Essential applications of terahertz technology are urgently in need of compact, tunable solid-state\udcontinuous wave radiation sources. However, no satisfactory solution is yet available for the\udfrequency range of up to approximately 1.0 THz. Here, we present coherent radiation from large\udseries arrays of Josephson junctions between 0.1 and 0.25 THz with off-chip radiation power of\ud7 microWatt. Niobium junctions oscillate at 4.2 K and the detection has been done at room temperature.\udThe well-known obstacle to impedance matching is overcome by utilizing the excited resonances\udin the junction substrates serving as dielectric resonator antennae.
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