光とミリ波に対応した全方向性誘電体レンズと広角レンズ反射器
2009 年 2009 巻 122 号 p. 1-8
詳細
2009 年 2009 巻 122 号 p. 1-8
Luneberg lenses are common in X or K band applications such as radar reflectors or multi beam antennas for satellite communications. However, for conventional electromagnetic waves lenses, there is serious loss over 20GHz. In automobile applications, millimeter wave radar is now spreading all over the world for use in collision avoidance systems. The placement of radar reflectors with obstacles at the sides of roads is also one solution to avoiding collisions using radar.
This paper describes a new concept for a dielectric lens which could be made available in millimeter wave range and light range. It contains a spherical shell and a spherical lens.
As an example of its application, we propose a lens reflector with the aluminum film on the inside wall of the outer shell. Its Radar Cross Section (RCS) is evaluated in W band. It performs at 5dBsm (dB square meter) RCS at 76GHz and 94GHz maximum. Its reflection is observed in the 90 degree angle range corresponding to the angle covered with the metal reflector. The reflection deviation is below 2dB in wide frequency band. It reflects not only millimeter wave but also light and near infrared wave.
