Development of new detector for millimeter wave imaging

We have been developing a detector element which includes dipole antennas and a doubly balanced mixer fabricated on a dielectric substrate. This detector is designed for millimeter-wave imaging system on fusion device experiment in order to measure electron temperature distribution. Prototype detector which works in X-band shows ideal characteristics such as axisymmetric field pattern and detection sensitivity as an imaging element. Recently, we have fabricated same type detectors which work in E-band range. We have confirmed that the detectors have sensitivity in this frequency range.