Virtual prototype of innovative ka-band power amplifier based on waveguide polarizer

This paper outlines an innovative approach to design a spatial power-combining structure based on waveguide polarizers. It presents the 3D CAD model of the new structure with the transversal probes and considerations in positioning and optimization of them. Exploiting the transformation of the dominant input mode TE10 into an elliptically polarized wave, provided by the polarizer, it has been possible to achieve a division of power by eight, completely carried out in space. With the insertion of the transversal probes made by microstrips, the RF signal can be sent to the MMIC solid state power amplifiers, and then recombined in the output section. Thanks to the large number of power divisions made in the waveguide section, the insertion loss of the power divider/combiner is less than 0.5 dB across the 32-34 GHz band, achieving a great power density as well. At the authors’ best knowledge, this is the first work where a waveguide polarizer is used in Spatial Power Combining technology

Small Size, High Power Density, Solid State Amplifiers for Space Application

In this article the new frontier in Spatial Power Amplifiers is shown, with particular attention to the their Space Applications. These amplifiers have in fact the characteristic of High RF Power, Solid State Technology and High Power Density due to the small sizes that can be reached. We will show the performances of three amplifiers employing the spatial combining technique, two prototypes in the X-Band and one in the Ka-Band, with a brief description of the design approach. These amplifiers belong to the Single Waveguide group of the SPC family, thus a WR90 and a WR28 waveguides are employed. Very good performances are obtained from these prototypes, with a very high power density due their small sizes