Appeal No. 1996-3960
Application No. 08/380,444
the wavelength of the lower of the two frequencies. The
antenna
is a semi rigid coaxial waveguide and a one end the waveguide
is shorted. On page 6 of the specification, Appellant
identifies that the shield of the waveguide has slots for high
frequency transmission. On page 6 of the specification,
Appellant identifies that the high frequency output is fed to
the antenna by a coaxial waveguide which is directly connected
to the antenna. On pages 6 and 7 of the specification,
Appellant identifies that the lower frequency is fed to the
antenna by another coaxial waveguide which is connected to the
antenna via a capacitor.
Independent claim 1 is representative of the invention
and reads as follows:
1. An antenna arrangement for transmitting
at least two RF frequencies, comprising:
a waveguide antenna element which is of a
length matched to a fraction of the wavelength
of the lower of said at least two frequencies,
said waveguide antenna element including
an internal conductor and at least a shield
around said internal conductor;
a short circuit means at one end thereof
connecting said internal conductor and said
shield;
2
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