[asac] [almanews] ALMA Memo No. 343 Released

[Carolyn White]

ALMA Memo #343

Waveguide Quadrature Hybrids for ALMA Receivers

S. Srikanth and A. R. Kerr
January 11, 2001

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.
     http://www.alma.nrao.edu/memos/html-memos/alma343/memo343.pdf

Download a postscript version of ALMA Memo #343. 
     http://www.alma.nrao.edu/memos/html-memos/alma343/memo343.ps
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