| 发明名称 |
UNDERGROUND INFORMATION COMMUNICATION SYSTEM AND RELATED MANHOLE COVER |
| 摘要 |
A manhole cover is provided with an incorporated radio repeater and a repeater antenna attached onto its rear surface. Another repeater antenna is provided inside the sewer below the manhole. This repeater antenna is connected to a radio transmitter/receiver, an electric-optical/optical-electric signal converter, and an optical fiber cable. With this arrangement, the manhole cover and optical fiber cable are connected via radio communication.
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| 申请公布号 |
US2001011009(A1) |
申请公布日期 |
2001.08.02 |
| 申请号 |
US19970838263 |
申请日期 |
1997.04.17 |
| 申请人 |
HARADA TOSHIO;SHIMIZU YOJI;CHATANI YOSHIYUKI;FURUNO TAKAYOSHI |
发明人 |
HARADA TOSHIO;SHIMIZU YOJI;CHATANI YOSHIYUKI;FURUNO TAKAYOSHI |
| 分类号 |
H01Q1/44;E02D29/14;G02B6/44;H04B10/12;H04Q7/36;(IPC1-7):H04B13/02 |
主分类号 |
H01Q1/44 |
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