Abstract
A compact Ka-band broadband waveguide-based traveling- wave spatial power combiner is presented. The low loss micro-strip probes are symmetrically inserted into both broadwalls of waveguide, quadrupling the coupling ways but the insertion loss increases little. The measured 16dB return-loss bandwidth of the eight-way back-to- back structure is from 30GHz to 39.4GHz (more than 25%) and the insertion loss is less than 1dB, which predicts the power-combining e-ciency is higher than 90%.
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