| US 7,548,202 B1 | ||
| Doppler radio direction finding antenna | ||
| William C. Jennings, Iowa City, Iowa (US) | ||
| Assigned to Rockwell Collins, Inc., Cedar Rapids, Iowa (US) | ||
| Filed on Aug. 29, 2006, as Appl. No. 11/511,565. | ||
| Int. Cl. G01S 3/52 (2006.01) | ||
| U.S. Cl. 342—418 | 16 Claims |
| 1. A radio direction finding antenna, comprising:
a dielectric material configured to rotate about an axis of rotation, the dielectric material having a first conductive surface;
and
a radiating element disposed within the dielectric material and electrically isolated from the first conductive surface, the
radiating element positioned a distance away from the axis of rotation and configured to be resonant at a predetermined frequency;
wherein rotation of the dielectric material and radiating element about the axis of rotation causes a Doppler effect in signals
received by the radiating element;
wherein the radiating element is a first radiating element, and further comprising a second radiating element disposed within
the dielectric material and electrically isolated from the first conductive surface, the second radiating element being coaxial
with the axis of rotation and configured to receive positioning information from a position signal source.
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