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At IMS 2011 in Baltimore, K&L Microwave spotlighted a UHF diplexer for space applications. It designed, tested and qualified the diplexer.
The diplexer design utilizes high Q cavities for low loss in the trasmit (TX) and receive (RX) channels. The TX path has been tested for 60 W of power handling from a space-level vacuum through critical attitude (approximately 0.1 to 1 torr) in a Mars gas atmosphere, which requires about 20 percent better power handling than critical altitude in Earth atmosphere. Additionally, the RX channel maintains over 100 dB of TX isolation for supporting the low sensitivity receiver and the passbands have less than 2.0db insertion loss. The design has also been optimized to keep the package as small and ightweight as possible.
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