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We propose a new wireless electro-optic (EO) modulator using multi-layered stacked patch-antennas with a narrow gap for radio-over-fiber systems. This device uses a structure of vertically stacked patch antennas like the Yagi-Uda antenna, with an EO crystal and a low-dielectric-constant material hybrid substrate. The electric field for optical modulation and the patch length are increased by using...
We have proposed a new electro-optic signal converter which enables us to convert wireless millimeter-wave signals to lightwave signals. This is based on a LiNbO3 guided-wave optical modulator combined with vertically-stacked planar patch antennas embedded with a narrow (∼5 µm) gap. Utilizing the stacked structure, the antenna gain, antenna area, and electric field for optical modulation are increased,...
We discuss key device technologies for realization of an optical-fiber-network-connected distributed radar system in the millimeter-wave band using radio over fiber techniques. The radio over fiber technique is useful for precise signal generation and distribution over the fiber network. In the scenario, each millimeter-wave radar head is not necessary to be equipped with a precision radar signal...
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