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Tunnel distributed cable antenna system with signal top coupling approximately same radiated energy

  • US 4,972,505 A
  • Filed: 12/06/1988
  • Issued: 11/20/1990
  • Est. Priority Date: 12/06/1988
  • Status: Expired due to Term
First Claim
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1. A system for providing radio communication to and from a transceiver in a confined region into which external radio signals do not penetrate, said system comprising:

  • (a) first and second elongated low loss coaxial cable segments in said region,(b) means for applying radio frequency signals to one end of said first cable segment,(c) a plurality of transmitting antennas proximate to said first cable segment at spaced intervals therealong,(d) a plurality of signal tap means coupling each of said transmitting antennas to said first cable segment, each tap means having the function of extracting a preselected amount of radio frequency energy from said first cable segment and for feeding such preselected amount of energy to the transmitting antenna with which it is associated so that the energy radiated from each transmitting antenna is approximately the same,(e) a plurality of receiving antennas proximate to said second cable segment at spaced intervals therealong,(f) means for receiving radio frequency signals from one end of said second cable segment,(g) a plurality of signal tap means coupling each of said receiving antennas to said second cable segment, each tap means having the function of feeding a preselected amount of radio frequency energy to said second cable segment from the receiving antenna with which it is associated so that the total attenuation of signals received by each of said receiving antennas from said antennas to said one end of said second cable segment is approximately the same.

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