Antenna apparatus, method for controlling thereof and vehicle having the same

1. An antenna apparatus comprising:

an antenna pattern unit receiving a radio frequency (RF) signal;

a first ground unit; and

a tunable switch unit electrically connecting the first ground unit to the antenna pattern unit and moving a RF signal band of an antenna when power is applied to the antenna apparatus from a power supplier,

wherein the tunable switch unit includes a power distributor provided with at least two resistances, and the power distributor distributes the power applied to the antenna apparatus from the power supplier corresponding to a resistance of the at least two resistances,

wherein the tunable switch unit further includes a power supply stabilization circuit which is configured with a resistance, an inductor, and a capacitor, and the power supply stabilization circuit allows power supplied from the power supplier to be stably applied to a controller, and

wherein the tunable switch unit further includes a controller controlling the first ground unit and the antenna pattern unit to be connected to each other or disconnected from each other according to whether the power is applied to the antenna apparatus from the power supplier.

2. The antenna apparatus of claim 1 , wherein the controller controls the first ground unit and the antenna pattern unit to be connected to each other when the power is applied to the antenna apparatus from the power supplier and the power is distributed via the power distributor.

3. The antenna apparatus of claim 1 , wherein the controller controls the first ground unit and the antenna pattern unit to be disconnected from each other when the power is not applied to the antenna apparatus from the power supplier and the power is not distributed via the power distributor.

4. The antenna apparatus of claim 1 , wherein the first ground unit includes at least one of a variable inductor and a variable capacitor.

5. The antenna apparatus of claim 1 , wherein the power applied to the antenna apparatus from the power supplier is 3 volts or a predetermined voltage.

6. The antenna apparatus of claim 1 , further comprising:

a matching unit matching an impedance of the antenna.

7. The antenna apparatus of claim 1 , further comprising:

a second ground unit different from the first ground unit, wherein the second ground unit is connected to the antenna pattern unit.

8. A vehicle comprising:

a power supplier; and

an antenna apparatus including an antenna pattern unit receiving a radio frequency (RF) signal, a first ground unit, and a tunable switch unit electrically connecting the first ground unit to the antenna pattern unit and moving a RF signal band of an antenna when power is applied to the antenna apparatus from the power supplier,

wherein the tunable switch unit includes a power distributor provided with at least two resistances, and the power distributor distributes the power applied to the antenna apparatus from the power supplier corresponding to a resistance of the at least two resistances,

wherein the tunable switch unit further includes a power supply stabilization circuit which is configured with a resistance, an inductor, and a capacitor, the power supply stabilization circuit allows power supplied from the power supplier to be stably applied to a controller, and

wherein the tunable switch unit includes a controller controlling the first ground unit and the antenna pattern unit to be connected to each other or disconnected from each other according to whether the power is applied to the antenna apparatus from the power supplier.

9. The vehicle of claim 8 , wherein the controller controls the first ground unit and the antenna pattern unit to be connected to each other when the power is applied to the antenna apparatus from the power supplier and the power is distributed via the power distributor.

10. The vehicle of claim 8 , wherein the controller controls the first ground unit and the antenna pattern unit to be disconnected from each other when the power is not applied to the antenna apparatus from the power supplier and the power is not distributed via the power distributor.

11. The vehicle of claim 8 , wherein the first ground unit includes at least one of a variable inductor and a variable capacitor.

12. The vehicle of claim 8 , wherein the power applied to the antenna apparatus from the power supplier is 3 volts or a predetermined voltage.

13. The vehicle of claim 8 , further comprising:

a feeder cable connecting the antenna apparatus to the power supplier.