High-Power Combline Diplexer for Space

<?Pub Dtl?>A high-power <formula formulatype="inline"><tex Notation="TeX">$L$</tex> </formula>-band combline diplexer to be used in a National Aeronautics and Space Administration/Jet Propulsion Laboratory space mission has been designed and tested for multipaction. The radar path was required to have peak power handling of 450 W with 24.25-W average. The radar filter was partially filled with low-loss dielectric material to protect it against multipaction. The device was tested with input power up to 1800–W peak with no evidence of multipaction while having excellent RF peformance, including less than 0.20-dB insertion loss over temperature.