ALMA Memo #306

A Dual-Polarization Double Sideband Quasi-Optical System for High Frequency ALMA Receivers

A double sideband receiver using a dual-polarization, dual-beam interferometer for LO diplexing is suggested as a suitable scheme for the high frequency ALMA bands. The bandpass characteristics of the diplexer, including ohmic loss of the grids and mirrors and diraction losses are analyzed. The integrated LO noise present in the signal passband is also determined.

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Last modified: May 10, 2000