Signal router with coupling of multiple waveguide modes for provicing a shaped multi-channel radiation pattern
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United States of America Patent
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Mar 30, 1999
Grant Date -
N/A
app pub date -
May 28, 1997
filing date -
May 28, 1997
priority date (Note) -
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Abstract
A signal router includes a free space region with input and output sides. A number of input and output waveguide arms extend from the respective input and output sides of the free space region. At least a subset of the input or output waveguide arms are configured such that a signal applied to one of the waveguide arms excites multiple modes of that waveguide arm. Coupling between the multiple modes of the various waveguide arms is used to shape a multi-channel output radiation pattern of the router. The excitation of multiple modes may be provided by configuring a given waveguide arm to include a first portion and a second portion, with the second portion arranged between the first portion and a side of the free space region and having a width which is greater than a width of the first portion. Alternatively, the excitation of multiple modes may be provided by including one or more auxiliary waveguide arms between a given pair of main input or output waveguide arms. In either case, a desired multi-channel radiation pattern for a given router may be provided by altering characteristics of the waveguide arms.
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