WIRELESS COMMUNICATION DEVICE WITH HIGH-GAIN BUILT-IN ANTENNA

1. Technical Field

The disclosure generally relates to wireless communication devices, and particularly to a wireless communication device having a built-in antenna.

2. Description of Related Art

To obtain a simple and aesthetic appearance, a wireless communication device such as a mobile phone commonly includes a built-in antenna replacing an external antenna. However, a signal receiving and transmitting gain of the built-in antenna is relative low, and may lead to instability in receiving and transmitting signals so that the mobile phone may easily disconnect from a network.

In addition, due to restrictions of limited space inside the mobile phone, dimensions of the built-in antenna positioned in the mobile phone are also limited which may also restrict a signal receiving and transmitting ability of the mobile phone.

Therefore, there is room for improvement within the art.

FIG. 1 is an exploded view of a wireless communication device 100, according to an exemplary embodiment of the disclosure. The wireless communication device 100 can be a mobile phone or a personal digital assistant (PDA) or the like. In this exemplary embodiment, the wireless communication device 100 is a mobile phone. The wireless communication device 100 includes a main board 11, a display module 13, and a coil 15.

The main board 11 includes a feed point 111 configured to feed radio frequency signals and a ground point 113 providing ground for the wireless communication device 100. The main board 11 also includes a plurality of elements 115 (schematically shown) such as cameras, keys, and speakers of the wireless communication device 100.

The display module 13 includes a display 131 and a protective panel 133. The protective panel 133 is transparent and may be made of glass. The protective panel 133 is positioned above the display 131 to protect the display 131 from scratches and damage to increase service life of the display 131.

The coil 15 is formed by a metal wire having good conduction performance and includes a plurality of substantially rectangular wire loops 151 wound together. The coil 15 is positioned between the display 131 and the protective panel 133 and serves as a built-in antenna for the wireless communication device 100. The coil 15 includes two connecting terminals 151, one connected to the feed point 111 and the other connected to the ground point 113 and serving as a feed end and a ground end respectively for the built-in antenna.

By changing the number of coils of the coil 15 (i.e. a length of the coil 15) the signal sending/receiving performance of the coil 15 can be adjusted according to various design requirements.

In addition, because the protective panel 133 is transparent, the coil 15 can be designed in color and with style to decorate the protective panel 133. The coil 15 can have an extra decoration function in addition to receiving and transmitting signals as the built-in antenna.

Moreover, because the coil 15 is positioned between the display 131 and the protective panel 133, the coil 15 can be apart from the elements 115 to avoid electromagnetic interference from the elements 115. In one embodiment, shortest distance between the coil 15 and the elements 115 is larger than six millimeters.

In one embodiment, the coil 15 can be directly coiled around a side wall of the display 131 so that the wireless communication device 100 can be further miniaturized.

The wireless communication device 100 using a coiled metal wire as the built-in antenna has a simple structure. The built-in antenna can have large dimensions to ensure a better signal receiving and transmitting ability without occupying any space inside the wireless communication 100.

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.