Ferro-electric frequency selective surface radome
US5600325A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Feb 4, 1997 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2013/0281
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Ferro-electric frequency selective surface radomes that have dielectric layers that comprise voltage controlled material, and the electrical properties of the dielectric layers are voltage controlled. By varying the dielectric properties, the passband frequency of the radomes can be shifted to optimize frequency and angular response of the frequency selective surface. The radomes comprise grating screens having a plurality of printed radiating elements. Inner and outer voltage controlled dielectric layers are disposed on the grating screens. Relatively high ohms per square resistive films are disposed on exposed surfaces of the voltage controlled dielectric layers. In one embodiment, voltage control circuitry is coupled to the respective resistive films for controlling the voltages applied to the respective voltage controlled dielectric layers by actively varying the dielectric permittivity of the resistive films around a small percentage of its nominal value to provide a ground on outer surfaces of the dielectric layers. In another embodiment, the ferro-electric frequency selective surface radome may comprise voltage controlled dielectric layers disposed on one surface of the grat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.