Title:
ANECHOIC CHAMBER
Document Type and Number:
Japanese Patent JP3265646
Kind Code:
B2
Abstract:
PURPOSE: To obtain an anechoic chamber having excellent anechoic chamber performance, securing a wide internal space and formed inexpensively by forming a floor of a waveguide section as an earth equivalent floor and forming at least part of a ceiling and side wall faces of the waveguide section with a ferrite radio wave absorbing body.
CONSTITUTION: Floor faces 11e, 12e, 15e are formed to be earth equivalent floors having a characteristic equivalent to that of the earth in terms of radio waves by combining a ferrite tile and a conductive film. A transmission section 11 and a reception section 12 are connected by a taper-shaped wave guide section 15. The waveguide section 15 is designed to obtain a radio wave attenuation effect as high as possible to reduce the reflection of the radio wave in the single mode sent from the transmission section 11 due to local ununiformity of the wall face to the utmost and to obtain a state close to a radio wave propagation characteristic at a remote zone in the radio wave propagation characteristic at the remote zone in a free space at a short transmission distance. Three side faces except the floor of the waveguide section 15, that is, part or all of the left right side wall faces and a ceiling face 15C is made of a flat plate ferrite radio wave absorbing body 16.
Inventors:
Ken Ishino
Yasuo Hashimoto
Toshiaki Kobayashi
Shingo Seki
Kazuhiko Ogawa
Harunori Murakami
Keisuke Tanaka
Yasuo Hashimoto
Toshiaki Kobayashi
Shingo Seki
Kazuhiko Ogawa
Harunori Murakami
Keisuke Tanaka
Application Number:
JP27255392A
Publication Date:
March 11, 2002
Filing Date:
September 17, 1992
Export Citation:
Assignee:
TDK Co., Ltd.
NIPPON SHEET GLASS COMPANY,LIMITED
NIPPON SHEET GLASS COMPANY,LIMITED
International Classes:
H01Q17/00; H05K9/00; (IPC1-7): H01Q17/00; H05K9/00
Domestic Patent References:
| JP253337A | ||||
| JP3124099A | ||||
| JP212996A | ||||
| JP1135139A | ||||
| JP2196500A | ||||
| JP2174199A | ||||
| JP462900A | ||||
| JP4169866A | ||||
| JP2228097A | ||||
| JP453198A | ||||
| JP577782A | ||||
| JP577781A | ||||
| JP577783U |
Attorney, Agent or Firm:
Keiichi Yamamoto