| 发明名称 |
COMMUNICATION UNIT IN TUNNEL AND UNDERGROUND |
| 摘要 |
PURPOSE:To make it possible to communicate with a small transmission loss and a small standing wave, by providing a conical horn having a wave transmission/receiving equipment in a tunnel. |
| 申请公布号 |
JPS5377408(A) |
申请公布日期 |
1978.07.08 |
| 申请号 |
JP19760152893 |
申请日期 |
1976.12.21 |
| 申请人 |
HITACHI ELECTRONICS;HITACHI LTD;YAGI ANTENNA |
发明人 |
CHIBA JIROU;INABA TATSUO;KUWAMOTO YOSHITOMO;SAKANO OSAMU;SATOU RISABUROU |
| 分类号 |
H01P3/00;H01Q13/00;H04B5/00;H04B7/26;H04B13/00 |
主分类号 |
H01P3/00 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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