Structure for wireless communication in an electromagnetically shielded building

• US 4,941,207 A
• Filed: 03/06/1987
• Issued: 07/10/1990
• Est. Priority Date: 05/01/1984
• Status: Expired due to Fees

• Current Assignee: Nihon Musen Kabushiki Kaisha
• Original Assignee: Nihon Musen Kabushiki Kaisha
• Inventors: Ishikawa, Hisashi, Maeda, Takamasa
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): PASCAL, LESLIE C
• Application Number:
  US07/022,646
• Time in Patent Office: 1,222 Days
• Field of Search: 250/515.1, 250/517.1, 174/35 MS, 455/300, 455/41, 455/55, 455/606, 455/607, 455/600, 455/617, 381/79, 379/55, 343/720, 343/841
• US Class Current: 398/119
• CPC Class Codes: H04B 7/24 for communication between two or more posts wireless communication networks H04W

Abstract

A structure for wireless communication in an electromagnetically shielded building has an outer wall made of an electromagnetically shielding material such as concrete or an electrically conductive material. The outer wall has a window composed of a glass pane with an electromagnetically shielding material coated thereon or mixed therein. The outer wall and the window are grounded, and jointly define an electromagnetically shielded space in which wireless transmission/reception devices are disposed. Wireless communication is effected between the wireless transmission/reception devices by radio waves in a selected frequency range and of a selected power output.

Claims

1. A structure for wireless communication in an electromagnetically shielded building, comprising an outer wall made of an electromagnetic shielding material, a ceiling member incorporating an antenna, and a window comprised of a glass pane including an electromagnetic shielding member, wherein said outer wall and said window jointly define an electromagnetically shielded space, said outer wall comprising an electrically conductive material and being connected to ground, said outer wall and said window being electrically connected to each other, wireless transmission/reception means disposed in said electromagnetically shielded space, and said electromagnetically shielded space including therein an electromagnetically shielded subspace on each floor or each room on a floor of the building, the arrangement being such that wireless communication can be effected with radio waves in a selected frequency range within said space between the wireless transmission/reception means and said antenna.

2. A structure according to claim 1, wherein said electromagnetic shielding member is coated as a layer on a surface of said glass pane, said glass pane being supported by a window frame made of an electrically conductive material, said electromagnetic shielding member and said window frame being electrically connected to each other.

3. A structure according to claim 2, wherein said glass pane is fixed to said outer wall by an adhesive including an electrically conductive material.

4. A structure according to claim 3, wherein said outer wall has a recess or a step and said glass pane has a projection or a step, said window being fixed to said outer wall by holding said projection or said step and said recess or said step in interfitting relationship.

5. A structure according to claim 1, wherein said electromagnetic shielding member comprises an electrically conductive punched metal plate sandwiched between two glass panes of the window, said glass panes being supported by a window frame made of an electrically conductive material, said punched metal plate and said window frame being electrically connected to each other.

6. A structure according to claim 1, wherein said electromagnetic shielding member is mixed in said glass pane, said glass pane being supported by a window frame made of an electrically conductive material, said glass pane and said window frame being electrically connected to each other.

7. A structure according to claim 1, wherein said electromagnetic shielding member comprises an electrically conductive net embedded in said glass pane, said glass pane being supported by a window frame made of an electrically conductive material, said net and said window frame being electrically connected to each other.

8. A structure according to claim 1, further comprising an entrance/exit opening for entering and leaving said space having an electromagnetic shielding construction.

9. A structure according to claim 8, wherein said entrance/exit opening comprises a first door and a second door, one of said first and second doors being closed when passing through said entrance/exit opening.

10. A structure according to claim 9, wherein each of said first and second doors comprises a door member and an electromagnetic shielding panel mounted on said door member for preventing radio waves from leaking out when the doors are closed.

11. A structure according to claim 1, further including an elevator movably disposed in said electromagnetically shielded space, and an electromagnetic shielding door disposed on a floor of the building where said elevator can be stopped.

12. A structure according to claim 11, wherein there are a plurality of elevators, further including electromagnetic shielding walls each disposed between adjacent ones of the elevators.

13. A structure according to claim 1, wherein said electromagnetic shielding member is made of an oxide of indium tin.

14. A structure according to claim 1, wherein said electromagnetic shielding member is made of a nickel-acryl paint.

15. A structure according to claim 1, further including an electromagnetic shield extending upwardly from the roof of the building, and a satellite antenna disposed in a space surrounded by said electromagnetic shield above said roof of the building.