[asac][almanews]ALMA Memo 432 Released

[Stacy Oliver]

ALMA MEMO #432

A Split-Block Waveguide Directional Coupler

A. R. Kerr and N. Horner
National Radio Astronomy Observatory
Charlottesville, VA 22903, USA

2002/08/26

Keywords: Directional couplers, Waveguide couplers, Millimeter wave directional couplers, Millimeter wave circuits.

A simple waveguide directional coupler is described which uses the split-block type of construction common in millimeter-wave
components.  The coupler uses an array of metal probes suspended on quartz stand-offs.  Depending on the number of coupling
elements, the coupling can be in the range 15-30 dB, with typically ± 2 dB variation across the waveguide band, and directivity  >
10 dB.  The coupler, intended for injecting local oscillator power into a waveguide mixer, can be scaled for operation in any
waveguide band.


View a pdf version of ALMA Memo #432.
http://www.alma.nrao.edu/memos/html-memos/alma432/memo432.pdf

Download a postscript version of ALMA Memo #432.
http://www.alma.nrao.edu/memos/html-memos/alma432/memo432.ps


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