Antenna device and wireless communication apparatus

An antenna device having a plurality of antennas, comprising:

• a first antenna that includes a first ground terminal;
• a second antenna that includes a second ground terminal;
• a ground conductor to which the first antenna is connected through the first ground terminal and the second antenna is connected through the second ground terminal;
• and
• a phase shifter that controls a phase difference between a first current that is input to the first antenna from the ground conductor through the first ground terminal or is output to the ground conductor from the first antenna through the first ground terminal and a second current that is input to the second antenna from the ground conductor through the second ground terminal or is output to the ground conductor from the second antenna through the second ground terminal,
• wherein the phase shifter controls the phase difference between the first current and the second current so that the first current and the second current have components to cancel each other.

An antenna device having a plurality of antennas, comprising:

• a first antenna that includes a first ground terminal;
• a second antenna that includes a second ground terminal and is smaller in size than the first antenna;
• a ground conductor to which the first antenna is connected through the first ground terminal and the second antenna is connected through the second ground terminal;
• and
• a phase shifter that controls a phase difference between a first current that is input to the first antenna from the ground conductor through the first ground terminal or is output to the ground conductor from the first antenna through the first ground terminal and a second current that is input to the second antenna from the ground conductor through the second ground terminal or is output to the ground conductor from the second antenna through the second ground terminal,
• wherein the phase shifter controls the phase difference between the first current and the second current so that the second current cancels a part of the first current in a desired area.

A wireless communication apparatus that performs communication in a wireless manner, comprising:

• a first antenna that includes a first ground terminal;
• a second antenna that includes a second ground terminal;
• a ground conductor to which the first antenna is connected through the first ground terminal and the second antenna is connected through the second ground terminal;
• a phase shifter that controls a phase difference between a first current that is input to the first antenna from the ground conductor through the first ground terminal or is output to the ground conductor from the first antenna through the first ground terminal and a second current that is input to the second antenna from the ground conductor through the second ground terminal or is output to the ground conductor from the second antenna through the second ground terminal;
• and
• a speaker that outputs sound,
• wherein the phase shifter controls the phase difference between the first current and the second current so that the first current and the second current have components to cancel each other, on the speaker or in the vicinity of the speaker, and
• wherein the first current and the second current flow outside the area.