MICROWAVE COMMUNICATION DEVICE FOR UNDERGROUND WORKINGS OF MINES Russian patent published in 1997 - IPC

FIELD: superhigh-frequency communications for underground workings of mines. SUBSTANCE: device has branched-off network of single-wire transmission lines with electromagnetic field re-emitters, central transceiver, matched loads, and subscriber's transceivers. Branched-off network duplicates working network in mine and carries matched loads at its ends. Horns are used to excite single-wire transmission line. EFFECT: provision for establishing two-way communication between central transceiver and subscribers as well as between any subscribers of network; microwave communication device that does not emit electromagnetic field into space can operate in wide frequency band, transmit TV signal and provides for serviceability check of all items of mine working communication system. 1 dwg