A millimeter-wave radar receiver using a z-cut LiNbO<inf>3</inf> optical modulator with orthogonal-gap-embedded patch-antennas on a low-κ dielectric material is proposed. A millimeter-wave from a reflected radar signal can be received by the patch-antennas and converted directly to a light-wave through electro-optic modulation. A low-κ dielectric material is used as a substrate for improving antenna gain. Additionally, an interaction length between millimeter-wave and lightwave electric fields becomes long. As a result, large modulation efficiency can be obtained, which is proportional to sensitivity of the millimeter-wave radar receiver. Optical millimeter-wave radar beam-forming can be obtained using the proposed device with meandering-gaps for controlling interaction between millimeter-wave and lightwave electric fields in electro-optic modulation. Analysis and experimentally demonstration of the proposed device are discussed and reported for 40GHz millimeter-wave bands. Optical millimeterwave radar beam-forming in 2-D is also discussed.
ASJC Scopus subject areas