Millimeter-Wave Radar Receiver Using Z-Cut LiNbO3 Optical Modulator with Orthogonal-Gap-Embedded Patch-Antennas on Low-k Dielectric Material

Atsushi KANNO
Hiroshi MURATA
Yasuyuki OKAMURA

IEICE TRANSACTIONS on Electronics   Vol.E98-C    No.8    pp.783-792
Publication Date: 2015/08/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E98.C.783
Type of Manuscript: Special Section PAPER (Special Section on Microwave Photonics)
Category: MWP Device and Application
LiNbO3 optical modulator,  patch-antenna,  low-k dielectric material,  millimeter-wave radar,  

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A millimeter-wave radar receiver using a z-cut LiNbO3 optical modulator with orthogonal-gap-embedded patch-antennas on a low-k dielectric material is proposed. A millimeter-wave from a reflected radar signal can be received by the patch-antennas and converted directly to a lightwave through electro-optic modulation. A low-k 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 millimeter-wave radar beam-forming in 2-D is also discussed.