Communications: radio wave antennas – Antennas – Antenna components
Patent
1993-11-12
1995-11-28
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Antenna components
H01Q 1502, H01Q 1524
Patent
active
054712246
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 of radiation through the FSS.
REFERENCES:
patent: 3189907 (1965-06-01), Buskirk
patent: 3394378 (1968-07-01), Williams et al.
patent: 4495506 (1985-01-01), Sasser et al.
patent: 5130718 (1992-07-01), Wu et al.
patent: 5162809 (1992-11-01), Wu
J. Huang, et al., "Tri-Band Frequency Selective Surface with Circular Ring Elements", IEEE, 1991, pp. 204-207.
Blum Theodore M.
Space Systems Loral, Inc.
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