Communications: radio wave antennas – Antennas – Wave guide type
Reexamination Certificate
2005-11-22
2005-11-22
Nguyen, Hoang V. (Department: 2821)
Communications: radio wave antennas
Antennas
Wave guide type
C343S773000
Reexamination Certificate
active
06967626
ABSTRACT:
A collapsible discone antenna is provided with an ultra wide band width by providing a collapsible conical skeleton cone, with the rods of the skeleton being provided with meander lines so as to effectively reduce the overall dimensions of the antenna by a factor of 2, with the antenna rods being electrically interconnected at their distal ends so as to eliminate performance degradation due to varying ground conductivities. A specialized feed configuration is used in one embodiment to feed multiple antennas stacked above a low band disc through the utilization of one or more coaxial lines which are wrapped around a ferrite toroid so that they may be passed up through the low-band disc without detuning the low band discone antenna. The use of the toroid inductor between the low-band cone and the low-band disc further reduces the low frequency cutoff of the antenna by markedly decreasing the VSWR at frequencies as low as 20 megahertz.
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BAE Systems Information and Electronic Systems Integration Inc.
Long Daniel J.
Nguyen Hoang V.
Tendler Robert K.
Vy Hung Tran
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