Antenna module and communication device having the same

An antenna module includes a first antenna and a second antenna which work at the same frequency. The first antenna includes a first feed portion, a first radiation portion, and a first ground portion. The second antenna includes a second feed portion and a second radiation portion. The first radiation portion is arc-shaped. The second radiation portion includes an arced edge and is coupled to the first radiation portion via the arced edge. The first feed portion and the second feed portion are connected to a signal terminal of a printed circuit board of a communication device and configured for feeding in electromagnetic waves. The ground portion is connected to a ground of the printed circuit board.

BACKGROUND

1. Technical Field

The present disclosure relates to an antenna module and a communication device using the antenna module.

2. Description of Related Art

Current communication devices often come with more than one wireless transmission system, such as a WI-FI system and a BLUETOOTH system, each of which employs a corresponding internal printed antenna. The areas of the inner printed antennas are limited because of the miniaturization of the communication device, adversely affecting the performance of the antennas.

Therefore, it is desirable to provide an antenna module and a communication device having the same, which can overcome the above-mentioned limitations.

DETAILED DESCRIPTION

Referring toFIG. 1, an antenna module100, according to an embodiment, is printed on a shell300of a communication device200. In addition to the shell300, the communication device200also includes a printed circuit board (PCB, not shown) received in the shell300. A lower portion of the shell300defines a battery groove310for receiving a battery (not shown) of the communication device200. An upper portion of the shell300defines a through hole320, generally at the center thereof, for receiving a camera module (not shown) of the communication device200. The upper portion of the shell300also defines a first slot332and a second slot334. The first slot332is positioned at a side of the through hole320opposite to the battery groove310. The second slot334is generally positioned at a middle portion between the first slot332and a right edge of the shell300. In this embodiment, the communication device200is a mobile phone.

The antenna module100includes a first antenna10and a second antenna20, which are positioned between the through hole320and the right edge of the shell300. The first antenna10includes a first feed portion12, a first radiation portion14, and a ground portion16. The second antenna20includes a second feed portion22and a second radiation portion24.

The first radiation portion14is an arc-shaped sheet, fittingly surrounding the through hole320. The second radiation portion24is positioned at a side, e.g., the left side, of the first radiation portion14. The second radiation portion24includes an arced edge242and is coupled to the first radiation portion14by the arced edge242. As such, the second radiation portion24can function as a direction guiding element of the first radiation portion14and helps guide the direction of electromagnetic waves radiated from the first radiation portion14such that the first radiation portion14can efficiently radiate the electromagnetic waves. The first radiation portion14can function as a reflective element of the second radiation portion24to reflect electromagnetic waves radiated from the second radiation portion24so that the radiation effect of the second radiation portion24is enhanced.

The first radiation portion14forms an arc that subtends an angle of about 2π/3 (e.g., 130°) and includes a first section142that is adjacent to the battery groove310, a second section144that extends from the first section142to the second slot334, and a third section146that extends from the second section144to the first slot332. The first section142, the second section144, and the third section146form arcs that subtend angle of about π/9 (e.g., 23°), π/4 (e.g., 45°), and π/3 (e.g., 62°), respectively. The width of the first section142is slightly smaller than those of the second section144and the third section146. The arced edge242forms an arc that subtends an angle generally equal to that of the second section144and aligned with the second section144. The second radiation portion24extends from the arced edge242to the right edge of the shell300and is generally rectangular.

The first feed portion12extends from the first radiation portion14, the second feed portion22extends from the second radiation portion24, and the first feed portion12and the second feed portion22are connected to a signal terminal of the PCB of the communication device200and configured for feeding in electromagnetic waves. In particular, the first feed portion12is a rectangular strip extending from the third section146into the first slot332, and the second feed portion22is a rectangular strip extending from the second radiation portion24into the second slot334.

The ground portion16extends from the first radiation portion14and is configured for connecting the first radiation portion14to the ground of the PCB of the communication device200.

In this embodiment, the first antenna10is a BLUETOOTH compliant antenna, working at about 2.4 GHz. As illustrated inFIG. 2, around 2.4 GHz, the return loss of the first antenna10is less than −10 dB, satisfying the corresponding industrial standard. In addition, the return loss of the first antenna10can approach about −10.7 dB when working at about 2.445 GHz.

The second antenna20is a WI-FI compliant antenna, also working at about 2.4 GHz. As illustrated inFIG. 3, around 2.4 GHz, the return loss of the second antenna20is less than −7 dB, satisfying the respective industrial standard. In addition, the return loss of the second antenna20can approach about −7.3 dB when working at about 2.45 GHz.