A system having a transmit path and a receive path coupled to an antenna includes a cryostat, a receive filter disposed in the cryostat, a transmit filter disposed outside of the cryostat and in the transmit path, and a coupler that couples the antenna and the receive filter. The coupler includes a phase-adjusting portion disposed in the cryostat to provide duplexing functionality. The receive path includes the filter and the phase-adjusting portion of the coupler.

 
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