초록 ▼

A reflector antenna arrangement can transmit and receive both infrared (IR) and millimeter wave (RF) radiation. The arrangement includes a main reflector (1), a subreflector (2), an IR feed system (4), an RF feed system (3), a radome (5), and a bispectral window (6) arranged in an opening provided i

A reflector antenna arrangement can transmit and receive both infrared (IR) and millimeter wave (RF) radiation. The arrangement includes a main reflector (1), a subreflector (2), an IR feed system (4), an RF feed system (3), a radome (5), and a bispectral window (6) arranged in an opening provided in a central area of the main reflector (1). The RF feed system is oriented so that the RF radiation path includes a double reflection from the subreflector and from the main reflector, while the IR feed system is arranged directly behind the bispectral window so that the IR beam path extends directly through the bispectral window without reflecting from the main reflector or the subreflector. The bispectral window has a high reflectance for the RF radiation and a high transmittance of the IR radiation. The bispectral window is made of a dielectric material and has rotationally symmetrical front and back surfaces, whereby the front surface contour is optimally matched to the front surface of the main reflector and the back surface contour achieves an optimal reflectivity of the RF radiation and an optimal transmissivity of the IR radiation. Undesired influences between the IR radiation and the RF radiation are avoided by the separation of the signal beam paths.

대표청구항 ▼

[ What is claimed is:] [1.]1. An arrangement for transmitting or receiving infrared radiation and radio frequency radiation, comprising:a reflector adapted to reflect said radio frequency radiation, having a front reflector surface arranged to have said radio frequency radiation incident thereon, an

[ What is claimed is:] [1.]1. An arrangement for transmitting or receiving infrared radiation and radio frequency radiation, comprising:a reflector adapted to reflect said radio frequency radiation, having a front reflector surface arranged to have said radio frequency radiation incident thereon, and having an opening therein, anda bispectral window arrangement including a window comprising a first dielectric material;wherein:said window is arranged in said opening in said reflector,said window has a rotationally symmetric aspherical front window surface facing toward the same side of said reflector as said front reflector surface and a rotationally symmetric aspherical back window surface opposite said front window surface,said bispectral window arrangement is substantially transmissive for said infrared radiation so as to transmit through said window arrangement a majority of said infrared radiation incident on said window arrangement, and is substantially reflective for said radio frequency radiation so as to reflect from said window arrangement a majority of said radio frequency radiation incident on said window arrangement,said front reflector surface is a free-form surface that is not rotationally symmetric and is not a conic section surface,said free-form surface has a shape around said opening that can be approximated across said opening as a general second order rotationally symmetric surface, andsaid front window surface has a surface shape defined by said general second order rotationally symmetric surface.