Antenna device and mobile communication unit

An antenna device comprising;

• a) a spiral-shaped first antenna element of which one end is open and the other end is electrically coupled to a circuit;
• b) a second antenna element with both ends are open, and which is insulated from said first antenna element;
• and
• c) a third antenna element placed such that it can slide inside said first antenna element;
• wherein electricity is supplied only to said third antenna element when said third antenna element is moved through said first antenna element in an upward position, and through said third antenna element, resonance occurs in the first and second frequency bands via a switch, and when the third antenna element is in a downward position, electricity is supplied only to said first antenna element, and through said first and said second antenna elements, resonance occurs respectively in the first and second frequency bands via the switch.

An antenna device comprising:

• a) a spiral-shaped first antenna element of which a first end is open and a second end is electrically coupled to a circuit;
• b) a second element with both ends being open, said second antenna element being insulated from said first antenna element, said second antenna element having a meandering shaped conductive section, the meandering shaped conductive section of said second antenna element extending lengthwise parallel to a center axis of said spiral-shaped first antenna element;
• and
• c) a third antenna element placed such that it can slide inside said first antenna element;
• wherein electricity is supplied only to said first and said third antenna elements when said third antenna element is in an upward position, and through said third antenna element, resonance occurs in the first and second frequency bands via a switch, and when said third antenna element is in a downward position, electricity is supplied only to said first antenna element, and through said first and said second antenna elements, resonance occurs respectively in the first and second frequency bands via the switch.

An antenna device comprising;

• a) a spiral-shaped first antenna element of which a first end is open and a second end is electrically coupled to a circuit;
• b) a second antenna element with both ends being open, said second antenna element being insulated from said first antenna element, said second antenna element having a meandering shaped conductive section, the meandering shaped conductive section of said second antenna element extending lengthwise parallel to a center axis of said spiral-shaped first antenna element;
• and
• c) a third antenna element having said first and said second antenna element integrally formed on the top thereof, and which is placed such that it can slide inside a housing of a communication terminal;
• wherein electricity is supplied only to said third antenna element when said third antenna element is in an upward position, and through said third antenna element, resonance occurs in the first and second frequency bands via a switch, and when said third antenna element is stored, electricity is supplied only to said first antenna element, and through said first and said second antenna elements, resonance occurs respectively in the first and second frequency bands via the switch.

A dual frequency antenna device comprising;

• a) a spiral-shaped first antenna element of which a first end is open and a second end is electrically coupled to a circuit;
• and
• b) a second antenna element changing directions more than twice and comprising a conductive plate and having both ends being open, said second antenna element being insulated from said first antenna element;
• wherein said first and said second antenna elements resonate respectively in a first frequency in a first frequency band and a second frequency in a second frequency band, the second frequency being higher than the first frequency.