Tunable multi-tone multi-band high-frequency synthesizer for space-borne beacon transmitter for atmospheric radio wave propagation studies

A transmitter comprising:

• an input signal configured to be frequency tuned by a user;
• a pre-amplifier configured to amplify the frequency tuned input signal;
• a frequency comb generator configured to receive the frequency tuned input signal and to simultaneously produce an output signal comprising a coherent evenly spaced comb of radio frequencies with tunable intervals at several frequency bands, wherein the coherent evenly spaced comb of radio frequencies is in at least one of the Q-band, the K-band, and the E-band;
• a power divider configured to receive the evenly spaced comb of radio frequencies and divide the output signal into a plurality of outputs;
• one or more than one tunable bandpass filters configured to select a user-selected band of comb radio frequencies from the plurality of outputs produced by the power divider;
• one or more than one tunable power amplifiers configured to simultaneously amplify the user-selected band of comb radio frequencies;
• and
• one or more than one transmission antennas configured to simultaneously transmit the user-selected band of comb radio frequencies from the one or more than one tunable power amplifiers to one or more than one receiving antenna.