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 5GHz, 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.