Reconfigurable ka-band switch matrix for on-orbit verification

We have developed a fully operational remotely controlled reconfigurable microwave switch matrix for applications in upcoming satellite-based multimedia communication systems. The robust and compact modular setup includes appropriate microwave oscillators, power detectors, and diode drivers. The individual modules take full advantage of the low temperature co-fired ceramics technology (LTCC). The experiment will be controlled by a field-programmable gate array (FPGA), to verify, control, and monitor the operation of the switch matrix during an on-orbit verification in a one-year-period following the expected launch in 2010. Present activities aim at a complete space qualification and the timely integration into the payload of the satellite. The switch matrix is laid out for Ka-band frequencies using a single-pole multiple-throw architecture and incorporates integrated PIN-diode switch circuits. We have achieved very promising values for input matching, insertion loss, and path isolation over the entire passband width of 5 GHz, which meet realistic specifications. The electrical control of the switch matrix module is realized by the use of diode drivers, which enable a fully digital control of the path configuration.