Antenna having electrically controllable radar cross-section
US6300894A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1999 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Jul 9, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An RF interface is configured as a laminate structure having a core layer of a ferromagnetic ceramic material, such as barium strontium titanate, whose permitivity is electrically controllable to modify the behavior of impinging electromagnetic energy, as one of minimally attenuated transmission, maximally attenuated absorption, and highly unattenuated reflection. Opposite surfaces of the ceramic core are coated with an electrically lossy material, such as indium tin oxide, to which a differential DC voltage is applied, and thereby imparting a DC electric field to the core layer. For an antenna application, during transmit/receive mode, the differential voltage has a magnitude that renders the laminate's core highly conductive, and thereby reflective to the RF wavelength being sourced from or received by an associated feed horn. During other times, the differential voltage renders the laminate effectively transparent to RF wavelengths in a prescribed band of interest (e.g., a search radar emanating from a threat platform, such as an aircraft).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.