×

Method for secure communications using spiral antennas

  • US 6,448,941 B1
  • Filed: 04/21/1999
  • Issued: 09/10/2002
  • Est. Priority Date: 04/21/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. A communication method comprising:

  • transmitting a frequency-hopped communications signal from an antenna radiator that changes polarization with a change in frequency;

    receiving said frequency-hopped communications signal on an antenna receiver that has frequency-polarization characteristics matched to said antenna radiator and that is synchronized with said frequency-hopped communications signal as transmitted;

    wherein said antenna radiator and receiver are conductor-backed spiral antennas each comprising;

    a substrate with first and second substantially flat, opposite sides;

    at least one pair of spiral antenna elements disposed on said first side of said substrate; and

    a conducting ground plane disposed on said second side of said substrate.

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