On-chip diplexed multi-band submillimeter-wave/terahertz sources

A multiplier or mixer solid-state device, comprising:

• a chip comprising two or more on-chip diplexed frequency multiplying or mixer structures including diodes, transmission lines, chip to waveguide transitions, and a waveguide structure where the multiplying or mixer structures are placed, wherein:
• the structures include on-chip diplexing distributing a broadband input signal, transmitted onto the chip, among the two or more of the multiplier or mixing structures with narrower RF operation bandwidth,
• each of the multiplying or mixer structures comprises two or more diodes and is tuned to work in a certain frequency band, comprising a frequency sub-band of the broadband input signal's frequency band,
• the diodes each comprise at least one anode, one ohmic contact and a semiconductor heterostructure,
• the diodes on each of the structures are balanced in terms of electrical behavior,
• the diodes each generate a higher frequency through frequency-multiplication of the input frequency in the frequency sub-band transmitted to the each of the diodes, or an intermediate frequency through frequency mixing of two input frequencies in the frequency sub-band transmitted to the each of the diodes,
• each of the signals generated in the diodes of one of the multiplying or mixing structures are electrically combined to form an output signal comprising a combined output frequency band,
• each of the output signals generated in each of the multiplying or mixing structures can be coupled to the same or different output waveguide(s) using output E-probes located on each of the structures radiating directly to the same or different output waveguide(s), and
• each of the two or more multiplying structures work at a different one of the frequency sub-bands within the input signal's frequency band, so that the input signal is automatically divided into the two or more multiplying structures without the need of additional waveguide based diplexers.