×

NEAR FIELD SPIRAL ANTENNA

  • US 3,780,373 A
  • Filed: 11/21/1972
  • Issued: 12/18/1973
  • Est. Priority Date: 11/21/1972
  • Status: Expired due to Term
First Claim
Patent Images

1. A near field antenna comprising:

  • an insulated printed circut board having at least first and second terminals thereon;

    a planar spiral conductor on said board, one end of said spiral conductor being connected to said first terminal;

    a length of additional conductor;

    means for connecting selected portions of said additional conductor between the other end of said spiral conductor and said second terminal;

    capacity shunt tuning means connected across said spiral conductor and said additional conductor;

    an output circuit;

    capacity coupling means between said spiral conductor and said output circuit; and

    a metal sheet mounted under said printed circuit in parallel fixed spaced relationship to the plane of said spiral conductor.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×