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Results of our research demonstrate possibilities of detection of microwaves radiation by means of asymmetrically narrowed YBa₂Cu₃O_7-<em>x</em> oxygen-rich (<em>x</em> ≤ 0.2) and oxygen-decomposed (<em>x</em> &gt; 0.5) in the necked region at temperatures higher than the critical temperature of the superconductor <em>T</em>_c at which superconductor exhibits properties of a heavily-doped semiconductor. Both types of structures, mounted into a 10 GHz waveguide, generate sub-linearly increasing amplitude of detected voltage with increase of incident power of pulsed 10-GHz-frequency microwave radiation. The voltage sensitivity <em>S_x</em>_≤ 0.2 ≥ 1.3 mV/W of oxygen-rich and <em>S_x</em>_&gt; 0.5 ≥ 9 mV/W of oxygen-decomposed structure were measured at room temperature. Asymmetrical shape of nonlinear current-voltage dependences depend<ins datetime="2014-05-05T19:11" cite="mailto:Artūras%20Jukna">s</ins> on oxygen content <em>x</em> in the necked region and temperature of the tested structure. Our results show that the asymmetrically narrowed structure with a necked region down to 10 <ins datetime="2014-06-13T09:36" cite="mailto:Admin">μ</ins><del datetime="2014-06-13T09:35" cite="mailto:Admin">m</del>m made of partially deoxygenated YBa₂Cu₃O_{7–<em>x</em>} superconductor can be used as a nonsuperconducting, nonlinear on-chip element (detector of MW power) in the YBa₂Cu₃O_{7–<em>x</em>} chip operating at temperatures below critical temperature <em>T</em>_c of the chip superconductor. <p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.20.2.6320">http://dx.doi.org/10.5755/j01.ms.20.2.6320</a></p>