Method for secure communications using spiral antennas
US6448941B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1999 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Apr 21, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/27
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method for communicating with a decreased probability of detection by an unintended listening party uses frequency hopping and two substantially identical linearly polarized antennas whose polarization vector is synchronized to frequency. Synchronization of polarization with frequency is accomplished through specifically designed conductor-backed spiral antennas. For these conductor-backed spiral antennas, a change in frequency is synchronized to a change in the polarization vector of the communication signal. Since the receiving station will be programmed to alter its reception frequencies in accordance with those being transmitted, the second spiral antenna will automatically change its polarization upon making these frequency changes. A rapid change of polarization increases the difficulty in detecting and intercepting the communication by parties for whom the message was not intended.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.