Antenna apparatus and wireless communication apparatus

• US 6,380,900 B1
• Filed: 03/16/2001
• Issued: 04/30/2002
• Est. Priority Date: 03/21/2000
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kanayama, Yoshiki
• Primary Examiner(s): Ho, Tan
• Application Number:
  US09/809,928
• Time in Patent Office: 410 Days
• Field of Search: 343/702, 343/725, 343/729, 343/718, 343/872, 343/700.MS, 343/895
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/245 with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/371 Branching current paths

Abstract

An antenna apparatus and a wireless communication apparatus are proposed by the present invention to reduce an absorption factor of electromagnetic waves absorbed by a human body during the telephone call. By arranging antenna disposing means so as to dispose an antenna element indicating a higher absorption factor the more distant from a human body on the basis of an absorption factor of electromagnetic waves absorbed by a human body, measured in advance when at least two or more antenna elements different in electrical length operate as antennas under the same disposing conditions, it is possible to reduce the absorption factor of electromagnetic waves absorbed by a human body during the telephone call in such a degree as to keep an antenna element indicating the higher absorption factor the more distant from the human body even if at least two or more antenna elements are disposed.

Claims

1. An antenna apparatus comprising:

two antenna elements respectively different in electrical length for receiving signals of different respective frequencies; and

antenna disposing means for disposing a one of said two antenna elements indicating a higher absorption factor more distant from a human body than the other of said two antenna elements, on the basis of the absorption factor of electromagnetic waves absorbed by said human body, measured in advance when said two antenna elements operate respectively as antennas under the same disposing conditions.

2. The antenna apparatus according to claim 1 wherein said two antenna elements are electrically connected to a common feeding point.

3. The antenna apparatus according to claim 2 wherein said antenna disposing means comprises:

antenna hold means for holding said two antenna elements collectively; and

installation means to which said antenna hold means is installed.

4. The antenna apparatus according to claim 3 further comprising antenna positioning means for positioning said two antenna elements held by said antenna hold means in such an arrangement ordered in sequence from a higher to a lower absorption factor thereof.

5. The antenna apparatus according to claim 4 further comprising posture regulation means for regulating an installation posture of said antenna hold means to said installation means so as to keep said antenna element indicating a higher absorption factor the more distant from said human body.

6. An antenna apparatus according to claim 5 wherein said antenna element indicating the higher absorption factor has a given location serving for said common feeding point and a feeder line electrically connected to a feeding point together with the other of said two antenna elements and said antenna hold means holds said feeder line the most distant from said human body.

7. A wireless communication apparatus using two types of wireless communication systems using respectively two different wireless communication frequencies, said apparatus comprising:

two antenna elements different in respective electrical length corresponding to said two wireless communication frequencies; and

antenna disposing means for disposing a one of said two antenna elements indicating a higher absorption factor at a greater distance from a user'"'"'s body on the basis of the absorption factor of electromagnetic waves absorbed by said user'"'"'s body, measured in advance when said two antenna elements operate respectively as antennas under the same disposing conditions.

8. The wireless communication apparatus according to claim 7 wherein said two antenna elements are electrically connected to a common feeding point.

9. The wireless communication apparatus according to claim 8 wherein said antenna disposing means comprises:

antenna hold means for holding said two antenna elements collectively; and

installation means to which said antenna hold means is installed.

10. The wireless communication apparatus according to claim 9 further comprising antenna positioning means for positioning said two antenna elements to be held by said antenna hold means in such an arrangement ordered in sequence from a higher to a lower absorption factor thereof.

11. The wireless communication apparatus according to claim 10 further comprising posture regulation means for regulating an installation posture of said antenna hold means to said installation means so as to keep said antenna element indicating a higher absorption factor the more distant from said human body.

12. The wireless communication apparatus according to claim 11 wherein said antenna element indicating the higher absorption factor has a given location serving for said common feeding point and a feeder line electrically connected to the feeding point together with the other of said two antenna elements and said antenna hold means holds said feeder line the most distant from said human body.