Patent Publication Number: US-8981999-B2

Title: Broadband antenna element

Description:
BACKGROUND 
     1. Technical Field 
     The present disclosure relates to broadband antenna elements. 
     2. Description of the Related Art 
     A remote communication apparatus integrates various communicating modes, such as GSM, WCDMA, and LTE, to expand the available modes of communication, which results in increasing the broadband of an antenna of the apparatus. However, the broadband antenna of related art has limits which can not be expanded easily. 
     Therefore, there is room for improvement within the art. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
         FIG. 1  is a partially sectioned schematic view of a broadband antenna element, according to an exemplary embodiment. 
         FIG. 2  is a partially sectioned schematic view of the broadband antenna element of  FIG. 1 , but viewed from another aspect. 
         FIG. 3  is an exemplary return loss waveform of the broadband antenna element. 
         FIG. 4  is a partially sectioned schematic view of the broadband antenna element, according to another exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Referring to  FIGS. 1 and 2 , a broadband antenna element  1  includes a broadband antenna  10 , an antenna carrier  20  and a circuit board  30 . The broadband antenna  10  is mounted on the antenna carrier  20 . The circuit board  30  includes a first region  31  electrically connected to the broadband antenna  10 , a second region  32  is grounded. The first region  31  and the second region  32  are on the same plane. 
     The antenna carrier  20  includes a first plate portion  21  and a second plate portion  22 . The first plate portion  21  is substantially parallel with the circuit board  30 , and the second plate portion  22  is substantially perpendicular to the circuit board  30  and connected to the edge of the first region  31 . The broadband antenna  10  includes a first antenna  11  and a second antenna  12 . The first antenna  11  and the second antenna  12  are both conductive, formed by bending metal strips. Each of the first antenna  11  and the second antenna  12  includes a connecting terminal and a feed terminal. 
     The first antenna  11  includes a first feed terminal  110  and a second feed terminal  111 . The first feed terminal  110  is mounted on the second plate portion  22 , and the second feed terminal  111  is mounted in the first region  31  with an end connected to the first feed terminal  110  and the other end connected to the second region  32 . The second antenna  12  includes a third feed terminal  120 , a fourth feed terminal  121 , and a coupling ground terminal  122 . The third feed terminal  120  is mounted on the first plate portion  21 . In the embodiment, the third feed terminal  120  is mounted on an edge where the first plate portion  21  adjoins the second plate portion  22 . The fourth feed terminal  121  is mounted on the second plate portion  22  at a first predetermined distance from the first feed terminal  110 . The coupling ground terminal  122  is mounted on the first region  31 . The fourth feed terminal  121  is connected between the third feed terminal  120  and an end of the coupling ground terminal  122 . The other end of the coupling ground terminal  122  is connected to the second region  32  at a second predetermined distance from the second feed terminal  111 . In the embodiment, the coupling ground terminal  122  is substantially parallel to the second feed terminal  111 , and the fourth feed terminal  121  is substantially parallel to the first feed terminal  110  and perpendicular to both the second feed terminal  111  and to the coupling ground terminal  122 , which results in the first predetermined distance being substantially equal to the second predetermined distance. Thereby, a first low impedance of the broadband antenna  10  is generated in the second predetermined distance, a second low impedance of the broadband antenna  10  is generated on the distal terminal of the first feed terminal  110 , and a high impedance of the broadband antenna  10  is generated in the first predetermined distance. Each of the first predetermined distance and the second predetermined distance can be adjusted to change the impedance of the broadband antenna  10  accordingly (as shown in  FIG. 3 ). 
     Referring to  FIG. 4 , in an alternative embodiment, the first feed terminal  110  and the second feed terminal  111  are mounted on the first region  31 . The first feed terminal  110  is mounted on an edge of the first region  31  and perpendicular to the second feed terminal  111 , thus the first antenna  11  is “L” shaped. The third feed terminal  120  is mounted on the second plate portion  22 , and the fourth feed terminal  121  and the coupling ground terminal  122  are mounted on the first region  31 . The fourth feed terminal  121  is mounted on an edge of the first region  31  and perpendicular to the coupling ground terminal  122 , thus the second antenna  12  is also “L” shaped. The fourth feed terminal  121  is connected between the third feed terminal  120  and the coupling ground terminal  122 . The second feed terminal  111  maintains the predetermined distance from the coupling ground terminal  122 . In the embodiment, the second feed terminal  111  is substantially parallel to the coupling ground terminal  122 . 
     In the embodiment, the first feed terminal  110 , the second feed terminal  111 , the fourth feed terminal  121 , and the coupling ground terminal  122  are formed in the first region  31  of the circuit board  30  using an etching process. In the embodiment, a circuit module  40  is electronically connected to the fourth feed terminal  121 , which is configured for processing wireless signals received/transmitted by the third feed terminal  120 . 
     The present disclosure may be embodied in other forms without departing from the spirit thereof. The present examples and embodiments are to be considered in all respects as illustrative and not restrictive, and the disclosure is not to be limited to the details given herein.