270-GHz Radiator Module for Eight-Way Incoherent Power Combining of InP HBT Oscillators

This article presents a metallic radiator module, 11.5× 5.6× 2.5cm³ in size, designed to direct terahertz power with a 26° circularly symmetric radiation beam. The module combines the power from eight identical integrated oscillator chips in free space using a linear array of built-in circular horns with 17-dB gain. The oscillators operating at unlocked frequencies produce an average power of 3.5 dBm within the 268-274 GHz range. When all elements are activated, the radiator module maintains the same radiation patterns as the individual elements, achieving a total radiated power of 12.5 dBm, which represents an eightfold increase from the average power per element.