Patent Application
20140375507
The exemplary disclosure generally relates to antennas, and particularly to a broadband antenna and a wireless communication device employing the same.
With improvements in the integration of wireless communication systems, broadband antennas have become increasingly important. For a wireless communication device to utilize various frequency bandwidths, antennas having wider bandwidths have become a significant technology.
Many aspects of the exemplary embodiments can be better understood with reference to 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.
The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to “an” or “one” exemplary embodiment in this disclosure are not necessarily to the same exemplary embodiment, and such references mean “at least one.” The references “a plurality of” and “a number of” mean “at least two.”
In the following disclosure the term “coupled” is defined as connected, whether directly or indirectly by intervening components, and is not necessarily limited to physical connections. The connection can be such that the objects are permanently connected or releasably connected.
The broadband antenna 10 includes a low band radiating unit 11, a first feeding portion 12, a high band radiating unit 13, a second feeding portion 14, a resonating unit 15, and a grounding portion 16. The low band radiating unit 11 is positioned at and spaced apart from a first edge of the USB connector 70, and the high band radiating unit 13 is positioned at and spaced apart from a second edge of the USB connector 70. Thus, a radiating performance of the broadband antenna 10 can be prevented from interference by the USB connector 70.
The low band radiating unit 11 is a meandering monopole antenna, and includes a first radiator 111, a second radiator 112, a third radiator 113, a fourth radiator 114, a fifth radiator 117, a first connecting strip 115, and three second connecting strips 116. The first, second, third and fourth radiators 111, 112, 113 and 114 are substantially coplanar with each other, and are connected in sequence by the three second connecting strips 116. In the illustrated exemplary embodiment, each of the first, second, third, and fourth radiators 111, 112, 113, and 114 is a substantially U-shaped strips. The second radiator 112 has a substantially same shape and size as the third radiator 113. The fifth radiator 117, the first connecting strip 115, and the three second connecting strips 116 are positioned in a plane that is substantially perpendicular to a plane in which the first, second, third, and fourth radiators 111, 112, 113, and 114 are positioned. The fifth radiator 117 substantially perpendicularly extends from a distal end of the fourth radiator 114. The first connecting strip 115 is substantially a rectangular strip, and is connected between a distal end of the first radiator 111 and the first feeding portion 12. The three second connecting strips 116 are substantially collinear with each other.
In one exemplary embodiment, distances between the first radiator 111 and the second radiator 112, the second radiator 112 and the third radiator 113, and the third radiator 113 and the fourth radiator 114 are about 1 millimeter (mm). Each of the first, second, third, and fourth radiators 111, 112, 113, and 114 includes two substantially parallel arms. In an exemplary embodiment, a distance between the two parallel arms of the first radiator 111 is about 3.9 mm, a distance between the two parallel arms of the second radiator 112 is about 1 mm, a distance between the two parallel arms of the third radiator 113 is about 1 mm, and a distance between the two parallel arms of the fourth radiator 114 is about 3.4 mm. In an exemplary embodiment, a length of the two parallel arms of each of the first, second, third, and fourth radiators 111, 112, 113, and 114 is about 8 mm.
The first feeding portion 12 is a substantially rectangular strip that substantially perpendicularly extends from an end of the first connecting strip 115 of the low band radiating unit 11. The first feeding portion 12 is positioned in a plane that is substantially parallel to a plane in which the first, second, third, and fourth radiators 111, 112, 113, and 114 are positioned. The first feeding portion 12 is coupled to the PCB 60 via a first conventional impedance matching circuit (not shown).
The high band radiating unit 13 is a monopole antenna and includes a first radiating portion 131, a second radiating portion 132, and a third radiating portion 133. The first radiating portion 131 is a substantially right trapezoidal strip. The first radiating portion 131 includes a first edge 1311, a second edge 1312, and a third edge 1313. The second edge 1312 is substantially parallel to and longer than the first edge 1311, and the third edge 1313 is substantially perpendicularly connected between the first edge 1311 and the second edge 1312. In one exemplary embodiment, a length of the first edge 1311 is about 1.2 mm, and a length of the second edge 1312 is about 4.2 mm. The second radiating portion 132 is substantially a right trapezoidal strip that extends substantially perpendicularly from the third edge 1313 of the first radiating portion 131. The third radiating portion 133 is a substantially rectangular strip connected to an end of the second radiating portion 132 opposite to the first radiating portion 131. In one exemplary embodiment, a length of a first edge of the second radiating portion 132 connected to the first radiating portion 131 is about 5.2 mm, and a length of a second edge of the second radiating portion 132 connected to the third radiating portion 133 is about 1.2 mm.
The second feeding portion 14 is a substantially rectangular strip that substantially perpendicularly extends from a fourth edge (not labeled) of the first radiating portion 131 opposite to the third edge 1313. The second feeding portion 14 is positioned in a plane that is substantially perpendicular to a plane in which the first radiating portion 131 is positioned. The second feeding portion 14 is coupled to the PCB 60 via a second conventional impedance matching circuit (not shown).
The resonating unit 15 is spaced apart from and partially surrounds the high band resonating unit 13. The resonating unit 15 includes a first resonating arm 151, a second resonating arm 152, a third resonating arm 153, and a fourth resonating arm 154. The first resonating arm 151 is a substantially rectangular strip and substantially parallel to and spaced from the second edge 1312 of the first resonating arm 131. The first resonating arm 151 is substantially coplanar with the first radiating portion 131. The first resonating arm 151 is substantially parallel to and spaced apart from the second edge 1312 of the first radiating portion 131. The second, third, and fourth resonating arms 152, 153, and 154 are substantially coplanar with the second and third radiating portions 132 and 133, and cooperatively define a receiving space (not labeled). The third resonating arm 153 is substantially parallel to and spaced apart from the third radiating portion 133. The second and third radiating portions 132 and 133 are received in the receiving space. In one exemplary embodiment, a distance between the first resonating arm 151 and the second edge 1312 of the first radiating portion 131 is about 1.9 mm, a distance between the third resonating arm 153 and the third radiating portion 133 is about 1 mm, and a total length of the second, third, and fourth resonating arms 152, 153, and 154 is about 33.5 mm.
The grounding portion 16 is a substantially rectangular strip and substantially coplanar with and substantially parallel to the second feeding portion 14. The grounding portion 16 substantially perpendicularly extends from an end of the first resonating arm 151 opposite to the second resonating arm 152. The grounding portion 16 is coupled to the PCB 60 and grounded via the PCB 60.
In use, a first current path is established in the low band radiating unit 11 to generate a low band frequency to receive/send wireless signals from about 700 megahertz (MHz) to about 960 MHz. A second current path is established in the high band radiating unit 13 to generate a first high band frequency. A third current path is established in the resonating unit 15 to generate a second high band frequency. In addition, the resonating unit 15 resonates with the high band radiating unit 13 to cooperatively generate a third high band frequency, such that the broadband antenna 10 can receive/send high-frequency wireless signals from about 1400 MHz to about 3000 MHz. Accordingly, the wireless communication device 100 employing the broadband antenna 10 can be used in common wireless communication systems, such as LTE Band 13/17 (700 MHz), GSM (850/900 MHz), GSM (1800-1900 MHz), WCDMA (2100 MHz), LTE Band 1 (2100 MHz), and LTE Band 7 (2600 MHz), with exceptional communication quality.
It is believed that the exemplary embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the disclosure or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102121645 | Jun 2013 | TW | national |
