Sub-Terahertz Resonant Tunneling Diode Oscillators Integrated with Tapered Slot Antennas for Horizontal Radiation

Abstract

This paper reports on the fabrication and oscillation characteristics of sub-terahertz resonant tunneling diode (RTD) oscillators integrated with tapered slot antennas for horizontal radiation. The device consists of a GaInAs/AlAs RTD and a resonator, waveguide, and tapered slot antenna on a semi-insulating InP substrate. The substrate under the tapered slot antenna was thinned to 20 µm to suppress radiation into the substrate. An oscillation frequency of 405 GHz and horizontal output power of 60 µW were observed at room temperature. A single-peak radiation pattern was obtained in the horizontal and vertical planes. The oscillation frequency, output power, and radiation pattern agreed well with theoretical analysis.

Frequency Limitations of Resonant-Tunnelling Diodes in Sub-THz and THz Oscillators and Detectors

“…4d). This kind of oscillators on a thinned ≈ 20-μm-thick InP substrate operating at 400 GHz has been reported in [62]. The highest frequency achieved with the oscillators is 1.1 THz [9], the oscillators were fabricated on few-μm thick spin-on dielectric membrane in this case.…”

Terahertz oscillators using electron devices - an approach with Resonant tunneling diodes

“…12), because most of the output power is radiated into the substrate due to its large dielectric constant. Lens-free oscillators were also reported [36,37,38]. …”

Terahertz Emitter Using Resonant-Tunneling Diode and Applications

“…For a collimated output beam, a hyper-hemispherical lens is used. Structures without silicon lenses have also been reported [27,28,[62][63][64]. is the NDC of the RTD, is the conductance of the slot antenna, which is composed of the radiation conductance and the conductance due to the Ohmic loss , and and are the inductance and capacitance of the RTD and slot antenna.…”