  The possibility of applying stacks of capacitive and inductively coupled and
synchronized Josephson junctions as either high radiation power or wideband
current controlled terahertz modulator is proposed and investigated. The
properties of such modulators, which can be fabricated using the mesa structure
of the layered high-Tc superconductors, are obtained numerically and
analytically in the presence and absence of the external magnetic field with
different vortex lattices. Based on these analyses, the peak frequency
deviation of modulated signal with respect to input signal is calculated.
Typical spectrum of the radiated signal is also obtained in this approach. In
addition, the variation of the peak frequency deviation with respect to carrier
frequency for different magnetic configurations is obtained analytically. The
results for these calculations show carrier frequencies from subtrahertz to
multiterahertz.
