Research on radial power synthesis technology of terahertz gap waveguide

Abstract

In response to the demand for low-loss power synthesizers in the development of terahertz solid-state power amplifiers, a 4-way waveguide radial power synthesizer was developed based on gap waveguide technology in the frequency band of 200-240 GHz. After passive testing, the return loss of the gap waveguide radial synthesizer was better than -15 dB, and the passive synthesis efficiency reached 88.7%, showing the low-loss characteristics of the gap waveguide in the terahertz frequency band. By packaging two GaN power amplifier chips to form a power module as the basic unit, active power synthesis was further carried out, and finally a peak output power of 311 mW was achieved at 220 GHz, and the average power synthesis efficiency was 81% in the frequency range of 200-240 GHz.