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A satellite transponder for on-orbit verification of LTCC packaging technology at K-band/S -band is presented. The system up-converts a received signal at 2 GHz to 22 GHz and down-converts to the transmit frequency of 2.2 GHz. We discuss the system concept needed to evaluate K-band LTCC components by means of S -Band signaling. As a proof-of-principle a basic transponder system including some housekeeping electronics is analyzed in terms of conversion characteristic and spectral output.