Terahertz coherent oscillator integrated with slot-ring antenna using two resonant tunneling diodes

The development of compact, high-output-power electronic terahertz sources will benefit from coherent combination of power from multiple oscillators. Mutual coupling for power combining and linewidth narrowing generally requires additional, potentially lossy coupling structures that limit array scalability. To address this limitation, two resonant tunneling diode (RTD) oscillators integrated within a single slot-ring antenna are herein proposed. They employ an innate phase-locking mechanism, thereby realizing mutual-coupling and radiation simultaneously. The proposed double-RTD device is experimentally found to demonstrate a single-peak oscillation at 354 GHz with narrow linewidth (2 MHz), higher output power (31 mu W), and linearly polarized, unimodal radiation pattern.

Automated summary

This study proposes integrating two resonant tunneling diode (RTD) oscillators within a single slot-ring antenna, achieving mutual-coupling and radiation simultaneously through an innate phase-locking mechanism. Experimental results show that this double-RTD device exhibits higher output power and excellent performance at 354 GHz.