Appeal No. 1999-1894
Application 08/847,804
which is resonant at 4f . Thus, the antenna portion between
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the bottom feed 23 and subcircuit 29 forms a first radiating
element, the antenna portion between subcircuit 29 and
subcircuit 26 forms a second radiating element, and the
antenna portion from the subcircuit 26 to the top of the
antenna forms a third radiating element. The first radiating
element radiates at the highest frequency 4f , the combination
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of first and second radiating elements radiates at a second
radiating frequency 2f , and the combination of first, second,
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and third radiating elements radiates at a third radiating
frequency f . Fig. 2 shows the length of the first radiating
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element to be 8/4 at 4f . Thus, Fenwick shows the general
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structure of a three-frequency trap monopole antenna.
The differences between the subject matter of claim 9 and
Fenwick are argued to be: (1) "said first radiating element
having a length of less than a quarter wavelength at said
selected resonant frequency"; and (2) "to radiate in a
radiation pattern at said selected resonant frequency having
an absolute gain in the vertical plane between about -3 dBi to
about +4dBi over the elevation angle from about 10E to
about 60E." We note that the radiation pattern of (2) must
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