# US 2014/0152515 A9 · Antenna device and wireless communication apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152515 A9 - Document ID: US20140152515A9 - Status: Published application - Kind: A9 - Application number: 13/981,906 - Filed: 2012-01-26 - Published: 2014-06-05 - Earliest claimed: 2011-01-26 - Assignees: Panasonic Intellectual Property Management Co., Ltd. - Inventors: Junnei Baba; Tetsuya Ashizuka; Ichiro Komaki - Web page: https://patentgrep.com/patent/US20140152515A9 ## CPC - H01Q 21/0006: {Particular feeding systems} - H01Q 1/245: {with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure} - H01Q 3/30: varying the {relative} phase {between the radiating elements of an array (H01Q3/2605, H01Q3/2658, H01Q3/2682, H01Q3/44 take precedence)} - H04B 1/3838: {Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use} - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - H04B: TRANSMISSION ## Abstract The antenna device includes a first antenna 11 that includes a first ground terminal 12; a second antenna 18 that includes a second ground terminal 20; a ground conductor 28 to which the first antenna 11 is connected through the first ground terminal 12 and the second antenna 18 is connected through the second ground terminal 20; and a phase shifter 24 that controls a phase difference between a first current ie1 and a second current ie2. The phase shifter 24 controls the phase difference between the first current ie1 and the second current ie2 so that the first current ie1 and the second current ie2 have components to cancel each other. ## Claims ### Claim at position 1 1-7. (canceled) ### Claim 8 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. ### Claim 9 (depends on 8) The antenna device according to claim 8, further comprising: a printed circuit board having a first surface and a second surface that is a rear surface of the first surface, wherein the first antenna and the second antenna are provided on the first surface, and wherein the ground conductor is provided on the second surface. ### Claim 10 (depends on 9) The antenna device according to claim 9, wherein the ground conductor is a ground pattern that covers the second surface. ### Claim 11 (depends on 8) The antenna device according to claim 8, wherein the phase shifter controls the first current and the second current so that the phase difference therebetween is about 180°. ### Claim 12 (depends on 8) The antenna device according to claim 8, further comprising: a power distributor that approximately equally distributes electric power of electric current that flows in the first antenna and electric power of electric current that flows in the second antenna. ### Claim 13 (depends on 8) The antenna device according to claim 8, wherein the first antenna uses a first frequency corresponding to the first current, and wherein the second antenna uses a second frequency that is the same as the first frequency, corresponding to the second current. ### Claim 14 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. ### Claim 15 (depends on 14) The antenna device according to claim 14, wherein the first antenna and the second antenna are arranged so that the first current and the second current flow outside the area. ### Claim 16 (depends on 14) The antenna device according to claim 14, further comprising: a printed circuit board having a first surface and a second surface that is a rear surface of the first surface, wherein the first antenna and the second antenna are provided on the first surface, and wherein the ground conductor is provided on the second surface. ### Claim 17 (depends on 16) The antenna device according to claim 16, wherein the ground conductor is a ground pattern that covers the second surface. ### Claim 18 (depends on 14) The antenna device according to claim 14, wherein the phase shifter controls the first current and the second current so that the phase difference therebetween is about 180°. ### Claim 19 (depends on 14) The antenna device according to claim 14, further comprising: a power distributor that approximately equally distributes electric power of electric current that flows in the first antenna and electric power of electric current that flows in the second antenna. ### Claim 20 (depends on 14) The antenna device according to claim 14, wherein the first antenna uses a first frequency corresponding to the first current, and wherein the second antenna uses a second frequency that is the same as the first frequency, corresponding to the second current. ### Claim 21 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. ### Claim 22 (depends on 21) The wireless communication apparatus according to claim 21, wherein the first antenna is larger in size than the second antenna. ### Claim 23 (depends on 21) The wireless communication apparatus according to claim 21, further comprising: a printed circuit board having a first surface and a second surface that is a rear surface of the first surface, wherein the first antenna and the second antenna are provided on the first surface, and wherein the ground conductor is provided on the second surface. ### Claim 24 (depends on 23) The wireless communication apparatus according to claim 23, wherein the ground conductor is a ground pattern that covers the second surface. ### Claim 25 (depends on 21) The wireless communication apparatus according to claim 21, wherein the phase shifter controls the first current and the second current so that the phase difference therebetween is about 180°. ### Claim 26 (depends on 21) The wireless communication apparatus according to claim 21, further comprising: a power distributor that approximately equally distributes electric power of electric current that flows in the first antenna and electric power of electric current that flows in the second antenna. ### Claim 27 (depends on 21) The wireless communication apparatus according to claim 21, wherein the first antenna uses a first frequency corresponding to the first current, and wherein the second antenna uses a second frequency that is the same as the first frequency, corresponding to the second current.