Patent Publication Number: US-2013249738-A1

Title: Multi-band antenna

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a multi-band antenna, and more particularly to a multi-band antenna capable of conforming to the miniaturization trend of electronic products. 
     2. The Related Art 
     With the fast development of mobile communication technology, people put forward more and more requirements on portable mobile communication equipments, such as mobile phones and notebooks, especially in miniaturization volume of the portable mobile communication equipments. With the volume of the portable mobile communication equipment becoming smaller and smaller, the size of an antenna placed in the equipment should be accordingly decreased. In order to both conform to the miniaturization trend of the portable mobile communication equipment and ensure the effective performance of the antenna, it is necessary to provide a kind of rational layout of multi-band antenna. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a multi-band antenna disposed on a circuit board. The multi-band antenna includes a feeding portion of a substantially rectangular slice shape located on a left side of the circuit board and adjacent to a front edge of the circuit board. A base slice is located on the left side of the circuit board and connected with a rear end of the feeding portion. A high frequency radiating portion is located on the left side of the circuit board and connected with a left end of the base slice. The high frequency radiating portion is further adjacent to a left edge and a rear edge of the circuit board. A low frequency radiating portion is connected with a rear end of the base slice and zigzag meanders opposite to the high frequency radiating portion along the rear edge of the circuit board. A free arm of the low frequency radiating portion is adjacent to a right edge of the circuit board. A mid-frequency radiating portion is connected with the rear end of the base slice and then straightly extends towards the right edge of the circuit board. 
     As described above, the multi-band antenna utilizes the rational layout of the high frequency radiating portion, the low frequency radiating portion and the mid-frequency radiating portion on the circuit board to receive and transmit communication signals of different frequency bands of 2300-2700 MHZ, 791-960 MHZ, and 1710-2170 MHZ. So the multi-band antenna is capable of conforming to the miniaturization trend of electronic products and further ensures the effective performance thereof. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention will be apparent to those skilled in the art by reading the following description, with reference to the attached drawing, in which: 
       The FIGURE is a vertical view of a multi-band antenna in accordance with an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to the FIGURE, a multi-band antenna according to an embodiment of the present invention is shown. The multi-band antenna is disposed on a circuit board  60  and includes a feeding portion  10 , a base slice  20 , a high frequency radiating portion  30 , a low frequency radiating portion  40  and a mid-frequency radiating portion  50 . 
     Referring to the FIGURE, the feeding portion  10  of a substantially rectangular slice shape is located on a left side of the circuit board  60  and is further adjacent to a front edge of the circuit board  60 . The base slice  20  is located on the left side of the circuit board  60  and connected with a rear end of the feeding portion  10 . 
     The high frequency radiating portion  30  is located on the left side of the circuit board  60  and includes a connecting part  31  and a L-shaped radiating part  32 . The connecting part  31  is connected with a left end of the base slice  20 . A long arm  321  of the radiating part  32  is connected with a rear side of the connecting part  31  and is located adjacent to a left edge of the circuit board  60 . A short arm  322  of the radiating part  32  extends opposite to the left edge of the circuit board  60  and is further adjacent to a rear edge of the circuit board  60 . 
     The low frequency radiating portion  40  is connected with a rear end of the base slice  20  and zigzag meanders opposite to the high frequency radiating portion  30  along the rear edge of the circuit board  60 . In this embodiment, the low frequency radiating portion  40  meanders substantially like a plurality of series-connected zigzags and has a variable amplitude and density in process of meandering according to different radiating frequencies. A free arm of the low frequency radiating portion  40  is adjacent to a right edge of the circuit board  60 . 
     The mid-frequency radiating portion  50  is connected with the rear end of the base slice  20  and then straightly extends towards the right edge of the circuit board  60  to be located closely in front of the low frequency radiating portion  40 . 
     As described above, the multi-band antenna utilizes the rational layout of the high frequency radiating portion  30 , the low frequency radiating portion  40  and the mid-frequency radiating portion  50  on the circuit board  60  to receive and transmit communication signals of different frequency bands of 2300-2700 MHZ, 791-960 MHZ, and 1710-2170 MHZ. So the multi-band antenna is capable of conforming to the miniaturization trend of electronic products and further ensures the effective performance thereof.