Title :
Characteristic properties of underground radio communications
Author :
Levin, Boris ; Haridim, Motti
Author_Institution :
Fac. of Eng., Holon Inst. of Technol. (HIT), Holon, Israel
Abstract :
The problem of underground radio communication is considered. Its necessity and difficulties of its realization are shown. The main difficulty is quick attenuation of transmitted signal. A version of the communication system, based on a compromise between the large dimensions of the antenna and the great earth losses, is suggested. In authors´ opinion, the operation frequency must be medium frequency. Antennas with sinusoidal and cosine distribution of current are compared. It is offered to use a directional antenna structure, consisting of flat self-complementary antennas of a new type.
Keywords :
directive antennas; radiocommunication; underground communication; cosine distribution; directional antenna; earth losses; self-complementary antennas; sinusoidal distribution; underground radio communications; Communication systems; Dipole antennas; Earth; Receiving antennas; Transmitting antennas; directional antennas; propagation of radio waves; underground communications;
Conference_Titel :
Electrical & Electronics Engineers in Israel (IEEEI), 2014 IEEE 28th Convention of
Conference_Location :
Eilat
Print_ISBN :
978-1-4799-5987-7
DOI :
10.1109/EEEI.2014.7005847
