Abstract:
A new method is proposed to enhance microwave radiation with a wavelength of $\lambda\sim$ 1 cm in an active medium comprising elongated conducting nanotubes dispersed in air, which is energy pumped by a nonstationary electric field. For a volume fraction of nanoparticles $c_0\approx$ 10$^{-3}$ in air at atmospheric pressure, the necessary value of the nonstationary pumping electric field (generated by a high-power nanosecond pulsed voltage source) is estimated at $\sim$200 J/m$^3$ and the weak signal gain is estimated at $\Gamma_0$ = 0.055 m$^{-1}$. One possible mechanism of microwave radiation enhancement in a spatial resonator is considered.
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