Antenna unit, method of controlling the same, and mobile device including the same

An antenna unit comprising:

• a first antenna;
• a second antenna connected to the first antenna and receiving an electrical signal from the first antenna;
• a third antenna receiving an electrical signal from the second antenna;
• and
• a frequency band transition unit interposed between the second antenna and the third antenna and transitioning between frequency bands receivable by the first antenna, the second antenna, and the third antenna according to channels.

A mobile device comprising:

• an antenna unit comprising;
• at least two antennas;
• and
• a frequency band transition unit interposed between two of the at least two antennas and transitioning between frequency bands receivable by the antenna unit according to channels;
• a storage unit storing voltage values corresponding to the channels for use in controlling the antenna unit to transition between the frequency bands receivable by the antenna unit according to the channels;
• a controller outputting the voltage values corresponding to the channels based on the voltage values corresponding to the channels stored in the storage unit;
• and
• a digital/analog converter converting the voltage values corresponding to the channels output by the controller into analog voltage values corresponding to the channels and providing the analog voltage values corresponding to the channels to the antenna unit.