RF and IR bispectral window and reflector antenna arrangement including the same

US6307521A · kind A · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Gerhard Schindler · Grünstadt, DE
• Erwin Haertinger · Stockdorf, DE
• Uwe Leupelt · Munich, DE

Key dates

• Filing date: Aug 23, 1999
• Grant date: Oct 23, 2001
• Expiry date: Aug 23, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01Q5/45
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

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 an…