Tunable antenna and Related Radio-Frequency Device

A radio-frequency (RF) device for a wireless communication device, the RF device comprising:

• a tunable antenna comprising:
• a ground element for providing grounding;
• a signal feed-in terminal;
• a radiation unit electrically connected to the signal feed-in terminal and including along side extended from the signal feed-in terminal toward a first direction, a short side extended from the signal feed-in terminal toward a second direction and a branch electrically connected between the signal feed-in terminal and the ground element;
• a coupling unit for coupling to the long side;
• and
• a switch unit for connecting or disconnecting the coupling unit and the ground element to change a coupling relationship between the coupling unit and the long side;
• an RF signal process module for processing an RF signal transmitted and received by the tunable antenna, and outputting a control signal according to the RF signal;
• and
• a control unit coupled between the RF signal process module and the switch unit for controlling the switch unit to adjust a connection between the coupling unit and the ground element according to the control signal, such that the tunable antenna respectively operates in a first frequency band and a second frequency band.

A tunable antenna comprising:

• a ground element for providing grounding;
• a signal feed-in terminal;
• a coupling unit electrically connected to the signal feed-in terminal for feeding the tunable antenna through coupling;
• a radiation unit comprising:
• a long side extended along a first direction;
• and
• at least one short side electrically connected to the long side and extended along a second direction;
• and
• a switch unit for switching one of the at least one short side to connect with the ground element to change a coupling current route on the radiation unit, such that the tunable antenna respectively operates in a first frequency band and a second frequency band.

A radio-frequency (RF) device for a wireless communication device, the RF device comprising:

• a tunable antenna comprising:
• a ground element for providing grounding;
• a signal feed-in terminal;
• a coupling unit electrically connected to the signal feed-in terminal for feeding the tunable antenna through coupling;
• a radiation unit comprising:
• a long side extended along a first direction;
• and
• at least one short side electrically connected to the long side and extended along a second direction;
• and
• a switch unit for switching one of the at least one short side to connect with the ground element to change a coupling current route on the radiation unit;
• an RF signal process module for processing an RF signal transmitted and received by the tunable antenna, and outputting a control signal according to the RF signal;
• and
• a control unit coupled between the RF signal process module and the switch unit for controlling the switch unit according to the control signal to adjust the coupling current route on the radiation unit, such that the tunable antenna respectively operates in a first frequency band and a second frequency band.