UNDERGROUND ANTENNA Russian patent published in 2009 - IPC H01Q21/00 

FIELD: physics, radio.

SUBSTANCE: invention concerns radio engineering field, namely to the antenna technics and can be used as transmitting underground antennas (UA), preferentially in low-frequency (l.f.) wave band. The UA consists from N≥8 monopole antennas (MA), mounted in the chinks 1 drilled in thickness of mountain height 2, parallelly its inclines. Each chink has four MA: first 3, second 4, third 5 and fourth 6. MA 4 and MA 6 are mounted parallelly each other without dilatational and a transverse displacement. Second 4 and fourth 6 MA are executed from pieces of coaxial cable (CCP). First 3 and second 4 MA are connected accordingly to the first and second l.f. exits of the first transformer-amplifier (T-A) 7. Third 5 and fourth 6 HCB are connected accordingly to the first and second l.f. exits of the second T-A 8. In each chink 1 h.f. inputs of first T-A 7 are connected to feeding cables 9 forming a feeder circuit of h.f. signal. Feeding cables 9 are connected by cophased h.f. exits of the h.f. transmitter. The UA plan excludes l.f. misphasing of currents proceeding on MA that raises UA efficiency.

EFFECT: higher efficiency and maintenance of inconvertible operation with the nondirectional correspondent in space.

3 cl, 8 dwg