Abstract: A chip card holder for holding at least one chip card, includes a base, a drawer and a arm. The drawer is slidably attached to the base. The drawer defines a receiving space and a receiving groove communicating with the receiving space. The arm is rotatably attached in the receiving groove. When only one chip card is received in the receiving space, the arm rotates relative to the drawer until the arm is pressed on the chip card so the chip card is held in the receiving space by the arm; when two chip cards are stacked in the receiving space, the arm is attached in the receiving groove to prevent said two chip cards from sliding out of the receiving space through the receiving groove.

Abstract: The invention provides a method for antenna diversity. The method comprises: using a first antenna to receive a signal, recording a first average signal intensity of the signal within a checking time, comparing the first average signal intensity with a threshold signal intensity, and recording a next first average signal intensity if the current first average signal intensity is stronger than the threshold signal intensity, otherwise switching to a second antenna to receive the signal and recording a second average signal intensity within the checking time. The method further comprises the following steps if the first antenna switches to the second antenna: comparing the first average signal intensity to the second signal intensity, and recording the next second average signal intensity within the checking time if the second average signal intensity is greater than the first average signal intensity, otherwise switching back to the first antenna to receive the signal.

Abstract: The invention provides a method for antenna diversity. The method comprises: using a first antenna to receive a signal, recording a first average signal intensity of the signal within a checking time, comparing the first average signal intensity with a threshold signal intensity, and recording a next first average signal intensity if the current first average signal intensity is stronger than the threshold signal intensity, otherwise switching to a second antenna to receive the signal and recording a second average signal intensity within the checking time. The method further comprises the following steps if the first antenna switches to the second antenna: comparing the first average signal intensity to the second signal intensity, and recording the next second average signal intensity within the checking time if the second average signal intensity is greater than the first average signal intensity, otherwise switching back to the first antenna to receive the signal.