Numerical simulations of amplification and propagation of space charge waves in InP films is investigated theoretically. A microwave frequency conversion using the negative differential conductivity phenomenon is carried out when the harmonics of the input signal are generated. An increment in the amplification is observed in n-InP films at essentially higher frequencies f<70GHz, when compared with n-GaAs films f<44GHz. This work provides a way to achieve a frequency conversion and amplification of micrometer and millimeter waves.

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