This memo describes the design of a set of waveguide quadrature hybrids suitable for use in balanced and sideband- separating mixers, balanced amplifiers, and power combiners and dividers. The hybrids are of the branch-line type, which can be machined in a split block configuration on a CNC milling machine. The prototype designs are for the WR-10 band (75 110 GHz), but the dimensions are chosen to allow scaling to any waveguide band up to ~700 GHz. The designs were optimized using a space mapping procedure, with a fast but approximate microwave circuit simulator (MMICAD) and a slower but accurate FDTD EM simulator (QuickWave).
View a PDF version of ALMA Memo #343.Last modified: January 17, 2001
alma-memos@nrao.edu