A Two-dimensional quasi-optical power dividing/combining circuit has beenexperimentally investigated at 150 GHz. It consists of a rectangular hornantenna array as receiving/transmitting unit and a dual offset reflector setupto match the radiated field(s) to the pattern of the receiving antenna(s). Toverify both design and adjustment of the quasi-optical circuit, electric fieldscans have been performed in selected planes and volumes of the setup. Tomeasure the spatial electric field distribution, a vector field measurementsystem has been developed which operates in the frequency range between148 GHz and 152 GHz. Excellent agreement between calculated and measuredresults for a horn antenna array approve the predicted results calculated underthe physical optics approximation. Measured power dividing/combining efficiencyof the passive structure of 63% for an inter-element spacing of10$ lambda$ indicates that the power combining principle is a suitable methodup to submillimeter wavelengths.
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