according to an embodiment of the present invention. As shown in  FIG. 6 , the terminal device  60  includes: at least one printed antenna  601  and a communications module  602 . 
     The printed antenna  601  includes a printed circuit board, an antenna pattern, and a signal feed-in point, where the antenna pattern is printed on a front surface of the printed circuit board, and the antenna pattern includes a first antenna pattern, a second antenna pattern, and a third antenna pattern; the signal feed-in point is connected to the second antenna pattern; one end of a side, which is laid out along an edge of the printed circuit board, of the first antenna pattern is connected to the second antenna pattern; the second antenna pattern is vertically laid out in parallel to an edge of the printed circuit board, where the second antenna pattern and the first antenna form a non-closed rectangular; and the third antenna pattern includes a first part and a second part, where one end of the first part of the third antenna pattern is connected to the first antenna pattern, and one end of the second part of the third antenna pattern is connected to the second antenna pattern, and the first part and the second part are arranged in parallel in the non-closed rectangle. 
     The communications module  602  is configured to access a wireless network by using the printed antenna. 
       FIG. 7  is a schematic structural diagram of a terminal device according to another embodiment of the present invention. As shown in  FIG. 7 , in the another embodiment of the present invention, the terminal device includes at least two printed antennas, where a first printed antenna  6011  is a primary antenna of the terminal device  60 , and a second printed antenna  6012  is a secondary antenna of the terminal device  60 ; and the second printed antenna  6012  is a diversity antenna of the terminal device  60  and implements diversity reception of a signal together with the first printed antenna. 
     The terminal device  60  may include at least one of the following: a data card, a wireless network interface card, a modem, a mobile phone, a portable computer that has a function of surfing the Internet, or a device that can perform wireless communication. In addition, the printed antenna  601  may also be configured to implement functions such as Bluetooth, WIFI (Wireless Fidelity), GPS (Global Positioning System). 
     In this embodiment of the present invention, a printed antenna that can increase a bandwidth is designed. A first antenna pattern is connected to a second antenna pattern to form a non-closed rectangular, and a third antenna pattern is arranged in parallel in the non-closed rectangle, and is separately connected to the first antenna pattern and the second antenna pattern. The printed antenna can satisfy a requirement of a low frequency bandwidth of LTE communication (as low as 700 MHz), and efficiency of the printed antenna is effectively improved at a full frequency band. The antenna adjusts a position of a pattern, which is alternately arranged in parallel, of the third antenna pattern by using a welding device, and a high-frequency resonance point may be adjusted, so as to increase power of some frequencies. Further, the printed antenna may implement a coverage of an LTE full frequency band with no or few matching devices, which facilitates integration of the printed antenna in a terminal product, so as to satisfy a requirement of product miniaturization, and effectively reduce costs. 
     A person of ordinary skill in the art may be aware that, in combination with the examples described in the embodiments disclosed in this specification, units and algorithm steps may be implemented by a combination of computer software and electronic hardware. Whether the functions are performed by hardware or software depends on particular applications and design constraint conditions of the technical solutions. A person skilled in the art may use different methods to implement the described functions for each particular application, but it should not be considered that the implementation goes beyond the scope of the present invention. 
     It may be clearly understood by a person skilled in the art that, for the purpose of convenient and brief description, for a detailed working process of the foregoing apparatus and unit, reference may be made to a corresponding process in the foregoing method embodiments, and details are not described herein again. 
     In the several embodiments provided in the present application, it should be understood that the disclosed server and method may be implemented in other manners. For example, the described server embodiment is merely exemplary. For example, the unit division is merely logical function division and may be other division in an actual implementation. For example, a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not performed. Furthermore, the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented through some interfaces. The indirect couplings or communication connections between the apparatuses or units may be implemented in electronic, mechanical, or other forms. 
     The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of network units. A part or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments of the present invention. 
     In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units are integrated into one unit. 
     A person of ordinary skill in the art may understand that all or a part of the steps of the method embodiments may be implemented by a program instructing relevant hardware. The program may be stored in a computer readable storage medium. When the program runs, the steps of the method embodiments are performed. The foregoing storage medium includes any medium that can store program code, such as a ROM, a RAM, a magnetic disk, or an optical disc. 
     The foregoing descriptions are merely specific implementations of the present invention, but are not intended to limit the protection scope of the present invention. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in the present invention shall fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.