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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.
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Last modified: 2002-09-03
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