Wearable wireless electronic device

A wearable wireless electronic device includes a watch dial and a hand module. The hand module includes a first hand and a second hand that are rotatably coupled to the watch dial. The first and second hands are configured to indicate current time and send/receive wireless signals. When the first and second hands rotate relative to the watch dial, the first and second hands are configured to display current time. When the first hand is positioned at a predetermined position substantially perpendicular to the second hand, the first and second hands are configured to send/receive wireless signals.

FIELD

The subject matter herein generally relates to wearable devices, and particularly to a wearable wireless electronic device having an antenna.

BACKGROUND

As wireless communication technology develops, most portable electronic devices have wireless communication function. The wireless communication needs a physical antenna to be the medium for transmitting or receiving signals. The antenna will cause an increase in volume, when the volume of the electronic device such as an electronic device worn on a wrist is small, it is difficult to keep the device with small and exquisite appearance.

DETAILED DESCRIPTION

FIG. 1illustrates an isometric view of one embodiment of a wearable wireless electronic device100having time indication and wireless communication functions. The wireless electronic device100includes a main body10and a strap30coupled to two ends of the main body10. The strap30is configured to be worn on a wrist of a user. The main body10includes a casing11, a watch dial12, a touch screen14and a hand module13. The watch dial12and the touch screen14are received in the casing11side by side.

The hand module13is configured to either indicate current time or serve as an antenna. The hand module13includes a first hand131, a second hand132, a first spindle133and a second spindle134. The first and second hands131,132are hour hand and minute hand, respectively. The first spindle133is coupled to the first hand131. The second spindle134is coupled to the second hand132. The first and second spindles133,134are configured to drive the first and second hands131,132to rotate, respectively, thereby displaying current time, and further configured to feed current signals to the first and second hands131,132respectively. When the first and second hands131,132rotate relative to the watch dial12, the first and second hands131,132display current time. When the first and second hands131,132are motionless at a predetermined position, the first and second hands131,132serve as an antenna to send/receive wireless signals. In at least one embodiment, when the first and second hands131,132serve as the antenna, the first hand131is substantially perpendicular to the second hand132. For example, when the first and second hands131and132serve as the antenna, the first and second hands131and132can be positioned at the three o'clock position as shown inFIG. 1.

The touch screen14is configured to indicate current time when the hand module13serve as the antenna, and further configured to select the function of the hand module13in response to a touch of a user.

FIG. 2illustrates a block diagram of the wearable wireless electronic device100as shown inFIG. 1. The wearable wireless electronic device100is further provided with a controlling module15, a radio frequency circuit16, and an impedance matching circuit17. The controlling module15is electronically coupled to the touch screen14, and is configured to control operations of the first and second hands131,132in response to commands input from the touch screen14by a user. In particular, when the controlling module15receives a first command from the touch screen14, the controlling module15controls the first and second spindles133and134to drive the first and second hands131,132to the predetermined position, and controls the first and second hands131,132to remain motionless for a period of time to serve as an antenna to send/receive wireless signal. Alternatively, when the controlling module15receives a second command from the touch screen14during the first and second hands131,132serve as the antenna, the controlling module15controls the first and second hands131,132to move to a position in which the first and second hands131,132indicate the current time, and further controls the first and second hands131,132to rotate to keep indicating the current time.

The radio frequency circuit16is electronically coupled to the first and second hands131,132through the impedance matching circuit17. In particular, the impedance matching circuit17includes a capacitor C1and an inductor L1. The radio frequency circuit16is grounded via the capacitor C1and the inductor L1, a node between the capacitor C1and the inductor L1is electronically coupled to the first and second spindles133,134. Accordingly, the radio frequency circuit16can feed current signals to the first and second hands131,132through the impedance matching circuit17and the first and second spindles133,134, to drive the first and second hands131,132to send/receive wireless signals. The capacitor C1with appropriate capacitance and the inductor L1with appropriate inductance can ensure the hand module13resonates at a desired frequency band. In at least one embodiment, the capacitance value of the capacitor C1is about 700 pF; the inductance value of the inductor L1is about 1.5 nH. The first hand131is configured to receive/send wireless signal at a first frequency band from about 5200 MHz to about 5800 MHz (WiFi); the second hand132is configured to send/receive wireless signal at a second frequency band from about 2400 MHz to about 2484 MHz (Bluetooth).

FIG. 3illustrates a diagram showing return loss (“RL”) measurements of the hand module13as shown inFIG. 1. It can be derived fromFIG. 3that RL is lower than −5 dB when the hand module13operates at the first frequency band from about 5200 MHz to about 5800 MHz, and the second frequency band from about 2400 MHz to about 2484 MHz.

FIG. 4illustrates a diagram showing transmission efficiency measurements of the hand module13as shown inFIG. 1. A transmission efficiency of the hand module13at the first frequency band from about 5200 MHz to about 5800 MHz is in a range from about 60% to about 82%, and the transmission efficiency of the hand module13at the second frequency band from about 2400 MHz to about 2484 MHz is in a range from about 40% to about 50%. Thus, the hand module13can be utilized in WiFi and Bluetooth communication system with an exceptional communication quality

In summary, the wearable wireless electronic device100utilizes the first and second hands131,132to serve as antenna to send/receive wireless signals, thus there is no need to distribute additional volume to the antenna, and a small and exquisite appearance of the wearable wireless electronic device100can be achieved.