An electromagnetic field sensor linking a LiNbO3 electrooptical modulator with a circular antenna was studied. In this sensor, a Mach-Zehnder electrooptical modulator was used as one of the fundamental building blocks. The frequency response was flat from 50 MHz to 3 GHz. The minimum detectable electromagnetic field intensity is 0.7 mV/m at 50 MHz and 1.2 mV/m at 3 GHz, respectively.
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