Mobile device and tunable antenna therein

摘要

A mobile device includes an antenna, an ESD (Electrostatic Discharge) protection component, a plurality of branches, and a switch. The antenna is configured to transmit and receive an RF (Radio Frequency) signal. The branches provide different inductances or different capacitances, and are respectively coupled to a ground voltage terminal. The switch is coupled through the ESD protection component to the antenna, and switches between the branches according to a control signal such that the antenna is capable of operating in a plurality of frequency intervals. The ESD protection component is configured to protect the switch from being damaged.

主权项

1. A mobile device, comprising:
an antenna, transmitting and receiving an RF (Radio Frequency) signal; an ESD (Electrostatic discharge) protection component; a plurality of branches, providing different inductances or capacitances, and respectively coupled to a ground voltage terminal; and a switch, coupled through the ESD protection component to the antenna, and switching between the branches according to a control signal such that the antenna is capable of operating in a plurality of frequency intervals, wherein the ESD protection component is configured to protect the switch from being damaged, wherein the mobile device further comprises: a processor, coupled to the switch and the antenna, and performing a selection procedure to generate the control signal, and wherein the selection procedure comprises the steps of: obtaining, by the antenna, a signal indicator of the RF signal; determining, by the processor, whether the signal indicator is greater than or equal to a first threshold value; if not, performing a scan procedure to cause the antenna to operate in all of the frequency intervals one after another; during the scan procedure, monitoring, by the processor, the signal indicator to search for a maximum value of the signal indicator; and controlling the antenna to operate in a target frequency interval corresponding to the maximum value of the signal indicator.