ALMA Memo #316
Design of a Sideband-Separating Balanced SIS Mixer Based on Waveguide Hybrids

S. M. X. Claude, C. T. Cunningham, A. R. Kerr, and S.-K. Pan
September 2000

We describe a design for a sideband-separating balanced mixer using four planar single-ended mixer chips connected to the feed horn and LO source by a network of quadrature waveguide hybrids and an in-phase waveguide power divider. The mixer has separate IF output ports for the downconverted signals from the upper and lower RF sidebands, and requires ~14 dB less LO power than a single-ended mixer using a 20-dB LO coupler. The design of the mixer is suitable for scaling to ~700 GHz and can be fabricated using CNC machining techniques.

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Last modified: September 27, 2000