Appeal No. 2003-0191
Application 09/155,278
energy entering any one port being transferred, usually equally,
to two of the three remaining ports.2 A duplexer, in radar
systems, is a device that isolates a receiver from a transmitter
while permitting them to share the same antenna.2 In response to
the appellant’s argument that a duplexer is not a hybrid
polarization coupler (brief, page 4), the examiner argues that
“the duplexer of Runyon is a device designed to allow an antenna
to be used for both transmission and reception of signals
simultaneously. A coupling is a means by which energy is
transferred from one conductive or dielectric medium (optical
waveguide) to another, including fortuitous occurrences. Since
hybrid coupler is defined as a hybrid junction that forms a
directional coupler, it is considered that couplers 80 and 82 act
as a type of first and second hybrid transmission polarization
couplers” (answer, pages 6-7).
Runyon’s items 80 and 82, however, are not couplers but,
rather, are duplexers. Runyon’s discussion of his duplexers 80
and 82 is consistent with the definition of “duplexer” set forth
above. That is, Runyon discloses that 1) duplexers 80 and 82
2 Definitions of “hybrid coupler”, “hybrid junction”,
“directional coupler” and “duplexer” are set forth in the
appellant’s reply brief (page 2).
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