Appeal No. 1996-3960
Application No. 08/380,444
frequency is fed by coaxial waveguide 28. The shield of
waveguide 28 is directly connected to antenna element 14. The
center conductor of waveguide 28 is connected through item 21
to antenna element
item 13. See column 3, lines 6 through 15. Thus we find that
the waveguide for the lower frequency is directly coupled to
the antenna item 16. Gilbert’s dielectric, item 15, is an
element of the antenna which couples antenna sub-elements 13
and 14. See column 2, lines 16 through 20. We find that any
capacitance formed as a result of dielectric 15 does not link
the antenna, item 16, to the low frequency waveguide.
Further, we disagree with the Examiner’s assertion, on page 10
of the Answer, that the capacitance between the inner
conductor 29 and the outer shield, items 28 of Gilbert’s
waveguide meets the capacitive coupling
limitation of claims 1 and 3. We find that though Gilbert’s
low frequency coaxial cable may have capacitance between the
two conductors, such capacitance is a feature of the waveguide
and does not couple the waveguide to the antenna. In summary
we find that Gilbert’s antenna and low frequency coaxial feed
may have capacitance, but we do not find that there is
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