Self-mixing expendable
US5369408A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1990 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Apr 23, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention is directed to an expendable which includes an electronic circuit for introducing a simulated Doppler frequency shift. When dropped from an aircraft, the expendable is used to confuse hostile radar operations. In the past, the approach has been to use a high frequency electronic switch (PIN diode) and drive oscillator to change the impedance of the expendable antenna. This invention involves a simplification which combines the electronic switch and its drive oscillator into a single semiconductor component. By connecting a feedback circuit from the collector to the base of a high frequency transistor as well as to the two arms of the antenna, the antenna impedance is changed at the transistor oscillating frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.