Efficient spatially combined amplifiers for compact Ku-band satellite communication terminals

Spatially combined amplifiers offer advantages in size and efficiency that are unmatched using traditional solid-state combining approaches. We present measured data from a spatially combined Ku-band deck amplifier/sup /spl trade// for use in the 13.75-14.5 GHz satellite uplink band. This amplifier module generates over 45 dBm (31.6 W) of saturated power by spatially combining the outputs of six commercial MMICs with nearly ideal combining efficiency. The power amplifier module occupies less than 12 cubic inches and draws 165 W DC power while delivering 25 W output. We present linearity and spectral regrowth data for this module and demonstrate the flexibility of the deck amplifier architecture with data for a range of module output powers. The high efficiency of these deck amplifier modules enables creation of very compact, lightweight SSPAs and block upconverters capable of being mounted directly on the feed for small aperture satcom applications such as on-the-move and flyaway.