Shubhendu Bhardwaj

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In this work, we propose a new method of gain and pattern characterization of circularly polarized (CP) antennas in the sub-mm-wave and terahertz band. Traditional methods can not be scaled in these bands due to waveguide ports and low margin for phase errors. The proposed method employs a phase-less and rotation-less measurement process using standard(More)
We demonstrate that plasma wave instability in a grated and RTD-gated high electron mobility transistor (HEMT) leads to terahertz emissions. Numerical calculations are provided using a new full wave Maxwell-hydrodynamic solver that incorporates a novel excitation term to account for RTD gate loading, necessary for amplification. Using the proposed solver,(More)
— We present a thorough investigation of the optimum pumping configuration for L-band EDFA in order to maximize signal gain and minimize noise figure with forward and backward ASE pumping, by incorporating the selective property of the pump wavelength band from C-band EDFA section. A simulation of three-level rate equation has been carried out using 980 nm(More)
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