Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Reexamination Certificate
2009-05-06
2011-12-20
Phan, Tho G (Department: 2821)
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
C343S791000
Reexamination Certificate
active
08081130
ABSTRACT:
A shortened multi-band antenna includes in-line dipoles, selected elements of which having shielded meanderline chokes to be able to switch from an extended dipole at the lower VHF frequencies to a shortened dipole for the UHF band. Additionally, the staggered asymmetric meanderline configuration permits overall size reduction, whereas antenna construction includes an intermediate fiberglass layer over which conductive foil is placed for tuning and for parasitic radiator purposes to improve the gain of the UHF dipole in the upper regions of the band at 450 megahertz. Additionally, at the low end of the 30 megahertz band a sleeve is positioned between the base of the lowest dipole element and ground, with the sleeve provided with two parallel RLC circuits tuned to different bands to improve VSWR at the low end of the VHF band and to eliminate unwanted nulls.
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Apostolos John T.
Feng Judy
Mouyos William
BAE Systems Information and Electronic Systems Integration Inc.
Long Daniel J.
Phan Tho G
Tendler Robert K.
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