Frequency selective surface with repeating pattern of concentric closed conductor paths, and antenna having the surface
US5471224A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1993 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Nov 12, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q19/195
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A microwave element having a frequency selective surface (FSS) is formed of a substantially planar substrate of dielectric material which is transparent to electromagnetic radiation, and supports an array of radiators wherein the radiators are arranged in a plurality of sets of radiators. In each set of radiators, in a preferred embodiment, there are three concentric radiators fabricated of an electrically conductive material. The outermost radiator has a hexagonal closed form, and the inner radiators are configured as circular annuluses. In each set, the largest radiator has a circumference equal to a wavelength of a first frequency of radiation to be reflected from the (FSS), the sets being spaced apart by a spacing equal to one-third of the foregoing wavelength in the dielectric substrate. In a two-dimensional array of the sets of the radiators, the sets are located at vertices of equilateral triangles. An antenna incorporating the FSS includes a first horn operative at radiation of the foregoing wavelength and a reflector, both of which are disposed on one side of the FSS. Additional horns operative at higher frequencies located on the opposite side of the FSS for transmittal o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.