Communications-on-the-move with the grid amplifier: spatially combined power amplifiers can enable smaller, more mobile terminals

This paper describes the benefits of using grid amplifiers and their suitability for communications-on-the-move (COTM) terminals. By spatially combining the outputs of many solid-state devices on a single chip, grid amplifiers are not only powerful, linear, and efficient, but also are compact, rugged, and robust. We present measured data from a fully-packaged Ka-band module with standard waveguide input and output flanges. The module produces over 12 W from a single output-stage chip. DC power consumption is 56 W quiescent and less than 65 W at 10 W RF output. We also present data detailing the module´s linearity, temperature dependence, and build uniformity. The module is compact and lightweight, potentially enabling the SSPA to be mounted on the gimbal of high-speed tracking antennas needed for COTM. Further, the low module cost will promote widespread adoption of COTM.